This is the new version of Gravity Ball.

这是重力球的新版本。

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Gravity ball check may be converted for air or gas venting by replacement of standard ball with floater PP ball.

通过用漂浮的PP球更换标准球，重力球形止回阀可以改造为适用于空气或气体排气口。

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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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For 1998 IBM and Allstate, selling at below-market valuations, are my low- center-of-gravity ball carriers.

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As they pass through, they trace out an arc, just like a thrown ball falling due to gravity.

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