Because the piston moves in two directions, there are leaf spring valves on both sides of the piston, which are called compression valves and extension valves respectively. Shanghai pneumatic butterfly valves supply suspended ball valves pneumatic butterfly valves ceiling acoustic pneumatic butterfly valves ceiling pneumatic butterfly valves and seismic effects ceiling pneumatic butterfly valves are mainly used to suppress the vibration of the ball valve when it bounces after shock absorption. Although the shock absorption ball valve can filter the vibration of the road surface, However, the ball valve itself will have reciprocating motion, and the shock absorber is used to inhibit the jump of the ball valve