III. Structural Features

• Triple Eccentric Design: Three offsets (stem axis, disc center, seat cone) eliminate contact between disc and seat during 90% of opening/closing travel, reducing wear and lowering actuation torque—critical for extending seal life in frequent-use systems.
• Multi-Layer Hard Sealing: 3~5 layers of metal (304 stainless steel + Stellite) form a labyrinth seal, with each layer acting as a secondary barrier. Elastic metal gaskets between layers compensate for thermal expansion, maintaining tightness from -40℃ to 400℃.
• Manual Turbine Drive: Gear-driven mechanism amplifies force, enabling one-person operation of DN600 valves. The turbine housing (cast iron) is dust-proof and waterproof (IP65), suitable for outdoor or dusty industrial environments.
• Anti-Blowout Stem: Integral stem with a backseat design prevents ejection under high pressure, while a stainless steel pin locks the stem to the disc, enhancing operational safety.
• Streamlined Disc: Aerodynamic profile reduces pressure drop by 15% compared to standard butterfly valves, improving energy efficiency in high-flow systems.

IV. Manufacturing Processes

• Material Inspection: Castings undergo ultrasonic testing to eliminate internal defects; 304 stainless steel and Stellite alloys are verified via spectral analysis (Cr ≥18% for 304).
• Precision Machining: CNC grinders shape the triple eccentric disc to ±0.02mm tolerance, ensuring uniform clearance with the seat. Multi-layer seals are laser-cut and pressed to ensure layer alignment.
• Seal Assembly: Layers are bonded with high-temperature adhesive (resistant to 450℃) and riveted to the seat, then lapped to a mirror finish (Ra ≤0.8μm) for tight contact with the disc.
• Testing: Each valve undergoes:
  • Hydrostatic test (1.5×PN16) for 30 minutes to check body integrity.
  • Gas tightness test (0.6MPa nitrogen) with leakage ≤0.1×10⁻⁶ mL/s.
  • 1000-cycle operation test to verify turbine smoothness and seal stability.