III. Features Description

• Trunnion-Mounted Ball Structure: The ball is fixed by upper and lower trunnions, eliminating displacement under 600LB pressure. This design reduces seat wear compared to floating ball valves, ensuring stable sealing in high-pressure, frequent-operation systems (e.g., oil transfer lines).
• Reduced Bore Flexibility: Options like 2″to 1.5″ 缩径 balance flow control and pressure drop, ideal for systems requiring flow restriction (e.g., metering lines) without compromising structural integrity.
• F316L Corrosion Resistance: Forged F316L minimizes carbon content (≤0.03%) to avoid intergranular corrosion, outperforming F304 in chloride-rich environments (e.g., offshore platforms). NACE compliance ensures resistance to sulfide stress cracking in sour gas applications.
• PEEK Seal Performance: PEEK seats withstand high temperatures (260℃) and resist chemicals like acids and solvents, making them suitable for pharmaceutical and petrochemical processes where PTFE might degrade.
• Safety-Enhanced Design:
  • Anti-blowout stem: A shoulder mechanism prevents stem ejection, critical for high-pressure systems handling flammable media.
  • Anti-static device: Metal springs dissipate static electricity, reducing spark risks in natural gas pipelines.
  • API 607 fire-safe: Metal backup seals maintain sealing if PEEK/PTFE degrades in fire, meeting oil & gas safety regulations.

IV. Manufacturing Processes

• Forging & Heat Treatment: F316L ingots are forged to dense blanks, eliminating casting defects. Forgings undergo solution annealing (1050℃ quenching) to enhance corrosion resistance and toughness.
• Precision Machining: Ball and trunnion surfaces are CNC-ground to Ra ≤0.8μm for uniform seat contact. Reduced bore dimensions are machined to tight tolerances (±0.02mm) to ensure flow accuracy.
• Seal Assembly: PEEK seats are compression-molded and precision-cut to match ball contours. For high-pressure applications, seats are pre-loaded to maintain contact under pressure fluctuations.
• Flange Welding & Inspection: Forged flanges are welded to the body, then X-ray inspected to detect defects. Post-weld heat treatment relieves residual stress, preventing cracking under thermal cycling.
• Testing:
  • Hydrostatic Test: Body tested at 15.0MPa (1.5×600LB) for 30 minutes; seat tested at 11.0MPa (1.1×600LB) with water to verify zero leakage.
  • NACE Test: Material samples undergo sulfide stress cracking testing to comply with MR0175.
  • Operation Test: 500+ open/close cycles with actuators to confirm smooth operation and consistent