Typical fault-type pilot relief valve What? How to exclude?

With the construction machinery hydraulic system to move in the direction of high pressure and high pressure, pilot-type relief valve is widely used in construction machinery hydraulic system in the control of asphalt. In use in practice, in order to maximize its effectiveness, protection control system, accurate and timely diagnosis, excluding pilot-type relief valve failure is the key component.



1, out of control, so that the host does not move



Pilot-type relief valve failure, will cause the host can not move. According to the phenomenon, analysis of the reasons are: the pilot valve spool spring break; damping hole plug; pilot valve sealing valve port bad; main spool choked to death and so on. The corresponding exclusion measures are: replacement of broken or in the office plus flat pad for emergency use; clean dredge; grind the asphalt, or open circuit to emergency use; grinding, cleaning.



2, limit voltage instability



Pilot-type pressure relief valve limits instability, manifested as low or high pressure hydraulic system, hydraulic actuator action unable or pipeline, pump, valve burst.



Cause of this failure for two reasons: the pressure to adjust himself; pilot valve spool spring bending or soften; oil too dirty or poor oil flow. The corresponding exclusion measures are: re-adjustment; correction, plus pad, or replaced; replacement, cleaning. Wear-resistant electrode



Limited pilot-type pressure relief valve for the gradual onset unstable failure, more than an hour more in reserve Motorcycle engineering machinery; pilot type relief valve failure as a sudden failure, often seen in the reserve motor works fewer hours machinery. Finished after a fault in the exclusion shall be defined by the machine of the system's pressure on the pilot-type pressure relief valve controls to re-adjust.

 

 

 

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