I'm fitting a mira excel shower but I'm confused. The instructions say
a drop tight pressure reducing valve (PRV) to be fit if the supply
exceeds 5bar maintained. I suspect that my pressure is quite high (it
comes out of the cold tap a lot faster than the hot tap) the hot tap is
fed by a worcester 25si which I understand provides hot at 2.5 bar.

The shower instructions also say the shower works best if the two
supply pressures are equal.

Does a PRV allow you to set the output pressure to a certain setting?

Alternatively I've seen some pressure equaling valves he

http://cgi.ebay.co.uk/Pressure-reduc...QQcmdZViewItem

Should I try one of these instead?

Any advice / Experience of Miras appreciated.

Thanks.