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 controlling
the flow of air and other gases. No liquids, nothing harsh.

Thanks.
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