In an earlier contribution to this discussion,
raden wrote:

In message , Phil Addison
writes

The literature refers to a 'wedge' type actuator. Anyone know what
that means?

Where did you find that literature Roger? I couldn't find anything
further on that site. Mark says of his "its like a rubber wedge".

There is a style of valve with a triangular (like a cheese) section

This is to make the rubber perpendicular to each port as it swings
from one side to the other (badly explained, but YKWIM)

So they're referring to the paddle inside the wet bit of the valve? That's
confusing 'cos, to most of us, 'actuator' means the dry bit containing the
electric motor!
--
Cheers,
Roger
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