Product Description

SS316 Flange connection ripple compensator coupling for tube Big size telescopic expansion bellows joint flangeless with PTFE

Products Description

The single unrestrained metal expansion joint comes with 1 bellows section and end connections.It can be equipped with all kinds of connectors, such as pipe weld ends or flanges. This expansion joint is mainly intended to absorb movements of axial expansion, both thermal and mechanical. In addition, to a lesser extent, it can absorb angular and lateral movements. It does not restrain pressure thrust so adequate anchors and guides must be provided and they can be used only in piping systems that incorporate correctly designed anchors and pipe alignment guides.

Product Parameters

bellows compensation
stiffness max size of
radial direction
total length
product type
active area A
corrugation number
Yo (mm)
θ± (°)
axial direction
lateral direction
angular direction
Nm/ (°)
connection type
adapter pipe
corrugated compensator:design pressure Pd = 1.0Mpa(10Kgf/ cm2)fatigue life[ N ]=1000times design temperature t = 20ºC
40 38 4 5.5 1.2 4 282 1214 14 145 230 240 TB
8 1.1 5 8 141 135 6.5 300 310
50 56 4 7.5 1.5 4 388 1790 20 157 250 260
8 15 6.5 8 194 189 7 340 350
65 79 4 9 1.5 4 422 2109 24 186 250 260
8 18 6.5 8 211 217 9 360 370
80 138 4 11 2 3 658 2715 28 219 354 270
8 22 8 6 329 320 13 364 380
100 155 4 12 2.3 3 698 3226 30 283 284 300
8 24 9.1 6 349 403 15 364 380
150 300 4 11 1.5 3 1009 9571 84 289 284 300
8 22 6.1 6 504 1129 42 364 380
200 535 4 17 2.6 3 1493 1571 222 389 380 400
8 34 10 6 746 1324 111 500 520
250 779 4 16 2.1 3 1850 19116 400 443 3H0 400
8 33 8.3 6 925 2390 200 500 520
300 1075 4 21 2.8 3 1536 15211 459 495 426 450
8 42 11 6 768 1901 229 570 594
350 1269 4 21 5.9 3 1682 19653 593 577 426 450
8 42 12 6 841 2457 296 570 594
400 1619 4 20 22 2.6 1917 28582 862 626 426 450
  8 41 8.6 5 958 3573 431 570 594
450 2003 4 20 1.9 2.3 2148 39632 1195 678 426 450
8 40 7.7 4.6 1074 4954 598 570 594
500 2428 4 20 1.7 2 2380 53229 1605 729 426 450
8 40 6.9 4 1190 6654 803 570 594
600 3473 4 36 4.3 3 1561 17977 1506 830 576 600
8 71 17 6 781 2247 753 816 840


Technical Drawing


Packing and Shipping

Company Profile

 We supply innovative expansion joint solutions to meet the world’s pipe expansion needs. We’ve grown to serve customers in the electric power, oil and petrochemical, pulp and paper, industrial and heavy equipment suppliers and a variety of OEM markets. We manufacture metal bellows and fabric expansion joints from DN50 to 10000mm diameter with different temperature.The pressure ranges for these designs range from full vacuum to 120 MPa.


1. Q. Can I get the samples?
        A. Yes, small size sample is free, but buyer need pay for freight cost.
2. Q. What is Minimum Order Quantity?
        A.The MOQ is according to the type and size.
3. Q.Can you manufacture based on my drawing or specification?
        A.Yes, customized drawing or specification is available, just send us your requirements.
4. Q.What price terms do you accept?
        A.Ex factory price, FOB price. We’ll also be pleased to make CNF/CFR/CIF price for you.
5. Q.What standard can you make?
        A. EJMA, ASME, MIL-E, BS, JIS, CODAP, etc.

We need to know following information to quote you correct machineries:
1.Technical Drawing of the expansion joint you need?
2.What size you need?
3. Material of the bellows, pipe ends or flange?
4.What diameter of the expansion joint you need?
5.working pressure
7.Working temperature
9.Connection: Welding pipe ends or flange (ANSI, DIN, JIS,BS, AS,GOST, etc..)

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bellows coupling

How Do Bellows Couplings Contribute to Reducing Vibrations and Ensuring Smooth Operation?

Bellows couplings play a crucial role in reducing vibrations and ensuring smooth operation in mechanical power transmission systems. They achieve this through their unique design and material characteristics, which allow them to absorb and dampen vibrations effectively. Here’s how bellows couplings contribute to minimizing vibrations and promoting smooth operation:

  • Flexible Bellows Design: Bellows couplings feature a thin-walled, accordion-like structure known as the bellows. This design provides flexibility in multiple directions, allowing the coupling to compensate for minor misalignments and shaft movements. The bellows’ flexing action absorbs shocks and vibrations, preventing them from propagating through the system and reducing the transmission of vibration to connected equipment.
  • Vibration Damping: The flexible bellows act as a vibration damper, absorbing and dissipating vibrational energy generated during the operation. When the system experiences dynamic forces or sudden shocks, the bellows expand and contract to absorb these forces, preventing them from resonating throughout the system. This damping action helps maintain the stability of the machinery and prevents excessive wear and tear on components.
  • No Mechanical Contact: Unlike some coupling types that rely on friction or mechanical contact, bellows couplings transmit torque through pure flexure without any metal-to-metal contact. This feature eliminates backlash and torsional wind-up, further reducing vibration and ensuring smoother operation. As a result, bellows couplings are well-suited for applications requiring high precision and minimal vibration-induced errors.
  • High Torsional Stiffness: While bellows couplings are designed to be flexible, they still possess high torsional stiffness. This stiffness ensures accurate torque transmission without any loss, contributing to the overall efficiency and smoothness of the system’s operation.
  • Resonance Avoidance: Bellows couplings are designed to have specific critical speeds and resonant frequencies that prevent resonance from occurring within the coupling itself. Resonance can lead to severe vibration amplification, which can be detrimental to the equipment and surrounding components. The careful design of bellows couplings helps avoid such resonance issues.

By effectively dampening vibrations, absorbing shocks, and providing torsional stiffness, bellows couplings contribute to smoother operation, reduced mechanical wear, and increased overall system reliability. Their ability to handle misalignments and their high torsional stiffness make them a popular choice in precision motion control systems, robotics, and various industrial applications where smooth and accurate performance is essential.

bellows coupling

Can Bellows Couplings be Customized or Adapted to Specific Industrial Needs?

Yes, bellows couplings can be customized or adapted to meet specific industrial needs. Manufacturers of bellows couplings often offer a range of customization options to ensure that the couplings can effectively address the unique requirements of different applications and industries.

The customization options for bellows couplings may include:

  • Material Selection: Manufacturers can offer a variety of materials for the bellows coupling based on factors such as corrosion resistance, temperature tolerance, and mechanical properties. Different materials, such as stainless steel, aluminum, or specialized alloys, can be chosen to suit the specific demands of the application.
  • Size and Dimensions: Bellows couplings can be produced in various sizes and dimensions to accommodate different shaft diameters and spacing requirements. Custom sizing ensures a proper fit and optimal performance in the given system.
  • Design Modifications: Manufacturers can make design modifications to the bellows coupling to suit specific environmental conditions or to address unique challenges in a particular application. These modifications may include changes to the shape of the bellows, the number of convolutions, or the addition of protective features.
  • Electrical Isolation: For applications requiring electrical isolation between shafts, bellows couplings can be customized with insulating materials to prevent the flow of electric currents between the connected components.
  • Performance Enhancements: Couplings can be designed to provide enhanced performance characteristics, such as higher torque capacity or improved torsional stiffness, based on the requirements of the application.

By collaborating with coupling manufacturers or consulting with engineering experts, industrial users can outline their specific needs and constraints. This information helps in the customization or adaptation of bellows couplings to create a solution that optimally meets the demands of the intended application.

It is important to work closely with reputable coupling suppliers or manufacturers who have experience in providing customized solutions. Such collaboration ensures that the final bellows coupling design aligns with the intended industrial needs and delivers reliable and efficient performance in the designated application.

bellows coupling

What are the Different Types of Bellows Couplings Available, and Their Respective Applications?

There are several types of bellows couplings available, each designed to suit specific applications and requirements. Some of the most common types include:

  • Single Bellows Coupling: This type of bellows coupling consists of a single bellows element and is suitable for applications with moderate misalignment and torsional stiffness requirements. It is commonly used in robotics, automation, and general motion control systems.
  • Double Bellows Coupling: The double bellows coupling features two bellows elements with an intermediate shaft in between. This design offers higher torsional stiffness and increased angular misalignment capacity. It is often used in precision positioning equipment and applications requiring higher torque transmission.
  • Flexible Beam Coupling with Bellows: This type of coupling combines the flexibility of a beam coupling with the compensating capability of a bellows coupling. It can handle moderate misalignments and provides a good balance between flexibility and torsional stiffness. It finds applications in medical devices, optical systems, and semiconductor equipment.
  • Torsionally Rigid Bellows Coupling: As the name suggests, this coupling type offers exceptional torsional stiffness, making it suitable for applications where precise motion control and low torsional backlash are critical. It is commonly used in CNC machines, high-speed spindles, and other high-precision systems.
  • Miniature Bellows Coupling: This type is specifically designed for applications with limited space and where low inertia is crucial. It is commonly used in small robotics, miniature positioning stages, and micro-machining systems.
  • High-Temperature Bellows Coupling: This specialized coupling can withstand elevated temperatures, making it suitable for applications in harsh environments, such as aerospace, exhaust systems, and certain industrial processes.

The choice of bellows coupling type depends on the specific requirements of the application. Factors such as misalignment compensation, torsional stiffness, torque capacity, space constraints, and environmental conditions play a crucial role in selecting the appropriate coupling type.

When selecting a bellows coupling, it is essential to consider the coupling’s torque ratings, allowable misalignments, and operating conditions to ensure optimal performance and reliability. Consulting with coupling manufacturers or engineering experts can help in making an informed decision based on the specific needs of the mechanical power transmission system.

China manufacturer SS316 Flange Connection Ripple Compensator Coupling for Tube Big Size Telescopic Expansion Bellows Joint Flangeless with PTFE  China manufacturer SS316 Flange Connection Ripple Compensator Coupling for Tube Big Size Telescopic Expansion Bellows Joint Flangeless with PTFE
editor by CX 2024-05-03