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Hi,

I want to thank all who e-mailed me on this topic.
Basically I was told to get the Parker o-ring catalog and
selection guide.


Doug Chapman wrote:
>The "dual-occupancy" configuration you describe is an o-ring with a backup
>ring. The backup ring which may be a rectangular ring of nylon (usually
>split for ease of installment) is used to eliminate the gap between the two
>mating parts, in your case the gap between the tubular housing and the
>endcap.

>Since the backup ring you describe is located on the wet side of the o-ring,
>it would be expected the higher pressure would have been on the inside the
>cannister.


I checked the relative position of the backup ring and it's on
the "dry" side of the o-ring.  I was wrong the first time.
This then supports the view that the cannister was built
for external pressurization.

>Hope this sheds some light,
With time maybe 100 Watts worth :-).  Thanks.


John
cc015012@br*.br*.ed*

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