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J-VALVES
Design Features
Fully Welded Forged Steel Construction: The valve body is integrally welded from forged pipe sections and forged ends, without body flanges or bolted connections, completely eliminating external body leakage. Maintenance-free design with a service life of over 50 years.
Gas-Hydraulic Actuator: Powered by pipeline natural gas or high-pressure nitrogen, hydraulic actuation is achieved via gas‑liquid pressure boosting without external power. Explosion-proof rating up to Ex d IIC T6, suitable for Zone 1/2 hazardous areas.
Trunnion-Mounted Ball Design: The ball is precisely supported by upper and lower trunnions, achieving sealing independent of media pressure. Operating torque is low and consistent, ensuring flexible opening and closing even in high-pressure, large-size applications.
Double Piston Effect (DPE) Seats: Bi-directional sealing design. Seats automatically clamp onto the ball in case of abnormal cavity pressure buildup to prevent overpressure, supporting DBB (Double Block & Bleed) function.
Full Bore Design: Flow bore matches pipeline inner diameter with nearly zero pressure drop. Allows unrestricted passage of pigs and intelligent inspection devices, reducing pipeline maintenance costs.
Suitable for Buried or Subsea Installation: Fully welded structure with no external leakage points enables direct buried or subsea mounting without valve pits or waterproof seals, greatly reducing civil engineering costs.
ESD Emergency Shutdown: Supports remote ESD signals (hardwired/wireless), accepting commands from station control systems or leak detection systems for emergency safety shutdown.
Valve Position Monitoring & Feedback: Standard configuration includes valve position indicator, 4‑20 mA valve position transmitter, and full-open/full-closed limit switches for remote position monitoring and status feedback.
Low-Torque Optimized Design: Trunnion support and low-friction seats minimize operating torque. Optimized gas-hydraulic actuator selection reduces air consumption.
Technical Specifications
Size Range: 6″ to 56″ (DN150 to DN1400)
Pressure Class: 150LB to 2500LB (PN20 to PN420)
Temperature Range: -29℃ to +425℃
Body/Ends: ASTM A105 (carbon steel), A350 LF2 (low-temperature steel), A694 F52/F65 (high-strength pipeline steel), A182 F316 (stainless steel)
Ball: A105 with ENP / hard chrome / tungsten carbide coating; or solid F316
Trunnion/Support: A105 with surface hardening or 17‑4PH stainless steel
Stem: 17‑4PH or Inconel 718
Seat Sealing: PTFE/RPTFE (-46℃~180℃); PEEK (-60℃~260℃); metal seal + flexible graphite (-46℃~650℃)
Packing: Flexible graphite reinforced with Inconel wire
Welding Material: ER70S/GMAW/SAW compatible with base metal, 100% radiographic testing (RT)
End Connection: Full welded BW ends (ASME B16.25 / API 5L matched); optional flange transition ends
Actuation: Gas‑Hydraulic (primary); optional pneumatic, electric, electro‑hydraulic
Air Supply Pressure: 0.5~1.0 MPa (pipeline natural gas or nitrogen)
Operating Time: Fully open/close adjustable 5~30 seconds; emergency shutdown <10 seconds
Design Standard: API 6D, ASME B16.34
Testing Standard: API 6D, API 598
Face-to-Face Dimension: ASME B16.10
Applications
Long-Distance Natural Gas Transmission Pipelines: Mainline block valves for national strategic and cross-border pipelines, ESD emergency shutdown at unattended stations.
High-Pressure Gathering & Transportation Networks: Main gathering lines in oil and gas fields, inlet/outlet valves for processing plants, automatic linebreak protection.
Underground Gas Storage: Fully welded buried valves for injection/production wells, observation wells and balancing pipelines, maintenance-free for underground environments.
Subsea Pipelines: Valves for subsea pipelines connecting offshore platforms to onshore terminals, fully welded structure resistant to seawater corrosion and external high pressure.
LNG Terminals: Fully welded shutdown valves for high-pressure export, subcooling and BOG systems at low or ambient temperatures.
Advantages & Value
Intrinsic Safety with Zero External Leakage: Fully welded structure eliminates flange and bolt leakage risks. Zero probability of external body leakage within the 50‑year design life, making it the only choice for areas with the strictest environmental and safety regulations.
Operation Without External Power: Gas‑hydraulic actuation uses pipeline gas as energy source, independent of electricity supply. Excellent explosion-proof performance provides irreplaceable suitability for unattended stations and hazardous areas.
Superior Operating Performance: Gas‑hydraulic actuator delivers high and stable torque, enabling fast operation even for large, high-pressure valves, with energy savings of over 30% compared to pure pneumatic actuators.
Comprehensive Safety & Compliance: Complies with API 6D, ISO 14313, IEC 61508 and other standards. SIL 3 certification available, meeting project qualification and insurance requirements in major global markets.
Intelligent Expansion Capability: Can integrate wireless valve position monitoring, online diagnostics, predictive maintenance systems, supporting digital twin and Industrial Internet of Things (IIoT) applications.
