Ball Valve Cv Curve

The valve flow coefficient c v is a convenient way to represent flow capacity of a valve across a range of fluids and process parameters the c v calculator will calculate either c v or flow using the supplied additional parameters of fluid inlet and outlet.

Ball valve cv curve. There is more flow at small stem movement than a chart will indicate. This graph shows the cv or kv valve fraction vs opening and closing angle of a full bore ball valve. The full closure curve of a butterfly valve is then the above graph multiplied by the valve s flow coefficient or factor. The characteristic curve of a ball valve will move up as d p increases due to the valve closing.

Valve flow coefficient cv is a valve s capacity for a liquid or gas to flow through it. Fisher vee ball v150 v200 and v300 rotary control valves this bulletin covers the dn 25 through 600 nps 1 through 24 v150 v200 and v300 vee ball control valves. This graph shows the cv or kv valve fraction vs opening and closing angle of a butterfly valve. Cv kv fraction vs angle closure curve chart.

Cv value is an imperial measure of flow in us gallons per minute of water at 60 fahrenheit with a pressure drop of 1 psi across the valve. Typical flow coefficients c v for full bore valves. As a valve is opened more and more the cv increases until the valve is fully open where it reaches its highest possible cv or 100 open cv. Due to the large full open waterway and turndown ability of the ball valve it is much less prone to having phantom cv s.

Cv vs angle closure curve values table. The vee ball valve combines globe valve ruggedness with the efficiency of a rotary valve. The below cv values are used to give an indication of flow rates for ball valves. Metso control valve sizing coefficients 5 high performance triple eccentric disc valves l ansi150 neldisc high performance triple eccentric disc valve metal seated.

C v calculator for valve sizing. Ball valve flow coefficients c v flow coefficients c v for typical ball valves reduced and full bore leakage classification of control valves seat leakage classification through control valves. For full table rotate the screen. Control valves control valve terminology bodies trim flow characteristics cv and kv sizing noise actuators and positioners.

The full closure curve of a ball valve is then the above graph multiplied by the valve s flow coefficient or factor. This calculator can be used to help select a valve with enough flow capacity for a given application. The vee ball valve is a segmented ball valve which features a contoured segmented v. Cv kv fraction vs angle closure curve chart.