Engineered for severe high-temperature and high-pressure services, the Class 900 API 600 WC9 Alloy Steel High Temperature Bevel Gear Flanged Gate Valve delivers exceptional structural integrity and reliable flow isolation.
Manufactured from premium WC9 alloy steel (ASTM A217), this valve provides outstanding creep strength and oxidation resistance in continuous high-temperature environments. Designed strictly to API 600 standards, it features a robust Class 900 pressure rating and standard flanged connections (ASME B16.5). Equipped with a heavy-duty bevel gear operator, this valve significantly reduces operating torque for smooth and precise manual control. It is the ultimate solution for critical main steam, reheat steam, and refinery piping systems requiring reliable high-temperature isolation.
Key Features & Benefits
• WC9 Alloy Steel Construction: Crafted from ASTM A217 WC9 chrome-moly alloy steel, providing superior creep resistance, hih-temperature strength, and structural integrity in severe thermal cycling environments.
• API 600 Standard Compliance: Designed and manufactured strictly to API 600 specifications, ensuring dimensional compatibility, structural safety, and reliable performance in global oil, gas, and power infrastructure.
• Bevel Gear Operator: Equipped with a precision bevel gear mechanism to reduce operating torque, enabling smooth, precise, and effortless manual control for large-bore or high-pressure Class 900 valves.
• Class 900 Flanged Connections: Compliant with ASME B16.5 standards, ensuring easy installation, secure sealing (RF or RTJ), and leak-proof performance in high-pressure 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 high-temperature 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, high-temperature corrosion, and galling, ensuring long service life.
Technical Specifications
Parameter | Specification |
Valve Type | Flanged Gate Valve |
Design Standard | API 600, ASME B16.34 |
Body Material | Alloy Steel (ASTM A217 WC9) |
End Connection | Flanged (RF/RTJ) per ASME B16.5 |
Pressure Rating | Class 900 |
Size Range | 2" to 24" (DN50 - DN600) |
Temperature Range | -29°C to +595°C |
Operation | Bevel Gear Operator |
Trim Material | WC9 + Stellite 6 Hard-Faced |
Testing & Inspection | API 598 |
Applications
This high-performance Class 900 WC9 bevel gear gate valve is widely deployed in:
• Power Generation: Main steam, reheat steam, and high-pressure feedwater lines in thermal and nuclear power plants.
• Oil Refineries: High-temperature crude oil, hot product pipelines, and coker units.
• Petrochemical Plants: High-temperature and high-pressure fluid isolation in critical cracking and processing units.
• Industrial Boilers: High-pressure steam generation and distribution headers.
• Heavy Industry: Any high-temperature piping systems requiring reliable manual gear operation and API 600 compliance.
FAQ
Q: What is the advantage of using WC9 alloy steel for gate valves?
A: WC9 is a chrome-moly alloy steel specifically designed for high-temperature applications. It offers excellent creep strength and oxidation resistance, preventing the valve body from deforming or failing under continuous exposure to extreme heat (up to 595°C) and high pressure.
Q: Why choose a bevel gear operator for a Class 900 gate valve?
A: Class 900 valves have high sealing forces and large diameters, making manual handwheel operation difficult. A bevel gear operator significantly reduces the required operating torque, enabling smooth, precise, and safe manual control without excessive physical effort.
Q: What does API 600 mean for flanged gate valves?
A: API 600 is the American Petroleum Institute standard for steel gate valves with flanged and butt-welding ends. It specifies strict requirements for design, materials, dimensions, and testing, ensuring the valve meets the rigorous demands of the petroleum, petrochemical, and allied industries.
