In the natural gas pipeline, there is a kind of common valve, gas ball valve because of its special use, so for sealing performance requirements are higher, it is specific how to ensure its sealing performance?
In the structural design of the valve seat of the gas ball valve, there are generally two ways, such as downstream seat self-discharge design and double piston effect design. In the first seat design, when the line pressure is applied to the outer surface of the upstream seat ring in its closed state, the seat is pressed against the ball if the media leaks from the upstream to the inside of the chamber, when the internal pressure value of the Valve Chamber is higher than the pressure of its downstream pipeline, its downstream related valve seat will pressure its Valve Chamber pressure to its downstream and release it. And if the second form of the valve seat, under normal circumstances its pressure is acting on the outer side of the end of its seat seal ring, so that its seal ring pressure to its valve body to produce the corresponding extrusion pressure, thus, a more reliable sealing structure can be formed between the sealing ring and the valve body.
Even in the case of leakage of its valve seat, its pressure will directly enter its valve body inside, directly acting on its upstream sealing surface inside, and on its valve seat sealing ring squeeze force, make its seat sealing ring to its valve body slowly close to form a more reliable and effective sealing structure to ensure its sealing performance.
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