Perhaps you can give a try to this one:
http://www.banggood.com/Train-Truck-Air-Horn-Switch-Solenoid-Heavy-Duty-Ele=
ctric-Valve-12V-p-922293.html

I have no idea how works, but looks quite good at those money....

Vasile

On Tue, Nov 3, 2015 at 11:26 PM, David VanHorn <microbrix@gmail.com> wrote:

> Yes. Pump is in spec there
> On Nov 3, 2015 4:25 PM, "Kardasinski, Milosz" <
> Milosz.Kardasinski@analog.com>
> wrote:
>
> > These are the least expensive valves that I can think of @ $40/ea.
> >
> > http://www.swagelok.com/downloads/WebCatalogs/EN/MS-01-59.pdf
> >
> > 20 mT base is close to the end of rough vac are you certain that the pu=
mp
> > is capable?
> >
> > -----Original Message-----
> > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behal=
f
> > Of David VanHorn
> > Sent: Sunday, November 01, 2015 1:07 PM
> >
> > I have a vacuum project in the works, and I've just isolated one source
> of
> > leaks.
> > The system needs three shutoff valves.  I used ball valves, and I'm
> > finding that they are leaking. Probably designed for positive pressure
> I'm
> > guessing.
> >
> > Is there someone on the list with vac experience down around 20 microns
> who
> > could suggest relatively inexpensive valves that I could use?   The
> system
> > is now built with 1/8 NPT but I could switch if I need to.
> >
> > These valves just need to be on or off, and they are used for controlli=
ng
> > the flow of air and other gases. No liquids, nothing harsh.
> >
> > Thanks.
> >
> > --
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> >
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