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J-VALVES
Structural Features
Ultra‑low‑carbon stainless steel CF3 material: The valve body is precision‑cast from ASTM A351 CF3 (304L) austenitic stainless steel. It delivers excellent resistance to intergranular corrosion, requires no post‑weld heat treatment, and possesses favourable corrosion resistance, suitable for a wide range of chemical media.
Large‑bore medium‑high pressure specification: 12‑inch (DN300) large bore combined with Class 300 (PN50) medium‑high pressure rating meets shut‑off and throttling requirements for high‑flow systems, applicable to main pipelines and critical process nodes.
Pneumatic actuator operation: Equipped with high‑torque linear‑stroke pneumatic actuator; double‑acting or single‑acting (spring return) versions are optional.
Flanged connection: RF (Raised Face) flanged connection complying with ASME B16.5 standard, facilitating integration with existing piping systems for easy installation and disassembly.
Fire‑safe design: Complies with API 607 standard. Metal‑to‑metal seating maintains sealing performance under fire conditions to prevent media leakage.
Anti‑blow‑out stem design: The stem adopts top‑mounted anti‑blow‑out construction with shoulder and retaining ring, preventing stem ejection under abnormal internal pressure and ensuring 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 or PTFE packing: High‑purity flexible graphite packing features wide temperature range (-200 ℃ ~ +600 ℃) and good self‑lubricity. PTFE packing is optional for low‑temperature or highly corrosive service with superior sealing performance.
ISO 5211 top mounting flange: ISO 5211 standard top flange interface (F14/F16) on the yoke supports mounting of pneumatic, electric and hydraulic actuators for automated control.
Technical Data
Nominal Size: 12" (DN300) Pressure
Class: Class 300 (PN50)
Temperature Range: -196 ℃ ~ +425 ℃
Body / Bonnet: ASTM A351 CF3 (304L), CF8 (304), CF8M (316), CF3M (316L)
Disc / Seat: CF3 + Stellite 6 overlay, CF8 + Stellite 6 overlay, F316 + Stellite 6 overlay, solid Stellite 6
Stem: F304, F316, 17‑4PH, XM‑19 (Nitronic 50), Inconel 718
Seating Surface: Stellite 6, Stellite 21, nickel‑base alloy, tungsten carbide
Packing: Flexible graphite, PTFE, nickel‑wire reinforced graphite
Gasket: Flexible graphite spiral‑wound gasket (304/316), metallic ring‑joint gasket (RTJ)
End Connection: Flanged (RF, ASME B16.5); RTJ flange optional; Butt‑Weld (BW) optional
Operation: Pneumatic (double‑acting / single‑acting spring‑return as standard); multi‑turn electric; hydraulic; manual (handwheel / gearbox for emergency backup)
Design Standards: API 600, ASME B16.34, BS 1873
Test Standard: API 598
Application Fields
Chemical and petrochemical industry: Used for corrosive‑media transfer and reaction systems in large‑scale chemical plants, refineries and petrochemical complexes, for high‑flow control and isolation of organic acids, alkaline liquors, solvents and other fluids.
Cryogenic storage & handling systems: Benefiting from outstanding low‑temperature toughness of CF3 material, it is applied for flow control and isolation on large‑capacity storage tanks, loading arms and pipe bridges handling LNG, liquid nitrogen, liquid oxygen and other cryogenic media.
Water treatment & environmental protection: For high‑flow corrosive‑water control in large water supply & wastewater plants and seawater desalination units.
Offshore engineering & marine: For high‑flow control in seawater cooling, ballast water and fire‑fighting systems with seawater corrosion resistance.
General industrial service: Provides reliable shut‑off and precise throttling for media including water, steam, oil products, gases and chemicals, acting as critical control equipment for large‑bore medium‑high‑pressure pipelines.
Advantages & Value Proposition
Fast‑response large‑bore pneumatic control: 12‑inch size paired with pneumatic actuator delivers rapid response with adjustable opening‑closing time, satisfying requirements for fast modulation and emergency shut‑off in high‑flow systems.
Weld‑friendly ultra‑low‑carbon material: CF3 (304L) with maximum carbon content ≤0.03 % requires no post‑weld heat treatment and exhibits excellent intergranular corrosion resistance, suitable for welded installation and site retrofit.
Precise throttling performance: Conical / parabolic disc with guiding structure delivers stable flow characteristics and high modulating accuracy for accurate process control.
Complete automation capability: Actuator can be fitted with positioner, limit switches and solenoid valves to realize 4‑20 mA modulating control and remote monitoring, easy integration into DCS / SIS systems.
High safety reliability: Single‑acting spring‑return version automatically moves to safe position upon air loss. Fire‑safe, anti‑static and anti‑blow‑out designs ensure safe operation under hazardous service conditions.
Convenient on‑site maintenance: Back‑seat seal allows packing replacement under pressure; flanged ends simplify installation and inspection; modular pneumatic actuator facilitates servicing and component replacement.
Broad application scope: Multiple stainless steel grades, sealing options and actuator configurations are available, covering service from cryogenic to high temperature and from clean to highly corrosive fluids.
International‑standard compliance: Designed and manufactured in accordance with API 600, ASME, EN, ISO and other global standards for worldwide project procurement. Complete documentation including EN 10204 3.1 / 3.2 material certificates, test reports, SIL and explosion‑proof certifications can be provided.
