Inconel 600 Knife Gate Valves

Falcon Inconel 600 Knife Gate Valves

Versatile High-Temperature Performance and Corrosion Resistance

Falcon Inconel 600 Knife Gate Valves are the premier choice for applications requiring a combination of heat resistance and corrosion protection. Utilizing Alloy 600 (UNS N06600), these valves provide a robust solution for the chemical, aerospace, and nuclear industries.

1. The Inconel 600 Advantage

• Stress-Corrosion Cracking (SCC) Immunity: The high nickel content (72% minimum) provides exceptional resistance to chloride-ion SCC.

• High-Temperature Oxidation: Resists oxidation and scaling at temperatures where most stainless steels fail.

• Resistance to Alkalies: Excellent resistance to alkaline solutions (caustics) even at high temperatures.

• Cryogenic Toughness: Unlike many steels that become brittle, Inconel 600 maintains excellent mechanical properties in sub-zero environments.

2. Specialized Design & Engineering

• Precision-Guided Gate: The Inconel 600 gate is ground and polished to prevent "galling," which can be a common issue with high-nickel alloys during cycling.

• Thermal Expansion Compliance: The valve body is engineered with clearances that allow for expansion and contraction during rapid thermal cycling without compromising the seal.

• Corrosion-Resistant Gland: Features a multi-layered packing system, typically utilizing reinforced PTFE or flexible graphite for high-heat service.

• Bi-Directional Option: Falcon offers the 600 series in both uni-directional and bi-directional designs to suit specific piping layouts.

3. Technical Specifications

Parameter	Specification Details
Material Grade	Inconel 600 (ASTM A494 Grade CY40 / UNS N06600)
Composition	Nickel (72%), Chromium (14-17%), Iron (6-10%)
Pressure Class	ASME Class 150, 300, 600
Size Range	2" (DN50) to 48" (DN1200)
Sealing Standards	MSS SP-81 / ANSI Class VI
Testing	API 598 (Shell/Seat/Pneumatic)

4. Primary Industry Applications

• Nuclear Engineering: Used in primary and secondary systems of pressurized water reactors due to resistance to high-purity water corrosion.

• Chemical Processing: Handling magnesium chloride, caustic soda, and fatty acids at high temperatures.

• Aerospace: Airframe and engine components where high-strength and heat resistance are mandatory.

• Heat Treating: Ideal for furnace muffles, baskets, and fixtures where the valve is exposed to the furnace atmosphere.

• Vegetable Oil Processing: Resistant to corrosion by many organic acids.

Quality Control & Material Verification

Falcon ensures the integrity of every Inconel 600 valve through:

1. Positive Material Identification (PMI): Strict verification of the 72% Nickel minimum to ensure SCC immunity.

2. NDT Inspection: Dye Penetrant and Ultrasonic testing on all high-pressure castings to ensure a defect-free structure.

3. High-Temperature Functional Test: Optional testing to verify the valve's torque and sealing performance at the client’s actual operating temperature.

4. Full Traceability: Every valve includes an EN 10204 3.1 Material Test Report.

Comparison Note for Clients: 600 vs. 625

"While Inconel 625 is the better choice for liquid acid corrosion and seawater, Inconel 600 is the superior, more cost-effective choice for high-temperature oxidation and caustic environments."

Technical Comparison: Inconel 600 vs. 316L Stainless Steel for Caustic Service

 

In high-temperature alkaline environments (such as Sodium Hydroxide or Potassium Hydroxide), standard stainless steels suffer from a phenomenon known as Caustic Stress Corrosion Cracking (CSCC). Inconel 600 is specifically designed to eliminate this risk.

Resistance to Caustic Stress Corrosion Cracking (CSCC)

Environment	316L Stainless Steel	Falcon Inconel 600
Low Temp Caustic (< 50°C)	Suitable	Excellent
High Temp Caustic (> 100°C)	High Risk of Cracking	Immune / Highly Resistant
Molten Caustics	Rapid failure	Industry Standard Choice
Nickel Content	~10-14%	~72% (Minimum)