Butterfly Valves - Torque, Head Loss, and Cavitation by American Water Works Association

By American Water Works Association

During this ebook water operators obtain whole information regarding the flexible butterfly valve in ingesting water carrier. Engineers and technicians will achieve a simple figuring out 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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Extra info for Butterfly Valves - Torque, Head Loss, and Cavitation Analysis - Manual of Water Supply Practices, M49

Example text

Head LOSS --sy5twn Head LO55 20 -Static Head 0 0 4 8 12 16 FlowVekcity fps Figure 2-26 Relationship between velocity and head loss in butterfly valves These methods are based on a n equivalent resistance model as graphically shown in Figure 2-26. CONSTANT HEAD SOURCE METHODOLOGY A typical constant head source application in a water system is the flow of water from an elevated reservoir to a residential water tap. Although the water level in the elevated reservoir changes throughout the day, at any given time the supply head (which is the elevation of the water level in the reservoir) is constant regardless of the water flow rate.

Sign Convention Note: For hydrostatic torque, e2is positive when oriented above the valve centerline, and negative when oriented below the valve centerline. See Figure 2-3. 4 lb/ft3 (1,000 kg/m3) Units US Customary (SI-metric) in. /in. /ft) (m/mm) in. (mm) lb/ft3 (kg/m3> VALVE TORQUE 33 I Figure 2-13 Hydrostatic torque Hydrostatic torque is proportional to disc diameter raised to the fourth power and may become significant on large valves. Assuming shaft and pipe horizontal, a 12411. 2 N-m); a 36-in.

For example, when one pump is running in a multiplepump application (see Figure 2-81, the pump will run further down on its pump curve and develop a flow rate higher than it would when the other pumps are operating. This higher flow rate can cause higher valve torques and stall the motor actuator. Individual torque components are discussed in detail in the following sections. SEATING TORQUE In symmetric and single-offset valves, the seating torque (T,) is caused by the friction and interference between the butterfly valve's rubber seat and the mating surface, as shown in Figure 2-9.

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