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J-VALVES
Structural Features
Hydraulic Actuator Drive: Equipped with rack-and-pinion, scotch-yoke or helical hydraulic actuators. Operating pressure is typically 10~21 MPa (higher on request), with output torque up to hundreds of thousands of N·m, enabling fast opening and closing of large-bore high-pressure valves.
Trunnion Mounted Design: The ball is secured by upper and lower trunnions and does not float under medium pressure. Sealing is achieved via spring-loaded seats or piston effect, significantly reducing operating torque and ideal for high-pressure large-bore applications.
Flanged End Connections: RF, RTJ or BW ends complying with ASME B16.5/B16.25 for easy integration into large-scale piping systems. Lens gasket or oval gasket sealing is available for high-pressure services.
Double-Acting: Hydraulically driven for both opening and closing, featuring high output torque and precise control, suitable for frequent operation.
Single-Acting Spring Return: Opened by hydraulic power and closed by spring force in emergency; automatically shifts to safe position upon pressure loss, ideal for ESD emergency shutdown applications.
Fast Opening & Closing: Fast response of hydraulic system with adjustable full-stroke time of 1~30 seconds, meeting emergency shutdown requirements (typically <15 seconds).
Full Coverage for High Pressure & Large Bore: Sizes NPS 2″~60″, pressure classes Class 150~2500 (PN20~420), covering all requirements from standard to ultra-high-pressure services.
Modular Hydraulic Power System: Integrated with hydraulic power unit, accumulator, control valve manifold and filter, supporting local or remote control and SCADA/DCS integration.
Fail-Safe Design: Accumulator stores hydraulic energy to ensure valve moves to safe position during power or pressure loss; spring-return type automatically closes upon pressure failure.
Position Feedback & Monitoring: Fitted with valve position transmitter (4–20 mA), limit switches and pressure sensors for real-time monitoring of valve status and hydraulic system health.
Subsea/Underwater Capability: Optional subsea hydraulic actuators rated to water depths up to 3,000 meters, suitable for subsea pipelines and deepwater production systems.
Fire-Safe & Explosion-Proof Design: Actuator fire-safe certification conforming to API 6FA/6FB, explosion-proof rating Ex d IIB T4 or higher for hazardous areas.
Wide Material Selection: Body materials including WCB, CF8M, F51/F53 duplex stainless steel, Inconel, etc.; hardened ball and seat for corrosive, erosive and high-temperature services.
Technical Parameters
Size Range: NPS 2″ to 60″ (DN50 to DN1500)
Pressure Class: Class 150 to Class 2500 (PN20 to PN420); full API 6D series
Hydraulic System Pressure: 10 MPa, 16 MPa, 21 MPa (standard); up to 35 MPa (custom)
Temperature Range: -29℃ to +425℃
Body: WCB, CF8M, F316, F51/F53, Inconel 625
Ball: F316+ENP, F316+tungsten carbide, Inconel 625+tungsten carbide
Seat: RPTFE, Devlon, PEEK, SS316+graphite, tungsten carbide
Trunnion/Bearing: SS316, 17-4PH, Inconel 718, tungsten carbide coating
Actuator Cylinder: Carbon steel, stainless steel, aluminum alloy (lightweight)
Hydraulic Fluid: Mineral oil, water-glycol (fire-resistant), synthetic ester (environmentally biodegradable)
End Connections: RF, RTJ, BW complying with ASME B16.5/B16.25; API 6D pipeline valve ends
Design Standards: API 6D, API 608, ASME B16.34
Testing Standards: API 6D, API 598
Applications
ESD for Natural Gas Long-Distance Pipelines: Line Shutoff Valves (LSV) in compressor stations, metering stations and valve rooms, providing emergency shutdown within <15 seconds upon pressure loss, fire or leakage.
Key Systems on Offshore Platforms: Main oil/gas export, water injection and gas injection pipelines on wellhead and production platforms, with hydraulic actuation adapted to marine environments.
Subsea Pipelines & Deepwater Systems: Remote hydraulic control for Subsea Production Systems (SPS), Subsea Manifolds (PLEM) and riser bases, operating at water depths up to 3,000 meters.
Large Gas Storage Facilities: Fast switching and emergency isolation at injection/production wells and gathering stations, with large-bore high-pressure fast response.
High-Pressure Petrochemical Units: Inlet and outlet of large reactors in hydrocracking and catalytic cracking units for high-frequency operation and emergency shutdown.
LNG Terminals: Large-bore cryogenic valves for high-pressure export and regasification systems, with cryogenic hydraulic actuators ensuring reliable operation at -162℃.
Single Point Mooring (SPM/SBM) for Crude Oil Export: Large-bore swivel joint valves at offshore loading terminals, with hydraulic actuation adapted to dynamic sea conditions.
Advantages & Values
Maximum Output Torque: Hydraulic actuators deliver the highest torque per unit weight, easily driving ultra-high-pressure large-bore valves up to 60″/Class 2500, unmatched by electric and pneumatic actuators.
Fastest Response Speed: Hydraulic system response time <100 ms, full stroke in 1~15 seconds, meeting the strictest ESD emergency shutdown requirements.
Highest Control Accuracy: Hydraulic servo system enables valve opening regulation with 0.1% precision, suitable for throttling control and pressure/flow regulating loops.
Inherent Fail-Safe: Accumulator energy storage plus spring return design ensures automatic safe position on power loss, pressure loss or signal failure, with safety integrity up to SIL 3.
Subsea/Deepwater Adaptability: Subsea hydraulic actuators rated to 3,000 meters water depth, the only feasible valve drive solution for deepwater oil and gas development.
Long Maintenance-Free Period: Mature hydraulic system sealing technology, typically 5~10 years maintenance-free, with 25-year design life for subsea systems.
