On 7/8/05, John Pearson <xero@cmc.net> wrote:
> I am trying to control air flow with a butterfly valve operated by a hobby
> servo motor. The valve is 3" ID. The servo does not have quite enough umph
> to get the butterfly past 1/2 open.
> 
> If I were to switch to a 4" butterfly valve, would it be easier to open if
> the volume of air were the same as with the 3" valve? My guess would be that
> it would require the same force to operate the 4" valve. I hope I am wrong.


   How looks a butterfly valve ?

 thx,
Vasile

> 
> Thanks
> 
> John
> 
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