mains pressure regulator

[Gyn_Paul]

I have a regulator on my incoming cold mains which chokes the flow pressure down to 3 bar, which is fine in terms of flow given that it's a big house with miles of 16mm PEC (which is therefore 12mm i.d.). However as soon as the taps are closed the STATIC pressure returns to the incoming 6 bar which makes both groupes de securitie dribble.

All the pressure regulators I can find on line seem to be variations on the same theme.

How do I get round this problem?

p

[Théière]

Your PRV is probably knackered. Pressure should not increase.

Or fit balons inline with hot water tanks.

https://www.caleffi.com/international/en-int/pressure-reducing-valves

[nomoss]

If the PR valve is working correctly it should isolate the high pressure from your system when there is no flow. See https://www.youtube.com/watch?v=r6qSkzx1imM

If you are getting full mains pressure at your water heater inlets, the internal valve or its seat is damaged or has a build-up of calcium on it, preventing it from seating properly.

[Chancer]

I had some fixed pressure regulators that worked exactly the same way, even worse they had a weep hole that let out a drip every few minutes, if I blocked that then the pressure rose in the system which was not a problem for me, just meant that the taps initially spurted.

 

I was making a multi-flat distribution system on the cheap and wanted to limit the pressure on the lower floors to priveledge the flow on the upper floors, the regulators that I used were intended to go on a garden tap for a hose so any drips would not have been a problem, proper regulators would not let the pressure bleed through and will have calcaire on the seat as others have described.