China wholesaler 2018 Most Popular Ball Rubber Expansion Joint Fittings Bellow Coupling

Product Description

Single Sphere Rubber Bellows,2018 most popular ball rubber expansion joint fittings bellow coupling


Rubber expansion joint advantage:


A: 15 minutes zinc plating, high pressure resistance, high temperature resistance, oil resistance, wear resistance, corrosion resistance, acid and alkali resistance. 

B:Connect with pump, valve, fire fighting equipment, pipe which vibrate big, pipe which hot and cold change frequently.

C: Natural rubber content of 40-7 percent, can continue to use for 15 years without aging.



The form: this rubber expansion joint consists of rubber pipe, made of inner glue, multi-layer proofinf and cord fabric and outer glue abd metal woggle joint.
It is applicable for the connection of inlet and outlet pipes of various fancoil sets of air conditionings in the guest rooms of hotels and restaurants.

Product Feature

  • The rubber joint can greatly reduce pipeline system vibration and noise, can solve the problem of joint displacement, axial expansion, etc.
  • According to different materials, it can be made into many kinds, adapt to many mediums and different environment.
  • Good sealing rubber, light weight, easy installation, long service life, and avoid contacting with sharp metal device.
  • If use overhead, can match with elastic support.
  • If pipeline pressure is high, should use bolt connect the flange both ends.

Technical Parameters

Nominal diameter(mm) 32~1200 32~1200
Nominal pressure(Mpa)  1.0  1.6
Testing pressure Seal(Mpa) 1.1 1.76
Suitable temperature(°C) -20°C~120°C
Suitable medium Drinking water,sewage,seawater,food,medicines,gas,oil and acid

Main Raw Material

Flange WCB Cold/Hot Galvanizing

Reference Standard

Testing standard API 598
End flange standard DIN PN10 / PN16,ANSI 125# / 150#,BS4504 PN10 / PN16

Overall Dimension and Weight


Size ΦD1 ΦD2 N-Φd D d Extension Compression


displacement (mm)





DN32 140 100 4-18 95 16 6 9 9  
DN40 150 110 4-18 95 18 6 10 9  
DN50 165 125 4-19 105 18 7 10 10  
DN65 185 145 4-19 115 20 7 13 11  
DN80 200 160 8-19 135 20 8 15 12  
DN100 220 180 8-19 150 22 10 19 13  
DN125 250 210 8-19 165 24 12 19 13  
DN150 285 240 8-23 180 24 12 20 14  
DN200 340 295 12-23 210 24 16 25 22  
DN250 405 355 12-28 230 28 16 25 22  
DN300 460 410 12-28 245 28 16 25 22  
DN350 520 470 16-28 255 28 16 25 22  
DN400 580 525 16-31 255 30 16 25 22  
DN450 640 585 20-31 255 30 16 25 22  
DN500 715 650 20-34 255 32 16 25 22  
DN600 840 770 20-37 260 36 16 25 22  
DN700 910 840 24-37 320 36 16 25 22  
DN800 1571 950 24-41 340 36 16 25 22  
DN900 1125 1050 28-41 370 36 16 25 22  
DN1000 1255 1170 28-44 400 36 18 26 24  
DN1200 1485 1390 32-50 420 36 18 26 24  


Why Choose US

We test leakage of each roll before braiding, then we cut 300mm and crimp it to test
burst pressure after brading.

We use CNC Lathes Machine for end fittings production. Machine system, knife and inspection
tools are all imported from Japan.

We use Techmaflex Crimping Machine which is imported from France. This machine has
accurate and stable performance for crimping because it is produced for PTFE hose crimping only.

Contact to this supplier

rubber coupling

Suitability of Rubber Couplings for High-Speed Rotation and Varying Loads

Rubber couplings are generally well-suited for applications involving high-speed rotation and varying loads, thanks to their unique properties and design features.

High-Speed Rotation: Rubber couplings can effectively handle high-speed rotation due to their inherent flexibility and damping characteristics. The elastomeric material used in rubber couplings helps absorb and dissipate vibrations that can occur at high speeds, contributing to smoother operation and reduced wear on connected machinery components.

Varying Loads: Rubber couplings are capable of accommodating varying loads due to their ability to deform under stress. The flexibility of rubber allows it to absorb shocks and impacts caused by changes in load, preventing damage to connected equipment. This feature is particularly beneficial in applications where sudden changes in load can occur, such as in industrial machinery.

However, it’s important to consider the specific requirements of the application. While rubber couplings provide excellent vibration isolation and misalignment compensation, they may not offer the same level of torsional rigidity as some other coupling types. In cases where precise torque transmission is crucial, and minimal torsional deflection is required, other coupling options might be more suitable.

Overall, rubber couplings can provide reliable performance in applications involving high-speed rotation and varying loads, especially when the benefits of vibration damping and misalignment compensation are essential.

rubber coupling

Comparison of Rubber Couplings with Other Flexible Coupling Types

Rubber couplings, elastomeric couplings, and disc couplings are all flexible coupling options used in various mechanical systems. Here’s a comparison of rubber couplings with these alternatives:

Rubber Couplings:

  • Transmit torque while damping vibrations through the flexibility of rubber elements.
  • Provide good misalignment compensation and shock absorption.
  • Relatively simple construction and cost-effective.
  • Effective in reducing noise and vibration in applications.
  • Suitable for moderate to high torque applications with moderate misalignment.

Elastomeric Couplings:

  • Similar to rubber couplings, utilize elastomeric materials for flexibility and vibration damping.
  • Offer higher torque capacity and stiffness compared to rubber couplings.
  • Provide better misalignment compensation and torsional stiffness.
  • Wider range of sizes and configurations for various applications.
  • Commonly used in pumps, compressors, and other machinery.

Disc Couplings:

  • Use a series of metal discs to transmit torque and accommodate misalignment.
  • Offer high torsional stiffness and accuracy in torque transmission.
  • Can handle higher speeds and torque compared to rubber or elastomeric couplings.
  • Require precision in manufacturing and installation.
  • Used in applications requiring high precision and minimal backlash.

When choosing between these flexible coupling types, considerations such as torque requirements, misalignment compensation, torsional stiffness, and application-specific needs play a significant role in making the appropriate selection. Each type has its advantages and limitations, making it important to assess the specific requirements of the machinery system.

rubber coupling

Factors to Consider When Selecting a Rubber Coupling

Choosing the right rubber coupling for a specific application involves considering various factors:

1. Torque Requirements: Evaluate the torque that needs to be transmitted between the input and output shafts. Select a coupling with a rubber element that can handle the required torque without exceeding its limits.

2. Misalignment Compensation: Determine the degree of misalignment (angular, axial, and radial) present in the system. Choose a rubber coupling with appropriate flexibility to accommodate the expected misalignment while maintaining efficient torque transmission.

3. Vibration Damping: Assess the level of vibrations and shocks in the application. Opt for a rubber coupling with effective vibration-damping properties to protect the machinery and enhance its reliability.

4. Service Environment: Consider the operating conditions, including temperature, humidity, exposure to chemicals, and potential contaminants. Select a rubber material that can withstand the environment without deteriorating.

5. Shaft Sizes: Ensure that the coupling’s bore sizes match the shaft diameters of the connected equipment. Proper shaft fitment is crucial for efficient torque transmission.

6. Maintenance Requirements: Evaluate the maintenance practices of the system. Some rubber couplings may require periodic inspection and replacement due to wear over time.

7. Cost and Budget: Factor in the budget constraints while choosing a suitable rubber coupling. Balancing performance and cost is essential for an optimal solution.

8. Application Type: Different industries and applications have unique requirements. Choose a coupling type (spider, jaw, tire, etc.) based on the specific needs of the application.

By carefully considering these factors, you can select a rubber coupling that provides efficient torque transmission, vibration isolation, and durability in your mechanical system.

China wholesaler 2018 Most Popular Ball Rubber Expansion Joint Fittings Bellow Coupling  China wholesaler 2018 Most Popular Ball Rubber Expansion Joint Fittings Bellow Coupling
editor by CX 2023-11-27

rubber coupling

As one of leading rubber coupling manufacturers, suppliers and exporters of products, We offer rubber coupling and many other products.

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