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。
Gravity ball check may be converted for air or gas venting by replacement of standard ball with floater PP ball.
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.
锻钢止回阀阀瓣形式还分别有截流形，针形，球形您可以根据实际情况合理选用我们的阀门。
Forged steel check valve is respectively cut manifold, needle, ball you can according to the actual situation of reasonable selection of our valves.
锻钢止回阀阀瓣形式还分别有截流形，针形，球形您可以根据实际情况合理选用我们的阀门。
Forged steel check valve is respectively cut manifold, needle, ball you can according to the actual situation of reasonable selection of our valves.
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