"Bob Mannix" wrote in message
...

"Rod Hewitt" wrote in message
...
Well good ol' neighbours. They have a problem with their water supply.
Several times a day it makes an awful noise - trying to describe it I
came up with foghorn - but a bit higher pitched.


It's possibly the toilet filling. One of ours does the same from time to
time. The contributing factors a the age and stiffness of the
ball-valve
diphragm (worse when its older and stiffer - as the actress said to the
bishop), the presssure of the water (higher=worse) and the temperature of
the water (colder=worse as the diaphragm gets stiffer) plus, of course,
the
resonant capability of the pipework. I changed the ball valve diaphragm
once
and it went away for a few months but comes back now when the conditions
are
right. It's only occasional now but I would probably add another pipe
bracket somewhere with a rubber sleeve next to change the resonant
frequency
of the pipes next if I could be *rsed.

You can generally stop it by opening a mains tap as this drops the
pressure
a bit - in fact you can tap out signals by turning it on and off if you've
nothing better to do - try it with next door's!

Just fit a shock arrestor next to the ball valve and stop messing about.