Description
The Schneider Electric (Barber Colman) MK-6911 is a proportional control pneumatic valve actuator engineered for reliable, precise valve positioning in commercial HVAC and building automation systems. Featuring a spring return mechanism and linear movement design, this actuator delivers consistent, fail-safe operation — returning to its default position upon loss of air pressure.
Key Features
- Proportional control for accurate, modulating valve positioning
- Spring return design ensures fail-safe operation on loss of air pressure
- Linear movement for direct valve stem actuation
- NEMA 1 enclosure for standard indoor installations
- 50 square inch diaphragm area for reliable force output
- 5–10 PSI pneumatic operating range
- 1/8″ NPT air connection for easy pneumatic line hookup
- 1-1/2″ nominal stroke for compatible valve travel
Specifications
- Model: MK-6911
- Brand: Schneider Electric (Barber Colman)
- Control Type: Proportional
- Actuator Type: Pneumatic
- Return Type: Spring Return
- Movement: Linear
- Enclosure Rating: NEMA 1
- Diaphragm Area: 50 square inches
- Operating Pressure Range: 5–10 PSI
- Air Connection: 1/8″ NPT
- Nominal Stroke: 1-1/2″
Application
The MK-6911 is ideal for use in commercial building HVAC systems where pneumatic control of two-way or three-way valves is required. Its proportional control capability makes it well-suited for chilled water, hot water, and steam valve applications in air handling units, fan coil units, and other hydronic systems. The NEMA 1 enclosure is appropriate for clean, dry indoor mechanical room environments.
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