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J-VALVES
Design Features
Carbon Steel Construction: Valve body and bonnet are cast or forged from high-quality carbon steel such as ASTM A216 WCB, A105 or Q235, featuring high mechanical strength, good weldability and cost efficiency. Suitable for non-corrosive media including water, steam and petroleum products.
Outside Screw & Yoke (OS&Y): Stem threads are located outside the bonnet, providing clear visual indication of open/closed status and easy lubrication and maintenance, ideal for outdoor and critical services.
Non-Rising Stem (NRS): Stem threads are housed inside the body cavity, offering a compact structure suitable for buried or underground installations with limited space.
Flexible Wedge: An integral flexible slot is machined in the middle of the wedge, enabling self-energized sealing between the wedge and seats under media pressure, compensating for thermal expansion and minor deformations with excellent sealing performance.
Rigid Wedge: Solid or double disc design, suitable for high-temperature, high-pressure or particle-laden media, providing reliable shut-off with metal-to-metal sealing.
Flanged or Butt-Weld Ends: Large-diameter flanged ends comply with ASME B16.5 / EN 1092 for easy installation and maintenance; butt-weld ends are used in high-pressure or critical pipelines to minimize potential leakage points.
Full Bore Low Flow Resistance Design: When fully open, the wedge is completely lifted out of the flow passage, resulting in an extremely low flow resistance coefficient (Kv/Cv value close to that of straight pipe), low pressure drop and obvious energy-saving effect.
Blowout-Proof Stem & Back Seat: OS&Y design is equipped with anti-blowout shoulder. In full open position, the stem boss engages with the bonnet back seat, allowing online packing replacement and improving maintenance safety.
Guiding & Supporting Structure: Large-diameter wedges are fitted with upper and lower guide rails or ribs to ensure stable alignment during operation, preventing jamming and vibration, especially suitable for large-bore high differential pressure conditions.
Optional Bypass & Pressure Relief: Sizes DN600 and above can be equipped with bypass valves or pressure balancing holes to equalize differential pressure across the valve, reduce operating torque and protect sealing surfaces.
Multiple Actuation Options: Standard with handwheel or bevel gear operation; large-bore high-pressure models can be fitted with electric, pneumatic or hydraulic actuators for remote control and automated operation.
Technical Specifications
Size Range: NPS 2″ to 60″ (DN50 to DN1500)
Pressure Class: Class 150, Class 300 (PN10, PN16, PN25, PN40)
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A216 WCB, A105, Q235, 20# steel
Wedge: WCB with 13Cr overlay, CF8/CF8M, 2Cr13, flexible composite wedge
Stem: 2Cr13, SS304, SS316, 17-4PH
Seat: 13Cr / Stellite overlay, CF8/CF8M, brass (for low-pressure water service)
Sealing Surfaces: 13Cr, Stellite alloy, carbide, rubber (EPDM/NBR for water service)
End Connections: Flanged (RF/FF/RTJ), Butt-Weld (BW), Socket-Weld (SW)
Operation: Manual (handwheel / bevel gear), electric, pneumatic, hydraulic, electro-hydraulic
Design Standards: API 600, API 6D, ASME B16.34
Testing Standard: API 598
Face-to-Face Dimensions: ASME B16.10
Applications
Water Conservancy Projects: Large-flow isolation control for intake/outlet, bypass pipes and flood discharge systems of reservoirs, hydropower stations and diversion projects.
Thermal Power Generation: On/off control for cooling water systems, circulating water systems, boiler feedwater and steam pipelines.
Petrochemical Industry: Large-bore pipelines for oil products and chemical media in refineries and chemical plants, as well as tank inlet/outlet isolation.
Long-Distance Pipelines: Line block valves and pig launcher/receiver isolation valves for crude oil, refined oil and natural gas pipelines.
Shipbuilding & Offshore Engineering: Large-diameter sea valves for seawater cooling, ballast water and bilge water systems.
Metallurgy & Mining: Large-flow media control for blast furnace cooling water, circulating water and slurry transportation systems.
Advantages & Value
High Flow & Low Energy Consumption: Full bore design provides minimal flow resistance, greatly reducing pumping energy consumption for large-flow long-term operation.
Reliable & Durable: Economical carbon steel construction, flexible wedge or metal hard seal design adapts to various media and temperature conditions, with a design service life of more than 30 years.
Easy Maintenance: OS&Y design offers visual status indication, flanged ends allow convenient assembly and disassembly, and back seat design enables online maintenance, reducing downtime.
Strong Adaptability: Various configurations (OS&Y/NRS, flexible/rigid wedge), actuation methods and sealing materials are available to cover a wide range of working conditions.
Remarkable Cost Efficiency: Large-diameter carbon steel gate valves significantly reduce procurement costs compared with alloy valves, while ensuring reliable control for general industrial media.
Standardization & Customization: Compliant with major international standards for interchangeability; customized designs are available for non-standard sizes, special coatings (e.g., coal tar epoxy for buried anti-corrosion) and extension stems.
