China Standard DIN BS Universal Wide Range Flexible Ductile Iron Straight Coupling

Product Description

Universal Wide Range Flexible Ductile Iron Straight Coupling


1 Body BSEN1563 EN-GJS(QT)-450-10/Carbon Steel
2 Gland BSEN1563 EN-GJS(QT)-450-10
3 Seals EPDM/NBR
4 Fasteners Stainless Steel/Carbon Steel with Dacromet Coating/GAL Carbon Steel
5 Coating Fusion Bonded Epoxy

(mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (Nm)
50 59-72 188 148 95 72 76 153 4-M12*180 55-65 4.1
65 72-85 188 148 95 85 89 173 4-M12*180 55-65 4.1
80 88-103 188 146 95 103 107 185 4-M12*180 55-65 4.1
100 109-128 188 146 95 127 132 208 4-M12*180 55-65 4.6
125 138-153 198 153 95 158 162 256 4-M12*190 55-65 8.3
150 159-182 198 153 95 182 186 280 4-M12*190 55-65 8.5
175 189-212 233 187 130 211 216 329 4-M12*225 55-65 9.0 
200 218-235 233 187 130 234 239 333 4-M12*225 55-65 10.6
225 242-262 233 185 130 261 265 379 6-M12*225 55-65 14.5
250 272-289 233 186 130 288 295 391 6-M12*225 55-65 15.4
300 315-349 233 187 130 349 352 464 6-M12*225 55-65 20.0 
322-339 233 187 130 338 345 444 6-M12*225 55-65 23.1
338-360 233 187 130 359 366 460 6-M12*225 55-65 23.1
350 351-391 250 187 130 390 395 502 10-M12*225 55-65 26.8
400 400-442 250 187 130 441 446 558 10-M12*225 55-65 31.9
450 455-493 250 187 130 492 497 608 10-M12*225 55-65 36.6
500 500-599 250 187 130 598 594 662 10-M12*225 55-65 40.0 
600 600-692 250 187 130 691 697 768 10-M12*225 55-65 42.0 
700 708-780 250 187 130 779 785 910 10-M12*225 55-65 45.0 


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flexible coupling

How do flexible couplings handle axial movement in rotating machinery?

Flexible couplings are designed to handle different types of misalignments in rotating machinery, including axial movement or axial misalignment. Axial movement occurs when there is displacement along the axis of rotation, causing one shaft to move closer to or away from the other shaft. Here’s how flexible couplings handle axial movement:

  • Sliding Capability: Many flexible couplings, especially those with elastomeric elements or certain designs, can slide along the shafts they connect. This sliding capability allows the coupling to accommodate axial movement without introducing additional stress on the connected components. The elastomeric elements can compress or stretch slightly to absorb the axial displacement.
  • Multiple-piece Designs: Some flexible couplings consist of multiple pieces, which allow for axial movement. These designs often have a floating member or a spacer that separates the two shaft-connected components. The floating member can move axially as needed, while still transmitting torque and compensating for other misalignments.
  • Double-Cardanic Design: Certain high-performance flexible couplings use a double-cardanic design, allowing for misalignment in multiple directions, including axial movement. This design features two sets of flexible elements that work together to accommodate different misalignments and provide a high degree of flexibility.

It’s important to note that while flexible couplings can handle a certain degree of axial movement, excessive axial misalignment might require a different type of coupling or additional measures to be addressed properly.

During the selection and installation process, it’s essential to consider the application’s axial movement requirements and choose a flexible coupling that can accommodate the expected axial displacement while still providing the desired performance, such as vibration damping, shock absorption, or precision motion control.

flexible coupling

Can flexible couplings be used in pumps, compressors, and fans?

Yes, flexible couplings can be used in pumps, compressors, and fans, and they are commonly employed in these types of rotating machinery. Flexible couplings offer several advantages that make them suitable for such applications:

  • Misalignment Compensation: Pumps, compressors, and fans often experience misalignments due to various factors, such as thermal expansion, foundation settling, or component wear. Flexible couplings can accommodate angular, parallel, and axial misalignments, helping to maintain proper alignment between the driving and driven components.
  • Vibration Damping: Flexible couplings help dampen vibrations in rotating machinery, which is essential for smooth operation and reduced wear on components. In pumps, compressors, and fans, vibration control is crucial to prevent premature failure and maintain reliable performance.
  • Shock Load Absorption: These rotating machines may encounter shock loads during startup or shutdown, especially in reciprocating equipment like reciprocating pumps or compressors. Flexible couplings can absorb and mitigate the impact of such loads, protecting the connected equipment from damage.
  • Reduced Maintenance: Flexible couplings with elastomeric elements or other self-lubricating features require minimal maintenance, leading to cost savings and reduced downtime in pumps, compressors, and fans.
  • Energy Efficiency: Certain flexible coupling designs, such as beam couplings or certain elastomeric couplings, have low mass and inertia. This characteristic helps improve the energy efficiency of rotating machinery, which is particularly beneficial in large-scale pumps, compressors, and fans used in industrial applications.
  • Adaptability: Pumps, compressors, and fans often have varying operating conditions and load profiles. Flexible couplings are adaptable to different operating environments, making them suitable for diverse applications.

In summary, flexible couplings offer several performance-enhancing features that make them well-suited for use in pumps, compressors, and fans. Their ability to accommodate misalignment, dampen vibrations, absorb shocks, and reduce maintenance requirements contributes to improved reliability, efficiency, and longevity of the connected rotating machinery.

flexible coupling

How does a flexible coupling handle angular, parallel, and axial misalignment?

A flexible coupling is designed to accommodate various types of misalignment between two rotating shafts: angular misalignment, parallel misalignment, and axial misalignment. The flexibility of the coupling allows it to maintain a connection between the shafts while compensating for these misalignment types. Here’s how a flexible coupling handles each type of misalignment:

  • Angular Misalignment: Angular misalignment occurs when the axes of the two shafts are not collinear and form an angle with each other. Flexible couplings can handle angular misalignment by incorporating an element that can flex and bend. One common design is the “spider” or “jaw” element, which consists of elastomeric materials. As the shafts are misaligned, the elastomeric element can deform slightly, allowing the coupling to accommodate the angular offset between the shafts while still transmitting torque.
  • Parallel Misalignment: Parallel misalignment, also known as offset misalignment, occurs when the axes of the two shafts are parallel but not perfectly aligned with each other. Flexible couplings can handle parallel misalignment through the same elastomeric element. The flexible nature of the element enables it to shift and adjust to the offset between the shafts, ensuring continuous power transmission while minimizing additional stresses on the machinery.
  • Axial Misalignment: Axial misalignment, also called end-play misalignment, occurs when the two shafts move closer together or farther apart along their common axis. Flexible couplings can handle axial misalignment through specific designs that allow limited axial movement. For instance, some couplings use slotted holes or a floating member that permits axial displacement while maintaining the connection between the shafts.

By providing the capability to handle angular, parallel, and axial misalignment, flexible couplings offer several advantages for power transmission systems:

  • They help to prevent premature wear and damage to the connected equipment, reducing maintenance and replacement costs.
  • They minimize vibration and shock loads, enhancing the overall smoothness and reliability of the machinery.
  • They reduce the risk of equipment failure due to misalignment-induced stresses, improving the system’s operational life.
  • They allow for easier installation and alignment adjustments, saving time and effort during setup and maintenance.

Overall, flexible couplings play a crucial role in handling misalignment and ensuring efficient power transmission in various industrial applications.

China Standard DIN BS Universal Wide Range Flexible Ductile Iron Straight Coupling  China Standard DIN BS Universal Wide Range Flexible Ductile Iron Straight Coupling
editor by CX 2024-04-08