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J-VALVES
Structural Features
LCC Low-Temperature Carbon Steel Material:The valve body is made of ASTM A352 LCC low-temperature carbon steel with strictly controlled chemical composition and low phosphorus and sulfur content. It fully passes -46℃ Charpy V-notch impact test (≥20J), guaranteeing excellent toughness and crack resistance at low temperatures and preventing cold brittleness fracture.
Right-Angle Flow Path Design:The inlet and outlet form a 90° angle (angle pattern), changing flow direction while fitting the layout of pipeline bends, reducing elbows and simplifying piping design. A Y-type inclined stem design is also available to lower flow resistance and improve flow capacity.
Globe Valve Regulation Characteristics:The disc lifts along the centerline of the seat with short opening/closing stroke. When closed, the disc and seat sealing surfaces fit tightly for reliable shut-off. When partially open, the annular orifice between disc and seat enables precise flow control, making it ideal for regulating service.
Flanged Connection:The valve body is equipped with RF (Raised Face) or RTJ (Ring Type Joint) flanges conforming to ASME B16.5 Class 600. For 12-inch Class 600 flanges: outer diameter 699mm, bolt circle diameter 615.9mm, 20×M36 bolts, flange thickness 81mm, ensuring reliable connection under high pressure.
Flat Face Sealing:Both disc and seat feature flat surfaces, easy to machine, suitable for general service conditions.
Conical Face Sealing:Tapered disc matches tapered seat with high specific sealing pressure, suitable for high-
pressure conditions.
Throttling Disc:Needle-type or parabolic disc head delivers superior regulation performance for precise flow control.
Low Operating Torque:The stem nut uses friction-reducing materials (copper alloy or self-lubricating composite) with precision machined threads to minimize lifting friction for easy manual operation. Gearboxes or electric actuators are optional for large sizes.
Fire-Safe Design:In compliance with API 607, graphite packing and metal sealing components maintain sealing integrity in fire scenarios, preventing secondary hazards caused by low-temperature medium leakage.
Blowout-Proof Stem:The stem is integrally forged and top-entry mounted with anti-blowout steps and sealing rings. Even if the packing gland accidentally loosens, the stem is retained by the bonnet for operational safety.
Graphite Packing Seal:The stuffing box uses flexible graphite braided packing or graphite ring assemblies. With a wide temperature range (-196℃ to +500℃), no hardening at low temperatures and excellent self-lubrication, ensuring long-term reliable dynamic stem sealing.
Guide Rib Design:Internal disc guide ribs are integrated in the valve body to ensure stable lifting without deflection, uniform loading on sealing surfaces, avoiding jamming and scoring, and extending service life.
Technical Parameters
Nominal Size: 12″ (DN300)
Pressure Class: 600LB (PN100)
Body Material: ASTM A352 LCC (low-temperature carbon steel, qualified for -46℃ impact test)
Temperature Range: -196℃ to +100℃
Body/Bonnet: ASTM A352 LCC
Disc: LCC + Stellite hardfacing / 13Cr stainless steel
Seat: LCC + Stellite hardfacing
Stem: A276 410 / 420 / 304 / 316 stainless steel, high strength and wear resistance
Packing: Flexible graphite braided packing / graphite rings / low-temperature special graphite
Gasket: Spiral-wound gasket (316L/flexible graphite) / RTJ gasket
Bolts: ASTM A320 L7 / L7M (low-temperature high-strength bolts, qualified for -100℃ impact test)
Nuts: ASTM A194 Gr.7 / 7M
End Connection: Flanged (RF / RTJ) to ASME B16.5 Class 600; BW (Butt Weld) ends optional
Flange Dimensions (ASME B16.5):OD 699mm, bolt circle 615.9mm, bolt hole 38mm, 20×M36 bolts, flange thickness 81mm, raised face height 7mm
Face-to-Face: ASME B16.10
Operation: Manual (handwheel/gearbox, standard), pneumatic (linear stroke), electric (multi-turn, on-off/regulating), hydraulic
Design Standards: ASME B16.34, API 602, BS 1873
Test Standard: API 598
Applications
LNG Facilities: Applied in -46℃+ low-temperature natural gas pretreatment, liquefaction and regasification pipelines in LNG plants and terminals for shut-off and flow regulation.
LPG Storage & Transportation: Used for low-temperature liquid hydrocarbon control in LPG pipelines, tanks and loading/unloading systems. LCC material withstands -46℃, ensuring reliable performance in cold regions.
Air Separation Plants: Suitable for low-temperature air, nitrogen and oxygen pipelines in large ASU units. Right-angle design optimizes layout for reliable control of large-bore low-temperature gases.
Low-Temperature Chemical Processes: Used in 12-inch process lines for ethylene, propylene, ammonia and other high-pressure low-temperature chemical plants for precise regulation and safe isolation.
Natural Gas Processing Plants: Applied in dehydration, dehydrocarbonization and desulfurization low-temperature units for flow and pressure control.
Refrigeration Systems: Used in large industrial refrigeration and cold storage systems for refrigerant flow control.
Advantages & Value
Guaranteed Low-Temperature Toughness: LCC material fully tested at -46℃ eliminates cold brittleness risks, ensuring safe control of LNG, LPG and other cryogenic media.
High-Pressure Reliability: 600LB (102bar) class meets high-pressure low-temperature conditions. 12-inch large bore supports high-flow delivery as key equipment for large cryogenic systems.
Space-Optimized Right-Angle Flow: 90° flow direction reduces pipe elbows, adapts to confined installation, lowers pressure loss and installation costs.
Precise Regulation: Globe valve structure provides linear or equal-percentage flow control, superior to gate valves, supporting automated process control.
Low-Temperature Bolt Compatibility: A320 L7/L7M bolts tested at -100℃ match LCC body, preventing flange leakage from bolt embrittlement.
Cost-Effective Maintenance: Bolted bonnet design allows online replacement of disc, seat and packing without cutting or welding, cutting maintenance time by 60% and minimizing downtime loss.
Flexible Actuation: Gearbox, pneumatic and electric actuators available, supporting 4-20mA/HART/Modbus protocols for easy integration into DCS/SCADA for remote monitoring and automatic control.
