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The k v factor of a valve indicates the water flow in m 3 /h, at a pressure drop across the valve of 1 kgf /cm 2 when the valve is completely open. The following formula is often used using a fluid’s specific gravity (g) where the relationship to water density is already considered. The process of valve size selection, the same formula is used determine the valve cv necessary for a required flow rate and desired pressure drop. Scfm air flow through a valve orifice having a cv factor of 1.00 The equations below can be used to determine:
Cv Factor For Valves. “cv” is a term constantly used in selecting valves. The process of valve size selection, the same formula is used determine the valve cv necessary for a required flow rate and desired pressure drop. 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. The full closure curve of a ball valve is then the above graph multiplied by the valve’s flow coefficient or factor.
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And they allow the designer to predict with reasonable accuracy just how a newly designed system will perform. The definition of cv is the # of gallons of water that will flow through the valve with a 1 psi pressure differential when the valve is open. For example, a valve with cv of 4.00 will pass 4 times as much flow at the same pressure difference as shown in the chart. Butterfly valve cv values vary with the disc angle and valve size. Gallons per minute that will pass through a valve with a pressure drop of (1) psi. However, there is a problem with using this equation in pneumatic applications.
8.30 x 12 x 6.4 x.048 cv = 1 x 28.8 = 1.06 any valve, therefore, which has a cv of at least 1.06, will extend our cylinder the specified distance in the required time.
Cv is the amount of flow in gallons per minute through a valve which results in a 1 psi pressure drop. Cv vs angle closure curve values table. 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. This calculator can be used to help select a valve with enough flow capacity for a given application. Contrast this with the resistance factor k (the one used for pipe fittings like bends etc). 6.4 “a” constant for 80 psi, from table 2.
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Liquid critical pressure ratio factor, f f the liquid critical pressure. The diagram below is a nice tool to simplify the conversion between the different coefficients. They provide a means of comparing the flow capacities of different brands of valves; Full port valves will have a higher cv than reduced port valves. The below cv values are used to give an indication of flow rates for ball valves.
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A valve with a high cv passes fluid more easily than one with a low cv. A valve with a high cv passes fluid more easily than one with a low cv. Thus they tend to choke (or cavitate) at smaller pressure drops than globe valves. The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities. 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.
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Kv = 0.864 cv at a particular percentage of opening of valve giving cv = 1 will pass 1us gpm ( at 60 °f) and a pressure differential of 1 psi upstream and downstream across the valve. The conversion factor between two coefficients is indicated with arrows. C v & flow calculator. Converting between flow coefficient c v and flow. Because air is compressible, cv must have additional factors built into the equations to compensate for that compressibility.
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Q = cv x δp x 62.4 d the formula above utilizes a conversion factor of 62.4 which is the density of water in lbs/ft³. It applies to the factor of the head drop (δh) or pressure drop (δp) over a valve with the flow rate q. The definition of cv is the # of gallons of water that will flow through the valve with a 1 psi pressure differential when the valve is open. For the same pressure conditions, if we increase the valve opening to create cv = 10, it will pass 10 us gpm provided 1 psi pressure drop across the valve (remains same). The cv value of.0141 is reached at approximately turn 2.3, while the cv value of.0703 is reached at approximately turn 14.6.
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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. 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. And if cv factor is same, flow rate is big so that differential pressure is big. Kv = 0.864 cv at a particular percentage of opening of valve giving cv = 1 will pass 1us gpm ( at 60 °f) and a pressure differential of 1 psi upstream and downstream across the valve. On valves or orifices with other cv factors, the flow capacity will be directly proportional to the cv rating.
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It can be assumed that the tests are done with water (unless otherwise noted), using a specific gravity of 1.0, 1.2 centistoke viscosity, and a standard temperature of 60 degrees fahrenheit. 6.4 “a” constant for 80 psi, from table 2. Cv factor is using generally, it is expressed factor for fluid 60°f that flow into valve by us gal/min. The following formula is often used using a fluid’s specific gravity (g) where the relationship to water density is already considered. Scfm air flow through a valve orifice having a cv factor of 1.00
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The equations below can be used to determine: The cv factor is the number of u.s. And they allow the designer to predict with reasonable accuracy just how a newly designed system will perform. Flow coefficient is an imperial measurement and is defined as: 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.
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Scfm air flow through a valve orifice having a cv factor of 1.00 It can be assumed that the tests are done with water (unless otherwise noted), using a specific gravity of 1.0, 1.2 centistoke viscosity, and a standard temperature of 60 degrees fahrenheit. Gallons per minute that will pass through a valve with a pressure drop of (1) psi. The conversion factor between two coefficients is indicated with arrows. The cv factor is the number of u.s.
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Q = cv x δp g likewise, cv for particular flow characteristics can be determined from 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. It applies to the factor of the head drop (δh) or pressure drop (δp) over a valve with the flow rate q. The following formula is often used using a fluid’s specific gravity (g) where the relationship to water density is already considered. The cv factor is the number of u.s.
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The definition of cv is the number of gpm (gallons per minute ) that will pass through the control valve with a pressure drop of 1psi. The diagram below is a nice tool to simplify the conversion between the different coefficients. 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 And they allow the designer to predict with reasonable accuracy just how a newly designed system will perform. 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.
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A valve with a high cv passes fluid more easily than one with a low cv. Because air is compressible, cv must have additional factors built into the equations to compensate for that compressibility. Liquid critical pressure ratio factor, f f the liquid critical pressure. For the same pressure conditions, if we increase the valve opening to create cv = 10, it will pass 10 us gpm provided 1 psi pressure drop across the valve (remains same). Butterfly valve cv values vary with the disc angle and valve size.
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