have a Milano Elizabeth shower mixer, often when I open the flow valve fully there is no flow at all, it is fully pumped, but a flow is possible without the pump on, if I move the temperature control slightly back and forth the flow returns. Usually this happens when first operated but sometimes even if the flow is turned off during a shower.
my thoughts are maybe there is an internal Non return valve, which is sticking.....my plumber says never seen this issue before......any thoughts please ?
It was ok for the first week, then started playing up, is it likely to have NRVs internally ? Bot hot and cold come from a Stuart Turner 2.5 Bar pump, but without the pump on I can get a small flow, but when it goes ‘wrong’ there isn’t a single drop ?
the pump setup isn’t the problem, it worked perfectly with 2 previous shower mixers.....the supplier tech person phoned me and suggested it’s the built in NRVS that’s the problem and I should remove them, but don‘t see how both could stick at the same time to have a zero flow.....earlier the mixer played up again with no flow, I turned the shower pump off, then tried the temperature control as before but made no differenc, so lowered the shower head to the shower tray and the flow resumed, so that must mean something......will tell the supplier tech person next time we talk, just need to identify the issue
1- pump ok with previous shower mixers
2-No Flow situation occurs with or without the pump switched on
3-usually turning the temperature control knob restores the flow, but not always
4-new finding lowering the shower spray to the shower tray floor restores the flow.
5- does t always happen when first turned in can get a No Flow during a shower if it’s turned off temporarily
The old mixers I bet you were suitable for gravity your new one is a high pressure one requiring a uni or negative head pump hence the no flow problem as yours needs a minimum of 1 bar should be 0.1-0.2 minimum for a positive head pump
does that mean that lowering the shower head 5m’ would be enough to get a flow ? Is there a fix ?......once it starts flowing, without a pump I can put the shower head back in its cradle and the flow continues
Or maybe removing the NRVs and cleaning / changing the shows head may help, they did specify a minimum of 0.5Bar, but I showed it to my plumber before we bought it amd he said ok go ahead and order it......
what is a negative head pump fitting can this be retro fitted ?
The header tank water level is approx2m - 2.5m above the shower head. Is it easy to determine the head pressure ? And is head pressure gain linear ? Wonder how much I would need to raise my loft tank to make a difference. Hopefully wouldn’t need much, as sometimes it works, thanks
Thanks, I wonder how much benefit I would get by removing the internal NRVs ???
if not enough could raise the left tank a metre.... hopefully would be enough as it’s an intermittent problem.
Hi, Can anyone advise as to why the cold water to my bathroom keeps airlocking?
This originally happened about 12 months ago and has happened 3-4 times since.
It’s an upstairs bathroom, fed from a tank in the attic. The tank is about 8 Meters away and feeds a bath, sink and toilet. The tank...
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