I am thinking that all the valves are parallel, because though all the valves run off one central valve with solenoids opening and closing them. I figure it would take 110 volts for each valve to open. I have the whole schematic, I could upload it. I'm not to familiar with these micro controlled circuits, but I would like to learn how to read the schematics for them. Let me know if your interested and I could upload the whole schematic. Then I could delete it later. Thanks.