Then, whenever you open a hot water valve in your house, such as a sink or shower, then it will gravity feed.

这样，只要我们在任何时候打开房间内浴缸或的淋浴喷头的热水出水阀，热水器的水箱就能在地球引力的作用下自动添水。

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Gravity ball check valves are converted to vent valves by replacing the standard ball with a floater ball and inverting the valve at installation-with seat up.

重力球形止回阀可以变为通风阀，只需用漂浮球体更换标准球体，然后在安装时将阀门倒置，使其阀座向上即可。

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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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