MegaSack DRAW - This year's winner is user - rgwb
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Plumbers!
I have a kitchen mixer tap dripping from the spout. Using the isolators I worked out it was the cold supply and ordered a new valve that I promptly fitted. It was fine for 12 hours then I noticed it was dripping again. For whatever reason turned it a degree or two back to on and the drip stopped. I then swapped the old valve back over and the problem's the same with that implying a problem with the tap body rather than the valve. The tap is probably about three years old but I can't for the life of me figure out how relaxing the valve would stop the drip. Any thoughts?
Possible if it a ceramic disc type that the discs are out of line slightly meaning they rotate too far and open again slightly when fully “closed”
As above. I can't see it being the body as the cartridge rubber seal sits against the inner surface and doesn't move.
Visual inspection (by someone who doesn't know plumbing tolerances) of the old and replacement valve suggest the discs only rotate as far as fully closed and don't go beyond to begin opening again. I don't suppose the relative position of the valve in the tap matters? I'm nipping it up tight with a decent sized adjustable spanner but certainly not leaning on it. I'll have another look but it seems odd that both the old and the new valve behave the same.
Valve is a San Marco like this
We have quarter turns in the bathroom and they dripped. Stripped the valve and cleaned the discs, but it only cured the issue for a short while. Replaced the valve in the end (you can get ceramic discs on their own).
Try swapping the cartridges over. Both acting the same suggest to me that you've changed the wrong one.