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J-VALVES
Design Features
ASTM A105N Normalized Forged Carbon Steel:The valve body is integrally forged from high‑quality ASTM A105N carbon steel and normalized, resulting in uniform refined grain structure. It offers tensile strength ≥485MPa and yield strength ≥250MPa, with impact toughness significantly superior to conventional A105. It meets the stringent pressure‑retaining requirements of PN160 class (16.0MPa) and is suitable for non‑corrosive ultra‑high‑pressure media including water, oil and gas.
Butt Weld (BW) Connection:The valve body is furnished with butt weld end bevels complying with EN 12627 and ASME B16.25, allowing full‑penetration welding to the pipeline. This eliminates gasket leakage risks inherent in flanged connections. The compact structure is ideal for high‑pressure, high‑temperature, flammable, explosive and toxic services, with welded joints possessing strength equivalent to the base material.
Flexible Wedge Design:The wedge‑type flexible wedge features a central slot or integral flexible structure.
During closure, slight elastic deformation occurs under seat compression, automatically compensating for angular deviations of sealing surfaces to ensure uniform contact and reliable bi‑directional sealing, suitable for ultra‑high‑pressure conditions.
Fire‑Safe Design:Designed in accordance with API 607. Graphite packing and metallic sealing components maintain sealing integrity under fire conditions, preventing media leakage.
Blowout‑Proof Stem:The stem is integrally forged and top‑mounted, equipped with an anti‑blowout shoulder and sealing ring. Even if the packing gland accidentally loosens, the stem remains retained by the bonnet, ensuring operational safety under ultra‑high pressure.
Graphite Packing Seal:The stuffing box uses flexible braided graphite packing or assembled graphite rings, with a wide temperature range from -29℃ to +500℃. It remains flexible at low temperatures and offers excellent self‑lubrication, providing long‑term reliable dynamic stem sealing.
Guide Ribs:Internal guide ribs within the body stabilize the wedge during vertical movement, preventing misalignment, ensuring even loading of sealing surfaces, avoiding galling and scoring, and extending service life.
Compact & Lightweight Design:The face‑to‑face dimension of the DN50 butt‑weld valve is approximately 250mm, with a weight of 8–12kg. Without protruding flanges, it features a compact layout suitable for installation in dense pipe racks and confined equipment spaces.
Technical Parameters
Nominal Size: DN50 (2″)
Pressure Class: PN160 (16.0MPa)
Body Material: ASTM A105N
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A105N
Wedge: A105N with Stellite hardfacing (sealing surfaces) / 13Cr stainless steel
Seat: A105N with Stellite hardfacing (sealing surfaces)
Stem: A276 410 / 420 / 304 / 316 stainless steel, high strength and wear resistance
Packing: Flexible braided graphite / graphite rings / Inconel wire reinforced graphite (high temperature type)
Gasket: Stainless steel spiral wound gasket (316L/flexible graphite filler) / metallic ring gasket
Bolts: ASTM A193 B7 / B7M / B16 (ultra‑high‑pressure high‑strength alloy steel)
Nuts: ASTM A194 2H / 2HM / 7
End Connection: Butt Weld (BW), complying with EN 12627 / ASME B16.25; V‑bevel or U‑bevel selected per wall thickness, full‑penetration welded joints
BW End Dimensions: Comply with EN 10253‑2 / ASME B16.25
Face‑to‑Face: Comply 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
Ultra‑High‑Pressure Hydraulic Systems:Used in DN50 ultra‑high‑pressure water circuits of hydraulic presses, test benches and pressure vessel testing equipment. PN160 rating satisfies 16MPa service pressure, while butt‑weld connections eliminate leakage risks.
High‑Pressure Sections of Natural Gas Transmission Pipelines:Applied in DN50 high‑pressure branch lines, station instrument impulse lines and vent lines of main gas transmission pipelines. Butt‑weld connections ensure zero leakage of high‑pressure natural gas, and A105N material performs well in general corrosive conditions.
Ultra‑High‑Pressure Feedwater Systems in Power Plants:Used in DN50 branches of main steam, reheat steam and high‑pressure feedwater pipelines in supercritical / ultra‑supercritical thermal power plants. Butt‑weld connections ensure zero leakage of high‑temperature and high‑pressure steam.
Oil Drilling & Production Equipment:Installed in DN50 ultra‑high‑pressure manifolds and choke manifolds of wellheads, Christmas trees and fracturing equipment. Butt‑weld connections resist high‑pressure pulsation and vibration, and A105N forged steel offers excellent fatigue resistance.
High‑Pressure Cleaning Equipment:Applied in DN50 ultra‑high‑pressure pump discharge lines of water jet and steam jet cleaning systems. PN160 rating matches pump output pressure, and butt‑weld connections prevent loosening and leakage of flanged joints.
General Industrial Service:Suitable for isolation and shut‑off of DN50 ultra‑high‑pressure water, oil and gas media, especially for non‑corrosive services requiring zero leakage and compact installation.
Advantages & Value
Zero Leakage for Ultra‑High Pressure:Full‑penetration butt‑weld ends eliminate gasket leak paths of flanged connections, achieving permanent zero‑leakage sealing for flammable, explosive, toxic and valuable media under ultra‑high pressure.
Full Bore with Near‑Zero Flow Resistance:When fully open, the wedge retracts into the bonnet, providing a straight, unobstructed flow path with nearly zero pressure loss, reducing pumping energy consumption — ideal as an isolation valve for ultra‑high‑pressure pipelines.
Full‑Strength Welded Joints:Welded joints match the strength of the base material without stress concentration, delivering superior fatigue and vibration resistance compared to flanged connections, suitable for pulsating, vibrating and shock loading.
Safety & Compliance:Fire‑safe and blowout‑proof designs conform to API 607 and high‑pressure equipment safety codes. Welding procedures are qualified to international standards and verified by third‑party testing, protecting personnel and equipment in ultra‑high‑pressure systems.
European Standard Compatibility & Interchangeability:Strictly manufactured in accordance with EN 1092‑1, EN 12516, EN 558 and EN 12627, fully interchangeable with DN50 PN160 butt‑weld gate valves and pipeline components from major European brands, reducing inventory and replacement costs.
Automation Compatibility:Low linear actuation torque supports manual, pneumatic and electric operation, enabling easy integration into DCS/SCADA systems for remote monitoring and automatic isolation.
