904L National Standard Flange Ball Valve is a specialized isolation valve engineered for extreme chemical resistance, particularly in environments involving strong reducing acids. By combining 904L (Super Austenitic Stainless Steel) with the rigorous GB/T 12237 manufacturing standard, this valve provides a high-integrity solution for standardized domestic piping systems that handle aggressive media where standard 316L would fail.
Description
904L (00Cr20Ni25Mo4.5Cu) is a high-alloy austenitic stainless steel designed for severe corrosion service:
- Superior Sulfuric Acid Resistance: The addition of Copper grants 904L exceptional resistance to sulfuric acid across a wide range of concentrations and temperatures, unlike standard stainless steels.
- Pitting & Crevice Immunity: With high nickel (approx. 25%) and molybdenum (4.5%) content, the valve is highly resistant to pitting in chloride-bearing environments and brackish water.
- Stress Corrosion Cracking (SCC) Defense: The high nickel concentration provides a robust barrier against SCC, maintaining structural integrity in volatile industrial settings.
- Non-Magnetic Properties: As a fully austenitic steel, 904L remains non-magnetic even after heavy cold working or welding.
Features
- GB Standard Compliance: Fully compliant with GB/T 12237 (design), GB/T 9113 (flange), and GB/T 12221 (face-to-face), ensuring seamless technical integration into National Standard industrial infrastructure.
- Full Bore Flow Efficiency: The internal diameter of the ball matches the pipe’s bore exactly. This provides an unobstructed flow path that minimizes turbulence and ensures negligible pressure drop.
- High-Integrity Sealing: Equipped with precision-ground 904L balls and advanced seat materials (such as RPTFE or PPL). This ensures a bubble-tight, leak-proof seal even after frequent operation in acidic media.
- Fire-Safe & Anti-Static Design: Typically includes an anti-static device to discharge built-up electricity and a fire-safe structure to maintain sealing integrity in emergency high-heat scenarios.
- Smooth Operation: The quarter-turn mechanism is optimized for low-torque performance, supporting manual hand-levers, gear operators, or automated 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 | 904L Super Austenitic Steel (00Cr20Ni25Mo4.5Cu) |
| Pressure Rating | PN16, PN25, PN40, PN64 |
| Seat Material | PTFE, RPTFE, PPL, or Metal-to-Metal |
| Testing Standard | GB/T 13927 / JB/T 9092 |
Applications
- Chemical Manufacturing: Production and transport of concentrated sulfuric, phosphoric, and acetic acids.
- Petrochemical Refining: High-chloride cooling water systems and aggressive catalyst management.
- Pharmaceutical & Food: High-purity acid handling where material integrity is critical to prevent batch contamination.
- Fertilizer Production: Handling of phosphoric acid and complex chemical fertilizers.
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