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Jan30-09, 09:06 PM
The equation given is generally correct as long as there is no choking, and the flow is laminar.
The ISA standard S75.01.01 gives extensive information on the subject. Also, the valve manufacturer should provide sizing information that will take that into account.
ooops I meant to say the flow must be TURBULENT.
I've never heard of a restriction on the flow being turbulent for that equation to be valid. Where did you reference that from?