The core purpose of the flange concentric reducer is vertical pipeline system diameter transition, smooth diameter reduction, flow velocity regulation, and pressure equalization. It is a standard reducer fitting dedicated to risers, mainly
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Flanged concentric reducers are also commonly called flanged concentric reducers, and belong to integrally flanged reducing pipe fittings. The centers of both ends are on the same central axis, and the shape is a symmetrical cone. Both ends have their own flange plates, and pipeline connection is completed by bolts together with sealing gaskets, without the need for on-site hot work welding, making disassembly, assembly, and maintenance convenient. They are mainly used on vertical risers to connect two sections of pipeline with different nominal diameters, allowing the fluid to transition smoothly at the reducing point, adjusting the medium flow rate, reducing local pressure drop, and solving the problem of mismatched diameters of pipelines, valves, and equipment on risers. The interior is a smooth conical flow channel, the medium flows smoothly, turbulence is low, and pipe wall erosion loss is low. The products implement standards such as GB/T17185, GB/T12459, HG/T21635, ASME B16.5, etc., with nominal diameters DN15 to DN1200, and support arbitrary diameter reducing combinations at both ends. Pressure ratings cover national standards PN6, PN10, PN16, PN25, PN40, PN64, PN100, and American standards Class150 to Class1500. Materials can be selected from 20# carbon steel, Q235B, Q345B, 304/304L/316/316L stainless steel, 16Mn alloy steel, ductile iron, and can also be customized according to project 2
| Product Name | Concentric Flange Reducer |
| Product Category | Reducer |
| Customization | The factory has full-dimensional one-stop customization capability for flanged concentric reducers, and can undertake customization needs for various non-standard sizes, special working conditions, special processes, and special parameters. Supports customization of arbitrary non-standard reducer reducing ratios, can produce concentric reducing pipe fittings with special drop and unconventional diameter combinations, suitable for various special vertical riser designs. Pressure ratings can be customized from PN6 to PN100 national standard, Class150 to Class1500 American standard ultra-high pressure specifications, suitable for medium-high pressure and ultra-high pressure severe riser working conditions. Materials can be customized with high-end materials such as 2205 duplex steel, Monel alloy, Hastelloy alloy, special wear-resistant alloy steel, etc., suitable for vertical pipelines with high temperature, strong corrosion, and impurity media. Flange sealing surfaces can be customized as RF, MFM, TG, RJ |
| MOQ | Flanged concentric reducers adopt a flexible and lenient minimum order mechanism, with no high threshold restrictions, fully accommodating various procurement volumes such as sample submission for inspection, sporadic maintenance, small-order replenishment, project centralized procurement, and foreign trade export. Regular in-stock mainstream specifications support ordering from 1 piece, including PN16 and PN25 regular pressure ratings, and common concentric reducing models in carbon steel and 304 stainless steel, which can fully meet on-site riser emergency repairs |
| Lead Time | Flanged concentric reducers establish a three-tier stable delivery system of in-stock, regular orders, and non-standard customization, precisely matching the construction schedules of various riser projects and foreign trade shipping schedules. The warehouse routinely stocks popular standard in-stock items, PN10, PN16, PN25 regular pressure ratings, and common concentric reducer specifications in carbon steel and 304 stainless steel. After order confirmation, ultra-fast shipment within 24 hours, meeting on-site riser |
| Packaging | Flanged concentric reducers adopt graded industrial refined protective packaging, focusing on protecting the precision flange sealing surfaces at both ends, eliminating transportation bumps, scratches, rust, and deformation issues. All products undergo internal and external cleaning treatment before leaving the factory. Carbon steel pipe fittings are sprayed with high-quality anti-rust oil for rust protection, and stainless steel pipe fittings undergo anti-oxidation isolation treatment to avoid dissimilar metal contamination and surface oxidation. All flange sealing surfaces are uniformly affixed with thickened wear-resistant protective rubber pads, strictly preventing sealing surface damage caused by transportation friction and impact, ensuring on-site installation sealing precision. DN15-DN100 small-diameter products are individually wrapped in bubble film and packed in hardened cardboard boxes; DN125-DN400 medium-diameter products are multi-layer stretch film wrapped and reinforced as a whole to prevent shaking; DN450 and above large-diameter heavy-duty products adopt solid |
| Reference Price | Inquiry |
| Nominal Size | DN15～DN1200, supporting arbitrary diameter reducing combinations at both ends |
The flange concentric reducer is a reducing pipe fitting with flanges at both ends and centers on the same axis, with a symmetrical conical shape. It is mainly used on vertical risers to connect two sections of pipe with different nominal diameters, achieving smooth fluid reduction, adjusting medium flow velocity, reducing local pressure drop, and solving the problem of mismatched diameters of pipes, valves, and equipment on risers. The product has an integrated flange structure at both ends, relying on bolts and sealing gaskets to complete pipeline connection, without the need for on-site hot work welding, and is easy to disassemble and maintain. The internal smooth conical flow channel allows smooth medium flow, low turbulence, and low pipe wall erosion loss. We provide common specifications from DN15 to DN1200, support arbitrary diameter reduction combinations at both ends, and can confirm configurations according to project requirements.
The flange concentric reducer has engineering advantages such as being dedicated to risers, coaxial symmetry, smooth flow channel, weld-free quick installation, and stable force bearing. The coaxial centered symmetrical structure makes riser installation highly vertical, evenly stressed, and free of eccentric load, making it less prone to deformation and loosening during long-term operation, and suitable for high-altitude vertical pipelines. The conical integrated flow channel provides smooth transition, low medium transportation resistance, low pressure drop, weak turbulence, and light pipe wall erosion. The integrated flanges at both ends are connected by bolts and gaskets, requiring no hot work welding on site, reducing construction safety risks and facilitating later disassembly and maintenance. Diameter, pressure, material, flange type, and sealing face can be combined and confirmed according to project requirements.
The flange concentric reducer is specifically used for vertical riser reduction scenarios, covering civil buildings, municipal engineering, industrial production, power and heating, and environmental protection and chemical industries in various riser systems. Civil scenarios include building water supply and drainage vertical riser reduction, central air conditioning HVAC vertical pipeline diameter transition, building fire protection main riser reduction, and machine room equipment vertical interface matching. Municipal scenarios are used for urban water supply risers, heating vertical pipe networks, and rainwater and sewage vertical pipeline reduction connections. Industrial scenarios are used for chemical process vertical pipelines, power plant circulating water risers, sewage treatment vertical pipe networks, and oil and gas engineering vertical pipelines. For horizontal pipelines, it is recommended to prioritize eccentric reducers to avoid gas pockets, liquid accumulation, and water hammer problems.
Nominal diameter DN15 to DN1200, supporting arbitrary diameter reduction combinations at both ends. Pressure ratings cover national standards PN6, PN10, PN16, PN25, PN40, PN64, PN100, and American standards Class150 to Class1500. Materials can be selected from 20# carbon steel, Q235B, Q345B, 304/304L/316/316L stainless steel, 16Mn alloy steel, ductile iron, and special corrosion-resistant alloys such as 2205 duplex steel, Hastelloy, and Monel alloy can also be customized according to project requirements. Flange types are divided into plate flat welding, neck flat welding, and neck butt welding; sealing faces support RF raised face, MFM male and female face, TG tongue and groove face, and RJ ring joint face. Forming processes include hot pressing, forging, and integral casting. Products comply with standards such as GB/T17185, GB/T12459, HG/T21635, ASME B16.5. Please contact us to confirm specific specification configurations.
The flange concentric reducer adopts a flexible minimum order mechanism. Mainstream conventional in-stock specifications support ordering from 1 piece, including PN16 and PN25 conventional pressures, and commonly used concentric reducer models in carbon steel and 304 stainless steel, which can meet procurement volumes such as sample submission for inspection, sporadic maintenance, small order replenishment, engineering centralized procurement, and foreign trade export. The warehouse keeps common standard stock, and shipments are made within 24 hours after order confirmation. Please contact us to confirm the specific delivery time. Packaging adopts graded industrial protection: DN15-DN100 small-diameter products are individually wrapped in bubble film and packed in hard cartons; DN125-DN400 medium-diameter products are reinforced overall with multi-layer winding film; DN450 and above large-diameter heavy-duty products are fixed on solid wood pallets, locked with steel straps, and fully wrapped with waterproof film. The outer packaging is marked with specifications, reduction dimensions, material, pressure, standard, and batch information, and supports foreign trade fumigated wooden pallets, waterproof packaging, and customized shipping marks.
We provide full-process after-sales service for flange concentric reducers. All products undergo 100% strict quality inspection before leaving the factory, and genuine products uniformly enjoy a 12-month official warranty service. During the warranty period, quality problems such as cracking, leakage, deformation, sealing failure, and wall thickness defects caused by non-human impact or illegal use under overpressure are supported with free replacement, free reshipment, and bearing of round-trip logistics costs. Before sale, we provide free services including riser reduction working condition selection, reduction ratio matching, hydraulic parameter verification, drawing adaptation, and budget quotation; during sale, we synchronize the whole process of production, quality inspection, and shipment in real time; after sale, we provide professional riser installation guidance, vertical pipe network operation and maintenance optimization, and technical answers for troubleshooting. For large riser projects, we can provide remote technical disclosure and full-process technical follow-up. We support seven-day no-reason return and exchange for unused standard products in good packaging. After-sales response is extremely fast, connecting to problems within 2 hours and issuing solutions on the same day, and providing free technical consultation for life.
Concentric reducers are only suitable for vertical risers, with axisymmetric centerlines, uniform force distribution, and no liquid or gas accumulation, making them specialized reducing pipe fittings for vertical water supply and drainage, fire protection, HVAC, and process piping. For horizontal piping, eccentric reducers should be preferred, which can avoid gas pockets, liquid accumulation, and water hammer problems.
Both ends of the product come with integrated flanges, and connection is completed through bolts paired with sealing gaskets, without the need for on-site hot work welding. Disassembly, assembly, and maintenance are convenient, reducing welding operations and leakage risks in riser construction.
Nominal diameter DN15 to DN1200, supporting arbitrary diameter reduction combinations at both ends. Pressure ratings cover national standards PN6, PN10, PN16, PN25, PN40, PN64, PN100, and American standards Class150 to Class1500. Please contact us to confirm specific configurations.
Mainstream specifications in regular stock support a minimum order of 1 piece, including PN16 and PN25 regular pressures, and commonly used concentric reducer models in carbon steel and 304 stainless steel. The warehouse keeps standard stock of popular items, shipping within 24 hours after order confirmation. For non-standard custom delivery times, please contact us to confirm.
All products undergo 100% strict quality inspection before leaving the factory, and genuine products uniformly enjoy a 12-month official warranty service. During the warranty period, for quality issues such as cracking, leakage, deformation, seal failure, wall thickness defects, etc. caused by non-human impact or illegal use due to overpressure, free replacement, free reshipment, and bearing of round-trip logistics costs are supported. After-sales responds to issues within 2 hours, issues a solution plan on the same day, and provides free technical consultation for life.
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