Typical type pilot relief valve fault diagnosis and troubleshooting

With the hydraulic system of construction machinery moving in the direction of the development of high-pressure and ultrahigh-pressure pilot relief valve type widely used in construction machinery hydraulic system in the control circuit. In the use of the practice, in order to maximize their effectiveness, the protection control system, accurate and timely diagnosis, rule out the possibility of pilot-type relief valve failure is the key element.



1, control failures, so that the fixed host



Pilot-type relief valve failure, the host can not result in action. According to the phenomenon, analysis of reasons: the pilot valve spool spring break; damping plug hole; pilot valve sealing valve port bad; the main spool, such as card dead. Excluded from the corresponding measure is: to replace or in the break pad Jiaping Department to emergency use; cleansing clear; grinding or the circuit breaker to the emergency use; grinding, cleaning.



2, limit pressure instability



Pilot-type pressure relief valve limits instability, the performance of the hydraulic system for low or high pressure, hydraulic actuator, or inability to move the pipeline, pump body, valve burst.



Caused by this failure include: improper pressure adjustment; pilot valve spool bending or soft spring; oil or dirty oil flows have been impeded. Excluded from the corresponding measures are as follows: re-adjustment; correction, plus pad, or replaced; replacement, cleaning.



Pilot-type pressure relief valve limits the gradual onset of instability for the failure, more than an hour in the reserves more motorized mechanical engineering; pilot-type relief valve for the sudden failure of failure, more than an hour in the reserves with less motor works machinery. After the failure in the end rule out the possibility, should the local system to limit the pressure on the pilot-type pressure relief valve to control re-adjustments. 

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