Help please its driving me mad!

Rickster123 · Oct 29, 2015

Shock arrestor... Still...

Darren · Oct 29, 2015

steveb said:
no all that is happening is that at different times of the day there is differing demand on the mains i.e. over night there will be less demand so pressure rises and during the day there is more demand so pressure will be lower.

Ok but on the evening 8pm it was reading 3.5bar nothing using water and in the morning 5am it was 1.5bar nothing using water and as the gauge is after reducing valve I thought it should always show the set pressure not fluctuating supply?

AWheating · Oct 30, 2015

you need to take the reading on the gauge while you have a tap running and set it as a working pressure.

it sounds like the main has a fluctuating pressure and has probably had an increase in pressure from work or being turned up by the supplier which is not uncommon when demands increase and decrease. this is more common in industrial areas.

Darren · Oct 30, 2015

AWheating said:
you need to take the reading on the gauge while you have a tap running and set it as a working pressure.

it sounds like the main has a fluctuating pressure and has probably had an increase in pressure from work or being turned up by the supplier which is not uncommon when demands increase and decrease. this is more common in industrial areas.

I'll give that a go.
I still don't understand how if I set the pressure on the gauge which is on the outlet side of the valve at 2bar any fluctuation on the inlet pressure, increases the gauge reading as it has to pass through the PRV which is set to 2bar. This would suggest it's not working or am I get things confused?

Darren · Nov 4, 2015

Darren said:
I'll give that a go.
I still don't understand how if I set the pressure on the gauge which is on the outlet side of the valve at 2bar any fluctuation on the inlet pressure, increases the gauge reading as it has to pass through the PRV which is set to 2bar. This would suggest it's not working or am I get things confused?

I'm still a little confused regarding the above or if the PRV is working as should but after playing around only one toilet was causing the bang. I've fitted a fluid master 400 flush valve to that cistern and hey presto bang has gone on that toilet too, so I opened the PRV up fully and my other toilet began to cause a bang after flushing so I changed the rubber washer, still the same so I have replaced the 10yr old fluid master 400 in that cistern with a new one and it has now stopped causing a bang as the water shuts off.
My water pressure visually does seem higher than it used to be but the gauge only shows a max of 3-4 bar is this high or not? If the PRV is working correctly I'll keep it, incedentally I fitted it in the vertical position as the instructions said this could be done and ther was minimal work involved fitting it in that position, could that be a reason why I'm getting varying reading on the gauge? As I said before I was under the impression if I set it to a reading of 2bar on the gauge it wouldn't matter what the supply pressure was as the gauge is after the valve which should be controlling it at the set 2bar.