Quad ring seals

Quad ring seals

This topic has 6 replies, 5 voices, and was last updated 28 February 2021 at 23:33 by Nigel Graham 2.

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6 February 2021 at 19:21 #525322
duncan webster 1
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@duncanwebster1
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.

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6 February 2021 at 19:21 #2005
duncan webster 1
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@duncanwebster1
6 February 2021 at 20:42 #525335
old mart
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@oldmart
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.
7 February 2021 at 07:16 #525382
JasonB
Moderator
@jasonb
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.
7 February 2021 at 12:20 #525446
duncan webster 1
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@duncanwebster1
Thanks Jason, I'll try that
7 February 2021 at 13:01 #525457
noel shelley
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@noelshelley55608
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.
28 February 2021 at 23:33 #530866
Nigel Graham 2
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@nigelgraham2
O-rings are also made in grades to suit whether static, rotating or reciprocating seals; presumably not interchangeably.
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