Siemens Building Technology 331-4311 Actuator

The Siemens Building Technology 331-4311 Actuator is a No. 3 Pneumatic Damper Actuator engineered for the gradual or positive control of HVAC dampers and air valves. This robust, metal-fabricated unit operates within a 3 to 7 psi spring range and features a 2-3/8 inch stroke, making it a reliable choice for mixing box dampers and unit ventilators. As the direct replacement for MK-693-85, it integrates seamlessly into existing pneumatic systems using an extended shaft mounting configuration. The design utilizes an ozone-resistant rolling diaphragm and includes an integral pivot and pivot post for high-performance modulating or two-position actuation. For field connections, the assembly provides a 1/8-inch NPT internal thread with a straight dual barb fitting, compatible with 1/4-inch OD tubing. This pneumatic damper actuator ensures long-term durability in demanding industrial environments, maintaining precise control in air handling units and terminal boxes.

• Direct Compatibility: Functionally replaces the Siemens MK-693-85, reducing downtime during maintenance or retrofits.
• Rugged Construction: Features an all-metal body and an ozone-resistant rolling rubber diaphragm designed for industrial HVAC duty cycles.
• Precise Control: The 3-7 psi nominal spring range allows for accurate sequencing and modulation within pneumatic control loops.
• Versatile Installation: Supports extended shaft mounting with an included clevis and pivot post for flexible mechanical linkage.

• Can I use this for modulating or two-position control? Yes, the 331-4311 is specifically designed for both modulating and two-position actuation of dampers.
• Does this include the necessary hardware for mounting? This model is equipped for extended shaft mounting and includes the integral pivot, pivot post, and clevis.
• What is the maximum air pressure for this actuator? The No. 3 Pneumatic Actuator is lead-rated for a maximum air pressure of 30 psig.

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