OldScrawn wrote:
I'm after a 22 mm motorised "changeover" valve (i.e. it would be SPDT if it
were electrics). As far as I know, central heating "3 port" valves give you
"one or both" rather than "one or the other". I could just use a Tee and two
"zone valves" with a relay to do the changeover, but can anyone suggest a
supplier for what I actually need? It's a very light industrial use (less than
once per day) so I was looking for central heating rather than serious
industrial type prices. Brass will be fine. Any advice on relative merits of
Danfoss / Honeywell?

My 3 port valve, which AFAIK is pretty standard, is SPDT.
There's a rubber flap, which either sits one way, the other way,
or in the middle (both ports open).

--
Grunff