By American Water Works Association
During this ebook water operators obtain entire information regarding the flexible butterfly valve in ingesting water provider. Engineers and technicians will achieve a simple knowing of calculations for working torque, head loss, and cavitation. insurance contains valve layout, torque, head loss, cavitation, trying out, noise, and vibration.
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Additional resources for Butterfly Valves - Torque, Head Loss, and Cavitation Analysis - Manual of Water Supply Practices, M49
Ft) (mz/mm2) 38 BUTTERFLY VALVES: TORQUE, HEAD LOSS, AND CAVITATION ANALYSIS Figure 2-20 Total closing torque (T,) for a 78-in. (2,400 mm) butterfly valve with symmetric and offset discs -t Figure 2-21 Shaft offset or eccentricity torque VALVE TORQUE 39 OTHER COMPONENTS OF TORQUE The elements of torque described in the preceding sections apply to most butterfly valve applications. In certain designs, installations, and sizes, calculation of other torques may be needed. Detailed explanations of these torques are normally beyond the scope of this manual, but they are described here for clarification and convenience.
Two commonly used coefficients are discussed in this chapter, and a simple methodology is presented for predicting butterfly valve head loss. DEFINITIONS For any given flow rate, a valve's head loss can be predicted by using standard flow equations and flow coefficients. Many flow equations are in use today, designed to satisfy many types of specific flow systems and conditions. The two most common flow coefficients used with butterfly valves in water service are C, and K. The C, valve flow coefficient, often used for control valves, is defined as the flow of water at 60" F (16"C), in gallons per minute, at a pressure drop of 1 psi across the valve.
Designs that are pressure assisted or otherwise variable based on the operating differential pressure. Seat designs that are not affected by pressure differential may have a C, value of zero. If the torque required to seat and the torque required to unseat are substantially different, separate seating coefficients and unseating coefficients can be developed in a similar manner using: Eq 2-8 Where: Variable Definition or Description C,,, Constant or pressure independent coefficient of unseating torque* Units US Customary (SI-metric) lb/in.