N a valve that closes by fluid pressure to prevent return flow 止回阀 (Also called nonreturn valve)
A check valve is a mechanical valve that only permits water flow in one direction.
检查阀(单向阀)是一个手动阀门，这样水只能往一个方向走。
This positions the relief valve below the first check valve, enabling the zone to drain through the relief valve outlet.
在这种位置，安全阀位于第一止回阀下面，使得这个区能够通过安全阀出口排放。
Check valve and relief valve on the output of the gear pump tube had better install a check valve.
止回阀与安全阀在齿轮泵的输出管路上最好安装一个止回阀。
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