Description
The Schneider Electric (Barber Colman) MK-4621 is a proportional control pneumatic valve actuator engineered for reliable, precise modulation in commercial HVAC and building automation systems. Featuring a spring return mechanism and linear movement design, this actuator delivers consistent, fail-safe positioning whenever air pressure is interrupted — making it an ideal choice for critical valve control applications.
Key Features
- Proportional control for accurate, stepless valve positioning
- Spring return operation ensures fail-safe valve positioning on loss of air signal
- Linear movement design for direct compatibility with globe and other linear-stroke valves
- NEMA 1 enclosure rating suitable for indoor, general-purpose installations
- 10–13 PSI pneumatic operating range for standard building automation pneumatic systems
- 11 square inch diaphragm area provides reliable actuating force
- 1/8″ NPT air connection for easy integration with standard pneumatic tubing and fittings
- 1/2″ nominal stroke for precise valve travel control
Specifications
- Model: MK-4621
- Brand: Schneider Electric (Barber Colman)
- Control Type: Proportional
- Return Type: Spring Return
- Movement: Linear
- Enclosure: NEMA 1
- Operating Pressure Range: 10–13 PSI
- Diaphragm Area: 11 Square Inches
- Air Connection: 1/8″ NPT
- Nominal Stroke: 1/2″
Applications
The MK-4621 is well-suited for use in commercial and institutional HVAC systems where pneumatic control of heating and cooling valves is required. It integrates seamlessly into existing pneumatic building automation infrastructure, providing dependable proportional modulation for air handling units, fan coil units, and hydronic valve assemblies.
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