Structural Features：
1. Concentric Design: The butterfly disc rotates around the center of the valve body, ensuring easy operation, bidirectional sealing, and low operating torque.
2. Wafer-Style Connection: Designed to be clamped between two pipe flanges, saving space and reducing costs.
3. Soft-Sealing Design: A rubber seat is press-fitted into the valve body, providing reliable sealing and zero leakage at low pressures.
4. Ductile Iron Body (QT450-10 / GGG40): Offers superior strength, toughness, and impact resistance compared to standard gray cast iron; highly resistant to brittle fracture, making it suitable for outdoor use or environments subject to vibration.
5. Epoxy Powder-Coated Surface: Provides rust and corrosion protection; food-grade (potable water) coating options are available.
6. Stainless Steel Stem: Rust-resistant; features a packing-free design, minimizing the risk of leakage and simplifying maintenance.
Standard Material Specifications：
- Valve Body: Ductile Iron (QT450-10)
- Butterfly Disc: Ductile Iron / Stainless Steel 304 or 316 (optional)
- Valve Seat: EPDM (for water/wastewater), NBR (for oils), or FKM/Viton (for high-temperature and oil-resistant applications)
- Valve Stem: Stainless Steel (SS304 / SS416)
- Actuation: Lever, worm gear, pneumatic actuator, or electric actuator
