Flow Coefficient C V Vs. Flow Factor K V - The Engineering ToolBox

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The flow coefficient - Cv - or the flow factor - Kv - are commonly used to specify capacities of control valves.

Flow Coefficient - Cv

It is often convenient to express the capacity and flow characteristic of a control valve in terms of the

• Flow Coefficient - Cv

The flow coefficient - Cv - is based on the imperial units system and is defined as:

• the flow of water through a valve at 60 oF in U.S. gallon/minute at a pressure drop of 1 lb/in2

• Water Control Valves - flow coefficient Cv diagram

The flow coefficient is commonly used in the U.S.

Flow Factor - Kv

The metric equivalent of the flow coefficient - Cv - is based on the SI-system and is called the

• Flow Factor - Kv

The flow factor - Kv - is defined as

• the flow of water with temperature ranging 5 - 30 oC through a valve in cubic meters per hour (m3/h) with a pressure drop of 1 bar

• Water Control Valves - Kv Flow Coefficient Diagram

The flow factor is commonly used outside U.S.

Converting between Flow Coefficient Cv and Flow Factor Kv

The relationship between Cv and Kv can be expressed as:

Cv = 1.16 Kv (1)

Kv = 0.862 Cv (2)

Download and print Flow Coefficient - Cv vs. Kv chart

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Related Documents

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Flow coefficients - Cv - for typical ball valves - reduced and full bore.

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Typical flow coefficients - Cv - for butterfly valves.

Control Valves - Adding Flow Coefficients for Valves in Series or Parallel

How to add flow coefficients for control valves in series or parallel.

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Control valve sizing and pressure drop calculations for water flow applications. Different valve types, Kv flow coefficients, and how to select the right valves.

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Water Control Valves - Flow Factor Kv Diagram

Sizing of water control valves - SI units

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Unit Converter

Temperature oC K oF

Length m km in ft yards miles naut miles

Area m2 km2 in2 ft2 miles2 acres

Volume m3 liters in3 ft3 us gal

Weight kgf N lbf

Velocity m/s km/h ft/min ft/s mph knots

Pressure Pa bar atmosphere mm H2O kg/cm2 psi inches H2O

Flow m3/s m3/h US gpm cfm

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