Failure and troubleshooting of Welded Hydraulic Cylinders ove
Welded Hydraulic Cylinders system pressure does not rise
Reason 1:
①The cone surface of the main valve core is worn or out of round, and the cone surface of the valve seat is worn or out of round.
② Dirt sticks to the cone surface.
③The conical surface and the valve seat are not concentric due to machining errors.
④The main valve core is not well matched with the valve seat, and the main valve core is different or damaged, so that the valve core and the valve seat are not closely matched.
⑤ There is leakage at the main valve gland, such as damaged gasket, poor assembly, and loose gland screws.
Solution:
① Replace or repair the overflow valve body or main valve core and valve seat.
②Clean the overflow valve to make it fit well or replace unqualified components.
③Remove the main valve to adjust the spool, replace the damaged gasket, eliminate leakage and make the seal good.
Reason 2: The pilot valve adjustment spring is bent or too short or too soft, resulting in poor sealing at the junction of the poppet valve and the valve seat. For example, the poppet valve and the seat are worn, the contact surface of the poppet valve is not round, the contact surface is too wide, and it is easy to get dirty Objects, or glued.
Solution: Replace the unqualified parts or repair the pilot valve to make it meet the requirements of use.
Reason 3:
①The internal leakage of the remote control port is serious when the electromagnetic normally closed position;
② The valve body and slide valve at the valve port are severely worn;
③The spool valve does not reach the correct position, resulting in insufficient oil seal length;
④ There is leakage in the remote control port pipeline.
Solution:
① Overhaul and replace the failed parts to meet the requirements,
②Check the pipeline to eliminate leakage.
Welded Hydraulic Cylinders pressure suddenly rises
Reason 1:
①Because the main spool parts are not working sensitively, they are suddenly stuck in the closed state;
②The processed hydraulic components have low precision, poor assembly quality, and dirty oil.
Reason 2: The connecting surface of the pilot valve spool and the valve seat is stuck and cannot be separated, which causes the system to fail to realize normal unloading; the adjustment spring is bent "not strong".
Solution
Clean the main valve body, repair and replace failed parts.
Sudden drop in pressure
Reason 1:
① The main spool orifice is suddenly blocked.
②The gasket at the main valve cover is suddenly damaged.
③The main spool is not sensitive to work and suddenly gets stuck in the open state. For example, the machining accuracy of parts is low, the assembly quality is poor, and the oil is too dirty.
④The pilot valve core suddenly ruptured; the adjusting spring suddenly broke.
Reason 2: The solenoid valve solenoid of the remote control port is suddenly de-energized to unload the overflow valve; the pipe joint of the remote control port suddenly breaks or the pipe ruptures.
Solution
①Clean hydraulic valve components. If the valve components are blocked, the oil should also be filtered.
②Replace damaged components and repair failed parts.
③Check and eliminate electrical faults.
Welded Hydraulic Cylinders pressure drops suddenly
Reason 1:
① The main spool orifice is suddenly blocked.
②The gasket at the main valve cover is suddenly damaged.
③The main spool is not sensitive to work and suddenly gets stuck in the open state. For example, the machining accuracy of parts is low, the assembly quality is poor, and the oil is too dirty.
④The pilot valve core suddenly ruptured; the adjusting spring suddenly broke.
Reason 2: The solenoid valve solenoid of the remote control port is suddenly de-energized to unload the overflow valve; the pipe joint of the remote control port suddenly breaks or the pipe ruptures.
Solution
①Clean hydraulic valve components. If the valve components are blocked, the oil should also be filtered.
②Replace damaged components and repair failed parts.
③Check and eliminate electrical faults.