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- Steps To Accurately Size A Gas Control Valve Specify the required design flow rate Specify the allowable pressure drop across the valve Choose a valve type and body size from the manufacturers’ tables Calculate the first estimate of the piping geometry factor and pressure drop ratio factor
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Valve Sizing Calculations (Traditional Method) Introduction. Fisher® regulators and valves have traditionally been sized using equations derived by the company. There are now standardized calculations that are becoming accepted worldwide.
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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.
Gas Valve Sizing. by Editorial Staff. Sizing a control valve for gas or vapor service is more complicated than for liquid service, due to the compressibility of gases and vapors. As a gas or vapor compresses with changes in pressure, its density changes correspondingly.
This calculator is used to size gas control valves. The calculator determines the valve flow coefficient (Cv) required for a specified gas flow rate and pressure drop. The calculator can handle non-choked and choked flow.
Valve Sizing Calculator Manual This Section provides the User a practical guideline for the Valve Sizing Calculator use, showing the main features of the software and describing step-by-step how to size a Control Ball Valve.
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Flow Calculation for Gases. The coefficient of flow (Cv) is a formula which is used to determine a valve’s flows under various conditions and to select the correct valve for a flow application. The Cv was designed for use with liquid flows, it expresses the flow in gallons per minute of 60o F water with a pressure drop across the valve of 1 psi.
The step-by-step method outlined in this section is the most common method of sizing. NOMENCLATURE. Flow Capacity. The valve sizing coefficient most commonly used as a measure of the capacity of the body and trim of a control valve is Cv. One C. v is defined as one U.S. gallon per minute of 60 degree Fahrenheit water that flows through.
