I had the valves and LSVs changed on 5 rads to brand new Honeywell VTL120 Thermostat valve plus LSV kit.
Two of the new LSVs leaked - not around the spindle (and it seems to be the cheap type without a spindle nut), but where the big brass nut (with hole in centre for the spindle) screws into the chrome "L". (The rad pipe to chrome "L" is definately OK.)
The guy (a friend) who did this for me nipped the 2 offenders up and they are now damned tight, but this has only fixed one of them.
I spoke to the suppliers who will gladly replace them, but the value is trivial compared with the effort.
Also any thoughts on changing this LSV without draining down which is difficult as it is a downstairs rad and tough to get much lower.
Thanks.
Jim