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J-VALVES
Structural Features
F304 Austenitic Stainless Steel Material: The valve body adopts ASTM A351 CF8 (F304) or ASTM A182 F304 austenitic stainless steel. It delivers excellent corrosion resistance for various chemical media and atmospheric corrosive environments, together with favourable weldability and machinability.
Special 5.5‑inch Bore: Non‑standard special bore design (approx. DN140), situated between standard DN125 (5") and DN150 (6"). Customisable to meet project‑specific requirements for special flow rates and installation space constraints.
PN300 High‑Pressure Rating: High‑pressure class roughly equivalent to ANSI Class 2000 for medium‑to‑high pressure service. Wall thickness, bolting and sealing construction are reinforced for high‑pressure operating conditions.
Wedge Flexible Gate: One‑piece flexible wedge gate with precision‑machined wedge angle. Reliable sealing is achieved by mating wedge surfaces of gate and valve seat. The flexible structure compensates thermal deformation induced by temperature fluctuation to guarantee sealing performance.
Flanged or Welded Ends: RF (Raised Face) or RTJ (Ring‑Type Joint) flanged connection, or butt‑weld (BW) connection complying with EN 1092‑1 / ASME B16.5 to secure connection integrity under high‑pressure service.
Pressure‑Seal Bonnet (High‑Pressure Version): PN300 high‑pressure version adopts pressure‑self‑tight bonnet construction; sealing performance improves with rising process pressure, well suited for high‑pressure conditions.
Fire‑Safe Design: Compliant with API 607. Metal‑to‑metal sealing retains tightness under fire conditions to prevent media leakage.
Stem Anti‑Blow‑Out Construction: Top‑mounted anti‑blow‑out stem design equipped with shoulder and retaining rings, preventing stem ejection under abnormal internal pressure for operational safety.
Back‑Seat Design: Metal sealing forms between stem and bonnet at fully open position, enabling on‑line packing replacement without system depressurisation.
Long‑Stem Guide Assembly: Intermediate guide bracket fitted for extended stem to avoid stem bending and vibration caused by large length‑to‑diameter ratio, ensuring smooth opening and closing.
Flexible Graphite Packing: High‑purity flexible graphite packing with wide temperature range of ‑200℃ ~ +600℃, good self‑lubrication and outstanding sealing performance. Special low‑emission packing is optional for cryogenic service.
Technical Data
Nominal Size: 5.5" (DN140)
Pressure Class: Class 2000 (PN300)
Temperature Range: ‑196℃ ~ +538℃
Long Stem Length: Customised per application, typical range 500mm to 5000mm; buried‑type version normally extends 300‑500mm above grade for accessible operation
Valve Body / Bonnet: ASTM A351 CF8 (F304), CF8M (F316), CF3 (304L), CF3M (316L)
Gate: F304 with Stellite 6 hardfacing, F316 with Stellite 6 hardfacing, solid F304
Seat: Integral F304 body with Stellite 6 hardfacing, replaceable Stellite 6 hard alloy seat
Stem: F304, F316, 17‑4PH, XM‑19 (Nitronic 50), Inconel 718
Packing: Flexible graphite, nickel‑wire reinforced graphite, PTFE (for cryogenic service), low‑emission packing
Gasket: Flexible graphite spiral wound gasket (304/316), metal ring gasket (RTJ), pressure self‑sealing ring (high‑pressure service)
Long‑Stem Protective Sleeve: Stainless steel 304/316, carbon steel with anti‑corrosion coating
End Connection: Flanged (RF/RTJ, EN 1092‑1 / ASME B16.5), Butt‑Weld (BW, ASME B16.25 / EN 12627)
Operation: Manual (handwheel / chainwheel / extension stem), gearbox (bevel gear / worm gear), pneumatic (linear stroke), electric (multi‑turn), hydraulic
Design Standard: API 600, ASME B16.34
Test Standard: API 598
Application Fields
Buried Pipeline Systems: Surface‑operated isolation for buried main pipelines of city gas, heat supply and water supply & drainage. Minimises or eliminates valve chambers to reduce civil engineering costs.
Cryogenic Storage & Transportation Facilities: Remote operation for tank nozzles, loading‑off arms and pipe bridges handling cryogenic media such as LNG, liquid nitrogen, liquid oxygen and liquid argon, preventing packing freeze‑up.
Adjacent to High‑Temperature Equipment: Pipeline isolation near boilers, furnaces and reactors, protecting operators from thermal radiation hazards.
Insulated Piping Systems: Suitable for insulated piping carrying high‑temperature high‑pressure steam and hot oil. Extended stem penetrates thermal insulation layer for convenient operation and maintenance.
Chemical & Petrochemical Industry: Pipeline isolation for buried or equipment‑adjacent lines conveying corrosive, toxic and hazardous media to ensure operational safety.
Offshore Platforms & Vessels: Pipeline operation under decks and inside compartments of offshore platforms and ships, resolving confined‑space challenges.
Tunnels & Utility Tunnels: Pipeline systems in utility tunnels, power tunnels, railway and highway tunnels for remote grade‑level operation.
General Industrial Service: Reliable isolation for any special installation requiring stem extension, remote operation or thermal isolation.
Advantages & Value
Adaptability for Special Installation Conditions: Long‑stem design addresses operational difficulties under buried, cryogenic, high‑temperature and space‑limited conditions, avoiding costly valve chambers or protective structures.
Cost‑Effective Corrosion‑Resistant F304 Material: Austenitic stainless steel resists various corrosive media with better cost‑performance than F316, applicable for a wide range of corrosive environments.
Flexible Special‑Bore Customisation: 5.5‑inch special bore satisfies application‑specific flow and installation requirements; non‑standard dimensions available upon project request.
Reliable High‑Pressure Rating: PN300 pressure class combined with pressure‑seal bonnet guarantees long‑term dependable performance under high‑pressure service.
Convenient Automation Integration: Standard flanges or couplings at the top of long stem accommodate various actuators to facilitate remote control and automated operation.
Stable Guiding Construction: Intermediate guide bracket prevents deflection of extended stem, ensuring smooth actuation and reliable sealing at high length‑to‑diameter ratios.
Wide Application Coverage: Multiple stainless steel grades, sealing configurations, stem extension lengths and operation modes are optional, covering broad special service from cryogenic to high‑temperature, buried to overhead, clean to corrosive media.
International‑Standard Compliance: Designed and manufactured strictly in accordance with API 600, ASME, EN, ISO and other international standards to meet global project procurement requirements. Complete documentation available including material certificates (EN 10204 3.1 / 3.2), long‑stem deflection calculation report, low‑emission test report and NACE compliance certificate.
