止回阀的撞击现象，是由于在流体倒流之前，阀门的阀瓣没有到达关闭位置造成的。
Slamming of check valves is the result of failure of the valve disc to reach its closed position before the fluid flow reversal.
当有流体通过阀门时，第一阀瓣开启从隔膜密封上离开。
With flow through valve, primary check opens away from diaphragm seal.
清洗：检查或更换磨损的阀门阀瓣，断开控制管线，采用钝工具和锤打阀盖凸耳从阀体上旋下阀盖。
To CLEAN: Inspect or replace worn valve disc, disconnect control pipe and unscrew bonnet from valve body using blunt tool and hammer on bonnet lugs.
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