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How to isolate this lockshield and some other questions about leaking rad bleed valve

Discussion in 'Plumbing and Central Heating' started by Mmcgar, 22 Nov 2018.

  1. Mmcgar

    Mmcgar

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    Hi all
    Decided to bleed my bedroom radiator tonight due to a clicking noise coming from it. Unfortunately I now have a very slight leak from the bleed valve, I think I may have over tightened it a little but iv also had issues with this particular valve on the past. It's not a bad leak basically every 10 mins or so if I dab the valve there is wet spotting but it's not a constant flow of water etc.

    I was thinking that to avoid losing pressure in the CH system I could isolate both the lockshield and the trv I assume this would fully isolate the radiator from the system?

    My issue is all my radiator valves got replaced on my recent boiler upgrade and I'm not sure how to isolate these ones My old ones had a small handle I could turn with a shifter but not sure about these any advice on this? Also, any general advice on fixing leaking bleed valve?
    Thanks
    20181122_201510.jpg
     
  2. JohnD

    JohnD

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    they're the ones that come with Danfoss RAS-C2. Very neat. An allen key to fit is supplied in the box with each valve. I don't remember the size, but if you have a modern metric set, one will probably fit. The nut on the top unscrews for access.

    If you ask Danfoss they might send you a key and the instructions.

    http://products.danfoss.co.uk/produ...-valves/ras-c2-thermostatic-radiator-valve/#/

    BTW the clicking is probably dur to lack of plastic horseshoe packers on the brackets. You will have to lift the radiator off to fit them. Get a few dozen.
    https://www.ebay.co.uk/sch/i.html?_...0&_nkw=radiator+plastic++bracket&_sacat=11700


    Take out the old bleed plug and fit new.
    https://www.screwfix.com/p/radiator-spanner/11467

    modern ones fit with an ordinary spanner which is easier.
    https://www.ebay.co.uk/sch/i.html?_...nt+-key.TRS0&_nkw=radiator+vent+-key&_sacat=0


    put ptfe tape round the thread.
     
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  4. Mmcgar

    Mmcgar

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    JohnD
    Thanks for that detailed reply!
    I'll look into those anti vibration brackets, are these things easy enough to fit? My pipework is done in decades old microbore so I'm always a bit wary of disturbing it incase it causes any issues.
     
  5. JohnD

    JohnD

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    you close the valves at each end of the rad, unscrew them and lift the rad off, tilting it to pour the dirty water into your handy bucket without staining the carpet. You will see two steel angle brackets screwed to the wall, with notches to receive the metal straps welded to the back of the rad. You put a plastic horseshoe into each of the upward-facing notches, then lift the rad back onto them, align it and tighten the rad valves back up.

    As you have microbore, any time you are thinking of draining the system, for example if you are going to work on several rads, add a cleaning chemical such as X400 beforehand, and it will loosen some of the sludge and sediment so it comes out when you drain and rinse.

    Add an inhibitor such as X100 on final fill.
     
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