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原文
Check Valve (One-way valve) Category: 1: Material Classification: (check valve body material) 1 cast iron check valve. (2) brass check valve. 3 stainless steel check valve. II: classification by function: 1.NRVZ Silent Check Valve 2.NRVG Silent Check Valve Check Valve (One-way valve): automatically prevents fluid backflow is the valve. Check valve in the valve open under the effect of fluid pressure, fluid flow from the inlet side of the outlet side. When the pressure is lower than the import side of the outlet side of the valve flap in the fluid pressure, gravity and other factors, itself automatically close to prevent fluid backflow. Check Valve (One-way valve): generally divided into the lift, swing, butterfly and diaphragm and other types.
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是由上海赛泰泵阀有限公司提供的阀门新闻，中文译文仅供参考，以下提供站内导航搜索：

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译文：
止回阀(One-way valve)分类：一：按材质分类：（止回阀主体材质） 1.铸铁止回阀. 2.黄铜止回阀. 3.不锈钢止回阀. 二：按功能分类： 1.NRVZ静音式止回阀 2.NRVG静音式止回阀止回阀(One-way valve)：是能自动阻止流体倒流的阀门。止回阀的阀瓣在流体压力作用下开启，流体从进口侧流向出口侧。当进口侧压力低于出口侧时，阀瓣在流体压差、本身重力等因素作用下自动关闭以防止流体倒流。止回阀(One-way valve)：一般分为升降式、旋启式、蝶式及隔膜式等几种类型。

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