904L National Standard Flange Gate Valve is a premium, high-alloy isolation valve engineered for the most severe corrosive environments. By utilizing 904L (Super Austenitic Stainless Steel) and adhering to GB/T 12234 standards, this valve provides exceptional resistance to strong reducing acids—specifically sulfuric acid—where standard 316L would rapidly fail.
Description
904L (00Cr20Ni25Mo4.5Cu) is a non-stabilized low carbon high alloy austenitic stainless steel. Its unique chemical composition offers professional-grade protection:
- Exceptional Sulfuric Acid Resistance: The addition of copper to the alloy gives it vastly superior resistance to high concentrations of sulfuric acid compared to traditional stainless steels.
- Pitting and Crevice Defense: High nickel and molybdenum content provides excellent resistance to chloride-induced pitting and crevice corrosion.
- Stress Corrosion Cracking (SCC) Stability: The high nickel content ensures the valve remains stable and resistant to SCC in harsh chemical processing environments.
- Non-Magnetic Properties: Maintains a completely austenitic structure, even after cold working, making it suitable for specialized industrial applications.
Features
- GB Standard Compliance: Fully compliant with GB/T 12234 (design), GB/T 9113 (flange), and GB/T 12221 (face-to-face), ensuring a perfect fit and reliable performance in standardized domestic pipeline networks.
- Full Bore Flow: The gate retracts fully out of the flow stream, ensuring unrestricted flow and minimal pressure drop, which is critical for maintaining system efficiency in chemical plants.
- Precision Sealing: Features a wedge-type gate that provides a high-integrity, leak-proof seal, ensuring safe isolation of hazardous or expensive chemical media.
- Reliable Stem Design: The rising stem (OS&Y) design keeps the operating threads outside the media flow, preventing thread corrosion and allowing for easy maintenance and lubrication.
Specifications
| Feature | Specification |
| Design Standard | GB/T 12234 |
| Flange End | 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 |
| Temperature Range | -29°C to 450°C |
| Testing Standard | GB/T 13927 / JB/T 9092 |
Applications
- Chemical Industry: Production and handling of sulfuric, phosphoric, and acetic acids.
- Petrochemical Refining: Equipment handling high-chloride cooling water and aggressive chemical catalysts.
- Pollution Control: Flue gas desulfurization (FGD) systems in power plants.
- Pharmaceutical & Food: High-purity environments where maximum corrosion resistance is required to prevent product contamination.
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