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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

Design standards: API 609, MSS SP-67, MSS SP-68, BS 5155

Structural length: API 609, ASME B16.10, BS 5155, EN1092

Flange standards: ASME B16.5, ASME B16.47

Butt welding end standard: ASME B16.25

Inspection standard: API 598

Size: 2" to 128"(DN50 to DN3200)

Nominal pressure: ASME CLASS 150-600 (PN16 - PN100)

Valve body materials: carbon steel, stainless steel, alloy steel, copper, etc

Valve plate materials: carbon steel, stainless steel, alloy steel, copper, etc

Valve stem material: 410SS, 304SS&17-4PH, etc

Valve seat material: 316 SS hard seal, PTFE, asbestos board

Valve body type: wafer type, lug or double flange

Operation: Handle, gear, electric, pneumatic, hydraulic