Check the check valve spring.

检查逆止阀的弹簧。

Connect vacuum hose to booster check valve.

连接真空软管到增压器检测阀。

To test for tightness of second check Valve.

检测第二止回阀的密封性。

Easily converts Ball Check Valve to a Foot Valve.

能够轻易地将球体止回阀转换成底阀。

Gate, Globe, Angle and Check Valve Figure Number System.

闸阀，截止阀，角阀和止回阀型号编制体系。