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J-VALVES
Structural Features
ASTM A105N Normalized Carbon Steel: The valve body adopts normalized carbon steel ASTM A105N with refined grain structure and uniform microstructure, which relieves forging‑induced residual stress. It delivers excellent weldability and machinability, outperforming standard A105 material.
Bellows Seal System: Multi‑layer hydraulically formed stainless‑steel bellows serve as the dynamic stem sealing component.
Dual‑Seal Protection: The bellows acts as the primary seal, while the stuffing box is fitted with flexible graphite packing as backup sealing. Sealing performance is maintained even in the event of accidental bellows failure, delivering maximum safety redundancy.
Ultra‑High‑Pressure Class 800LB: Designed per API 602 for ultra‑high‑pressure service. Wall thickness, bolting and sealing construction are reinforced for severe high‑pressure conditions to ensure reliable isolation for small‑bore high‑pressure systems.
OS&Y (Outside Screw and Yoke) Stem Design: Stem threads reside outside the valve body and are completely isolated from process media. A heavy‑duty yoke supports the stem nut for stable operating torque. Visible stem travel provides direct indication of valve open‑closed position, complying with API 602 requirements.
Pressure‑Seal Bonnet (High‑Pressure Version): For Class 800LB ultra‑high‑pressure service, a pressure‑self‑energized bonnet is applied; sealing performance improves as process pressure rises. The bonnet‑to‑body joint utilizes octagonal metal ring gaskets or lens‑type gaskets for superior tightness.
Socket‑Weld or Butt‑Weld Ends: Socket‑weld (SW, ASME B16.11) or butt‑weld (BW, ASME B16.25) end connections are available. These configurations ensure robust connection for small‑bore ultra‑high‑pressure piping and minimize potential leak points.
Fire‑Safe Construction: Compliant with API 607. Metal‑to‑metal seating retains sealing integrity under fire conditions and prevents secondary hazards caused by flammable media release.
Stem Anti‑Blow‑Out Design: Top‑mounted anti‑blow‑out construction with multiple shoulders and retaining rings prevents stem ejection under abnormal overpressure, securing operational safety.
Back‑Seat Feature: Upon full valve opening, a metal seal forms between stem and bonnet, permitting on‑line packing replacement (backup seal) without system depressurization.
Optional Extended Bonnet: Extended bonnet is selectable for cryogenic or high‑temperature service. It protects bellows and packing assemblies from extreme temperatures to guarantee safe operation and sealing reliability.
Compact Lightweight Construction: Optimized for small‑bore ultra‑high‑pressure applications with compact footprint and low weight. It facilitates installation in space‑constrained locations and reduces piping support costs.
Technical Specifications
Nominal Size: 0.75" (DN20) Pressure Class: Class 800LB (PN130) Temperature Range: -196℃ ~ +425℃
Body / Bonnet: ASTM A105N (Normalized, Standard), A350 LF2 (Cryogenic), A182 F304/F316 (Stainless Steel), A182 F11/F22 (High‑Temperature)
Gate: A105N + ENP (Electroless Nickel Plating), A105N + STL6 Hardfacing, F304, F316
Seat: Body material A105N + STL6 Hardfacing, F304 + STL6 Hardfacing, F316 + STL6 Hardfacing
Stem: F6a, F304, F316, 17‑4PH, Inconel 718, XM‑19 (Nitronic 50)
Bellows: ASTM A240 321, 347, 316L, Inconel 625, Hastelloy C‑276 (Multi‑layer hydraulically formed; wall thickness: 0.15‑0.3 mm; layers: 3‑10)
Packing: Flexible Graphite (Backup Seal), PTFE (Cryogenic Service)
Gaskets: Octagonal / Oval Metal Ring Gaskets (BX/RX, soft iron, 304, 316), Lens‑Type Gaskets, Pressure‑Self‑Energized Sealing Rings
End Connection: Socket‑Weld (SW, ASME B16.11, Standard), Butt‑Weld (BW, ASME B16.25); Flanged (RF/RTJ) optional
Operation: Manual (Handwheel, Standard), Gearbox (Bevel Gear for High Torque), Pneumatic (Linear Stroke), Electric (Multi‑Turn)
Design Standard: API 602, ASME B16.34
Test Standard: API 598
Application Scope
Toxic & Hazardous Media Systems: Reliable isolation for highly toxic media including chlorine, phosgene, hydrogen cyanide, ammonia, hydrogen sulfide and arsine. Absolute zero‑leakage performance safeguards personnel safety.
Flammable & Explosive Media Systems: Used for shut‑off of LPG, LNG, hydrogen, ethylene, propylene, acetylene and other combustible‑explosive fluids, eliminating fire and explosion risks induced by leakage.
High‑Pressure Gas Systems: Provides positive isolation for high‑pressure hydrogen, oxygen, nitrogen, helium, argon and other industrial gases, preventing energy release and personnel injury caused by high‑pressure gas escape.
High‑Value Media Systems: Isolates rare gases, high‑purity chemicals, costly process fluids and catalyst solutions, minimising media loss and improving economic benefits.
Chemical & Petrochemical Industries: Deployed in high‑pressure catalyst injection, additive feeding, toxic solvent and corrosive chemical sampling systems to ensure operational safety.
General Industrial Service: Suitable for reliable isolation in any small‑bore ultra‑high‑pressure system where leakage is prohibited, acting as ultimate zero‑leakage safety barrier.
Advantages & Value Proposition
Absolute Zero‑Leakage Assurance: Bellows sealing fundamentally eliminates all stem dynamic leakage paths. It meets the world’s strictest environmental and safety regulations and avoids catastrophic consequences and legal liabilities arising from toxic‑hazardous media emission.
Optimised for Small‑Bore Ultra‑High‑Pressure Service: Class 800LB rating paired with 0.75‑inch nominal size is optimised for reliable isolation of ultra‑high‑pressure low‑flow systems. It features compact layout, easy installation and outstanding pressure‑bearing capacity.
Wide‑Range Extreme Temperature Compatibility: Metallic bellows withstand extreme service from ‑196 ℃ cryogenic LNG conditions up to +600 ℃ elevated temperature, covering nearly all industrial scenarios including cryogenic and high‑temperature steam applications.
Safe and Stable Operation: OS&Y design offers clear visual stem position indication. Anti‑blow‑out and back‑seat constructions enhance safety for operation and maintenance. Optional extended bonnet protects operators against extreme‑temperature hazards.
Environmental Compliance: Satisfies stringent global emission standards including TA‑Luft, EPA Method 21 and ISO 15848‑1. It prevents environmental penalties and legal risks while improving corporate ESG performance and social responsibility profile.
Broad Application Compatibility: Multiple body materials, bellows alloys and end‑connection options are available, covering working conditions ranging from cryogenic deep‑cold to ultra‑high‑temperature, vacuum to ultra‑high‑pressure, and inert to heavily corrosive service.
International‑Standard Compliance: Designed and manufactured in strict accordance with API 602, ASME, ISO, DIN and other international specifications for global high‑end project procurement. Complete documentation is supplied, including EN 10204 3.1/3.2 material certificates, bellows fatigue test reports, helium mass‑spectrometer leak‑detection records, NACE compliance certificates and environmental approvals.
