<div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif">Mac,</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif">If the problem you're having is a damaged toroid face, I've used both of these as a fix, with success.</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(249,249,249)">Parker-Veriflo Vacuseal Grooved Gasket (1/2" nominal), with retainer, stainless steel  </span><span style="background-color:rgb(249,249,249);color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px">8 GVGR-SS</span><br></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(249,249,249)"><br></span></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(249,249,249)">Parker-Veriflo Vacuseal Grooved Gasket (1/4" nominal), with retainer, stainless steel  4 </span><span style="background-color:rgb(249,249,249);color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px">GVGR-SS</span><span style="color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;background-color:rgb(249,249,249)"><br></span></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="background-color:rgb(249,249,249);color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px"><br></span></div><div class="gmail_default" style="font-family:arial,sans-serif"><span style="background-color:rgb(249,249,249);color:rgb(51,51,51);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px">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.</span></div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div>Dennis<span class="gmail_default" style="font-family:arial,sans-serif"> Schweiger</span></div><div><span class="gmail_default" style="font-family:arial,sans-serif">University of Michigan/LNF</span></div><div><span class="gmail_default" style="font-family:arial,sans-serif">Facilities Manager</span></div><div> </div><div>734.647.2055 Ofc</div><div> </div><div>"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?</div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Aug 11, 2021 at 1:05 PM Mac Hathaway <<a href="mailto:hathaway@cns.fas.harvard.edu">hathaway@cns.fas.harvard.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">

  
  <div>
    Hello All,<br>
    <br>
    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.<br>
    <br>
    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.<br>
    <br>
    Any trick to keeping the polished particles out of the bore, or just
    an ultrasonic clean at the end?<br>
    <br>
    If it's impossible, that's good to know, as well.<br>
    <br>
    Thanks,<br>
    <br>
    <br>
    Mac<br>
    <br>
    <br>
    <div>
      
      
      
      
      
      
      
      
      
      
      <div>
        <p class="MsoNormal" style="margin-bottom:0.0001pt"><span>Mac
            Hathaway<u></u><u></u></span></p>
        <p class="MsoNormal" style="margin-bottom:0.0001pt"><span>Senior
            Process and Systems Engineer<u></u><u></u></span></p>
        <p class="MsoNormal" style="margin-bottom:0.0001pt"><span>Harvard
            Center for <span>Nanoscale</span> Systems<u></u><u></u></span></p>
        <p class="MsoNormal" style="margin-bottom:0.0001pt"><span>11
            Oxford St.<u></u><u></u></span></p>
        <p class="MsoNormal" style="margin-bottom:0.0001pt"><span>Cambridge,
            MA<span>  </span>02138<u></u><u></u></span></p>
        <p class="MsoNormal" style="margin-bottom:0.0001pt"><span>617-495-9012<u></u><u></u></span></p>
        <p class="MsoNormal" style="margin-bottom:0.0001pt;line-height:normal"><span><u></u> <u></u></span></p>
      </div>
    </div>
            <br>
  </div>

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</blockquote></div>