4A National Standard Three-Way Ball Valve is a high-performance flow control solution designed for complex piping systems in corrosive environments. By utilizing 4A Duplex Stainless Steel (CD3MN) and adhering to GB/T 12237 standards, this valve allows for the diversion, mixing, or isolation of aggressive media within a single valve body, significantly reducing the footprint and cost of industrial installations.
Description
4A (ASTM A890 Grade 4A / CD3MN / 022Cr22Ni5Mo3N) is a ferritic-austenitic stainless steel that provides elite durability where standard alloys fall short:
- SCC Defense: The dual-phase microstructure offers inherent protection against chloride-induced stress corrosion cracking (SCC).
- Elite Corrosion Resistance: Exceptional resistance to pitting and crevice corrosion, specifically in seawater, brine, and acidic chemical environments.
- High Yield Strength: Roughly double the strength of 316L stainless steel, providing the structural integrity required to handle high pressure cycles and mechanical stress.
Features
- GB Standard Compliance: Fully compliant with GB/T 12237 (design), GB/T 9113 (flange), and GB/T 12221 (face-to-face), ensuring seamless integration into National Standard industrial piping.
- Space-Saving Efficiency: By replacing multiple two-way valves and tee-fittings with a single 4A three-way valve, users can reduce leak points and simplify system maintenance.
- Precision-Ground Ball: The 4A duplex ball is precision-machined to ensure smooth rotation and a “bubble-tight” seal against RPTFE or PPL seats, even in high-cycle automation.
- Advanced Safety: Features a blow-out proof stem and anti-static design, making it safe for use in volatile chemical and petrochemical environments.
- Ease of Automation: The ISO 5211 mounting pad allows for direct installation of pneumatic or electric actuators for remote flow diversion and mixing.
Specifications
| Feature | Specification |
| Design Standard | GB/T 12237 |
| Flange Dimensions | GB/T 9113 / JB/T 79 |
| Face-to-Face | GB/T 12221 / Manufacturer Standard |
| Body Material | 4A Duplex Steel (CD3MN / 022Cr22Ni5Mo3N) |
| Pressure Rating | PN16, PN25, PN40, PN64 |
| Seat Material | PTFE, RPTFE, PPL, or PEEK |
| Testing Standard | GB/T 13927 / JB/T 9092 |
Applications
- Chemical Processing: Precise diversion and mixing of organic acids and chemical slurries.
- Marine & Offshore: Seawater cooling systems and ballast water management where space is limited.
- Desalination: Managing brine and treated water flow paths in RO plants.
- Industrial Automation: High-reliability switching in automated manufacturing and refining lines.
