Open Tolerance Bore - How to Seal
Open Tolerance Bore - How to Seal
(OP)
Hello,
I have an aluminium extruded tube that is 150mm ID. The diameter tolerance is +0.7mm / - 1.3mm. This is a stock component used in our standard product and cannot be modified. For some prototype testing, we want to seal a new filter cartridge into this tube, sealed on the internal diameter. I'm struggling to find a suitable sealing method due to the large tolerance band and wondered if any of you guys had came across any similar issues. The seal mechanism will be static and operating temperatures will be 20C - 100C. The operating pressure will be 1 Bar.G maximum. Compressed air is the medium.
Was thinking of using a large section o-ring with a low shore hardness with back up rings to prevent too much extrusion into the gap. Is this a viable option?
Thanks in advance.
I have an aluminium extruded tube that is 150mm ID. The diameter tolerance is +0.7mm / - 1.3mm. This is a stock component used in our standard product and cannot be modified. For some prototype testing, we want to seal a new filter cartridge into this tube, sealed on the internal diameter. I'm struggling to find a suitable sealing method due to the large tolerance band and wondered if any of you guys had came across any similar issues. The seal mechanism will be static and operating temperatures will be 20C - 100C. The operating pressure will be 1 Bar.G maximum. Compressed air is the medium.
Was thinking of using a large section o-ring with a low shore hardness with back up rings to prevent too much extrusion into the gap. Is this a viable option?
Thanks in advance.





RE: Open Tolerance Bore - How to Seal
Hope it is clear without a drawing.
RE: Open Tolerance Bore - How to Seal
Yes, I do understand your solution - you described it very well. I had actually sketched up something very similar to your description, but rather than using a "square" gland profile, I made the lower plate with a large 45 degree chamfer around the upper outside edge. The o-ring sits in this chamfer and is compressed outwards when the top plate is tightened to the lower plate....something akin to this crush seal arrangement:
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I will sketch up your solution and see how we look.
Thanks.
RE: Open Tolerance Bore - How to Seal