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J-VALVES
Structural Features
Low Alloy Steel Material: The valve body is made of low alloy steels such as ASTM A217 WC6 (1.25Cr‑0.5Mo), WC9 (2.25Cr‑1Mo), C5/C12 (5Cr‑0.5Mo/9Cr‑1Mo) or ASTM A182 F11/F22/F91, featuring excellent high‑temperature strength, creep resistance, oxidation resistance and good weldability. It is suitable for high‑temperature and high‑pressure conditions and offers better cost‑effectiveness than stainless steel.
Large‑Bore Medium‑to‑High Pressure Size: DN400 (16") large bore with PN63 (Class 400) pressure rating meets shut‑off and control requirements for large‑flow, medium‑to‑high pressure pipelines, suitable for main lines and critical process nodes.
Flanged Connection: RF (Raised Face) or RTJ (Ring Type Joint) flanged connections in accordance with EN 1092‑1/GB/T 9113 (PN63) or ASME B16.5 (Class 400), ensuring reliable installation and sealing under medium‑to‑high pressure conditions.
Metal Hard Seal or Composite Seal: Metal‑to‑metal hard sealing is used for high‑temperature service, with seat sealing surfaces hardfaced with STL (Stellite alloy) or nickel‑based hard alloy. For medium‑low temperature conditions, reinforced PTFE or PEEK soft sealing can be applied to achieve zero leakage.
Fire‑Safe Design: Complies with API 607/API 6FA standards. The metal sealing structure maintains sealing performance in case of fire to prevent medium leakage.
Anti‑Static Device: Built‑in anti‑static spring and steel ball effectively conduct static electricity between the ball, stem and body, reducing fire and explosion risks and meeting requirements for hazardous areas.
Blowout‑Proof Stem Design: The stem adopts a bottom‑mounted blowout‑proof structure with shaft shoulders and retaining rings, preventing the stem from being blown out by abnormal internal pressure and ensuring operational safety.
Emergency Seal Grease Injection: Grease injection valves are installed at the seat area. In emergency situations, sealing grease can be injected to restore temporary sealing and extend the valve’s emergency service life.
Drain and Pressure Relief Ports: A drain port is provided at the bottom of the valve body for removing sediments and impurities. An automatic or manual pressure relief device is installed in the valve cavity to prevent valve damage from abnormal pressure buildup.
Technical Parameters
Nominal Size: DN400 (16")
Pressure Rating: PN63 (ANSI Class 400)
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A217 WC6, WC9, C5, C12, C12A; ASTM A182 F11, F22, F91
Ball: A182 F11 with STL hardfacing, F22 with STL hardfacing, F316 with STL hardfacing, F316 with tungsten carbide coating
Stem: A182 F6a, F316, 17‑4PH, Inconel 718, XM‑19 (Nitronic 50)
Seat Seal: Metal hard seal (STL6/STL21/nickel‑based alloy hardfacing, high‑temperature type); reinforced PTFE, PEEK, NYLON (medium‑low temperature type)
Bearing/Bushing: Stainless steel + graphite, copper alloy + graphite, self‑lubricating composite material
Spring/Disc Spring: Inconel X‑750, 17‑7PH, Hastelloy (high‑temperature type)
O‑Ring: Perfluoroether rubber (FFKM, high‑temperature type)
Packing: Flexible graphite, graphite reinforced with nickel wire, high‑temperature ceramic fiber (ultra‑high temperature type)
Gasket: Flexible graphite spiral wound gasket (304/316), metal ring gasket (RTJ, soft iron, 304, 316)
End Connection: Flanged (RF/RTJ) in accordance with EN 1092‑1, GB/T 9113, ASME B16.5; butt‑welded (BW) available as an option
Operation: Manual (heavy‑duty worm gear), pneumatic (double‑acting/single‑acting spring return, high‑torque type), electric (multi‑turn), hydraulic, pneumatic‑hydraulic
Design Standard: API 6D, API 608, ASME B16.34
Test Standard: API 6D, API 598
Application Fields
Coal Chemical Industry: Used in high‑temperature and high‑pressure syngas, water gas and coal‑oil slurry systems for coal gasification, coal‑to‑liquid, coal‑to‑olefins and other units.
Metallurgical Industry: Applied in blast furnace gas, converter gas, coke oven gas systems, as well as high‑temperature gas pipelines of hot blast stoves and heating furnaces, resistant to dust‑containing high‑temperature gas.
Industrial Boiler Systems: Used in steam and feedwater systems of large industrial boilers, as well as waste heat recovery systems.
General Industrial Applications: Suitable for large‑flow control and reliable isolation of high‑temperature steam, hot oil, high‑temperature gas and other media, serving as key shut‑off equipment for high‑temperature and high‑pressure pipelines.
Advantages and Value
High‑Temperature and High‑Pressure Adaptability: Low alloy steels such as WC6/WC9/C12A provide excellent high‑temperature strength and creep resistance, with long‑term service temperatures up to 593℃‑650℃, meeting ultra‑high‑temperature and high‑pressure requirements.
Large‑Bore Medium‑to‑High Pressure Reliability: DN400 large bore with trunnion‑mounted ball design ensures stable and controllable operating torque, optimized for medium‑pressure and large‑flow conditions with reliable operation.
Excellent Cost‑Effectiveness: Low alloy steel costs significantly less than stainless steel and high‑temperature alloys while meeting high‑temperature strength requirements, achieving an optimal balance between performance and cost.
Stable Operating Torque: The trunnion‑mounted ball design makes operating torque unaffected by medium pressure fluctuations, facilitating accurate selection of heavy‑duty actuators, stable operation and extended actuator service life.
High System Safety: Multiple safety designs including DBB double block‑and‑bleed, fire‑safe, anti‑static, blowout‑proof, emergency grease injection and automatic pressure relief meet requirements for hazardous areas and critical pipeline isolation.
Convenient Online Maintenance: Two‑piece or three‑piece structure allows trim replacement without removing the valve from the pipeline. Drain and pressure relief ports facilitate routine maintenance and troubleshooting, reducing system downtime.
Flexible Automation Upgrade: Large‑size ISO 5211 top flange adapts to various high‑torque pneumatic, electric and hydraulic actuators, enabling remote control and intelligent upgrading.
Wide Application Range: A variety of low alloy steel materials and sealing types are available, covering a wide range of conditions from ambient temperature to 650℃ ultra‑high temperature, and from clean steam to erosive media containing particles.
Compliance with International Standards: Designed and manufactured in strict accordance with API 6D, ASME, EN, ISO, GB and other international standards to meet global project procurement requirements. Complete material certification (EN 10204 3.1/3.2), high‑temperature tensile test reports, metallographic analysis reports, NACE compliance certificates and fire‑safe certifications are provided.
