Reasons for the noise of the relief valve

Reasons for the noise of the relief valve

Relief valve The overflow valve is prone to high-frequency noise, which is mainly caused by the unstable performance of the pilot valve, that is, the noise generated by the high-frequency oscillation of the pressure in the front chamber of the pilot valve caused by air vibration. The main reasons are.

1. Air is mixed into the oil, and cavitation is formed in the front cavity of the pilot valve, which causes high-frequency noise. At this time, the air should be exhausted in time and the outside air should be prevented from re-entering.

2. The needle valve is excessively worn due to frequent opening during use, so that the needle valve cone surface and the valve seat cannot be tightly fitted, resulting in unstable pilot flow, pressure fluctuations and noise. At this time, it 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 makes the pressure fluctuate greatly and causes noise. At this time, the spring should be replaced.