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Quad ring seals

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duncan webster06/02/2021 19:21:25
3130 forum posts
52 photos

I've bought some quad ring seals to use on my latest loco instead of o rings for the piston seals. The manufacturers recommend 10-15% squeeze, same as O rings, but I'm aware that people use much less on orings in steam engines. Anyone got relevant experience? Save me experimenting.


No I didn't pay Trelleborg prices!

old mart06/02/2021 20:42:06
2829 forum posts
178 photos

You could try them at standard fits, and if that proves too tight, just deepen the ring groove in the piston. Quad ringsare intended for use with hydraulic oil or brake fluid, so a steam engines lower lubrication and heat might be a problem. I hope there is an o ring of the same size to use if the quad rings prove problematic.

JasonB07/02/2021 07:16:05
20250 forum posts
2207 photos
1 articles

I only have one engine that specified quad rings but could not source them at the right price at the time so did not use them but the drawing suggest 3 to 5% compression. This seems to be similar to the suggested compressions of O rings for ME use which are about half the commercial amount.

duncan webster07/02/2021 12:20:15
3130 forum posts
52 photos

Thanks Jason, I'll try that

noel shelley07/02/2021 13:01:30
483 forum posts
14 photos

O rings are available in numerous materials, nitrile, viton, silicon and also in various grades of " shore" hardness. Shore 70 being normal. Endless hours of fun for the experimenter ! Noel.

Nigel Graham 228/02/2021 23:33:34
1246 forum posts
17 photos

O-rings are also made in grades to suit whether static, rotating or reciprocating seals; presumably not interchangeably.

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