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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 Valves in Series

Control valves in series - flow coefficient

The equivalent flow coefficient Kv or Cv for two control valves installed in series can be calculated as

1 / (Kvt)2 =  1 / (Kv1)2 + 1 / (Kv2)2                                       (1)


Kvt = resulting Kv

Kv1 = Kv valve 1

Kv2 = Kv valve 2

Control Valves in Parallel

Control valves in parallel - flow coefficient

The equivalent Kv or Cv for two control valves installed in parallel can be calculated as

Kvt = Kv1 + Kv2                                            (2)

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  • Engineering ToolBox, (2008). Control Valves - Adding Flow Coefficients for Valves in Series or Parallel. [online] Available at: [Accessed Day Mo. Year].

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