Siemens 331-4313 Damper Actuator, Pneumatic, Number 3, 2 3/8" Stroke, 3 to 7 psi, Fixed Bracket Mounting. Siemens Nos. 3, 4 and 6 Pneumatic Damper Actuators are heavy-duty, spring return actuators designed to drive large dampers and other applications requiring large diaphragm area and long stroke.
