The snap-action contacts and hermetically sealed electrical components provide reliable switching and protection against environmental contaminants

It is factory-calibrated to 25 PSI Open and 80 PSI Close to ensure consistent protection without the risk of field tampering

and corrosive fertilizers or cleaners

Turbo mode

which is critical for opening the valve during high-vacuum evacuation or in the event of a power failure to prevent system downtime

Siemens Building Technology 331-4510 Actuator R-448A The snap-action contacts and hermeticallyThe Siemens 331 4510 is a heavy duty No. 3 pneumatic damper actuator designed for reliable, modular, or two position control of HVAC dampers and air valves. Built with a rugged, metal fabricated housing, this pneumatic actuator features an ozone resistant rolling rubber diaphragm that ensures consistent performance in demanding mechanical environments. It operates with a 5 to 10 psi nominal spring range and delivers a precise 2 3 8 inch stroke for