Repair and maintenance of commonly used hydraulic control valves

1. Hydraulic valve repairable content
① After the spool and valve body hole wear, when the matching gap increases by more than 20% than the design value, it is necessary to redo the spool to repair the valve body hole matching.
② When the sealing performance of the cone valve core and the seat becomes worse, it should be repaired.
③ When the valve spring, especially the pressure regulating spring, is bent, weak or broken, the spring should be replaced.
④ Seals aging, failure, causing internal and external leakage, should be replaced seals.
⑤ If the hydraulic valve is stuck, failure, slow and other working disorders, it should be cleaned.

2. Daily inspection and maintenance of hydraulic valve
① Pay attention to observe whether the hydraulic valve is in normal working condition.
Often check the working pressure of the hydraulic system and whether the action of the actuator is normal, so as to determine the working state of the corresponding hydraulic valve.
③ Before the hydraulic pump starts, the hydraulic valve should be carefully checked whether it is in the specified adjustment state.
(4) Take effective measures to control the temperature rise and pollution degree of the working medium, so that it meets the working requirements of the hydraulic valve.
⑤ Pay attention to keep the hydraulic valve clean and prevent pollutants from entering the system.
The connection screw for the installation of the hydraulic valve should be regularly checked and regularly tightened to prevent loosening.
⑦ Regular cleaning and replacement of seals for some hydraulic valves.
The electromagnetic directional valve should pay attention to whether there is a "buzzing" noise or the smell of insulation deterioration when energized.