Adding Kv or Cv values

Adding Kv or Cv when control valves are in series or parallel

control valves in parallel

The resulting Kv or Cv if two valves are installed in parallel can be calculated as

Kv_t = Kv₁ + Kv₂ (1)

where

Kv_t= resulting Kv

Kv₁= Kv valve 1

Kv₂= Kv valve 2

control valves series

The resulting Kv or Cv if two valves are installed in series can be calculated as

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