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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

Dimensions (in.)
10 3/8 in. high x 7 in. wide x 7 in. deep
Dimensions (mm)
264 mm high x 178 mm wide x 178 mm deep
1/2 in. flexible conduit adapter; 1/2 in. conduit hub
Weight (lb)
5.1 lb
Weight (kg)
2.3 kg
ABS Plastic
Item Type
Directly on V5011/V5013 Globe Valves and VGF Flanged Globe Valves
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
Flammability Rating UL94V-5V
Approvals, Canadian Standards Association
Electrical Connections
Screw terminals
Operating Humidity Range (% RH)
5 to 95% RH
Supply Voltage
24 Vac +10%, -15%
Power Consumption
Driving-- 12 VA
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
IP54,Class I Insulation (24 Vac)
Internal Auxiliary Switch
Fluid Temperature (C)
150 C Maximum
Fluid Temperature (F)
300 F Maximum
Actuator Type
Control Signal
0 to 10 Vdc; 2 to 10 Vdc
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
Timing, Nominal
Driving @ 60 Hz-- 95 sec
2-10 Vdc
Manual operation
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