High pressure cold feeder pipe noise


I think I have finally worked out the archaic piping in this flat, but have a question for anyon knowledgeable out there... There are two cold water pipes. One is large and iron and feeds my cistern, and the rest of the building. the other is small (15mm) and copper, and makes an awful racket from time to time.
It seems to me that the large pipe is probably low pressure out, and the narrow high pressure in. Obviously with a high pressure pipe there is lots of scope for noise. This noise is oftem of varying amplitude, and is sometimes accompanied by a whistling. I would guess that this is due to the ballcock causing pressure fluctuations within the pipe, and also acting like a musical flute. Does this sound plausible?
Is the best bet to replace the cistern valve? I would guess that vibration and noise is most likely as the pressure in the pipe is varying due to float movements. A new valve that switches from full flow to zero flow rapidly might be better...?
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Ben wrote:

Yes, I think you are on the right track.
If the new valve closes *too* fast, there is a possibility you could hear a "thump" or rattling. In that event, add an air chamber to the pipe, near the cistern to absorb the shock wave.
Jim
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A few not very scientific tests later....
Fkushing the loo initially causes a racket. It then quickly quietens down. Then the racket then starts again and lasts much longer. Then quiet.
I suspect this can be explained by:
Water level drops as loo flushes Ballcock rapidly falls, opening valve fully While it is opening, we get noise Once fully open, peace and quiet As tank nears full again, valve starts to close Tank takes forever to fully fill, as valve closes further the close it gets Hence long drawn out noise
I'm guessing some clever person must have come up with a robust solution to this? The fluidmaster valves look like they might do (and also look very quiet - filling underwater), but look a bit plasticy and breakable...
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A few not very scientific tests later....
Fkushing the loo initially causes a racket. It then quickly quietens down. Then the racket then starts again and lasts much longer. Then quiet.
I suspect this can be explained by:
Water level drops as loo flushes Ballcock rapidly falls, opening valve fully While it is opening, we get noise Once fully open, peace and quiet As tank nears full again, valve starts to close Tank takes forever to fully fill, as valve closes further the close it gets Hence long drawn out noise
I'm guessing some clever person must have come up with a robust solution to this? The fluidmaster valves look like they might do (and also look very quiet - filling underwater), but look a bit plasticy and breakable...
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Ben wrote:

The FluidMaster has a good reputation on this side o' the pond :-)
Breakage really hasn't been a big problem.
For repairs (seldom needed) the top just pops off. Jim
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Thanks -I'll give it a go. The council have the key to the loft, so I'll have to try to prise it off them... btw, which side of the pond is "this"?
Cheers,
Ben (UK)
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Ben wrote:
<SNIP>

"This" side is the western shore.
Cheers,
Jim (US)
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Ben wrote:

On further consideration, I wonder if the FluidMaster will be large enough (i.e., flow-wise) to keep the cistern full under maximum draw. The cistern is common to all the tenants, right?
Also, with many demands for water, the FluidMaster might be switching On/Off rapidly, rather than gently modulating the flow as the ballcock is supposed to
Hmmmmmmm
Jim
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That's a point. I'm not sure exactly how many people the tank serves, but I'll maybe have a chat with the local plumbers merchants. I don't think it can be the whole block (40 flats) as it doesn't fill regularly enough. I'd guess it's about 10 flats. I can't be the first person to have had this problem, and I can see no technical reason why a robust, large solution could not be produced. I suppose you could plum in a few in parallel (yuck, but should work!)
Ben
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