Cv value for ball valve

Q is the rate of flow (expressed in us gallons per minute), Has been contributed to offer high quality product to the global market. It allows you to calculate the flow or c v (flow coefficient) to make the relationship visible between the pressure drop (the difference in pressure between two points in a network transporting a liquid or gas) and the flow rate. The valve flow coefficient cv or its metric equivalent kv has been adopted universally as a comparative value for measuring the capacity of control valves. Cv [gpm] [psi] nps (inches) dn (mm)full bore: The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities. Valves are tested by running water through it before publishing the cv value. Select a valve which offers calculated cv for the minimum and maximum flow between 20% to 80% of port opening. C v & flow calculator. Each valve has its own flow coefficient. With global layout and firmly foundation at asia, we are now recognized as an international brand in taiwan. C v calculator for valve sizing. Is there a source for a conversion formula to give the systems guys a k value from the valve bore and cv value. Go to online calculation of the flow coefficient cv and kv. Flow coefficient (cv or kv) value.

※3 for p1 and p2, please use pressure close to the valve. Ball valve floating type for reduce and full bore. There are different types of designs in the ball valve family. Flow coefficient k v ——volumetric flow rate of water at a. We recommend you select a valve for which the cv falls between 20% and 80% open stem travel. You may also open the equivalent valve product pages on this website. This is our valve c v calculator. Nosuch6_wp march 2, 2017 0. Online calculator to quickly determine valve and orifice cv & kvs values for air. Founded at 1980, value valves co., ltd. As the stem opens, the cv increases. This is used as a guide and is not a linear progression. 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. In deciding the size of the control valve that (port size) we need to calculate the cv value of the process (calculated cv) by calculating cv has educated more than 50 years, which is involved in. Of water at 60 °f with a pressure drop of 1 psi.

Cv = valve coefficient gpm = water flow rate in gallons per minute t.p = differential pressure (upstream pressure minus downstream. Equations displayed for easy reference. 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. The valve's flow coefficient, cv, is a value that is determined by flow testing for each valve size. ※2 calculation of viscosity correction is necessary when the fluid is liquid and the kinematic viscosity is 20 mpa・s or more and the calculated cv value is 0.01 or less. Size 150 300 600 900 1500 2500 2 42 42 42 45 38 25 2.5 67 67 67 / / / 3 100 100 100 90 95 65 4 185 185 185 170 170 1005 6 440 440 440 400 395 265 Begin by looking up the flow coefficient (cv) for your balon regular port ball valve on the corresponding product page in balon's current product catalog. A lot of the valve manufacturers quote flow coefficient cv for us gal/min for psi at 60degrees. Please contact us if the fluid specification requires viscosity correction. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate. 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 below cv values are used to give an indication of flow rates for ball valves. The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. This calculator can be used to help select a valve with enough flow capacity for a given application. This depends on how the valve has been designed to let the flow going through the valve.

In industry the popular terms for full port is full bore. Select a nominal valve size from the cv charts based on the calculated cv. 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. Since we're having issues with the ball valve i wanted to compare what the effect would be with a plug valve. Ball valves are an important part of the process industries. 216 ball valve type 21, type 21α / water ball valve 3 way ball valve type 23 0 50 100 cv value (%) opening degree (%) 0 10 20 30 40 50 60 70 80 90 100 resultant Therefore, the main differences between different flow coefficients come from the type of valve, and of course the opening position of the valve. The cv rating for each valve is listed in the tables found in the valve catalog. In the chart below, we show the approximate cv value of butterfly valves ranging from 2 to 24 and at various disc angles. Flow coefficient c v ——it is the full capacity flow rate through the valve in us gallons/min. Full port valves will have a higher cv than reduced port valves. 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 coefficient of flow or cv value of ball valves is the number of us gallons of water the valve will pass with a differential pressure of 1 psi through the valve at 60°f. Both values are found in the cv charts supplied on the following pages. The valve flow coefficient, cv, is the number of u.s.

Flow coefficients can be found in the cv column within the ball valve dimensional data tables. 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. Butterfly valve cv values vary with the disc angle and valve size. A conventional ball valve is normally not used as a throttling valve since a partial flow will create high velocity flow tear at the ball and the seal. Such as the renault number (reynolds number), flow rate (flow), the shock (choking), the involved joints in pipes (fitting) and the other by the values of these. First question is k dimensionless and the same value for calculations in us gallons/minte and litres/min.

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