Even toilet cistern can have weird oscillator issues. I was in a block of
flats and used the toilet as the water was close to cut of it sounded a bit
like a badly played penny whistle. Luckily not my concern, but I did wonder
if the flat next door to the visitors toilet might be occupied by the
deafest member of the community!
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Jeff Layman" wrote in message
...
A couple of months ago we had a new boiler (regular) fitted. A couple of
weeks later my wife said there was a strange noise coming from the spare
bedroom en suite, which only occurred when I was using the basin in the
bathroom. I assumed it was something to to with the HW/CH pump. The next
time it happened I checked and was most surprised to find it was the mains
cold water pipe which fed the instant-heat shower that was vibrating. I
couldn't understand how the pump could be responsible, as it was nothing to
do with cold water and at least 10m from the en-suite pipe. It wasn't, of
course, and a bit of internet searching led me to the float valve on the
cold water tank; that was indeed the cause.

So yesterday I removed and cleaned it, but it made no difference; when the
tank filled and the float valve started to cut off the supply, the
vibration started again. Today I replaced the old float valve with a new
Pegler float valve. And the vibration is even worse - now we have a
foghorn! One thing I noticed was that it was possible to cut down the
sound by flexing the side of the plastic CW tank by pushing on the valve
inlet. When I removed the old valve I noticed that the reinforcing metal
plate was mounted horizontally, and that's the position I replaced it in.
But it seems to me the tank would be stiffer with the plate mounted
vertically, so that's what I'm trying. At the moment things seem to be
better, but they may not last.

If the noise returns, I'll try partially closing the tank isolator valve
first to see if that helps, as that's the easiest thing to do. If it
doesn't, I'll try the "yoghurt pot" dampener on the float arm.

But if all those fail, I think the easiest thing is to fit a Torbeck valve
instead of the standard float valve.

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Jeff