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
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)
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