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RESEARCH PAPERS

Torque Characteristics of a 122-Centimeter Butterfly Valve With a Hydro/Pneumatic Actuator

[+] Author and Article Information
F. N. Lin, W. I. Moore, F. E. Lundy

NASA, Kennedy Space Center, Fla. 32899

J. Fluids Eng 103(3), 396-404 (Sep 01, 1981) (9 pages) doi:10.1115/1.3240799 History: Received March 24, 1980; Online October 26, 2009

Abstract

Actuating torque data from field testing of a 122-centimeter (48 in.) butterfly valve with a hydro/pneumatic actuator is presented. The hydraulic cylinder functions as either a forward or a reverse brake. Its resistance torque increases when the valve speeds up and decreases when the valve slows down. A reduction of flow resistance in the hydraulic flow path from one end of the hydraulic cylinder to the other will effectively reduce the hydraulic resistance torque and hence increase the actuating torque. The sum of hydrodynamic and friction torques (combined resistance torque) of a butterfly valve is a function of valve opening time. An increase in the pneumatic actuating pressure will result in a decrease in both the combined resistance torque and the actuator opening torque; however, it does shorten the valve opening time. As the pneumatic pressure increases, the valve opening time for a given configuration approaches an asymptotical value.

Copyright © 1981 by ASME
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