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J-VALVES
Structural Features
High‑strength alloy steel material: The valve body is integrally forged or precision‑cast from ASTM A105N high‑strength alloy steel, featuring excellent pressure‑bearing capacity and fatigue resistance.
Small‑bore ultra‑high‑pressure specification: 1‑inch (DN25) nominal bore combined with Class 2500 (PN420) ultra‑high‑pressure rating, meeting shut‑off and modulation requirements for small‑flow ultra‑high‑pressure systems. Wall thickness, bolts and sealing structures are enhanced for the most severe service conditions.
Outside Screw and Yoke (OS&Y) stem design: Stem threads are located outside the valve body and completely isolated from process media to avoid corrosion and contamination. A heavy‑duty yoke supports the stem nut for stable operating torque. Stem travel is visually observable for clear indication of valve open/closed status and opening position, complying with API 602 requirements.
Pressure‑seal bonnet: For Class 2500 ultra‑high‑pressure rating, pressure‑seal bonnet construction delivers tighter sealing as process pressure rises. Octagonal metal ring gaskets or lens‑type gaskets are adopted between bonnet and valve body to guarantee positive sealing under ultra‑high‑pressure conditions.
Fire‑safe design: Compliant with API 607 standard. Metal‑to‑metal sealing maintains sealing performance under fire scenarios and prevents secondary hazards caused by media leakage.
Anti‑blow‑out stem: Top‑mounted anti‑blow‑out stem structure with multiple shoulders and retaining rings prevents stem ejection under abnormal overpressure for operational safety.
Back‑seat sealing design: When the valve is fully open, a metal seal forms between stem and bonnet, permitting on‑line packing replacement without system depressurization and minimizing downtime.
Flexible graphite packing: High‑purity flexible graphite packing offers wide temperature range (-200℃ ~ +600℃), good self‑lubrication and superior sealing performance. A packing grease injection fitting is available for emergency sealing.
Guide rib design: Guide ribs on the disc ensure precise alignment between disc and seat during opening and closing, mitigating vibration and cavitation‑induced damage under high differential pressure and extending sealing surface service life.
Compact reinforced construction: Extremely compact small‑bore ultra‑high‑pressure design with heavy wall thickness optimized for high‑pressure service to guarantee structural integrity and long‑term reliability.
Technical Specifications
Nominal Size: 1" (DN25)
Pressure Rating: Class 2500 (PN420)
Temperature Range: -29℃ ~ +425℃
Valve Body / Bonnet: ASTM A105N (Standard), A182 F11/F22/F91 (High‑temperature), A350 LF2 (Low‑temperature), A182 F304/F316 (Stainless steel)
Disc / Seat: A105N + STL6 overlay, F11 + STL6 overlay, F22 + STL6 overlay, F316 + STL6 overlay, Solid STL6
Stem: F6a, F304, F316, 17‑4PH, Inconel 718, XM‑19 (Nitronic 50)
Sealing Face: STL6 (Stellite No.6), STL21, Nickel‑base alloy, Tungsten carbide
Packing: Flexible graphite, Nickel‑wire reinforced graphite, PTFE (Low‑temperature service)
Gasket: Octagonal / Oval metal ring gasket (BX/RX type, soft iron, 304, 316), Lens‑type gasket, Pressure‑seal ring
End Connection: Socket Weld (SW, ASME B16.11, Standard), Butt Weld (BW, ASME B16.25), Flanged (RF/RTJ, ASME B16.5)
Operation: Manual (Handwheel / Impact handwheel, Standard), Gearbox (Bevel gear for high torque), Pneumatic (Linear stroke), Electric (Multi‑turn)
Design Standard: API 602, ASME B16.34
Test Standard: API 598
Application Fields
High‑pressure injection systems: Applied for precise flow control and reliable isolation in high‑pressure water injection, gas injection and polymer injection services for oil & gas fields, suitable for working pressure above 10000 psi.
High‑pressure sampling systems: Used for on‑line sampling of high‑temperature and high‑pressure reactors and separators with accurate sampling flow control to secure operation safety.
Pressure relief & safety systems: For pressure relief control and safety isolation of high‑pressure vessels and pipelines, working in conjunction with safety valves to realize precise pressure management.
Coal‑chemical gasification: Isolation service for high‑pressure coal‑water slurry, oxygen and syngas in coal gasifiers and syngas cooling systems.
High‑pressure gas storage & transportation: Reliable isolation for filling, storage and transportation systems of CNG, hydrogen, CO₂ and other high‑pressure gases.
General industrial service: Suitable for positive shut‑off and precise modulation of water, steam, oil products, gases and chemicals under ultra‑high‑pressure conditions, serving as critical control equipment for small‑bore ultra‑high‑pressure pipelines.
Advantages & Value
Ultra‑high‑pressure adaptability: Class 2500 (PN420) ultra‑high‑pressure rating with heavy wall thickness and reinforced structure specially engineered for extreme high‑pressure conditions to ensure long‑term safe and reliable operation.
Robust pressure‑assisted sealing: Pressure‑seal bonnet achieves enhanced sealing performance with rising process pressure. Metal ring gaskets resist thermal shock to deliver long‑term positive sealing under ultra‑high‑pressure.
Safe and dependable operation: OS&Y design provides visible stem position indication. Anti‑blow‑out stem and back‑seat sealing safeguard operation and maintenance safety. Impact handwheel enables fast opening and closing under ultra‑high‑pressure.
Convenient on‑site maintenance: Back‑seat sealing allows packing replacement under pressure. Flanged or welded ends simplify installation. Compact structure reduces piping support costs.
Wide service compatibility: Multiple high‑strength alloy steel grades, sealing face materials and end connections are optional, covering extreme service from cryogenic to elevated temperature, for clean and corrosive media.
International‑standard compliance: Designed and manufactured in strict accordance with API 602, ASME, ISO, DIN and other international standards to meet procurement requirements of global ultra‑high‑pressure projects. Full documentation is available including EN 10204 3.1/3.2 material certificates, overpressure test reports, metallurgical analysis reports and NACE compliance certificates.
