How to control the noise of high and low temperature impact test chamber

High and low temperature impact test chamber is used to test the material structure or composite material, in an instant by high temperature, low temperature continuous environment can tolerate the degree, suitable for electricians, electronic products and components for cold test, rapid temperature changes or gradual conditions of the adaptive test chamber, especially suitable for electrical, electronic products environmental stress screening (ESS) test
.

The relief valve is easy to produce high-frequency noise, and the high and low temperature impact test chamber is mainly caused by the instability of the performance of the pilot valve, that is, the noise caused by the high-frequency oscillation of the front chamber pressure of the pilot valve causes air vibration, the main reasons are: (1) The oil is mixed with air, and the high and low temperature impact test chamber forms an air cavitation phenomenon in the front chamber of the pilot valve and causes 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 pilot valve is unstable due to the fatigue deformation of the spring, which causes the pressure regulation function to be unstable, so that the pressure fluctuation is large and causes noise, and the spring
should be replaced at this time.

(3) The needle valve of the high and low temperature impact test chamber is excessively worn due to frequent opening during use, so that the needle valve cone and the valve seat cannot be closely matched, resulting in unstable pilot flow, pressure fluctuations and noise, which should be repaired or replaced
in time.