Siemens 331-3012 DAMPER ACTUATOR, PNEU NO 6, 4" STROKE, 3-8PSI, INTEG PIVOT, EXT SHAFTSiemens 331 3012 Damper Actuator, Pneu No 6, 4" Stroke, 3 8psi, Integ Pivot, Ext Shaft This 331 Number 6 Pneumatic Damper Actuator with integral pivot and pivot post is a rugged, metal fabricated device that provides gradual or positive actuation of HVAC and fire smoke dampers. This actuator has a nominal spring range of 3 to 8 psi, is mounted on a plate which allows extended shaft mounting and has a replaceable diaphragm. This actuator has a 1 8" NPT
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