In an earlier contribution to this discussion,
Kevin Thornton wrote:

I have acl drayton 2 port valves - on the side of each is a switch
marked A and B - what is this for?

cheers

I assume that it's an independent switch (i.e. not electrically connected to
the motor wiring) which closes when the valve is fully open, and can be used
to switch your boiler and pump on. This is how 2-port zone valves are used
in S-Plan heating systems.

--
Cheers,
Set Square
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