Description
Schneider Electric (Barber Colman) MK-6811 Proportional Control Pneumatic Valve Actuator
The Schneider Electric (Barber Colman) MK-6811 is a heavy-duty proportional control pneumatic valve actuator engineered for precise, reliable valve positioning in commercial and industrial HVAC systems. With a 50 square inch diaphragm area and a spring return mechanism, this actuator delivers consistent linear movement and automatic fail-safe positioning whenever air supply is interrupted — a critical safety feature for building automation and hydronic control applications.
Key Features
- Proportional control operation for precise, modulating valve positioning
- Spring return design ensures automatic fail-safe valve positioning on loss of air pressure
- Linear movement for direct-coupled valve stem actuation
- 50 square inch diaphragm area for strong, consistent actuating force
- Operating pressure range: 5–10 PSI pneumatic signal
- 1″ nominal stroke for accurate valve travel
- 1/8″ NPT air connection for easy pneumatic line hookup
- NEMA 1 enclosure rating for indoor installation in clean environments
Specifications
- Model: MK-6811
- Brand: Schneider Electric (Barber Colman)
- Control Type: Proportional
- Actuator Type: Pneumatic, Spring Return
- Movement Type: Linear
- Diaphragm Area: 50 square inches
- Pneumatic Signal Range: 5–10 PSI
- Nominal Stroke: 1 inch
- Air Connection: 1/8″ NPT
- Enclosure Rating: NEMA 1
Applications
The MK-6811 is ideally suited for use in commercial building HVAC systems, including hot water and chilled water valve control, steam valve modulation, and other pneumatically controlled hydronic applications. Its spring return action makes it a trusted choice where fail-safe valve closure or opening is required upon loss of control signal.
Why Choose the Schneider Electric MK-6811?
As part of the trusted Barber Colman legacy now carried forward by Schneider Electric, the MK-6811 combines proven pneumatic actuator technology with robust construction. The NEMA 1 enclosure protects internal components in standard indoor mechanical room environments, while the 1/8″ NPT air connection simplifies integration into existing pneumatic control systems.
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