某些系统配置，包括旋启式止回阀直接连接到其他法兰设备的场合可能要求考虑这种螺栓所需要的间隔。

Certain system configurations involving direct connection of a Swing Check Valve to other flanged equipment may require consideration of this bolt clearance.

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这种止回阀应用于玻璃管线系统中，安装在两个装有垫片的连接法兰中间。

This check valve is used in systems that utilize glass pipe and installs between connecting flanges where a gasket would normally be located.

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