[labnetwork] Cleaning up/ reconditioning VCR seals?

[Dennis Schweiger]

Mac,

If the problem you're having is a damaged toroid face, I've used both of
these as a fix, with success.

Parker-Veriflo Vacuseal Grooved Gasket (1/2" nominal), with retainer,
stainless steel  8 GVGR-SS

Parker-Veriflo Vacuseal Grooved Gasket (1/4" nominal), with retainer,
stainless steel  4 GVGR-SS

I would expect your Parker rep to be able to provide them for you. They're
not cheap.  When last I purchased them, they were $8, and $7, each, however
it was way cheaper than reworking the gland connection.

Dennis Schweiger
University of Michigan/LNF
Facilities Manager

734.647.2055 Ofc

"People can be divided into 3 groups - those that make things happen, those
that watch things happen, and those that wonder what happened."  Within
which group do you belong?


On Wed, Aug 11, 2021 at 1:05 PM Mac Hathaway <hathaway at cns.fas.harvard.edu>
wrote:

> Hello All,
>
> I'm wondering if anyone has ever developed a scheme for polishing or
> reconditioning VCR sealing surfaces.  Obviously, buying a new one is the
> best approach, but some of our fittings are rather expensive or hard to
> come by, and some technique for cleaning up mild wear or whatnot would be
> handy.  And of course, this would not be applied to toxics.
>
> I leak test these down to 1E-12 torr-liter/sec, so that would be my goal.
> I imagine coaxial spinning of the fitting surface would be best (not
> hand-held), but what final grit would be needed.  Is electropolishing
> absolutely necessary to get a good seal?  This would be very light
> polishing, not enough to flatten the bead of the seal.
>
> Any trick to keeping the polished particles out of the bore, or just an
> ultrasonic clean at the end?
>
> If it's impossible, that's good to know, as well.
>
> Thanks,
>
>
> Mac
>
>
> Mac Hathaway
>
> Senior Process and Systems Engineer
>
> Harvard Center for Nanoscale Systems
>
> 11 Oxford St.
>
> Cambridge, MA  02138
>
> 617-495-9012
>
>
>
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