| Saro is right. I have a six port polak. I think varying the polarity to the main solenoid positions the valve seals one way or the other. Internal switches de-energise the solenoid and provide feedback of selected ports. I chose not to use it in the end opting for a more fail safe setup.
Steve Izett
This is the type that I'm referring to:
Is anyone familiar with electric fuel selector valves as used in
automotive applications. I'm trying to figure out how they operate. Do
they select one line when power is applied to a solenoid type plunger,
and then the other line is selected when power isn't applied? Or does a
pulse of power switch them back and forth? If they maintain the
currently selected tank when power is absent, it seems to me that this
could remove fuel lines and a leak prone selector valve from a lot of
cockpits. Furthermore, the 6 port models look like they could be
plumbed easily to handle return lines.
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