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J-VALVES
Design Features
ASTM A105N Normalized Carbon Steel:The valve body is made of normalized ASTM A105N carbon steel with refined grains, uniform microstructure and relieved forging stresses. It delivers excellent overall mechanical properties, low-temperature toughness and weldability, superior to conventional A105 material, making it ideal for high-pressure services.
Bellows Seal System:Multi-layer stainless steel bellows serve as the dynamic stem sealing element, fully isolating the stem from the process medium. This eliminates micro-leakage inherent in conventional packing seals and complies with stringent emission standards including TA-Luft, ISO 15848-1 BH and EPA Method 21.
Dual Sealing Protection:Metal bellows act as the primary seal, with packing as a secondary backup seal. In the unlikely event of bellows failure, the packing retains emergency sealing capability for enhanced safety redundancy.
Outside Screw and Yoke (OS&Y) Design:Stem threads are located outside the valve body, completely isolated from the process fluid. The yoke supports the stem nut for stable operating torque, and the open position is clearly visible. The design fully meets API 602 requirements.
Wedge Type Flexible Solid Wedge:The gate features a one-piece flexible wedge design with precision-
machined wedge angle, ensuring tight shutoff through matched body-seat wedge faces. The flexible structure compensates for thermal deformation, maintaining reliable sealing under high-temperature and high-pressure conditions.
Class 800LB High-Pressure Rating:Engineered to API 602 Class 800 (PN130), the valve features reinforced wall thickness, bolting and sealing configurations to satisfy reliable isolation demands in small-bore high-pressure systems.
Fire-Safe Design:Designed in accordance with API 607, the metal-to-metal sealing structure maintains sealing integrity under fire conditions, preventing secondary hazards caused by media leakage.
Blowout-Proof Stem:The stem incorporates a top-entry anti-blowout design with shoulder and retaining ring, preventing stem ejection under abnormal internal pressure and ensuring operational safety.
Back Seat Design:When fully open, a metal seal forms between the stem and bonnet, allowing online replacement of backup packing without system shutdown.
Compact & Lightweight:The small-bore high-pressure structure is compact and lightweight, facilitating installation in space-restricted areas and reducing pipeline support costs.
Technical Specifications
Nominal Size: 0.75" (DN20)
Pressure Class: API 602 Class 800LB (PN130)
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A105N (normalized), A350 LF2 (low-temperature), A182 F304/F316 (stainless steel), A182 F11/F22 (high-temperature)
Gate: A105N + ENP, F304, F316, F11 + Stellite overlay
Stem: F6a, F304, F316, 17-4PH, Inconel 718
Bellows: ASTM A240 321, 347, 316L, Inconel 625, Hastelloy C-276 (multi-layer hydraulically formed)
Seat Seal: Base material A105N + Stellite 6 overlay, F304 + Stellite 6 overlay, F316 + Stellite 6 overlay
Packing: Flexible graphite (backup), PTFE (low-temperature service)
Gaskets: Flexible graphite spiral-wound gasket, ring type joint (RTJ), pressure self-tightening seal ring (high-pressure)
End Connections: Socket Weld (SW, ASME B16.11), Butt Weld (BW, ASME B16.25); flanged (RF/RTJ) on request
Operation: Manual (handwheel), bevel gearbox (high-torque), pneumatic (linear), electric (multi-turn)
Design Standard: API 602, ASME B16.34
Inspection & Test Standard: API 598
Applications
Flammable & Explosive Media Systems:Used for shutoff of LPG, LNG, hydrogen, ethylene, propylene and other hazardous fluids, eliminating fire and explosion risks from leakage.
Valuable Media Systems:Applied to isolation of rare gases, high-purity chemicals and costly process fluids, minimizing product loss and improving economic efficiency.
Vacuum Systems:Bellows sealing is suitable for high-vacuum systems, preventing air infiltration and media
emission to maintain vacuum level and process purity.
Chemical & Petrochemical Industry:Used in high-pressure injection and sampling systems for catalysts, additives and toxic solvents, ensuring safe operation.
General Industrial Service:Suitable for reliable isolation in any small-bore high-pressure systems where leakage is unacceptable, providing ultimate zero-emission safety assurance.
Advantages & Value
Absolute Zero Emission Guarantee:Bellows sealing eliminates all leak paths from dynamic stem movement, complying with strictest environmental and safety regulations and avoiding catastrophic releases of toxic and hazardous materials.
Maintenance-Free Long Service Life:Bellows fatigue life ≥ 10,000 cycles with no need for periodic packing adjustment or replacement, greatly reducing maintenance workload and downtime, especially ideal for hard-to-reach or hazardous locations.
Dual Safety Redundancy:Primary bellows seal plus secondary packing seal ensures continued containment in case of unexpected bellows failure, delivering the highest level of safety.
Optimized for High-Pressure Small-Bore Service:Class 800LB rating with 3/4" size is specifically engineered for reliable isolation in high-pressure, low-flow systems, with compact structure and easy installation.
Wide Temperature Compatibility:Metal bellows cover extreme temperatures from cryogenic -196℃ up to +600℃, suitable for almost all industrial applications.
Safe & Reliable Operation:OS&Y design provides clear visual position indication; blowout-proof stem and back seat ensure safe operation and maintenance. Extended bonnet protects personnel from extreme temperature exposure.
Extensive Application Versatility:Multiple body materials, bellows alloys and end connections are available, covering extreme conditions from cryogenic to ultra-high temperature, vacuum to ultra-high pressure, inert to highly corrosive media.
International Standard Compliance:Manufactured strictly in accordance with API 602, ASME, ISO, DIN and other global standards, meeting requirements for high-end international projects. Full documentation is supplied including material certificates (EN 10204 3.1/3.2), bellows fatigue test reports, leakage detection reports (helium mass spectrometry / sniffing method), NACE compliance and environmental certifications.
