2205 Duplex Stainless Steel National Standard Flange Gate Valve is a high-performance isolation valve engineered for environments where standard stainless steels fail. By combining the high mechanical strength of 2205 Duplex steel with strict GB/T 12234 standards, this valve provides a robust solution for handling corrosive media in industrial and maritime applications.
Description
2205 (022Cr22Ni5Mo3N / S32205) is a ferritic-austenitic stainless steel designed to offer a superior balance of properties:
- High Yield Strength: Approximately double that of austenitic stainless steels (like 316L), allowing for a more rigid and durable valve body under high pressure.
- Exceptional Pitting Resistance: Superior performance in chloride-bearing environments, significantly reducing the risk of localized corrosion.
- SCC Resistance: The dual-phase microstructure provides high resistance to Chloride Stress Corrosion Cracking (SCC), a common cause of failure in chemical processing.
- Erosion Protection: Harder surface properties make it more resistant to the wearing effects of high-velocity fluids.
Features
- GB Standard Compliance: Manufactured to GB/T 12234, GB/T 9113, and GB/T 12221, ensuring full dimensional compatibility with domestic Chinese piping systems.
- Full Bore Architecture: The gate retracts completely, providing a straight-through flow path with minimal pressure loss and no obstruction.
- Reliable Wedge Sealing: Features a wedge-type gate that provides a tight, leak-proof shut-off, ensuring safe isolation for maintenance or emergency scenarios.
- Rising Stem (OS&Y): The outside screw and yoke design keeps the stem threads outside the media, preventing corrosion and allowing for easy lubrication and visual status checks.
Specifications
| Feature | Specification |
| Design Standard | GB/T 12234 |
| Flange End | GB/T 9113 / JB/T 79 |
| Face-to-Face | GB/T 12221 |
| Body Material | 2205 Duplex Steel (022Cr22Ni5Mo3N / CD3MN) |
| Pressure Rating | PN16, PN25, PN40, PN64 |
| Temperature Range | -40°C to 280°C (embrittlement can occur at higher temps) |
| Testing Standard | GB/T 13927 / JB/T 9092 |
Applications
- Chemical & Petrochemical: Refineries and chemical processing units handling chlorides and organic acids.
- Marine Engineering: Seawater cooling systems, offshore oil platforms, and ship ballast lines.
- Water Treatment: Desalination plants and wastewater facilities where high corrosion resistance is mandatory.
- Pulp & Paper: Handling corrosive liquors and bleaching agents in paper manufacturing.
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