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Drayton TRV4 puzzle

Discussion in 'Plumbing and Central Heating' started by u33446z, 9 Nov 2019.

  1. u33446z

    u33446z

    Joined:
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    Location:
    Derbyshire
    Country:
    United Kingdom
    I’ve recently removed a radiator and replaced it with a new one. To remove the old one I removed the TRV4 head and replaced it with a blue plastic screw-on cap to fully close the valve. Having just installed the new radiator I came to refit the TRV4 head and found the mating screw thread the wrong size. What? How could that be? So I removed the TRV4 head from another radiator and observed that the two valves look different, though they both had TRV4 heads. The first image is the one with the new radiator. The TRV4 head thread is bigger than that of the valve - what am I missing?
    IMG_1800.jpg IMG_1799.jpg
     
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  3. u33446z

    u33446z

    Joined:
    12 Jan 2013
    Messages:
    30
    Thanks Received:
    2
    Location:
    Derbyshire
    Country:
    United Kingdom
    Update: the upper valve fits TRV3 head (of which I have several, not in use). My system has a mix of TRV3 and 4 valves - must have forgotten this one was a 3 and not a 4 (I blame my age).
     
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