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CV RATING

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Rob_15
Rob_15 Member Posts: 8
in THE MAIN WALL
I have a question reguardng cv ratings.I do not quite understand how to size items properly (mixing valve etc).
If someone can explain it I would greatly appreciate it.

Comments

  • Tim Doran_2
    Tim Doran_2 Member Posts: 131
    Finding the pressure drop

    When the Cv is known and the desired flow is known the pressure drop in ft/hd is found by (flow/Cv)^2*2.31

    Tim D.
  • Alan(CaliforniaRadiant)Forbes
    Alan(CaliforniaRadiant)Forbes Member Posts: 1,243
    From a

    previous thread:

    DATE: Apr 23, 2001
    SUBJECT: Post from the past
    NAME: Alan R. Mercurio

    Hi, this was asked before and answered by I believe Dave Wood. I hope he
    does not mind my sharing his knowledge?

    CV Is:

    defined as the gpm of water that can pass through a valve with a one psi
    drop in pressure.Cv = Q/square root of the dp is the formula you can use,
    where Q is the number of gallons per minute and dp is the pressure drop,
    orQ = Cv x (SqRt of dp).With a valve with a Cv of 6.3, you get 6.3 gpm
    with a one pound differential or 2.31 feet of head.If your pressure drop is
    increased 2 psi or 4.62 feet, the gpm through the valve is about 8.9
    gpm.Hope it helps. DWood

    http://www.oiltechtalk.com

    The attached CV table is from Robert Bean. Thanks, Robert.

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Tim Doran_2
    Tim Doran_2 Member Posts: 131
    Cv Calculator

    Here is a quick calculator.

    Tim D.
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