It is a common practice to use 1 size lower than the line size.
This must be based on what ever lower size that one may go from the line size limited by what ever flow coefficient that the valve may have. This is again dependent on the pressure drop allowances that were made at line sizing.
Sajit
[Non-text portions of this message have been removed] Received on Mon Jan 01 17:13:00 2007
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