4A National Standard Flange Gate Valve

Description

4A (UNS J92205 / CD3MN) is a ferritic-austenitic duplex stainless steel that offers a balanced microstructure for peak performance:

• Erosion Resistance: The higher surface hardness of 4A material makes it ideal for pipelines carrying media with small particulates or high-velocity flows.
• High Mechanical Strength: The yield strength is nearly double that of austenitic stainless steels, allowing the valve to handle higher pressure loads with a more robust body.
• Corrosion Resilience: Specifically designed to resist pitting and crevice corrosion in chloride-bearing environments, such as seawater or brine.

Features

• GB Standard Compliance: Fully compliant with GB/T 12234 (design), GB/T 9113 (flange), and GB/T 12221 (face-to-face), ensuring seamless integration into domestic Chinese industrial and municipal projects.
• Full Bore Flow: The gate retracts completely out of the flow path, ensuring minimal pressure drop and unobstructed fluid movement.
• Tight Sealing Integrity: Precision-machined 4A wedge and seats provide a reliable, leak-proof shut-off, even in volatile chemical service.
• Robust Stem Design: Features a rising stem for easy visual confirmation of the valve position (open/closed) and an anti-blowout design for operational safety.

Specifications

Applications

• Petrochemical: Refineries and processing units handling sour crude or saline fluids.
• Marine & Offshore: Seawater cooling systems, offshore production platforms, and ship ballast lines.
• Chemical Processing: Handling organic acids, chlorides, and mixed chemical media.
• Water Treatment: Desalination plants and wastewater treatment facilities requiring high corrosion resistance.