Because the piston moves in two directions, there are leaf spring valves on both sides of the piston, called compression valve and extension valve respectively. Shanghai pneumatic ball valve supply suspended ball valve pneumatic ball valve - ceiling acoustic pneumatic ball valve ceiling pneumatic ball valve and seismic effect ceiling pneumatic ball valve is 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