"fred" wrote in message ...
In article , Set Square
writes
Honeywell seems to have a reasonable reputation - so something from the
V4043 range should do the job. If you're worried about flow restriction,
you
could use 28mm
valves - with adapters either side to connect to your 22mm pipework.
However, a very short length of restriction is not usually too much of a
problem.
My vote goes for Honeywell too as they have had the same (simple) design
for years and are likely to have the same for the foreseeable future so
spares won't be a problem.

As to the 28mm valve thing, I think all the valves under a given base
number use the same basic internals with just a different size fitting, so
the level of restriction is about the same for 22 & 28mm models. If using
22mm pipe, keep it simple & use a 22mm valve - cheaper too.

Look inside a 22mm and 28mm together. the 28mm is bigger.