rad and coolant,

[Ken Mayer]

On Thu, 23 Oct 1997 sdelanty at sonic.net wrote:

> >- -> Well you could do that, but I was kinda thinking of a ball valve and
> >- -> a stepper motor, there's gotta be some out there already. It's also a
> >- -> lot easier from the packaging/plumbing standpoint, and I would think
> >- -> would afford infinite control within system capabilities.
> >
> > I'd love to find something like that.  All of the commercial valves
> >I've seen take more torque than a reasonably-sized stepper can give, so
> >it didn't look practical to cobble something up from pieces.
> 
>   Do You really need something as tight sealing as a ball valve?
>   I would think a butterfly valve would be fine and take less torque
>   to operate... 

Ball valves are not designed for throttling use.  They are either full
open or full closed.  A butterfly would work better.

Ken
:-)