Replace TRV with 8mm pipe

JimDogweed

JimDogweed

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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
 
muggles said:
Looks like a standard 15mm TRV with a reducing set in it, so any 15mm TRV will fit
Click to expand...

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?
 
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.
 
terryplumb said:
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.
Click to expand...

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
 
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:
Hmm Terry may well be right here. And no, you don't need PTFE on the threads
 
But you will need to get the same make / size TRV. 15mm into rad, 8mm onto pipe
.
 
terryplumb said:
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 ?
Click to expand...

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?
 
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 ?
 
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