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J-VALVES
Structural Features
Cast Valve Body Foundation: Precision cast from materials including ASTM A216 WCB, A352 LCB/LCC (low temperature), A351 CF8/CF8M (stainless steel), offering excellent formability for complex flow path designs and cost efficiency.
Fully Welded Integrated Structure: Valve body and end connectors (pup pieces or flange necks) are joined by full-circumference automatic welding (GMAW/SAW), forming a fully enclosed metal cavity. No gaskets, bolts or flange gaps exist, fundamentally eliminating external leakage points.
No Mid-body Flange: The conventional body-bonnet flange connection is eliminated. The stem is inserted directly into the welded body from the top, with the stuffing box fully welded or thread-welded to the body, further reducing potential leakage paths.
Buried & Maintenance-Free Design: The fully welded structure eliminates the need for periodic bolt retightening or gasket replacement. With a design life of 30–50 years, matching the pipeline service life, it is ideal for buried, subsea, tunnel and other inaccessible locations.
Floating Ball (Typically ≤ DN200): Simple structure, pressure-assisted sealing, economical and reliable.
Trunnion Mounted Ball (≥ DN200 or High Pressure): Supported by trunnions, low operating torque, suitable for high-pressure and large-bore applications.
Full Bore or Reduced Bore: Full bore design provides nearly zero flow resistance and allows pig passage, suitable for long-distance pipelines; reduced bore lowers costs for general service.
Top Entry Design: A removable bonnet is installed on the top of the body, allowing on-line replacement of ball and seats without cutting or rewelding pipelines, achieving serviceability under the maintenance-free concept.
Stem Extension & Buried Adaptation: The stem can be welded and extended above ground, equipped with ground operating boxes or remote actuators to enable ground operation and monitoring of buried valves.
Anti-static & Fire-safe Design: Conductive connection between stem, ball and body; metal-to-metal contact in case of fire, complying with API 607 / ISO 10497 fire-safe requirements.
Stress Relief & Anti-corrosion: Overall post-weld heat treatment to remove residual stress; surface sandblasting followed by epoxy powder coating or 3PE anti-corrosion coating for buried corrosive environments.
Optional Intelligent Monitoring Ports: Equipped with drain ports, grease injection ports, and pressure/temperature sensor ports, supporting SCADA/IoT-based intelligent pipeline management systems.
Technical Parameters
Size Range: NPS 2″ to 60″ (DN50 to DN1500)
Pressure Class: Class 150 to Class 900 (PN20 to PN150); commonly Class 300/600 (PN50/100)
Face-to-Face: Conforms to ASME B16.10 or API 6D special lengths; customizable for fully welded structures
Temperature Range: -29℃ to +425℃
Body / End Pup Pieces: WCB, LCB, LCC, CF8, CF8M, CF3M
Ball: WCB + ENP, SS304, SS316, F304, F316
Seat: RPTFE, PTFE, Devlon, PEEK, SS304/316 + graphite (metal seated)
Stem: SS304, SS316, 17-4PH
Packing: Flexible graphite, braided graphite
Welding Consumables: ER70S (carbon steel), ER308L/316L (stainless steel), conforming to ASME IX
End Connection: BW (butt-welded, fully welded to pipeline); transition pup pieces available for various materials and wall thicknesses
Operation: Extended stem with handwheel/lever, pneumatic (ground-mounted), electric (ground-mounted), pneumatic-hydraulic (ESD), remote control
Design Standards: API 6D, ASME B16.34
Testing Standards: API 6D, API 598
Applications
Long-Distance Natural Gas Pipelines: Mainline block valves, Line Shutoff Valves (LSV), station inlet/outlet valves. Buried maintenance-free design ensures trouble-free operation for 30 years.
District Heating Networks: Large isolation valves for hot water and steam networks. Fully welded structure provides excellent thermal insulation, low heat loss, and safe, neat buried installation.
Subsea & Crossing Pipelines: Valves for river, lake and strait crossing sections. Fully welded structure ensures waterproof sealing with no subsea maintenance required.
LNG Terminals & Gas Storage Facilities: Critical isolation in BOG and export systems; low-temperature alloy steel meets requirements down to -46℃.
Refining & Petrochemical Internal Pipe Networks: Safe isolation of flammable and explosive media. Zero external leakage design complies with the strictest environmental and safety regulations.
Advantages & Values
Inherently Safe with Zero External Leakage: Fully welded structure completely eliminates all external leakage paths including gaskets, bolts and flanges. Environmental and safety performance far exceeds conventional flanged valves, meeting the strictest emission standards.
Compact & Lightweight: Eliminating flanges and bolts reduces overall length and weight by 30–40% compared to equivalent flanged valves, lowering transportation and installation costs.
Matching Pipeline Service Life: Welded joints possess strength equal to the pipeline, with matching fatigue life; no need for periodic replacement as a wearing component.
Post-Fire Integrity: All-metal construction contains no combustible components, retaining functionality after fire events and satisfying API 607/6FA requirements.
Ready for Smart Pipelines: Can integrate pressure, temperature and vibration sensors, supporting digital twin and predictive maintenance as infrastructure for intelligent pipeline networks.
