On 16/11/2017 08:58, DerbyBorn wrote:
Steve Walker wrote in
news
http://www.upperplumbers.co.uk/image...g/Upperplumber
s_twin_entry_radiator_valve.jpg

Sorry - never seen that one before - I believe mine were called Twinfast
Valves and all had a balancing screw.

That's fair enough, the ones you had made for a simpler system. The ones
my parents had didn't require any adjustment to balance the system, but
did require full calculation of the installation beforehand to ensure
that the system was balanced by pipe lengths and bores.

SteveW