This guide offers counsel for utilizing the flexible butterfly valve in waterworks provider. assurance contains approaches for calculating working torque, head loss, and cavitation. additionally incorporated are prompt equipment for selecting actuator sizes, warding off valve failure as a result of inner forces produced by means of water stream and strain, lowering noise, and fighting harmful vibrations.
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Additional resources for Butterfly Valves - Torque, Head Loss, and Cavitation Analysis
02, except that piping manifold losses are subtracted to determine K, for a valve. 6. Pressures are measured in the pipe run 2 times the pipe diameter upstream and 10 times the pipe diameter downstream of the valve (figure 5-1). Measurements are taken through static-wall, piezometric pressure taps located on opposite sides of the pipe at each location. 02. 7. 5 percent. 8. The accuracy of the pressure measurements must remain within an error range of *2 percent of the measured pressure differential.
45 Copyright (C) 2001 American Water Works Association All Rights Reserved INDEX Index Terms Links Note: f. indicates figure; t. indicates table. A Actuator removal 43 Actuator sizing cylinder actuators 40 electric actuators (and switch settings) 41 manual actuators 39 ANSI/AWWA C504, Standard for RubberSeated Butterfly Valves 1 B Bearing torque 9 Buoyancy torque 9f. 10 10f. 16 Butterfly valves actuator removal 43 actuator sizing 39 cautions 42 design 1 2f. diameter 5 6f. and pipe installations 41 and throttling flow 43 C Cautions 42 Cavitation 1 27 choking 28 29f.
The purpose of this chapter is to present a practical methodology for testing rubber-seated butterfly valves and developing flow, torque, and cavitation coefficients. Testing is not a requirement of this manual or ANSI/AWWA C504. Coefficients can also be developed through analytical methods and based on geometric similarities. However, greater accuracy can be expected from testing. TEST1NG REQU I REMENTS The following requirements must be met in designing and conducting flow and torque tests: 1.
Butterfly Valves - Torque, Head Loss, and Cavitation Analysis