Cv Value For Valves Definition

The formulas provided here are simplified for general use. The valve coefficient, cv, is a number which represents the capability of a valve (or any flow component) to flow a fluid. For a quick guide to valve designs, see table 3.

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It is defined as the flow rate in us gallons per minute [gpm] of water at a temperature of 60º fahrenheit with a pressure drop across the valve of 1 psi.

Cv value for valves definition. The standard equation for a valve's capacity in liquid service is: An orifice or valve passage which has a cv coefficient of 1.00 will pass 1 gpm of water (specific gravity 1.0) with a pressure drop of 1 psi. Choosing the valve “series” your next step is to choose a basic valve design to do the job.

It is a number published by the valve manufacturer that describes the number of u.s. Every pneumatic device possesses a specific conductance, identified as cv. Known as cv, the flow coefficient is a relative value that allows us to compare the efficiency of different valves regardless of their size or type.

Flow coefficient normally expressed as cv or kv depending on the countries. Full port valves will have a higher cv than reduced port valves. Has been contributed to offer high quality product to the global market.

Cv — an essential design and diagnostic tool. Check out the definition of cv to understand more clearly. It is used to determine the appropriate sizing of the valve as well as evaluating the flow kinetic energy in regards with process and piping integrity.

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 = qg (g x t) 816 x p1 qg = cv 816 x p1 g x t note: Liquid critical pressure ratio factor, f f the liquid critical pressure.

In my opinion, calculated cv is a cv value calculated at particular conditions (p1, p2, flow rate, specific gravity etc.). The control valve handbook has been a primary reference since its first printing in Cv is the valve cv.