泵浦若因堵塞或管路上的閥類(lèi)未開(kāi)啟等因素，會(huì )造成壓力升高。當這個(gè)異常壓力達到隔膜式釋壓閥所設定的壓力時(shí)，液體會(huì )由此2.jpg閥回流，以達到保護泵浦及管路的目的。

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.