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Butterfly valves have been used to control the flow rate of various fluids in many industries because it have unique manageability compare to other valves. The flow rate passing through the butterfly valves can be controlled according to the coefficient of capacity calculated by disk angle change. In this study, flow analysis by 3D modeling was performed to derive the coefficient of capacity to evaluate and improve newly developed butterfly valves. Also, required measurement system was established to verify the performance of the valves, and to compare with the calculated results. Key Words : Grooved butterfly valve, capacity of coefficient, Disc Open Angle       . * Corresponding Author : Bong-Cheol ShinTel: +82-32-860-7306 email: kenny77b@empal.com 12 07 19  (1 12 10 09, 2 12 10 31)  12 11 08 1.                    .   ,              ,  ,  ,      .[1]                     .              ·    .[2,3] grooved butterfly valve ,                .                           .         OEM

A study on flow coefficient evaluation by shape change of butterfly valve