Valve Pressure Drop to Flow
Convert with explicit units, definitions and assumptions.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Use the valve manufacturer’s Cv. Incompressible, nonchoked liquid model; not valid for gas, flashing, cavitation or as a general pipe-network flow solver.
Example Calculation
- Pressure drop: 4 psi
- Valve flow coefficient Cv: 5
- Specific gravity: 1
Cv=5, pressure drop 4 psi and specific gravity 1 gives 10 US gpm.
Frequently asked questions
How do I use this calculator?
Enter pressure drop, valve flow coefficient cv, specific gravity. The result updates automatically. Use Reset to restore the example values.
What method does it use?
US gpm = Cv × √(pressure drop / specific gravity). Use the valve manufacturer’s Cv. Incompressible, nonchoked liquid model; not valid for gas, flashing, cavitation or as a general pipe-network flow solver.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.