III. Features Description

• Quarter-Turn Operation: The plug rotates 90° to open/close, reducing operating time by 50% compared to multi-turn valves. This is critical for emergency shut-off in natural gas or oil pipelines, where rapid response minimizes leakage risks.
• Metal-to-Metal Hard Sealing: The plug and valve body sealing surfaces are precision-ground (Ra ≤0.8μm) and lapped together, forming a tight seal that withstands high pressure and media erosion. It achieves ANSI/FCI Class V leakage (≤0.001% of flow), suitable for toxic or flammable media.
• Lubrication System: Optional lubricant injection ports allow grease to be added to the plug surface, reducing friction during rotation and enhancing sealing. This extends service life in dusty or high-viscosity media (e.g., heavy oil) applications.
• 2/3-Way Versatility: Available in 2-way (on-off) or 3-way (flow direction control) configurations. 3-way models enable media diversion or mixing, eliminating the need for multiple valves in chemical dosing or heating systems.
• Corrosion Resistance: SS316 and CF3M materials resist pitting from chlorides (e.g., seawater in offshore platforms) and oxidation from high-temperature steam, avoiding rust-related jamming or leakage.

IV. Manufacturing Processes

• Material Preparation: Stainless steel castings (SS316/CF3M) undergo ultrasonic testing to detect internal defects. Chemical analysis verifies alloy content (Cr16-18%, Ni10-14%, Mo2-3% for SS316) to ensure corrosion resistance.
• Plug & Body Machining: CNC machining centers precision-machine the plug and valve body to achieve a conical fit (tolerance ±0.02mm), ensuring uniform contact across the sealing surface. The sealing face is ground to Ra ≤0.8μm for tight sealing.
• Sealing Surface Treatment: Metal sealing surfaces are hardened via nitriding (surface hardness ≥50HRC) to resist wear from repeated plug rotation, maintaining sealing performance over 10,000+ cycles.
• Assembly & Testing:
  • Hydrostatic Test: Body tested at 1.5×rated pressure (2.4MPa for PN1.6) for 30 minutes; seat tested at 1.1×rated pressure (1.76MPa) with water to confirm no leakage.
  • Operation Test: 100+ open/close cycles to verify smooth rotation and consistent sealing, with special focus on lubrication system functionality.
  • Corrosion Test: SS316 components undergo 48-hour salt spray testing to validate resistance to rust and oxidation.