After having a go at balancing my heating system, to try and sort a cold radiator (cold at the bottom), I did improve things but alas as sort of expected some of the valves are weeping on a couple of radiators elswere in the house.....they appear to be weeping from the adjustment part rather than the connection to the pipe itself.....The valves themselves are these nasty old ones that need a system drain down every time we need to take a radiator of a wall for decorating.....My question to you experts is, Is there any adjustment on these things to tighten them up a little, to stop them weeping (without draining the system).....the pic is of a bone dry one im afraid. on the leaking ones if i remove the knob the water is seeping from where the tap seats into the casing of the valve...
. To be fair these radiators must be, what well over 30 years old, and at this moment (touching evrything wooden) they do get warm all over, its the newest 8 month old one thats cold at the bottom. but we do plan for a re-pipe with fresh radiators at some time in the near future.....Just to satisfy my curiosity do you chaps have any idea what the thinking was behind these twin entry valves compared to a single valve at each end which is much more sensible in my humble opinion 
