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    Double Sphere Expansion Rubber Joint.jpg
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    Double Sphere Rubber Expansion Joint - China Factory Suppliers for High-Quality Flange Type Joints

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    Introducing our high-quality double sphere joint flange type products, meticulously designed to meet ANSI, DIN, and BS standards. As a leading China supplier and factory, we ensure every component is crafted for durability and performance.

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    Our main body is constructed from premium materials such as EPDM, NBR, and neoprene, providing superior reliability in various applications.

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    The inner lining features advanced Chinlon cord fabrics, enhancing strength and resistance. Our frame is made from hard steel wires, ensuring structural integrity under pressure.

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    We offer flange options in both carbon steel and stainless steel, catering to your specific requirements.

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    Additionally, our unions are crafted from malleable iron for added durability and ease of installation.

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    Available sizes range from 1/2 to 24, making it easy to find the perfect fit for your project needs.

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    Choose us as your trusted supplier and factory in China for high-performance double sphere joint flanges that deliver exceptional quality and reliability.

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      Contact us
      Product Details

      Description

      The Double Ball Rubber Expansion Joint is engineered to absorb vibrations, reduce noise, and compensate for thermal expansion in industrial piping systems and water networks. Its dual-sphere design enhances flexibility, providing superior movement absorption compared to single-ball models. This makes it ideal for applications where greater axial, lateral, and angular displacement is required.

      Made from high-quality rubber materials such as EPDM, NBR, or Neoprene, and reinforced with strong synthetic fabric, this joint is built for durability and resistance to pressure, temperature, and corrosion. It is commonly used in HVAC systems, wastewater treatment, chemical plants, and pump installations.

      The Double Ball Rubber Expansion Joint offers easy installation with flanged or threaded ends, and is compatible with a variety of pipeline materials. Its robust construction helps extend system life by reducing mechanical stress on connected components.

      ★ Leading Manufacturer: As a leading rubber joint manufacturer in China, we provide reliable expansion joint solutions designed for demanding industrial environments.
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      Standard Materials Of Main Parts
      ITEM PART NAME MATERIAL
      1 Sphere EPDM / NBR
      2 Flange CS
      Dimensions: (mm)
      SIZE Axial Displacement Lateral Displacement Pn16 Pn10
      in DN L Stretch Compression D D1 n-d1 D D1 n-d1
      2 50 165 30 50 45 165 125 4-18 165 125 4-18
      2.5 65 175 30 50 45 185 145 4-18 185 145 4-18
      3 80 175 35 50 45 200 160 8-18 200 160 8-18
      4 100 225 35 50 40 220 180 8-18 220 180 8-18
      5 125 225 35 50 40 250 120 8-18 250 210 8-18
      6 150 225 35 50 40 285 240 8-23 285 240 8-23
      8 200 325 35 50 40 340 295 12-23 340 295 8-23
      10 250 325 35 60 35 405 355 12-27 395 350 12-23
      12 300 325 35 60 35 460 410 12-27 445 400 12-23
      14 350 325 35 60 40 520 470 16-27 505 460 16-23
      16 400 325 35 50 40 580 525 16-30 565 515 16-27
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      Frequently Asked Questions (FAQ)
      Q What is a Double Ball Rubber Expansion Joint used for?
      A Double Ball Rubber Expansion Joint is used to absorb vibrations, reduce noise, and compensate for thermal expansion and movement in industrial piping systems. Its dual-sphere design allows for greater axial, lateral, and angular displacement than single-ball models, making it suitable for HVAC systems, pump installations, wastewater treatment, and chemical plants.
      Q What rubber materials are available for the Double Ball Expansion Joint?
      The joint is available in EPDM, NBR, and Neoprene rubber materials. EPDM is ideal for water and weather resistance, NBR is suited for oil and fuel applications, and Neoprene offers a balance of weather, chemical, and temperature resistance. All options are reinforced with strong synthetic fabric for added durability.
      Q What size range is available for the Double Ball Rubber Expansion Joint?
      The Double Ball Rubber Expansion Joint is available in sizes ranging from DN50 (2 inch) to DN400 (16 inch), covering a wide range of pipeline applications. Custom sizes can also be manufactured upon request to meet specific project requirements.
      Q What are the pressure ratings available?
      The Double Ball Rubber Expansion Joint is available in Pn10 and Pn16 pressure ratings. The flange dimensions, bolt hole patterns, and bolt circle diameters differ between the two standards, so customers should specify their required pressure rating when placing an order.
      Q How does a Double Ball design compare to a Single Ball Rubber Expansion Joint?
      The Double Ball design provides significantly greater flexibility and movement absorption than a single ball model. It offers higher axial compression and stretch capacity, increased lateral displacement, and better angular movement accommodation. This makes it the preferred choice for applications with higher thermal expansion, vibration, or misalignment requirements.
      Q How is the Double Ball Rubber Expansion Joint installed?
      The joint is designed for easy installation with standard flanged ends, compatible with a wide variety of pipeline materials including steel, PVC, and ductile iron. It should be installed in a neutral (relaxed) position with no pre-compression or pre-stretching. Control rods or limit rods are recommended for systems with high pressure to prevent over-extension.

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