Flanged eccentric reducer belongs to flanged type reducing pipeline pipe fittings, with integrated flanges at both ends, an internal eccentric conical flow channel, the centers of the pipe openings at both ends are not on the same centerline, and one side of the pipe wall remains straight. After installation, the bottom or top of the pipeline is flush, which can effectively avoid air pockets, accumulated liquid, and impurity sedimentation in horizontal pipelines, and reduce the risks of pump cavitation, water hammer, and idle running. The product adopts hot pressing, forging, or integral casting processes, and is connected by bolts and sealing gaskets, requiring no on-site welding, making disassembly, assembly, and maintenance convenient. We can provide materials such as carbon steel, stainless steel, alloy steel, and ductile iron, with pressure ratings covering PN6~PN100 and Class150~Class1500, and sealing surfaces optionally RF raised face, MFM male-female face, etc. It is suitable for horizontal transportation pipelines in water supply and drainage, HVAC and fire protection, chemical industry, power plant circulating water, sewage treatment, etc., and is also suitable for overseas engineering foreign trade procurement.
Overview
A flanged eccentric reducer is a reducing pipe fitting with flanges at both ends, featuring an internal eccentric conical structure, where the centers of the pipe openings at both ends are not on the same centerline, and one side of the pipe wall remains straight. It is mainly used in horizontal pipelines to solve the problem of easy gas accumulation and liquid accumulation during pipe diameter transition. Unlike concentric reducers, the eccentric structure keeps the bottom or top of the pipeline flush after installation, which can reduce gas pockets and impurity sedimentation, and lower the risks of pump cavitation, water hammer, and idle running. The product adopts hot-pressing forming, forging, or integral casting processes, with integrated flanges at both ends, connected by bolts and sealing gaskets, requiring no on-site welding, and facilitating disassembly, assembly, and maintenance. We can provide materials such as carbon steel, stainless steel, alloy steel, and ductile iron, with diameters covering DN15-DN1200, pressure ratings supporting PN6~PN100, Class150~Class1500, and sealing surfaces available in RF raised face, MFM male-female face, etc.
Key Selling Points
The eccentric structure is the core of this pipe fitting. The straight design on one side keeps the bottom or top of the pipeline flush after installation, making horizontal pipelines less prone to gas accumulation, liquid accumulation, and impurity buildup, which is especially important for pump inlet and outlet pipelines. The flanged connections at both ends eliminate on-site welding, and assembly can be done with bolts and sealing gaskets, making disassembly, assembly, and maintenance more convenient. The internal conical flow passage transitions smoothly, helping to reduce fluid turbulence and local resistance. The range of diameter and material choices is relatively wide, and conventional pressure ratings and sealing surface forms can be confirmed according to project requirements. We support customization of non-standard reduction ratios, special drop heights, unconventional diameter combinations, special materials, and surface treatments, and can also mark according to project requirements.
Applications
Flanged eccentric reducers are specifically used in horizontal pipeline reduction scenarios. In civil buildings, they are commonly used for pipe diameter transitions in horizontal building water supply and drainage pipelines, horizontal central air conditioning HVAC pipelines, and horizontal building fire protection main pipelines. In municipal engineering, they are used for reduction connections in urban water supply, heating, and rainwater and sewage horizontal pipe networks. In the industrial and power sectors, they are used in chemical process horizontal pipelines, power plant circulating water horizontal pipe networks, sewage treatment horizontal pipelines, as well as pump inlet and outlet and horizontal main pipe branch connection positions. They are also suitable for pipe fitting wholesale and cross-border foreign trade procurement, and can adapt to standard or non-standard requirements of overseas engineering projects. Vertical risers usually use concentric reducers, and the two working conditions are not recommended to be mixed.
Specifications
Diameters cover DN15-DN1200, and materials include carbon steel, stainless steel, alloy steel, ductile iron, etc. Please contact us to confirm specific grades. Pressure ratings support PN6~PN100, Class150~Class1500, and sealing surfaces are available in RF raised face, MFM male-female face, etc. Please contact us to confirm other sealing surface forms. Manufacturing standards can be implemented according to national standards, American standards, and chemical industry standards. Please contact us to confirm specific standard numbers. Conventional in-stock mainstream specifications support a minimum order of 1 piece, and non-standard customization is confirmed according to project requirements. For packaging, small diameters use bubble wrap plus hard cardboard boxes, medium diameters are reinforced with stretch film, and large diameters use solid wood pallets plus steel strapping. Export fumigated wooden pallets and customized shipping marks are supported.
Purchasing & Delivery
We adopt a flexible minimum order mechanism. Conventional in-stock mainstream specifications support a minimum order of 1 piece, suitable for sample submission for inspection, sporadic maintenance, small-order replenishment, and engineering centralized procurement. The warehouse regularly stocks conventional pressures of PN10, PN16, and PN25, and commonly used eccentric reducer specifications in carbon steel and 304 stainless steel. Orders are shipped within 24 hours after confirmation. Please contact us to confirm the delivery time for non-standard customized orders. Packaging provides graded protection according to diameter, with key protection for the flange sealing surfaces at both ends and the eccentric irregular structure. The outer packaging is marked with specifications, reduction dimensions, material, pressure, standard, and batch information, facilitating warehouse verification and engineering acceptance. Transportation methods such as less-than-truckload, full truckload, sea freight, and air freight are supported.
Service & Support
We provide full-process support for flanged eccentric reducers before sales, during sales, and after sales. Before sales, we can assist with selection for horizontal pipeline reduction working conditions, eccentric reduction adaptation verification, hydraulic parameter verification, drawing adaptation, and budget quotations. During sales, we synchronize production, quality inspection, and shipping progress. After sales, we provide installation guidance and technical answers for pipe network operation and maintenance. For large pipe network projects, we can provide remote technical disclosure and full-process technical follow-up. Products undergo quality inspection before leaving the factory, and genuine products enjoy a 12-month official warranty. During the warranty period, quality problems such as cracking, leakage, deformation, sealing failure, and wall thickness defects caused by non-human reasons are supported with free replacement, free reissue, and bearing of round-trip logistics costs. Unused standard products with intact packaging support seven-day no-reason return and exchange. After-sales issues are responded to within 2 hours, solutions are issued on the same day, and free technical consultation is provided for life.
FAQ
How to distinguish between the use of eccentric reducers and concentric reducers?
For horizontal pipelines and pump inlet and outlet, it is recommended to use eccentric reducers. One side being flush can exhaust gas and drain liquid, reducing gas pockets, liquid accumulation, and pump cavitation failures. Vertical risers usually use concentric reducers to ensure coaxial stress uniformity and neat installation of the pipeline. The two working conditions are not recommended to be mixed, as misuse can easily cause pipe network failures.
Do flanged eccentric reducers need on-site welding?
No. Both ends of the product are integrated with flanges and connected by bolts and sealing gaskets, so no on-site welding is required, making disassembly and maintenance relatively convenient, and there is no risk of weld seam leakage.
What materials and pressure ratings can you provide?
Materials include carbon steel, stainless steel, alloy steel, ductile iron, etc. Please contact us to confirm the specific grades. Pressure ratings support PN6~PN100, Class150~Class1500, and sealing surfaces can be selected from RF raised face, MFM male-female face, etc.
Can non-standard sizes or special materials be customized?
Yes. We support customization requirements such as non-standard reducing ratios, special drop, unconventional diameter combinations, special materials, surface treatment, and LOGO marking. Please provide the specific size, material, pressure rating, and quantity, and we will assist in confirming the configuration and providing a quotation.
What are the delivery time and minimum order quantity for regular specifications?
Regular in-stock mainstream specifications support a minimum order of 1 piece. For PN10, PN16, PN25 regular pressures and common eccentric reducer specifications in carbon steel and 304 stainless steel, shipment is made within 24 hours after order confirmation. For the delivery time of non-standard customized orders, please contact us to confirm.
