The torque characteristics of butterfly valves, obtained through pressure distribution measurements, are described. Two dimensional flat plate and circular arc discs and three dimensional scale models were used. The moment distributions resulting from the disc surface static pressure measurements for the flat plate and three dimensional models produce similar torque characteristics. The net torque is at its minimum with valves that are fully open or at large angles. The net torque increases to a maximum at an intermediate angle associated with flow separation and reattachment on the downstream valve disc surface. At 0DEGREES the torque is independent of the pressure ratio. Problems occurring in areas where the pressure distributions were all defined are outlined.
|Original language||English (US)|
|Number of pages||4|
|Journal||IN: INDUSTRIAL APPLICATIONS OF FLUID MECHANICS, PRESENTED AT ASME WINTER ANNUAL MEETING, (BOSTON, U.S.A.: DEC. 13-18, 1987),|
|State||Published - 1987|
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