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J-VALVES
Structural Features
One‑piece forged valve body: The valve body is integrally forged from materials including ASTM A105, A350 LF2 or A182 F304/F316. It features a dense grain structure free from casting defects, delivering outstanding mechanical strength, toughness and pressure‑bearing capacity for critical working conditions and high‑pressure‑differential applications.
Small‑bore low‑pressure specification: The DN40 (1‑1/2‑inch) nominal size paired with PN20 (Class 150) pressure rating meets shut‑off and flow‑regulation demands for low‑flow systems. Boasting compact construction and lightweight build, the valve enables hassle‑free installation.
Flanged connection: Raised‑face (RF) flanged ends comply with EN 1092‑1 and ASME B16.5 standards. The design facilitates integration with existing pipeline circuits, straightforward fitting, disassembly and routine maintenance.
OS&Y (Outside Screw and Yoke) stem configuration: The stem threads sit outside the valve body and remain fully isolated from process media to avoid corrosion and contamination. The yoke bears the stem nut for stable operating torque. Visible stem travel provides instant readout of valve open‑close status and opening degree.
Back‑seat sealing structure: A metal‑to‑metal seal is formed between the stem and bonnet when the valve is fully opened. This permits in‑situ packing replacement without system depressurization and cuts down on plant downtime.
Anti‑blow‑out stem construction: The top‑mounted anti‑blow‑out assembly with shaft shoulder and retaining ring stops the stem from being ejected under abnormal internal pressure and safeguards operational safety.
Flexible graphite or PTFE packing: High‑purity flexible graphite packing offers a broad working temperature range of ‑200 °C to +600 °C and favourable self‑lubricating property. PTFE packing is an alternative option for low‑temperature or corrosive‑service conditions with premium sealing performance.
Compact and lightweight layout: The small‑bore forged‑type body occupies minimal space and weighs little. It suits confined installation spaces and reduces expenditure on pipeline supports.
Technical Specifications
Nominal Size: DN40 (1‑1/2 inch)
Pressure Rating: PN20 (Class 150)
Operating Temperature Range: ‑29 °C to +425 °C
Valve Body & Bonnet: ASTM A105 (standard version), A350 LF2 (low‑temperature version), A182 F304/F316 (stainless‑steel version)
Disc & Seat: A105 with Stellite‑6 hardfacing, F304 with Stellite‑6 hardfacing, F316 with Stellite‑6 hardfacing, solid Stellite‑6
Stem Material: F6a, F304, F316, 17‑4PH, XM‑19 (Nitronic 50)
Seating Surface: Stellite 6, Stellite 21, nickel‑based alloy, hard‑faced alloy
Packing: Flexible graphite, PTFE, graphite with nickel‑wire reinforcement
Gasket: 304/316 stainless‑steel flexible graphite spiral‑wound gasket, non‑asbestos fibre gasket, PTFE‑encapsulated gasket
End Connection: Raised‑face flange (RF, EN 1092‑1 / ASME B16.5); socket‑weld (SW), butt‑weld (BW), threaded (NPT/BSP) connections optional
Actuation Mode: Hand‑operated handwheel, gearbox (bevel‑gear / worm‑gear for high‑torque service), linear‑stroke pneumatic actuator, multi‑turn electric actuator
Design Standards: API 602, ASME B16.34, BS 1873
Inspection and Test Standard: API 598
Application Fields
Oil and Gas Industry: Process‑pipeline shut‑off and flow regulation for surface facilities, gathering stations and metering stations. Adaptable to sour‑gas environments containing hydrogen sulphide and carbon dioxide.
Chemical and Petrochemical Sector: Inlet‑outlet flow control for reaction kettles, heat exchangers and separators, alongside precise flow modulation for sampling loops and chemical‑injection systems.
Marine and Offshore Engineering: Medium regulation for seawater cooling, fire‑fighting, bilge and fuel‑oil pipelines, compliant with classification society certification requirements.
General‑Industrial Service: Reliable shut‑off and flow adjustment for water, steam, oil products and gaseous media, acting as the standard control component for small‑bore low‑pressure pipelines.
Advantages and Core Values
High‑strength forged construction: Integral forging yields compact grain texture without casting flaws such as shrinkage cavities and blowholes. Its superior mechanical properties enable greater pressure endurance than cast valves of identical dimensions for demanding process duties.
Accurate throttling capability: The tapered or needle‑style disc together with the guide assembly yields stable flow characteristics and high throttling precision to satisfy sophisticated process‑control requirements.
Cost‑effective low‑pressure solution: The PN20‑rated forged body features optimised wall thickness and reduced weight, delivering excellent cost‑performance for extensive low‑pressure applications.
Safe and dependable operation: The OS&Y design supplies clear stem‑position indication, while anti‑blow‑out and back‑seat sealing configurations enhance safety during operation and maintenance.
User‑friendly installation and servicing: Flanged ends simplify fitting and overhaul. Back‑seat sealing permits packing replacement under working pressure. The compact build lowers the load‑bearing expense for pipe supports.
Easy automation compatibility: Linear‑stroke pneumatic or electric actuators can be mounted directly. Equipped with positioners, the valve executes precise 4‑20 mA throttling control and seamlessly interfaces with distributed‑control systems.
Wide‑ranging service adaptability: Multiple forged alloys, seating‑surface materials and end‑connection selections accommodate working scenarios spanning cryogenic to high‑temperature conditions and clean through corrosive process fluids.
International‑standard compliance: Designed and manufactured in accordance with API 602, ASME, EN, ISO, DIN and other worldwide specifications to meet procurement standards for global‑scale projects. Full material certifications (EN 10204 3.1/3.2), inspection reports and NACE compliance documents are supplied.
