Pay attention to the noise of the regulating valve

Cavitation and noise are the two major hazards of regulating valves in controlling high pressure differential fluids. The noise on the regulating valve is the main source of pollution in petrochemical production. In addition to the use of low-noise structure control valves, changing the operating conditions of the valve is the fundamental way to eliminate or reduce cavitation and noise. When the regulating valve is working, it should pay attention to its noise condition. Analyze the noise generating mechanism to better monitor the working state of the regulating valve and effectively deal with the problems.

(1) Mechanical vibrations—such as when the spool moves horizontally within the sleeve, the gap between the spool and the sleeve can be as small as possible or a sleeve with a hard surface can be used.

(2) Natural frequency vibrations—such as spools or other components—have a natural vibration frequency. For this purpose, the characteristics of the spool can be changed by special casting or forging processes, and other types can be replaced if necessary. Spool.

(3) Spool instability - such as the noise generated by the pressure fluctuation of the fluid caused by the oscillating displacement of the spool, which is generally caused by the damping factor of the regulating circuit actuator, etc., which can be re-adjusted The coefficient or the damping device is added to the spool displacement direction.

(4) Mechanical fluidity of the medium - When the medium flows through the pipe or the regulating valve, it also emits noise. For this case, it will not be elaborated here (cavitation will also generate