Metal Seal Utilized in Valves to Protect from High Temperature Damage

With the Valves heated in a fire application, the non-metal material parts such as seat sealing ring of PTFE, stem back seat gasket, gland packing, and the sealing gasket between body and bonnet might disintegrate or be damaged due to high temperature. Landee’s specially designed structure of auxiliary metal to metal seal is provided to effectively prevent both internal and external leakage of the Valves. Consider the case of long-term use, usually only do not use at 120 ℃. Valve is opening and closing parts of reciprocating rotary disc is about 90 ℃ to open, close and adjust a ball valve fluid channel.


Advantages:1, simple structure, small size, light weight, open and close rapidly, flow resistance coefficient; 2, can be used with suspended solid particles in the medium, based on the strength of the sealing surface can also be used in powder and granular media. Applicable to two-way opening and closing the ventilation and dust regulation, widely used in metallurgy, light industry, power, petrochemical and gas pipeline systems and other waterways.


Disadvantages: 1, flow control is not the scope, when the open up to 30%, the flow will be into more than 95%; 2, the structure of the Butterfly Valves and sealing material constraints, not for high-temperature, high pressure piping systems. General operating temperature below 300 ℃, PN40 (6 ~ 40) below. 3, the sealing performance relative to the valve member of this network for the scouring pump published, reproduced must be attached to the address rights reserved.