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J-VALVES
Structural Features
Valve Body: F304, F316, F316L, F51 Duplex Stainless Steel, F53 Super Duplex Stainless Steel, F55 Super Duplex Stainless Steel, 6Mo Super Austenitic Stainless Steel
Ball / Valve Stem: F316 + Hard Chrome / ENP, F51/F53/F55, 6Mo, Inconel 625 with Tungsten Carbide Coating
Advantages: Excellent corrosion resistance, resistance to chloride stress corrosion cracking, high-temperature strength and low-temperature toughness.
Trunnion-mounted Ball Structure: The ball is supported and fixed by upper and lower bearings, delivering stable operating torque unaffected by medium pressure fluctuations, suitable for high pressure differential and large-bore applications.
Spring-loaded Seat: Disc springs or coil springs are installed behind the seats to ensure initial sealing at low pressure; medium pressure enhances sealing at high pressure, achieving reliable sealing across the full pressure range.
Double Piston Effect (DPE) Seat: DPE design is optional. Cavity pressure acts on both upstream and downstream seats simultaneously, providing bidirectional reliable sealing and meeting double isolation requirements.
Full / Reduced Bore Available: Full bore design meets pigging requirements; reduced bore design lowers costs to adapt to different working conditions.
Various End Connections: RF / RTJ Flange, BW (Butt Weld), Hub Connection, suitable for different pressure ratings and installation requirements.
Primary Sealing: PEEK, Devlon, Nylon seats, high pressure and wear resistant.
Metal Sealing: Hardfaced with Stellite, Tungsten Carbide or Nickel-based Alloy, high temperature and high pressure resistant, fire-safe.
Fire-safe Design: In compliance with API 6FA / API 607. Metal-to-metal sealing remains effective after soft seals burn out, preventing medium leakage in case of fire.
Anti-static Device: Anti-static springs installed between the ball, stem and body to effectively discharge static electricity and eliminate explosion risks.
Blowout-proof Stem: Integrally forged T-head stem structure prevents stem ejection under internal pressure, ensuring operational safety.
Emergency Sealant Injection: Sealant injection valves provided at seat and stem areas to restore sealing performance by injecting sealant in emergency situations.
Seat Self-relief Function: In case of overpressure in the body cavity, the seat automatically disengages from the ball to relieve pressure to the low-pressure side, preventing overpressure damage to the valve body.
Low-friction Bearings: Upper and lower bearings made of Devlon, PEEK or metal bushings to reduce friction and enable easy operation.
Technical Parameters
Size Range: 2″ to 56″ (DN50 to DN1400)
Pressure Class: 600LB to 2500LB (PN100 to PN420)
Temperature Range: -29℃ to +425℃
Valve Body: F304, F316, F316L, F51, F53, F55, 6Mo, 625, C276
Ball: F316 + Hard Chrome / ENP, F51/F53/F55, 6Mo, 625 + Tungsten Carbide
Stem: F316, F316L, 17-4PH, Inconel 718, Monel K-500
Seat: PEEK, Devlon, Nylon, PTFE, RPTFE, Stellite, Tungsten Carbide, Nickel-based Alloy
Bearing / Seal: Devlon, PEEK, Stellite, Nickel-based Alloy, Tungsten Carbide
Spring: Inconel 718, Hastelloy C-276, 17-7PH
Packing / Gasket: Flexible Graphite, Graphite Composite, Metal Ring Gasket
End Connection: Flanged (RF/RTJ), Butt Weld (BW), Hub Connection (API 6A)
Operation: Manual (Gearbox), Pneumatic (Scotch Yoke / Rack & Pinion), Electric, Hydraulic, Electro-hydraulic Actuated
Design Standard: API 6D, API 608, ASME B16.34
Test Standard: API 6D
Face-to-Face Dimension: ASME B16.10
Applications
High-pressure Long-distance Pipelines: Used in cross-regional high-pressure transmission pipelines for crude oil, refined oil products and natural gas, for line isolation and station block service.
High-pressure Gathering & Transportation Systems: Suitable for high-pressure gathering pipelines, water injection and gas injection pipelines in oil and gas fields, resistant to high pressure differential and sand-bearing media.
High-pressure Chemical Plants: Applied in high-pressure reaction systems, hydrocracking, ammonia synthesis and urea plants for material isolation and safety interlocking.
High-pressure LNG Export: Used in high-pressure gasification and export systems at LNG receiving terminals, suitable for high-pressure ambient-temperature natural gas service.
Sour Oil & Gas Fields: In compliance with NACE standards, suitable for high-pressure exploitation and gathering of sour natural gas containing H₂S and CO₂.
Subsea High-pressure Systems: API 6DSS certified design, suitable for deepwater high-pressure pipelines and subsea production facilities.
Advantages & Value
Ultra-high Pressure Adaptability: Trunnion-mounted structure ensures stable operation and reliable sealing up to 2500LB (42MPa) and above.
Full-range Sealing: Dual action of spring preloading and medium pressure self-energizing provides zero-leakage sealing from vacuum to ultra-high pressure.
Stable Operating Torque: Bearing-supported structure eliminates the influence of medium pressure on operating torque, facilitating accurate actuator selection.
Extreme Environment Compatibility: Duplex / super duplex stainless steels perform well in extreme corrosive environments containing chloride, H₂S and CO₂.
Strong Standard Compatibility: Strictly conforms to API 6D/6A and ASME standards, enabling seamless integration with global high-pressure equipment systems.
Automation Integration: Standardized actuator interfaces and SIL certification allow easy integration with SCADA systems for remote monitoring and emergency shutdown.
Comprehensive International Certifications: Fully certified with API 6D, API 6A, API 6FA, SIL, NACE, PED, ATEX and others, ensuring compliance for global projects.
