Adjusting a toilet ball valve
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General advice
- Check to see if a service valve is fitted. If a service
valve is fitted, the water supply to the cistern can be turned off temporarily.
To turn the water off, turn the screw on the service valve a quarter turn.
- If the ball float does not float, it needs to be replaced
by a plumber. Contact the repairs hotline to arrange for the work to be
carried out.
- You can stop the water flowing temporarily by placing
a piece of wood across the top of the cistern and tying the float arm to
it.
You need
- Small screwdriver
- Small adjustable spanner
What to do
- Remove the cistern lid and flush the toilet. Then lift the ball float
up and check if the water flow stops.
- If the water does not stop, the ball valve needs replacing or rewashering.
- If the water flow stops, the ball valve needs adjusting.
- If the ball valve is the older, metal piston type, carefully bend the
float arm to push the ball float down about one inch (25 millimetres). Then
let the cistern fill and check the new water level. Adjust the float arm
again if necessary.
- If the ball valve is the modern, plastic diaphragm type, loosen the lock
nut (turn anti-clockwise), turn the adjusting screw on the float arm a couple
of turns (clockwise) and tighten the lock nut. Let the cistern fill and
check the new water level. Adjust the float arm further if necessary by
repeating the above procedure.