On Fri, 10 Oct 2003 00:13:08 GMT, "BigWallop"
wrote:

If it's plastic, then you have to adjust the pressure pin. You do this by
turning the bolt thingy on the ball arm, near the main body of the valve.
Two or three turns should be enough. If this doesn't work, then you'll have
to change the washer in the valve body itself. You should also see a bolt
between the valve body and the side of the cistern. Make sure this is
actually touching against the side of the cistern, because, if it isn't, it
actually allows the valve pipe to bend with the pressure of the ball arm
being forced upward by the water.

There is also the possibility that the ball has developed a small
hole, and is now "sinking" rather than floating. Easy to tell - take
the ball off the arm and shake it - if it has water inside then the
ball is compromised.

It is also possible that the arm on which the ball is held is rubbing
against the syphon mechanism. Make sure the ball can travel up and
down without catching.

The third possibility I can think of is that the small adjustment
screw which causes the valve to shut off when the float rises is
insecure, and over time has unwound enough to allow more water in.
Wind this screw in a little (and secure with the lock nut) so that the
water level is reduced.

Fixing the leak isn't the solution here, getting the water level right
is.

PoP