III. Features Description

• Fluoropolymer Lining Corrosion Resistance: The PTFE/PFA/FEP lining forms a seamless barrier (thickness 2~3mm) that isolates the metal body from corrosive media. Chemically inert to 95% of industrial chemicals—including sulfuric acid, sodium hydroxide, and acetone—it eliminates metal corrosion, a common failure point in unlined valves.
• Floating Ball Design: The ball “floats” against the seat under media pressure, ensuring uniform sealing contact across the entire seat surface. This design adapts to minor pressure fluctuations, achieving ANSI/FCI Class VI leakage (near-zero) even in high-pressure (Class 900) applications.
• Anti-Blowout Stem: A one-piece stem with a retention shoulder prevents ejection under pressure, enhanced by PTFE packing that maintains sealing integrity without media contamination. This meets API safety standards for hazardous fluid handling.
• Versatile Actuation: Manual lever/worm operation for simple systems; pneumatic actuators for fast on-off in automated lines; electric actuators for precise throttling (0~90° rotation) in pharmaceutical or chemical dosing systems. All options integrate via ISO 5211 mounting pads.
• Fire-Safe Compliance: Optional fire-safe design (per API 607/6FA) ensures the valve maintains sealing after a fire, with metal backup seats preventing media release—a critical feature for petroleum and chemical plants.

IV. Manufacturing Processes

• Lining Preparation: Fluoropolymer resins (PTFE/PFA/FEP) are molded into liners matching the valve body’s internal shape. The lining is sintered (380℃~400℃ for PTFE) to achieve density ≥2.1g/cm³, ensuring no pores that could trap corrosive media.
• Body & Ball Machining: The metal body is sandblasted to roughen the surface, improving lining adhesion. The ball is precision-ground to Ra ≤0.8μm, then coated with fluoropolymer via electrostatic spraying for uniform thickness (0.1~0.2mm).
• Lining Integration: The sintered liner is inserted into the body and bonded using high-temperature adhesive, with pressure applied (5~10MPa) to ensure full contact. This prevents liner detachment under thermal expansion or pressure cycles.
• Assembly & Testing:
  • Hydrostatic Test: Body tested at 1.5×rated pressure (water) for 30 minutes; seat tested at 1.1×rated pressure (air) to verify no leakage.
  • Corrosion Test: Lined components immersed in 30% sulfuric acid for 72 hours—no lining damage or metal corrosion allowed.
  • Operation Test: 1,000+ open/close cycles to confirm smooth ball rotation and consistent sealing, with special focus on low friction in manual operation.