DIYbanter - View Single Post - Can't shut off radiator manually with TRV

Dysanovic

I am about to remove a radiator which has a TRV valve. FYI the TRV valve I had was a Drayton/Invensys model, and it was not obvious how to go about completely closing it.

I thought I'd need a safety cap as the TRV only apeared to have a frost setting. What I found is that with a little bit of force the TRV could be turned to the '0'/decorators setting (i.e. positive 'off' position), but the instructions did not state this!

If it is permanently hot it I think it could be due to the fact that the radiator is not correctly balanaced. I believe you balance the radiator by altering the lock shield valve (but don't quote me on that!).

Quote:

Originally Posted by Drake

On 9 Oct 2006 09:41:05 -0700, "Fash"
wrote:

In normal operation it would either be crud or corrosion around the
valve seat or that the head has failed.

If your problem is that you want to shut off the valve to be able to
remove the radiator, then valves normally come with an extra plastic
cap that is screwed on in place of the head for this purpose.

Lots of TRVs don't claim the ability to completely shut off flow. Some
have a positive 'off' position but usually make some claim to this as
an added feature in the blurb. Therefore you may be wrong to call it a
'failure'. If this is the case, you better hope you haven't upset it
too much by cursing it and otherwise saying rude things about/to it!

Thanks for the reply (Likewise to Andy). The odd thing is that the TRV
doesn't even seem to be controlling the temperature of the rad at all.
It seems to be permanently on 'very hot'. Seems to defy logic...

Drake