Banging noise when we flush toilet?!

madmoose_2

Hello, hope someone can shed some light on this problem we're having!

Whenever we flush our toilet it makes a banging noise for around 2 minutes afterwards! It's a bit embarrasing when people come round and use the bathroom as it can be quite loud!

It goes quiet when if we put the tap on straight away after flushing.

I'm baffled and don't know what to do, don't want to have to pay for a plumber to come in unless we know what the problem is.

Please help!!

fad1211

We had exactly that same problem last week. It is a very minor part in the tank that has gone and it cost me a fiver to a local plumber who sorted it in under 10 minutes. You need a part but cannot remember what he said it was, but very cheap. Good luck. The fiver included the part and his labour, but then again I do know him.

uncle_buck_3

The banging noise will more than likely be the ball valve bouncing up & down as it is just about to close off when the toilet cistern is nearly full. The ball valve bouncing is just like you opening a tap fully& then closing it again very quickly…this creates a banging noise know as water hammer.

More details here: http://www.diydoctor.org.uk/projects/noisypipes.htm


HTH

beefster

We have the same problem since installing single lever taps. The swift closing acion causes a "bang-bang" in the mains supply pipework. this is only cured by slowing the water flow down via the stop !!!!.
This is a little infuriating as it drops the shower pressure via our combi boiler which could be equivalent to a power shower if we could only fully open the flowrate.....
I am at a loss as to its cause, I have modified the pipework to remove abrupt bends and dead ends but its still no better. It still happens even when the cold water tank is isolated so cant be due to the ball valve bouncing.

Any ideas? I would love to have my shower on full blast!

robnye

you could fit a small on/off valve on the pipe to the tap...... cant think what there called (proper name), but they act like a mini stopcock.
I had the same problem, but since i replaced the old one on my toilet it is better,

Gambler

we had a drip drip annoying sound in the ensuite for ages after flushing and couldn't get to sleep.

Plumber fitted some new kitchedn taps the other day so asked about this problem. He fitted something new and now we too get this banging when

a) we flush the ensuite loo
b) we use the kitchen taps


!!!

beefster

Ask the plumber what he fitted..... probably a torvek / quiet fill cistern valve. They cut off the water instantly rather than the gradual reduction of a traditional ballcock. Mine made the same noise until I throttled the pressure down using the isolation valve.

If the kitchen taps are the single level type, ie a swift on /off then its prob a similar problem with the abruptness of the off from full flow. I have this prob too and throttling down on the stopcock is the only way out I have found to stop it.

calmgirl

Its not any of the above its the liitle men in brown that live in you toilet they are using morse code to send messages further down the pipe to get out of the way.


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gerrygoacher

Just go to any D I Y shop and buy a new washer for the inlet valve on the tank 20p, 5 minutes to fit

moneysavingplumber

If you have high pressure then throttling down an isolating valve can increase noise problems. Water hammer and water bounce (for example, flushing the toilet causing a combi boiler to fire intermittently) are often caused by the concussive nature of the valve causing the loose jumper in the mains stopcock to vibrate. If the water pressure is excessive then the best solution is an adjustable pressure reducing valve. An alternative and a cure to the problem described above as water bounce is to fit a double check valve immediately after the incoming mains stopcock, followed immediately by a mini-expansion vessel. Torbeck valves can help but do not always solve the problem, and using the restrictors they provide often slow the flow rate through the valve to a less than acceptable rate in my opinion. True Equilibrium Pegler ball valves are difficult to find and do not usually incorporate the correct air gap to comply with water regulations. They also wouldn't usually fit the average WC cistern and would only be suitable for cold water storage tank use in conjunction with a double check valve.