Blake Mantel wrote:

Hiyah Paul,

I was looking over the chart you sent plus one that my hydraulics professor gave out.
(I'll scan it as soon as finals are over)

One comment on teflon is that it does have a lower abrasion resistance than the standard
rubbers. Also my prof made a comment that teflon loves to have particles embed in it and
cause increased wear on the mating surfaces.

To which Paul Lamar responded:

These things don't move. They just sit there and seal.
If it was an O-ring in a hydraulic piston I can see where that might be a problem.

Don't the oil o-rings move with the rotor?  In which case aren't they moving with respect
to the housing?

Russell Kent

Yes of course Russell.
Perhaps you don't understand how they work. They are inside a C shaped cast iron
oil scraper ring that moves relative to the end housing along with the rotor.
The oil scraper ring plunges in and out only slightly relative to the rotor but only
when the clearance changes between the side of the rotor and the end
housing. The O-ring itself does not slide around on the end housing. 

Paul Lamar
 
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