Question: When the hydraulic control check valve in the hydraulic system is reversely cut off (that is, when the control port does work), the spool cannot strictly seal the liquid flow cause leakage. What should I do?

Reasons: The valve core is in close contact with the valve seat, the different axis of the valve body hole the valve core is too large, the valve seat is pressed into the valve body hole, so on.

Answer: Re-distribute the hydraulic system valve core valve seat remove the valve seat press-fit it again until it is in close contact with the valve core.

Question: The dual hydraulic control check valve cannot be unloaded in reverse, what should I do?

Reason: The concentricity between the spool hole the control piston hole in the hydraulic system exceeds the standard, the end of the control piston is bent, causing the control piston top rod to reach the unloading spool, the unloading wide core cannot be opened.

Answer: Repair replace the hydraulic control check valve. Common Faults Diagnosis Elimination Methods of Hydraulic Control Check Valve in Hydraulic System

Question: What should I do if the hydraulic control check valve cannot return to the initial oil sealing position when it is closed?

Reasons: The processing geometric accuracy of the valve body hole the valve core is low, the gap between the two is improper, the spring is broken excessively bent, which causes the valve core to jam.

Answer: Repair replace the hydraulic control check valve.