旋启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。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。
旋启式止回阀 Swing Check Valves ; wind check valve ; swing check vingve ; flapper valve
旋启多瓣式止回阀 Multi-disc swing foot valve ; multi-disc swing check valve ; Multi-discng foot valve
双向旋启式止回阀 backflow gate
进口旋启式止回阀 Swing check valves
单瓣旋启式止回阀 Single disc swing check valve
钢制旋启式止回阀 Steel swing check valves
电站旋启式止回阀 XQSZHF
对夹旋启式双瓣止回阀 ZRD
多瓣旋启式止回阀 Multi-disc swing check valve
不锈钢旋启式止回阀 Specifications
在管道输送系统中，止回阀是重要的阀门之一，其中，旋启止回阀最为常用。
In pipeline systems, non-return valves are important valves, of which swing non-return valves are most widely used.
旋启式止回阀用于防止水平管路或垂直管路的流体倒流。
Swing check valves are used to prevent reversal of flow in horizontal or vertical pipe lines.
注意：在泵排泄口，首选的止回阀是管内弹簧负载，带杠杆和压铁或杠杆和弹簧的旋启式止回阀。
Note: On pump discharge, the preferred check valves are an in-line spring loaded, swing design with lever and weight or lever and spring.
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