The stem rises and lowers as the valve is opened and closed. 當閥門(mén)開(kāi)啟或關(guān)閉時(shí)，閥桿上升或下降。
The valve opens for tank discharge when tank head pressure is greater than valve inlet pressure. 當容器水頭壓力大于閥門(mén)進(jìn)口壓力時(shí)，閥門(mén)開(kāi)啟進(jìn)行容器排放。
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