Transcription of Control Valve Sizing - Pro-Quip, Inc.
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Control Valve Sizing - Pro-Quip, Inc.
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.
Choked Flow Choked flow occurs in gases and vapors when the fluid velocity reaches sonic values at any point in the valve body, trim, or pipe. As the pressure in the valve or pipe is lowered, the specific volume increases to the point where sonic velocity is reached. In liquids, vapor
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Choked flow, Flow, Gases, Calculation, LECT05. Ideal Gas Calculations, GASES THROUGH TUBES AND ORIFICES, Pipe flow, Conductance of a tube, Flow through porous media, Computation of Natural Gas Flow Rate using, Mixing and Blending liquids, solids and gases, Pressure and Flow rate, Fundamentals of Pressure and Temperature Measurement