Engineered for the most aggressive and demanding environments, the 300LB API 600 CF8C Duplex Steel Large Bore Flanged Gate Valve delivers unmatched strength and corrosion resistance.
Manufactured from premium CF8C duplex stainless steel, this valve combines the high mechanical strength of ferritic steel with the excellent corrosion resistance of austenitic steel. It is specifically designed to resist chloride pitting, crevice corrosion, and stress corrosion cracking. Designed strictly to API 600 standards, this large bore gate valve features a robust bolted bonnet construction and an Outside Screw and Yoke (OS&Y) rising stem design. Equipped with standard flanged connections (ASME B16.5), this Class 300 valve ensures reliable flow isolation, minimal pressure drop, and exceptional durability in critical offshore, chemical, and desalination piping systems.
Key Features & Benefits
• CF8C Duplex Steel Construction: Crafted from CF8C duplex stainless steel, providing outstanding resistance to chlorides, hydrogen sulfide, and acidic environments, while offering higher yield strength than standard austenitic grades.
• Large Bore Full Port Design: The large bore design matches the pipeline diameter, minimizing flow resistance, reducing prssure drop, and facilitating pipeline pigging operations in high-volume transmission lines.
• API 600 & Bolted Bonnet Design: Manufactured to strict API 600 standards, ensuring dimensional compatibility, structural safety, and reliable performance in global industrial infrastructure.
• Flanged End Connections: Compliant with ASME B16.5 standards, ensuring easy installation, secure sealing (RF or RTJ), and leak-proof performance in Class 300 piping systems.
• OS&Y Rising Stem Mechanism: Features an Outside Screw and Yoke design with a non-rotating rising stem, providing a clear visual indication of valve position and protecting stem threads from corrosive media exposure.
• Stellite Hard-Faced Trim: Seat rings and wedge seating surfaces are overlaid with Stellite 6 (Co-Cr-W alloy) to resist severe erosion, corrosion, and galling, ensuring long service life in aggressive media.
Technical Specifications
Parameter | Specification |
Valve Type | Large Bore Flanged Gate Valve |
Design Standard | API 600, ASME B16.34 |
Body Material | CF8C Duplex Stainless Steel |
End Connection | Flanged (RF/RTJ) per ASME B16.5 |
Pressure Rating | Class 300 (PN50) |
Size Range | 10" to 48" (DN250 - DN1200) |
Temperature Range | -50°C to +300°C |
Trim Material | CF8C, Monel, or Stellite Hard-Faced |
Operation | Manual Handwheel / Gear Operator |
Testing & Inspection | API 598 |
Applications
This high-performance CF8C duplex steel gate valve is widely deployed in:
• Offshore & Marine Engineering: Seawater cooling systems, offshore platforms, and shipbuilding requiring superior saltwater corrosion resistance.
• Desalination Plants: High-pressure seawater intake and brine discharge pipelines.
• Chemical & Petrochemical Processing: Handling chlorides, sulfuric acid, phosphoric acid, and other highly corrosive media.
• Oil & Gas Pipelines: Sour gas (H2S) environments and high-volume transmission lines requiring high strength and corrosion resistance.
• Pulp & Paper Industry: Corrosive chemical processing and bleaching lines.
FAQ
Q: What does CF8C mean in duplex steel gate valves?
A: CF8C is an ASTM A351 standard casting grade for duplex stainless steel. It combines high mechanical strength with excellent resistance to chloride pitting, crevice corrosion, and stress corrosion cracking, making it ideal for marine and aggressive chemical environments.
Q: Why choose a large bore design for gate valves?
A: A large bore (full port) design ensures the internal flow area matches the pipeline diameter. This minimizes flow resistance, reduces pressure drop, and allows for pipeline pigging operations, which is critical for high-volume transmission lines and process pipelines.
Q: How does CF8C compare to standard 304/316 stainless steel?
A: CF8C duplex steel offers significantly higher yield strength and superior resistance to chloride-induced corrosion compared to standard 304 or 316 stainless steels. It is specifically engineered for applications where both high mechanical strength and extreme corrosion resistance are required.
