Siemens Building Technology 331-2856 Pneumatic Damper Actuator Stroke - 4-Inch

The Siemens Building Technology 331-2856 is a #6 pneumatic damper actuator designed for commercial HVAC applications requiring reliable zone control. This spring-return actuator features a 4-inch stroke length and operates on 8-13 PSI input pressure, making it ideal for modulating dampers in air handling systems.

Key Features:

• 4-inch linear stroke for positive damper positioning
• 8-13 PSI operating pressure range
• #6 size actuator for medium to large damper applications
• Spring-return (pressure-to-move) operation for fail-safe performance
• Durable construction for long service life in commercial environments
• Direct mounting to standard damper shafts

This pneumatic actuator provides proportional control of HVAC dampers in response to pneumatic control signals from building automation systems. The spring-return design ensures the damper returns to a predetermined fail-safe position during power loss or air supply interruption, making it suitable for life safety and critical ventilation applications.