The ML6421A,B Non-Spring Return Electric Linear Valve Actuators are suitable for use with low-voltage, single-pole double-throw (SPDT), Series 60 two-position and floating controllers. These actuators operate standard Honeywell valves in heating, ventilating and air conditioning (HVAC)applications. The ML7421A,B Non-Spring Return Electric Linear Valve Actuators are modulating control actuators used with control that provide an analog output of 0 to 10 VDC or 2 to 10 VDC. These actuators operate standard Honeywell valves in HVAC applications. An internal selector plug can be used to reverse the direction of action. Honeywell Electric Valve Actuator, Linear, 1-1/2 in Stroke, 405 lbf Output Torque, Non-Spring Return Valve Design, 5 to 95% RH Operation, 11 VA Power Consumption, 175 s at 60 Hz Timing, 2 Position/Floating/SPDT Signal, 24 V AC +10%, -15% Supply, Screw Terminal Electrical Connections, 14 to 122 deg F Ambient, Direct Mounting, For Use With: Model V5011/V5013 Globe Valve and VGF Flanged Globe Valve, Import