wrote in message ...
On 4 Nov,
Kevin Poole wrote:

No mechanical gauge at all, I'm afraid. The question of why the prv
didn't operate is one that's been bothering me in the dark watches of
the night. Starting fault-finding at 10pm in someone else's house is
not ideal for a day-person, so I didn't think to check the flow rate at
his cold tap, either. The prv isn't stuck - I manually released it OK,
so what pressure do they normally blow off at?

I've almost never had enough pressure to lift my PRV which is set at 3.5
bar.
My mains pressure seems to top out at 2.5bar. At one time (before they
built
a local service reservoir) it would occasionally get high enough in the
dead
of night to lift the PRV.

Do you keep the filling loop tap permanently on?