How to solve the problems of noise and cavitation in the application of pneumatic control valves?

In application, the noise of pneumatic control valve is the main source of pollution in petrochemical production. Cavitation and noise are the two main problems in controlling control valves in high pressure differential fluids. So, what are the reasons for these two problems? How can we solve it?

1. Mechanical vibration-For example, when the valve core of the pneumatic control valve moves horizontally in the sleeve, the gap between the valve core and the sleeve can be as small as possible or a hard-surfaced sleeve can be used.

2. The mechanical fluidity of the medium-when the medium flows in the pipeline or pneumatic control valve, noise will also be generated. In this case, we will not give a specific explanation, of course, cavitation will also produce noise.

3. Natural frequency vibration-For example, the valve body and other parts of the pneumatic control valve have natural vibration frequency, so the characteristics of the valve body can be changed through special casting and forging treatment, and other types of valve bodies can be replaced if necessary.

4. When the causing factor is the spool unstable-if the noise caused by the fluid pressure fluctuation caused by the spool vibration displacement is usually caused by damping factors such as the adjustment circuit actuator, the damping coefficient can be re-adjusted or the spool Increase damping facilities in the direction of displacement.
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