CV RATING

Rob_15

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.

Tim Doran_2

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

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.

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Tim Doran_2

Cv Calculator

Here is a quick calculator.

Tim D.