My European affiliates have asked several times for Zeta values. It is supposed to be some sort of flow restriction index, but unlike the inverse of a Cv value, Zeta can be the same value for different sizes of valves. 

Can someone please enlighten me as to the definition of Zeta, and how I might tabulate it?

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http://www.tycovalves-pc.com/ld/F86%20_8_99.pdf


This product brochure for a typical check valve explians it.

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