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。
The second step is to select the closure may be required to meet the speed of the check valve type.
第二步是选择可能满足所需要的关闭速度的止回阀类型。
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