... 旋片式真空泵 rotary vane vacuum pump 旋启式止回阀 swing type check valve 旋启式止回阀，单向阀 flapper valve ...
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Bolt-Jointed Swing Type Check Valve 栓接阀盖旋启式止回阀
Swing-type check off er the least pressure drop and offer simple automatic closure; when fluid flow stops gravity and flow reversal closes valve.
旋启式止回阀压降最小，能够完全自动关闭，即在介质流动停止、重力和介质倒流的状态下自动关闭阀门。
Check them Safety Valves belonging to this type of valve, which includes Swing check valve and lift check valve.
其中止回阀就属于这种类型的阀门，它包括旋启式止回阀和升降式止回阀。
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