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control valves: supply or return
On large commercial hw systems I have seen control valves on either supply or return of heat transfer units.
On hw re-heat coils in the ductwork the cv's seem to favor the return, but on fintube baseboard I usually see them on the supply. What is the primary reason for the cv location on hydronic heating systems?
Do engineers differ in opinion on whether it is beneficial to locate the cv on the supply or return? Are there other reasons for the placement of cv's?