Siemens Building Technology 331-3012 321894-709 this valve is designed to

this valve is designed to withstand the rigorous demands of mechanical rooms

How many wires are included in this assembly

its totally enclosed rating is an upgrade

this part is the heartbeat of your system’s ignition sequence

Siemens Building Technology 331-3012 321894-709 this valve is designed toThe Siemens 331 3012 is a heavy duty #6 pneumatic damper actuator designed for high torque applications in commercial HVAC systems. This spring return actuator features a 4 inch stroke and a nominal 3 8 psi spring range, making it an ideal choice for the gradual or positive control of large dampers, centrifugal refrigeration inlet vanes, and fire smoke dampers. Built with a rugged, metal fabricated housing and a 17. 9 sq. in. effective diaphragm area,