Schneider Electric (Barber Colman) MK-3101 Pneumatic Damper Actuator

For high-performance environmental control, the Schneider Electric MK-3101 (formerly Barber Colman MK-3101) is the industry-standard pneumatic damper actuator for proportional or two-position control. This proportional pneumatic actuator features an 8 in² effective diaphragm area and is engineered specifically for HVAC damper control in mixing boxes, air valves, and terminal units. With a 3 to 8 psi spring range, it provides reliable spring-return fail-safe operation, retracting the shaft upon loss of pilot air pressure. The MK-3101 is housed in a rugged die-cast aluminum body, making it a staple for contractors maintaining legacy pneumatic control systems. Technical specifications include a 2" to 4" adjustable stroke to accommodate various damper sizes and a maximum operating pressure of 30 psig. The unit utilizes standard 1/8" FNPT air connections and a long-lasting rolling neoprene diaphragm for consistent linear force throughout the stroke, ensuring precise airflow modulation in diverse commercial HVAC maintenance applications.

• Precise Control: Features a 3-8 psig nominal operating range for accurate proportional air valve positioning.
• Field Flexibility: The adjustable stroke damper actuator design allows for 2-inch to 4-inch travel to meet specific site requirements.
• Fail-Safe Reliability: Heavy-duty internal spring ensures a positive retract position during air pressure failure.
• Rugged Construction: Built with a cast aluminum housing and a beaded, molded neoprene diaphragm for long-term service life.
• Standardized Fit: 1/8" FNPT air connection ensures seamless integration into existing pneumatic HVAC systems.

Is the MK-3101 compatible with positive positioners?
Yes, this unit is commonly paired with the AK-42309-500 positive positioner to overcome friction and ensure accurate positioning regardless of load.

What is the maximum air pressure this actuator can handle?
The Schneider Electric MK-3101 is rated for a maximum air pressure of 30 psig.

Can this actuator be mounted in any orientation?
Yes, the MK-3101 pneumatic actuator is designed for mounting in any position, facilitating easier installation in tight plenum spaces or VAV boxes.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.