Grooved (Clamp) Tee
Groove coupling tee, also known as grooved tee, belongs to the grooved pipe fitting series. It achieves branch pipe connection through the groove formed after pipe rolling, combined with couplings and rubber sealing rings, requiring no welding and no threading throughout the entire process, making installation fast and safe. The main body of the product is mostly cast from QT450-10 ductile iron, and stainless steel material can be selected for some working conditions to enhance corrosion resistance. The sealing ring uses imported EPDM rubber, which is high-temperature resistant and aging resistant, ensuring long-term zero leakage. This product is mainly used in pipeline systems such as fire sprinkler systems, fire water supply, domestic water supply and drainage, and HVAC circulating water, to achieve diversion from the main pipe to branch pipes. Structurally, it is divided into straight tees, reducing tees, and mechanical tees, among which the mechanical tee can be directly opened and side-connected without cutting the main pipe, making it especially suitable for renovation without water shutdown and adding branches to old pipe networks. The product is compatible with grooved rolled pipes such as galvanized steel pipes and seamless steel pipes, and is widely used in fire protection pipeline projects for factories, shopping malls, underground garages, and buildings, meeting fire protection acceptance standards. We provide multiple specifications and customization services, and welcome you to contact us to confirm the specific configuration.
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Press-fit tee
The press-fit tee is a type of stainless steel press-fit pipe fitting, mainly used for branch connections and flow distribution in thin-wall stainless steel pipelines. It relies on a dedicated press-fit tool to squeeze the ends of the fitting, causing the fitting and the pipe to interlock tightly, and works together with EPDM or HNBR sealing rings to achieve a sealed connection—no welding or thread cutting is required throughout the entire process. The main body material is commonly 304 or 316L stainless steel, offering corrosion resistance, hygienic compliance, and a long service life. The product is available in two main configurations: equal-diameter and reducing, and is compatible with national-standard thin-wall stainless steel water pipes. It is widely used in drinking water systems, water purification projects, gas, HVAC, pharmaceutical, food, and building water supply and drainage pipelines. The press-fit connection method allows for fast installation, and the joints are resistant to vibration and pull-out, with stable sealing performance and low risk of leakage. The Guojie brand offers a variety of specifications and supports OEM/ODM customization to meet engineering and foreign trade requirements.
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Hot Press (Hot Push) Seamless Tee
Hot-pressed (hot-extruded) seamless tees belong to steel butt-welded seamless pipe fittings. By heating a seamless pipe blank to a high-temperature plastic state and relying on a die to extrude and push out the branch pipe, the entire fitting is formed in one piece without any welded seams. This process makes the metal structure dense and uniform, keeps wall thickness stable, and significantly improves pressure resistance and high-temperature performance. The product ends are machined with welding bevels and connected to pipelines by butt welding. It is suitable for diversion and collection in high-pressure process pipelines in petroleum, chemical, electric power, heating, natural gas, and other industries. Compared with welded fabricated tees, hot-pressed seamless tees have no hidden defects from weld seams and are a reliable choice for special equipment projects involving pressure pipelines. We offer three major material series: carbon steel, alloy steel, and stainless steel, strictly implement GB/T12459 and ASME B16.9 standards, and can customize non-standard specifications according to project requirements.
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Hydraulic Bulge Forming Tee
Hydraulic bulging tees belong to steel seamless butt-welding pipe fittings. They are integrally formed by the hydraulic bulging process, in which high-pressure liquid inside the pipe blank exerts pressure while external dies guide the plastic flow of the material to directly bulge out the branch pipe, resulting in an overall weld-free structure. Unlike hot-pushed and hot-pressed tees, hydraulic bulging is mostly a cold-forming process, with uniform material deformation, smooth inner and outer surfaces of the fitting, controllable wall-thickness reduction, and high dimensional accuracy. The applicable standards are GB/T 12459 and ASME B16.9, and the materials cover carbon steel, alloy steel, and stainless steel. The product ends are machined with welding bevels and connected by butt-welding (BW). It is widely used in medium- and high-pressure chemical, pharmaceutical, food, and municipal process pipelines, and is especially suitable for the production of stainless steel tees. Due to process limitations, large-diameter and extra-thick-wall fittings are less commonly produced by hydraulic bulging; small- and medium-diameter with medium wall thickness is its advantageous range. The metal structure has no high-temperature oxide scale, and the surface quality is superior to that of the hot-pushing process.
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Plate flat welding flange PL
Plate Slip-On Flange (PL, Plate Slip-On Flange) belongs to steel plate slip-on flanges and is the most commonly used low-pressure flange fitting in industrial pipelines. The flange body is a flat disc structure; the pipe is inserted directly into the flange bore and secured by fillet welds on both the inner and outer sides, without the need for beveled butt welding. The product has a simple production process, low processing cost, and short delivery cycle, and is widely used in medium- and low-pressure working conditions. It implements the standards GB/T9119 and HG/T20592 European standard PN system; the American standard rarely uses PL plate slip-on flanges, and instead mostly uses SO hubbed slip-on flanges. The mainstream sealing face is the RF raised face. Materials include carbon steel, stainless steel, and alloy steel; pressure ratings are PN6-PN40, and it is not suitable for high-temperature, high-pressure, alternating-load, or flammable and explosive high-risk pipelines. It is mostly used in water supply and drainage, fire protection, ordinary heating, and ordinary chemical low-pressure pipelines. The flange bolt holes are evenly distributed according to the standard, and matching gaskets, bolts, and nuts enable detachable connection of the pipeline.
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Slip-on flange with neck SO
The hubbed slip-on flange (SO) is a detachable sealing component used in industrial piping systems to connect pipe to pipe, valves, or equipment. Its body has a short conical neck; after the pipe is inserted into the flange bore, it is fixed by fillet welding. This structure effectively disperses pipe stress, reduces the risk of weld cracking, and offers better overall rigidity and fatigue resistance than the plate slip-on flange. The product complies with HG/T20592 (European PN system) and ASME B16.5 (American Class system) standards, and the sealing face can be provided in RF raised face, MFM male and female face, TG tongue and groove face, and other types. Materials cover carbon steel, alloy steel, and stainless steel, and pressure ratings cover PN10 to PN100 as well as Class150 to Class600. The hubbed slip-on flange is suitable for medium-temperature and medium-pressure working conditions, but is not suitable for pipelines with extremely high temperature and high pressure or severe alternating loads. It achieves a good balance between installation convenience and structural strength, and is a commonly used flange type in industrial piping projects. We provide stock in multiple specifications and materials, and support non-standard customization. Welcome to contact us for detailed parameters and quotations.
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Welding Neck Flange WN
Welding neck flange (WN), commonly known as a high-neck flange, is integrally forged and formed, with a long tapered transition neck, and is connected to the pipeline by full-penetration butt welding through the neck bevel, which is different from the fillet weld connection of a slip-on flange. The tapered neck structure can smoothly distribute pipeline stress, has strong resistance to fatigue, bending moments, and alternating temperature changes, and the weld can undergo RT and UT nondestructive testing, with controllable welding quality, making it the preferred flange for high-temperature and high-pressure, flammable and explosive, and toxic medium working conditions. The products implement HG/T20592 (European standard PN system), HG/T20615 (American standard Class system), GB/T9115, ASME B16.5, and ASME B16.47 standards, and the sealing surfaces cover RF, MFM, TG, RTJ, and other forms, among which RTJ is specially used for ultra-high-pressure working conditions. The materials cover carbon steel, alloy steel, stainless steel, and duplex steel, with pressure ratings from PN10 to PN420/Class150 to 2500, and are widely used in pressure piping systems in petroleum, chemical, power, coal chemical, metallurgy, and other industries. We provide full-process customization services, and welcome detailed parameters to obtain accurate quotations.
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Socket Weld Flange SW
The socket weld flange (SW) is a forged small-diameter high-pressure flange. The pipe is inserted into the socket of the flange and then fillet welded on the outside to secure it, and sealing is achieved by bolts and gaskets. The mainstream applicable diameters are DN15-DN80 (NPS 1/2″-3″), and it complies with standards such as ASME B16.5, GB/T9119, and HG/T20592. Compared with threaded flanges, it eliminates the risk of thread leakage; compared with butt weld flanges, it requires no beveling and allows faster installation. The product is widely used in high-pressure small pipelines in chemical, oil and gas, power plant, water treatment, and other industries, and is suitable for high-temperature, high-pressure, and vibrating working conditions. Guojie provides materials such as carbon steel and stainless steel, supports non-standard customization, and welcomes you to provide dimensions and pressure ratings so that we can assist with selection.
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Threaded Flange TH
TH threaded flange, also known as screwed flange, is a forged non-welded flange that relies on the internal tapered pipe thread of the flange and the external threaded steel pipe being screwed together for assembly, and then cooperates with bolts and gaskets to achieve sealed pipeline connection. Mainstream execution standards include ASME B16.5, GB/T9116, HG/T20592, HG/T20615, common diameters are DN15-DN100 (NPS 1/2″-4″), mostly used for small and medium diameter pipelines. Its greatest advantage is that it does not require hot work welding, making it suitable for explosion-proof, welding-prohibited, renovation and emergency repair scenarios, but limited by the threaded structure, it is not suitable for main pipelines with severe thermal cycling and strong vibration. The product is widely used in instrument air supply, gas, fire protection, and utility auxiliary pipelines, and is the preferred flange fitting for flammable and explosive environments and galvanized threaded pipelines, often supplied with NPT and BSPT tapered pipe threads. Guojie provides multiple materials, pressure ratings, and sealing face forms, supports non-standard customization, and welcomes you to contact us to confirm specific requirements.
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