止回阀应该安装在距离其他设备，如泵和压缩机等，尽可能远的地方。

Check valves should be located as far away from equipment such as pumps and compressors as possible.

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注意：在泵排泄口，首选的止回阀是管内弹簧负载，带杠杆和压铁或杠杆和弹簧的旋启式止回阀。

Note: On pump discharge, the preferred check valves are an in-line spring loaded, swing design with lever and weight or lever and spring.

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止回阀与安全阀在齿轮泵的输出管路上最好安装一个止回阀。

Check valve and relief valve on the output of the gear pump tube had better install a check valve.

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