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  1. bthompson

    Use of Cv for Valves in Gas Application

    Thanks again for all the responses TD2K and for the new offer from RobV. I'm at bthompson@helixtechnology.com I really appreciate your help. If you guys ever have any questions about Cryogenics (not freezing people :)) or high vacuum pumping (molecular flow only) or industrial diaphragm or...
  2. bthompson

    Use of Cv for Valves in Gas Application

    Thanks again TD2K. And thanks to davefitz. I am very pleased with this forum. I will check into the ISA Handbook of control valves. Does anyone else out there know of a derivation of "Cg", as described by TD2K and as evidently is used by Fisher?? TD2K: I'm sure I do not have a...
  3. bthompson

    Use of Cv for Valves in Gas Application

    Thank you TD2K. This makes sense. I do have an understanding of the pressure drop range and the max operating pressure requirement. And, of course I'm using good old ROOM temp. All that stuff, along with a flow requirement, I think specifies what I need in terms of orifice size (this is a...
  4. bthompson

    Use of Cv for Valves in Gas Application

    I have found specifications for valves (internal) where the Cv value of the valve is specified and the valve is almost exclusively used for gas application (dry Nitrogen). I haven't worked on this stuff for a while, so I reviewed the derivation of the classic Cv equation. This derivation...

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