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。
Swing-type check off er the least pressure drop and offer simple automatic closure; when fluid flow stops gravity and flow reversal closes valve.
压降是超重力旋转床流体力学的重要特征之一。
The pressure drop is one of the most important characteristics in hydrodynamics of high-gravity rotating bed.
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