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Very mild but annoying 'water hammer' in toilet cistern fill valve?

Discussion in 'Plumbing and Central Heating' started by JamesB1976, 14 Sep 2019.

  1. JamesB1976

    JamesB1976

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    Okay, I admit up-front this is a tad feeble, but I'd rather ask the question than expend more effort and money (immediately at least). I recently replaced the siphon in my concealed bathroom toilet cistern after the diaphragm washer started to go. As well as fitting a Dudley Turbo 88 siphon (no more total disassembly next time) I also replaced the traditional float-arm fill valve with a Dudley 'Hyroflo'.

    Only after reconstructing the panelling etc. did I start to notice a weird noise coming from the cistern: when either the sink or bath cold taps are shut off and the cistern is full the Hydroflo valve briefly makes a strange 'fluttering' sound. A bit of reading seems to support my initial assumption that the new fill valve is much more sensitive, and is reacting to a pressure pulse caused by shutting off the tap(s) a.k.a water hammer. So to the question: would a small water hammer arrestor on the feed pipe to the cistern fix this? This is a long way from banging pipework and I'm concerned that there may be a threshold to how effective these things are, such that in my case it may make no difference? :eek:
     
  2. Did you fit the flow restrictor into the floatvalve tail?
     
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  4. JamesB1976

    JamesB1976

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    As this cistern has always filled quite slowly compared to downstairs, I removed the flow restrictor when fitting the new fill valve.....
     
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