Skip Ribbon Commands
Skip to main content
  • Product Info
  • Literature


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.


  • Easy and quick installation on valves with 1 3/8 in. bonnet and 3/4 in. stroke, or with 1 7/8 in. bonnet and 1 1/2 in. stroke
  • High force for VGF Pressure-balanced valves
  • No separate linkage required
  • Conduit connector standard
  • No adjustments required on linkage
  • Accurate valve positioning
  • Low power consumption
  • High close-off ratings
  • Force limiting end switches
  • Manual operator
  • Synchronous motor
  • Maintenance free

Product Specifications

1/2 in. conduit hub; 1/2 in. flexible conduit adapter
Directly on V5011/V5013 Globe Valves and VGF Flanged Globe Valves
Approvals, Underwriters Laboratories Inc.
Flammability Rating UL94V-5V
Approvals, Canadian Standards Association
Electrical Connections
Screw terminals
Shipping and Storage Temperature Range (F)
-40 F to +158 F
Shipping and Storage Temperature Range (C)
-40 C to +70 C
Approvals, CE
Ambient Temperature Range (F)
14 F to 122 F
Ambient Temperature Range (C)
-10 C to +50 C
Environmental, Electrical or Ingress Protection Rating
Class I Insulation (24 Vac),IP54
Internal Auxiliary Switch
Fluid Temperature (C)
150 C Maximum
Fluid Temperature (F)
300 F Maximum
Actuator Type
Control Signal
SPDT; Two position; Floating
Fail Safe Mode
Stays in place
Torque Rating (lb-in.)
405 lbf
Torque Rating (Nm)
1800 N
Stroke (in.)
3/4 in.
Stroke (mm)
20 mm
Two knockout holes for 1/2 in. conduit standard on actuator case
Manual operation
There is no literature attached to this product, please try another material search. If you believe that there should be literature for this product, please contact Customer Care for website support.