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Flow Coefficient Cv vs. Flow Factor Kv

Comparing flow coefficients Cv to flow factors Kv.

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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 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)

Download and print Flow Coefficient - Cv vs. Kv chart

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