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Ingenious removal method of pilot overflow valve of horizontal injection molding machine

Jul 28, 2020

With the development of the hydraulic system of the horizontal injection molding machine in the direction of medium and high pressure, the pilot relief valve is widely used in the control oil circuit of the hydraulic system of the horizontal injection molding machine. So, what are the clever ways to eliminate the pilot relief valve of the horizontal injection molding machine? It is introduced as follows.

 

    In practice, in order to maximize its effectiveness, maintain the control system, accurately and timely diagnose and eliminate the failure of the pilot-operated relief valve is a key part. The failure of the pilot relief valve will cause the horizontal injection molding machine to fail to operate. According to the phenomenon, the reasons are as follows: the pilot valve spool spring is broken, the female hole is blocked; the pilot valve port is not sealed well, and the main spool is stuck. The corresponding elimination measures are to 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.

 

    Unstable pressure limiting: The pilot-operated relief valve has unstable pressure limiting, which means that the pressure of the hydraulic system is low or high, the hydraulic actuators are weak, or the tubing, pump body, or valve body burst. The reasons for this failure are: improper pressure adjustment; the pilot valve spool spring is bent or soft; the oil is dirty or the oil does not flow smoothly. The corresponding elimination measures are readjustment, correction, padding or replacement, replacement, and cleaning. The instability of pressure limiting of the pilot type relief valve is a gradual failure, and the failure of the pilot type relief valve is a sudden failure. After the failure is eliminated, the pilot type relief valve should be controlled according to the pressure limited by the horizontal injection molding machine system The pressure is adjusted again.