Hangzhou Bright Rubber Plastic Product Co., Ltd. is one of the leading manufacturers and suppliers of double sphere flexible rubber joint forged flange flexible joint in China. If you're going to buy double sphere flexible rubber joint forged flange flexible joint made in China, welcome to get more information from our factory. We also accept customized orders.
Product Description
Product Description
Technical information of galvanized flange rubber joint
| NO. | Name | Material |
| 1 | Outer/Inner rubber | NR,NBR,EPDM |
| 2 | Rubber sphere body | Nylon Cord Fabric |
| 3 | Reinforcing ring | Steel wire |
| 4 | Flange |
Q235 /ss304/ss321 etc. |
| Type | 1 | 2 | 3 | |
| Working pressure(kg f/cm2) | 1.0(10) | 1.6(16) | 2.5(25) | |
| Explosion pressure(kg f/cm2) | 3.0(30) | 4.8(48) | 5.5(55) | |
| VacuumKPa(mmHg) | 53.3(400) | 86.7(650) | 100(750) | |
| Applicable Temperature | -15~80,(-30~150 underspecial conditions) | |||
| Applicable Media | water,sea water,hot water,oil,acid,alkali, and so on | |||
Size range from DN25-3000 are all available, special size and length can be customized
| Nominal diamrter |
Length (mm) |
Axial displacement | Horizontal movement(mm) | Deflection angle(a1+a2) | Special length(mm) | ||
| mm | inch | Compression(mm) | Extension(mm) | ||||
| 32 | 1-1/4 | 95 | 9 | 6 | 9 | 15 | 130/150/200 |
| 40 | 1-1/2 | 95 | 10 | 6 | 9 | 15 | 130/150/200 |
| 50 | 2 | 105 | 10 | 7 | 10 | 15 | 130/150/200 |
| 65 | 2-1/2 | 115 | 13 | 7 | 11 | 15 | 130/150/200 |
| 80 | 3 | 135 | 15 | 8 | 12 | 15 | 130/150/200 |
| 100 | 4 | 150 | 19 | 10 | 13 | 15 | 130/200 |
| 125 | 5 | 165 | 19 | 12 | 13 | 15 | 130/150/200 |
| 150 | 6 | 180 | 20 | 12 | 14 | 15 | 130/150/200 |
| 200 | 8 | 210 | 25 | 16 | 22 | 15 | 130/150/200 |
| 250 | 10 | 230 | 25 | 16 | 22 | 15 | 130/150/200 |
| 300 | 12 | 245 | 25 | 16 | 22 | 15 | 130/150/200 |
| 350 | 14 | 255 | 25 | 16 | 22 | 15 | 130/150/200 |
| 400 | 16 | 255 | 25 | 16 | 22 | 15 | 130/150/200 |
| 450 | 18 | 255 | 25 | 16 | 22 | 15 | 130/150/200 |
| 500 | 20 | 255 | 25 | 16 | 22 | 15 | 200 |
The primary function of this joint is to act as a flexible connector between rigid pipes, pumps, and heavy machinery. It is widely utilized in industrial infrastructure, including water treatment facilities, HVAC systems, chemical processing plants, and power generation stations. By absorbing movements caused by thermal expansion, contraction, or ground settlement, the joint protects the connected piping network from structural fatigue and potential failure.
Structural Design and Material Composition
The core of the joint consists of a hollow, tubular rubber body reinforced with internal layers. The rubber arches are typically manufactured from synthetic elastomers such as EPDM (Ethylene Propylene Diene Monomer), NBR (Nitrile Butadiene Rubber), or Natural Rubber, selected based on the specific fluid medium and operating temperature. The inner layer of the rubber body is designed to be smooth, minimizing flow resistance and preventing the accumulation of sediment or scale.
To withstand internal system pressure, the rubber body is reinforced with multiple layers of high-strength nylon cord fabric. This reinforcement layer is vulcanized directly into the rubber, providing the necessary tensile strength to contain pressure while allowing the joint to flex. In high-pressure applications, a steel wire ring is often embedded within the structure to serve as a pressure-boosting ring, further enhancing the joint's load-bearing capacity.
The joint terminates in forged steel flanges, which are permanently bonded to the rubber body. The use of forged flanges, typically made from materials like Q235 carbon steel or stainless steel (304/316), provides superior mechanical strength and structural integrity compared to cast alternatives. These flanges are drilled according to standard specifications (such as GB, ANSI, or JIS) to ensure compatibility with standard mating pipe flanges.
Performance Characteristics: Displacement and Vibration Isolation
The defining feature of the double sphere design is its enhanced ability to accommodate multi-directional displacement. The presence of two rubber arches significantly increases the joint's total length compared to a single sphere unit of the same diameter. This added length allows for greater axial compression, axial extension, and lateral (transverse) deflection.
Axial and Lateral Movement: The joint can absorb the elongation or shortening of pipes due to temperature changes. It also compensates for minor misalignments during installation, allowing for lateral shifts without imposing stress on the pipe walls.
Angular Deflection: The flexible rubber body permits a degree of angular rotation, accommodating situations where the connecting pipe flanges are not perfectly parallel.
Vibration and Noise Dampening: The elastic nature of the rubber effectively isolates vibrations generated by pumps, compressors, and turbines. This prevents the transmission of mechanical vibration and structure-borne noise through the piping system, contributing to a quieter operating environment and reducing wear on connected equipment.
Installation and Operational Considerations
Proper installation is critical to the performance and longevity of the double sphere flexible joint. During installation, the bolts connecting the forged flanges should be tightened symmetrically and gradually in a diagonal sequence. This ensures even pressure distribution across the gasket surface and prevents local leakage or distortion of the rubber body.
Because the double sphere joint is longer and more flexible than standard connectors, it is susceptible to instability under high pressure if not properly supported. For vertical installations or applications involving significant pressure, it is standard practice to install tie rods or limit devices across the flanges. These limit rods prevent the joint from over-extending or separating (pulling apart) beyond its designed displacement limits during pressure surges or water hammer events.
Other related products
The joint should not be used to correct severe misalignment beyond its specified tolerance. Furthermore, it must be protected from external damage, such as welding sparks, sharp tools, or prolonged exposure to direct sunlight and ozone, unless the outer rubber cover is specifically compounded for UV and weather resistance.
The Double Sphere Flexible Rubber Joint with Forged Flange serves as a robust solution for managing movement and vibration in complex piping networks. By combining the superior strength of forged flanges with the high elasticity of a dual-arch reinforced rubber body, it offers extended displacement capabilities and reliable sealing performance. Its design addresses the engineering requirements for thermal compensation, misalignment correction, and noise reduction in demanding industrial fluid handling systems.
FAQ
Q: Are you manufacturer or trading company?
A: We are manufacturer, engineer had rich experience over 20 years.
Q: How to get the quickest quotation?
A: Sending drawing, material, quantity and other rrequirements by email.
Q: How to get quotation without drawing?
A: Possible send sample, pictures or detail descriptions of products to us, we will return you drawing for confirm.
Q: I have an idea for a new product, but not sure if it can be manufactured. Can you help?A. Yes! We are always happy to work with potential customers to evaluate the technical feasibility of your idea or design and we can advise on materials, tooling and likely set-up costs.
Q: My custom products have already been developed on CAD. Can you use the drawings?
A. Yes! DWG, DXF, IGES, Solidworks and Rhino files can all be used to generate quotes, models and mould tools - this can save time and money in producing your parts.
Q: Can I test my idea/product before committing to mould tool manufacture?
A. Yes, we can use CAD drawings to make models for design and functional evaluations.
Q: What type of plastic/rubber material is best for my design/product?
A. Materials selection depends on the application of your design and the environment in which it will function. We will be happy to discuss the alternatives and suggest the best material.
Q: How to get sample?
A: Free sample is available for your quality evaluation, but you should pay the freight. Regarding customize products, sample and mould order will go first before mass production.
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