1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Replace TRV with 8mm pipe

Discussion in 'Plumbing and Central Heating' started by JimDogweed, 5 Nov 2020.

  1. JimDogweed

    JimDogweed

    Joined:
    23 Mar 2020
    Messages:
    19
    Thanks Received:
    1
    Country:
    United Kingdom
    I have a faulty TRV. When the pin is fully open, it's fine. But I notice it leaks when the pin is depressed and the TRV is off. I've tried giving it a tap, wiggle, and some WD40.

    I'm looking to replace the TRV and re-use the nut/olive - so I can swap the TRV over without having to cut any pipe etc (especially since there's no "spare" length on the pipe).

    What TRV should I be looking for - some are for both 8mm and 15mm (like this) but I'm not 100% sure if that will allow me to do what I want.

    Any advice?

    Thanks in advance.

    IMG_2175.jpg
     
  2. Sponsored Links
  3. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,218
    Thanks Received:
    3,023
    Location:
    Daventry
    Country:
    United Kingdom
    Looks like a standard 15mm TRV with a reducing set in it, so any 15mm TRV will fit
     
    • Thanks Thanks x 1
  4. JimDogweed

    JimDogweed

    Joined:
    23 Mar 2020
    Messages:
    19
    Thanks Received:
    1
    Country:
    United Kingdom
    Thanks - Is there anything I should consider, or is it a case of adding some jointing compound stuff around the olive. Any need for the tape on the threads here?
     
  5. terryplumb

    terryplumb

    Joined:
    8 May 2017
    Messages:
    5,970
    Thanks Received:
    1,231
    Country:
    United Kingdom
    Doesn't look like a 15 mm inlet on that valve ,looks like it's for microbore ,judging by the size of the compression nut.
     
  6. JimDogweed

    JimDogweed

    Joined:
    23 Mar 2020
    Messages:
    19
    Thanks Received:
    1
    Country:
    United Kingdom
    What TRV could I swap it out for?

    Here are some shots from under - sorry for the angle, it's a bit of an awkward spot.

    IMG_2176.jpg IMG_2177.jpg
     
  7. terryplumb

    terryplumb

    Joined:
    8 May 2017
    Messages:
    5,970
    Thanks Received:
    1,231
    Country:
    United Kingdom
    If you want a fairly straightforward swap ,without having to amend Pipework ,then you need a valve with inlet port for your supply pipe size ,think you said it's 8 mm ?
     
    Last edited: 5 Nov 2020
  8. Sponsored Links
  9. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,218
    Thanks Received:
    3,023
    Location:
    Daventry
    Country:
    United Kingdom
    Hmm Terry may well be right here. And no, you don't need PTFE on the threads
     
  10. dal5band

    dal5band

    Joined:
    3 Mar 2005
    Messages:
    765
    Thanks Received:
    54
    Location:
    Surrey
    Country:
    United Kingdom
    But you will need to get the same make / size TRV. 15mm into rad, 8mm onto pipe
    .
     
  11. JimDogweed

    JimDogweed

    Joined:
    23 Mar 2020
    Messages:
    19
    Thanks Received:
    1
    Country:
    United Kingdom
    Yes, the pipe is 8mm. As mentioned in the original post this one says it is for both but not 100% if it would allow to swap out without amending the pipe.

    Or maybe this is better?
     
  12. terryplumb

    terryplumb

    Joined:
    8 May 2017
    Messages:
    5,970
    Thanks Received:
    1,231
    Country:
    United Kingdom
    Any valve that comes with reducers for 8 mm is no use ,unless you want to frat about cutting off olive from pipe and fitting the reducer set. You need a valve that comes with an 8 mm olive ,and hopefully the same thread on the nut as what you have . The easiest thing would be to replace the existing valve for another that's identical. There should be manufacturers ID / brand info on the actuator head ,is there ?
     
  13. JimDogweed

    JimDogweed

    Joined:
    23 Mar 2020
    Messages:
    19
    Thanks Received:
    1
    Country:
    United Kingdom
    Managed to swap it out for a Pegler 8mm valve and all good so far!
     
    • Like Like x 2
  14. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page