On Fri, 22 Mar 2019 at 19:31, Gene Heskett <ghesk...@shentel.net> wrote:

> On Friday 22 March 2019 12:24:55 andy pugh wrote:
> > On Fri, 22 Mar 2019 at 16:15, Gene Heskett <ghesk...@shentel.net>
> wrote:
> > > Lack of the ability to bore very fine threads below
> > > nominally 10mm discourages me from attempting a needle valve design

Why not just mist using an atomising nozzle, much like they do outside
restaurants on muggy days;
(see the first drop-down, 'mist cooling' to see nozzles and price of.)

While these use high pressure pumps, I'm sure you could just pressurise
your system by using the water mains pressure.
Sometimes there's a hole in the hosepipe and you get a beautiful fine mist
coming off, so 4bar is plenty pressure to get a mist.

Using air simply adds a bulk volume that has to go somewhere, and
compressed air is expensive.

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