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J-VALVES
Design Features
A105N Normalized Forged Steel:The valve body is integrally forged from high-quality ASTM A105N carbon steel with normalized treatment, featuring uniform refined grains. It has a tensile strength of ≥485MPa and yield strength of ≥250MPa, with impact toughness significantly superior to ordinary A105. It meets pressure-bearing requirements for general industrial conditions and is suitable for non-corrosive media such as water, oil and gas.
Flexible Wedge Structure:Designed as a wedge-type flexible wedge with a central slot or integral flexible structure. Slight deformation occurs under compression from the seat when closing, automatically compensating for angular deviations of sealing surfaces to ensure uniform contact and achieve reliable bi-directional sealing.
Full Bore Straight Flow Passage:When fully open, the wedge retracts into the bonnet, providing an unobstructed straight flow path with an extremely low flow resistance coefficient (ζ≈0.1–0.3) and negligible pressure loss. It is ideal for pipeline shut-off service but not recommended for throttling regulation.
Flanged Connection (RF):Complies with EN 1092-1 / ASME B16.5 standards, enabling convenient installation and suitable for applications requiring frequent disassembly.
Threaded Connection (NPT/BSP):Complies with ASME B1.20.1 / ISO 228 standards, featuring a compact structure and suitable for low-pressure small-bore pipelines.
Socket Weld (SW):Complies with ASME B16.11 standards, offering high welding strength and suitable for medium and high-pressure pipelines.
Butt Weld (BW):Complies with ASME B16.25 / EN 12627 standards, adopting full-penetration welding and suitable for high-pressure, flammable, explosive and toxic media.
Low Operating Torque:The stem nut is made of friction-reducing materials (copper alloy or self-lubricating composite) with precision machined threads to minimize lifting friction. The DN50 small-bore valve is lightweight for manual operation and can be equipped with a small-sized actuator.
Fire-Safe Design:Complies with API 607 standards. Graphite packing and metal sealing elements maintain sealing performance under fire conditions to prevent media leakage.
Blowout-Proof Stem:The stem adopts an integrally forged top-entry structure with anti-blowout steps and sealing rings. Even if the packing gland accidentally loosens, the stem remains retained by the bonnet to ensure operational safety.
Graphite Packing Seal:The stuffing box uses flexible braided graphite packing or graphite ring assemblies, with a wide temperature range (-29℃ to +500℃), no hardening at low temperatures and excellent self-lubrication, ensuring long-term reliability of dynamic stem sealing.
Guide Rib Design:Internal guide ribs are provided in the valve body to prevent deflection during lifting, ensure even stress on sealing surfaces, avoid jamming and scoring, and extend service life.
Technical Parameters
Nominal Size: DN50 (2″)
Pressure Rating: PN16–PN160 (Class 150–Class 900)
Body Material: ASTM A105N
Temperature Range: -29℃ to +425℃
Body / Bonnet: ASTM A105N
Wedge: A105N + Stellite hardfacing (sealing surface hardened) / 13Cr stainless steel
Seat: A105N + Stellite hardfacing (sealing surface)
Stem: A276 410 / 420 / 304 / 316 stainless steel, high strength and wear resistance
Packing: Flexible braided graphite / graphite rings / PTFE V-rings
Gasket: Non-asbestos fiber gasket / graphite spiral wound gasket / metal ring gasket
Bolts: ASTM A193 B7 / B7M / B8M (selected based on temperature and corrosion conditions)
Nuts: ASTM A194 2H / 2HM / 8M
End Connections: Flanged (RF, EN 1092-1 / ASME B16.5), Threaded (NPT/BSP), Socket Weld (SW), Butt Weld (BW)
Face-to-Face Dimension: Complies with ASME B16.10
Operation: Manual (handwheel / lever), Pneumatic (linear stroke), Electric (multi-turn, on-off / modulating), Hydraulic
Design Standard: API 600, ASME B16.34
Test Standard: API 598
Applications
Oil & Gas Transportation:Used for shut-off in DN50 gathering, transportation, metering and station pipelines for crude oil, refined oil and natural gas. A105N material adapts to general corrosion conditions, and normalized treatment ensures low-temperature toughness.
Chemical Process Systems:Applied for shut-off in DN50 process pipelines for various chemical media, solvents and hydrocarbons. The flexible wedge ensures reliable sealing, and graphite packing provides chemical corrosion resistance.
General Industrial Service:Suitable for shut-off and isolation of non-corrosive media such as water, oil and gas in DN50 pipelines, serving as a standard component in industrial piping systems.
Advantages & Value
Superior Toughness from Normalization:Normalized A105N features refined grains with significantly higher impact toughness than ordinary A105, preventing brittle fracture under low-temperature and shock conditions and protecting personnel and equipment.
Near-Zero Flow Resistance in Full Open:The fully retracted wedge provides an unobstructed flow path with nearly zero pressure loss, reducing pumping energy consumption and ideal for high-flow pipeline shut-off.
Reliable Sealing with Flexible Wedge:The wedge-type flexible structure automatically compensates for sealing surface deviations, delivering consistent bi-directional sealing and zero leakage to meet pipeline isolation and maintenance safety requirements.
Flexible Connection Options:Flanged, threaded, socket-weld and butt-weld connections are available to adapt to various piping standards and working conditions, enabling convenient on-site installation and reducing project costs.
Light and Flexible Operation:Friction-reduced stem nut design results in an operating torque below 15N·m for DN50 valves, allowing single-hand operation. Small pneumatic/electric actuators are optional for remote automatic control.
Safety and Compliance Assurance:Fire-safe and blowout-proof designs comply with API 607 and industrial safety codes, verified by third-party testing to safeguard personnel and system equipment.
Enhanced System Protection:Reliable shut-off protects downstream pumps, valves, instruments and other precision equipment from damage caused by media backflow and leakage, reducing accident risks and maintenance costs.
