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)
