In an earlier contribution to this discussion,
mike ring wrote:

"Set Square" wrote in
:


The only satisfactory cure is to convert from a Y-Plan to an S-Plan
by throwing away the 3-port valve and replacing it with two 2-port
valves.

I'm proposing to do just that SS, but could you suggest a good valve
- in particular I'm looking for minimum constriction (my existing
3port valve has diddy holes for the coolant (heatant?)


I have limited direct experience of a wide range of makes from my DIY
perspective. The professionals are likely to be able to advise better.

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.
--
Cheers,
Set Square
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