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bobcroft In a nutshell you do not know if it is opened or closed because there is no feedback. However, since the valve is opened by say brown / green wires and closed by blue and green wires then green is neutral. Therefore if the brown wire is energized the valve will be open, if the blue wire is energized it will be closed. Once open or closed the power to the motor is cut off via a micro switch to stop it over heating. So it it is open, brown wire live, the you can only close it by applying power to the blue wire. Alternatively it could be blue open / brown close, either way the working principal is the same. It does not work by opening when power is on and close when power is off. It has to be powered both ways as I described.
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