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Re:Nupro Needle Valves
I have the current catalog sheets on the Nupro Needle (metering)
valves and I thought I should share some of the relevant information.
The M series have a maximum Cv(flow coefficient) of .03 with an
orifice of 1.42mm while the S series have a maximum Cv of .004 with an
orifice of .81mm. It would seem the S series would be the valves to
choose. The 4mg2 has a ¼ " male nps connection and the 4mg is a ¼"
Swagelok connection. In the S series SS4 is the ¼" Swagelok
connection and SS-SVR4 is a ¼" male VCR connection. Both series
come in stainless steel and brass - I don't know which would be
cheaper.