Fitting decorating cap to TRV

[mdlyons]

I am carrying out a renovation of my living room and it is essential that I remove the rads to get behind them. Rather than draining the whole system I want to just drain and remove the radiator.

I have read the guides and understand that I must seal off the lock valve open the bleed valves and undo the bolts etc to drain the rad. I have decorators caps for the honeywell TRV that I understand I have to fit.

How do I physically remove the TRV and fit the cap? I can't figure out how this is done.

 

[seco services]

below the plastic top part of the valve is a knurled nut undo that and the thermostatic top will come off.
then screw your cap on. which will push the brass pin down and shut off valve.

 

[mdlyons]

cheers,
i have unscrewed the trv and when I started to scew the dec cap on a small amount of water started to come out, is this normal? and how tight do I want to screw the plastic cap on?

 

[nickso]

why bother with the cap when the trv head will shut off the valve? unless you need to put the cap on for access behind the trv head i wouldnt bother.

 

[mdlyons]

Because they have been known to open and release the water if not capped off.

 

[nickso]

hmm, i wouldnt buy honeywell ones then cos other ones dont.