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Tightening single ended compression fittings

Discussion in 'Plumbing and Central Heating' started by quaritch, 26 Jan 2020.

  1. quaritch

    quaritch

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    Hi, wondering how other people do this:

    have just replacing the filling loop for my central heating as the old one was weeping from the check valve. The bit I had real trouble with was getting the isolation valve for the heating side tightened up enough. Normally with compression fittings I use two spanner’s and tighten both sides up simultaneously so the forces work against each other and hold the fitting steady. In this case as I was only tightening the one end, I found it really hard to tighten up, the whole fitting kept spinning on the pipe. Got there eventually though by holding onto it with a stilson. In hindsight I should have got a better quality fitting that has a squared off section to help with this kind of thing.

    Does anyone have any tips to make this easier next time, other than just buy a better quality fitting?

    thanks
     
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  3. CBW

    CBW

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    I believe you may have answered your own question. However if in doubt, use grips, stillson etc.
     
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  4. Madrab

    Madrab

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    Most valve will have flats on the body of the valve to allow a tool to grip it. If not then I use vice (mole) grips. Unscrew the plastic handle off first, makes it easier to grip.
     
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  5. Jackrae

    Jackrae

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    Or the end of the device may have a hex socket machined into it
     
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  7. quaritch

    quaritch

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    Thanks both, thought I’d check for next time, mole grips it is.

    Tangential question, when removing the old valve, it was so tight against a soldered fitting that I couldn’t move the nut back enough to get to the olive - needed to get it off to clean up the pipe prior to fitting new valve. Ended up having to chop out the pipe work around it and remake it. Have I got about this the hard way, is there any ways of getting olives off other than sawing through them with a hacksaw?
     
  8. oldbuffer

    oldbuffer

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    You could use an olive remover like the Monument one (screwfix 88681). Bit expensive for occasional use, and depends on you being able to screw the compression nut onto it.
     
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  9. quaritch

    quaritch

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    yes, that looks exactly the thing that would have been useful!

    Always assumed they grabbed the olive somehow, didn’t realise it threaded into the actual nut
     
  10. Nige F

    Nige F

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    Wont work with really old prestex fittings ;)
     
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