Inconel 825 / Incoloy 825 (UNS N08825 / CU5MCuC) Gate Valves

Falcon High-Performance Inconel 825 / Incoloy 825 (UNS N08825 / CU5MCuC) Gate Valves

At Falcon, we engineer and manufacture heavy-duty Inconel 825 Gate Valves designed for full-bore, low-pressure-drop isolation and superior corrosion resistance in severe acid processing and sour gas oilfield environments. Cast in high-purity ASTM A494 Grade CU5MCuC (Cast Inconel 825) and forged from ASTM B564 / B425 UNS N08825, our Inconel 825 gate valves combine a nickel-iron-chromium matrix with added copper, molybdenum, and titanium to deliver maximum protection against hot sulfuric acid, wet-process phosphoric acid, chloride pitting, and sulfide stress cracking.

Key Features & Advantages

• Superior Resistance to Sulfuric & Phosphoric Acids: Alloyed with  and  to provide exceptional resistance to hot sulfuric acid solutions and crude wet-process phosphoric acid streams.
• Immunity to Stress-Corrosion Cracking (SCC): High nickel matrix eliminates chloride-induced stress corrosion cracking in warm, highly reactive chemical process streams and sour oilfield fluids.
• Titanium-Stabilized Against Intergranular Corrosion: Titanium addition () prevents alloy sensitization during thermal cycles, protecting welded flanged ends and internal body-to-bonnet sealing faces against intergranular attack.
• Bi-Directional Zero-Leakage Seating: Precision-machined solid or flexible wedge profiles paired with hard-faced body seat rings ensure certified API 598 / ISO 5208 tight shut-off under fluctuating pressure differentials.
• Heavy-Duty OS&Y Construction: Outside Screw and Yoke (OS&Y) design keeps stem threads isolated from aggressive line media, preventing thread corrosion and galling while providing visual position indication.

Gate Valve Design Configurations Offered

• API 600 Bolted Bonnet Inconel 825 Gate Valves:
• Design: Heavy-duty cast construction with a flexible wedge to prevent thermal binding in high-temperature, high-differential-pressure pipelines ().
• Best For: Main process isolation in acid transfer lines, fertilizer plants, and offshore topsides.
• API 602 Forged Inconel 825 Gate Valves:
• Design: Compact forged body with bolted or welded bonnet for high-pressure, small-bore piping systems ().
• Best For: Instrument take-offs, chemical injection skids, and drain/vent isolation.
• Pressure Seal Inconel 825 Gate Valves:
• Design: Internal system pressure forces the bonnet seal tighter against the valve body, ideal for extreme high-pressure services (Class 900 to 1500).
• Best For: High-pressure sour gas gathering lines and high-temp chemical reactors.

Primary Industrial Applications

• Sulfuric & Phosphoric Acid Processing: Acid dilution skids, fertilizer production, phosphoric acid concentration loops, and metal pickling lines.
• Sour Oil & Gas (): Downhole sour gas gathering lines, gas treatment skids, and produced water disposal systems in compliance with NACE MR0175 / ISO 15156.
• Chemical & Petrochemical Refining: Organic acid synthesis, vinyl chloride monomer (VCM) units, and chemical washing towers.
• Nuclear & Chemical Waste: Nitric acid dissolvers, nuclear fuel element recovery, and aggressive waste stream containment.

Every Falcon Inconel 825 Gate Valve undergoes strict metallurgical testing and non-destructive examination prior to dispatch:

• 100% Positive Material Identification (PMI): Conducted on body, bonnet, wedge, and stem components
• NACE MR0175 / ISO 15156 Compliance
• Hydrostatic Shell & Seat Testing
• Fugitive Emissions Certified
• Non-Destructive Examination (NDE)
• EN 10204 Type 3.1 & Type 3.2 Material Test Reports (MTRs): Full heat number traceability provided with every shipment.

Protect your high-acid process lines and sour gas systems with Falcon Inconel 825 Gate Valves. Contact Falcon Today to speak with a technical sales engineer or request a fast, competitive quote for your upcoming project.