Check the check valve spring.

检查逆止阀的弹簧。

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

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。

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Check the valve parts before installation. Open and close the valve by hand for a period check the open-close position of the valve gate.

检查阀门各部位是否有松动现象，对阀门进行手动开启、关闭一个周期是否有异常现象，同时检查阀门的启闭位置是否准确。

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