Valve Cv Formula Gas
Is valid the same relation or the constant is different ??.
Valve cv formula gas. The valve flow coefficient, cv, is the number of u.s. Cv = qg x 2 sg use when p 1 equals or is greater than 2 x p 2. Cv for fluids cv for liquids is the volume of 68°f water in u.s.
[m3/h] for a pressure drop of 1 psi [1 bar] across a flow passage [flow. For a specific control valve, flow coefficient cv/kv is determined experimentally by control valve manufacturers, and you can found it in manufacturers technical specifications. The pressure drop or flow rate through a valve or orifice plate is typically calculated using the a flow coefficient, cv or orifice diameter.
Flow coefficient is an imperial measurement and is defined as: As a gas or vapor compresses with changes in pressure, its density changes correspondingly. The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow.
The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as:. The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities. The cv rating for each valve is listed in the tables found in the valve catalog.
Equations displayed for easy reference. Find valve size and valve position of an unlined valve, with flow at 200 gpm and an actual pressure drop of 5 psi for a liquid with a specific gravity of 1.8. Q = valve flow rate in gallons per minute (us gpm) δp = difference between upstream and downstream pressure in
This is the basic equation for cv, where q is the rate of flow (gallons per minute), sg is the specific gravity of the fluid, and p is the pressure drop across the valve (psi). This article demonstrates how to convert between these two parameters when performing functions such as selecting a valve with an equivalent pressure drop to a given orifice plate. From cv table, the corresponding valve position is 70% open.
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