Download your Word document
Control-Valve Cv Requirement Calculator result sheet — free, supported by sponsors. Your download button appears in 20 seconds.
This free download is supported by sponsors — continuing in
20
Your file is generated in your browser when you choose Download — nothing is uploaded. If this calculator returns enough numeric data, the export also includes its best-fit chart alongside the readable table.
WorldCalculate result export
Control-Valve Cv Requirement Calculator — result sheet
Compare required and rated liquid valve Cv from target flow, pressure drop, and specific gravity.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Required Cv = Q√(SG/ΔP); predicted liquid flow = rated Cv√(ΔP/SG), using Q in US gal/min and ΔP in psi.
A valve flow coefficient relates liquid flow to pressure drop and specific gravity under a defined convention. This page calculates the Cv implied by a target and compares it with a candidate rated Cv without selecting a valve or hiding the unit basis.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Target liquid flow — US gal/min; minimum 1.0E-6; maximum 1000000000
- Valve pressure drop — psi; minimum 1.0E-6; maximum 100000000
- Liquid specific gravity — relative; minimum 1.0E-6; maximum 1000000
- Candidate rated Cv — Cv; minimum 0; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Target liquid flow | 20 |
| Valve pressure drop | 10 |
| Liquid specific gravity | 1 |
| Candidate rated Cv | 20 |
Required Cv is about 6.3246; the rated Cv predicts 63.2456 US gal/min, or about 14.365 m³/h, at the entered pressure drop.
Assumptions and limits
- The flow is a liquid and uses the common US Cv convention with US gallons per minute and psi.
- Specific gravity is relative to the reference used by the selected coefficient convention.
- The pressure drop is across the valve and is positive.
- The candidate rated Cv is treated as a reference capacity at the entered condition, not as a guaranteed installed flow.
- Gas, flashing, cavitation, viscosity correction, trim characteristic, noise, and choked flow are not modeled.
- The result is a comparison screen and not an installation, sizing, or 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.
No saved result was found. Please run the calculation first, then choose Download again.