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Engineering ToolBox > Flow Coefficient Cv and Flow Factor Kv
The flow coefficient - Cv - and the flow factor - Kv - are commonly used to specify the capacit of control valves.
It is often convenient to express the capacities and flow characteristics of control valves in terms of the
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.
The metric equivalent of the flow coefficient - Cv - is based on the SI-system and is called the
The flow factor - Kv - is defined as
The flow factor is commonly used outside U.S.
The connection between Cv and Kv can be expressed as: