Cv Valve Unit Of Measure

A valve’s rated fl varies with the valve and trim style, it may vary from.99 for a special multiple stage trim to.60 for a ball valve.

Cv valve unit of measure. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate. 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. For measuring the valve capacity of control valves, the coefficient cv or its metric equivalent kv is adopted.

Then the definition must be taken as is and considered for its practical value, i.e. 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. This technical bulletin shows how flow can be estimated well enough to select a valve size—easily, and without

A valve has a published cv of 5.4 on 60°f water. The cv may be adjusted by division: A unit of volume equal to one hundred board foot.

It also explains both types of uom which are base unit of measure and alternative unit of measure. It is a unit of measure for comparing valve flows. And determining flow through a valve can be simple.

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. Butterfly valve cv values vary with the disc angle and valve size. Olynyk, in my opinion, cv is not derived from any equation in particular, but empirically defined (and measured) as the flow rate which flows through a valve at a given travel referred to 1 psi of dp across the valve and water at room temperature;

In the chart below, we show the approximate cv value of butterfly valves ranging from 2 to 24 and at various disc angles. 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 valve flow coefficient, cv, is the number of u.s.