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Used for proportional control of medium- to large-size dampers in HVAC systems. The MP918A,B are rolling diaphragm, piston-type actuators. Positive Positioner available. Replacement devices for most competitors products


  • Rolling diaphragm operated.
  • Low friction shaft bearing.
  • Close tolerance on operating range and stroke.
  • Versatile mounting and connecting hardware.
  • Non-overlapping spring ranges for sequencing.
  • Reliable-long life.

Product Specifications

Dimensions (in.)
20 1/2 in. long x 8 in. high x 6 5/8 in. diameter
Dimensions (mm)
520 mm long x 205 mm high x 168 mm diameter
Maximum Safe Operating Pressure (psi)
25 psi
Maximum Safe Operating Pressure (kPa)
172 kPa
Temperature Range (F)
-20 F to +158 F
Temperature Range (C)
-29 C to +70 C
14004062-002 - Internal N.C. Trunnion Mounting Bracket with pushrod assembly. Positive Positioner
Approvals, Underwriters Laboratories Inc.
Components Recognized: Report R18118
Operating Humidity Range (% RH)
5 to 95% RH
Actuator Type
Fail Safe Mode
Spring Return
Stroke (in.)
3 1/2 in.
Stroke (mm)
90 mm
Actuator Force
Spring Range (psi)
Positive positioner 10 psi span (5 psi spring included)
Spring Range (kPa)
Positive positioner 69 kPa span (34 kPa spring included)
Diaphragm Effective Area (sq in.)
23.8 sq in.
Diaphragm Effective Area (sq cm)
154 sq cm
Air connections
5/32 in. push-on barb (Pilot), 1/4 in. push-on barb (main.)
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