The use of ball valves in natural gas pipelines is usually a fixed shaft ball valve, and its valve seat usually has two designs, namely the downstream valve seat self release design and the double piston effect design, both of which have the function of double cutoff sealing.
When the valve is in the closed state, pipeline pressure acts on the outer surface of the upstream valve seat ring, causing the valve seat ring to tightly adhere to the sphere. If the medium leaks from the upstream valve seat into the valve chamber, when the pressure in the valve chamber exceeds the downstream pipeline pressure, the downstream valve seat will detach from the ball and release the pressure in the valve chamber downstream of the valve.
The natural balloon valve with dual piston effect design normally exerts pressure on the outer side of the end of the valve seat sealing ring, which forces the valve seat sealing ring to press towards the valve body, thereby forming a seal between the valve seat sealing ring and the valve body.
If the valve seat leaks, pressure will directly enter the interior of the valve body, acting on the inner side of the upstream sealing surface of the valve seat sealing ring and tightly squeezing the upper part of the valve seat sealing ring. At the same time, this force will force the valve seat sealing ring to press towards the valve body, thereby forming an effective seal between the valve seat sealing ring and the valve body.
Natural gas ball valves have been increasingly used in modern production and daily life.
Post time: Jul-10-2025