III. Structural Features

• Electric Actuation System: Equipped with a modular electric actuator (integral with valve) for automated control, supporting remote operation via 4-20mA signals or on-site buttons. Manual override (handwheel) is included for emergency operation, ensuring functionality during power outages.
• Floating Ball Design: The ball “floats” between seats, with upstream pressure pushing it against the downstream seat to form a self-tightening seal. This structure ensures tight shut-off even at low pressures, critical for preventing leaks in oil or hazardous media.
• Metal-to-Metal Sealing: Precision-machined metal seats and ball surfaces (Ra ≤0.8μm) create a bubble-tight seal (ANSI FCI 70-2 Class V). Unlike soft seals, metal seals resist wear from solid particles and degradation at high temps (≥250℃), extending service life.
• Stainless Steel Construction: 304/316 stainless steel resists rust, chemical erosion, and oxidation, making it suitable for humid, coastal, or mildly corrosive environments (e.g., industrial wastewater, oil with impurities).
• Flange Connection: Standardized flange dimensions ensure compatibility with pipeline systems, providing a robust joint that withstands thermal expansion and pressure fluctuations—ideal for permanent installations in fixed industrial lines.

IV. Manufacturing Processes

• Material Preparation: Stainless steel (304/316) raw materials undergo spectral analysis to verify chemical composition (316: 16-18% Cr, 10-14% Ni, 2-3% Mo) and ultrasonic testing to eliminate internal defects (cracks, inclusions).
• Precision Machining:
  • Ball & Seal Surfaces: CNC grinders achieve ball roundness ≤0.01mm and surface finish Ra ≤0.8μm; seats are lapped to match ball contours, ensuring uniform contact for tight sealing across temperature cycles.
  • Body & Flange: CNC lathes machine flange sealing faces to flatness ≤0.05mm, with bolt holes drilled to ±0.1mm tolerance for alignment with pipeline flanges.
• Actuator Integration: Electric actuators are assembled with torque limiters and position sensors, then mounted to the valve via a precision adapter plate. Linkage components (stem, coupling) are calibrated to ensure 90° rotation accuracy (±1°).
• Testing & Calibration:
  • Valve Performance: Each valve undergoes hydrostatic shell test (1.5×rated pressure) and gas tightness test (0.6MPa nitrogen) with leakage ≤0.1×10⁻⁶ mL/s.
  • Actuator Function: Actuators are tested for 1000+ open/close cycles to verify torque output, response time, and position accuracy; IP67 waterproof testing ensures resistance to dust and water ingress.