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Butterfly valves are sometimes used inside the piping of air-conditioning facilities and the noise and vibration caused by cavitation can, in addition to making users uncomfortable, be mistaken for mechanical trouble. The need to prevent such noise and vibration is increasing from an environmental standpoint, and the prevention or suppression of cavitation itself is very important. Accordingly, many products have been proposed to prevent or control cavitation around many types of valves (Baumann,1991; Tullis,1989). As for research on the prevention of cavitation, the characteristics of a control valve with tortuous paths and an orifice with a multi-perforated cone to prevent cavitation from occurring around the orifice were reported.(Rahmaeyer et al.,1995; Kugou,1996)

Noise Reduction in Butterfly Valve Cavitation by Semicircular Fins and Visualization of Cavitation Flow