Reducing four-way fitting
异径四通
Tees & Crosses / Tees & Crosses
Reducing four-way fitting
异径四通
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Product Overview
A reducing tee is a four-way fitting with a larger diameter on the main branch and a smaller diameter on the branch, used to connect pipes of different diameters while enabling multidirectional flow diversion or convergence.
It enables seamless diameter transitions in complex piping networks without interrupting the main pipeline, making it a core component for building flexible, scalable industrial piping systems.
It is widely used in oil and gas, chemical, power generation, and water supply projects, and can operate stably and reliably under a wide range of pressure and temperature conditions.
Key Specifications and Parameters
| Parameter | Details |
| Product Type | Reducing four-way fitting (reducing tee) |
| Technology | Seamless / Welded |
| Size range | Seamless specifications: DN15–DN1200 Welding specifications: DN200–DN2000 |
| Wall thickness | SCH10, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH120, SCH160, XS, XXS, with a maximum wall thickness of up to 150 mm. |
| Material | Carbon steel: A234-WPB, A420-WPL3/WPL6 Alloy steels: WP5, WP9, WP11, WP22 Stainless steel: WP304/304L, WP316/316L, S31803, 2205 (Note: “403-WP304/L” is a typographical error; this grade does not exist in the standard.) Other materials: API 5L pipeline steel grades and sulfur‑resistant materials compliant with NACE MR-0175. |
| Standard | ASME B16.9, GB/T 12459, DIN 2615, GOST 17375, JIS B2311 |
| Coating Options | Anti-corrosion paint, 3LPE three-layer polyethylene anti-corrosion coating, hot-dip galvanizing, electroplating, etc. |
Production Process and Quality Control
Our factory manufactures reducing tees using advanced processes such as hot‑press forming and seamless integral molding, ensuring uniform wall thickness and high structural strength at all connection points.
All products undergo rigorous quality inspections:
Chemical Composition Analysis and Mechanical Property Testing
Microstructural examination and verification of heat treatment processes
Nondestructive Testing (NDT): Ultrasonic Testing, Penetrant Testing, Magnetic Particle Testing, Radiographic Testing
Hydraulic pressure test and shot blasting treatment
Customized testing solutions can be tailored to meet specific customer requirements.
Application areas
Reducing tees are widely used in various industries that require multi‑directional flow diversion and convergence at different diameters:
Water Treatment and Wastewater Disposal System
Power Station and Power Engineering Projects
Chemical plants, refineries
Shipbuilding and Ocean Engineering
Nuclear power supporting facilities
Natural gas and oil transmission pipeline network
Customized Services
We offer a full suite of customized services to meet the unique requirements of various projects, with customization scope including:
Customization supervisor, branch pipe diameter, wall thickness, and pressure rating
Special materials tailored for corrosive and high-temperature service conditions
Customized Anti-Corrosion Coatings and Surface Treatment Processes
Non-standard dimensions and special structural styles
Product Summary
Reducing tees are essential fittings for constructing highly adaptable pipeline systems with multiple flow directions. Our products are manufactured from premium-grade raw materials, featuring exceptional machining accuracy and fully compliant with international standards, ensuring reliable performance even under demanding industrial conditions.
We offer a comprehensive range of product specifications and support customizations, providing tailored solutions for projects of all types.
Specifications
| Parameter | Details |
| Product Type | Reducing four-way fitting (reducing tee) |
| Technology | Seamless / Welded |
| Size range | Seamless specifications: DN15–DN1200 Welding specifications: DN200–DN2000 |
| Wall thickness | SCH10, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH120, SCH160, XS, XXS, with a maximum wall thickness of up to 150 mm. |
| Material | Carbon steel: A234-WPB, A420-WPL3/WPL6 Alloy steels: WP5, WP9, WP11, WP22 Stainless steel: WP304/304L, WP316/316L, S31803, 2205 (Note: “403-WP304/L” is a typographical error; this grade does not exist in the standard.) Other materials: API 5L pipeline steel grades and sulfur‑resistant materials compliant with NACE MR-0175. |
| Standard | ASME B16.9, GB/T 12459, DIN 2615, GOST 17375, JIS B2311 |
| Coating Options | Anti-corrosion paint, 3LPE three-layer polyethylene anti-corrosion coating, hot-dip galvanizing, electroplating, etc. |