SQX62U Valve Actuator, 150 lb. Torque, 24 Volts AC, Proportional Control, Fail-In-Place This Flowrite SQX Valve Actuator is designed for use with Flowrite 599 Series valves with a 3/4 INCH stroke. This fail-in-place electronic valve actuator requires a 24 volts AC supply, and receives a 0 to 10 volts DC or 4 to 20 milliamps control signal to proportionally control the valve. Other features of this valve actuator include 150 pound torque, manual override, die-cast aluminum housing and automatic calibration.