Foghorn plumbing

[Squishey]

The diaphragm in my downstairs toilet had split so I replaced the whole syphon. While I was at it, I also replaced the fill valve and ballcock. After this whenever we flush either toilet or run a tap that's connected to the CW tank (including hot taps) we get the pipes reverberating causing a noise like a foghorn.

I've had a Google and that suggested that I may have used the wrong restricter in the fill valve. I swapped that but the noise continues.

Any other suggestions?

[iambigred]

I had a similar problem, was caused by the fill-valve. Until I replaced it I reduced the water pressure to the WC slightly by turning the isolator in order to fill the cistern slower, this alleviated the issue.

[Squishey]

I've replaced the fill valve for one with an integrated float but I'm still getting the occasional groan. I don't have a local service valve so can't turn the toilet pressure down.

Is it likely to be the ballcock in the CW tank 'bouncing'? Air in the system?

Any pointers would be much appreciated.

[V8RX7]

Restrict the fill valve.

Fit an isolator.

[g7jtk]

Squishey said:

I've replaced the fill valve for one with an integrated float but I'm still getting the occasional groan. I don't have a local service valve so can't turn the toilet pressure down.

Is it likely to be the ballcock in the CW tank 'bouncing'? Air in the system?

Any pointers would be much appreciated.

Smear silicone grease all over the diaphragm and the plumger

[carreauchompeur]

g7jtk said:

Smear silicone grease all over the diaphragm and the plumger

Stop talking mucky

[g7jtk]

Sorry. Predictive text and me not reading it back properly.

Smear silicone grease on the diaphragm washer and the plunger.