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Cv to GPM Formula:
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The Cv to GPM conversion calculates the flow rate in gallons per minute (GPM) through a valve or other flow restriction based on its flow coefficient (Cv), pressure drop (ΔP), and the specific gravity (SG) of the fluid.
The calculator uses the formula:
Where:
Explanation: The formula calculates the flow rate in gallons per minute based on the valve's flow capacity and the pressure conditions.
Details: This conversion is essential for sizing valves, selecting appropriate flow control components, and designing hydraulic systems in various industries including water treatment, chemical processing, and HVAC systems.
Tips: Enter the flow coefficient (Cv), pressure drop in psi, and specific gravity of the fluid. All values must be positive numbers (Cv > 0, ΔP > 0, SG > 0).
Q1: What is the flow coefficient (Cv)?
A: Cv is a dimensionless number that represents the flow capacity of a valve. It's defined as the number of US gallons per minute of water that will flow through the valve with a pressure drop of 1 psi.
Q2: How does specific gravity affect the calculation?
A: Specific gravity accounts for the density of the fluid relative to water. Heavier fluids (SG > 1) will have lower flow rates at the same pressure drop, while lighter fluids (SG < 1) will have higher flow rates.
Q3: Can this formula be used for gases?
A: This specific formula is primarily designed for liquids. Gas flow calculations typically require different formulas that account for compressibility and other gas-specific properties.
Q4: What is a typical Cv value range?
A: Cv values can range from less than 1 for small valves to over 1000 for large industrial valves, depending on the valve size and design.
Q5: How accurate is this calculation?
A: The calculation provides a theoretical flow rate. Actual flow rates may vary due to factors like valve design, fluid viscosity, temperature, and system conditions.