How to diagnose the fault of pilot relief valve
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Release Time：2017-10-18
With the development of the hydraulic system of construction machinery, the pilot relief valve is widely used in the control circuit of the hydraulic system of construction machinery. In operation practice, in order to maximize its effectiveness and protect the control system, it is a key step to diagnose and eliminate the fault of the pilot relief valve accurately and timely. 1, control failure, so that the host does not move the pilot relief valve failure, will cause the host can not work. According to the current situation, the analysis of the reasons are: the pilot valve spool spring broken; Plinic hole blockage; The pilot valve port is poorly sealed; The main valve core is stuck. The corresponding elimination measures are: replace or add flat pads at the break for emergency use;
With the development of the hydraulic system of construction machinery, the pilot relief valve is widely used in the control circuit of the hydraulic system of construction machinery. In operation practice, in order to maximize its effectiveness and protect the control system, it is a key step to diagnose and eliminate the fault of the pilot relief valve accurately and timely.
1, control failure, so that the host does not move
The pilot relief valve failure, will cause the host can not work. According to the current situation, the analysis of the reasons are: the pilot valve spool spring broken; Plinic hole blockage; The pilot valve port is poorly sealed; The main valve core is stuck. The corresponding elimination measures are: replace or add a flat pad at the broken place for emergency use; Cleaning and dredging; Grinding or breaking the oil circuit for emergency use; Grinding and cleaning.
2. Unstable pressure limit
The pilot relief valve pressure limit is unstable, which is manifested as low or high pressure of hydraulic system, weak action of hydraulic actuator or burst of oil pipe, pump body and valve body.
The reasons for this failure are: improper pressure adjustment; the pilot valve spool spring is bent or softened; the oil is too dirty or the oil flow is not smooth. The corresponding exclusion measures are: readjustment; correction, padding or replacement; cleaning.
The unstable pressure limiting of the pilot relief valve is a gradual fault, which mostly occurs in construction machinery with more motorcycle hours. The failure of the pilot relief valve is a sudden failure, which mostly occurs in construction machinery with less motorcycle hours. After troubleshooting, the pressure controlled by the pilot relief valve should be re-adjusted according to the pressure limited by the system of the machine.
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