i tried to take a radiator off to do plastering and decorationg but the valve will not stop leaking when the heating is on in the rest of the house. it is not a trv. i have put it back on to collect the water but is there a temporary way of stopping the water for about a week while i get the work done.
thankyou

fit a new rad valve or fit a cap on the end of the rad valve.
what size is the outlet to the rad side 3/4" or 1/2" ? then get a cap end to fit and rubber seal.

cheers, i would have to drain down to fit a new valve wouldnt i. are these caps brass or plastic, do they screw on like a rad would?

this is a 3/4" cap.
http://www.partridges.uk.com/catalog/images/Cap_0252_0253.jpg

you also need a 3/4" rubber that sits in the bottom of the cap.

depending on if your rad valve is 3/4" or 1/2".

as for rad valve i would bung the system so no need to drain water from system it just causes a vacuum in the system and the valve can be changed in a matter of mins.

but if your not sure on heating systems etc best to drain the system if you like your carpets etc.