In recent years, the valve casting industry in China into a period of rapid development, has now become Asia's largest valve castings machining center and one of the world's largest valve casting market, especially in the power station valve, chemical valve, the valve and the rise of building materials and food with valve, due to its broad prospects for development, the market attractive profits, at present many enterprise investment to become hot property.
Although broad prospects, but at present the valve casting products per capita consumption level is not high in the world, the valve casting industry belongs to the sunrise industry, has now become and steel valves, cement, wood based materials industry sectors such as neck and neck, eyes of the nation's entrepreneurs, investors, investment casting valve industry, believe that will be suitable timing, right place.
Jin Mo investment network, chief analyst at luo hundred hui, however, pointed out that investment valve casting industry has been a rising tide lifts all boats "threshold", as the related industrial field is plural, longitudinal deepening development trend, the identity of the valve castings products has gradually from commodities leading to a broader expansion of the industry, new and high technology puts forward higher requirement on valve products, at the same time all kinds of scrap valve products task processing of environmental protection, recycling and reuse, will become more difficult.
Saturday, April 27, 2013
The best high-quality valve products and services are provided for LNG project
General manager of China, Shengbolai Valve Co., said Zhuo Guizhao, as one of China's largest special valve, ball valves, cryogenic valves professional R & D and manufacturers, the company has 10 years of experience in R & D and manufacturing, with its focus on the special valve to improve the harsh industrial environment of manufacturing capacity and innovation capability, in order to can last constantly producing industrial valve has the world's advanced level of responsibility. The company's goal is to solve the problems of the industry users, provide the total solution for all kinds of terminal user system, striving to become a world-class valve synchronized with the world brand manufacturing enterprises.
Shengbolai Valve Co., Ltd. is headquartered in Shanghai, has 3 production bases, which are located in Shanghai Jinshan, Shanghai Baoshan, Suzhou. China safety valves are widely used in the production of high quality and bad mining such as: high temperature (up to 1500 ℉), high voltage (Class4500), super low temperature (-272 ℃), high particle
Zhuo Guizhao said, the utilization of LNG in China is uneven, the proportion of natural gas in China's energy market is very small, in the continuous development of China's economy and the growing demand for energy, the introduction of LNG to China to solve energy structure optimization, the security of energy supply, ecological environment protection, has an important role in realizing the sustainable development of economy and society. Can be expected in the next 5-10 years LNG will become the main force of China's energy market.
Shengbolai Valve Co., Ltd. is headquartered in Shanghai, has 3 production bases, which are located in Shanghai Jinshan, Shanghai Baoshan, Suzhou. China safety valves are widely used in the production of high quality and bad mining such as: high temperature (up to 1500 ℉), high voltage (Class4500), super low temperature (-272 ℃), high particle
Zhuo Guizhao said, the utilization of LNG in China is uneven, the proportion of natural gas in China's energy market is very small, in the continuous development of China's economy and the growing demand for energy, the introduction of LNG to China to solve energy structure optimization, the security of energy supply, ecological environment protection, has an important role in realizing the sustainable development of economy and society. Can be expected in the next 5-10 years LNG will become the main force of China's energy market.
Friday, April 26, 2013
Owing to four faulty valves AERB has decided to delay Kudankulam nuclear power plant
India's nuclear regulator ordered
replacement of four defective plug valves of the system that cools the
reactor of Kudankulam nuclear power plant after the problem was detected
during ongoing pre-commissioning tests.
The defect in the components of the four valves - there are thousands of such devices in a nuclear reactor - was found during pre-commissioning tests early this year, officials said.
"During testing of thousands of indian butterfly valves installed in the plant, the performances of four valves of a particular type were found deficient," R Bhattacharya, Secretary, Atomic Energy Regulatory Board (AERB) said in a statement here Friday evening.
Officials said that the butterfly valves were in the Emergency Core Cooling System (ECCS) that removes heat from a nuclear reactor under extreme components. On finding the defective valves, the Nuclear Power Corporation of India Limited (NPCIL) had procured replacements through its Russian collaborators.
"These valves are requiring larger efforts to get corrected," another official said but added that this was not an unprecedented development.
AERB Chairman S.S. Bajaj said the new components have been procured and were being assembled.
The programme 'requires formulation of detailed quality assurance plans specifying the sequence of activities and identifying the quality control points at which physical inspection/verifications are performed by the Quality Assurance Groups of contractors/manufacturers as well as independently by NPCIL'.
It added that the AERB had cleared for an 'initial fuel loading' at the plant as part of the commissioning activities and that "satisfactory demonstrations of functional capability are a prerequisite for considering the plant suitable for operating phase."
The defect in the components of the four valves - there are thousands of such devices in a nuclear reactor - was found during pre-commissioning tests early this year, officials said.
"During testing of thousands of indian butterfly valves installed in the plant, the performances of four valves of a particular type were found deficient," R Bhattacharya, Secretary, Atomic Energy Regulatory Board (AERB) said in a statement here Friday evening.
Officials said that the butterfly valves were in the Emergency Core Cooling System (ECCS) that removes heat from a nuclear reactor under extreme components. On finding the defective valves, the Nuclear Power Corporation of India Limited (NPCIL) had procured replacements through its Russian collaborators.
"These valves are requiring larger efforts to get corrected," another official said but added that this was not an unprecedented development.
AERB Chairman S.S. Bajaj said the new components have been procured and were being assembled.
The programme 'requires formulation of detailed quality assurance plans specifying the sequence of activities and identifying the quality control points at which physical inspection/verifications are performed by the Quality Assurance Groups of contractors/manufacturers as well as independently by NPCIL'.
It added that the AERB had cleared for an 'initial fuel loading' at the plant as part of the commissioning activities and that "satisfactory demonstrations of functional capability are a prerequisite for considering the plant suitable for operating phase."
Thursday, April 25, 2013
Hale safety valve are designed to regulate pressure whether on outflow setting or an intake
Hale safety valve designed to stress safety maintenance, consistent in the total pressure of the system active. Relief valve to adjust the pressure in an air intake or outflow settings, automatic and immediate locking function, when the pressure reaches or exceeds the normal level. Valve installed in the total pressure of a variety of systems, fire and oil sump pump, and maintain the product must remain a priority. Consult a professional Haier products represent additional information and inquiries orders and the installation of a pressure system and / or safety valve.
1. To observe the overall design. Flanged Safety Valves structure corrosion resistance of bronze and manufacturing in a butterfly style. Butterfly valve vertical thin rotating disk in two connected nodes. Provide valve pressure in a single line of the disk to rotate in a direction based on.
2. Check list. The valve must be read in 75 years and 250 years among psi. Hale all safety valve was originally arranged before the 125 psi sisters and any external pressure system.
3. Rotating the handwheel. Hale safety valves -- or knob -- fully open or close any pressure system, the largest of the 10 full rotation.
1. To observe the overall design. Flanged Safety Valves structure corrosion resistance of bronze and manufacturing in a butterfly style. Butterfly valve vertical thin rotating disk in two connected nodes. Provide valve pressure in a single line of the disk to rotate in a direction based on.
2. Check list. The valve must be read in 75 years and 250 years among psi. Hale all safety valve was originally arranged before the 125 psi sisters and any external pressure system.
3. Rotating the handwheel. Hale safety valves -- or knob -- fully open or close any pressure system, the largest of the 10 full rotation.
Wednesday, April 24, 2013
Boehner Svea valve won the bidding of national south-to-north water transfer project
At the beginning of 2012 12, Bona Swee Valve Co., the company received the Xinxiang city supporting South-North Water Diversion Project Construction Authority won the bid notice, valves and ancillary equipment procurement projects in the national major project of the South-to-North Water Diversion Project bidding, Bona Swee valve limited company with its good product quality and excellent quality reputation, many competitors in the API Gate Valves in one fell swoop, talent showing itself and the successful bidder, pipe valve the bid procurement of large orders, the total contract amount of about 17270000 yuan, this marks the Bona Swee Valve Co., Ltd. officially in the national major project -- the South-to-North Water Diversion Project and ancillary equipment procurement projects, this is also Bona Swee Valve Co. Ltd. won a big order in sales, the greater is their companies adhere to the quality first, and strive to build quality fruit.
It is reported, this big orders is the Wang Ronghui of this company general manager, sales manager Wang Tingmeng, chief engineer Hu Junchao and the technology sector effort, but also their long-term tracking achieved an important order. Next, to coordinate the work of company will do well this big orders, quality and quantity, try to finish this big order delivery, to make satisfaction for the South-to-North Water Transfer Project terminal user answer.
It is understood, bonasiwei valves Co., Ltd is currently the main production and manufacturing all kinds of products, after just a few years time, the company realized the primitive accumulation of capital, and entered the great-leap-forward development, throughout the country has set up a few branches, has a staff of more than 500 people, engineering and technical personnel nearly 100 people achievement, is China Chemical Equipment Corporation sentinel production enterprises, Tianjin city famous brand etc.. They use the valve products in the energy-saving, environmental advantages, to become China's "king of butterfly, butterfly valve" to do the fine, refine on, walk in the forefront counterparts!
It is reported, this big orders is the Wang Ronghui of this company general manager, sales manager Wang Tingmeng, chief engineer Hu Junchao and the technology sector effort, but also their long-term tracking achieved an important order. Next, to coordinate the work of company will do well this big orders, quality and quantity, try to finish this big order delivery, to make satisfaction for the South-to-North Water Transfer Project terminal user answer.
It is understood, bonasiwei valves Co., Ltd is currently the main production and manufacturing all kinds of products, after just a few years time, the company realized the primitive accumulation of capital, and entered the great-leap-forward development, throughout the country has set up a few branches, has a staff of more than 500 people, engineering and technical personnel nearly 100 people achievement, is China Chemical Equipment Corporation sentinel production enterprises, Tianjin city famous brand etc.. They use the valve products in the energy-saving, environmental advantages, to become China's "king of butterfly, butterfly valve" to do the fine, refine on, walk in the forefront counterparts!
Tuesday, April 23, 2013
Selected electric butterfly valves with generous appearance and small size
In the electric ball valves and electric control valve in a species. Connection mode mainly has: flange type and clamp. Is an important executive unit in the field of industrial automation control. Belonging to the electric valve and electric control valve in a species.
Jiangsu GAODA Valve Co. Ltd. located in China Town - Yixing Gaocheng environmental protection. The company is committed to "up to" brand valve series product research and development, manufacturing, sales, technical services and personnel training. The main products are produced according to GB, API, JIS, DIN, BS and other standard butterfly valve, ball valve, slurry valve, diaphragm valve, check valve, hydraulic control valve and other special valves more than 1000 kinds of specifications, the main material can be made of cast iron, WCB, CF8, CF8M, CF3, CF3M, pressure is adjustable from 0.6 to 4.0MPa; the path from DN15 to DN1600mm; can use manual, worm gear, pneumatic, electric and other drive mode; working temperature from -196 ℃ to 700 ℃.
Up to the company for a better service in the power plant, refinery, chemical industry, metallurgy, papermaking, shipbuilding, medicine, municipal and high-rise buildings and other areas of the client strictly in accordance with the ISO9001 international quality assurance system, and constantly adopting new technologies, new processes, new materials, and actively develop new products, to provide the new valve products and the best service for all walks of life.
Jiangsu GAODA Valve Co. Ltd. located in China Town - Yixing Gaocheng environmental protection. The company is committed to "up to" brand valve series product research and development, manufacturing, sales, technical services and personnel training. The main products are produced according to GB, API, JIS, DIN, BS and other standard butterfly valve, ball valve, slurry valve, diaphragm valve, check valve, hydraulic control valve and other special valves more than 1000 kinds of specifications, the main material can be made of cast iron, WCB, CF8, CF8M, CF3, CF3M, pressure is adjustable from 0.6 to 4.0MPa; the path from DN15 to DN1600mm; can use manual, worm gear, pneumatic, electric and other drive mode; working temperature from -196 ℃ to 700 ℃.
Up to the company for a better service in the power plant, refinery, chemical industry, metallurgy, papermaking, shipbuilding, medicine, municipal and high-rise buildings and other areas of the client strictly in accordance with the ISO9001 international quality assurance system, and constantly adopting new technologies, new processes, new materials, and actively develop new products, to provide the new valve products and the best service for all walks of life.
Monday, April 22, 2013
The hydraulic valve device precision & advantages and disadvantages
Appearance of Pneumatic Butterfly Valves, the main difference is that they rely on the power source of the drive. Hydraulic valve stand hydraulic power source, the higher oil pressure to push the piston to drive the valve switch. The precision requirements of the hydraulic actuator is very high, a little a bit processing undeserved cause hydraulic oil leak, the oil cylinder is likely to be scrapped. Is the cause of hydraulic pneumatic valve price is expensive. Hydraulic valve output torque relative to the pneumatic valve, power is strong. Hydraulic valves are widely used in water, steam, water, paper, petrochemical, natural gas, solution and pulp two-phase mixed flow medium, and the dust and gas, powder conveying solid medium containing particles fluid is the ideal equipment, using the hydraulic operation, is more convenient for management automation, remote control, hydraulic signal device, can be used for automation and centralized control.
Hydraulic device is made of hydraulic pressure valves to regulate the opening and closing or drive it by control, motivation and actuators are composed of three parts. Control part consists of a pressure control valve, flow control valves, directional control valves and electric control system composition. Drive by the motor or pneumatic motor, hydraulic pump, tank and so on, is the effective power on the electric or pneumatic motor axis into hydraulic transmission fluid pressure can. Actuator has two kinds, one kind is hydraulic cylinder actuators, realize reciprocating linear motion; The other is a hydraulic motor actuators, realize the rotary motion, the advantages and disadvantages of hydraulic device is as follows:
A, hydraulic valve device
1) the simple and compact structure, small volume;
2) is stable and reliable;
3) can get a lot of output torque;
4) the output torque can be accurately by constant pressure relief valve adjustment, including the opening and closing torque adjustment, even can be reflected directly by hydraulic pressure instrument;
5) easy speed regulation;
6) in power, the sudden accident, still can use accumulator to one or several power operation. The long distance pipeline emergency shut-off valve and wellhead discharge automatically
Valve has a special meaning.
Second, the hydraulic valve gear faults
1) the oil temperature is greatly influenced by environmental temperature, the oil temperature change caused by oil viscosity changes, affect the operation;
2) piping trouble, easy to produce leakage;
3) is not suitable for the signal to produce a variety of operations (such as signal amplification, memory, logic, arithmetic).
Hydraulic device is made of hydraulic pressure valves to regulate the opening and closing or drive it by control, motivation and actuators are composed of three parts. Control part consists of a pressure control valve, flow control valves, directional control valves and electric control system composition. Drive by the motor or pneumatic motor, hydraulic pump, tank and so on, is the effective power on the electric or pneumatic motor axis into hydraulic transmission fluid pressure can. Actuator has two kinds, one kind is hydraulic cylinder actuators, realize reciprocating linear motion; The other is a hydraulic motor actuators, realize the rotary motion, the advantages and disadvantages of hydraulic device is as follows:
A, hydraulic valve device
1) the simple and compact structure, small volume;
2) is stable and reliable;
3) can get a lot of output torque;
4) the output torque can be accurately by constant pressure relief valve adjustment, including the opening and closing torque adjustment, even can be reflected directly by hydraulic pressure instrument;
5) easy speed regulation;
6) in power, the sudden accident, still can use accumulator to one or several power operation. The long distance pipeline emergency shut-off valve and wellhead discharge automatically
Valve has a special meaning.
Second, the hydraulic valve gear faults
1) the oil temperature is greatly influenced by environmental temperature, the oil temperature change caused by oil viscosity changes, affect the operation;
2) piping trouble, easy to produce leakage;
3) is not suitable for the signal to produce a variety of operations (such as signal amplification, memory, logic, arithmetic).
Forged steel valves with the following considerations
Forged steel valve often overlooked issue of the amount of grease. Grease gun refueling, operators of low-temperature valve selection valve and grease coupling method, the grease job. There are two forged steel gate valve situation: on the one hand, less fat less grease, sealing surface accelerated wear due to lack of lubricant. On the other hand, excessive grease, resulting in waste. That there is no according to valve type category, the valve sealing capacity of different calculations. Can be calculated valve size and type of seal capacity, and then injected into a reasonable amount of grease.
Forged steel gate valve pressure often overlooked. Operation in the grease, the grease pressure regulated half free floating ball type steam drain valve of a peak and valley changes. Low pressure safety valve, seal leakage or failure, the pressure is too high, the injection port valve manufacturer blocked, the lipid hardening seal or sealing ring and the valve ball, valve plate locking. Resin injection pressure is usually too low, grease into the valve chamber over the bottom, generally occurs in a small gate. The grease flow control valve pressure is too high, hand check insulation valve check greasing the mouth, such as lipid remote control float valve hole blocking satisfied feeling spring closed with a condition for replacing the spanner; another plunger valve is a lipid hardening, to use the cleaning fluid, repeated failure to soften the seal fat, and injection new grease replacement. In addition, the seal type and sealing materials, also affected the grease seal pressure, different forms have different injection pressure, in general, hard sealing grease injection pressure is higher than the soft seal.
Forged steel globe valve the valve in the switch attention to a problem. Ball valve maintenance in the open position when the general state, under special circumstances, choose to close. All other valves can not be punished in order to open spaces. Forged steel valve in the conservation must be in a closed state, to ensure that the grease seal along the trenches filled with ring, if the open position, sealing grease flow directly into the cavity or valve, resulting in waste. The valve greasing, the grease effect often ignore the problem. Operation pressure grease, grease, the switch position are normal. But to ensure that the valve greasing effect, and sometimes need to open or close the valve, lubricating effect on the inspection, confirmed that the ball valve or gate surface lubrication uniform.
Forged steel check valve should pay attention to problem of pressure relief valve and a plug of sewage. Pressure test valve, gas valve chamber sealed chamber and the water temperature rises due to step-up, when to conduct the sewage grease relief, in order to facilitate the smooth progress of the grease. Grease the sealing cavity was full of air and water replacement. Timely relief valve chamber pressure drop, and guarantee the safe use of the valve. After greasing, be sure to tighten the wire blocking the sewage and pressure relief, to prevent the accident. Grease, fat even pay attention to the problem. Normal greasing, the grease away from the nearest exit out of holes in first out fat and grease, and then to the low end is the high point, successive, fat. If not by law or not fat, prove the existence of plug, Qingtong processing.
Forged steel gate valve pressure often overlooked. Operation in the grease, the grease pressure regulated half free floating ball type steam drain valve of a peak and valley changes. Low pressure safety valve, seal leakage or failure, the pressure is too high, the injection port valve manufacturer blocked, the lipid hardening seal or sealing ring and the valve ball, valve plate locking. Resin injection pressure is usually too low, grease into the valve chamber over the bottom, generally occurs in a small gate. The grease flow control valve pressure is too high, hand check insulation valve check greasing the mouth, such as lipid remote control float valve hole blocking satisfied feeling spring closed with a condition for replacing the spanner; another plunger valve is a lipid hardening, to use the cleaning fluid, repeated failure to soften the seal fat, and injection new grease replacement. In addition, the seal type and sealing materials, also affected the grease seal pressure, different forms have different injection pressure, in general, hard sealing grease injection pressure is higher than the soft seal.
Forged steel globe valve the valve in the switch attention to a problem. Ball valve maintenance in the open position when the general state, under special circumstances, choose to close. All other valves can not be punished in order to open spaces. Forged steel valve in the conservation must be in a closed state, to ensure that the grease seal along the trenches filled with ring, if the open position, sealing grease flow directly into the cavity or valve, resulting in waste. The valve greasing, the grease effect often ignore the problem. Operation pressure grease, grease, the switch position are normal. But to ensure that the valve greasing effect, and sometimes need to open or close the valve, lubricating effect on the inspection, confirmed that the ball valve or gate surface lubrication uniform.
Forged steel check valve should pay attention to problem of pressure relief valve and a plug of sewage. Pressure test valve, gas valve chamber sealed chamber and the water temperature rises due to step-up, when to conduct the sewage grease relief, in order to facilitate the smooth progress of the grease. Grease the sealing cavity was full of air and water replacement. Timely relief valve chamber pressure drop, and guarantee the safe use of the valve. After greasing, be sure to tighten the wire blocking the sewage and pressure relief, to prevent the accident. Grease, fat even pay attention to the problem. Normal greasing, the grease away from the nearest exit out of holes in first out fat and grease, and then to the low end is the high point, successive, fat. If not by law or not fat, prove the existence of plug, Qingtong processing.
The structure characteristics and principle of flange three eccentric multi-level hard seal butterfly valve
1 flange three eccentric hard-seal butterfly valve multi-level product can be applied in the petrochemical industry, food, pharmaceutical, textile, paper, electricity, sewage treatment, water supply and drainage and smelting and other industrial piping. Available in a variety of gases, liquid, semiliquid and micro-pmethodsicles powder pipelines or containers as the control media organizations to open and close the flow. Flange three eccentric multi-level hard-sealed butterfly valve can be installed in any position.
2 flange Butterfly Valves series, has a certain self-cleaning capacity, used in steel works, municipal pipelines, sewage pipes can show a variety of advantages, without maintenance, and good sealing performance, convenient operation.
And
1 flange three eccentric multi-level hard-sealed butterfly valve is the biggest difference with other: use three eccentric structure design. The design of the installation disc center and the center of rotation rigorous eccentricity. When the valve is opened at 10 ℃ and fully open, the sealing surface of the valve seat and valve disc is in a non-contact state, and closed the butterfly plate with the stem and the valve seat sealing surface deflection swing into the closed. The process for opening and closing of small, no wear and prolong the service life of the valve.
2 butterfly valve seat adopts embedded O rubber ring or fluorine plastic sealing pad and combined seals. Therefore, the temperature and wear self-compensation and other functions, to ensure that the valve is closed without leakage.
3 when the valve seat sealing pipeline fluid pressure incoming letter slot, because the Posson's component action principle, make joint seals in the pipeline pressure and O ring expansion force is generated, the valve seat sealing surface squeezed to the butterfly plate and the valve seal. Increasing this unique seal structure with the line pressure can produce greater sealing force.
4 the butterfly valve seat can fine tune. In the use of a certain number of years after the valve, when the sealing ring to wear appears leakage, can not open the valve in case, by the adjusting screw to seal to the butterfly plate direction tuning to press ring sizes needed, you can get the same compensation and sealing performance of the valve is the new.
5 flange three eccentric hard-seal butterfly valve multi-level series except with manual device, can be equipped with pneumatic or electronic device manual butterfly valve, pneumatic butterfly valve (can be attached to the feedback signal and equipped with electro-pneumatic valve positioner) and electric butterfly valve three kinds of six series products.
2 flange Butterfly Valves series, has a certain self-cleaning capacity, used in steel works, municipal pipelines, sewage pipes can show a variety of advantages, without maintenance, and good sealing performance, convenient operation.
And
1 flange three eccentric multi-level hard-sealed butterfly valve is the biggest difference with other: use three eccentric structure design. The design of the installation disc center and the center of rotation rigorous eccentricity. When the valve is opened at 10 ℃ and fully open, the sealing surface of the valve seat and valve disc is in a non-contact state, and closed the butterfly plate with the stem and the valve seat sealing surface deflection swing into the closed. The process for opening and closing of small, no wear and prolong the service life of the valve.
2 butterfly valve seat adopts embedded O rubber ring or fluorine plastic sealing pad and combined seals. Therefore, the temperature and wear self-compensation and other functions, to ensure that the valve is closed without leakage.
3 when the valve seat sealing pipeline fluid pressure incoming letter slot, because the Posson's component action principle, make joint seals in the pipeline pressure and O ring expansion force is generated, the valve seat sealing surface squeezed to the butterfly plate and the valve seal. Increasing this unique seal structure with the line pressure can produce greater sealing force.
4 the butterfly valve seat can fine tune. In the use of a certain number of years after the valve, when the sealing ring to wear appears leakage, can not open the valve in case, by the adjusting screw to seal to the butterfly plate direction tuning to press ring sizes needed, you can get the same compensation and sealing performance of the valve is the new.
5 flange three eccentric hard-seal butterfly valve multi-level series except with manual device, can be equipped with pneumatic or electronic device manual butterfly valve, pneumatic butterfly valve (can be attached to the feedback signal and equipped with electro-pneumatic valve positioner) and electric butterfly valve three kinds of six series products.
Sunday, April 21, 2013
Flowserve valve can perform specific functions and represents comprehensive lines in the industry
On behalf of the Flowserve China Gate Valves provides one of the most complete line in the industry. Our valves can be custom designed to perform a specific function, for our customers unique flow control environment.
Flowserve valve for the most serious and the requirements of the industry, including the corrosion of high level, extremes of temperature and pressure, zero emissions and nuclear power plant.
By the strong engineering and global support, Flowserve provides valve design, help customers to maintain production goals and maintain facilities operating at peak efficiency.
Emerging economies in non-OECD countries will continue to expand at a historic high, if temporarily reduced, speed. Their request is issued major engineering, design, production, and supply chain obstacles for large equipment and higher performance rating, need special expertise and a lot of innovation.
One of several major obstacles facing the valve industry is the engineering application of professional knowledge steadily decreased throughout the industry -- from manufacturer to contractors and end users of plants. Training new cadres of the flow control engineers and technicians to specify and maintain the equipment will be needed in addition to the new professional software and programs, allowing the user to correct the valve technology, application effectiveness and the specified device despite their lack of experience.
Flowserve valve for the most serious and the requirements of the industry, including the corrosion of high level, extremes of temperature and pressure, zero emissions and nuclear power plant.
By the strong engineering and global support, Flowserve provides valve design, help customers to maintain production goals and maintain facilities operating at peak efficiency.
Emerging economies in non-OECD countries will continue to expand at a historic high, if temporarily reduced, speed. Their request is issued major engineering, design, production, and supply chain obstacles for large equipment and higher performance rating, need special expertise and a lot of innovation.
One of several major obstacles facing the valve industry is the engineering application of professional knowledge steadily decreased throughout the industry -- from manufacturer to contractors and end users of plants. Training new cadres of the flow control engineers and technicians to specify and maintain the equipment will be needed in addition to the new professional software and programs, allowing the user to correct the valve technology, application effectiveness and the specified device despite their lack of experience.
Friday, April 19, 2013
Festo introduced MS9-SV safety valves which offer many features
Festo today introduced the MS6-SV and MS9-SV safety valves. These
safety valves offer many features, including compact size, soft start
functionality, and advantageous price versus performance ratio. The
MS6-SV is available in Performance Level c and e units; the MS9-SV is
available in a Performance Level c unit.
Both the MS6-SV and MS9-SV have integrated soft start and exhaust functions in a compact unified body. OEMs and end users have the flexibility of mounting these safety valves as stand-alone units or as a component of the modular Festo MS air preparation system.
The MS6-SV-E series is certified to the DIN ISO 13849-1 safety standard – category 4, performance level e. This valve has an extremely high exhaust rate for its size – 9,000 l/min from P2 to P3. The valve delivers continuous testing and sensing of the safety function.
The MS6-SV-E-ASIS valve option has an integrated network connection to AS-Interface Safety at Work, which eliminates the need for an additional safety relay. The ASIS valve option includes switching status sensing and diagnostic functions. The input and output pressures P1 and P2 are internally monitored and can be read via the AS-Interface bus.
Both the MS6-SV and MS9-SV have integrated soft start and exhaust functions in a compact unified body. OEMs and end users have the flexibility of mounting these safety valves as stand-alone units or as a component of the modular Festo MS air preparation system.
The MS6-SV-E series is certified to the DIN ISO 13849-1 safety standard – category 4, performance level e. This valve has an extremely high exhaust rate for its size – 9,000 l/min from P2 to P3. The valve delivers continuous testing and sensing of the safety function.
The MS6-SV-E-ASIS valve option has an integrated network connection to AS-Interface Safety at Work, which eliminates the need for an additional safety relay. The ASIS valve option includes switching status sensing and diagnostic functions. The input and output pressures P1 and P2 are internally monitored and can be read via the AS-Interface bus.
Thursday, April 18, 2013
There are many of advantages of Seamless Steel Pipes
The largest benefit to using seamless steel pipe is the increased pressure ratings. When steel pipe is rolled and welded, the weakest point in the pipe is the welded seam. A seamless steel pipe does not have a seam, so the tensile strength is uniform around the entire circumference of the pipe. Steel pipe has nominal pressure ratings that are based on the tensile strength of the alloy (mixture of metals) and the wall thickness of the pipe. Using seamless pipe is more expensive but allows for smaller wall thicknesses and pipe weight, which can affect design and costs.
Because seamless steel pipe is a continuous extrusion of the alloy, it takes advantage of true roundness of the circumference. Welded seam pipe invariably is not as round in the cross sectional area as a seamless steel pipe because the welded pipe is wrapped around another form before welding. The welding adds heat, and the equipment adds stress to hold the pipe together. This process introduces variables that allow for warping of the roundness. Seamless pipe maintains the round cross-section, which is important during installation and the addition of pipe fittings.
Although seamless pipe is the most expensive steel pipe, it is the most reliable with the fewest failure points. Because of this, pressure calculations are easier to perform because the weld quality is taken out of the equation. Another advantage to using seamless steel pipe is its strength under loading. Empty pipe has a certain weight that must be supported over long spans. When that pipe begins transporting material, the weight of the material must also be taken into account. Seamless steel pipe has strength benefits compared with welded pipe. Most pipe failures and leaks take place at the welded seam.
Because seamless steel pipe is a continuous extrusion of the alloy, it takes advantage of true roundness of the circumference. Welded seam pipe invariably is not as round in the cross sectional area as a seamless steel pipe because the welded pipe is wrapped around another form before welding. The welding adds heat, and the equipment adds stress to hold the pipe together. This process introduces variables that allow for warping of the roundness. Seamless pipe maintains the round cross-section, which is important during installation and the addition of pipe fittings.
Although seamless pipe is the most expensive steel pipe, it is the most reliable with the fewest failure points. Because of this, pressure calculations are easier to perform because the weld quality is taken out of the equation. Another advantage to using seamless steel pipe is its strength under loading. Empty pipe has a certain weight that must be supported over long spans. When that pipe begins transporting material, the weight of the material must also be taken into account. Seamless steel pipe has strength benefits compared with welded pipe. Most pipe failures and leaks take place at the welded seam.
How to remove and replace Delta Ball Valves
Many of Delta’s single-handle faucets contain a ball valve assembly. In this type of faucet, one handle controls both the temperature and flow of water from the faucet. Inside the faucet body, springs and valve seats support a metal ball and allow it to rotate in the turn direction of the handle. Over time, the springs and seats, and eventually the metal ball itself, can wear and cause leaking from the faucet. Repairing a Delta ball valve faucet requires replacement of the defective parts.
1. Remove the faucet cap and cam packing. The faucet cap is a chrome piece that covers and protects the inside parts. To remove, loosen the white plastic adjusting ring by placing a flat-head screwdriver in one of the four notches and tapping in a counterclockwise direction. Then, unscrew the faucet cap. If the cap will not budge, use a jar opener to provide extra gripping power. Lift off the white plastic cam-packing piece to expose the ball valve. Clean any hard water deposits from the piece by wiping it with a soft cloth dipped in a little lime scale remover.
2. Remove and replace the ball valve and seal/spring combinations. Grasp the ball valve stem and lift up. Inspect the underside of the ball for signs of wear. Signs you need to replace the ball include wearing of the metal around the holes, scratches, or a brass color appearing from underneath the metal plating. Remove and replace seals and springs. Use a flat-head screwdriver to pry out the three spring/seal combinations and discard. Slide a spring onto the open end of each rubber seal and then reinsert in the faucet body, using your finger to push them into place.
3. Reassemble the faucet. Replace parts in this order: the new ball valve, cam-packing piece, faucet cap, handle, and cover plate. Turn the water back on and test the faucet for leaks. If leaking occurs, remove the faucet handle and tighten the adjusting ring.
1. Remove the faucet cap and cam packing. The faucet cap is a chrome piece that covers and protects the inside parts. To remove, loosen the white plastic adjusting ring by placing a flat-head screwdriver in one of the four notches and tapping in a counterclockwise direction. Then, unscrew the faucet cap. If the cap will not budge, use a jar opener to provide extra gripping power. Lift off the white plastic cam-packing piece to expose the ball valve. Clean any hard water deposits from the piece by wiping it with a soft cloth dipped in a little lime scale remover.
2. Remove and replace the ball valve and seal/spring combinations. Grasp the ball valve stem and lift up. Inspect the underside of the ball for signs of wear. Signs you need to replace the ball include wearing of the metal around the holes, scratches, or a brass color appearing from underneath the metal plating. Remove and replace seals and springs. Use a flat-head screwdriver to pry out the three spring/seal combinations and discard. Slide a spring onto the open end of each rubber seal and then reinsert in the faucet body, using your finger to push them into place.
3. Reassemble the faucet. Replace parts in this order: the new ball valve, cam-packing piece, faucet cap, handle, and cover plate. Turn the water back on and test the faucet for leaks. If leaking occurs, remove the faucet handle and tighten the adjusting ring.
Wednesday, April 17, 2013
The problem's cause and characteristics of bellows globe valves
Bellows globe valves are usually referred to as "for the diaphragm valve, valve is a relatively new category, it has its own structure unique to some advantages, such as switch without friction, the sealing is not easy to wear and open-close torque is little. It can reduce the match of the specifications of the actuator. With multi-turn electric actuators, which can realize to adjust the medium and heavy cutting. Bellows Cast Steel Globe Valves, bellows seal design, completely eliminates the common valve stem packing seal aging fast easy leakage faults, not only improve energy use efficiency, increase production equipment safety, maintenance cost was decreased, and the frequent maintenance, also provides a clean and safe work environment.
Product features:
1, product rational structure, reliable sealing, excellent performance, beautiful appearance;
2, seal face Co carbide surfacing, wear-resisting, corrosion resistance, good friction resistance and long service life;
3, the valve stem conditioning and surface nitriding treatment, has the good corrosion resistance and friction resistance;
4, double seal, it is more reliable in performance.
5, the valve stem lifting position indicator more intuitive;
6, parts materials, the size of the flange and butt weld ends can be reasonable selection according to actual working condition or the user requirements, meet the needs of the various kinds of engineering.
Bellows High Pressure Globe Valves adopts the unique design of double bellows seal which completely eliminates the stem packing seal leakage problem, meet the most stringent leakage level requirements. Such as corrugated pipe failure, valve stem packing seal can provide secondary seal to prevent leakage.
Bellows seal structure not only to eliminate the phenomenon of leaking, and no need maintenance, such as the need to change the internal parts, convenient, simple, fast, and all the parts up to standard and interchangeable.
In the bonnet/bonnet with bonus oil injection hole, valve rod and the nut bushing lubrication.
Bellows seal globe valve adopts unique spherical cone valve core instead of the traditional flat valve core. Manual and rough water control, valve core surface hardening treatment, improves the sealing performance, 6 each of the following can be installed in vertical, the valve core to adjust.
Bellows globe valve is suitable for the nominal pressure PN1.6 ~ 6.4 MPa / 150 lb, working temperature - 29 ~ 425 ° of petroleum, chemical, pharmaceutical, electric power industries under different conditions, such as the pipeline, cut off or connect pipe medium.
Bellows globe valve leakage generally divided into leakage and leakage in the two cases, the cause of leakage. Leakage in general because the fluid contains solid ruined, caused by leakage is the main reason of the corrugated pipe rupture failure sealing boundary. Site usage analysis, main and valve stem leakage outside the structure, working environment and using the operating mode.
Bellows globe valve stem using corrugated pipe, and packing structure double sealing structure, corrugated pipe and the inner ring and outer ring welded bellows components, then with the valve stem and guide body welding, blocking medium through the valve stem leakage to outside. Stem up and down movement distance through the flat key I limit. Valve is closed, flat key I downward movement, until completely contact disc and seat. Open valve, flat key I upward movement, until the flat key I face with packing the face under contact. Because the packing used is PTFE material, material is soft, if excessive open valve, will lead to a flat key I embedded filler, the valve cannot be opened and closed again, and cracking bellows components, result in media leakage along the valve stem. Corrugated pipe tensile length and amount of compression is set according to the valve stroke, if exceed the limit tensile or compression, it could damage the corrugated pipe, corrugated pipe burst, seal failure. Therefore need to increase the spacing device of valve opening and closing, the valve opening and closing process, bellows expansion in the scope of design.
Product features:
1, product rational structure, reliable sealing, excellent performance, beautiful appearance;
2, seal face Co carbide surfacing, wear-resisting, corrosion resistance, good friction resistance and long service life;
3, the valve stem conditioning and surface nitriding treatment, has the good corrosion resistance and friction resistance;
4, double seal, it is more reliable in performance.
5, the valve stem lifting position indicator more intuitive;
6, parts materials, the size of the flange and butt weld ends can be reasonable selection according to actual working condition or the user requirements, meet the needs of the various kinds of engineering.
Bellows High Pressure Globe Valves adopts the unique design of double bellows seal which completely eliminates the stem packing seal leakage problem, meet the most stringent leakage level requirements. Such as corrugated pipe failure, valve stem packing seal can provide secondary seal to prevent leakage.
Bellows seal structure not only to eliminate the phenomenon of leaking, and no need maintenance, such as the need to change the internal parts, convenient, simple, fast, and all the parts up to standard and interchangeable.
In the bonnet/bonnet with bonus oil injection hole, valve rod and the nut bushing lubrication.
Bellows seal globe valve adopts unique spherical cone valve core instead of the traditional flat valve core. Manual and rough water control, valve core surface hardening treatment, improves the sealing performance, 6 each of the following can be installed in vertical, the valve core to adjust.
Bellows globe valve is suitable for the nominal pressure PN1.6 ~ 6.4 MPa / 150 lb, working temperature - 29 ~ 425 ° of petroleum, chemical, pharmaceutical, electric power industries under different conditions, such as the pipeline, cut off or connect pipe medium.
Bellows globe valve leakage generally divided into leakage and leakage in the two cases, the cause of leakage. Leakage in general because the fluid contains solid ruined, caused by leakage is the main reason of the corrugated pipe rupture failure sealing boundary. Site usage analysis, main and valve stem leakage outside the structure, working environment and using the operating mode.
Bellows globe valve stem using corrugated pipe, and packing structure double sealing structure, corrugated pipe and the inner ring and outer ring welded bellows components, then with the valve stem and guide body welding, blocking medium through the valve stem leakage to outside. Stem up and down movement distance through the flat key I limit. Valve is closed, flat key I downward movement, until completely contact disc and seat. Open valve, flat key I upward movement, until the flat key I face with packing the face under contact. Because the packing used is PTFE material, material is soft, if excessive open valve, will lead to a flat key I embedded filler, the valve cannot be opened and closed again, and cracking bellows components, result in media leakage along the valve stem. Corrugated pipe tensile length and amount of compression is set according to the valve stroke, if exceed the limit tensile or compression, it could damage the corrugated pipe, corrugated pipe burst, seal failure. Therefore need to increase the spacing device of valve opening and closing, the valve opening and closing process, bellows expansion in the scope of design.
The design knowledge of Check valve slow-closing structure
Open check valves pipeline system as a downstream upstream, close the valve, mainly used to prevent the media back, to prevent the pump and drive motor reversal and the container medium discharge; the most commonly used is the valve around the valve pin rotation of the Swing Check Valves and the valve flap along the vertical lift center the line to move the valve, but the above 2 kinds of valves are closed when the media back speed from the largest decrease to zero rapidly, resulting in water pipes and pipe internal pressure rises rapidly, resulting in water hammer damage to pipeline system, so the general check valve production diameter of 50 ~ 500 mm (1). Water hammer effect to reduce the check valve, check valve used to expand the scope, the original product design basis, an additional relief valve closed deputy, solve the problem of pipeline water hammer boost.
1, the swing check valve with improved structure
In the original swing check valve slow closing Dual Plate Check Valves is additionally arranged on the side. Vice valve installed in the main valve flap side or both sides and connected with the normal flow of medium, medium pressure when the valve is opened, the Deputy valve is opened, the medium into the main valve outlet end through the auxiliary valve hole, so that the main valve inlet end pressure, the main valve valve opening, the main valve and pressure tends to balance; upstream medium, the main valve quick closing in countercurrent medium, while the upper side valve body for the buffer cylinder, vice valve cover is screwed into the valve body upper cover a hole, the Deputy valve and piston rod empty set of a certain gap, O type rubber ring seal between the piston and the buffer cylinder the lower part of the piston and the valve flap, between the flat seal; when the vice valve main valve with closed and closed, due to side valve cover holes in the role, through the medium of small gradually into the vice valve buffer cylinder cavity, the gap between the back part of the medium vice valve and piston rod, thus vice valve piston is slowly closing the. The structure of the main valve off the equivalent of fast closing phase, the Vice-valve slowly off the equivalent of the slow closing phase, based on hydraulic and mechanical transition mechanism of pumping unit shows that the structural design can effectively prevent water hammer boost.
2, lift check valve with improved structure
Lift Wafer Check Valves also known as the end, it can maintain the required suction pump to stop the water column (2); improvement of the valve structure is additionally provided with a slow closing valve as shown in Figure 2 in the main valve between the valve flap and valve stent.
The valve body and the bottom net is arranged between a pad ring, in addition to the increase in the valve seal height; buffer piston and cylinder cushioning rubber, the valve shaft and piston rigid connection, the buffer cylinder and a smaller gap between the valve flap shaft. When the medium downstream, the pressure medium open the valve flap into the main body cavity, while promoting the buffer piston upward; when the medium back, due to open within the buffer tank is filled with media, while the buffer tank and smaller gap between the valve flap shaft, so with the buffer medium in the cylinder is gradually passed through the gap, the main valve valve valve play a role of buffering, the pipeline water hammer pressure to control (Figure 2).
1, the swing check valve with improved structure
In the original swing check valve slow closing Dual Plate Check Valves is additionally arranged on the side. Vice valve installed in the main valve flap side or both sides and connected with the normal flow of medium, medium pressure when the valve is opened, the Deputy valve is opened, the medium into the main valve outlet end through the auxiliary valve hole, so that the main valve inlet end pressure, the main valve valve opening, the main valve and pressure tends to balance; upstream medium, the main valve quick closing in countercurrent medium, while the upper side valve body for the buffer cylinder, vice valve cover is screwed into the valve body upper cover a hole, the Deputy valve and piston rod empty set of a certain gap, O type rubber ring seal between the piston and the buffer cylinder the lower part of the piston and the valve flap, between the flat seal; when the vice valve main valve with closed and closed, due to side valve cover holes in the role, through the medium of small gradually into the vice valve buffer cylinder cavity, the gap between the back part of the medium vice valve and piston rod, thus vice valve piston is slowly closing the. The structure of the main valve off the equivalent of fast closing phase, the Vice-valve slowly off the equivalent of the slow closing phase, based on hydraulic and mechanical transition mechanism of pumping unit shows that the structural design can effectively prevent water hammer boost.
2, lift check valve with improved structure
Lift Wafer Check Valves also known as the end, it can maintain the required suction pump to stop the water column (2); improvement of the valve structure is additionally provided with a slow closing valve as shown in Figure 2 in the main valve between the valve flap and valve stent.
The valve body and the bottom net is arranged between a pad ring, in addition to the increase in the valve seal height; buffer piston and cylinder cushioning rubber, the valve shaft and piston rigid connection, the buffer cylinder and a smaller gap between the valve flap shaft. When the medium downstream, the pressure medium open the valve flap into the main body cavity, while promoting the buffer piston upward; when the medium back, due to open within the buffer tank is filled with media, while the buffer tank and smaller gap between the valve flap shaft, so with the buffer medium in the cylinder is gradually passed through the gap, the main valve valve valve play a role of buffering, the pipeline water hammer pressure to control (Figure 2).
Tuesday, April 16, 2013
Suggestions for sizing safety Relief Valves that prevents the interior pressure
A safety valve prevents the interior pressure of a boiler from rising to unsafe levels. Typical steam safety relief valves have a large spring that applies a downward force on a metal piston. If the pressure in a steam boiler rises high enough, it will overcome the force of the spring and the piston will lift, relieving the interior pressure. The design and size of a safety relief valve is extremely important for industrial process safety. This sizing refers to the minimum required orifice size inside the Air Valves. Guidance for sizing procedures and formulas can be found in the authoritative reference from the American Petroleum Institute (API), specifically the Recommended Practice 520.
1.Determine all of the credible overpressure scenarios for a steam boiler. This will be the basis for the sizing of the Forged Steel Valves. For example, in a natural gas boiler the gas burner could malfunction, causing excessive heat for boiling the water.
2.Determine the maximum steam generation capacity and the maximum pressure rating of the boiler. For example, assume the boiler has a maximum steam generation of 50,000 pounds per hour with a maximum pressure of 300 psi and a temperature of 422 degrees Fahrenheit.
3.Determine the minimum required orifice size of the valve using the formula from API 520. The formula is A = W/(C x Kd x P x Kb x Kc) x √(T x Z)/M where A is the orifice area in square inches, W is the steam generation, C is a steam coefficient equal to 330, P is the pressure, Kd, Kb and Kc are all constants equal to 1.0 in this case. T is the temperature of the steam, Z is the steam compressibility factor (assume it is 1.0) and M is the molecular weight of the steam, which is 18.01. This calculates out to be 2.44 square inches.
1.Determine all of the credible overpressure scenarios for a steam boiler. This will be the basis for the sizing of the Forged Steel Valves. For example, in a natural gas boiler the gas burner could malfunction, causing excessive heat for boiling the water.
2.Determine the maximum steam generation capacity and the maximum pressure rating of the boiler. For example, assume the boiler has a maximum steam generation of 50,000 pounds per hour with a maximum pressure of 300 psi and a temperature of 422 degrees Fahrenheit.
3.Determine the minimum required orifice size of the valve using the formula from API 520. The formula is A = W/(C x Kd x P x Kb x Kc) x √(T x Z)/M where A is the orifice area in square inches, W is the steam generation, C is a steam coefficient equal to 330, P is the pressure, Kd, Kb and Kc are all constants equal to 1.0 in this case. T is the temperature of the steam, Z is the steam compressibility factor (assume it is 1.0) and M is the molecular weight of the steam, which is 18.01. This calculates out to be 2.44 square inches.
Replacement Regulations and Testing for Pressure Relief Valve Leaks
In high pressure containers such as industrial boilers or heaters, which are subject to high heat inflow, a pressure release valve acts as an outlet for excess heat to flow out. The valve is programmed to open when it senses high heat in the system, and is normally activated by a spring which reacts when it feels pressure. When a relief valve develops a leak, it can create serious problems. The Environmental Protection Agency (EPA) and Department of Transportation (DOT) have regulations on leaks in a pressure relief valve.
VOC Leaks
A pressure relief valve must be equipped to detect volatile organic compound (VOC) leaks. Since a background leak can be present without being detected, the EPA stipulates that the scale of the pressure release valve must read at plus or minus 5 percent of the permissible leak limits.
Replacement Testing
According to the Department of Transportation, when a pressure relief valve leaks and is replaced in cargo vessels, the new device installed must have a leak rate of less than one liter when tested. The vessel's pressure relief valve must be tested by an agent authorized by the DOT to certify emissions on cargo vessels.
Replacement Regulations
VOC Leaks
A pressure relief valve must be equipped to detect volatile organic compound (VOC) leaks. Since a background leak can be present without being detected, the EPA stipulates that the scale of the pressure release valve must read at plus or minus 5 percent of the permissible leak limits.
Replacement Testing
According to the Department of Transportation, when a pressure relief valve leaks and is replaced in cargo vessels, the new device installed must have a leak rate of less than one liter when tested. The vessel's pressure relief valve must be tested by an agent authorized by the DOT to certify emissions on cargo vessels.
Replacement Regulations
In order to prevent leaks, the EPA mandates that relief valves be replaced at regular intervals. The time period between replacements is determined by the kind of heat producing device in which the valve is installed. State or city authorities can designate the replacement time frame for a given application of a pressure relief valve. For instance, in California, the flow rate of a heater with a pressure relief valve is determined by the number of square feet for which the heater provides heat, and the higher the flow rate, the more frequently pressure relief valves have to be replaced to avoid leaks.
Monday, April 15, 2013
Stainless steel ball valves give you a healthy environment
Today, specially invited Chinese Water Resources Institute Professor Zhou and South Group Wenzhou jiechao valve industry limited company's total two guests, to discuss topics related to the quality of drinking water at present.
Q: Lu total, why stainless steel ball valves can maintain the quality of drinking water in the transport process?
Answer: the 3 links of variable quality of drinking water is just Professor Zhou said bad, one of the second transportation links will be used before the valve, the valve are made of carbon steel or copper, after the 2 materials valve used for a long time, corrosion rust, corrosion and rust will produce metal ion for example, Cu ions, the metal ion is harmful to human body, Professor Zhou also talked about just now. The use of stainless steel ball valve greatly reduces the valve corrosion problems, so as to ensure the quality of water in the transport process.
Q: Lu total, at present and the South Group Wenzhou jiechao Floating Ball Valves industry limited production of stainless steel ball valve is mainly used in what areas? Or customer group is what?
Answer: each industry, but in recent years, the water company to purchase a large amount of.
After a brief discussion, let us understand that such a truth, only the source of drinking water quality is not enough, the transportation of water is also very important. Fortunately there is similar and South Group Wenzhou jiechao valve industry Co. Ltd.
Q: Lu total, why stainless steel ball valves can maintain the quality of drinking water in the transport process?
Answer: the 3 links of variable quality of drinking water is just Professor Zhou said bad, one of the second transportation links will be used before the valve, the valve are made of carbon steel or copper, after the 2 materials valve used for a long time, corrosion rust, corrosion and rust will produce metal ion for example, Cu ions, the metal ion is harmful to human body, Professor Zhou also talked about just now. The use of stainless steel ball valve greatly reduces the valve corrosion problems, so as to ensure the quality of water in the transport process.
Q: Lu total, at present and the South Group Wenzhou jiechao Floating Ball Valves industry limited production of stainless steel ball valve is mainly used in what areas? Or customer group is what?
Answer: each industry, but in recent years, the water company to purchase a large amount of.
After a brief discussion, let us understand that such a truth, only the source of drinking water quality is not enough, the transportation of water is also very important. Fortunately there is similar and South Group Wenzhou jiechao valve industry Co. Ltd.
Sunday, April 14, 2013
Two types of check valves can be installed in an Air Suspension
Air suspensions are gaining popularity every day. Installing a set of airbags or air cylinders can be simple enough to be installed at home, but it's important to do it right. One of the safest add-ons that you can make to an air suspension is adding check valves. A check valve allows air to only flow one way in an air system. Why is that important? Because if for some reason you lost pressure in a line, the entire air system would not evacuate, allowing you to either pull over to the side of the road, or get a jack under the truck to fix the problem. Installing check valves isn't complicated; it just takes some time.
There are two different types of check valves that can be installed in an air suspension, the only difference is how they mount. One style has male pipe thread on both ends, and the other has female pipe thread on both ends. Depending on how your air system is plumbed, one of these may be better than the other; it just depends on your specific setup. We'll start with a completed valve assembly and, for this example, will be using the male pipe thread style Wafer Check Valves.
There are two different types of check valves that can be installed in an air suspension, the only difference is how they mount. One style has male pipe thread on both ends, and the other has female pipe thread on both ends. Depending on how your air system is plumbed, one of these may be better than the other; it just depends on your specific setup. We'll start with a completed valve assembly and, for this example, will be using the male pipe thread style Wafer Check Valves.
Friday, April 12, 2013
Several methods of how to assort Steel Pipes
Steel pipe is used mainly in the home for gas supply lines and is coated black. Small lengths of stainless steel pipe are also used in connecting water heaters to copper water supply pipes via joints called dielectric unions. API 5L Seamless Steel Pipe comes in different lengths and is threaded at both ends, so it's important to calculate the required length of each pipe before purchasing it. Though it's possible to cut and thread the pipe yourself, special tools are required and this is usually done only by professionals. However, pipe can be cut and threaded to different lengths at major DIY stores.
1.Apply thread compound across and into the threads at each end of the first piece of pipe. Then screw one end by hand into the fixture (such as the house's gas meter). Tighten the pipe to the fixture using a pipe wrench.
2.Screw on a metal coupling to the other end of the pipe--again, tighten it in place with the wrench.
3.Thread the second piece of steel pipe into the other end of the coupling and tighten with the wrench. Continue in this fashion until all pipe and couplings are in place. Then at the last piece of pipe, screw on a shut-off valve--apply thread compound to the threads first--and tighten it in place.
1.Apply thread compound across and into the threads at each end of the first piece of pipe. Then screw one end by hand into the fixture (such as the house's gas meter). Tighten the pipe to the fixture using a pipe wrench.
2.Screw on a metal coupling to the other end of the pipe--again, tighten it in place with the wrench.
3.Thread the second piece of steel pipe into the other end of the coupling and tighten with the wrench. Continue in this fashion until all pipe and couplings are in place. Then at the last piece of pipe, screw on a shut-off valve--apply thread compound to the threads first--and tighten it in place.
How are Stainless Steel Pipes handle properly
Stainless steel is used for many different applications because of its non-corrosive surface, light weight, ease of cleaning and looks. Because of stainless steel's durable nature, there are few precautions to take when handling stainless steel pipes. There are, however, some guidelines to follow to ensure you get the most out of those pipes.
1.Wipe the Stainless Steel Pipes down with a clean rag and warm water to remove any dirt and oil from the surface. Dirt and oil can affect the corrosiveness of the pipes, so it is important to remove them before installation. After the pipe has been wiped down, rinse it with water and dry the pipe with a clean cloth.
2.Wear cloth or rubber gloves when handling stainless steel pipes to avoid leaving finger oil on the surface of the pipe. If any finger oil is present, clean the pipe as outlined.
3.Wrap the stainless steel pipes in butcher's paper when being stored to protect the surface of the pipes from contaminants. The cleaner the pipe's surface, the better it will hold up to corrosion when installed. If you notice contaminants on the pipe after storage, clean the pipe as outlined in Step 1.
4.Handle the pipe with care when moving and installing it, making sure to avoid causing defects in the steel's surface. Defects, including scratches and dings, can cause the pipes to corrode faster and decrease the life of the pipe. Also, do not paint stainless steel pipes as this can cause corrosion as well.
5.Install the steel pipe using whatever method necessary. If the pipe is exposed, you may clean the pipe with warm water (as outlined in Step 1) as often as you like to protect it from corroding, as stainless steel is not negatively affected by frequent cleaning.
1.Wipe the Stainless Steel Pipes down with a clean rag and warm water to remove any dirt and oil from the surface. Dirt and oil can affect the corrosiveness of the pipes, so it is important to remove them before installation. After the pipe has been wiped down, rinse it with water and dry the pipe with a clean cloth.
2.Wear cloth or rubber gloves when handling stainless steel pipes to avoid leaving finger oil on the surface of the pipe. If any finger oil is present, clean the pipe as outlined.
3.Wrap the stainless steel pipes in butcher's paper when being stored to protect the surface of the pipes from contaminants. The cleaner the pipe's surface, the better it will hold up to corrosion when installed. If you notice contaminants on the pipe after storage, clean the pipe as outlined in Step 1.
4.Handle the pipe with care when moving and installing it, making sure to avoid causing defects in the steel's surface. Defects, including scratches and dings, can cause the pipes to corrode faster and decrease the life of the pipe. Also, do not paint stainless steel pipes as this can cause corrosion as well.
5.Install the steel pipe using whatever method necessary. If the pipe is exposed, you may clean the pipe with warm water (as outlined in Step 1) as often as you like to protect it from corroding, as stainless steel is not negatively affected by frequent cleaning.
Thursday, April 11, 2013
How to spot A Stainless Steel Valve with high quality
Stainless steel is an excellent material for making valves. Stainless steel is highly resistant to corrosion and heat, and is an all around durable metal. A stainless steel valve holds up better over time than an ordinary steel or aluminum valve due to its resilient properties, making it a higher quality valve. Being able to identify stainless steel valves will enable you to determine whether or not the valves in your home are made of high quality metal.
1.Examine the finish of the valves. Stainless steel has a finish much brighter and more reflective than ordinary steel.
2 .Test the valves to find out if they're magnetic. Steel is magnetic, unlike copper or aluminum. All stainless steels are magnetic with the exception of austenitic grades; however, even some austenitics can become magnetized. If a magnet sticks to the valve, it is most likely steel.
3. Compare the magnetism of the valves to an ordinary piece of steel. Stainless steel has a weaker magnetic pull than ordinary steel. If your magnet sticks to the ordinary steel much better than the other valves, they are most likely stainless steel.
1.Examine the finish of the valves. Stainless steel has a finish much brighter and more reflective than ordinary steel.
2 .Test the valves to find out if they're magnetic. Steel is magnetic, unlike copper or aluminum. All stainless steels are magnetic with the exception of austenitic grades; however, even some austenitics can become magnetized. If a magnet sticks to the valve, it is most likely steel.
3. Compare the magnetism of the valves to an ordinary piece of steel. Stainless steel has a weaker magnetic pull than ordinary steel. If your magnet sticks to the ordinary steel much better than the other valves, they are most likely stainless steel.
Wednesday, April 10, 2013
Types, Problems and Benefits of butterfly valves
Types
Depending on the usage and pressure encountered, butterfly valves come in a wide assortment---from resilient (which uses the flexibility of rubber), to low or high pressure (tricentric) valves, industrial, wafer, plastic to stainless steel and manual or automatic.
Problems
The inability to thoroughly remove all residual substances due to its design is a drawback to using the butterfly valve in some situations. Highly corrosive or abrasive material will wear a valve down quickly; the valves are not recommended for those types of application. Improper (or careless) installation often leads to complaints about the Carbon Steel Butterfly Valves.
Benefits
There are many benefits in the use of a butterfly valve. On the whole they are priced lower than other types of valves. Due to the minimum parts involved in a butterfly valve they have a long operational life and are reliable. Their simple design makes them easy to maintain. Most butterfly valves are lightweight and compact. Butterfly valves are designed to withstand a wide range of temperatures and still work.
Depending on the usage and pressure encountered, butterfly valves come in a wide assortment---from resilient (which uses the flexibility of rubber), to low or high pressure (tricentric) valves, industrial, wafer, plastic to stainless steel and manual or automatic.
Problems
The inability to thoroughly remove all residual substances due to its design is a drawback to using the butterfly valve in some situations. Highly corrosive or abrasive material will wear a valve down quickly; the valves are not recommended for those types of application. Improper (or careless) installation often leads to complaints about the Carbon Steel Butterfly Valves.
Benefits
There are many benefits in the use of a butterfly valve. On the whole they are priced lower than other types of valves. Due to the minimum parts involved in a butterfly valve they have a long operational life and are reliable. Their simple design makes them easy to maintain. Most butterfly valves are lightweight and compact. Butterfly valves are designed to withstand a wide range of temperatures and still work.
Tuesday, April 9, 2013
Distinction Between Globe Valves and Ball Valves
While the purpose of a valve is to regulate the flow of a fluid, there are different types of valves for specific applications. Two common types are ball valves and globe valves.
Function
Ball valves have a chamber with a spherical ball that has a hole bored into it. The ball is connected to a handle, which is turned parallel to the line of flow to increase the flow of fluid or perpendicular to the line to stop the flow. Globe valves have a plate with a hole in it, and a disk or plug completely or partially fits into the hole, slowing or stopping flow, according to Peco Valve.
Ball Valve Benefits
Ball valves allow the user to see exactly what position the valve is in. If the handle is perpendicular to the line, the hole is facing perpendicular to the line, and therefore is fully closed.
Globe Valve Benefits
Globe valves offer greater precision than other valves when it comes to regulating flow, according to the GlobalSpec website. There is also less risk of water hammer, or the surge of pressure, when a valve is quickly closed.
Ball Valve Applications
Ball valves are used in high-pressure and shutoff applications, including chemical plants, according to King Valve. Because they do not wear easily, ball valves are often used where a valve is needed in the off position for extended periods.
Globe Valve Applications
Globe valves are used in applications where flow needs to be finely tuned. The seat, or the area that the stopper makes contact with, can deteriorate over time, causing leaks, so these are a poor choice for shutoff applications. Globe valves are designed to restrict flow, so they also are not ideal for operations requiring full, unobstructed flow.
Function
Ball valves have a chamber with a spherical ball that has a hole bored into it. The ball is connected to a handle, which is turned parallel to the line of flow to increase the flow of fluid or perpendicular to the line to stop the flow. Globe valves have a plate with a hole in it, and a disk or plug completely or partially fits into the hole, slowing or stopping flow, according to Peco Valve.
Ball Valve Benefits
Ball valves allow the user to see exactly what position the valve is in. If the handle is perpendicular to the line, the hole is facing perpendicular to the line, and therefore is fully closed.
Globe Valve Benefits
Globe valves offer greater precision than other valves when it comes to regulating flow, according to the GlobalSpec website. There is also less risk of water hammer, or the surge of pressure, when a valve is quickly closed.
Ball Valve Applications
Ball valves are used in high-pressure and shutoff applications, including chemical plants, according to King Valve. Because they do not wear easily, ball valves are often used where a valve is needed in the off position for extended periods.
Globe Valve Applications
Globe valves are used in applications where flow needs to be finely tuned. The seat, or the area that the stopper makes contact with, can deteriorate over time, causing leaks, so these are a poor choice for shutoff applications. Globe valves are designed to restrict flow, so they also are not ideal for operations requiring full, unobstructed flow.
Function,Significance,Features and Appearance of globe valves
A globe valve is a somewhat simplistic design but is crucial to modern plumbing and manufacturing. In use for more than 139 years, the globe valve was originally designed to help with the newly invented steam engine. The globe valve design is so efficient its remains a mainstay in pluming and industry here in the 21st century.
Function
The A351 CF3M Stainless Steel Globe Valves is used to regulate the flow of liquid in a pipeline. The most common application of the globe valve is a standard water faucet. When the wheel (handle) is turned, a disc is lowered or raised. When the disc is fully lowered, the water supply is shut off. When the disc is fully raised, the water flow is at its maximum rate.
History
The first patent for the globe valve was issued in February of 1870 to J.H. Davis.
Significance
The globe valve's invention coincided with the invention of the steam engine. The steam engine required better and more reliable valves to control water flow.
Features
The globe valve has several primary components. The wheel (handle) is connected to the stem which is in turn enclosed in a bonnet. The stem controls the movement of the disc which, when closed, fits into the seat to block water flow.
Appearance
Most globe valves have a spherical body with the stem and wheel extending from the top of the sphere. The shape of the body is where the globe valve gets its name.
Function
The A351 CF3M Stainless Steel Globe Valves is used to regulate the flow of liquid in a pipeline. The most common application of the globe valve is a standard water faucet. When the wheel (handle) is turned, a disc is lowered or raised. When the disc is fully lowered, the water supply is shut off. When the disc is fully raised, the water flow is at its maximum rate.
History
The first patent for the globe valve was issued in February of 1870 to J.H. Davis.
Significance
The globe valve's invention coincided with the invention of the steam engine. The steam engine required better and more reliable valves to control water flow.
Features
The globe valve has several primary components. The wheel (handle) is connected to the stem which is in turn enclosed in a bonnet. The stem controls the movement of the disc which, when closed, fits into the seat to block water flow.
Appearance
Most globe valves have a spherical body with the stem and wheel extending from the top of the sphere. The shape of the body is where the globe valve gets its name.
Monday, April 8, 2013
How to Maintain Water Valve and Flanged Safety Valve
Leaky water valves pose several different problems for home owners. The constant dripping sound can be an annoyance, the water escaping from the valve will elevate your water bill---and the liquid that rests on the floor or next to the foundation of your home will cause damage that may be irreversible if not taken care of immediately. Leaking water valves can be replaced, but the novice will find it easier, cheaper and quicker to replace the damaged fixture. All home owners should know a few basic plumbing skills, such as how to replace a leaky water valve.
Shut off the main water supply to the house. Locate the main supply valve just inside the home and turn it clockwise to prevent any more water from entering the plumbing system of the house. Open all of the water faucets in the house and allow them to run to purge all of the water from the system. Wait 3 hours for the system to cool completely if you replace a hot-water valve.
Place one pipe wrench on the pipe next to Flanged Safety Valves that is to be removed. Hook the second pipe wrench onto the valve itself. Spin the second pipe wrench counterclockwise while holding the first wrench firmly in place. Remove the faulty valve and discard it.
Wipe the pipe clean with a rag. Paint a thin layer of sealant, also known as "pipe dope," onto the threads of the pipe to make the pipe pressure tight and leak proof. Twist the replacement valve onto the threads of the pipe. Remember to hold the pipe with one wrench when you tighten the new valve with the second wrench. Restore the water supply to the house. Watch the faucets and turn them off when there is no more air coming out of the line and the water runs smoothly. Wipe up any water that leaked from the old valve with your rags. Check the new valve to be sure it's not leaking.
Shut off the main water supply to the house. Locate the main supply valve just inside the home and turn it clockwise to prevent any more water from entering the plumbing system of the house. Open all of the water faucets in the house and allow them to run to purge all of the water from the system. Wait 3 hours for the system to cool completely if you replace a hot-water valve.
Place one pipe wrench on the pipe next to Flanged Safety Valves that is to be removed. Hook the second pipe wrench onto the valve itself. Spin the second pipe wrench counterclockwise while holding the first wrench firmly in place. Remove the faulty valve and discard it.
Wipe the pipe clean with a rag. Paint a thin layer of sealant, also known as "pipe dope," onto the threads of the pipe to make the pipe pressure tight and leak proof. Twist the replacement valve onto the threads of the pipe. Remember to hold the pipe with one wrench when you tighten the new valve with the second wrench. Restore the water supply to the house. Watch the faucets and turn them off when there is no more air coming out of the line and the water runs smoothly. Wipe up any water that leaked from the old valve with your rags. Check the new valve to be sure it's not leaking.
Sunday, April 7, 2013
The operating requirement for steam hydrophobic valves
(1) excluding condensed water vapor does not leak. The exclusion of condensation from time to time, no leakage of steam hydrophobic Carbon Steel PTFE-Lined Valves is the most fundamental condition. Therefore, although it is excluded and the accumulation of steam condensate separation device, but not as condensate traps, and as steam traps. Hydrophobic valve action is accurate, sensitive means of condensate produced opening, closing the case. That exclude condensate, trap open, rapid discharge; discharge end can quickly shut down, prevent leakage of precious steam. This is the trap of the main performance. That is to say, the Cast Iron Valves is fully open and fully closed two cases, if the switch in slow motion, the switch is not in place, will cause the throttling effect, easy to cause the overall damage to the trap, but also the main reason the steam leak.
As on the action principle, Forged Steel Valves is fully open or fully closed, open, close the action. According to the different types, there may be continuous and intermittent discharge of two types of emissions.
(2) can be excluded from any place in the steam system all condensate. Traps must have to condensate produced any part of high-paying, accurately troubleshoot piping, steam use equipment, heat exchangers and other major equipment and steam system.
(3) simultaneous emission of air and condensed water. The air mixed with steam equipment, originally mixed in the steam, the steam into water only to be separated. It is in the heat transfer equipment using steam is formed on the surface of the air layer, seriously affecting the thermal conductivity, so the air must be excluded.
(4) applies pressure range. For the trap, if the pressure has changed slightly the performance to be affected, or even stop the action is not enough, need it in this case the performance is not affected, and can adapt to any pressure. At the same time the trap back pressure to allow a large degree.
(5) easy to repair and maintenance. Structure related to the requirements and the drain valve. Requirements of hydrophobic valve has the advantages of simple structure, fewer moving parts. In order to make the movement of the valve components do not produce stress, should be day to choose suitable materials, more important is its structure should be easy processing. In short, the steam trap management should be no set full-time staff regularly carry out maintenance work, that is to reduce the cost of repair.
(6) high practicality. The trap should be small in volume, light weight, high life, low price, and not because of air or steam barrier and the loss of the drainage capacity, occurrence and air blocking and steam vapor lock and other accidents.
The working principle and structure of stainless steel oxygen globe valves
Oxygen valve structure:
1 Globe valves structure in the form of the end, the end of the year, DC and rectangular. Straight through processing is the most common structure, but its fluid resistance.
2 DC resistance is a kind of liquid, containing solid particles or liquid viscosity. A forged angle body right, compared with the common way for small
The high pressure stop valve.
In the liquefied petroleum gas (LPG) in the reservation station, which is the oil refineries, chemical plants, petrochemical plants, liquefied petroleum gas, as a control valve used for lifting equipment.
Two, the working principle and structure
1 rotate the hand wheel clockwise, stem moves down, down to close the valve sealing surface, by cutting. The reversal is open, the highest point in the mentioned stem sealing work.
2 the valves is increased by a larger signs. There are two countries open the valve sealing, packaging and protective packaging layer.
3, the valve and the surface of the nylon products, the formation of filling filling sealing soft elastic material, good sealing performance.
Properties of oxygen valve closed
(1) simple structure, production of the door, and easy to maintain.
(2) the sealing surface is not easy to wear and abrasion, valves and valve sealing surface, open and close the sliding abrasion between the seal is good
Okay, good sealing performance, long service life.
(3) to open and close the valve stroke, thereby closing the valve height is less than the door, but the door structure.
(4) to open and close torque to open and close more effort, opening and closing time of directors.
(5) and the fluid resistance is small, the valve channel of communication, more twists and turns, small fluid resistance, energy consumption.
(6) when the common method of flow direction, downward nominal pressure PN ≤ 16MPa communication valve, pressure class under the guidance of the valve, the general use of communication management. In order to improve the seal. Cut-off media only one-way flow valve in use, you can't change the direction of water flow.
(7) the position is usually subject to erosion
1 Globe valves structure in the form of the end, the end of the year, DC and rectangular. Straight through processing is the most common structure, but its fluid resistance.
2 DC resistance is a kind of liquid, containing solid particles or liquid viscosity. A forged angle body right, compared with the common way for small
The high pressure stop valve.
In the liquefied petroleum gas (LPG) in the reservation station, which is the oil refineries, chemical plants, petrochemical plants, liquefied petroleum gas, as a control valve used for lifting equipment.
Two, the working principle and structure
1 rotate the hand wheel clockwise, stem moves down, down to close the valve sealing surface, by cutting. The reversal is open, the highest point in the mentioned stem sealing work.
2 the valves is increased by a larger signs. There are two countries open the valve sealing, packaging and protective packaging layer.
3, the valve and the surface of the nylon products, the formation of filling filling sealing soft elastic material, good sealing performance.
Properties of oxygen valve closed
(1) simple structure, production of the door, and easy to maintain.
(2) the sealing surface is not easy to wear and abrasion, valves and valve sealing surface, open and close the sliding abrasion between the seal is good
Okay, good sealing performance, long service life.
(3) to open and close the valve stroke, thereby closing the valve height is less than the door, but the door structure.
(4) to open and close torque to open and close more effort, opening and closing time of directors.
(5) and the fluid resistance is small, the valve channel of communication, more twists and turns, small fluid resistance, energy consumption.
(6) when the common method of flow direction, downward nominal pressure PN ≤ 16MPa communication valve, pressure class under the guidance of the valve, the general use of communication management. In order to improve the seal. Cut-off media only one-way flow valve in use, you can't change the direction of water flow.
(7) the position is usually subject to erosion
Tuesday, April 2, 2013
The assortment of stainless steel check valves
Swing check valves
Swing Check Valves with the humble hinge institutions, there is also a like the door of the disc is free to depend on the inclined surface of the seat. In order to ensure that each disc to seat the appropriate location, in valve design hinge agencies, in order to have enough plug valve kai xuan space, and the valve genuine and comprehensive engagement with the seat. All disc can be made from metal, can be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements. Swing check valves in the fully open conditions, almost unimpeded fluid pressure, so the pressure drop across the valve is relatively small.
Lift check valve
Lift check valve is located in the body of the valve seat valve seal surface. In addition to this check valve can be freely valve movements, like the rest of the cut-off valve, fluid pressure from the valve seat valve seal surface lift, medium return led to the disc back to seat, and cut off the flow. According to the conditions of use, valve can be all-metal structure, can be embedded in the disc on the shelf rubber mat or rubber ring form. As cut-off valve, fluid lifting of check valve through the channel is narrow, so that the lift check valve through the pressure drop than the swing check valve is big, and swing check valves are very few restrictions.
Stainless steel check valve
1) and the original plastic check valve production principles are the same. Overall is stainless steel or stainless iron. Need stiletto installation, advantage is that have the effect of the unidirectional fire, smoke prevention effect.
2) is the latest card button to install the new check valve, stainless steel or stainless iron is the whole, the vane type hinge type opening and closing valve sealing performance is better. Installation is more simple, the only is insufficient, or one-way fire. Could not reach the requirements of state administration of fire control.
Swing Check Valves with the humble hinge institutions, there is also a like the door of the disc is free to depend on the inclined surface of the seat. In order to ensure that each disc to seat the appropriate location, in valve design hinge agencies, in order to have enough plug valve kai xuan space, and the valve genuine and comprehensive engagement with the seat. All disc can be made from metal, can be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements. Swing check valves in the fully open conditions, almost unimpeded fluid pressure, so the pressure drop across the valve is relatively small.
Lift check valve
Lift check valve is located in the body of the valve seat valve seal surface. In addition to this check valve can be freely valve movements, like the rest of the cut-off valve, fluid pressure from the valve seat valve seal surface lift, medium return led to the disc back to seat, and cut off the flow. According to the conditions of use, valve can be all-metal structure, can be embedded in the disc on the shelf rubber mat or rubber ring form. As cut-off valve, fluid lifting of check valve through the channel is narrow, so that the lift check valve through the pressure drop than the swing check valve is big, and swing check valves are very few restrictions.
Stainless steel check valve
1) and the original plastic check valve production principles are the same. Overall is stainless steel or stainless iron. Need stiletto installation, advantage is that have the effect of the unidirectional fire, smoke prevention effect.
2) is the latest card button to install the new check valve, stainless steel or stainless iron is the whole, the vane type hinge type opening and closing valve sealing performance is better. Installation is more simple, the only is insufficient, or one-way fire. Could not reach the requirements of state administration of fire control.
The detailed information of stainless steel check valves
Nominal pressure or pressure level: PN1.0-16.0 MPa, ANSI CLASS 150-900, JIS10-20 k or nominal diameter diameter: DN15 ~ 900, NPS 1/4 ~ 36 connection mode: flange, butt welding, thread, socket welding, etc. Applicable temperature: 196 ℃ ~ 540 ℃ the valve body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304 l), CF8M (316), CF3M, Ti (316 l). Choose different material, can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media. This valve shall generally be installed in the pipeline.
The stainless steel check valves is belong to this type of valve, which includes swing check valve and lift check valve. Swing check valve with the humble hinge institutions, there is also a like the door of the disc is free to depend on the inclined surface of the seat. In order to ensure that each disc to seat the appropriate location, in valve design hinge agencies, in order to have enough plug valve kai xuan space, and the valve genuine and comprehensive engagement with the seat. All disc can be made from metal, can be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements.
The stainless steel check valves is belong to this type of valve, which includes swing check valve and lift check valve. Swing check valve with the humble hinge institutions, there is also a like the door of the disc is free to depend on the inclined surface of the seat. In order to ensure that each disc to seat the appropriate location, in valve design hinge agencies, in order to have enough plug valve kai xuan space, and the valve genuine and comprehensive engagement with the seat. All disc can be made from metal, can be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements.
Swing check valve in the fully open conditions, almost unimpeded fluid pressure, so the pressure drop across the valve is relatively small. Lift check valve is located in the body of the valve seat valve seal surface. In addition to this check valve can be freely valve movements, like the rest of the cut-off valve, fluid pressure from the valve seat valve seal surface lift, medium return led to the disc back to seat, and cut off the flow.
According to the conditions of use, valve can be all-metal structure, can be embedded in the disc on the shelf rubber mat or rubber ring form. As cut-off valve, fluid lifting of check valve through the channel is narrow, so that the lift check valve through the pressure drop than the swing check valve is big, and swing check valves are very few restrictions.
Monday, April 1, 2013
The analysis and troubleshooting measures of the reason for feel heavy when quickly turning the steering wheel
About 3 to weight different root cause analysis and troubleshooting measures
3.1 Valve core is deviating from the centre of the steering gear, or is in the middle position but with valve set do not match the aperture size of shoulder. Check to make sure that shoulder the sealing is good, the valve core in the middle position.
3.2 valve core and valve suites dirt block, to move around when the resistance is different. Disassemble and clean steering, ensure that the hydraulic oil clean.
3.3 improper adjustment nut. Checking and adjusting nut again.
3.4 the cause of the steering wheel wandering can also lead to turn left in the vehicle weight is different.
4 turn Stainless Steel Pipes when the steering wheel quickly feel heavy root cause analysis and troubleshooting measures
4.1 the oil pump drive failure sometimes. Drive belt skid or drive gear (key) wear. Check the oil pump parts of the tension of the belt can be adjusted, repair or replace the drive gear (key).
4.2 the oil pump fault connection parts. Oil pump connection is loose or missing, check the oil pump connection part, ensure the pump connection is firm and reliable.
4.3 flow control valve failure. Flow control valve spring is too soft or leaked seriously, leading to a sharp turn to the oil supply shortage. Check the flow control valve, replace if necessary.
4.4 relief valve failure or leakage is serious. Check valve, if necessary, replace.
4.5 pump excessive wear, internal leakage is serious. Check the oil pump working condition, repair or replace the pump.
4.6 oil pump type selection is wrong, making oil shortage. Replace the right pump.
3.1 Valve core is deviating from the centre of the steering gear, or is in the middle position but with valve set do not match the aperture size of shoulder. Check to make sure that shoulder the sealing is good, the valve core in the middle position.
3.2 valve core and valve suites dirt block, to move around when the resistance is different. Disassemble and clean steering, ensure that the hydraulic oil clean.
3.3 improper adjustment nut. Checking and adjusting nut again.
3.4 the cause of the steering wheel wandering can also lead to turn left in the vehicle weight is different.
4 turn Stainless Steel Pipes when the steering wheel quickly feel heavy root cause analysis and troubleshooting measures
4.1 the oil pump drive failure sometimes. Drive belt skid or drive gear (key) wear. Check the oil pump parts of the tension of the belt can be adjusted, repair or replace the drive gear (key).
4.2 the oil pump fault connection parts. Oil pump connection is loose or missing, check the oil pump connection part, ensure the pump connection is firm and reliable.
4.3 flow control valve failure. Flow control valve spring is too soft or leaked seriously, leading to a sharp turn to the oil supply shortage. Check the flow control valve, replace if necessary.
4.4 relief valve failure or leakage is serious. Check valve, if necessary, replace.
4.5 pump excessive wear, internal leakage is serious. Check the oil pump working condition, repair or replace the pump.
4.6 oil pump type selection is wrong, making oil shortage. Replace the right pump.
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