III. Structural Features

• Side-Entry Design: Valve body splits horizontally, allowing access to internal components (ball, seat, stem) without disconnecting from the pipeline. This reduces maintenance downtime by 60% compared to top-entry valves, critical for continuous-process industries.
• Trunnion-Mounted Ball: Ball is supported by upper and lower trunnions, distributing pressure loads to prevent deformation. This design eliminates “ball blowdown” risk in high-pressure systems, ensuring stable operation even under flow surges.
• Metal-to-Metal Seating: Precision-lapped metal surfaces (Ra ≤0.8μm) create a bubble-tight seal (ANSI FCI 70-2 Class V). The seat features a spring-loaded design to compensate for thermal expansion, maintaining tightness across temperature cycles.
• Safety Enhancements:
  • Anti-blowout stem: Prevents stem ejection under high pressure, meeting API 600 safety standards.
    – 防静电装置（Anti-static）: Stainless steel spring connects ball and body, dissipating static (resistance ≤10⁶Ω) to avoid sparks in flammable environments.
  • Fire-safe construction: Graphite backup seals ensure basic shut-off after fire, compliant with API 607.

IV. Manufacturing Processes

• Material Forging: Body and ball are forged (forging ratio ≥3) to eliminate casting defects, enhancing structural strength. Raw materials undergo spectral analysis to verify chemical composition (e.g., 316: 16-18% Cr, 10-14% Ni).
• Precision Machining:
  • Ball and seat: CNC-ground to achieve roundness ≤0.01mm and surface finish Ra ≤0.8μm, ensuring uniform contact.
  • Trunnions: Machined to tight tolerances to align with the ball, reducing friction and wear.
• Seat Assembly: Spring-loaded seats are pre-tested at 1.5×rated pressure to validate compensation capability; metal surfaces are coated with anti-galling compounds (e.g., molybdenum disulfide) for smooth operation.
• Testing: Each valve undergoes:
  • Hydrostatic shell test (1.5×rated pressure, 30 minutes) to check for leaks.
  • Gas tightness test (0.6MPa nitrogen) with leakage ≤0.1×10⁻⁶ mL/s.
  • Cycle test (1000+ operations) to verify durability.