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J-VALVES
Structural Features
Fully Welded Structure: The valve body is connected to the pipeline by butt-welded (BW) full penetration welding, without flange sealing faces or bolted connections, completely eliminating external leakage risks. Featuring a compact and lightweight design, it reduces weight by approximately 30%~40% compared with flanged valves. It can be directly buried or surface‑mounted, and is maintenance‑free for its entire service life.
Trunnion Mounted Design: The ball is supported and fixed by upper and lower trunnions. Initial sealing is achieved via preloaded seat springs, with medium pressure assisting in enhancing sealing performance. It features low operating torque, suitable for high‑pressure and large‑bore applications, preventing excessive displacement of the ball caused by pressure differential that could lead to seal failure, ensuring accurate and smooth actuation by the electric actuator for precise position control.
Power Supply: Three-phase / single-phase AC power (380V / 220V / 24V) or DC power, suitable for stations with stable power supply and surface‑mounted installations.
Control Accuracy: On/off type or modulating type (4–20 mA / 0–10V proportional control) for precise opening adjustment.
Stroke Control: Dual protection with mechanical limit + electronic limit to accurately control valve opening and avoid over‑travel.
Status Feedback: Open/close/fault feedback signals as standard; valve position transmitter (4–20 mA) is optional for real‑time valve position feedback.
Protection Functions: Over‑torque protection, overheating protection, phase‑loss protection, water and dust proof (IP67/IP68), heating and dehumidification, lightning protection.
Manual Override: Equipped with a handwheel or crank handle for emergency manual operation in case of power failure.
Smart Diagnostics: Optional intelligent valve controller for partial stroke test (PST), fault prediction, and operational data logging.
Full Bore Design: The flow passage diameter matches the pipeline inner diameter, resulting in extremely low pressure drop and allowing smooth passage of pipeline pigs, meeting the requirements of pigging and inspection for long‑distance pipelines.
Buried / Surface‑Mount Adaptability: The fully welded structure has no external leakage points and can be directly buried without valve pits or with greatly reduced pit size. The electric actuator has a high protection grade, adapting to harsh outdoor environments. Extended stem and top protective tube are optional for ground operation.
Wide Range of Body Materials: A105N, F304, F316, LF2, etc., covering a wide range of working conditions from ambient to low temperature, non‑corrosive to highly corrosive media.
Soft Seats: PTFE, RPTFE, PPL, suitable for ambient temperature applications with strict sealing requirements.
Metal Seats: Hardfaced with Stellite alloy or nickel‑base alloy, suitable for high‑temperature, high‑pressure, and particle‑containing media.
Fire‑Safe Design: Complies with API 6FA standard. In case of fire, metal seals and graphite packing maintain sealing performance to prevent catastrophic leakage.
Anti‑Static Device: Built‑in anti‑static spring and conductor ensure electrical continuity between the ball, stem, and body, preventing electrostatic accumulation that may cause explosion hazards.
Blowout‑Proof Stem: The stem adopts a top‑entry blowout‑proof structure to ensure operational safety under high pressure.
Emergency Seal Lubrication System: Grease injection ports are provided at the seat area. Sealant can be injected in emergencies to restore sealing performance and extend the emergency response window.
Drain and Vent Connections: A drain port at the bottom and a vent port at the top of the valve body facilitate cavity maintenance, drainage, and pressure relief.
Technical Parameters
Size Range: 2″ ~ 56″ (DN50 ~ DN1400)
Pressure Class: Class 150 ~ Class 2500 (PN20 ~ PN420)
Temperature Range: -29℃ to +425℃
Body: ASTM A105N / A350 LF2 (carbon steel, low‑temperature type), ASTM A182 F304/F316 (stainless steel)
Ball: A105N/F304/F316 + Stellite hardfacing, tungsten carbide coating
Seat: A105N/F304/F316 + Stellite hardfacing, Inconel hardfacing
Stem: F316 / 17‑4PH / Inconel 718
Sealing Materials: PTFE, RPTFE, PPL, metal hard seal (Stellite, tungsten carbide, nickel‑base alloy)
Packing: Flexible graphite, braided graphite reinforced with Inconel wire
Welded Ends: Comply with ASME B16.25 / API 6D
End Connection: Butt‑welded (BW), fully welded structure, conforming to ASME B16.25 / API 6D
Operation: Electric (standard), manual override mechanism optional
Power Supply: Three‑phase 380V AC / Single‑phase 220V AC / 24V DC (optional)
Control Type: On/off (S2/S5 duty) / Modulating (4–20 mA / 0–10V)
Output Torque: Configured per valve torque calculation, typically 2000 ~ 50000 Nm (for large‑bore high‑pressure applications)
Stroke Time: 30 ~ 300 seconds (adjustable, depending on size and pressure class)
Protection Class: IP67 / IP68 (submersible type optional)
Explosion Protection Class: Ex d IIB T4 / Ex d IIC T6 (explosion‑proof type optional)
Communication Protocols: Modbus RTU/TCP, Profibus DP/PA, HART, Foundation Fieldbus
Protection Functions: Over‑torque protection, overheating protection, phase‑loss protection, water & dust proof, heating & dehumidification, lightning protection
Position Feedback: On/off type (open/close/fault dry contacts), modulating type (4–20 mA position feedback)
Handwheel Override: Standard mechanical handwheel for local emergency operation during power failure
Design Standard: API 6D, ASME B16.34
Test Standard: API 6D, API 598
Face‑to‑Face Dimension: Complies with ASME B16.10
Applications
Natural Gas Long‑Distance Pipelines: Used at key nodes including trunk lines, branch lines, compressor stations, metering and regulating stations, pigging stations, and block valve chambers, enabling precise remote control, automatic regulation, and SCADA integration.
District Heating Networks: Applied in primary trunk lines of cogeneration and central heating systems, with high temperature and pressure resistance and zero external leakage. Electric modulation achieves accurate temperature control.
Gas Storage and LNG Terminals: Used in gas injection, production, and export pipelines, with electric actuators providing precise flow control to meet automated dispatch requirements.
Oil Transmission Pipelines: Applied in crude oil and refined product long‑distance pipelines and stations, satisfying pigging, metering, and distribution processes.
Chemical and Petrochemical: Used in buried or surface pipelines conveying high‑pressure flammable, toxic, and corrosive media, with electric control ensuring safe operation and precise regulation in hazardous areas.
Water Treatment and Pumping Stations: Provides reliable isolation and precise flow control for large‑bore raw water transmission, wastewater treatment, and pumping station piping systems.
General Industrial Service: Suitable for reliable isolation and regulating control of large‑bore medium‑to‑high‑pressure water, oil, gas, and other media requiring remote monitoring, precise control, zero leakage, and maintenance‑free operation.
Advantages and Values
Zero External Leakage & High Reliability: The fully welded structure completely eliminates leakage risks at body‑pipeline joints. It is maintenance‑free for its entire service life when buried or surface‑mounted, significantly reducing environmental risks and maintenance costs.
Precise Intelligent Control: Electric actuators support proportional regulation, position feedback, and multiple communication protocols. Integration with SCADA systems enables remote monitoring, fault diagnosis, and predictive maintenance, improving pipeline network intelligence.
Smooth Operation in Large Bores: The trunnion‑mounted design significantly reduces operating torque under high‑pressure large‑bore conditions. The electric actuator accurately controls opening to avoid water hammer and surge, achieving smooth regulation.
All‑Weather Operational Capability: High protection class (IP67/IP68) and explosion‑proof options adapt to harsh outdoor environments, humidity, dust, and explosive gas atmospheres.
Emergency Operation Assurance: Handwheel override allows local emergency operation during power failure. With UPS or backup power, valve controllability is ensured under critical conditions.
High Pig Compatibility: Full bore design allows unobstructed passage of pipeline pigs, supporting in‑line inspection and cleaning to improve pipeline operation and maintenance efficiency.
Comprehensive Safety Compliance: API 6D design, DBB function, fire‑safe, anti‑static, blowout‑proof, over‑torque protection, and intelligent diagnostics meet stringent international safety standards for long‑distance and urban gas pipelines.
Strong Digital Compatibility: Supports Industry 4.0 digital upgrading, enabling real‑time valve status monitoring, cloud‑based operational data analysis, predictive maintenance, and full lifecycle management.
