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J-VALVES
Design Features
Stainless Steel Construction:Valve body available in CF8 (304), CF8M (316), CF3M (316L) or low-temperature carbon steel LCB/LCC, featuring excellent low-temperature impact resistance, suitable for corrosive and cryogenic media.
Extended Stem Design:Stem length customizable as required, with standard extension ranging from 150mm to 3000mm, positioning the operating unit above ground, on a platform or outside insulation layers, complying with API 6D requirements for buried valves.
Resilient Wedge / Metal Sealing:Resilient wedge (covered with NBR/EPDM) provides self-compensating sealing for bubble-tight shut‑off; metal-seated wedge with Stellite hardfacing is designed for high-temperature and high-pressure services.
Full Bore Design:Straight, unobstructed flow passage ensures extremely low pressure drop and excellent pigging capability, ideal for pipeline cleaning operations and high-viscosity media.
Flanged Connections:RF (Raised Face), RTJ (Ring Type Joint) flanges complying with ASME B16.5/B16.47, pressure ratings Class 150LB to 1500LB.
Stem Protection Structure:Guide brackets or protective sleeves provided for the extended section to prevent stem bending and deformation; bottom drain port designed to remove condensate and impurities.
Cryogenic Service Adaptation:Extended stem keeps the bonnet away from low‑temperature media to avoid packing freezing; vacuum insulation or electric heat tracing can be installed on the stem extension.
Flexible Operation:Handwheel (standard), bevel gearbox, electric actuator, pneumatic/hydraulic actuator, supporting remote control and automation integration.
Position Indication System:Opening indicator mounted on top of the stem; limit switches and position transmitters available as options for remote status monitoring.
Anti‑Static & Fire‑Safe Design:Electrical continuity between body and wedge, stem and body, complying with API 607 fire test requirements.
Technical Specifications
Size Range: 2″ to 48″ (DN50 to DN1200)
Pressure Rating: Class 150LB to 1500LB (PN20 to PN250)
Temperature Range: -29℃ to +425℃
Extended Stem Length: 150mm to 3000mm (standard), custom lengths available
Body: CF8, CF8M, CF3M, CK20 (310), CN7M (Alloy 20), LCB/LCC (low-temperature carbon steel)
Wedge: CF8M with Stellite hardfacing, solid 316 stainless steel, resilient wedge (metal core + rubber covered)
Stem: 316 stainless steel, 17‑4PH, XM‑19, Inconel 718 (for high temperature & pressure)
Seat: Body Stellite hardfacing, insert 316 stainless steel, PTFE/metal composite
Packing: Flexible graphite, low‑temperature graphite, PTFE V‑type set
Gasket: Spiral wound gasket (304/316 + graphite), metallic ring gasket
End Connection: Flanged (RF/RTJ/FF), Butt‑Weld (BW)
Design Standard: ASME B16.34, API 600, API 6D
Test Standard: API 598, API 6D
Face‑to‑Face Dimension: ASME B16.10
Applications
LNG & Natural Gas Industry:Low‑temperature pipelines at LNG terminals, liquefaction plants and vaporization stations. Extended stem locates operating unit away from -162℃ cryogenic zone, preventing freezing injuries and packing failure.
Cryogenic Air Separation Units:Storage, transportation and vaporization systems for liquid oxygen, liquid nitrogen and liquid argon, ensuring reliable sealing and operation under cryogenic conditions.
Chemical & Petrochemical:Low‑temperature storage and transfer of ethylene, propylene, reactor inlet/outlet and low‑temperature separation systems.
Power Industry:Equipment cooling water and essential service water systems in nuclear power plants, pipelines in underground corridors and containment buildings.
Shipbuilding & Offshore Engineering:Cargo systems of LNG carriers and FSRU (Floating Storage and Regasification Unit), meeting deck operation requirements.
Advantages & Value
Safe & Convenient Operation:Extended stem moves the operating unit to a safe area, avoiding personnel contact with cryogenic, high‑temperature or hazardous media, complying with OSHA and API RP 14E safety standards.
Lower Maintenance Cost:Operation and maintenance can be performed without excavation or insulation removal, greatly reducing downtime and earthwork costs.
Reliable Performance in Cryogenic Service:Bonnet kept away from low‑temperature zone maintains packing temperature within operable range, preventing freezing and jamming, ensuring quick response in emergency situations.
Combination of Standardization & Customization:Strictly complies with API 6D and other international standards, while offering flexible customization of stem length, protective sleeve type, operation mode, etc., to meet project‑specific requirements.
Environmental Protection & Compliance:Zero‑leakage design meets EPA low‑emission requirements. Buried installation reduces above‑ground facilities, adapting to urban landscape and environmental protection needs.
