5A National Standard Flange Ball Valve is a top-tier isolation solution engineered for extreme industrial service. By utilizing 5A Super Duplex Stainless Steel (CE3MN) and adhering to the GB/T 12237 standard, this valve provides world-class resistance to pitting and stress corrosion, combined with the mechanical strength necessary for high-pressure National Standard piping systems.
Description
5A (ASTM A890 Grade 5A / CE3MN / 022Cr25Ni7Mo4N) is a super duplex stainless steel designed for environments where even standard duplex (4A) may reach its limits:
- Exceptional SCC Defense: The balanced dual-phase microstructure ensures the valve is virtually immune to chloride-induced stress corrosion cracking (SCC), making it essential for offshore and coastal industrial service.
- Elite Pitting Resistance: With a PREN (Pitting Resistance Equivalent Number) typically greater than or equal to 40, 5A provides maximum protection against localized corrosion in high-temperature seawater and concentrated brine.
- Maximum Mechanical Strength: Offers significantly higher yield strength and impact toughness than standard austenitic steels, allowing the valve body to withstand severe pressure cycles and mechanical fatigue.
Features
- GB Standard Compliance: Fully compliant with GB/T 12237 (design), GB/T 9113 (flange), and GB/T 12221 (face-to-face), ensuring perfect technical compatibility with standardized domestic infrastructure.
- Full Bore Design: The internal flow path matches the pipe’s diameter exactly. This eliminates flow restriction, prevents media buildup, and ensures negligible pressure drop across the valve.
- High-Precision Sealing: Features a mirror-polished 5A super duplex ball paired with high-performance seats (such as RPTFE or PPL). This combination ensures a “bubble-tight” seal even in high-frequency cycling.
- Safety & Reliability: Includes a blow-out proof stem, anti-static devices, and a robust fire-safe structural design to ensure operational safety in volatile petrochemical environments.
- Streamlined Actuation: The quarter-turn mechanism is designed for low-torque operation, supporting manual levers, gearboxes, or seamless integration with pneumatic and electric actuators.
Specifications
| Feature | Specification |
| Design Standard | GB/T 12237 |
| Flange Dimensions | GB/T 9113 / JB/T 79 |
| Face-to-Face | GB/T 12221 |
| Body Material | 5A Super Duplex Steel (CE3MN / 022Cr25Ni7Mo4N) |
| Pressure Rating | PN16, PN25, PN40, PN64, PN100, PN160 |
| Seat Material | PTFE, RPTFE, PPL, or Metal-to-Metal |
| Testing Standard | GB/T 13927 / JB/T 9092 |
Applications
- Offshore & Marine: Seawater cooling, ballast systems, and offshore oil and gas production.
- Chemical Processing: Handling high-temperature organic acids, oxidizing chlorides, and acidic chemical slurries.
- Desalination: Critical high-pressure lines and brine handling in reverse osmosis (RO) plants.
- Power Generation: Chemical treatment and cooling water loops in coastal power facilities.
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