Mains Water Pressure. What is "typical"?

Not so.

That is just plain WRONG.

For example as I found out recently my mains pressure HW cylinder has a regulator on the input. When the pressure rises above 2.1 bar it shuts off flow into the tank completely. There is an air bubble pressure maintainer so that there is 'elasticity' in the system.

The valve on your loo shuts off input completely. That does not mean the cistern is at 10 bar!

You are thinking of flow reduction as a means to achieve pressure reduction. Then what you say applies, but that is not what a proper pressure reducer does.

That was my initial thoughts as well, but I think it depends on just how pedantic he is being

Lock Up Pressure ?Lockup pressure? is the pressure above the set-point that is required to completely shut the regulator valve off and insure that there is no flow.

But I suspect that for domestic plumbing applications the difference between lock up pressure and set point pressure will be lost in the noise.

No I think he is being very pedantic

I think 3 to 4 bar is better water pressure but it's depend our use water system

You are lucky we have only 1.2 Bar

Ouch, I'm surprised, are you sure of the accuracy of the measuring device?

Most (metal) domestic plumbing bits are only rated to 10 bar. Plastic and hot a lot lower. A little bell is ringing that says the maximum mains pressure ought to be about 6 bar. See what the Ofwat site has to say?

I expect the OP will be glad to hear that after 10+ years! (if they're still alive!)

As this was all discussed back in 2009 I suspect it all been resolved by now.

Tim

Why did you bring back an old thread for this from 2009? Brian