Schneider Electric MK-6601 Pneumatic Valve Actuator 50 Sq In 3-8 PSI VB-7000

The Schneider Electric (Barber Colman) MK-6601 is a proportional pneumatic valve actuator designed for precise control of hot water and chilled water valves in commercial and industrial HVAC systems. This spring-return actuator features a 50 square inch (323 cm²) effective diaphragm area and operates within a 3-8 PSI pressure range, making it ideal for use with VB-7000 series valves ranging from 1-1/2 inch to 2 inch sizes.

Key Features:

• 50 sq in effective diaphragm area for powerful, responsive control
• Proportional pneumatic control with 3-8 PSI spring range
• Spring return mechanism for fail-safe operation
• Linear movement with 1/2 inch nominal stroke
• Rugged die-cast aluminum housing construction
• Replaceable beaded molded neoprene diaphragm
• NEMA 1 enclosure rating for environmental protection
• 1/8 inch NPT air connection
• Start point adjustable ±2 PSI for fine-tuning

This actuator is specifically designed for proportional control applications in air handling units, fan coil units, and variable air volume systems. The rolling diaphragm design ensures smooth, reliable operation and extended service life. Compatible with VB-7xxx, VB-8xxx, and VB-9xxx series globe valves, the MK-6601 provides energy-efficient performance while maintaining precise temperature control in building automation systems.