4A National Standard Flange Globe Valve

Description

4A (UNS J92205 / CD3MN) is a ferritic-austenitic stainless steel that outperforms standard 300-series alloys in harsh industrial conditions:

• Erosion Resistance: The higher surface hardness of duplex steel protects the internal seating surfaces from the “wire-drawing” effect often seen during high-velocity throttling.
• Twice the Strength: The yield strength of 4A is roughly double that of 316L, allowing for a more rigid valve body that withstands higher pressure surges.
• Superior Corrosion Resistance: Specifically formulated to resist localized corrosion, making it ideal for chloride-bearing media, seawater, and aggressive chemical solutions.

Features

• Precise Throttling & Regulation: The globe-style design is optimized for flow modulation. The linear movement of the disc allows for incremental adjustments, making it the superior choice for systems requiring frequent flow tuning.
• High-Integrity Shut-off: When fully closed, the disc and seat ring provide a high-pressure seal with zero leakage, ensuring safe isolation in volatile chemical or gas lines.
• GB Standard Compliance: Fully compliant with GB/T 12233 (design), GB/T 9113 (flange), and GB/T 12221 (face-to-face), ensuring seamless integration into standardized domestic piping networks.
• Durable Stem Design: Features a rising stem with precision-ground threads to ensure smooth operation and clear visual indication of the valve’s open or closed status.

Specifications

Applications

• Chemical Processing: Accurate control of corrosive acids, organic fluids, and chemical catalysts.
• Marine & Offshore: Seawater cooling systems and offshore production platforms where chloride resistance is mandatory.
• Desalination: Brine and high-salinity water flow regulation.
• Power Generation: High-pressure feed water and chemical injection systems.