The Flowrite SKB Advanced Feature Valve Actuator is used with Flowrite and other standard valves with a 3/4-inch stroke. This electronic valve actuator requires a 24 Vac supply to provide a 0 to 10 Vdc or 4 to 20 mA proportional control signal to the valve. Other features of this valve actuator include automatic stroke calibration, manual override, die-cast aluminum housing, 1000 lb (4000N) thrust, and spring return functionality