Description
The Schneider Electric (Barber Colman) MK-6621 is a heavy-duty proportional control pneumatic valve actuator engineered for reliable, precise valve positioning in commercial and industrial HVAC systems. Featuring a spring return mechanism and linear movement design, this actuator provides dependable fail-safe operation in the event of air supply loss — making it an ideal choice for critical building automation and hydronic 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 valve stem actuation
- NEMA 1 enclosure for indoor commercial installations
- 8–13 PSI pneumatic operating range
- 50 square inch diaphragm area for reliable actuation force
- 1/8″ NPT air connection for easy pneumatic system integration
- 1/2″ nominal stroke
Specifications
- Model: MK-6621
- Brand: Schneider Electric (Barber Colman)
- Control Type: Proportional
- Actuator Type: Pneumatic Valve Actuator
- Return Type: 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: 1/2″
Applications
- Commercial HVAC hydronic valve control
- Building automation and pneumatic control systems
- Chilled water and hot water valve actuation
- Air handling unit coil valve control
- Pneumatic DDC and direct-acting control loops
The MK-6621 is a trusted replacement and new-installation actuator for facilities using pneumatic building controls. Its robust 50 square inch diaphragm delivers consistent actuation force across the 8–13 PSI control range, while the spring return feature ensures valves return to a safe position during system shutdowns or air supply failures. The NEMA 1 enclosure suits standard indoor mechanical room and air handler installations.
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