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Re: metal diffusion pumps
Roger,
Ah, a stainless metal pumper. With a wee bit of engineering you'll be on
your way. Is it air, or water cooled?
First, find ANYTHING that matches the flange on the pump input. In my case
the (ancient) pump came with a bolt-on O-ring sealed heavy steel pipe. I
chopped this pipe down to about 3" tall and fitted a 1/4"-steel cap to it. I
then cut a hole in the side of the pipe and fitted a NW-KF 25mm flange stub
to it (available at most high-vac suppliers like Duniway, HPS, etc.). By
"fitted" I just mean that I cut the parts to size -- I then brought them to
a SKILLED welder (in my case a retired NASA dude with his t.i.g. rig in the
garage) and had him do the welding. Couple hours of my time and $25 for the
welding....
So now I had a "hat" on the top of my metal pump; the sealing O-ring didn't
fit good so I used "torr-seal", works great. For me that was all I needed,
since my whole manifold is made of NW-KF-type fittings.
But you still need to connect to glass. There's a couple ways to do this --
the slickest is to get a soda-glass (or pyrex, if you need it) "flange
blank" from Eurocom Imports. This is a glass tube that has a NW-KF
compatible flange cast in glass at one end. Weld this to your glass system
and clamp it to the pump.
However a regular NW-KF clamp won't work, you'll need a "pertinax" clamp to
clamp it on; Eurocom also sells these. If for some reason Eurocom doen't
stock these any more I can get you the manufacturer's direct address
(they're made in Holland, and I once got in trouble for publishing the
direct-mail info -- violation of distribution rights and all that.)
As for using stainless pipe for your system, I'm a big fan of doing it this
way -- but then, I live in earthquake territory.
-Ted Pirsig
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