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Ductile Iron Body Gear Butterfly Valves Chinese Direct Sales. Wafer Pattern Design: Enables quick and easy installation for various piping systems. Replaceable EPDM Seat: Wider design suits different flange types for enhanced durability. Streamlined Disc: SS304 material reduces water head loss for improved flow efficiency. Bi-directional Shut-off: Ensures reliable sealing and flow control in both directions. Eccentric Pin Stem: Protects stem structure integrity and ensures strong mechanical strength. Wide Size Range: Available in sizes from DN50 to DN600 (2" to 24"). Gearbox Operation: Suitable for DN50 to DN600 for smooth manual control. ISO Top Flange: Standard design allows easy integration with actuators.