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Default Flow restrictors

Darren wrote:

I have just had a new combi boiler fitted, so my bathroom water is now at
mains pressure.

My basin taps are Monobloc, Ceramic disc, Dualflow, Dual control. To
prevent water splashing everywhere due to the very high flow rates I have to
only slightly open them (a fraction of a turn). The problem is I now get a
horrible high pitched noise from the taps when they are only slightly opened
(goes away when opened more fully). When I suggested fitting isolating
valves and partially closing them, the plumber said I would get a similar
noise from the valve instead.


perhaps, but likely not. If you want to get the most silence, put the
valves under the floorboards and put pipe lagging over as much of the
pipe and valve down there as possible. Lagging acts as acoustic
damping. The heavier the lagging the better.

Another option is to remove tap from pipe and insert some potable rod
in the pipe. Restriction over a longer length is far less prone to
generating any noise. Maybe a bit of microbore, squashed at one end.


NT