Thanks for all the ideas and tips. Still monitoring the posts but I should
probably get back to work sooner or later so I'll respond sporadically as I
see something jump out at me.
Thanks again folks!!!
Truthfully, I'd say if the machines lasts 2-3 years with out lube they
should simply replace or overhaul the equipment, like most every thing that
the medical industry consumes their tools/equipment goes out for repaired
Why not use teflon rings that are a very close fit to the cylinder
walls? They will wear a bit over time, but if the cylinder is smooth,
they should still seal well enough to develop pressure, and not stick or
I looked at my Parker O-Ring Handbook and they discuss o-ring sliding
friction, etc. They claim to make PTFE coated o-rings as one option,
but maybe you should call one of their technical reps and discuss your
problem with them and see if there is anything new out there. The
handbook says that generally that the harder durometer elastomers have
less sliding friction, but optimal design has many factors including
groove depth, materials, etc.
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