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J-VALVES
Construction Features
Stainless Steel Material: The valve body is made of precision cast or forged stainless steel including CF8 (304), CF8M (316), CF3 (304L), CF3M (316L), etc., featuring excellent corrosion resistance to meet service conditions ranging from mildly corrosive to highly corrosive media.
Optional Structures: Straight Pattern / Angle Pattern / Y-Pattern
Straight Pattern (T-type): The most common structure with moderate flow resistance, suitable for general working conditions.
Angle Pattern (90° type): Changes flow direction by 90°, simplifies piping layout and saves elbows.
Y-Pattern (Oblique Stem Type): The flow passage is inclined in a Y-shape with flow resistance close to that of gate valves, ideal for high pressure differential and low flow resistance applications.
Precise Fit of Disc and Seat: The disc is replaceable. Hard metal sealing is achieved by hardfacing Stellite alloy on the sealing surfaces or using integral stainless steel; zero leakage is realized with embedded soft sealing materials such as PTFE and PPL.
Rising Stem Design: The stem drives the disc to lift vertically, featuring short opening/closing stroke and stable operating torque, suitable for frequent regulation services.
Optional Bellow Seal: The stem is equipped with a metal bellows seal to achieve zero external leakage at the stem, meeting requirements for toxic, flammable, valuable media or strict environmental regulations.
Back Seat Design: A metal seal is formed between the stem and bonnet at the full-open position, allowing online packing replacement and improving system availability.
Handwheel / Actuator Operation: Standard with handwheel operation; can be fitted with gear operators, pneumatic, electric or hydraulic actuators for remote control and automation.
Clear Flow Direction Indication: Flow arrow is cast on the valve body to ensure correct installation with low inlet and high outlet, optimizing sealing performance and service life.
Technical Parameters
Size Range: 1/2″ to 24″ (DN15 to DN600)
Pressure Class: 150LB to 2500LB (PN20 to PN420)
Temperature Range: -29℃ to +425℃
Materials
Valve Body: CF8, CF8M, CF3, CF3M, CK20, CN7M (Alloy 20)
Disc / Seat: CF8+Stellite, CF8M+Stellite, SS316, SS316L, Monel, Hastelloy
Stem: SS304, SS316, SS316L, 17-4PH, XM-19
Packing: PTFE, flexible graphite, braided graphite, low-temperature graphite
Gaskets: Spiral-wound gaskets (304/316 + graphite), metal ring gaskets (octagonal, oval)
End Connections
Flanged: RF, RTJ, FM, conforming to ASME B16.5
Welded: BW (Butt Weld), SW (Socket Weld)
Threaded: NPT, BSP (small bore)
Operation: Handwheel, impact handwheel, gear operator, pneumatic, electric, hydraulic
Design Standards: ASME B16.34, API 602, BS 1873
Testing Standards: API 598, API 6D
Face-to-Face Dimensions: ASME B16.10
Applications
Chemical Industry: Precise regulation and reliable shut-off of acids, alkalis, salts, organic solvents and polymer fluids, protecting reactors and downstream equipment.
Petroleum Refining: Control of high-temperature, high-pressure oil and gas in atmospheric and vacuum distillation, catalytic cracking and hydrogenation units.
Pharmaceutical Industry: Compliant with GMP and FDA requirements, used for regulating clean steam and process media in API and formulation production; bellows seal type ensures zero contamination.
Food and Beverage: Hygienic control in CIP/SIP cleaning systems, syrup and dairy pipelines; 316L material meets 3A standards.
Marine and Shipbuilding: Seawater cooling systems, ballast water systems and bilge water systems; CF8M material resists seawater corrosion.
Power Industry: High-temperature and high-pressure regulation in boiler feedwater, main steam and extraction systems; forged valve bodies comply with ASME Section I boiler codes.
LNG and Cryogenic Engineering: CF8/CF3M material with extended bonnet, suitable for cryogenic media such as LNG, LOX and LIN at -196℃.
Environmental Protection and Water Treatment: Control of corrosive media in sewage treatment, reclaimed water reuse and flue gas desulfurization systems.
Paper Industry: Regulation and isolation of black liquor, white liquor and bleaching chemicals, resistant to highly corrosive environments.
Advantages and Value
Excellent Regulation Performance: Linear motion between disc and seat, combined with different cone angle designs, delivers equal-percentage or linear flow characteristics to meet precise process control requirements.
High Sealing Reliability: Metal sealing withstands high temperature and pressure; soft sealing achieves Class VI zero leakage; bellows option completely eliminates stem external leakage risk.
Wide Material Compatibility: Full series of stainless steels including 304/316/316L/Alloy 20, covering a complete range of conditions from mild to strong corrosion and low to high temperature.
Economical and Convenient Maintenance: Disc and seat can be replaced individually without full valve removal; back seat design allows pressurized packing replacement.
Strong Standard Compatibility: Complies with major global standards including ASME, API, ISO and GB, facilitating design, selection and procurement for international projects.
