释压阀 Relief Valve
泵浦若因堵塞或管路上的阀类未开启等因素，会造成压力升高。当这个异常压力达到隔膜式释压阀所设定的压力时，液体会由此
阀回流，以达到保护泵浦及管路的目的。
It is to protect pumps from inadmissible excessive pressure.If the liquid reaches the preload pressure of the relief valve,the liquid flows through it to prevent pumps and pipes from damaged.
