05/08/2026
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A butterfly valve is a quick-acting, quarter-turn rotary device used to start, stop, or regulate fluid flow. It features a flat circular disc positioned in the center of the pipe. Turning the handle 90 degrees moves the disc parallel or perpendicular to the flow.
Main PartsBody:
Fits between pipe flanges.
Disc: Pivots on a shaft to block or open paths.
Stem: Connects the external handle to the internal disc.
Seat: Rubber or metal liner that seals the closed disc.Actuator: Lever, gear, or motor used to turn the stem.
Types of Design
Wafer type: Sits pinched between two pipe flanges using long bolts.
Lug type: Features threaded holes matching bolt patterns for secure mounting.
Concentric: Standard rubber-seated design with a centered disc.
Eccentric (Double/Triple Offset): Higher performance metal seals for extreme pressure.
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