The coefficient of flow or c v value is the number of us gallons of water the valve will pass with a differential pressure of 1psi through the valve at 60f. Bolted bonnet globe valves api 623 b 16 34 class.
Flow coefficients cv values.
Globe valve cv values. Valve size gate globe stop check swing check tilting disc check and lift check full port cv t pattern cv y pattern cv full port cv min. Cv is in imperial units. Gallons per minute that passes through the valve at a pressure drop of 1 psi at 68 f.
Flow coefficient k v volumetric flow rate of water at a. K v is the metric value of c v and is calculated as k v c v x 0 85. 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.
Of water at 60 f with a pressure drop of 1 psi. Example flow coefficient liquid. C v 25 gpm 1 1 psi 1 2 25 flow coefficient c v for saturated steam since steam and gases are compressible fluids the formula must be altered to accommodate changes in.
These valves are available with brass or stainless steel trim. 150 2500 size. Globe valves offer the best in class size cv range and close off pressure and provide precise control in hvac applications.
Globe valves are among the most popular design for control valves as they allow usually a fine regulation that cannot be reached by butterfly valves ball valves or gate valves. Flow coefficient c v it is the full capacity flow rate through the valve in us gallons min. Velan is a world leader in the design and production of a wide range of cast and forged steel gate globe check ball triple offset butterfly knife gate highly engineered severe service valves and steam traps offering superior performance across all major industrial applications.
C v varies with both style and size of valve but provides an index for comparing liquid. Cv flow coefficients of ball valve. The v5011 and v5013 threaded valve families have ansi 150 body class rating with 50 1 rangeability in equal percentage or linear flow characteristic.
Scv valve manufactures superior cast body bolted bonnet globe valves in a variety of materials trims packing types sizes 2 thru 18 and pressure classes 150 thru 2500. Cv is the volume of water in u s. In metric units the same coefficient often called the flow factor is kv and corresponds to the flow rate of water in.
Flow coefficient information scope the values given below are applicable to floating ball valve tru nnion mounted ball valve when the ball valve is in full open condition. The flow in between the inlet and outlet of the valve is regulated thanks to a plug that can rest on a seat to close the valve or get lifted in order to allow the flow. Flow velocity regular port cv flow velocity for fully open 1 for fully open 1 ft sec water 60ºf ft sec water 60ºf 1 1 2 93 16 31 55 9 89 32 7 20 2 170 30 57 101 9 43 60 6 87 2 1 2 273 48 92 161 9 08.