Duplex 2205 (UNS S31803 / S32205) Butterfly Valves

Falcon High-Performance Duplex 2205 (UNS S31803 / S32205) Butterfly Valves

At Falcon, we design and manufacture industrial-grade Duplex 2205 Butterfly Valves engineered for superior strength, bi-directional zero-leakage isolation, and extreme pitting resistance in harsh industrial environments. Cast in high-purity ASTM A890 Grade 4A (UNS J92205 / CD3MN) and forged from ASTM A182 F51 / F60, our Duplex 2205 valves deliver twice the mechanical yield strength of standard austenitic 316L stainless steel alongside exceptional resistance to chloride stress-corrosion cracking.

Why Upgrade to Falcon Duplex 2205?

• Double the Mechanical Strength: High yield strength allows for lightweight, compact valve designs that withstand higher line pressures and water hammer without body deflection.

• Chloride Pitting & Crevice Corrosion Protection: High PREN ($\ge 34$) delivers outstanding performance in seawater, brackish water, and high-chloride chemical streams where standard 316/316L stainless steel suffers rapid pitting.

• Immunity to Stress-Corrosion Cracking (SCC): The balanced $50/50$ austenitic-ferritic microstructure completely eliminates chloride-induced stress corrosion cracking in warm, aggressive process environments.

• Lower Total Cost of Ownership: Extended service life and minimal maintenance requirements drastically reduce plant downtime and long-term operating costs.

• Bi-Directional Zero-Leakage Performance: Precision-engineered disc geometry combined with resilient or metal seating delivers reliable ISO 5208 Rate A / API 598 bubble-tight shut-off.

Valve Configurations Offered

• Concentric Resilient / PTFE-Lined Butterfly Valves:

  • Design: Fully encapsulated body and disc options for corrosive chemical handling.

  • Best For: Acid transfer lines, water treatment, and general chemical processing.

• Double-Offset (High-Performance) Butterfly Valves:

  • Design: Cam-action eccentric shaft layout minimizes seat friction during quarter-turn rotation, significantly prolonging seal life.

  • Best For: High-cycle throttling, reverse osmosis pump isolation, and medium-pressure industrial utilities.

• Triple-Offset (Bi-Directional Zero-Leakage) Butterfly Valves:

  • Design: Frictionless metal-to-metal seating geometry capable of tight shut-off in extreme temperature and high-velocity conditions.

  • Best For: Offshore oil & gas platforms, firewater loops, and abrasive slurry applications where soft elastomeric seats fail.

Primary Target Applications

• Desalination & Reverse Osmosis (RO): High-pressure sea water feed, RO membrane isolation, and concentrated brine reject loops.

• Chemical & Petrochemical Refining: Organic acid transfer, vinyl chloride monomer (VCM) processing, and chloride-laden chemical utilities.

• Offshore Oil & Gas platforms: Topside seawater cooling, ballast water management systems, and produced water disposal skids.

• Pulp & Paper Industry: White/black liquor lines, bleaching processes, and digester circulation.

Quality Assurance & Testing Standards

Every Falcon Duplex 2205 Butterfly Valve undergoes rigorous quality control and non-destructive testing before dispatch:

• 100% Positive Material Identification (PMI) on body, disc, and stem to verify exact $22\%\text{ Cr}$ duplex alloy chemistry.

• Ferrite Content Verification: Microstructure checks per ASTM E562 to ensure optimal $40\text{--}60\%$ ferrite phase balance.

• Hydrostatic Shell & Bi-Directional Seat Testing per API 598 and ISO 5208.

• Non-Destructive Examination (NDE): Radiographic (RT), Liquid Penetrant (PT), and Ultrasonic (UT) testing options per ASME B16.34.

• EN 10204 Type 3.1 & Type 3.2 Material Test Reports (MTRs) provided for full heat traceability.

Request a Quote or Engineering Support

Upgrade your process piping reliability with Falcon Duplex 2205 Butterfly Valves. Whether you need standard off-the-shelf sizes or custom automated valve packages, our technical team is ready to review your project specifications.

Contact Falcon Today