Schneider Electric (Barber Colman) N800-9426 Diaphragm

The Schneider Electric (Barber Colman) N800-9426 Diaphragm is a critical replacement component for maintaining pneumatic system integrity. This heavy-duty piston damper actuator diaphragm is specifically engineered for use with Schneider Electric 2466 series and Barber Colman M556 series actuators. As a direct equivalent to the Barber Colman 21-104, it ensures a seamless fit and restores the necessary pressure sensitivity for accurate pneumatic control systems. This 24.8 sq. in. diaphragm is vital for managing air control dampers, centrifugal refrigeration compressor inlet vanes, and butterfly valves in commercial HVAC automation setups. Designed to handle standard 3-15 psig control signals, it provides the resilience needed for proportional or two-position applications without losing elasticity over time. When your M556 pneumatic actuator fails to hold pressure or shows sluggish response, swapping the worn internal seal with this N800-9426 replacement part is the primary step to restore factory-spec modulation and torque output across the full stroke.

• Universal Compatibility: Fully interchangeable with the 21-104 diaphragm, ensuring full support for M556 piston actuators.
• Optimal Pressure Response: Maintains high sensitivity for precise pneumatic damper control and airflow management.
• Industrial-Grade Resilience: Constructed to withstand the continuous cycling of HVACR pneumatic systems.
• System Restoration: Resolves common air leaks and positioning errors in aging Barber Colman actuator assemblies.

Is the N800-9426 a direct replacement for the 21-104?
Yes, the N800-9426 is the exact technical equivalent to the legacy Barber Colman 21-104 part number, meeting all original equipment specifications for the M556 series.

What are the signs that my actuator diaphragm needs replacement?
Technicians should look for air hissing from the actuator housing, the failure of the damper to reach its full stroke, or the inability of the pneumatic controller to maintain a set position under load.

Does this diaphragm work with the M556-14 model?
Yes, this diaphragm is designed for the M556 series, including those equipped with a positive positioner and spring ranges such as 8 to 13 psi.

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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.