This calculator can be used to help select a valve with enough flow capacity for a given application. Cv 48000 248 33 03 x sqrt 0 86 x 273 240.
It is a number published by the valve manufacturer that describes the number of u s.
Cv value for air valves. In more practical terms the flow coefficient c v is the volume in us gallons of water at 60 f that will flow per minute through a valve with a pressure drop of 1 psi across the valve. Density 0 86 air 1. Cv 25 gpm 1 1 psi 1 2.
Please note that for gases e g. What is butterfly check valve. Amount of flow m3 hour of water of 20 c in a valve with a pressure loss of 1 bar.
Cv the coefficient of flow is one standard for expressing the flow capacity of devices used in a pneumatic system. Gallons that can pass through a valve in a fully open position at a pressure drop of 1 psi. It is defined as the flow rate in us gallons per minute gpm of water at a temperature of 60º fahrenheit with a pressure drop across the valve of 1 psi.
Because the fluid is a gas and δp p1 2 so we will use the formula. Types of control valves noise. Many manufacturers around the world have adopted cv as the standard value to express the flow capacity of their components.
Includes 53 different calculations. 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. Online calculator to quickly determine valve and orifice cv kvs values for air.
The amount of flow of a fluid through a solenoid valve can easily be calculated with flow coefficient kv. Control valve tips and tricks. Air a different formula is used see correction factor gases below.
What is flow coefficient cv. C v calculator for valve sizing. Equations displayed for easy reference.
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. Diaphragm solenoid valve principle. 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 is applied across the valve.
The valve flow coefficient cv is the number of u s. It is commonly understood that nearly every pneumatic device creates a flow restriction in the system. The metric equivalent of cv is kv which is defined as the amount of water that will flow in m3 hr with 1bar pressure drop.
Articles you may like. The use of the flow coefficient offers a standard method of comparing valve capacities and sizing valves for specific applications that is widely accepted by industry. The cv tells you how to properly size your valve so it has minimal effect on the hydraulic efficiency you ve engineered into your system.
Cv is the flow coefficient in imperial units. Valve technician interview questions.