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josej
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Join Date: Mar 2008
Location: Mumbai
Posts: 233
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Rated Cv

07/13/2012 6:09 AM

Dear ALL,

For On Off Valve Full Port Ball Valve Type , While preparing specsa ,is it customary to specify Rated Cv

Regards

Jose
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: Rated Cv

07/13/2012 6:18 AM

As the valve is on/off, and full bore, there is absolutely no reason to specify Cv.

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josej
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Location: Mumbai
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#2
In reply to #1

Re: Rated Cv

07/14/2012 6:36 AM

Thanks
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Iris
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#3

Re: Rated Cv

07/14/2012 11:51 AM

to the point - GA
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artonpaper
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Join Date: Apr 2007
Location: Los Angeles, CA
Posts: 18
#4

Re: Rated Cv

07/15/2012 1:00 PM

All valves have a Cv and if purchasing/specificing a valve, state the Cv.

Otherwise, how does one know if it will work?

A slurry will have a different flow rate (Cv) than water.

Be a smart engineer and specify the Cv.
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vargaalex
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Join Date: Dec 2010
Location: New Orleans, LA
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#5

Re: Rated Cv

07/16/2012 9:33 AM

All valves have a rated Cv but for on off purposes, you only need to know the general Cv for the line size valve you will be choosing.

But be careful that the valve is sized for the correct maximum flow, in other words make sure the maximum flow of the valve can handle your design throughput.
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Previous in Forum: Estimating Orifice Plate Installed Accuracy for Turn Down Operation   Next in Forum: Calculation for Total Air Flow in Boiler


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