Trying to remove the head of a TRV
Anyone tell me what make it is? Or ideas on how to get the bugger off?
The Medway Handyman was thinking very hard :
I think you will find that the roll pin is an Allen grub screw.
I did think that, but close inspection with a magnifying glass doesn't reveal a hexagon. Seems circular, which lead me to believe its a pin of some sort.
Is it an older Danfoss TRV?
on 22/11/2009, The Medway Handyman supposed :
I am CERTAIN that all of that particular make / model I have come across had an Allen grub screw. A roll pin just would not work to hold it in place. Try offering a small Allen key into the head.
The Medway Handyman wibbled on Sunday 22 November 2009 20:33
Being lateral, do any of the black bits want to rotate by hand? My last ones had a knurled black ring at the base that if rotated, locked and allowe dthe head to be lifted off. Didn't look exactly like yours though, so probably not helpful...
Thanks Harry - I shall try an allen key. Maybe previous attempts at removal have damaged the hexagon.
The split in a roll pin would visible on the end.
Clearly a job for the Angle Grinder :-)
BSF the old Danfoss-es used to have a cussed arrangement where you rotated a plastic collet-type-thingy against spring-loading whilst pulling away at the same time. Must say I don't recognise those Bar Stewards in your photos, Dave, but Sod's Law, I'll come up against them myself in the next week or so :-(
Even through the fuzziness of that pic the "pin" does appear to have a recess so probably is a grub screw .
I still have some of these at home, I think they were made by Thorn or at least some company beginning with 'T'.
Anyway they are definitely held on by grub screws, the older ones actually had a plastic collar/clamp around them held with an ordinary screw.
I was talking B@ll@x, they are indeed old Danfoss TRVs.
Thanks chaps. It will have an allen key inserted. "They don't like it up em".
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