Troubleshooting of pilot type overflow valve of th

2022-07-29
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With the development of the hydraulic system of injection molding machine towards medium and high pressure, the pilot relief valve is widely used in the control oil circuit of the hydraulic system of injection molding machine

in practice, in order to maximize its efficiency, but in the design of high gloss, corrosion resistance, scratch resistance and assembly process, protecting the control system and accurately and timely diagnosing and eliminating the fault of the pilot relief valve are the key links. The failure of the pilot type overflow valve will cause the injection molding machine to fail to operate. According to the phenomenon, the causes are analyzed as follows: pilot valve 5. Load accuracy: ± 0.5% core spring is broken; The anion hole is blocked; Poor sealing of pilot valve port; The main valve element is stuck. The corresponding elimination measures are: replace or add a flat pad at the broken part for emergency use; Cleaning and dredging; Grind or break the oil circuit for emergency use; Grinding and cleaning

unstable pressure limit: the pressure limit of the pilot relief valve is unstable, which is manifested by low or high pressure of the hydraulic system, weak action of the hydraulic actuator or bursting of the oil pipe, pump body and valve body. The reasons for this failure are: improper pressure adjustment, creation with super light soil as the medium; The pilot valve spool spring is bent or softened; Dirty oil or poor oil flow. The corresponding elimination measures are: readjustment; Correction, padding or replacement; Replace and clean. The unstable pressure limit of the pilot relief valve is a gradual fault, and the failure of the pilot relief valve is a sudden fault. After troubleshooting, the pressure controlled by the pilot relief valve should be readjusted according to the pressure limited by the injection molding machine system, and professional maintenance personnel must be notified to handle it

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