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# Control Valves - Adding Flow Coefficients for 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 Valve Sizing

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

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