Download PDF by American Water Works Association: Butterfly valves : torque, head loss, and cavitation

By American Water Works Association

ISBN-10: 1583210415

ISBN-13: 9781583210413

ISBN-10: 1615837949

ISBN-13: 9781615837946

Annotation

Rather than specifying an AWWA general, this guide provides engineers and technicians with a advised process for calculations linked to the use and specification of butterfly valves in water platforms. It contains the fundamentals of butterfly valve layout, definitions, and helping examples, 27 figures, and a desk. c. booklet information Inc.

summary: Annotation

Rather than specifying an AWWA average, this handbook offers engineers and technicians with a instructed approach for calculations linked to the use and specification of butterfly valves in water platforms. It comprises the fundamentals of butterfly valve layout, definitions, and helping examples, 27 figures, and a desk. c. e-book information Inc

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Extra info for Butterfly valves : torque, head loss, and cavitation analysis

Example text

Selection of the cylinder bore size should be based on the minimum supply pressure to the cylinder. Additionally, ANSUAWWA C504 recommends applying safety factors based on the type of cylinder controls when selecting the bore of the cylinder. Safety factors are needed to allow for pressure drop in cylinder control valves and speed control devices. Higher safety factors are needed for cylinders powered by air and used for throttling flow, because the cylinder is moved by a floating differential across the piston which is created by a small orifice in the positioner.

2 &sec). Additionally, it is difficult to compare the Cu of a valve with other pipe elements such as elbows, tees, or runs of pipe. Conversely, the flow resistance coefficient, K , remains relatively constant for various types of valves or fittings. K is defined as the number of flow velocity heads lost due to a valve or fitting. 9, the system designer can place the 24-in. 47 (versus a Cu of 25,000) as falling between the normal head losses of an elbow and a tee. Additionally, the K values for pipe and fittings in series can be summed to find the total K for the piping system.

Giles, Ranald V. 1962. d Mechanics and Hydraulics, 2nd ed. New York: McGraw- Hill. , ed. 1976. ISA Handbook of Control Values, 2nd ed. : Instrument Society of America. Instrument Society of America. 1988. Control Value Capacity Test Procedure. 02-1988. 1995. Considerations for Evaluating Control Valve Cavitation. 231995. , Jr. 1978. Proper Butterfly Valve Application Avoids Costly Repairs. Water & Sewage Works 1256 (June). Manufacturers Standardization Society 1995. MSS Standard SP-67: Butterfly Valves.

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Butterfly valves : torque, head loss, and cavitation analysis by American Water Works Association


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