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Valve Flow Coefficient (Cv) Calculator — result sheet
Estimate liquid flow from a valve flow coefficient, pressure drop, and specific gravity.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Q_gpm = Cv × √(ΔP_psi/SG).
The liquid Cv relation estimates flow in US gallons per minute from the valve coefficient, pressure drop, and liquid specific gravity, then provides metric conversions.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Valve flow coefficient Cv — minimum 1.0E-6; maximum 1000000000
- Pressure drop — psi; minimum 1.0E-6; maximum 1000000000
- Specific gravity — minimum 1.0E-6; maximum 1000
Worked example
| Input | Value |
|---|---|
| Valve flow coefficient Cv | 12 |
| Pressure drop | 10 |
| Specific gravity | 1 |
Estimated flow is 37.95 US gal/min, or about 143.65 L/min.
Assumptions and limits
- The entered Cv follows the common liquid-water reference convention and pressure drop is positive in psi.
- Specific gravity is dimensionless and the liquid is treated as incompressible; gas sizing, flashing, cavitation, viscosity correction, and valve travel are not modeled.
- The result is an estimate for a stated valve condition and is not a piping, relief, or process-safety approval.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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