This is the new version of Gravity Ball.
这是重力球的新版本。
On an inner sleeve, a gravity ball blocking seat (24) are arranged.
内套上有重力弹丸塞座(24)。
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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