然后倒置安装阀门，使得流体将球提升到阀座上。

Then install valve upside down for fluid to lift ball into seat.

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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。

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.

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它们是否适合安装在任何位置，水平，垂直，在斜面，或倒置。

They are suitable for mounting in any position; horizontal, vertical, on an incline, or inverted.

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