Thanks.I know,its comes up on your profile.
I remove some posts as the staff here use them for their own advertising,replies will change but some seem a reply is the benchmark but beware.
OP: Check to see f the other valves are the same. If you find one, you can use that head to close the valve. However, if the air temp falls below a set value, the valve will open, and squirt water. So,when the rad is removed, use a 1/2"M cap to screw on to the outlet as a precaution. Alternatively, take the known compatible head to a merchant, and buy another.
Merchants tend to be quite good a helping DIYers with daft problems, driving the Pro's mad. It is infuriating being held up for 20 minutes waiting while a discussion over the merits of a rubber washer are discussed,followed by "I'll think about it". But, seriously, avoid the 7 - 8 am rush period.
Good advice to use another from around the house, but sounds like you need a new TRV anyway.
Modern ones tend to have a '0' setting which closes the valve.
I've currently had a rad off the wall whilst decorating for the last month just closing the LV and TRV. No need to tie up the F/E ball or anything.
I think you will find most, if not all, open at some low temperature. Be careful about giving advise unless you are sure.
And the advice to find a matching TRV was for the purpose if identifying a new one.
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