Cv Meaning Control Valve

[m3/h] for a pressure drop of 1 psi [1 bar] across a flow passage [flow coefficient:

Cv meaning control valve. The cv, or flow coefficient of the valve, plays a much larger part in the valve’s performance than determining how many gpm (gallons per minute) can pass through the valve. This is used as a guide and is not a linear progression. For example a valve with a cv of 10 will flow 10 gpm with a 1 psi pressure drop.

What is the cv and kv of a control valve ? The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. For a specific gas control valve, the flow coefficient cg or kg is determined experimentally by control valve manufacturers, and you can found it in manufacturers technical specifications.

Chariot ventures, llc (hong kong) cv: The formula used to select the valve cv with the specified differential pressure is: Q = cv(dp/sg)^0.5 this assumes there is no flashing or cavitation of the fluid.

When flow is in the reverse direction, the port area opens fully to allow unrestricted flow. The cv control is an adjustable restriction which acts as a needle valve when flow is in the direction of the stem. Chapter 3 covers valve and actuator types.

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. Cras ves'pere (tomorrow evening) cv: Control vertices curve (form of nurbs) cv:

The speed of sound in steam will depend upon the steam temperature and the quality of the steam, but can be calculated from equation 6.4.2 if the conditions are known (mach. Cv = qg (g x t) 816 x p1 qg = cv 816 x p1 g x t note: No kv is 86.5% of cv, 100% cv is the maximum the valve will pass, we used to size for valve operation around 70%, now the norm is more like 40% requiring much larger safeties (if) the control valve is the limiting basis.