By American Water Works Association
Rather than specifying an AWWA general, this handbook offers engineers and technicians with a suggested technique 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.
Rather than specifying an AWWA normal, this guide offers engineers and technicians with a suggested procedure for calculations linked to the use and specification of butterfly valves in water structures. It contains the fundamentals of butterfly valve layout, definitions, and helping examples, 27 figures, and a desk. c. publication information Inc
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Extra info for Butterfly valves : torque, head loss, and cavitation analysis
London: MEP Limited. Tullis, J. Paul. 1989. Hydraulics of Pipelines. New York John Wiley & Sons. Tullis, J. M. Skinner. 1968. Reducing Cavitation in Valves. Journal of the Hydraulics Division of ASCE 94I-IY6, Process Paper, 6255 (November): 1475-1488. 45 Copyright American Water Works Association Provided by IHS under license with AWWA No reproduction or networking permitted without license from IHS = Licensee=ATLATEC S A DE C V/5972499002 Not for Resale, 12/29/2008 07:47:03 MST Index Note: f. indicates figure; t .
As the bubbles flow downstream and the pipeline pressure recovers, the bubbles violently collapse or implode. Measurements have shown that localized pressures of 100,000 psi (689 MPa) can be generated by the implosion of the bubbles. These rapid implosions can produce effects varying from a popping sound to rumbling or even a deafening roar approaching 100 decibels (Tullis, 1989, 138). Finally, when cavitation is fully developed, flow is restricted and no longer proportional to the square root of differential pressure.
Copyright American Water Works Association Provided by IHS under license with AWWA No reproduction or networking permitted without license from IHS Licensee=ATLATEC S A DE C V/5972499002 Not for Resale, 12/29/2008 07:47:03 MST --````,,,,,,,```,``,``,`,``,,,,-`-`,,`,,`,`,,`--- METHODS FOR REDUCING CAVITATION 32 BUTTERFLY VALVES: TORQUE, HEAD LOSS, AND CAVITATION ANALYSIS 3. Throttle the valve at a different valve opening position by changing the size of the valve. To maintain the same flow rate, a larger valve may be used at a more closed position, usually producing a lower cavitation coefficient, o,.