Transcription of Control Valve Sizing - CTi Controltech
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Control Valve Sizing - CTi Controltech
3-1 Rev. 6/94 CONTENTSI ntroduction .. 3-1 Nomenclature .. 3-1 Calculating Cv for Liquids .. 3-3 Liquid Sizing Examples .. 3-7 Calculating Cv for Gases.. 3-10 Gas Sizing Examples .. 3-13 Calculating Cv for Two Phase Flow ..3-15 Vapor Pressure Charts .. 3A-1 Steam Tables ..3A-7 Fluid Property Correlation Constants ..3A-21 Pipe Data .. 3A-29 INTRODUCTIONV altek uses a systematic method for selecting bodytypes, sizes, materials, pressure ratings and trim sizesbased on flow Control Valve flow capacity (Cv) is based upon theindustry standard, ANSI/ISA This standardand the corresponding measuring standards containEquations used to predict the flow of compressible andincompressible fluids in Control valves . Slightly differ-ent forms of the basic Equation are used for liquids steps for Sizing and selecting the correct valveinclude calculating the required Cv. Equations for calcu-lating Cv for both gases and liquids are found in has programmed the ANSI/ISA Sizing Equationsand procedures, making computer-aided Sizing avail-able on IBM-PC or compatible computers.
than a globe valve. Thus they tend to choke (or cavitate) at smaller pressure drops than globe valves. Liquid Critical Pressure Ratio Factor, F F The liquid critical pressure ratio factor, F F, multiplied by the vapor pressure, predicts the theoretical vena con-tracta pressure at the maximum effective (choked) pressure drop across the valve ...
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