(1) The spool and valve body hole of the spool valve assembly: when the gap between the two is 20%~25% larger than the assembly clearance value specified in the product drawings, the valve core must be repaired after increasing the size.
(2) The spool and seat of the poppet valve assembly: When the sealing contact surface of the conical seat valve is poor, because the poppet valve can automatically compensate for the gap under the action of the spring, it only needs to be ground and repaired.
(3) Repair of valve components such as seizure, wool pulling, grooving, etc.
(4) Repair of pressure regulating spring.
(5) Replacement of seals, etc.
