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A Study on the Torque Characteristics of Butterfly Valve Disc in Fire Protection  

이동명 (경민대학 소방과학과)
박승옥 (주식회사 육송)
Publication Information
Fire Science and Engineering / v.16, no.2, 2002 , pp. 33-37 More about this Journal
Abstract
This study has investigated hydrodynamic of torque characteristics for disc of butterfly valve that is used in control for fire-protection water, The free-streamline theory is applied to predict hydrodynamic of torque characteristics. The torque characteristics of disc are corrected for the angles of attack of valve disc and surrounding velocity of flow by theoretical torque equation, and correction equation is added. The torque characteristics of disc are investigated for the ratio of hub thickness to the valve diameter. The result of prediction are shown to be successful as that show typical torque characteristics of butterfly valve. Since the velocity distribution around the disc is confirmed in a visualization, it is confirmed that the free-streamline theory can be used to predict the torque characteristics of disc.
Keywords
Butterfly valve; Disc; Torque characteristics; Free-streamline theory; Torque coefficient;
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