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I wish to have two distinct circuits. One with Arduino and a 9V battery as power source. The second related to tip120 darlington as valve driver with 12 power in. And a flat cable that connects the first board to the second. So to use first circuit as portable trigger with the optional input you suggests. This is since a 12V power source binds to a home photo set, while a small circuit with a 9V battery is more portable also outdoor.
And with the flat cable that carries D7, D8 and D9 signals to tip120 base. The idea is to have
a) processor (arduino and optos) (9V)
b) valve driver (12V)
c) cable (D7,D8,D9, ground)
d) optional trigger (connected to processor)
I was trying to separate ciruit but I have some doubt on the ground signal.