On Fri, 16 Feb 2018 11:06:07 -0800, Murmansk wrote:

I've been asked to sort out a toilet cistern that keeps on filling and
so overflowing.

Photo of offending item he

https://www.dropbox.com/s/vtfogxvkne...29.04.jpg?dl=0

Is it just a case of removing the circular blue bit and replacing a
washer or diaphragm or something inside there?

Looked at the picture, and as I suspected, it's a Torbeck valve. These
are very prone to grit and dirt. Whenever they do work on the underground
water pipes round here, there's a chance that ours will do this.

Turn off the water supply (with luck there's a service valve in the
cistern feed). Remove the blue ring (probably very stiff) and withdraw
the body of the valve. There's a flat rubber washer with a white plastic
spike and a tiny hole with a plastic insert; that may be left behind, in
which case pull it out. Clean that all thoroughly. Use a water pistol or
something to wash out the housing attached to the cistern.

Gently unclip the swinging part of what you removed. Blow through the
tiny hole; I use canned air. Wash it all thoroughly.

Clip the swinging part back on. re-seat the rubber washer; the hole in it
fits over a little metal pin in the housing; get this right or you'll
puncture the washer. Replace housing and blue ring. It often has to be
done up quite tight.

Turn the water back on. If necessary, rotate the float on its 'screw
thread' to set the correct water level.

Make sure there are no leaks between the housing and the valvel body; if
there are, do the blue ring up a bit more.

If it still overflows, it's worth another go. Otherwise, new washer or
valve!



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