321 National Standard Flange Gate Valve

Description

321 Stainless Steel (06Cr18Ni11Ti) is an austenitic steel similar to 304, but with the vital addition of Titanium. This offers distinct technical benefits:

• Intergranular Corrosion Resistance: Titanium has a stronger affinity for carbon than chromium does. This prevents chromium carbide precipitation when the valve is exposed to temperatures between 425°C and 815°C, keeping the valve’s structure intact.
• High-Temperature Durability: Offers better stress rupture and creep resistance than 304 or 316 stainless steel, ensuring reliable operation under prolonged heat.
• Oxidation Resistance: Maintains a stable surface and mechanical properties in intermittent heating and cooling cycles.

Features

• GB Standard Compliance: Fully compliant with GB/T 12234 (design), GB/T 9113 (flange), and GB/T 12221 (face-to-face), guaranteeing dimensional accuracy and easy maintenance within standardized domestic systems.
• Full Bore Architecture: The gate lifts completely out of the flow stream, providing zero obstruction and minimal pressure drop—perfect for high-velocity gas or liquid lines.
• Wedge-Type Flexible Gate: Designed to provide a tight seal while remaining flexible enough to compensate for minor seat deviations caused by thermal expansion.
• Rising Stem (OS&Y): The outside screw and yoke design keeps the operating threads away from the media, ensuring the valve is easy to operate and lubricate even in harsh conditions.

Specifications

Applications

• Aerospace & Defense: Exhaust manifolds, stack liners, and high-temperature pressure vessels.
• Petrochemical: Refineries and chemical processing units operating in the carbide precipitation range.
• Power Generation: Boiler casings, superheater tubes, and high-temperature steam lines.
• Waste Incineration: Handling hot gases and corrosive thermal byproducts.