The common malfunction problem analysis metal baling press pressure reducing valve

1. Metal baling press pressure reducing valve in and out of the oil meet the mouth: to reverse plate valves for installation, the pipe type valve is over mistakes. Valve should be paid attention to when using oil near the mouth of tags, or refer to product catalog for all hydraulic parts, design right and wrong.

2. The inlet pressure is too low, after reducing valve core throttling mouth, lower output from the oil outlet pressure, this time should be found out the cause of the low inlet pressure (such as valve failure).

3. The metal baling press circuit load is too small, the pressure reducing valve downstream of the pressure build up, at this time may be considered in the downstream of the pressure reducing valve concatenated throttle valve to solve.

4. The pilot valve (cone valve and valve seat due to dirt retention and poor contact between mating surface, not closed; Or the guide cone with serious scratches, seat with hole circle, there are gaps, caused the guide valve core and valve seat hole is not closed.

5. When repairing and packing cone valve cone valve is not installed in the valve seat hole. To this, can monitor the assembly of the cone times or closed.

6. The main valve core on the damping hole were choked up with dirt, oil cannot damping hole of the bottom of the main valve core into the main valve spring chamber, the feedback of the oil cavity pressure transmission is less than the guide cone valve, make the lost to the main valve outlet pressure pilot valve adjustment; Damping hole plugging, the main valve spring cavity lost oil pressure of employment, the main valve into a spring force is very weak (only the main valve spring balance) straight moving type valve, therefore, in the oil outlet pressure is low, can overcome the balance spring force and make the pressure reducing valve throttle.

7. The guide valve spring (pressure regulating spring) wrong like a soft spring, or cause permanent deformation or fracture by spring fatigue, pressure is not high, exports held can only be transferred to a fixed value, this value is far lower than the maximum control pressure of the pressure reducing valve.

8. The regulating handle a strained thread or effective depth is not enough, cannot twist exactly and cannot be transferred to the maximum pressure.

9. Bonnet seal between the body and bad, serious leakage, the forerunner of oil flow pressure is not enough, the pressure couldn't get on. Reasons may be the o-ring packing or damage, compression screw does not tighten and there was a face cover processing roughness error, cover face is generally all round convex, concave in the middle.

10. The main valve spool due to dirt and assassinate stuck in the small open position, make the outlet pressure is low, can be washed and deburring.