Siemens 332-4811 Pneumatic Damper Actuator with Positioner No.3 2-3/8" Stroke

The Siemens 332-4811 is a Number 3 pneumatic damper actuator with integral positioning relay, designed for precise modulating or two-position control of HVAC dampers and air valves. This rugged, metal-fabricated actuator features an integral pivot and pivot post for secure mounting and reliable operation in commercial building automation systems.

Key Features:

• Nominal spring range of 8-13 PSI for consistent operation
• 2-3/8" stroke length provides adequate travel for damper control
• Integrated positioning relay for accurate modulating control
• Ozone-resistant rolling rubber diaphragm for long service life
• Extended shaft mounting with integral pivot and pivot post
• 1/8" NPT female air connection with straight dual barb fitting for 1/4" OD tubing
• Metal construction ensures durability in demanding HVAC environments

This actuator is commonly used in mixing box dampers, zone control applications, and air valve actuation where precise positioning feedback is required. The positioning relay provides accurate modulating control by maintaining the actuator shaft position in direct proportion to the pneumatic control signal.