Description
The Schneider Electric (Barber Colman) MK-6821 is a proportional control, spring-return pneumatic valve actuator engineered for reliable linear valve actuation in commercial HVAC and building automation systems. Housed in a rugged NEMA 1 enclosure, this actuator delivers consistent, fail-safe performance in a wide range of pneumatic control applications.
Key Features
- Proportional control for precise, modulating valve positioning
- Spring-return design provides fail-safe operation upon loss of air signal
- Linear movement for direct-coupled valve actuation
- NEMA 1 enclosure for indoor commercial installations
- Operating pressure range: 8–13 PSI pneumatic signal
- Large 50 square inch diaphragm area for high actuating force
- 1/8″ NPT air connection for easy pneumatic line hookup
- 1″ nominal stroke for precise valve travel
Application
The MK-6821 is ideal for use with pneumatically actuated control valves in hydronic heating and cooling systems, air handling units, and other HVAC equipment requiring proportional modulation. The spring-return mechanism ensures the valve returns to a predetermined safe position whenever the pneumatic signal is interrupted, making it well-suited for critical control loops.
Specifications
- Brand: Schneider Electric (Barber Colman)
- Model: MK-6821
- Control Type: Proportional
- Actuator Type: Pneumatic, Spring Return
- Movement: Linear
- Enclosure Rating: NEMA 1
- Pneumatic Signal Range: 8–13 PSI
- Diaphragm Area: 50 square inches
- Air Connection: 1/8″ NPT
- Nominal Stroke: 1 inch
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