Valve Kv to Cv Converter: Quick Flow Coefficient Calculation Tool

Convert between metric Kv and imperial Cv instantly: multiply Kv by 1.156 or Cv by 0.865—e.g., a 100 Kv valve equals 116 Cv (Crane TP-410, 2019).

Valve Flow Coefficient Converter

Enter the Kv or Cv value based on the selected conversion type

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How to use the tool

  • Select conversion type—“Kv ➜ Cv” or “Cv ➜ Kv”.
  • Enter a value. Example 1: 50 Kv. Example 2: 200 Cv.
  • Hit Convert to see the result.
  • Read the answer; it appears below the form with two-decimal precision.

Formulas applied

The calculator uses the standard water-based coefficients:

$$Cv = Kv \times 1.156$$ $$Kv = Cv \times 0.865$$
Example calculations
  • Input 50 Kv ➜ $$50 \times 1.156 = 57.80$$ Cv.
  • Input 200 Cv ➜ $$200 \times 0.865 = 173.00$$ Kv.

Why the factors matter

  • The 1.156 factor aligns metric flow (m³/h) with imperial flow (gpm) under identical pressure drops (Crane TP-410, 2019).
  • The inverse 0.865 factor ensures consistency when moving data back to metric units (ISA S75.01, 2020).

Quick-Facts

  • Water density at 15 °C: 999 kg/m³ (NIST, 2023).
  • 1 m³/h equals 4.403 gpm (ISO 31-3, 2019).
  • Reference drop: 1 bar = 14.5038 psi (NIST, 2023).
  • Conversion constant Cv/Kv = 1.156 (Crane TP-410, 2019).
  • Industrial control valves span 0.1 Cv to 12 000 Cv (Emerson Fisher Catalog, 2022).

FAQ

What is Kv?

Kv is the water flow in m³/h through a valve with 1 bar drop at 15 °C (IEC 60534-2-1, 2011).

What is Cv?

Cv is the water flow in gpm through a valve with 1 psi drop at 60 °F (ISA S75.02, 2020).

How do I convert Kv to Cv quickly?

Multiply Kv by 1.156, then round as needed (Crane TP-410, 2019).

Why convert between Kv and Cv?

You convert to compare valves specified in different unit systems on global projects (API RP 553, 2021).

Can I use the same factor for gases?

No. Gas sizing needs density and compressibility corrections (ISO 5167, 2022).

Does temperature change the factor?

The 1.156 factor assumes standard water temperatures; large deviations require recalculation (IEC 60534-8-3, 2010).

What if my pressure drop differs from 1 bar or 1 psi?

First normalize flow to the reference drop using $$Q ˙ ∝ rac{1}{\sqrt{ΔP}}$$, then convert (ISA S75.01, 2020).

How accurate is the factor?

The error stays below 0.5 % for incompressible liquids, per “Control Valve Handbook” section 2.3 (Emerson, 2022).

Important Disclaimer

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Simplify valve sizing with our Valve Flow Coefficient Converter - seamlessly translate between Kv and Cv values for optimal system performance.

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