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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.

### Control Valves in Series

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)

where

Kvt = resulting Kv

Kv1 = Kv valve 1

Kv2 = Kv valve 2

### Control Valves in Parallel

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

Kvt = Kv1 + Kv2                                            (2)

## Related Topics

• ### Control Valves

Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners

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## Citation

• The Engineering ToolBox (2008). Control Valves - Adding Flow Coefficients for Valves in Series or Parallel. [online] Available at: https://www.engineeringtoolbox.com/adding-kv-cv-d_1120.html [Accessed Day Month Year].

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