Hydraulic pump proportional solenoid valve XKBF-01292

Main relief valve A relief valve located on the distributor valve body, its role is to limit the maximum pressure of the entire hydraulic system to protect the entire system from damage, if the spring in the valve breaks or the setting pressure is too low, it will lead to the pressure of the entire system is too low, because the pressure relief of the main relief valve makes the entire hydraulic system unable to establish the pressure required for the normal operation of the equipment. The main pump pressure oil can not promote the normal work of the actuator, there will be slow or even no action of the whole car, at this time should be checked to replace or adjust the main relief valve
The relief valve of excavator is easy to produce high-frequency noise, which is mainly caused by the unstable performance of the pilot valve, that is, the noise caused by the air vibration caused by the high-frequency pressure oscillation of the front chamber of the pilot valve. The main reasons are:
(1) Air is mixed into the oil, forming a cavitation phenomenon in the front chamber of the pilot valve and causing high-frequency noise. At this time, the air should be drained in time and the outside air should be prevented from re-entering.

(2) The needle valve in the process of use due to frequent opening and excessive wear, so that the needle valve cone and the valve seat can not close, resulting in pilot flow instability, pressure fluctuation and noise, this time should be repaired or replaced in time.

(3) The pressure regulating function of the pilot valve is unstable due to the fatigue deformation of the spring, which causes large pressure fluctuations and causes noise, and the spring should be replaced at this time.