Schneider Electric (Barber Colman) MK-6601 Proportional Control

The Schneider Electric MK-6601 is a rugged 50-square-inch pneumatic valve actuator designed for proportional control of valves requiring linear movement. Featuring a 3-8 psi spring range and a 1/2-inch nominal stroke, this spring return actuator ensures consistent positioning and reliable fail-safe operation in HVAC systems. The unit is housed in a durable NEMA 1 enclosure, protecting internal components from environmental debris, while the 1/8" NPT air connection facilitates straightforward integration into existing pneumatic lines. Engineered for high-force applications, the MK-6601 provides the necessary torque for precise modulation in steam and water-based climate control applications. For contractors performing field replacements, ensure the 50 sq. in. effective diaphragm area matches the mechanical requirements of the valve body to maintain factory-spec pressure drops and flow coefficients.

Key Benefits

• Linear Proportional Control: Delivers precise modulation for consistent valve positioning throughout the 3-8 psi signal range.
• Internal Spring Return: Provides reliable mechanical fail-safe positioning upon loss of control air.
• Heavy-Duty Diaphragm: The 50-square-inch effective area generates high seating force for high-pressure applications.
• NEMA 1 Protection: Rugged metal housing ensures longevity in mechanical rooms and protected environments.
• Standard Connectivity: Features a 1/8" NPT air inlet for compatibility with standard pneumatic tubing and fittings.

Common Questions

What is the maximum air pressure for the MK-6601?
This actuator is typically rated for a maximum static pressure of 30 psi, though it operates within a 3-8 psi control signal range.

Can the MK-6601 be mounted in any orientation?
While versatile, it is standard practice to mount the actuator upright to prevent premature wear on the stem seals and linkage.

Does this unit include the linkage for valve mounting?
The MK-6601 is the actuator assembly; specific valve linkages may be required depending on the Schneider Electric or Barber Colman valve body being serviced.

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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.