Timeline for O-Ring vs flat washer for air seal
Current License: CC BY-SA 3.0
8 events
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| Jul 10, 2017 at 17:09 | comment | added | phyllis diller | It's possible the O-ring would stick to the head, but I find that for the most part, my face seal O-rings get jammed into the groove pretty well and I have to use a dental pick to remove them. I'm using relatively small ones, but probably around the same size you'll need - AS568 0.07in cross section, #s 7-30 (inner diameters ranging from 5/32in to 1.5in, roughly). It helps if you make the inner diameter of your groove on the small range of the recommended size. This is also typically important when you have a lower internal pressure. | |
| Jul 10, 2017 at 10:22 | comment | added | carveone | I think you are right that O-Rings are more predictable than flat washers for sealing applications, even when the pressure diff isn't high. It was pinching or pulling the o-ring that I wasn't sure about. If I have a ring in a groove like I illustrated, perhaps a lot of force would be necessary to get the tube on. Which is why I prefer what you are saying - seal the face to face interface with an o-ring. But if it's not held in place, surely when the head retracts, the o-ring could fall out or stick to the head!? I'm looking at every air seal I can find thinking "how does that stay in there"!! | |
| Jul 10, 2017 at 10:15 | comment | added | carveone | Oh, I see what I did - I typed "low pressure" application when I meant "low pressure differential". I'm sorry - that's a completely different kettle of fish. | |
| Jul 10, 2017 at 10:13 | comment | added | carveone | I think I tried to present too much information as an entire design and missed some important points (that I didn't know were important at the time) so I've added some edits. The pressure isn't very high and the plate doesn't need to be air sealed - only insulated against the tube when it gets hot. That's what the green washers are for. | |
| Jul 10, 2017 at 3:38 | comment | added | phyllis diller | Thanks Eric. Mostly I put it on the bottom to avoid the possibility of it falling out due to gravity if the tube gets unscrewed (which it sounds like it does). Might be easier to modify the tube part rather than whatever this plate is, though. | |
| Jul 10, 2017 at 2:15 | comment | added | Eric S | Good answer although I would put the groove in the tube head instead of the plate. | |
| Jul 9, 2017 at 22:10 | history | edited | phyllis diller | CC BY-SA 3.0 |
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| Jul 9, 2017 at 21:50 | history | answered | phyllis diller | CC BY-SA 3.0 |