止回阀是防止介质倒流的自动阀门，流体从进口侧流向出口侧。

Check valves are automatic valves to prevent the media back, fluid from the inlet to outlet side to side.

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对夹止回阀是用于防止管道和设备使用中介质倒流的一种 阀门；

Wafer swing check valve is used to prevent media from flowing backwards in pipeline and device ;

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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。

Headstock piece on media flows and forces open or closed to prevent backflow valve media called a non-return valve.

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