In the natural gas pipeline there is a more common valve, gas ball valve because of its special use occasions, so the requirements for sealing performance is relatively high, how is it specific to ensure its sealing performance?

In the structural design of its seat in the gas ball valve, there are generally two ways, such as the downstream seat self-discharge design and the design of the double piston effect. For the first seat design, in its closed state, when its line pressure acts on the outer surface of its upstream seat ring, it will press its seat toward its sphere, and if its medium leaks from its upstream into its valve chamber, when the pressure value in the valve chamber is higher than the downstream line pressure, its downstream associated seat will press its valve chamber pressure downstream to release it. If the second form of the valve seat, under normal circumstances the pressure is acting on the outer end of the valve seat sealing ring, which will press the sealing ring to its valve body to produce the corresponding extrusion pressure, so that 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 the inside of its valve body, directly acting on the inner side of its upstream sealing surface, and produce extrusion pressure on its valve seat seal ring, so that its valve seat seal ring is slowly close to its valve body, thus forming a more reliable and effective sealing structure to ensure its sealing performance.