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Pneumatic Damper Actuators

MK4-71xx Series

For proportional pneumatic actuator with 20 sq. in. (129cm²) effective area used to control damper and air valvesin heating, ventilating, and air conditioning systems.

MP-52xx Series

These actuators provide electronic proportional control of dampers, valves, or program switches requiring the return to normal position upon power interruption.

MP516

Used to control the damper on unit ventilators. Can be adapted to various unit ventilator control cycles. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell unit ventilator damper actuators.

MP909D

Used for pneumatic proportional control of variable volume terminal units and small damper. Available in various operating ranges for either individual or sequence operation with other actuators. Replacement devices are available for Johnson, Powers, Robertshaw, and older Honeywell actuator...

MP909E,H

These actuators are used for proportional control of variable volume terminal units, mixing boxes, and small to medium sized dampers. They are available in various operating ranges for either independent operation or sequence operation with other actuators. The MP909E has an optional adjustable...

MP918A,B

Used for proportional control of medium- to large-size dampers in HVAC systems. The MP918A,B are rolling diaphragm, piston-type actuators. The MP918A has a positive positioner. Replacement devices are available for Johnson, Powers, Robertshaw, Barber- Colman, and older Honeywell actuator models...

MP920

Provides proportional control of large dampers in HVAC systems or inlet vanes on a VAV fan. Positive positioner available separately. Replacement devices are available for Robertshaw actuator models.

N800-0555 Series

The N800-0555 is used with M556 (6 in. stroke), M573 (3 in. stroke), and M574 (4 in. stroke) damper actuators. The N800-0555 is pilot-operated, providing excellent response to small signal pressure changes from the controller. Pilot-operation also provides maximum resistance to actuator shaft...

No. 3

Designed with a 2-3/8-inch (60 mm) stroke, the No. 3 Pneumatic Actuator is a rugged, metal-fabricated device that provides gradual or positive actuation of HVAC dampers. The actuator is available in a variety of spring ranges for energy optimizing and sequencing with other devices.

No. 4

Designed with a 4-inch (102 mm) stroke, the No. 4 Pneumatic Actuator is a rugged, metal-fabricated device that provides gradual or positive actuation of HVAC and fire/smoke dampers.

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