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J-VALVES
Design Features
CF8C Cast Stainless Steel Valve Body: Precision cast from ASTM A351 CF8C (347 stainless steel). Niobium (Nb) as a stabilizing element combines with carbon to form niobium carbide, preventing chromium depletion at grain boundaries and delivering excellent intergranular corrosion resistance. Its high-temperature creep strength and rupture strength are significantly superior to 304/316, making it suitable for high-temperature service up to 538℃ to 650℃.
2-inch Standard Bore: Nominal diameter DN50 is ideal for small and medium-flow high-temperature, high-pressure fluid delivery. Full port design facilitates pigging and system purging; reduced port is available for optimized cost efficiency.
1500LB Ultra-High-Pressure Class: Class 1500 (PN260) pressure rating, with a maximum working pressure of 25.5 MPa at ambient temperature, suitable for extreme conditions including supercritical steam, hydrogenation reactions, and high-temperature high-pressure chemical processes.
Flexible Wedge: Designed with an elastic slot at the center of the wedge, which automatically compensates for seat deformation at high temperatures, ensuring uniform contact of sealing surfaces and reliable high-temperature sealing.
Wedge-Type Gate: Available in solid wedge or double disc design, achieving sealing via medium pressure or external force, with simple structure and low flow resistance.
Full Open/Full Close Operation: When fully open, the flow passage matches the pipe inner diameter, resulting in extremely low pressure drop. When fully closed, sealing surfaces fit tightly for dependable shut-off.
Optional Flanged / Welded Ends: Flanged connections include RF (Raised Face) or RTJ (Ring-Type Joint) in accordance with ASME B16.5; Butt Weld (BW) ends conform to ASME B16.25. RTJ ring grooves ensure reliable metal-to-metal sealing under ultra-high pressure.
Outside Screw and Yoke (OS&Y): Stem threads are exposed; the stem rises and falls with the gate, providing clear visual indication of valve position, suitable for above-ground operation.
Inside Screw: Stem threads are enclosed; the stem remains stationary during gate movement, saving operating space and ideal for buried or space-constrained installations.
Bi-Directional Sealing: Both sides of the gate serve as sealing surfaces, allowing unrestricted installation direction and simplifying piping design and on-site construction.
High-Temperature Packing System: Equipped with flexible graphite, Inconel wire-reinforced graphite, or ceramic fiber packing, capable of withstanding temperatures up to +650℃. Pressure rating matches the valve body, preventing extrusion and leakage under high-temperature and high-pressure conditions.
Blowout-Proof Stem: A retaining structure is provided at the stem-gate connection, securing the stem within the valve body even under abnormal internal pressure, ensuring operational safety in ultra-high-pressure service.
Low-Emission Design: Optional low-leakage packing system compliant with ISO 15848-1, minimizing leakage of high-temperature volatile media.
Technical Parameters
Nominal Size: 2" (DN50)
Pressure Class: Class 1500 (PN260)
Temperature Range: -29℃ to +425℃
Body: Cast ASTM A351 CF8C (347 stainless steel)
Gate: CF8C, F321, F347, hardfaced with Stellite alloy
Stem: F316, F321, F347, Inconel 718, precipitation hardened
Seat: CF8C + Stellite hardfacing, F347 + Stellite hardfacing
Packing: Flexible graphite, Inconel wire-reinforced graphite, ceramic fiber, high-temperature composite packing
Gasket: Spiral-wound stainless steel graphite gasket, metal ring gasket (octagonal / oval)
Bolts: B8M CL.2 (316), B8C (347), Inconel 718, resistant to high-temperature relaxation
Gearbox / Actuator: Cast steel, high-temperature alloy steel, equipped with cooling fins and manual override
End Connection: Flanged (RF / RTJ) or Butt Weld (BW)
Operation: Manual (gearbox with extension rod or stand), electric (high-temperature on-off / modulating), pneumatic (high-temperature double-acting / spring return), hydraulic
Design Standard: ASME B16.34, API 600, API 602
Testing Standard: API 598
Face-to-Face Dimension: ASME B16.10
Applications
Supercritical Power Generation: Used in main steam, reheat steam, and feedwater systems of supercritical and ultra-supercritical thermal power units, resisting 650℃ high temperature and 25MPa ultra-high-pressure steam.
Petrochemical Cracking Units: Applied in high-temperature high-pressure oil and gas pipelines of catalytic cracking, hydrocracking, and delayed coking units. CF8C material resists high-temperature sulfide stress corrosion and hydrogen attack.
High-Temperature Chemical Plants: Used in high-temperature inlet and outlet lines of high-pressure reaction systems for ammonia, methanol, urea, etc. The Class 1500 rating meets the most demanding process isolation requirements.
Gas Turbine Power Generation: Installed in gas turbine exhaust and HRSG high-temperature flue gas pipelines, resisting high-temperature oxidation and corrosion.
Concentrated Solar Power (CSP): Applied in molten salt thermal storage and steam generation systems, withstanding high-temperature molten salt corrosion and thermal shock.
High-Temperature High-Pressure Test Equipment: Used in material test benches and pressure vessel test systems, with full certifications ensuring reliable test data.
Advantages & Value
High-Temperature Creep Resistance of CF8C: Niobium stabilization prevents chromium depletion at grain boundaries at elevated temperatures. Creep strength above 538℃ is 2–3 times that of 316, guaranteeing long-term safe operation in supercritical power generation and high-temperature chemical processes.
Ultra-High-Pressure & High-Temperature Reliability: Class 1500 rating and CF8C cast structure ensure structural integrity and sealing reliability at 25.5 MPa and 650℃, avoiding catastrophic failure.
Low Pressure Drop Straight-Through Flow Path: When fully open, the flow passage aligns with the pipe inner diameter, delivering minimal pressure drop, ideal for long-term full-open service with low pumping energy consumption.
Safety & Compliance Assurance: Multiple safety features including API 600 design, high-temperature packing, and blowout-proof stem. Optional PED and API 600 monogram certification meet the strictest high-temperature high-pressure safety codes.
Flexible Automation Upgrades: ISO 5211 standard mounting pad allows quick installation of various high-temperature actuators, facilitating upgrade from manual operation to remote control and automated systems.
System Integration Optimization: Standard face-to-face dimensions and flanged connections enable easy integration into existing high-temperature high-pressure piping systems, reducing engineering design and construction costs.
Sustainable Value: High-efficiency high-temperature design reduces energy loss; long service life lowers material consumption and waste, supporting low-carbon transition in the energy industry.
