Brian Meek | 28/03/2020 17:49:40 |
3 forum posts | Repairing my central heating system, I have difficulty in mating modern 22mm o/d pipe with old ¾ inch bore system to fit a new pump. |
JasonB | 28/03/2020 20:04:44 |
![]() 25215 forum posts 3105 photos 1 articles | Use pump valves with 22mm compression but change the supplied olives to 3/4" olives which will fit your old pipework.. |
Steviegtr | 28/03/2020 20:24:38 |
![]() 2668 forum posts 352 photos | They sell a sleeve. That fit over the 22mm & slides down ,it has no centre crimp. I had to use one when I fit the new boiler. You can then make up you fittings & then line up & slide the socket over the centre of the joint to solder. Hope that makes sense. Steve. |
Former Member | 28/03/2020 20:30:52 |
1329 forum posts | [This posting has been removed] |
Brian Meek | 29/03/2020 14:47:00 |
3 forum posts | Thank you for your replies. As stated I have tried reducing-sleeves. Room is tight because I cannot move the mating valve. Hence my need to have a reduced diameter over a short length. Hope this makes sense.
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Former Member | 29/03/2020 14:59:26 |
1329 forum posts | [This posting has been removed] |
noel shelley | 29/03/2020 15:12:57 |
2308 forum posts 33 photos | For reducing pipe diameters I use my hydraulic pipe swaging press. With 8 dies it gives a near perfect circle. To increase a copper pipe size machine up a tapered(3/4"of I/D size,taper to new I/Dsize, 1" of new I/D) dolly,lubricate and drive down the pipe. This works best on thicker walled pipe, modern due to copper costs is often to thin even to bend properly without kinking. If your near by I may be able to help. Best wishes Noel. |
Norfolk Boy | 29/03/2020 22:37:03 |
74 forum posts 18 photos | https://www.screwfix.com/p/solder-ring-adapting-couplers-22mm-x-2-pack/74038 There is also a compression coupling |
blowlamp | 30/03/2020 00:00:11 |
![]() 1885 forum posts 111 photos | You might be able to use an ER collet to swage some 22mm pipe. What about turning/drilling some brass bar to the right size to make a suitable fitting?
Martin. |
Bazyle | 30/03/2020 01:16:01 |
![]() 6956 forum posts 229 photos | How about the device used for cutting copper pipe that looks like a gclamp to screw down a cutting wheel onto the pipe. Replace all wheels with rounded wheels that can be progressively squeezed down onto the well annealed pipe while rotating. |
Alan Charleston | 30/03/2020 06:37:00 |
157 forum posts 26 photos |
I made a tool which bells out the ID of 1/2" copper pipe to the OD so two pieces can be brazed together. The small diameter is 1/2" followed by a slow taper till the OD is reached then a parallel length at the OD. The pipe is grasped in the left hand and the 1/2" section is inserted. The tool is then whacked with a big hammer until the desired result is achieved. It probably wouldn't hurt to anneal the copper first, although I haven't had any pipes crack. Obviously the dimensions would be changed to suit your pipes.
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Michael Gilligan | 30/03/2020 07:30:43 |
![]() 23121 forum posts 1360 photos | Posted by Bill Chugg on 28/03/2020 20:30:52:
A SLIP COUPLER is the technical name, so my plumber son has just informed me. Bill . There was some discussion of those on this recent thread: **LINK** https://www.model-engineer.co.uk/forums/postings.asp?th=148817 MichaelG. |
Speedy Builder5 | 30/03/2020 08:07:07 |
2878 forum posts 248 photos | make a brass solder nipple to fit the 3/4" pipe but with "olive" dimensions for the 22mm fitting oops, the cut and paste photo didn't work - look up "Solder pipe nipple". on google
Edited By Speedy Builder5 on 30/03/2020 08:08:54 |
Brian Meek | 31/03/2020 20:05:11 |
3 forum posts | Many thanks to all of you who answered my query. Nothing to photograph as system is dismantled. Seems I must think again.
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Grizzly bear | 31/03/2020 20:25:44 |
337 forum posts 8 photos | Brian, There has been numerous good suggestions, why can't you use any of them? Bear.. |
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