What are the faults of superimposed hydraulic control check valve?

As a key control component in the hydraulic system, the superimposed hydraulic control check valve has various types of faults and has a significant impact on system performance. The following are common faults of superimposed hydraulic control check valves and their detailed analysis:

1. Leakage failure

Aging and wear of the sealing ring or sealing surface: After long-term use, the sealing ring may lose elasticity due to aging, or the sealing may be loose due to wear and tear, causing hydraulic oil leakage.

Wear of the valve core and valve seat: Frequent contact and relative movement between the valve core and valve seat may cause wear, thereby destroying the sealing and causing leakage.

Dirt or burrs: Dirt in the hydraulic oil or burrs on the valve core and valve seat may scratch the sealing surface and cause leakage.

Solution: Replace the sealing ring or sealing surface, clean or replace the damaged valve core and valve seat components, and ensure the cleanliness of the hydraulic oil.

2. stuck fault

Wear of the valve core and valve seat: In addition to causing leakage, wear may also cause the valve core to become stuck in the valve seat and unable to move normally.

Dirt or burrs: Dirt or burrs may also jam the valve core and affect its normal operation.

Solution: Clean the hydraulic system to remove dirt and burrs; replace seriously worn valve core and valve seat components.

3. Insensitivity in work

Spring deformation or loss of elasticity: The spring is a key component that controls the action of the valve core. Its deformation or loss of elasticity will cause the valve core to respond insensitively.

Control pressure is too low: Insufficient control pressure may not allow the valve core to move against the spring force.

Solution: Replace the deformed spring to ensure that the control pressure reaches the specified value.

4. The hydraulic lock cannot be reset normally when it is closed.

The matching gap between the valve core and the valve body hole is too large: this may cause the valve core to be unable to be positioned accurately when closed, affecting reset.

The spring is excessively bent or broken: The bending or breaking of the spring will cause it to lose its restoring force, causing the valve core to be unable to reset.

The geometric dimensions of the valve core and valve body are not accurate enough: Inaccurate geometric dimensions may affect the cooperation between the valve core and the valve body, making reset difficult.

Solution: Replace or repair the valve core, valve body or spring to ensure that the fit clearance and geometric dimensions meet the design requirements.

5. Hydraulics cannot adapt to environments with strong load vibrations.

When the piston rod moves, the piston swings: there are pressure chambers and negative pressure chambers alternately in the rodless chamber and the rod chamber. Since the back pressure of the hydraulic cylinder is connected to the two chambers, the back pressure may open the hydraulic control check valve and enter the negative pressure zone.

The oil in the pressure chamber and hydraulic lock cannot be discharged in time: this may form high pressure and affect the normal operation of the hydraulic system.

Continuous vibration increases the pressure in the two chambers: In a strong vibration environment, the pressure in the two chambers may continue to increase, resulting in excessive pressure in the hydraulic system.

Solution: Use a single-side hydraulic lock instead of a double hydraulic lock to troubleshoot, or optimize the hydraulic system design to adapt to the load vibration environment.