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A circular disk mounted on an internal shaft pivots to control airflow from fully open ( 100% flow), to fully closed (shutting off all air), to anything in between. Once the butterfly valve is set, a locking quadrant holds it in place.
Known as Butterfly Damper, Butterfly Valve, or Volume Damper
Products come with raw ends. Diameters are +/- 1/8 inch.
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