I am unable to remove a radiator because the horizontally fixed valve (circa 1991) will not fully close.
It is not one of the Danfoss valves which were supplied with a plastic cap which could be screwed down to close off the valve.
If I have to replace it will standard valves fit without any major pipework alteration?

Martin., September 2009

trv's are pretty much universal, but easiest to change with another of the same brand.

Ian, September 2009