Tim S wrote:
I used one of these as my PRV:

http://www.hav.co.uk/products/shw-de...13086&cid=1099

Just done some flow measurements. My system is new-ish cock in the road
(blue water meter type witout the meter), 1/2 inch PE black pipe for about
15m to the house, jointed by me into 1.5m 25mm MDPE then into a 1/4 turn
full bore lever valve (inside cock) then into the above PRV. Static
pressure of mains is 7.5 bar.

I'm using one of these Caleffi valves at the moment to reduce the water
feed into the caravan we're living in (whilst our extension is done)
down to 1 bar so the plumbing doesn't blow. You can pick them up on ebay
for about 10 quid.