Siemens Building Technology 331-2857 Pneumatic Damper Actuator #6 3-8 PSI with Clevis

The Siemens 331-2857 is a Number 6 Pneumatic Damper Actuator designed for heavy-duty HVAC applications. This rugged, metal-fabricated actuator provides gradual or positive control of large dampers, centrifugal refrigeration inlet vanes, and other systems requiring substantial diaphragm area and stroke length.

Key Features:

• 4-inch stroke length for extended range of motion
• Spring range of 3 to 8 PSI for low-pressure applications
• Pivot mounting configuration with clevis for frame mounting
• Replaceable rolling diaphragm for extended service life
• 1/8-inch NPT female air connection
• Heavy-duty rolling diaphragm design with large effective area

This spring-return actuator is ideal for controlling outdoor air dampers, return air dampers, exhaust dampers, face and bypass dampers, fan discharge dampers, and static pressure control dampers. The Number 6 size is specifically engineered for large damper applications where substantial force and stroke are required.