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J-VALVES
One-piece Forged Body: Manufactured from high-quality forged steel materials such as ASTM A105, A350 LF2, A182 F304/F316/F316L, featuring uniform and dense microstructure. Its pressure-bearing capacity is significantly higher than cast valves, with no risk of casting defects.
Socket-Welded End Connections: The valve body ends are machined with socket bores. Pipes are inserted and connected by fillet welding, forming a permanent joint with equal strength to the pipeline, free ofleakage points, and offering excellent resistance to vibration and fatigue.
Compact Design: Short face-to-face dimension, small volume and light weight, suitable for installation in space‑limited locations such as equipment nozzles, instrument panels and densely arranged pipe racks.
Unitized Bonnet Structure: The valve body and bonnet are connected by threads or welding, eliminating themiddle flange seal and further reducing the risk of external leakage. It is suitable for flammable, explosive and toxic media.
Precision Lapped Disc & Seat: Sealing surfaces are processed by CNC machining and hand lapping, with surface roughness Ra ≤ 0.4μm, achieving high-performance shut-off with either metal hard seal or soft seal.
Rising Stem Design: The stem drives the disc in vertical motion with short opening and closing stroke and fast operation response, ideal for frequent regulation and quick shut-off services.
Live-Loaded Packing System:PTFE or flexible graphite packing preloaded by disc springs automatically compensates for packing relaxation caused by thermal cycling, ensuring long-term sealing reliability.
Back Seat Design:A metal seal is formed between the stem and bonnet in the full-open position, allowing online packing replacement and improving continuous operation of the system.
Optional Disc Types
Flat Disc: General-purpose, suitable for clean media.
Conical Disc: Line-contact sealing with low closing force and excellent sealing performance.
Needle Disc: Slender taper for precise small-flow regulation (e.g., instrument root valves).
V-Port Throttling Disc: Special profile provides equal-percentage flow characteristics for high pressure-differential regulation.
Optional Extended Bonnet: Used in low-temperature or high-temperature services to protect packing from extreme temperatures and ensure operational flexibility.
Size Range: 1/4″ to 2″ (DN8 to DN50); commonly used: 1/4″, 1/2″, 3/4″, 1″ (DN8, DN15, DN20, DN25)
Pressure Class: 800LB to 2500LB (PN130 to PN420); standard classes: Class 800, 1500, 2500
Temperature Range: -29℃ to +425℃
Materials
Body / Bonnet: A105, A350 LF2/LF3, A182 F304/F316/F316L/F321/F347, A182 F11/F22 (alloy steel)
Disc / Seat: A105+Stellite, F304/F316, F316L, 17-4PH, solid Stellite 6/12
Stem: SS304, SS316, SS316L, 17-4PH, XM-19, Inconel 718
Packing: PTFE V-rings, flexible graphite, braided graphite, low-temperature graphite, nuclear-grade graphite
Gaskets: Integral metal seal (threaded connection) or spiral-wound gasket (welded bonnet)
End Connections: Socket Weld (SW) per ASME B16.11; optional Butt Weld (BW) or NPT thread
Operation: Handwheel (standard), square / hex drive (wrench operation), gear operator (large-bore high-pressure), pneumatic / electric (automation)
Design Standards: ASME B16.34, API 602
Testing Standard: API 598
Socket Bore Dimensions: ASME B16.11
High-Pressure Instrument Piping: Root valves and isolation valves for pressure gauges, transmitters and analytical instruments, resisting high-pressure pulses and vibration.
Sampling Systems: Medium shut-off at online sampling points of process pipelines, ensuring representative sampling and operational safety.
Vents & Pressure Relief Ports: Isolation valves upstream of safety valves and pressure relief valves, or low-point drains and high-point vents of equipment.
Small-Bore Process Piping: Bypass lines for high-pressure heat exchangers, reactors and pumps, and high-pressure shut-off in space-restricted areas.
Steam Power Systems: Small-bore high-pressure regulation and isolation in main steam, extraction and condensate systems, complying with ASME Section I boiler codes.
Hydrocracking / Hydrotreating: Precise control of high-pressure hydrogen and oil products, meeting NACE requirements for resistance to hydrogen embrittlement.
Offshore Platforms & Vessels: Control of high-pressure hydraulic, fuel and fire-fighting systems in compact spaces.
Military & Aerospace: Reliable shut-off for high-pressure propellant and oxidizer pipelines, meeting extreme reliability requirements.
Nuclear Applications: Sampling and instrument systems in the primary circuit of nuclear islands, complying with ASME Section III Class 1 or RCC-M codes (special order).
Excellent Structural Integrity: Forged steel material and socket-welded connections form an integral structure with equivalent strength to the pipeline, free of weak points, and with fatigue life far exceeding flanged valves.
Zero External Leakage Design: Welded ends eliminate gasket seals; welded or metal-sealed bonnets provide a double barrier from process media to the atmosphere.
Outstanding High-Pressure Capability: Dense forged microstructure can withstand ultra-high pressure up to Class 4500, making it the only economical solution for high-pressure small-bore piping.
Optimal Space Efficiency: Saves over 70% of installation space and weight compared with flanged valves, reducing loads on supporting structures and pipe racks.
High Vibration Resistance: The fully welded structure eliminates risks of loose mechanical connections, making it suitable for high-vibration locations such as compressor and pump discharges.
