CV Flow Calculator:
Enter the values of flow rate, Q(GPM), Specific Gravity, SG and Pressure Drop, P(psi) to determine the value of Flow Coefficient, CV.
CV Flow:
The flow coefficient, commonly denoted as CV, is a measure of the capacity of a valve or other flow device to allow fluid to flow through it. It represents the number of gallons of water per minute (GPM) that can pass through a valve with a pressure drop of 1 psi at 60°F. A higher CV value indicates a valve that allows more flow, while a lower CV indicates greater restriction.
CV is used extensively in the selection and sizing of valves, pumps, and other flow-related equipment in various industrial applications. It takes into account the flow rate, specific gravity of the fluid, and pressure drop across the valve. The flow coefficient is dimensionless and applies to both gases and liquids, though gas calculations may include additional correction factors.
Understanding CV helps engineers and technicians ensure proper system performance, reduce energy losses, and avoid under-sizing or over-sizing components. It also plays a key role in maintaining system efficiency, safety, and regulatory compliance.
The CV value depends on various factors including valve size, design, internal geometry, and the type of fluid being transported. Accurate CV values are determined through standard testing and are typically provided by manufacturers in technical specifications.
Regular assessment of CV requirements ensures optimal control, especially in systems where varying flow rates and pressures are encountered. Properly matched CVs ensure accurate flow control and energy efficiency in a fluid system. The CV formula is widely used in chemical, petroleum, water treatment, and HVAC systems.
Flow Coefficient, CVequals the flow rate, Q(GPM)in gallons per minute multiplied by the square root of Specific Gravity, SG divided by Pressure Drop, P(psi) in pounds per square inches.
Flow Coefficient, CV = Q(GPM)* √(SG / P(psi))
CV = flow coefficient.
Q(GPM)= flow rate in gallons per minute, GPM.
SG = specific gravity.
P(psi)= pressure drop in pound per square inches, psi.
CV Flow Calculation:
A system has a flow rate of 50 GPM, a specific gravity (SG) of 0.9, and a pressure drop (P) of 4 psi. Find the flow coefficient (CV).
Given: Q(GPM)= 50GPM, SG = 0.9, P(psi)= 4psi.
Flow Coefficient, CV = Q(GPM)* √(SG / P(psi))
CV = 50 * √(0.9 / 4)
CV = 50 * √0.225
CV = 50 * 0.4743
CV = 23.71.
A valve has a flow coefficient (CV) of 40, the specific gravity (SG) of the fluid is 1.2, and the pressure drop (P) is 3 psi. Find the flow rate (Q).
Given: CV = 40, SG = 1.2, P(psi)= 3psi.
Flow Coefficient, CV = Q(GPM)* √(SG / P(psi))
Q(GPM)= CV / √(SG / P(psi))
Q(GPM)= 40 / √(1.2 / 3)
Q(GPM)= 40 / √0.4
Q(GPM)= 40 / 0.6325
Q(GPM)= 63.26GPM.