Try to find the maker of TRV's that have an unusual fitting.
Instead of the head screwing into the body like the normal ones, these have a black plastic ribbed 'collar' which fits over the body & is secured by a small hex grub screw that locates into a grove.
Anyone have a clue about make?
Danfoss made some strange fittings:
Alan.
Thanks Alan, that looks just like it.
Danfoss.Got them in my house.Small allen screw is imperial and needs a good fitting key to release.I usually spray with plus gas before I attempt it.These TRV`s are bad for the plunger sticking in if they are closed for any length of time.
Exactly the problem - so changing the head won't help then?
Take the cap off and you can pull the plunger back with a pair of pliers.Give it a spray and a few push pulls and it`ll be ok for a while.
The plunger - more like a pin - came out when I took the head off, so its moving easily.
Bellows must be a gonner then.
I'm hoping that will be the case. Plan is to replace the head first. It's an office environment & draining down would be a PITA.
You place the side of a spanner or something on the plunger pin. You then tap it gently wirra 'ammer
With luck, it should then spring back up
In message , mark writes
You can remove the plunger with pliers (gently, so as not to score the brass) but it won't necessarily release the action. It needs tapping downwards, but with something on top of the plunger so that you don't distort the pin
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