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Quad ring seals

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duncan webster	06/02/2021 19:21:25
5307 forum posts 83 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. quad No I didn't pay Trelleborg prices!
old mart	06/02/2021 20:42:06
4655 forum posts 304 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.
JasonB	07/02/2021 07:16:05
25215 forum posts 3105 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 webster	07/02/2021 12:20:15
5307 forum posts 83 photos	Thanks Jason, I'll try that
noel shelley	07/02/2021 13:01:30
2308 forum posts 33 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 2	28/02/2021 23:33:34
3293 forum posts 112 photos	O-rings are also made in grades to suit whether static, rotating or reciprocating seals; presumably not interchangeably.

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