This guide presents suggestions for utilizing the flexible butterfly valve in waterworks carrier. assurance comprises approaches for calculating working torque, head loss, and cavitation. additionally integrated are prompt tools for selecting actuator sizes, warding off valve failure because of inner forces produced by means of water movement and strain, decreasing noise, and combating destructive vibrations.

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The formulas do not include safety factors or consider other properties that must be taken into account when sizing actuators. Refer to ANSVAWWA C504 and/ or ANSI/AWWA C540 for safety factors and other considerations necessary to properly size manual, cylinder, and electric actuators. Manual Actuator Sizing Manual actuators are sized based on two criteria. First, the actuator rating must exceed the maximum expected valve torque after applying suitable safety factors. Second, the actuator must be sized to allow operation of the valve without exceeding certain limits on handwheel pull force or input torque (80lb 1356 Nl handwheel rim pull force or 150 ft-lb [219N-m] input torque).

Also, less than 1 diameter of straight pipe usually lies between the check valve and the butterfly valve. When the check valve has horizontal pivot shafts, the butterfly valve should be installed with a vertical shaft. This positioning allows the high Copyright (C) 2001 American Water Works Association All Rights Reserved 42 BUTTERFLY VALVES: TORQUE, HEAD LOSS, AND CAVITATION ANALYSIS Figure 6-2 Vertical elbow upstream of a butterfly valve localized velocities to be divided evenly across the disc.

1995. Considerations for Evaluating Control Value cavitation. 231995. , Jr. 1978. Proper Butterfly Valve Application Avoids Costly Repairs. Water & Sewage Works 125:6 (June). Manufacturers Standardization Society. 1995. MSS Standard SP-67 Butterfly Values. : MSS. Rahmeyer, William J. 1986. Test Procedures for Determining Cavitation Limits in Control Valves. Journal AWWA 7811 (November): 55-58. 1993. Using Coefficients to Predict Dynamic Flow Torque for Quarter-Turn Valves. Journal AWWA 85:8 (August).

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