Eccentric Butterfly Valve: Structure and Applications

The eccentric butterfly valve is a quarter-turn rotational motion valve, widely used in industries for flow regulation and isolation due to its compact size, low weight, and cost-effectiveness. Its structural design features an off-center disc (eccentric disc) mounted on the valve stem, which is positioned away from the valve body's centerline. This eccentricity eliminates rubbing between the disc and seat during operation, reducing wear and extending service life.

Key Components:Body: Typically made of cast iron, carbon steel, or stainless steel, ensuring durability under high-pressure conditions.Disc: Shaped like a disc or wing, rotated by the stem to control flow. Eccentricity enables zero-leakage sealing.Stem: Connected to the disc, transmitting torque from the actuator to the disc.Seat: Soft or metal seat (e.g., PTFE or stainless steel) provides tight sealing; eccentricity enhances seat-disc contact.Actuator: Manual lever, gear, or electric/pneumatic actuator for automated control.Applications: Ideal for large-diameter pipelines in water treatment, HVAC, petrochemicals, and power plants. The double or triple offset designs suit high-temperature/pressure environments. Eccentric valves minimize turbulence and offer bubble-tight shutoff, making them preferred for precise flow control.