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J-VALVES
Construction Features
F51 Duplex Stainless Steel Body: Forged or precision-cast from ASTM A182 F51 (UNS S32205, 2205 duplex stainless steel) with a ferrite-austenite duplex microstructure. Pitting Resistance Equivalent Number (PREN) ≥ 35. Its resistance to chloride-induced stress corrosion cracking (SCC) is significantly superior to 316 stainless steel, and its yield strength is approximately twice that of 304.
Two-Piece Split Structure: The valve consists of a main body and a bonnet connected by threads or bolts, allowing easy in-line disassembly and maintenance. Seats and ball can be replaced without removing the valve from the pipeline, minimizing downtime.
Floating Ball Design: Medium pressure pushes the ball against the downstream seat to create self-energized sealing. Spring-loaded seats ensure initial sealing under low-pressure conditions, with a simple and reliable structure.
Full Bore Flow Passage: The DN50 bore matches the inner diameter of the pipeline, providing extremely low flow resistance and pressure drop. It allows pig passage and is suitable for high-flow conveying systems.
Precision Lapped Ball: Ball roundness ≤ 0.01 mm, surface roughness Ra ≤ 0.4 μm, achieving precise mating with the seat to ensure bubble-tight sealing.
Elastic Seat Sealing: Standard RPTFE seats offer excellent chemical and thermal stability. Devlon, PEEK or metal sealing are available as options for higher-temperature and abrasive services.
Threaded End Connections: NPT or BSP (G) internal threads conform to ASME B1.20.1 or ISO 228, enabling direct connection with standard piping for easy installation without flanges or welding equipment.
Anti-Static Device: Conductive components are installed between the stem, ball and body to ensure continuous electrostatic discharge, preventing static buildup in flammable media.
Blowout-Proof Stem Design: A retaining shoulder at the stem bottom prevents ejection under medium pressure even if packing fails, ensuring operational safety.
ISO 5211 Actuator Mounting Pad: Top flange complies with ISO 5211, allowing direct mounting of a handle, worm gear, pneumatic or electric actuator for convenient automation upgrades.
Optional Locking Device: The handle is equipped with locking holes to support padlock management and prevent accidental operation.
Technical Parameters
Nominal Diameter: DN50 (2 inch, NPS 2)
Pressure Rating: PN16 to PN160 (Class 150 to Class 900); commonly PN40 / PN63 (Class 300 / 600)
Thread Specification: NPT 2", BSP 2" (Rc/Rp), conforming to ASME B1.20.1 / ISO 7-1 / ISO 228
Face-to-Face Length: Approx. 110–140 mm (varies by manufacturer), complying with factory standards or ISO 5752
Temperature Range: -29℃ to +425℃
Materials
Body / Bonnet: F51 (UNS S32205, 22%Cr/5%Ni/3%Mo+N), F53 (2507 super duplex stainless steel, optional upgrade)
Ball: F51, F53, with optional surface hardening (HCr, WC coating)
Stem: F51, SS316, 17-4PH
Seat: RPTFE, pure PTFE, Devlon V-API, PEEK, SS316 + graphite
Packing: PTFE V-rings, flexible graphite
Gaskets: PTFE, spiral-wound gaskets (F51 + graphite)
Operation: Handle (standard), worm gear (for high-pressure service), pneumatic, electric
Design Standards: API 608, ASME B16.34
Testing Standard: API 598
Applications
Marine & Shipbuilding Engineering: Seawater cooling systems, ballast water systems and fire-fighting systems. F51 resists seawater pitting and crevice corrosion, with a service life 3–5 times that of 316 valves.
Seawater Desalination: Control of high-pressure seawater and brine in reverse osmosis (SWRO) and multi-effect distillation (MED) plants, resistant to high chloride corrosion.
Petrochemical Industry: Control of oilfield produced water and sour natural gas containing H₂S, CO₂ and chloride ions, meeting NACE MR0175 requirements.
Pulp & Paper Industry: Corrosion-resistant isolation in bleaching sections (chlorine-bearing media) and white liquor systems, resisting chloride stress corrosion cracking.
Chemical Industry: Conveying and reaction system control for highly corrosive chemicals (hydrochloric acid, sulfuric acid, caustic soda).
Wastewater Treatment: Treatment systems for chlorinated disinfectants and high-salinity wastewater, resistant to pitting and crevice corrosion.
Oil & Gas Surface Facilities: Oil and gas gathering pipelines containing CO₂/H₂S; F51 resists sulfide stress cracking (SSC).
Food & Pharmaceutical Industry: High-salinity or acidic process media, meeting hygienic surface requirements (electropolishing optional).
Advantages & Value
Excellent Corrosion Resistance: F51 duplex steel with PREN ≥ 35 provides far better pitting and crevice corrosion resistance in chloride environments than 316 stainless steel (PREN = 24), at about half the cost of super austenitic stainless steels.
Superior Strength-to-Weight Ratio: Yield strength ≥ 450 MPa (compared to approx. 205 MPa for 316), allowing a 30% reduction in body wall thickness, lighter weight and easier installation.
Outstanding Cost Efficiency: Material cost is 40–60% lower than super austenitic stainless steels (254SMO, AL-6XN) or nickel-based alloys (Hastelloy C), while performance satisfies most severe service conditions.
Easy Maintenance: Two-piece design permits in-line inspection and repair; threaded connections require no special tools, resulting in low maintenance costs in remote sites.
