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J-VALVES
Design Features
High-Temperature Alloy Construction: Valve body and bonnet are forged from high-temperature alloy steels such as ASTM A182 F91/F92, F11/F22, Inconel alloys, featuring excellent high-temperature creep strength, oxidation resistance and microstructural stability to meet ultra-supercritical service requirements above 620℃.
Pressure-Operated Self-Sealing Bonnet: Equipped with lens gasket, triangular gasket or Ω-ring self-sealing structure. The sealing performance improves with increasing medium pressure, completely eliminating risks of high-temperature relaxation and leakage from conventional flange bolts, suitable for Class 1500 and higher pressure ratings.
Flexible Wedge Design: The integral wedge is machined with a flexible slot in the middle, achieving self-energized sealing under medium pressure, automatically compensating for thermal deformation and sealing surface wear caused by high temperatures to ensure long-term reliable shut-off.
Hardfaced Carbide Sealing Surfaces: Seat and wedge sealing surfaces are hardfaced with Stellite alloy or made of solid carbide, resistant to high-temperature erosion, cavitation and wear, with hardness exceeding HRC 40.
Fully Guided Structure: The wedge is fitted with upper and lower guide rails and guide sleeves, ensuring stable alignment during opening and closing under high-temperature and high-pressure conditions, preventing jamming and vibration, and reducing operating torque.
Extended Heat-Dissipating Bonnet: The bonnet adopts an extended neck design to keep the packing chamber away from high-temperature media. Combined with cooling fins, it lowers packing temperature, preserving sealing performance and operational safety.
Low-Friction High-Temperature Packing: Flexible graphite, graphite braided with Inconel wire, or high-temperature ceramic fiber packing is used, with temperature resistance up to 650℃ and above. Paired with a live-loaded packing gland, it delivers reliable dynamic sealing.
Blowout-Proof Stem & Back Seat: The stem is designed with an anti-blowout shoulder at the bottom. In the fully open position, it forms a metal-to-metal seal with the bonnet back seat, allowing online packing replacement under pressure in compliance with high-temperature and high-pressure valve safety standards.
Bypass & Pressure Balancing: Large-bore high-pressure models are equipped with bypass valves or wedge pressure balancing holes to equalize differential pressure across the valve, enabling low-torque operation and protecting sealing surfaces.
Multiple Actuation Options: Standard with impact handwheel or sprocket. Large-bore high-pressure versions can be fitted with electric, pneumatic or hydraulic actuators for remote control and quick response.
Technical Specifications
Size Range: NPS 2″ to 48″ (DN50 to DN1200)
Pressure Class: Class 600 to Class 4500 (PN100 to PN760)
Temperature Range: -29℃ to +650℃
Body/Bonnet: ASTM A182 F11, F22, F91, F92, F316, Inconel 740H
Wedge: F91/F92 with Stellite overlay, solid carbide, C12A martensitic steel
Stem: F6a, 17-4PH, Inconel 718, GH4169 (high-temperature alloy)
Seat: Body with Stellite overlay, renewable seat rings
Self-Sealing Elements: Mild steel, stainless steel, Inconel alloy lens gaskets or Ω-rings
Packing: Flexible graphite, graphite with Inconel wire, high-temperature ceramic fiber
End Connections: Butt-Weld (BW), Flanged (RTJ ring-type joint), conforming to ASME B16.25/B16.5
Operation: Manual (impact handwheel / sprocket), electric, pneumatic, hydraulic, electro-hydraulic
Design Standards: ASME B16.34, API 600, API 602
Testing Standard: API 598
Applications
Petrochemical Industry: Shut-off service for high-temperature, high-pressure hydrogen and hydrocarbon media in hydrocracking, catalytic reforming and ethylene cracking units.
Coal Chemical Industry: Control of high-temperature, high-pressure syngas and black water in coal gasification, coal-to-liquid and coal-to-natural gas plants.
CCGT Power Plants: Quick shut-off for high-pressure steam systems of heat recovery steam generators (HRSG) and fuel systems of gas turbines.
Industrial Boilers: Safety isolation for steam and feedwater systems of high-pressure utility boilers and industrial boilers.
New Energy & Energy Storage: High-temperature and high-pressure media control in molten salt systems for CSP plants and compressed air energy storage systems.
Advantages & Value
Extreme Condition Adaptability: High-temperature alloy materials and self-sealing structure break through temperature and pressure limits of conventional valves, meeting stringent parameters of ultra-supercritical power units.
Zero-Leakage Reliability: Self-sealing performance strengthens automatically with medium pressure, combined with self-compensating flexible wedge, completely eliminating external and internal leakage risks under high-temperature and high-pressure conditions.
Long-Term Operational Stability: Carbide sealing surfaces and fully guided structure ensure maintenance-free operation for more than 30 years under high-temperature and high-differential-pressure conditions.
Maintenance Safety: Back seat design allows online packing replacement without system shutdown, greatly reducing maintenance costs and safety risks.
International Standard Compliance: Strictly manufactured in accordance with ASME, API, BS and power industry standards, meeting global energy project access and certification requirements.
Intelligent Upgradeability: Can be equipped with high-temperature and high-pressure sensors, online monitoring systems and smart actuators to support digital power plants and predictive maintenance.
