Cv Calculation For Gas Control Valve

Approximate flow capacity can be determined for valves by using the given cv factor for a valve and applying them to the following formulae’s. When sizing a control valve, the most common approach is to calculate the flow coefficient, cv which is a measure of the capacity of the valve body and trim. It applies to the factor of the head drop (δh) or pressure drop (δp) over a valve with the flow rate q.

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Cv calculation for gas control valve. The cv of a valve never changes unless you make any modifications to the valve's physical characteristics. C v calculator for valve sizing. Gas velocity and pressure profile inside a control valve at this point, i need to point out that in addition to flow being proportional to the square root of the pressure drop ratio, it is also proportional to the square root of the density at the vena contracta.

Cv is the number of us gallons that goes through the valve at 60f and with a pressure drop of 1 psi. The formula will differ depending on the product the valve regulates, such as liquid, gas, or steam. Enter orange boxes with input data.

If flow capacity required is known and valve selection is desired, to calculate cv with the following formulaes and select appropriate valve from the manufacturers cv factor chart Of a control valve to the line will increase the turbulence downstream, resulting in even higher noise levels. Gas control valves are sized using a modified version of the liquid control valve equation.

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 valve flow coefficient cv or its metric equivalent kv has been adopted universally as a comparative value for measuring the capacity of control valves.

The larger this value, the higher the flow rate through the valve will be at a given pressure drop. As for liquid control valves, the valve orifice size as given as a “valve flow coefficient” or cv. Pa83, are you talking about converting between cv and cg where cg is the fisher valve coefficient for gases?

When gas, instead of liquid flows through this valve does the cv remains same. A valve cv can be described as the number of gallons per minute (gpm) at 60 o f (15.5 o c) that will pass through a valve with an associated pressure drop of 1 psi. Piping geometry factor of a control valve with attached fittings f lp 5.5 liquid critical pressure ratio factor f f 5.6 expansion factor y and specific heat ratio factor f 5.7 pressure differential ratio factor x t 5.8 pressure differential ratio factor for a valve with attached fittings x tp 5.9 reynolds number factor f r