John P
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| posted on 3/3/13 at 10:19 AM |
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Self-Cutting Isolating Valve – Anyone Used Them?
I need to run a hot water supply to a new wash basin and the only supply anywhere near is the 15mm pipe which takes the hot supply from the
combi-boiler.
The problem is that the pipes are close together here and also appear very rigid so I’m concerned that I would have to cut through the pipe with a
hacksaw blade (no room for a pipe-slice) and once done there may well be insufficient movement in the pipe to enable me to fit a Tee piece.
I have seen these “Self-Cutting Isolating Valves” but do they affect the flow in the existing pipe which supplies the rest of the house.
I assume they cut a small hole in the pipe but as the new connection is only to a wash basin I would assume the flow would be adequate.
Any comments / suggestions?
John
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tegwin
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| posted on 3/3/13 at 10:28 AM |
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I wouldn't go down that route personally. Are you sure there is nowhere on that pipe you can safely cut in and fit a proper T joint?
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britishtrident
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| posted on 3/3/13 at 10:32 AM |
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Commonly used for fitting washing machines and garden taps they work fine but they can sometimes leave a loose shard of metal in the pipe you are
cutting into, this caused me a problem a few years back when the shard flying about inside the pipe caused a pin hole in in the rubber liner of a
braided flexible tap connector.
[Edited on 3/3/13 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Mikef
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| posted on 3/3/13 at 10:39 AM |
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I have used them, and never had an issue. good point about the shard of metal,though.
MikeF
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40inches
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| posted on 3/3/13 at 11:27 AM |
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I have fitted dozens of them, the only problem I have encountered is the metal spigot that pierces the pipe rusting, and blocking the flow. After many
years I might add.
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JoelP
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| posted on 3/3/13 at 11:49 AM |
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Wouldnt dream of using one myself. You can get slip couplings, basically a straight connector that has no ridge in the middle so it can slide fully
onto the pipe. This means you dont need to be able to push the pipes apart, just move them 15mm to one side. Fit your tee and then use the slip
coupling to rejoin it all. Then its all soldered.
Beware! Bourettes is binfectious.
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inkafone
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| posted on 3/3/13 at 02:37 PM |
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Easiest to use 15mm plastic pipe. It's all pushfit,just don't forget to use inserts on the plastic pipe connections. Screwfix sell it
quite cheaply.
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RoadkillUK
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| posted on 3/3/13 at 03:57 PM |
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If you can cut through with a hacksaw, you can fit one of these, it's not cheap but you might find it cheaper elsewhere, it works by having a
'sliding' part which will extend it to reach, therefore no need to move the pipes.
Screwfix LINK
Roadkill - Lee
www.bradford7.co.uk
Latest Picture (14 Sept 2014)
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John P
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| posted on 3/3/13 at 04:57 PM |
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The self-cutting valve is still an attractive option because it wouild be easy to fit but I think I may go with the slip coupling suggestion if I can
get to it OK. (Somehow it just seems like a better engineering solution).
I quite like the idea of the Speedfit Slip Tee but not sure it would be OK with a hacksawed tube end. I always thought you needed to use a tube
cutter so it would slide through the internal O Ring without damage.
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