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。

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Invest a few dollars in a good dial-type tire pressure gauge and use it to check your tire pressure once a week.

花钱买个刻度盘式轮胎气压测量仪，并用它每周一次检查轮胎压力。

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Welding type high pressure check valve is only allowing media to flow in one direction, and stop the flow direction.

焊接式高压单向阀只允许介质向一个方向流动，而且阻止方向流动。

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