Slamming of check valves is the result of failure of the valve disc to reach its closed position before the fluid flow reversal.
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。
Failure position of valve shall be open.
故障时阀门位置为打开。
Failure position of valve shall be closed.
故障时阀门位置为关闭。
Failure position of valve shall be closed.
故障时阀门位置为关闭。
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