How do you calculate flow rate on Cv?
The volume flow rate for liquids can be calculated by multiplying the fluid velocity times the flow area. Thus, Cv is numerically equal to the number of U.S. gallons of water at 60°F that will flow through the valve in one minute when the pressure differential across the valve is one pound per square inch.
What is the equation for Cv?
The formula for the coefficient of variation is: Coefficient of Variation = (Standard Deviation / Mean) * 100. In symbols: CV = (SD/x̄) * 100.
Is KV same as Cv?
The Relationship between Cv and Kv is Cv = 1.156 Kv OR Kv = 0.864 Cv.
What is KV and Cv?
Kv is the flow coefficient in metric units. Cv is the flow coefficient in imperial units. It is defined as the flow rate in US Gallons per minute [gpm] of water at a temperature of 60� fahrenheit with a pressure drop across the valve of 1 psi.
What is Cv flow capacity?
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.”
How do you calculate Cv in chemistry?
The specific heat of gas at constant volume in terms of degree of freedom ‘f’ is given as: Cv = (f/2) R. So, we can also say that, Cp/Cv = (1 + 2/f), where f is degree of freedom. Monoatomic gas has only one translational motion, hence three translational degrees of freedom.
How do you calculate Cv valves?
Cv by definition is the number of gallons per minute (GPM) a valve will flow with a 1 psi pressure drop across the valve. For example a valve with a Cv of 10 will flow 10 GPM with a 1 psi pressure drop. The formula used to select the valve Cv with the specified differential pressure is: Cv=GPM/((SQ RT(∆P)).
What is Cv in flow of liquid or gas?
What does Cv stand for in control valve?
Valve Flow Coefficient (Cv) is the flow capability of a control valve at fully open conditions relative to the pressure drop across the valve. It is defined as the volume of water (GPM in the US) at 60°F that will flow through a fully open valve with a pressure differential of 1 psi across the valve.
What is Cv value in statistics?
The coefficient of variation (CV) is the ratio of the standard deviation to the mean. The higher the coefficient of variation, the greater the level of dispersion around the mean. It is generally expressed as a percentage. The lower the value of the coefficient of variation, the more precise the estimate.
What is the formula for the annular velocity?
The formula for the Annular Velocity is : AV = 24.5 ft gal⋅in2 ⋅ Q Dh2 −Dp2 A V = 24.5 ft g a l ⋅ in 2 ⋅ Q D h 2 – D p 2
How do you calculate Cv flow coefficient of a valve?
Cv Flow Coefficients: The Cv flow coefficient of a control valve can be calculated from the flow rate and the pressure drop through the valve. For liquids other than water the ratio of the fluid density to the density of water must also be used in the calculation.
What is the formula for liquid flow?
FORMULAS AND EXAMPLES:* 1 . Liquid Flow Formulas: Cv = QL SL QL = Cv ∆P ∆P SL Example: Determine liquid flow (assume water) through a regulator in gallons per minute with the following conditions: Given: P 1 = 1000 psia . P 2 = 600 psia . SL = 1 .0 Cv = .08 QL = Cv ∆P = 0 .8 1000-600 = 0 .8x 20 SL 1 1
How do you calculate the flow coefficient of water?
For liquids the flow coefficient – Cv -is expressed with water flow capacity in gallons per minute (GPM) of 60oF with pressure drop 1 psi (lb/in2). Flow expressed by volume Cv = q (SG / dp)1/2 (1)