904L National Standard Flange Gate Valve

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

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.