So I need to replace the static o-ring seal. Some background reading: Parker o-ring handbook. Look a section 5. Useful application info - but of course it's Mercan ie imperial units.
Barnwell o-ring catalogue including piston groove dimensions.
George Lodge Direct website.
The static o-ring seems to have become shredded, presumably during insertion last time round. This would have leaked like a sieve if I'd tried it.
The dynamic seal on the piston looks fine.
Thin o-ring:
- Bead - 3mm diameter
- Piston - 110mm diameter
- Groove - 105.5mm diameter (this is the required ID dimension)
Fat o-ring:
- Bead - 5.5mm diameter
- Piston - 110mm diameter
- Groove - 100mm diameter (this is the required ID dimension)
So I require an o-ring with an ID of 105.5mm and a bead diameter of 3mm.
Like this from George Lodge Direct Consider it ordered...
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