Failure and troubleshooting of Welded Hydraulic Cylinders overflow valve
Welded Hydraulic Cylinders must use relief valves in some technical requirements,
to control the safety of Welded Hydraulic Cylinders.
Welded Hydraulic Cylinders system pressure fluctuation
The main causes of pressure fluctuations:
①The pressure adjustment screw loosens the lock nut due to vibration, causing pressure fluctuation.
②The hydraulic oil is not clean, and there is tiny dust, which makes the main spool inflexible. This produces irregular pressure changes. Sometimes the valve is stuck.
③The main spool does not slide smoothly, causing the orifice to be blocked.
④The conical surface of the main valve core is not in good contact with the conical surface of the valve seat, and it has not been well ground.
⑤ The damping hole of the main spool is too large to have a damping effect.
⑥ The pilot valve adjustment spring is bent, causing poor contact between the valve core and the cone valve seat and uneven wear.
Solution
①Clean the oil tank and pipeline regularly, and filter the hydraulic oil entering the oil tank and pipeline system.
② If there is a filter in the pipeline, the secondary filter element should be added, or the filter precision of the secondary element should be replaced, and the valve elements should be disassembled and cleaned and replaced with clean hydraulic oil.
③Repair or replace unqualified parts
④ Reduce the damping aperture appropriately.
Welded Hydraulic Cylinders system pressure cannot be increased at all
the reason:
① The orifice of the main spool is blocked. If the main spool is not cleaned during assembly, the oil is too dirty or there are people and debris during assembly.
②Poor assembly quality, poor assembly accuracy during assembly, poor adjustment of the gap between the valves, and the main valve core stuck in the open position, resulting in poor assembly quality.
③The return spring of the main spool is broken or bent, so that the main spool cannot be reset.
Solution
① Disassemble the main valve to clean the orifice and reassemble it.
②Filter or replace the oil.
③Tighten the bonnet fastening screw to replace the broken spring.
Reason 2: The pilot valve is faulty.
① The adjusting spring is broken or not installed.
②The cone valve or steel ball is not installed.
③The cone valve is broken.
Solution: Replace damaged parts or reinstall parts to restore the pilot valve to normal operation.
Reason 3: The solenoid valve of the remote control port is not energized (normally open type) or the slide valve is stuck.
Solution: Check the power line to see if the power is on; if it is normal, it may be that the spool valve is stuck, and the failed parts should be repaired or replaced.
Reason 4: The hydraulic pump is malfunctioning.
① The coupling key of the hydraulic pump falls off or rolls.
②The gap between the sliding surfaces is too large.
③The vane of the vane pump is stuck in the rotor slot.
④The blades and rotor are installed in reverse.
⑤The spring in the blade is deformed or broken due to fatigue due to the high frequency periodic load.
Solution:
①Replace or re-adjust the coupling key, and repair the keyway.
② Repair the gap between sliding surfaces.
③ Disassemble and clean the vane pump.
④ Correct the wrong installation direction.
⑤ Replace the broken spring.
Reason 5: The inlet and outlet ports are installed reversely and adjust them to the right.