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Model Forum / General / Models / April 2010O ring advice
My coffee machine sprung a leak and on investigation I found the o ring on top of the boiler (Krups thermoblock) had perished and I need to replace it. There is a channel on top of the boiler with ID of 39mm and OD of 44mm. the channel is 1.7mm deep. The boiler top plate is flat. I am no expert but think the ideal replacement should be ID 39.5mm with a CSA of about 2mm. I found a selection of o rings at Altecweb.com but none seem to me to be an ideal fit. e.g. ID 39.45 OD 44.4 CSA 1.78 ID 39.6 OD 44.4 CSA 2.4 Anybody know where I can get a silicon o ring the correct size. Would the 39.6 ID o ring above be OK? Archie > My coffee machine sprung a leak and on investigation I found the o ring on > top of the boiler (Krups thermoblock) had perished and I need to replace [quoted text clipped - 14 lines] > > Archie CSA should of course be CS - cross section. > > Anybody know where I can get a silicon o ring the correct size. Would the > > 39.6 ID o ring above be OK? I would go to Brammer aka BSL or try Eriks. You can download a catalogue from here to find the nearest standard size. O rings are measured and specced by ID and section. http://www.tss.trelleborg.com/uk/www/en/products/product_range/o-rings/Product-D etail_1_1244.jsp Mark. Simply Bearings have a good range of O Rings http://simplybearings.co.uk/shop/o_rings.php For instance they do 39.5 i/d 2mm cross section. I have used them a couple of times and they have been prompt. Roger Woollett > Simply Bearings have a good range of O Rings > [quoted text clipped - 5 lines] > > Roger Woollett Ideal size but they only seem to stock Nitrile o-rings. The existing o-ring is silicon so I think the replacement needs to be the same. Archie >> Simply Bearings have a good range of O Rings >> [quoted text clipped - 10 lines] > > Archie Why not get the correct part from a Krups dealer? >>> Simply Bearings have a good range of O Rings >>> [quoted text clipped - 11 lines] >> Archie > Why not get the correct part from a Krups dealer? Good point. I had discounted that route thinking they would not want to o-ring on its own because it wasn't a user serviceable part and want to supply the complete thermoblock. Also, I have ordered user serviceable parts for the machine before and they took 4 weeks to arrive and sourcing an o-ring quickly seemed a good option. It is worth a phone call to find out though. >> Simply Bearings have a good range of O Rings >> [quoted text clipped - 8 lines] > Ideal size but they only seem to stock Nitrile o-rings. The existing > o-ring is silicon so I think the replacement needs to be the same. Nitrile rubber is one of the finest most resilient/resistant rubbers known to man. For instance it's about the only material that'll withstand phosphate ester hydraulic fluids. (nasty stuff) So if it's good enough for hydraulic seals in aircraft systems then it'll suffice for a little coffee maker! Julian. >>> Simply Bearings have a good range of O Rings >>> [quoted text clipped - 16 lines] > > Julian. It is the temperature rating that causes concern. Nitrile o-rings are rated at up to 120C where silicone o-rings go up to 200C. I know the water coming out of the thermoblock will be less that 100C but as the thermoblock case has the element wound round the outside and I am sure it will reach a higher temperature, especially when producing steam. >>>> Simply Bearings have a good range of O Rings >>>> [quoted text clipped - 21 lines] > thermoblock case has the element wound round the outside and I am sure it > will reach a higher temperature, especially when producing steam. I may have told you a load of rubbish regarding nitrile rings, I found this on the www: http://www.marcorubber.com/materialguide.htm which seems to list various material properties. I still think you're looking for problems that don't exists, just throw a seal in and be done with it - you could probably get away with an off-cut of cat gut if push came to shove! Julian. >>> Simply Bearings have a good range of O Rings >>> [quoted text clipped - 14 lines] > hydraulic seals in aircraft systems then it'll suffice for a little coffee > maker! The use of silicone rubber may be more to do with its suitability for food use rather than its temperature resistance i.e. there are no poisonous additives in the silicone rubber compound that might leach out. I am not stating this for a fact, but as a chemist I do know that some additives such as phthalates are banned from plastics that are intended for contact with food. Cliff Coggin. Cliff Coggin. <> > I would go to Brammer aka BSL or try Eriks. > You can download a catalogue from here to find the nearest standard > size. > O rings are measured and specced by ID and section. > http://www.tss.trelleborg.com/uk/www/en/products/product_range/o-rings/Product-D etail_1_1244.jsp > Mark. Thanks for the Brammer suggestion Mark. I found that there is a Brammer office near me in Grangemouth and they can get me the correct seal in a few days. Minimum order Qty of 20 though so if anyone needs any 39x2 silicone o-rings then I will have some spare. > My coffee machine sprung a leak and on investigation I found the o ring on > top of the boiler (Krups thermoblock) had perished and I need to replace [quoted text clipped - 6 lines] > an ideal fit. > e.g. Ideal fit is of little consequence, it's a coffee machine, not a hydraulic ram gland with 3000psi behind it. Any O ring will do the job provided there's a bit of ''nip'' as you tighten it up or assemble it..... Julian. Were the O-rings Black or Orange Silicone? -- OL |
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