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J-VALVES
Design Features
F316L Ultra-Low Carbon Stainless Steel Construction: The valve body is integrally forged from ASTM A182 F316L (00Cr17Ni14Mo2) ultra-low carbon stainless steel, with carbon content ≤0.03% and molybdenum content of 2.0–3.0%, delivering a PREN value ≥24. Its resistance to pitting corrosion, crevice corrosion and intergranular corrosion is significantly superior to F304L, making it ideal for high-pressure applications involving highly corrosive media such as chloride ions, sulfuric acid and formic acid.
Resilient Wedge Design: Featuring a wedge-type resilient wedge with a central slot or integral flexible structure, the wedge undergoes slight deformation under seat compression upon closing, automatically compensating for angular deviations of sealing surfaces to ensure uniform contact and reliable bi-directional sealing, suitable for PN63 high-pressure service.
Full Bore Straight-Through Flow Passage: When fully open, the wedge retracts into the bonnet, providing an unobstructed straight-through flow path with an extremely low flow resistance coefficient (ζ≈0.1–0.3) and negligible pressure loss. It is designed for pipeline on-off service and not for throttling regulation.
High-Pressure Flanged Connection: The valve body is equipped with Type B (raised face) flanges complying with EN 1092-1 PN63. For DN50, the flange outer diameter is 180mm, bolt circle diameter 135mm, 4×M22 bolts, and flange thickness 26mm, ensuring reliable connection and sealing under 6.3MPa high pressure.
Stem Travel Indication: The exposed stem section is fitted with a stroke scale or position indicator for clear visual indication of valve open/closed status, facilitating on-site operation and remote monitoring and preventing misoperation.
Low Operating Torque: The stem nut is made of friction-reducing materials (copper alloy or self-lubricating composite), matched with precision machined threads to minimize lifting friction. Manual operation of the DN50 small-bore valve is effortless, and small actuators can be optionally fitted.
Fire-Safe Design: Complies with API 607 standards. Graphite packing and metal sealing elements maintain sealing integrity under fire conditions to prevent media leakage.
Blowout-Proof Stem: The integrally forged top-entry stem is designed with anti-blowout steps and sealing rings. Even if the packing gland accidentally loosens, the stem remains retained by the bonnet, ensuring operational safety in high-pressure conditions.
Graphite Packing Seal: The stuffing box uses flexible graphite braided packing or graphite ring assemblies, offering a wide temperature range (-196℃ to +500℃), no hardening at low temperatures and excellent self-lubrication for long-term reliable dynamic stem sealing.
Compact & Lightweight Design: The DN50 valve has a face-to-face length of approximately 216mm and weighs 5–8kg. Its compact structure allows easy installation in dense pipe racks and confined equipment spaces.
Technical Parameters
Nominal Size: DN50 (2″)
Pressure Class: PN63 (6.3MPa)
Body Material: ASTM A182 F316L
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A182 F316L
Wedge: F316L + Stellite hardfacing (sealing surface hardening) / integral hardening treatment
Seat: F316L + Stellite hardfacing (sealing surface)
Stem: F316L / 17-4PH / Inconel 718, high strength and corrosion resistant
Packing: Flexible graphite braided packing / graphite rings / Inconel wire-reinforced graphite (high-temperature type)
Gasket: Stainless steel spiral wound gasket (316L/flexible graphite filling) / metal ring gasket (octagonal / oval)
Bolts: ASTM A193 B8M (stainless steel, corrosion resistant) / B7 (carbon steel, ambient temperature)
Nuts: ASTM A194 8M / 2H
End Connection: Flanged (Type B raised face) to EN 1092-1 PN63; BW butt-weld ends available upon request
Flange Face Dimensions: Compliant with EN 1092-1
Face-to-Face Dimensions: Compliant with EN 558 / ISO 5752
Operation: Manual (handwheel / lever), pneumatic (linear stroke), electric (multi-turn, on-off / modulating), hydraulic
Design Standards: API 600, API 603, ASME B16.34
Test Standard: API 598
Applications
Highly Corrosive Chemical Processes: Used in DN50 high-pressure pipelines of chlor-alkali, organochlorine, pesticide, dye and other highly corrosive chemical plants. F316L material resists chloride ion and acid-base corrosion, while PN63 rating meets high-pressure process requirements.
Petrochemical Hydroprocessing Units: Applied in DN50 high-pressure hydrogen and hydrogen sulfide pipelines for hydrocracking, hydrotreating and catalytic reforming units. F316L provides resistance to hydrogen embrittlement and sulfide stress corrosion, ensuring safety in hydrogen service.
Offshore Engineering: Installed in DN50 seawater, crude oil and natural gas control pipelines on offshore platforms, FPSOs and subsea systems. F316L withstands seawater and oil-gas corrosion, meeting requirements of deepwater high-pressure environments.
General Industrial Service: Suitable for on-off and isolation of DN50 high-pressure water, oil, gas, chemicals and other corrosive media, especially in chloride-containing environments and conditions with intergranular corrosion risks.
Advantages & Value
Zero Flow Resistance in Full Open Position: The fully retracted wedge creates an unobstructed flow path with near-zero pressure loss, reducing pumping energy consumption. Ideal for high-flow pipeline isolation with no flow disturbance or eddy formation.
Reliable Sealing with Resilient Wedge: The wedge-type resilient wedge automatically compensates for sealing surface misalignment, delivering consistent bi-directional sealing and zero leakage at PN63, meeting pipeline isolation and maintenance safety requirements.
High-Pressure Flanged Connection: EN 1092-1 PN63 flanges ensure secure connection at 6.3MPa, fully compatible with European standard piping without adapter flanges, lowering engineering matching costs.
Compact & Easy Installation: Weighing only 5–8kg with a length of ~216mm, the DN50 valve enables flexible installation in dense piping and confined spaces, reducing pipe rack and support costs.
Effortless & Flexible Operation: Friction-reduced stem nut design results in an operating torque below 15N·m for DN50, allowing single-hand operation. Small pneumatic/electric actuators are available for remote automation.
European Standard Interchangeability: Strictly conforms to EN 1092-1, EN 12516, EN 558 and API 600, ensuring full interchangeability with DN50 PN63 valves and piping accessories from major European brands, reducing inventory and replacement costs.
Safety & Compliance Compliance: Fire-safe and blowout-proof designs meet API 607 and high-pressure equipment safety codes, with third-party certification to protect personnel and equipment in corrosive high-pressure systems.
System Protection Value: Reliable isolation safeguards downstream pumps, valves, reactors, membrane modules and other precision equipment, avoiding equipment damage and environmental pollution caused by corrosive media leakage, and reducing accident risks and maintenance costs.
