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J-VALVES
Design Features
Extra-Large Bore & Ultra-High Pressure Rating: Designed with a 24-inch (DN600) large bore and Class 1500 (PN260) ultra-high pressure rating to meet shutoff requirements for high-flow, ultra-high pressure mainline systems. Wall thickness, bolting and sealing structures are engineered for the most severe operating conditions.
Wedge-Type Flexible Wedge: The gate features a one-piece flexible wedge design with precision-machined wedge angle, ensuring reliable sealing through matched wedge faces between the body and seat. The flexible structure compensates for thermal deformation caused by temperature variations, maintaining sealing performance at ultra-high temperatures. Guide ribs on the gate ensure accurate alignment during opening and closing.
Pressure-Operated Self-Sealing Bonnet: Equipped with a pressure seal bonnet design, delivering enhanced sealing reliability with increasing medium pressure, ideal for ultra-high pressure applications. The bonnet and body are sealed with octagonal metal ring gaskets or lens gaskets for exceptional sealing performance.
Electric Actuator Operation: Fitted with high-torque intelligent multi-turn electric actuators.
Outside Screw & Yoke (OS&Y) Design: The valve stem threads are located outside the valve body, fully isolated from the process medium. A heavy-duty yoke supports the stem nut for stable operating torque, enabling clear visual indication of valve position, in compliance with API 600 standards.
Fire-Safe Design: Compliant with API 607 standards. The metal-to-metal sealing structure maintains sealing integrity under fire conditions to prevent medium leakage.
Blowout-Proof Stem Design: The stem features a top-entry anti-blowout construction with multiple shoulders and retaining rings, preventing stem ejection under abnormal overpressure conditions and ensuring operational safety.
Back Seat Design: When fully open, a metal seal forms between the stem and bonnet, allowing online packing replacement without system depressurization.
Flexible Graphite Packing: High-purity flexible graphite packing is applied, offering a wide temperature range (-200℃ to +600℃), excellent self-lubrication and superior sealing. A packing lubrication device can be equipped for emergency sealing.
Technical Parameters
Nominal Size: 24" (DN600)
Pressure Class: Class 1500 (PN260)
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A182 F92, A217 C12A (upgrade of WC9), A335 P92
Gate: F92 with STL6 hardfacing, F92 with nickel-based alloy hardfacing, solid carbide
Seat: F92 with STL6 hardfacing, F92 with nickel-based alloy hardfacing, replaceable carbide seat
Stem: F92, Inconel 718, XM-19 (Nitronic 50), C-276
Bellows/Packing: Flexible graphite, graphite with nickel wire reinforcement, Inconel 718 bellows (special version)
Gaskets: Octagonal/oval metal ring gaskets (BX/RX type, F92/304/316), lens gaskets, pressure self-sealing rings
Bolts/Nuts: ASTM A193 B16/B8M, A194 Gr.4/Gr.8M (high-temperature alloy steel)
End Connections: Flanged (RF/RTJ, ASME B16.5), Butt-Welded (BW, ASME B16.25)
Operation: Electric (intelligent multi-turn, standard), Pneumatic (high-torque scotch yoke type), Hydraulic,
Manual (heavy-duty gearbox, emergency backup)
Design Standard: API 600, ASME B16.34
Test Standard: API 598
Application Areas
Large-Scale Chemical Plants: Used for inlet and outlet isolation of high-temperature and high-pressure reactors, heat exchangers and separators in ethylene cracking, ammonia synthesis, methanol-to-olefins (MTO) and other units.
Petrochemical Hydroprocessing: Applied in high-temperature and high-pressure hydrogen and oil-gas systems of hydrocracking and hydrotreating units, resisting hydrogen-induced corrosion.
Metallurgical High-Temperature Gas: Used for high-temperature and high-pressure gas shutoff in blast furnace top gas recovery turbine (TRT) and coke dry quenching systems.
Large-Scale Heating Networks: Employed for high-temperature and high-pressure steam mainline shutoff in cogeneration and district energy stations, ensuring safe urban energy supply.
General Industrial Service: Suitable for reliable isolation of any large-bore, ultra-high temperature and ultra-high pressure media, serving as the ultimate safety safeguard for extreme-condition pipelines.
Advantages & Value
Extreme High-Temperature & Ultra-High Pressure Adaptability: F92 alloy provides creep rupture strength exceeding 100 MPa at 625℃ for 100,000 hours. Combined with Class 1500 rating, it is engineered for ultra-supercritical and the harshest service conditions.
Large-Bore High-Flow Capacity: 24-inch large bore satisfies high-flow mainline requirements, reducing system pressure drop and improving energy efficiency.
Reliable Intelligent Electric Control: High-torque intelligent electric actuators enable remote precise control, condition monitoring and fault diagnosis, minimizing manual operation risks and enhancing automation and response speed.
Superior Ultra-High Pressure Sealing: Pressure seal bonnet design delivers increasingly reliable sealing with rising medium pressure. Metal ring gaskets resist thermal shock, ensuring long-term dependable sealing at ultra-high temperatures and pressures.
Multi-Layer Operational Safety: OS&Y design provides clear stem position visibility. Anti-blowout, back seat, torque protection and overheating protection features ensure safe operation and equipment protection.
Long Service Life & Low Maintenance: Excellent high-temperature creep properties of F92 reduce thermal deformation and stress relaxation. Wear-resistant carbide sealing surfaces extend service life and lower lifecycle costs.
Wide Application Versatility: Multiple heat-resistant steel grades (F92/F91/C12A) and sealing configurations are available, covering extreme conditions from ambient temperature up to 705℃ and from low to ultra-high pressure.
International Standard Compliance: Designed and manufactured strictly in accordance with API 600, ASME, EN, IEC and other international standards, meeting procurement requirements for global ultra-supercritical projects. Complete documentation is supplied including material certification (EN 10204 3.1/3.2), high-temperature creep test reports, metallographic analysis reports, non-destructive test reports, SIL certification and explosion-proof certification.
