Cv Value For Control Valve

Cv in case of control valve indicates its size (port area) for the certain design value of flow with the required pressure drop.the standard defination of cv is “the number of u.s. The density of water at 15°c is 999.13 kg/m 3. 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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The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow.

Cv value for control valve. C v & flow calculator. The density of water at. A control valve performs a special task, controlling the flow of fluids so a process variable such as fluid pressure, fluid level, flow rate or temperature p q cv where can be controlled.

Is an industry leader in the manufacturing of control valves and associated instrumentation. [m3/h] for a pressure drop of 1 psi [1 bar] across a flow passage [flow coefficient: Please contact us if the fluid specification requires viscosity correction.

The formula will differ depending on the product the valve regulates, such as liquid, gas, or steam. [m3/h] for a pressure drop of 1 psi [1 bar] across a flow passage [flow. The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities.

The larger the cv, the larger the flow at a given pressure differential. This approach is sound as long as two things are verified: The flow rate for a liquid q = cv * sq.

Gallons per minute of water at 60°f that will flow through a control valve at a specified opening when a pressure differential of 1psi is applied across the valve: Cv is determined by the manufacturer of the valve and can be found on the valve manufacturer's website and/or related valve data and specification sheets. Kv = 0.864 * cv.

Q is the rate of flow (expressed in us gallons per minute), Gallons per minute of water which will pass through a given flow restriction with a pressure drop of 1 psi. For on/off control, it is common practice to select a valve with connections that are the same size as the piping.