DN150*DN200 Floating Flanged Reducing Rubber Expansion Joint
DN150*DN200
The DN150 x DN200 Floating Flanged Reducing Rubber Expansion Joint is a high-performance, spherical, reducing connector engineered to provide flexible transitions between piping systems of different nominal diameters. This component is a precision-molded, reducing fitting that combines the vibration-absorbing and noise-reducing properties of a rubber expansion joint with the functionality of a concentric reducer. Its primary purpose is to connect a DN200 pipeline to a smaller DN150 pipe, pump, or valve, while simultaneously compensating for thermal expansion, mechanical vibration, and pipeline misalignment. By integrating the reducer and expansion joint into a single unit, this product simplifies the piping layout, reduces the overall system weight, and minimizes the number of potential leak paths.
Delivery
FOB
minimum order
1 piece
Supply Ability
100piece / Month
Country of Origin
China
Stock Time
30Day
Quantity:
US $100.00 - US $10000.00 / piece
**Design and Construction**
The construction of this expansion joint is robust, featuring a single, flexible rubber sphere or bellow that incorporates a seamless reducing taper. The unit consists of several critical layers and materials engineered for maximum durability and performance. The inner tube is manufactured from high-grade synthetic rubber, such as EPDM (Ethylene Propylene Diene Monomer), NBR (Nitrile Butadiene Rubber), or Neoprene, selected for its excellent resistance to the specific media being transported, whether it be water, seawater, oil, chemicals, or hot water. This inner tube is reinforced with multiple plies of high-tensile nylon cord fabric, which is embedded within the rubber to provide exceptional pressure resistance, dimensional stability, and structural integrity under both pressure and vacuum conditions. An outer cover of weather and ozone-resistant rubber encapsulates the reinforcement, providing protection against external environmental factors. The assembly is completed by the floating flanges at both the large (DN200) and small (DN150) ends, which are typically made from carbon steel and can be hot-dip galvanized or supplied in stainless steel for enhanced corrosion resistance.
**Floating Flange Connection**
The defining feature of this product is its use of floating flanges, also known as Vanstone-type or rotating flanges, on both the large and small diameter ends. Unlike fixed flanges, the floating flange is designed to rotate freely and independently of the rubber body. This rotating capability provides a significant advantage during installation, as it eliminates the need for precise, time-consuming bolt hole alignment. When connecting the joint to existing companion flanges on pipes or equipment, the installer can simply rotate the floating flange to match the bolt holes, simplifying the connection process, drastically reducing labor time, and ensuring a perfect fit even if the bolt holes are not perfectly aligned. This design feature also helps to accommodate angular and lateral movements more effectively, as the flange does not impose torsional stress on the rubber body. The flanges are manufactured to comply with standard drilling patterns, such as PN10/16, ANSI 150LB, JIS 10K, or other international flange standards, ensuring compatibility with a wide range of existing piping systems.
**Functional Benefits and Movement Capability**
This expansion joint is engineered to absorb movement in multiple planes. Its flexible rubber sphere allows for significant axial compression and extension, which compensates for thermal expansion and contraction of the pipeline. It also accommodates lateral offset, correcting for minor misalignments between the connected pipes, and angular deflection, which absorbs directional changes and reduces stress at connection points. A key functional benefit is its exceptional ability to dampen vibration and reduce noise transmission. The natural damping properties of the rubber effectively isolate and dissipate the energy generated by pumps, chillers, and compressors, thereby protecting sensitive equipment and extending the lifespan of the piping system. This makes the DN150 x DN200 reducer joint an ideal component for pump connectors, HVAC systems, water treatment facilities, and industrial processing plants where vibration control and a smooth flow transition are critical.
**Material Selection and Application Versatility**
The product's performance and service life are highly dependent on the selected elastomer, which can be tailored to the specific application. The most common material, EPDM, offers excellent resistance to hot water, steam, weather, ozone, and mild chemicals, making it suitable for HVAC systems and water treatment applications. For applications involving oils, petroleum products, or hydrocarbon-based fluids, a nitrile rubber (NBR) construction is recommended. For extreme chemical resistance, particularly with acids and alkalis, a fluorocarbon rubber (FKM) lining may be specified. The internal reinforcement provided by the nylon cord allows the joint to withstand high operating pressures, while the floating flanges, combined with optional control rod assemblies, can be used to manage pressure thrust forces and limit the joint's movement to protect the pipeline.
**Conclusion**
The DN150 x DN200 Floating Flanged Reducing Rubber Expansion Joint is a versatile, high-efficiency pipeline component that effectively combines the functions of a flexible connector, vibration isolator, and concentric reducer. Its innovative floating flange design ensures easy and quick installation, while the robust rubber and reinforced construction provides long-term reliability in demanding applications. By absorbing vibration, reducing noise, and compensating for pipeline movement, this product significantly enhances the overall performance and longevity of the piping system, making it an indispensable solution for engineers and maintenance professionals alike.
The construction of this expansion joint is robust, featuring a single, flexible rubber sphere or bellow that incorporates a seamless reducing taper. The unit consists of several critical layers and materials engineered for maximum durability and performance. The inner tube is manufactured from high-grade synthetic rubber, such as EPDM (Ethylene Propylene Diene Monomer), NBR (Nitrile Butadiene Rubber), or Neoprene, selected for its excellent resistance to the specific media being transported, whether it be water, seawater, oil, chemicals, or hot water. This inner tube is reinforced with multiple plies of high-tensile nylon cord fabric, which is embedded within the rubber to provide exceptional pressure resistance, dimensional stability, and structural integrity under both pressure and vacuum conditions. An outer cover of weather and ozone-resistant rubber encapsulates the reinforcement, providing protection against external environmental factors. The assembly is completed by the floating flanges at both the large (DN200) and small (DN150) ends, which are typically made from carbon steel and can be hot-dip galvanized or supplied in stainless steel for enhanced corrosion resistance.
**Floating Flange Connection**
The defining feature of this product is its use of floating flanges, also known as Vanstone-type or rotating flanges, on both the large and small diameter ends. Unlike fixed flanges, the floating flange is designed to rotate freely and independently of the rubber body. This rotating capability provides a significant advantage during installation, as it eliminates the need for precise, time-consuming bolt hole alignment. When connecting the joint to existing companion flanges on pipes or equipment, the installer can simply rotate the floating flange to match the bolt holes, simplifying the connection process, drastically reducing labor time, and ensuring a perfect fit even if the bolt holes are not perfectly aligned. This design feature also helps to accommodate angular and lateral movements more effectively, as the flange does not impose torsional stress on the rubber body. The flanges are manufactured to comply with standard drilling patterns, such as PN10/16, ANSI 150LB, JIS 10K, or other international flange standards, ensuring compatibility with a wide range of existing piping systems.
**Functional Benefits and Movement Capability**
This expansion joint is engineered to absorb movement in multiple planes. Its flexible rubber sphere allows for significant axial compression and extension, which compensates for thermal expansion and contraction of the pipeline. It also accommodates lateral offset, correcting for minor misalignments between the connected pipes, and angular deflection, which absorbs directional changes and reduces stress at connection points. A key functional benefit is its exceptional ability to dampen vibration and reduce noise transmission. The natural damping properties of the rubber effectively isolate and dissipate the energy generated by pumps, chillers, and compressors, thereby protecting sensitive equipment and extending the lifespan of the piping system. This makes the DN150 x DN200 reducer joint an ideal component for pump connectors, HVAC systems, water treatment facilities, and industrial processing plants where vibration control and a smooth flow transition are critical.
**Material Selection and Application Versatility**
The product's performance and service life are highly dependent on the selected elastomer, which can be tailored to the specific application. The most common material, EPDM, offers excellent resistance to hot water, steam, weather, ozone, and mild chemicals, making it suitable for HVAC systems and water treatment applications. For applications involving oils, petroleum products, or hydrocarbon-based fluids, a nitrile rubber (NBR) construction is recommended. For extreme chemical resistance, particularly with acids and alkalis, a fluorocarbon rubber (FKM) lining may be specified. The internal reinforcement provided by the nylon cord allows the joint to withstand high operating pressures, while the floating flanges, combined with optional control rod assemblies, can be used to manage pressure thrust forces and limit the joint's movement to protect the pipeline.
**Conclusion**
The DN150 x DN200 Floating Flanged Reducing Rubber Expansion Joint is a versatile, high-efficiency pipeline component that effectively combines the functions of a flexible connector, vibration isolator, and concentric reducer. Its innovative floating flange design ensures easy and quick installation, while the robust rubber and reinforced construction provides long-term reliability in demanding applications. By absorbing vibration, reducing noise, and compensating for pipeline movement, this product significantly enhances the overall performance and longevity of the piping system, making it an indispensable solution for engineers and maintenance professionals alike.
