On 22/07/2015 01:42, F Murtz wrote:
MM wrote:
I bought a set (hot and cold) of Bristan quarter-turn valves from
Plumb Centre almost exactly three years ago and this morning I noticed
that the cold tap was dripping ~very~ slightly. After a while it
stopped. Later, I turned on the cold again to fill the kettle, but it
didn't drip after switching it off this time.

A little spec of grit, maybe? How long are these valves supposed to
last?

MM

They rely on the pressure from the o rings(or what ever shape they
are)to seal and on some of the cheaper units they don't always do the
job forever


It would've been be a bit of grit in MMs case. The grit can get
temporarily trapped between the ceramic plates.