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原文
Check Valve (One-way valve) Check Valve (One-wayvalve): also known as a one-way valve or check valve check valve, and its role is to prevent the media back in the pipeline. Pump water off the bottom valve check valve category also belong. Opening and closing pieces by media flow and forces to open or close, to prevent the media called the check valve backflow valve. Check valves are automatic valves, primarily for one-way flow of media channels, the only medium to flow in one direction, to prevent accidents. Structure Check Valve (One-way valve): according to the structure can be divided into the lift check valve, swing check valve and butterfly valve three. Lift check valves can be divided into vertical and horizontal. Swing check valves are divided into single lobe, double valve type and Orange Peel-type three. Butterfly valve for the straight-through, more than a few non-return valve in the connection form can be divided into threaded, flanged and welding three.
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译文：
止回阀(One-wayvalve)：止回阀又称单向阀或逆止阀，其作用是防止管路中的介质倒流。水泵吸水关的底阀也属于止回阀类。启闭件靠介质流动和力量自行开启或关闭，以防止介质倒流的阀门叫止回阀。止回阀属于自动阀类，主要用于介质单向流动的管道上，只允许介质向一个方向流动，以防止发生事故。结构止回阀(One-way valve)：按结构划分，可分为升降式止回阀、旋启式止回阀和蝶式止回阀三种。升降式止回阀可分为立式和卧式两种。旋启式止回阀分为单瓣式、双瓣式和多瓣式三种。蝶式止回阀为直通式、以上几种止回阀在连接形式上可分为螺纹连接、法兰连接和焊接三种。

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