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J-VALVES
Design Features
F51 Duplex Stainless Steel Material: The valve body is forged from ASTM A182 F51 (2205/S32205) with a PREN value ≥ 35, delivering excellent resistance to pitting corrosion, crevice corrosion and chloride-induced stress corrosion cracking, with approximately twice the strength of 316 stainless steel.
Full Forged Construction: The valve body is fully machined from forgings, free of casting defects, with dense grain structure, providing significantly higher pressure-bearing capacity and fatigue life than castings, especially suitable for high-pressure pulsating service conditions.
Floating Ball Design: The ball floats freely under medium pressure and tightly contacts the downstream seat to form self-energized sealing, featuring a simple structure, reliable sealing and sensitive response.
3/4×1/2 Reduced Bore Design: Nominal valve size 3/4 inch with a 1/2 inch bore (reduced bore), reducing weight,operating torque and cost while ensuring process flow capacity, ideal for high-pressure pipelines not requiring full-bore pigging.
Double Block & Bleed (DBB) Function: Equipped with two independent seats for bi-directional bubble-tight shutoff, with a bleed/drain valve in the valve body cavity, enabling on-line cavity pressure relief and seal integrity testing, meeting API 6D isolation requirements.
Threaded / Socket Weld / Buttweld End Connections: Optional NPT female threads, SW socket weld or BW buttweld ends, complying with ASME B16.11/B16.25 standards, ensuring high connection reliability at 600LB high-pressure class.
Fire-Safe Design: Compliant with API 607 standard; in case of PTFE/RPTFE seal burnout, a secondary metal seal is formed between the metal ball and seat ring to prevent medium leakage under fire conditions.
Anti-Static Device: Conductive springs installed between the stem, ball and valve body ensure continuous static dissipation, suitable for flammable and explosive media such as natural gas and oil-gas mixtures.
Blowout-Proof Stem Design: The stem is secured with a bottom shoulder to prevent ejection under abnormal internal pressure, ensuring personnel and equipment safety.
Emergency Seal Lubrication System: Optional sealant injection valves at the seat and stem areas to restore temporary sealing by injecting sealant in emergency situations.
Compact & Lightweight: Small-bore high-pressure design with compact dimensions and light weight, facilitating installation in confined spaces and integration into skid-mounted equipment, instrument tubing and high-pressure distribution systems.
Technical Parameters
Nominal Size: 3/4″ × 1/2″ (DN20 × DN15)
Pressure Class: 600LB (PN100)
Temperature Range: -29℃ to +425℃
Valve Body/Bonnet: ASTM A182 F51 (2205 duplex stainless steel); upgrade to F53 (2507 super duplex stainless steel) available
Ball: Solid F51 or F51 with tungsten carbide hardfacing
Stem: F51, F53 or 17-4PH precipitation hardening stainless steel
Seat Sealing: RPTFE (reinforced PTFE, -50℃~180℃); PEEK (-60℃~260℃); Devlon/Viton (special chemical service)
Gasket: Flexible graphite stainless steel spiral wound gasket or metal ring gasket
Bolts: ASTM A193 B8M (316 stainless steel) or A193 B7 (alloy steel) with cadmium/zinc plating
End Connections: NPT female thread (ASME B1.20.1), SW socket weld (ASME B16.11), BW buttweld (ASME B16.25)
Operation: Manual (lever/wrench with locking device); optional pneumatic (small cylinder) or electric actuator
Design Standards: ASME B16.34, API 608, API 6D
Testing Standards: API 598, API 6D
DBB Certification: Compliant with API 6D Annex H and ISO 14313 DBB requirements
Face-to-Face Dimension: Compliant with ASME B16.10
Applications
Offshore Oil & Gas Platforms: Isolation of corrosive media in platform instrument tubing, chemical injection systems and hydraulic control lines, resistant to seawater and marine atmospheric corrosion.
Petrochemical & Chemical Plants: Sampling, injection, drainage and instrument isolation for chloride-containing media, sour oil-gas (H₂S/CO₂) and chemical intermediates, resistant to stress corrosion cracking.
Seawater Desalination & Marine Engineering: Isolation in reverse osmosis systems and seawater cooling pipelines with superior seawater corrosion resistance, extending service life by 3–5 times compared to 316L.
Natural Gas Processing: Throttling, shutoff and bleed service at high-pressure sour gas wellheads and gathering pipelines, meeting NACE MR0175/ISO 15156 sour service requirements.
High-Pressure Distribution Systems: Compact and reliable shutoff for CNG refueling stations, hydrogen storage and transportation, and high-pressure gas distribution skids.
Advantages & Value
Superior Corrosion Resistance: F51 duplex steel with PREN ≥ 35 provides more than twice the pitting resistance equivalent of 316L, achieving zero corrosion failure in chloride-bearing, sulfur-bearing and acidic environments.
High-Pressure Compact Design: 3/4×1/2 reduced bore combined with 600LB class enables reliable high-pressure sealing in extremely limited spaces, suitable for instrument tubing, skid-mounted units and high-pressure distribution systems.
DBB Safety Assurance: Independent dual-seat sealing plus cavity bleed supports on-line seal testing and safe cavity pressure relief, meeting the strictest process isolation and safety specifications.
Flexible Multi-Connection Adaptation: Optional threaded, socket weld or buttweld ends eliminate mating flanges, reducing installation costs and potential leak points in small-bore high-pressure pipelines.
Comprehensive Safety Compliance: Compliant with API 6D, NACE MR0175, ISO 15848 and other standards; SIL functional safety certification available to meet explosion-proof and functional safety requirements.
