See Star Fertigation Instructions for details. A worm gear in the motor prevents backdrive and maintains a good valve seal. When fully charged it can keep the unit operating for 14 days with no input from the solar panel. The valves are T shaped, cast aluminum diverters which take water in on one port and deliver it left or right to the other two ports. The butterfly valve is activated by a motor in the controller.
All valves have a male port at the entry and female ports at the two exits.
GPM Width Weight Valve size refers to the outside diameter of the hard pipe used to connect to the valve. Volume handling capacity of each size valve will vary with water pressure and friction losses downstream of the valve.