Reducing Tee
A reducing tee, also known as a reducer tee, is a specialized pipe fitting used in industrial piping systems for maintaining the main pipe diameter while reducing the branch pipe diameter for flow diversion. Its structure features two ends with identical main pipe diameters and a middle branch with a reduced diameter. Its core function is to tap smaller-diameter branch lines without altering the flow capacity of the main pipeline, enabling gradual flow distribution, pressure reduction, and diameter-change connection throughout the pipe network. The product is manufactured using mature processes such as hot-pressed seamless push forming, hydraulic bulging, integral forging, and steel plate rolling and welding. It is formed in one piece with smooth flow channels and distributed stress, effectively avoiding problems caused by on-site installation of reducers, such as multiple weld joints, high resistance, susceptibility to leakage, and large space occupation. The full range covers materials including carbon steel, stainless steel, alloy steel, and duplex steel, with a nominal diameter range of DN15–DN2000 and a complete selection of reduction ratios, supporting standard, large-span, and non-standard special reduction customization. The product strictly complies with standards such as GB/T12459, GB/T13401, and ASME B16.9, and is widely used in municipal pipe networks, district heating, power plants, petrochemical and chemical industries, mining and metallurgy, HVAC and fire protection, and clean process piping.
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Straight Tee
A straight tee, also known as a T-shaped tee, is the most common standard pipe fitting in industrial and civil piping systems. It is used to achieve a 90° vertical branch from the main pipeline, enabling functions such as flow splitting, flow merging, bypass, drainage, and sampling. The product features a straight-through main run with a vertically branched outlet, a well-regulated flow passage, low resistance, and low stress concentration, ensuring stable system operation. Guojie straight tees cover both equal-diameter and reducing types, and are manufactured using mature processes such as hot-pressed seamless forming, hydraulic bulging, integral forging, and plate-rolled welding. The nominal diameter range covers DN15-DN2000, and available materials include carbon steel, stainless steel, alloy steel, duplex steel, and cast iron. The fittings are suitable for conditions ranging from normal pressure to ultra-high pressure, and support special functional upgrades such as wear resistance, thermal insulation, anti-corrosion, and hygienic grade. The products strictly comply with domestic and international standards including GB/T12459, GB/T13401, and ASME B16.9, and are widely used in municipal water supply and drainage, district heating, power plants, petrochemical, mining and metallurgy, HVAC and fire protection, and clean process piping applications. We offer full-size stock and customization services; please feel free to contact us to confirm specific configurations.
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Y-branch
The oblique tee, also known as the lateral tee or 45° oblique tee, is a special pipe fitting used in industrial piping systems for low-resistance, smooth flow diversion. Compared with the 90° straight tee, the oblique tee adopts a 45° inclined branch design, and some non-standard versions can be made with a 30° or 60° inclination angle, allowing the main pipe fluid to be smoothly diverted into the branch line laterally, significantly reducing fluid turning impact, turbulent disturbance, and local pressure drop. The product is integrally formed through hot-pressed seamless push forming, hydraulic bulging, integral forging, or steel plate rolling and welding processes, with smooth flow channel transitions and no right-angle dead corners, effectively solving problems such as gas accumulation, liquid accumulation, vortex erosion, and local wear in high-speed fluid, slurry medium, and gas pipelines. The full range covers carbon steel, stainless steel, alloy steel, and duplex steel materials, with nominal diameters from DN15 to DN2000, including both equal-diameter and reducing structures, and supports high-pressure thickened, wear-resistant, insulated, anti-corrosion, and sanitary-grade customization. The product strictly complies with standards such as GB/T12459, GB/T13401, ASME B16.9, SH/T3408, and HG/T21635, and is widely used in municipal drainage, long-distance thermal pipelines, electric power, petrochemical, mining slurry, HVAC gas, and sewage treatment fields. We provide free product selection and technical support, and you are welcome to contact us to confirm the specific configuration.
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Y-type tee
A Y-Type Tee (Y-Joint) is a core pipe fitting in industrial piping systems, featuring an overall Y-shaped oblique tee structure. Compared with a right-angle straight tee, it has a smooth flow path, low resistance, no dead zones for material accumulation, and is less prone to pipe blockage. The product is mainly used for flow splitting, merging, and bypass switching of pipeline media, and is suitable for gases, liquids, oils, powders, steam, and corrosive media. Thanks to its streamlined design, it effectively reduces turbulence, noise, and pressure loss, and is widely used in petroleum, chemical, power, gas, HVAC, wastewater treatment, mining, and pneumatic conveying industries. We offer a variety of materials including carbon steel, stainless steel, duplex steel, and alloy steel, and support non-standard customization such as full-bore, reducing, eccentric, and extended straight-run configurations, as well as anti-corrosion treatments including sandblasting, galvanizing, and plastic-lined or fluoropolymer-lined finishes. Every product undergoes strict inspection before leaving the factory, comes with a 12-month warranty, and we provide selection guidance and technical support. Whether for domestic projects or overseas exports, we can offer flexible supply solutions based on project requirements.
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Double-branch tee
The double-branch tee (Y-type tee) is a key fitting in industrial piping systems, used to achieve medium flow splitting, merging, and bypass switching. The product adopts an integrated hot-press forming process and a streamlined inclined structure design. Compared with traditional right-angle tees, the fluid channel is smoother, which can effectively reduce pipeline resistance and pressure loss. It also has no internal dead zones for material accumulation, thoroughly solving the industry-wide problem of clogging and residual buildup when conveying powders, granules, and viscous media. The product covers a nominal diameter range of DN15-DN800, supports mainstream angles such as 45°, 120°, and 135° as well as non-standard angle customization, and is compatible with multiple materials including carbon steel, stainless steel, alloy steel, and duplex steel. It covers all pressure ratings from low pressure, medium pressure, to high pressure, and is manufactured strictly in accordance with international standards such as Chinese national standards (GB), American standards (ASTM/ANSI), and German standards (DIN). It supports multiple connection methods including butt welding, socket welding, threaded, and flanged connections, and is suitable for water, oil, gas, steam, powders, and acid-alkali corrosive media. It is widely used in petrochemical, power and thermal, gas municipal, wastewater treatment, mining powder, HVAC, and marine industries. The factory has ample stock, supports small trial orders and large-volume customization, and every product undergoes strict pressure testing and non-destructive testing before shipment. With stable quality and comprehensive warranty, it is the preferred fitting for industrial pipeline splitting/merging retrofits and new construction projects.
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Butt Weld Tee BW
BW Butt Weld Tee adopts an integrated hot-press forming process with end bevel design. After welding, it fuses seamlessly with the pipeline, providing strong sealing performance and no risk of leakage. The product covers DN15-DN1200, with wall thicknesses including STD, SCH40, SCH80, and SCH160. Materials include carbon steel, stainless steel, alloy steel, duplex steel, etc., meeting the requirements of different working conditions. It strictly complies with GB/T12459 and ASME B16.9 standards, and is widely used in high-pressure pipeline systems such as petrochemical, power and thermal energy, natural gas, coal chemical, and municipal pipeline networks. We offer both equal-diameter and reducing structures, and support non-standard customization, including special materials, wall thicknesses, diameters, and surface treatments, along with complete inspection and after-sales support.
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Socket Weld Tee SW
Socket Weld Tee (SW) belongs to forged high-pressure pipe fittings. It uses round steel as the forging blank, which is machined to form the socket. After the pipe is inserted, it is connected by fillet welding around the circumference. It is suitable for small-bore high-pressure piping systems ranging from DN6 to DN100. The product complies with ASME B16.11 and GB/T14383-2021 standards, with pressure classes including 3000LB, 6000LB, and 9000LB, and can meet severe working conditions such as high temperature, high pressure, and flammable or explosive environments. Materials cover A105 carbon steel, 304/316L stainless steel, alloy steel, and duplex steel. The structure is divided into two types: equal-diameter and reducing. The socket weld connection method offers easy installation and precise alignment, effectively avoiding misalignment issues. It is widely used in process piping, instrument sampling, and bypass branches in industries such as petrochemical, power, marine, and fire protection. We provide comprehensive customization services, supporting non-standard sizes, special materials, and surface treatments, and ensure that every product undergoes strict inspection before leaving the factory.
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Threaded Tee
Threaded Tee is a forged threaded high-pressure pipe fitting, fully formed through integral forging process, requiring no welding, easy to install, flexible to assemble and disassemble, and is the most commonly used branch connection fitting for small-diameter pipelines. Both ends and the side outlet of the product adopt precision internal thread structures. Mainstream threads include NPT American standard taper thread, BSPP/BSPT British pipe thread, and ZG taper pipe thread, compatible with global piping standards. Specifications cover DN6-DN100 (1/8"-4"), pressure ratings include 2000LB, 3000LB, 6000LB, and 9000LB, with wall thicknesses corresponding to SCH40, SCH80, and SCH160. Materials cover carbon steel A105, 20# steel, 304/316L stainless steel, alloy steel, and duplex steel. It is divided into two main structures: equal-diameter threaded tee and reducing threaded tee, enabling pipeline diversion, confluence, bypass, sampling, and drainage branch functions. The product strictly complies with ASME B16.11, GB/T14383, and MSS-SP-79 standards, featuring high thread precision, good sealing performance, pressure resistance, vibration resistance, and leak resistance. It is widely used in instrument pipelines, hydraulic piping, fire protection, gas, plumbing, petrochemical, and power equipment supporting applications, and is a quick-install fitting.
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Flange Tee FL
Flange tee FL, abbreviated as FL tee, has flanges on all three ends. The detachable connection is completed by bolts and gaskets. It is the core branch fitting of large-diameter detachable pipeline systems. The main body is formed by seamless hot pressing or rolled welding. The two ends and the branch pipe are welded with flanges to form an integrated three-flange structure. The product realizes medium diversion, confluence, bypass, and branch reservation in pipelines. It is convenient for disassembly, assembly, inspection, and maintenance. In later stages, pipeline disassembly, valve replacement, and equipment maintenance can be performed without cutting pipes. The specification range covers DN15 to DN2000, pressure ratings from PN10 to PN160 and Class150 to Class2500. Flange sealing faces include RF, FF, MFM, TG, RTJ and other forms. Materials include carbon steel A234 WPB, stainless steel 304/316L, alloy steel, and duplex steel. It is divided into two main structural types: flange equal tee and flange reducing tee. The main body complies with ASME B16.9 and GB/T12459, and the flanges comply with ASME B16.5 and GB/T9113 standards. It is widely used in petrochemical, power plant thermal, municipal utility tunnels, water treatment, natural gas, marine and shipbuilding industries, and is especially suitable for occasions requiring frequent maintenance, equipment connection, and large-diameter process pipelines.
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