Thanks for the info Larry!  I'll check out his web site!
Jim

----- Original Message -----
From: "Larry Green" <larry.green@SYMPATICO.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, December 26, 2003 3:56 PM
Subject: Re: [EE:] Miniature solenoid-style valves


> Subject: [EE:] Miniature solenoid-style valves
>
>
> Anyone have recommendations for a U.S. supplier of small (tiny?) valves
for use
> with chemical solutions?  The flow rate should be somewhere in the
neighborhood
> of 30L/Hr (1/2L per min.) and operate at less than 5 PSI.  Ideally, I'd
like to
> run from 5VDC, but can use other (low) voltages if need be.   Response
times for
> open/close aren't critical, and I wouldn't necessarily say they "must" be
> solenoid types if something else is equally suitable.
> I've been looking all over the web and see a *lot* of possibilities out
there,
> but wonder if any of you folks have actual experience with these things.
> Thanks for any ideas!
> Jim
>
> Hi Jim,
>
> I sent your request to a good friend of mine in the irrigation/fluid
transfer
> business, his replies to your questions are below (preceded by
@@@@).......
>
> --------------------------
>
> > Anyone have recommendations for a U.S. supplier of
> small (tiny?) valves for use
> > with chemical solutions?
>
> @@@@ I make 'em in PVC or Delrin plastics... Delrin is
> impervious to most everything....
>
> > The flow rate should be somewhere in the neighborhood
> > of 30L/Hr (1/2L per min.) and operate at less than 5
> PSI.
>
> @@@@ Volume is not the major problem, but at 5 PSI or
> LESS pressure, delivering 1/4 Gpm is a tough order.  It
> takes a minimum of about 20PSI to seal electrical
> non-diaphragm solenoids.  Diaphragm type valves are
> going to be quite expensive and aren't really
> applicable in the pressures mentioned, let alone the
> size.
>
> > Ideally, I'd like to run from 5VDC, but can use other
> (low) voltages if need be.
>
> @@@@ To locate/purchase 5VAC/DC solenoids is going to
> be exorbitant in cost.  They might be available from
> Beckman, the medical testing machine folks, but I'll
> guarantee they will be well in excess of $100 each as
> they are tied into the medical testing profession.  24
> VAC solenoids are, however,  easily obtained and
> downright cheap to buy, so perhaps small relays with a
> 5 VAC activation voltage might be used to get 24 VAC to
> the solenoid....
>
> > Response times for open/close aren't critical, and I
> wouldn't necessarily say they
> > "must" be solenoid types if something else is equally
> suitable.
>
> @@@@ Hydraulic type valves could be addressed here, but
> they, too, are of the diaphragm type, and probably not
> usable here.
>
> > I've been looking all over the web and see a *lot* of
> possibilities out there,
> > but wonder if any of you folks have actual experience
> with these things.
> > Thanks for any ideas!
>
> @@@@ Well.... I MAKE 'em!!   Sent him to my website and
> have a look at the "Hermie" valve.  The basic body can
> be pared down in size and in/outlets can be most
> anything he might want....  Might be worth his looking
> at the site and see if it's applicable in his case...
>
> -------------------------
>
> So if you are interested Jim my friends website for his valves is.........
>
> http://members.cox.net/tismaz/hermie.htm
>
> and his main site is at...........
>
> http://members.cox.net/tismaz/billtism.htm
>
> Hope the information is useful.
>
> Larry Green VE3YET
>
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