Siemens Building Technology 331-2968 Actuator

As a veteran HVACR technician, you know the reliability of the Siemens 331-2968 No. 4 pneumatic actuator. This pneumatic damper actuator is built with a rugged, all-metal body designed for the positive or gradual actuation of HVAC dampers in mixing boxes, terminal units, and unit ventilators. Featuring a 4 inch stroke and an effective diaphragm area of 17.9 sq. in., this unit provides the necessary thrust for precise air volume control. The 8-13 psi nominal spring range allows for seamless sequencing with other control devices in a pneumatic system. The integrated pivot mount, complete with a clevis and clevis pin, simplifies frame mounting for both new installations and retrofits. Maintenance is straightforward thanks to the replaceable, ozone-resistant EPDM rubber rolling diaphragm. For professionals handling pneumatic control systems, the 1/8 inch NPT female air connection and included dual barb elbow fitting ensure a secure leak-free interface with 1/4 inch OD tubing. This actuator is the industry standard for high-performance HVAC pneumatic components.

• Consistent Performance: The 8-13 psi spring range ensures accurate linear motion for volume control dampers.
• Durable Construction: Heavy-duty metal fabrication stands up to the rigors of mechanical rooms and industrial air handling environments.
• Flexible Mounting: Integral pivot mount with clevis pin facilitates easy installation on extended shafts or standard frames.
• Serviceable Design: The EPDM rolling diaphragm is fully replaceable, extending the operational life of the actuator assembly.

Common Questions

What is the maximum air pressure for the Siemens 331-2968?
The maximum recommended supply air pressure for this No. 4 actuator is 30 psi, ensuring compatibility with standard pneumatic control loops.

Can this actuator be used for fire or smoke dampers?
Yes, the 331-2968 is UL component recognized and suitable for use on fire/smoke dampers requiring gradual or positive actuation.

Does it include a positioning relay?
This specific model features an integral pilot/clevis but does not include a factory-installed positioning relay, though one can be added if your application requires precise feedback.

This item is not eligible for free shipping.

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.