Learman S. Gas Control Valve Sizing Calculator

Blackmonk Engineering Ltd., 2009. — 9 p. This document describes the basis and operation of the Blackmonk Engineering Control Valve (Gas) Sizing Calculator. The calculation methodology is based on that described in Emerson Control Valve Handbook 4th Edition. This methodology uses the International Electrotechnical Commission (IEC) procedure. The calculator determines the control valve flow coefficient (Cv) required to pass a specified flow rate given the upstream and downstream pressure of the control valve, the fluid properties, the valve pressure drop ratio factor and the pipe geometry factor. The calculator also determines the ratio of specific heats factor, the effective pressure drop ratio factor, the expansion factor and determines if the flow through the valve is choked. The calculator is applicable to the sizing of gas and vapour control valves for
non-choked and choked flow. Link to online calculation: https://www.blackmonkengineering.com/pages/gas-control-valve-sizing.htmlCalculation Inputs
Calculation Outputs
Flow of Liquids Through a Control Valve
Effective Pressure Drop Ratio, Xeff
Ratio of Specific Heats Factor
Expansion Factor, Y
Pressure Drop Ratio Factor, XT
Piping Geometry Factor, FP
Calculation of Valve Flow Coefficient
Nomenclature
ExampleDescriptionSolution
Control Valve (Gas) Sizing Calculator Screenshot