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J-VALVES
Design Features
Pressure-actuated Self-sealing Bonnet:Adopts metallic sealing elements such as lens gasket, delta gasket or Ω‑ring. Medium pressure forces the bonnet and body sealing faces into tight contact, achievingpressure‑activated self‑energized sealing. Seating contact pressure increases with rising medium pressure.
One‑piece Forged Body:Valve body is integrally forged from high‑temperature high‑pressure alloy steels including F11, F22, F91, F92, F316 and Inconel 718, featuring dense grain structure and free from casting defects. Pressure rating ranges from Class 900LB to 4500LB.
Butt‑Weld End Design:BW (Butt Weld) ends comply with ASME B16.25, eliminating leakage paths associated with flanged bolted connections, and accommodating thermal expansion and cyclic loading under high temperature and pressure.
Optional Solid / Resilient Wedge:Double solid wedge design automatically compensates for angular misalignment of sealing surfaces. Resilient wedge (NBR/EPDM‑clad) provides zero‑leakage soft sealing, adapting to temperature variations and minor deformations.
Seat Hardfacing Technology:Seat sealing faces are hardfaced with Stellite No.6, No.12 or nickel‑base alloy, with thickness ≥1.6mm and hardness ≥HRC 40, offering excellent erosion and cavitation resistance and allowing in‑line lapping and repair.
Pressure‑seal Bonnet Construction:Bonnet and body are connected by threaded joint or pressure‑seal ring, fitted with segmented gland bolts for convenient assembly and maintenance without special tools.
Blowout‑proof Stem Design:Stem is equipped with a bottom shoulder structure to prevent accidental blowout under internal pressure, complying with API 623 safety requirements.
Low‑friction Packing System:Multi‑layer flexible graphite packing with braided graphite rings provides good self‑lubrication and low operating torque, meeting API 622 low‑emission requirements.
Guiding & Anti‑vibration Design:Precise fit between body guides and wedge prevents vibration and noise under high differential pressure. Cage guiding is provided for large sizes to ensure stable operation.
Flexible Operation:Handwheel (standard), impact handwheel, gearbox, multi‑turn electric actuator, pneumatic/hydraulic actuator, supporting DCS remote control.
Technical Specifications
Size Range: 2″ to 24″ (DN50 to DN600)
Pressure Rating: Class 900LB to 2500LB (PN150 to PN420)
Temperature Range: -29℃ to +425℃
Body: F11 (1.25Cr‑0.5Mo), F22 (2.25Cr‑1Mo), F91 (9Cr‑1Mo‑V), F92 (9Cr‑1Mo‑W‑V), F316, F316L, Inconel 625, Inconel 718
Wedge: F22 with Stellite hardfacing, F91 with Stellite hardfacing, solid carbide, resilient wedge (metal core + graphite/PTFE)
Seat: Body hardfaced with Stellite No.6/No.12, nickel‑base alloy hardfacing
Stem: F6a (410 stainless steel), F316, 17‑4PH, Inconel 718, XM‑19 (Nitronic 50)
Sealing Elements: Lens gasket (octagonal/oval), delta gasket, Ω‑ring, C‑ring (materials: soft iron, 304, 316, F5, Inconel 625)
Packing: Flexible graphite, graphite with nickel wire, low‑chlorine graphite (for nuclear power)
Bolting: B16 (high‑temperature high‑pressure alloy bolts), B8M (stainless steel bolts)
End Connections: Butt Weld (BW, ASME B16.25), Socket Weld (SW, small sizes)
Design Standards: ASME B16.34, API 600, API 602
Test Standards: API 598, ASME B16.34
Face‑to‑Face Dimensions: ASME B16.10
Applications
Petrochemical Hydroprocessing Units:Inlet and outlet of hydrogenation reactors, hot/cold high‑pressure separator systems, recycle hydrogen compressor pipelines, resisting high‑pressure hydrogen attack and H₂S stress corrosion.
Coal Chemical Industry:High‑pressure coal slurry pipelines, syngas cooling systems, black water/ash water pipelines in coal gasification plants (Shell, Texaco, GSP processes), with excellent erosion and corrosion resistance.
Ammonia & Urea Plants:Synthesis tower inlet/outlet, high‑pressure carbamate pump pipelines, CO₂ compressor systems, operating at 15–32MPa.
Deepwater Oil & Gas:Subsea production systems, deepwater risers, high‑pressure water injection pipelines, resisting high pressure and seawater corrosion.
Advantages & Value
Dynamic Self‑energized Sealing:Pressure‑activated self‑sealing structure automatically increases seating contact pressure with rising medium pressure. Sealing performance is superior at high pressure compared with medium/low pressure, completely eliminating bonnet leakage risk.
Eliminated Flange Leakage Paths:Butt‑weld connections replace flanged joints, reducing potential external leakage points by over 50%, meeting EPA low‑emission and ISO 15848‑1 BH requirements.
Extreme Service Adaptability:One‑piece forged construction combined with high‑temperature high‑pressure alloys withstands supercritical parameters and thermal cycling loads, with safety factors compliant with ASME B16.34 wall thickness calculations.
Long Service Life & Maintainability:Stellite‑hardfaced sealing faces feature high hardness and erosion resistance, allowing in‑line lapping and repair. Pressure‑seal structure enables easy assembly and disassembly without pipe cutting.
