I have just replaced all the cisterns in our toilets with the special quieter ones which are great, however, when the toilet is flushed and the fill up finishes there is a loud single bang when the water is shut off. I have turned down the amount of water coming into the house at the mains valve which does help. Any suggestions to cure the problem totally would be appreciated.
Single Bang
- Thread starter David Aston
- Start date
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Is there a flow restrictor supplied with the valve fitted on the valve inlet? They are often a piece of plastic with a deep screw thread. They fit in the valve inlet to reduce the flow so the valve doesn't snap shut with a bang when it closes.
There are often different ones fitted according to water pressure. Use a 'finer thread' one for higher water pressure.
There are often different ones fitted according to water pressure. Use a 'finer thread' one for higher water pressure.
I've found Torbeck valves often going bang even with the helical inserts fitted. FluidMaster are better.
You could try fitting a service valve if there isn't one and nearly closing it, which defeats the object...
You could try fitting a service valve if there isn't one and nearly closing it, which defeats the object...
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You need to find out where the bang is coming from. It could be a 'dead leg' of cold water piping that is full of air. When a cistern valve closes sharply, the inertia of the water flow stopping suddenly compresses the trapped air and (possibly also causing physical pipe movement) makes a bang. Just loose pipes (missing clips!) can also produce this sort of noise.
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