III. Features Description

• Precise Throttling Control: The globe valve’s linear stem movement (disc lifts/lowers perpendicular to flow) creates a variable flow area, enabling fine flow rate adjustment. This makes it superior to ball valves for applications requiring stable regulation (e.g., controlling fuel supply to industrial burners).
• Global Standard Compatibility: Flange dimensions, face-to-face lengths, and pressure ratings align with ANSI, BS, DIN, JIS, and API standards. This eliminates installation barriers in cross-border projects, from North American refineries to European chemical plants.
• Metal Hard Sealing Reliability: Metal-to-metal seals maintain tight shut-off under 600LB pressure and 425℃ temperature, outperforming soft seals in high-pressure steam or hot oil systems. They avoid degradation from heat or pressure surges, ensuring long-term sealing integrity.
• Cost-Effective Durability: WCB material balances performance and cost, avoiding the premium of stainless steel for non-corrosive media. Cast construction eliminates internal defects, while precision-machined components reduce maintenance needs, lowering lifecycle costs.
• Straightforward Maintenance: Flanged connections allow easy disassembly for seal replacement or stem lubrication. Standardized parts (e.g., gaskets, stems) simplify spare part procurement globally.

IV. Manufacturing Processes

• Casting: WCB steel is melted and poured into precision molds. Automated casting ensures uniform density; post-casting annealing relieves internal stresses to prevent warping.
• Machining: Valve body, disc, and stem are CNC-machined to tight tolerances (±0.02mm). Seal faces are ground to Ra ≤1.6μm, ensuring uniform contact between seat and disc for tight sealing.
• Seal Assembly: Metal seats are press-fitted or welded into the body; stellite coating is applied via plasma welding, then lapped for flatness. Flange gasket grooves are machined to match standard dimensions (e.g., ANSI B16.5 RTJ grooves).
• Testing:
  • Hydrostatic Shell Test: 150LB valves tested at 3.0MPa, 600LB at 15.0MPa for 30 minutes to check for body leaks.
  • Seat Leakage Test: 1.1×rated pressure (e.g., 2.2MPa for 150LB) with water, ensuring leakage ≤0.1×DN (mm)/min (API 598 standards).
  • Operation Test: 100+ open/close cycles verify smooth handwheel operation and consistent sealing.