Reviewed By: Patrick Myers (BSME)
Enter the valve flow coefficient (CV) and the pressure differential (PSI) into the GPM from CV Calculator. The calculator will evaluate the GPM from CV.
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GPM from CV Formula
The following two example problems outline the steps and information needed to calculate the GPM from CV.
GPM = CV * SQRT (P/SG)
Variables:
- GPM is the GPM from CV (gallons per minute)
- CV is the valve flow coefficient (CV)
- P is the pressure differential (PSI)
- SG is the specific gravity of the liquid (1 for water).
To calculate GPM from CV, multiply the valve coefficient by the square root of the pressure differential.
| Cv (unitless) | Flow (GPM) |
|---|---|
| 0.5 | 0.500 |
| 0.75 | 0.750 |
| 1 | 1.000 |
| 1.5 | 1.500 |
| 2 | 2.000 |
| 3 | 3.000 |
| 4 | 4.000 |
| 5 | 5.000 |
| 7.5 | 7.500 |
| 10 | 10.000 |
| 12 | 12.000 |
| 15 | 15.000 |
| 20 | 20.000 |
| 25 | 25.000 |
| 30 | 30.000 |
| 40 | 40.000 |
| 50 | 50.000 |
| 75 | 75.000 |
| 100 | 100.000 |
| 150 | 150.000 |
| * Rounded to 3 decimals. US customary: Q (GPM) = Cv × √(ΔP/SG). With SG = 1.00 and ΔP = 1 psi, Q = Cv. | |
How to Calculate GPM from CV?
The following steps outline how to calculate the GPM from CV.
- First, determine the valve flow coefficient (CV).
- Next, determine the pressure differential (PSI).
- Next, gather the formula from above = GPM = CV * SQRT (P).
- Finally, calculate the GPM from CV.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
valve flow coefficient (CV) = 2.5
pressure differential (PSI) = 30
GPM = CV * SQRT (P) = ?
