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Differential Pressure GPM Formula:
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The Differential Pressure GPM calculation determines the flow rate in gallons per minute through a valve or orifice based on the pressure differential across it, the flow coefficient (Cv), and the specific gravity of the fluid.
The calculator uses the formula:
Where:
Explanation: The formula calculates the flow rate based on the square root relationship between pressure drop and flow rate through a restriction.
Details: Accurate flow rate calculation is essential for valve sizing, system design, pump selection, and ensuring proper fluid system operation in various industrial applications.
Tips: Enter the flow coefficient (Cv), differential pressure in psi, and specific gravity of the fluid. All values must be valid positive numbers.
Q1: What is the flow coefficient (Cv)?
A: Cv is a dimensionless number that represents the flow capacity of a valve - the number of gallons per minute of water that will flow through the valve with a 1 psi pressure drop.
Q2: How does specific gravity affect the calculation?
A: Higher specific gravity fluids (denser than water) will have lower flow rates for the same pressure differential, while lighter fluids will have higher flow rates.
Q3: What are typical Cv values?
A: Cv values range from less than 1 for small valves to several hundred for large industrial valves, depending on valve size and design.
Q4: When is this calculation most accurate?
A: This calculation is most accurate for turbulent flow conditions and for Newtonian fluids with consistent properties.
Q5: Are there limitations to this formula?
A: The formula assumes ideal conditions and may need adjustment for highly viscous fluids, non-Newtonian fluids, or complex flow geometries.