Description
The Schneider Electric (Barber Colman) MK-4601 is a proportional control, spring return pneumatic valve actuator engineered for precise linear valve positioning in commercial HVAC and building automation systems. Featuring an 11 square inch diaphragm area and a 3–6 PSI pneumatic control range, this actuator delivers reliable, repeatable modulating control of two-way and three-way valves in hydronic heating, cooling, and process applications.
Key Features
- Proportional control action for accurate, modulating valve positioning
- Spring return operation ensures fail-safe valve positioning on loss of air signal
- Linear movement design for direct-coupled valve stem actuation
- NEMA 1 enclosure rating for standard indoor installations
- 3–6 PSI pneumatic input signal range for compatibility with standard pneumatic controllers
- 11 square inch diaphragm area provides ample actuating force
- 1/8″ NPT air connection for easy pneumatic line hookup
- 1/2″ nominal stroke for precise valve travel control
Specifications
- Brand: Schneider Electric (Barber Colman)
- Model / SKU: MK-4601
- Actuator Type: Pneumatic, Proportional Control
- Action: Spring Return
- Movement: Linear
- Enclosure Rating: NEMA 1
- Pneumatic Signal Range: 3–6 PSI
- Diaphragm Area: 11 square inches
- Air Connection: 1/8″ NPT
- Nominal Stroke: 1/2″
Application
The MK-4601 is ideal for use in commercial building HVAC systems where pneumatic control of hydronic valves is required. Its spring return mechanism provides a dependable fail-safe position, making it well-suited for critical heating and cooling valve control in air handling units, fan coil units, and terminal equipment. The NEMA 1 enclosure makes it appropriate for clean, dry indoor mechanical room environments.
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