At least once a year I have both valves leaking (from 2005). If the machine is not down it runs continues. The leaks always occur at the seam of the membrane. As other much used valves (in the dual inlet for instance) never leak it must be due to some phosphoric acid reaching the valves. They are of course the first valves gasses pass through from the reaction vials into the pump line. Only once I had to replace the golden o-ring because I did not get it closed leaktight. I sandpaper the stamp to get rid of the imprint and reuse it.
Arnold van Dijk| Faculteit Geowetenschappen |Universiteit Utrecht | Budapestlaan 4, 3584 CD Utrecht |O. 118 | T. (030) 253 5004| [log in to unmask] |
> -----Original Message-----
> From: Stable Isotope Geochemistry
> [mailto:[log in to unmask]] On Behalf Of Adam Porowski
> Sent: maandag 4 maart 2013 15:38
> To: [log in to unmask]
> Subject: [ISOGEOCHEM] pneumatic valves in KIEL IV
> Dear Colleagues,
> I wander how often are you having to repair the pneumatic
> valves no. 13 and 23 on KIEL Carbonates Device, that is, how
> many samples can be done between changing the gold stamp and
> gold gaskets of the valves???
> Recently we have to change these stuff and I wonder how it
> looks in other labs.
> I look forward to hear from you.
> Thank you in advance.
> Adam Porowski
> ING PAN, Warsaw, Poland
> [log in to unmask]