Transcription of Engineering Information For PDC Butterfly Valves
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Engineering Information For PDC Butterfly Valves
Engineering Information For PDC Butterfly Valves Valve Sizing: Cv sizing is the most widely used method for valve sizing, today. By using the Cv method, the proper valve size can be accurately determined for most applications when any three of the four following conditions are known or assumed: valve size, maximum flow, inlet pressure or maximum delta P. By using the Cv formulas listed below in conjunction with the Cv factors for PDC Butterfly Valves and the maximum allowable pressure drops for PDC Valves listed for each valve class, the proper PDC Butterfly valve for each application can be determined. In addition to the standard Cv equations other forms of the equation are listed for determining flow or the delta P for PDC Valves . Critical Flow: When calculating the required valve Cv, the formula to be used is dependent on the flowing media and if the pressure drop is critical or subcritical.
Engineering Information For PDC Butterfly Valves Sizing for: zLiquids zGases zSaturated Steam Service zVapor Flow (other than steam) Sizing For Liquids Where: Cv = Flow coefficient (number of U.S. gallons of water flowing through a valve with a pressure drop of 1 psig) G = Specific gravity of flowing media at system temperature.
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