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The first eccentricity: The rotation center of the valve stem deviates from the centerline of the valve seat, ensuring a tight seal between the valve seat and the butterfly plate

The second eccentricity: The rotation center of the valve stem deviates from the center of the valve body. When the valve is opened, the butterfly plate can quickly separate from the sealing surface

The third eccentricity: The center of the sealing ring cone deviates from the valve centerline, completely eliminating the friction between the butterfly plate and the valve seat

The bracket is designed in accordance with ISO5211, facilitating the installation of gearboxes, pneumatic or electric actuating machinery

2. Upper anti-valve stem blowing out design

3. Low leakage packing (optional), advanced metal-interwoven graphite packing (for the bottom and top layers) and low leakage packing (for the middle), ensuring a maximum leakage of 20ppm

4. The extended bearing design adopts an extended precision bearing to reduce the friction of the valve stem and ensure a low operating torque. Graphite rings are used to prevent contaminants from entering the bearing

5. The multi-layer sealing pair design ensures zero leakage through the elastic deformation of the sealing rings. The sealing rings are truly interchangeable, facilitating maintenance

6. The valve seat is surfacing with hard alloy to harden the valve seat as a whole, which extends the service life of the valve and reduces the frequency of maintenance

7. Bottom valve stem anti-blowout design

Structure: Lug type, wafer type, double flange type, butt welding type