Description
Schneider Electric (Barber Colman) MK-8921 Pneumatic Valve Actuator Overview
The Schneider Electric (Barber Colman) MK-8921 is a heavy-duty proportional control pneumatic valve actuator engineered for reliable, precise valve positioning in commercial and industrial HVAC systems. With a generous 100 square inch diaphragm area and a spring-return mechanism, this actuator delivers consistent, fail-safe operation — automatically returning to its safe position upon loss of air pressure. Its linear movement design makes it ideal for direct-coupled globe valve applications where accurate proportional control is essential.
Key Features
- Proportional control operation for precise, modulating valve positioning
- Spring-return design ensures fail-safe positioning on loss of air signal
- Linear movement output for direct compatibility with globe-style control valves
- 100 square inch diaphragm area for high thrust force output
- Operating pneumatic signal range: 8–13 PSI
- 2″ nominal stroke for broad valve compatibility
- 1/8″ NPT air connection for easy pneumatic line hookup
- NEMA 1 enclosure rating suitable for indoor, general-purpose installations
Specifications
- SKU / Model: MK-8921
- Brand: Schneider Electric (Barber Colman)
- Actuator Type: Pneumatic, Proportional Control
- Diaphragm Area: 100 square inches
- Control Signal Range: 8–13 PSI
- Stroke: 2″ Nominal
- Movement Type: Linear
- Return Type: Spring Return
- Air Connection: 1/8″ NPT
- Enclosure Rating: NEMA 1
Application
The MK-8921 is designed for use in building automation and pneumatic control systems where modulating valve control is required. It is well-suited for hydronic heating and cooling systems, air handling units, and other commercial HVAC applications that rely on pneumatic control signals for precise flow regulation. The spring-return feature provides an added layer of safety, ensuring valves return to a predetermined position during air supply interruptions.
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