Thanks for your answers, but they do not completely answer my questions. All the valves i find at Orbit, Pope, Rainwise and Toro requires pressure (from a garden hose or pump) to function, and since im operating indoors i dont have pressure (only gravity). I could ofc skip the valves, and instead start and stop a pump. Is there any chance i can power a pump from the output stations like the 24v pump here:
http://www.westmarine.com/webapp/wcs/stores/servlet/Product_11151_10001_34118_-1#.UYg59Csd5NA (500gph 24V Bilge Pump, 3/4″ Port, 1.0A Draw, 1.5A Fuse, 3-1/2″H x 2-3/8″W)