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Using Coefficients to Predict Dynamic Flow Torque for Quarter‐Turn Valves
Author(s) -
Rahmeyer William J.
Publication year - 1993
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1993.tb06049.x
Subject(s) - torque , mechanics , flow (mathematics) , control theory (sociology) , flow control valve , rotation (mathematics) , flow coefficient , damping torque , stall torque , mathematics , physics , engineering , direct torque control , mechanical engineering , computer science , geometry , voltage , thermodynamics , control (management) , quantum mechanics , artificial intelligence , induction motor
Quarter‐turn types of valves are subject to stresses and torques produced by the flow forces in the valve and by the rotation of the valve disk with an actuator. This article discusses the different types of torque to which a valve can be exposed, focusing on the use of dynamic flow torque coefficients to predict and evaluate flow torque. The derivation of a torque coefficient that incorporates the variation of geometry for different sizes of a valve is presented. The coefficient also utilizes a correction factor for the loss coefficient and gas expansion. A method and a scaling factor to correct flow torque coefficients for different valve sizes and loss coefficients are described. Several examples and plots of torque coefficients are included for various valve types.