Description
Schneider Electric (Barber Colman) MK-8821 Pneumatic Valve Actuator Overview
The Schneider Electric (Barber Colman) MK-8821 is a proportional control pneumatic valve actuator engineered for reliable, precise valve positioning in commercial and industrial HVAC systems. Featuring spring return operation and linear movement, this actuator delivers consistent, fail-safe performance in building automation and pneumatic control applications.
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-acting valve stem control
- NEMA 1 enclosure for indoor installation in clean environments
- 8–13 PSI pneumatic operating range for standard pneumatic control systems
- 100 square inch diaphragm area for high actuating force output
- 1/8″ NPT air connection for easy integration with pneumatic tubing
- 1″ nominal stroke for precise valve travel
Specifications
- Model: MK-8821
- Brand: Schneider Electric (Barber Colman)
- Control Type: Proportional
- Actuator Type: Pneumatic
- Operation: Spring Return
- Movement: Linear
- Enclosure Rating: NEMA 1
- Pneumatic Input Range: 8–13 PSI
- Diaphragm Area: 100 square inches
- Air Connection: 1/8″ NPT
- Nominal Stroke: 1 inch
Applications
The MK-8821 is ideal for use in commercial building HVAC systems where pneumatic control of hot water, chilled water, or steam valves is required. It is well-suited for air handling units, fan coil units, and hydronic systems that rely on pneumatic building automation infrastructure.
Why Choose the Schneider Electric MK-8821?
As a trusted Barber Colman legacy product now carried under the Schneider Electric brand, the MK-8821 offers proven field reliability, straightforward installation, and compatibility with standard pneumatic control systems. The spring return mechanism provides added safety by returning the valve to its fail-safe position whenever air supply is interrupted.
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