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Closing both lockshield valves gravity system

Discussion in 'Plumbing and Central Heating' started by keen2learn, 10 Oct 2016.

  1. keen2learn

    keen2learn

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    Hi,
    Im about to decorate my bathroom and need to switch off the radiator, I hope without shutting down the whole system, my understanding is with my central heating system the bathroom does not have a thermostatic valve so it does not get turned off so the heat has somewhere to expand if all other radiators are turned off, as it is now cool enough to start using the heating system would I be right in thinking as other radiators will be open and in use I can safely isolate this radiator without risking any damage to the system, sorry if thid is a ridiculous question, but thought it better safe than sorry to check

    thanks in advance

    if it helps I have an ideal mexico floor standing boiler, hot water cylinder, f&e in loft and 6 rads all but the bathroom have thermostatic valves very old timer that is set to constant and operated purely through hallway thermostat.
     
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  3. Burnerman

    Burnerman

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    Just turn off both valves and that will allow you to release and drain the radiator if that is what you want to do.....best bear in mind that TRV's don't always fully shut off even on the minimum setting, so post a pic of them if you are unsure.
    John :)
     
  4. keen2learn

    keen2learn

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    Hi Burnerman,
    it more a case of I want to isolate the bathroom radiator from the rest of the system, the bathroom radiator has 2 lockshields rather than a lockshield and trv, I want to keep the rest of the system running, as I have a gravity system and the bathroom radiator is intentionally left without a trv
     
  5. Burnerman

    Burnerman

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    No worries - close both of the valves down.
    Actually the valves are both the same, but its the flow one that's usually adjustable, and the return is referred to as the lockshield which is used for balancing and then capped so it can't be fiddled with.
    John :)
     
  6. gigz

    gigz

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    If you just take a trv head off one of the other rads until your done it'll use that rad as a bypass.
     
  7. keen2learn

    keen2learn

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    Hi Thanks once again Burnerman, if I dont want to remove the radiator, just dont want in to get hot can I just just close the right hand valve to stop the flow of hot water, I assume like a trv .
     
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  9. keen2learn

    keen2learn

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    if the trv's on all other radiators are open, would I need to do that, or is that just belt and braces.
     
  10. Burnerman

    Burnerman

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    Yep, just close that rad down, and take gigz' advice......I'd guess some of the other rads would be open anyway.
    John :)
     
  11. keen2learn

    keen2learn

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    Will I need to fit a decorators cap to the rad with trv removed, and @Burnerman by shut down I assume you mean close the right hand valve fully and leave the left alone
     
  12. Burnerman

    Burnerman

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    If you just want to stop the rad from heating you can close just one of the valves. Fit a decorators cap to the TRV if you need to remove the rad from the wall.
    John :)
     
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  13. keen2learn

    keen2learn

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    Thanks John and gigz, I will remove trv head in spare room to act as a bypass and shut the right hand valve just so the bathroom rad does not get warm
     
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