Description
The Schneider Electric (Barber Colman) MK-6611 is a heavy-duty proportional control pneumatic valve actuator engineered for precise, reliable valve positioning in commercial and industrial HVAC systems. Featuring a spring return mechanism, this actuator ensures fail-safe operation — automatically returning to its default position upon loss of air pressure, making it ideal for critical building automation and hydronic control applications.
Key Features
- Proportional control action for accurate, modulating valve positioning
- Spring return design provides fail-safe operation on loss of air signal
- Linear movement for direct, smooth stroke actuation
- NEMA 1 enclosure for indoor installation in clean, dry environments
- 50 square inch diaphragm area for robust actuating force
- 5–10 PSI pneumatic operating range
- 1/8″ NPT air connection for standard pneumatic tubing compatibility
- 1/2″ nominal stroke for precise valve travel
Specifications
- Brand: Schneider Electric (Barber Colman)
- Model / SKU: MK-6611
- Control Type: Proportional
- Actuator Type: Pneumatic Valve Actuator
- Return Type: Spring Return
- Movement Type: Linear
- Diaphragm Area: 50 Square Inches
- Operating Pressure Range: 5–10 PSI
- Air Connection: 1/8″ NPT
- Nominal Stroke: 1/2″
- Enclosure Rating: NEMA 1
Applications
- Commercial HVAC hydronic valve control
- Building automation and pneumatic control systems
- Air handling unit hot and chilled water coil valves
- Pneumatic control loops requiring proportional modulation
- Fail-safe valve positioning in critical mechanical systems
The MK-6611 is a trusted solution for mechanical contractors and building automation professionals who require dependable proportional control with the proven reliability of the Schneider Electric (Barber Colman) product line. Its compact NEMA 1 enclosure, standard 1/8″ NPT air connection, and 5–10 PSI operating range make installation and integration into existing pneumatic systems straightforward and efficient.
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