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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

• Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.
• Control Valves - Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners
• Fluid Mechanics - The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
• Process Control - Instrumentation and process control systems - design and documentation.
• Control Valves and Equipment - Sizing and dimensions of control valves & equipment in steam and condensate systems.
• Piping Systems - Dimensions of pipes and tubes, materials and capacities, pressure drop calculations and charts, insulation and heat loss diagrams.
• Pipe Sizing - Sizing of steam and condensate pipe lines - pressure loss, recommended velocity, capacity and more.

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Temperature

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Length

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km
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yards
miles
naut miles

Area

m2
km2
in2
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miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

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ft/min
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mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
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US gpm
cfm

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