Good explanation, hj.
I used to have a good cutaway pic of a solenoid operated valve, showinf all the ports. but I can't find it. Keep looking.
Here is the wiki version: http://en.wikipedia.org/wiki/Solenoid_valve
By the way, we should expand this discussion to include the fluidmaster fill valve! Figure that one out, with the little pin in the middle of the diaphragm!