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J-VALVES
Construction Features
A105N Normalized Forged Carbon Steel Material:The valve body is made of ASTM A105N forged steel. After normalizing heat treatment, the grain structure is refined and homogenized, improving low-temperature impact toughness by more than 30% compared with conventional A105. It satisfies service conditions from -29℃ to -46℃ and eliminates the risk of low-temperature brittle fracture.
Full Forged Structure:The valve body is integrally machined from forgings with dense grains and free of casting defects. Its pressure-bearing capacity and fatigue life are significantly superior to cast valves, making it especially suitable for 600LB medium-to-high pressure pulsating service.
Double Block & Bleed (DBB) Function:Equipped with two independent seats for bi-directional bubble-tight shut-off. A bleed/drain valve is provided in the valve body cavity, enabling online cavity pressure relief and seal integrity testing. It meets API 6D isolation requirements and prevents abnormal overpressure in the valve cavity.
Flanged or Butt-Weld End Connections:Adopts RF (Raised Face) flanges per ASME B16.5 or BW butt-weld ends per ASME B16.25. The connections feature high strength and reliable sealing under 600LB class pressure, adapting to various piping system requirements.
Fire-Safe Design:In compliance with API 607. In case of PTFE/RPTFE seal burnout, a secondary metal seal is formed between the metal ball and metal seat ring to prevent media leakage under fire conditions.
Anti-Static Device:Conductive springs are installed between the stem, ball and valve body to ensure continuous static dissipation, suitable for flammable and explosive media such as natural gas and crude oil.
Blowout-Proof Stem Design:The stem is designed with a bottom shoulder to prevent stem ejection under abnormal 600LB high-pressure conditions, ensuring personnel and equipment safety.
Emergency Seal Lubrication System:Lubrication injection valves are standard in the seat and stem areas. In emergency situations, sealant can be injected to restore temporary sealing and allow safe maintenance.
Compact and Lightweight:The 6-inch medium-to-high pressure design features moderate dimensions and controllable weight, facilitating installation and integration into skid-mounted equipment and station process modules.
Technical Parameters
Nominal Size: 6″ (DN150)
Pressure Class: 600LB (PN100)
Temperature Range: -29℃ to +425℃
Valve Body/Bonnet: ASTM A105N (normalized forged carbon steel); optional A350 LF2 (-46℃ low-temperature steel) or A182 F316 (stainless steel upgrade)
Ball: A105N + ENP (electroless nickel plating) / hard chrome plating / stainless steel hardfacing
Stem: A105N + ENP, 17-4PH precipitation hardening stainless steel or SUS420
Seat Seal:PTFE/RPTFE (-29℃ ~ 180℃).PPL (-29℃ ~ 280℃).PEEK (-60℃ ~ 260℃).Metal seal + flexible graphite (-29℃ ~ 425℃)
Packing: Flexible graphite reinforced with Inconel wire, or PTFE V-rings
Gasket: Flexible graphite stainless steel spiral wound gasket or metal ring gasket (octagonal / oval)
Bolting: ASTM A193 B7/B7M (alloy steel) or B8M (stainless steel) with A194 2H/2HM/8M nuts
End Connection: Flanged (RF, ASME B16.5); Butt-weld (BW, ASME B16.25, preferred per API 6D)
Operation: Manual (lever with locking device); optional worm gear box, pneumatic (single/double acting), electric, and pneumatic-hydraulic actuator
Design Standards: ASME B16.34, API 6D, API 608
Inspection & Testing Standards: API 598, API 6D
DBB Certification: Complies with API 6D Annex H and ISO 14313 DBB requirements
Face-to-Face Dimension: ASME B16.10
Applications
Oil & Gas Fields in Cold Regions:Wellheads, metering stations and gathering stations in northern and high-latitude oil and gas fields. A105N low-temperature toughness prevents brittle fracture in winter.
Natural Gas Processing, Storage & Transportation:Inlet and outlet valves for city gate stations, pressure regulating stations and gas storage caverns. DBB function supports online seal testing and valve cavity pressure relief.
Low-Temperature Chemical Processes:Low-temperature isolation above -29℃ in air separation units, low-temperature methanol washing, and CO₂ liquefaction systems.
Oil Storage & Transportation Facilities:Receiving, dispatching, tank switching and truck/ship loading/unloading valves for crude oil and refined product tank farms. DBB function ensures operational safety.
Coal Chemical and Ammonia Synthesis:Isolation and switching in medium-to-high pressure process pipelines. A105N strength meets syngas and hydrogen service conditions.
Advantages & Value
Guaranteed Low-Temperature Toughness:Normalized A105N with refined grain structure improves low-temperature impact energy at -29℃ by over 30% compared to A105. It eliminates brittle fracture in cold regions and intermittent low-temperature service, avoiding major safety incidents.
DBB Safety Assurance:Independent dual-seat sealing plus cavity bleeding enable online seal verification and safe pressure relief. It meets the strictest process isolation and safety specifications, preventing seal failure caused by abnormal cavity overpressure.
Balanced Economy and Reliability:A105N material costs significantly less than stainless steel, with an excellent balance of strength and toughness at 600LB class, making it a cost-effective solution for low-temperature applications.
Easy and Flexible Operation:Floating ball design is simple and smooth-running with moderate operating torque at 6-inch size via lever. Pneumatic/electric actuation can be easily upgraded for compatibility with SCADA and DCS systems.
