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The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate .
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: C v = (25 gpm) (1 / (1 psi)) 1/2
Valve Flow Coefficient (Cv) is a valve’s capacity for a liquid or gas to flow through it. It is technically defined as “the volume of water at 60°F (in US gallons) that will flow through a valve per minute with a pressure drop of 1 psi across the valve.”
The Valve Coefficient or Flow Coefficient of a valve is a convenient method to relate flow rates to the pressure drop. It provides a relative measure of the efficiency of a valve. The valve coefficient is usually denoted by Cv.
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 pressure, and fluid temperature.
varies with both size and style of valve, but provides an index for comparing liquid capacities of different valves under a standard set of conditions. To aid in establishing uniform measurement of liquid flow capacity coefficients (C v) among valve manufacturers, the Fluid Controls Institute (FCI) developed a standard test piping arrangement,
Valve Flow Coefficient (Cv) is defined as the volume of water at 60°F that will flow through a fully open valve with a pressure differential of 1 psi.
The Flow Coefficient (Cv) is a measure of the flow capacity of a valve, defined as the volume of water at 60°F (in US gallons) that will flow through it per minute with a pressure drop of 1 psi across the valve.
Comparing flow coefficients Cv to flow factors Kv. The flow coefficient - Cv - or the flow factor - Kv - are commonly used to specify capacities of control valves. Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators, positioners and more.
In water treatment plants, the valve flow coefficient aids in ensuring that valves can handle the required water flow without causing significant pressure drops. In the pharmaceutical industry, it is crucial in maintaining precise flow rates to ensure product quality.