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# Flow Coefficient Cv vs. Flow Factor Kv

## Comparing flow coefficients Cv to flow factors Kv.

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 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 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)

## Related Topics

• ### Control Valves

Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners
• ### Control Valves and Equipment

Sizing and dimensions of control valves & equipment in steam and condensate systems.
• ### Fluid Mechanics

The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
• ### Pipe Sizing

Sizing of steam and condensate pipe lines - pressure loss, recommended velocity, capacity and more.
• ### Piping Systems

Dimensions of pipes and tubes, materials and capacities, pressure drop calculations and charts, insulation and heat loss diagrams.
• ### Process Control

Instrumentation and process control systems - design and documentation.
• ### Steam and Condensate

Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.

## Related Documents

• ### Ball Valves - Flow Coefficients Cv

Flow coefficients - Cv - for typical ball valves - reduced and full bore.
• ### Butterfly Valves - Flow Coefficients Cv

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.
• ### Liquid, Steam and Gas - Flow Coefficients Cv

Calculate flow coefficients for the design of control valves - Imperial units.
• ### Liquid, Steam and Gas - Flow Factor Kv

Calculate flow factor Kv for liquids, steam and gases - metric units.
• ### Straight Through Diaphragm Valves - Flow Coefficients

Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves.
• ### Technical Terms in Fluid Mechanics

Some commonly used technical terms in fluid mechanics.
• ### Water Control Valves - Flow Factor Kv Diagram

Sizing of water control valves - SI units
• ### Water Control Valves - Kv Calculation

Designing water process control valves and their Kv values.
• ### Water Control Valves - Flow Coefficient Cv Diagram

Sizing of water control valves - Imperial units.
• ### Weir Diaphragm Valves - Flow Coefficients and Flow Factors

Typical flow coefficients - Cv - and flow factors - Kv - for weir diaphragm valves.

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## Citation

• The Engineering ToolBox (2003). Flow Coefficient Cv vs. Flow Factor Kv. [online] Available at: https://www.engineeringtoolbox.com/flow-coefficient-factor-d_238.html [Accessed Day Month Year].

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9.19.12