Abatement of Noise Generated by Control Valves.

Noise in control valves is shown to be generated by an of the following causes: mechanical vibration of inside moving components, cavitation of liquids, or aerodynamic turbulence. Using two parameters defining the control valves, it is possible to calculate oth cavitation noise and acrodynamic turbulence. A simple method based on graphs and tables is proposed which makes it possible to calculate aerodynamic noise with a high precision. The features of special commercially available anticavitation and antinoise valves are discussed.