[PSUBS-MAILIST] O-ring Question

[Cliff Redus via Personal_Submersibles]

Alan, the easiest way to get the perfect O-ring grove is to go to
http://divapps.parker.com/divapps/seal/mobile/MaterialSelection/MobileinPHorm.aspx
which is Parker's in PHorm software running as an online app.  This site
completely specs the gland and gland seat under just about  any loading
condition you can think of and prints out a nice report including a diagram
of the grove with all the correct dimensions.  It is lot easier than trying
to digest the 170 page Parker O-ring book.  On stretch for this
application, I concur with Dan's comments.

Cliff

On Sun, Feb 5, 2017 at 7:32 PM, Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi,
> am having trouble Googling an answer to this question.
>    I have an O-ring groove in the bore of my light housing, sealing
> between the bore & the side of my acrylic lens as per attached diagram.
> On a piston O-ring groove it calls for an optimal 2% stretch & not more
> than 5%.
> I can't find any reference to what stretch if any should be, if any, for
> an o-ring
> in a bore groove. I did see that in a rotary application they don't advice
> that
> their should be any pressure on the rotating rod.
> Should I be designing so that the o-ring will have a 2% stretch around the
> lens?
> Thanks, Alan
>
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