The relief valve is installed on the upper and lower ends of the main control valve of the excavator. The valve sets the highest pressure of the whole hydraulic system, sometimes it may noise, and then the long arm excavator is added to analyze the cause of the noise of the excavator overflow valve.
1, the oil is mixed with air, forming cavitation in the front of the pilot valve, causing high frequency noise. At this point, we must exhaust the air in time and prevent the outside air from re entering.
2. Because of the fatigue deformation of the excavator fittings, the pressure regulating function of the pilot valve is unstable, causing the pressure fluctuation to cause noise and the need to replace the spring.
3, the needle valve in the use of frequent opening and excessive wear and tear, so that the needle valve cone and the seat can not close close, causing lead flow instability, resulting in pressure fluctuations and cause noise, need to repair or replace in time.
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