China Best Sales FM / UL Approved Ductile Iron Grooved Coupling Rigid Coupling

Product Description

Ductile Iron Grooved Pipe Coupling
We can also produce according to your drawings.

Size DN25-300(1″-12″) or as customer’s requirement
Material Ductile iron or ferritic nodular iron
Standard DIN, ASTM, JIS, ANSI etc. Or according to customer’s drawing
Surface Furnish: Red painted, orange painted, galvanized, red spraied, orange spraied, dacromet, epoxy powder, epoxy, electroplate, galvanized+epoxy, etc.
Pressure 300PSI, 450PSI, 500PSI, or as request
Applications: Fire protection, Water supply system, General pipe system, Air-conditioning, Sewage system, Cement pipe system, Mine pipe systems
Packing: 1 )Packed in cartons and then packaged in pallet which will be covered by plastic film.
2)In fumigation-free wooden case
ADVANTAGE: Easy to assemble and disassembel, easy to operate
Engineering Tests: Vaccum Test, Hydrostatic Strength Test,
Air Leakage TEST, Moment Test,
Hot Gasket Test, Cold Gasket Test, Flame Test,
Cycling Pressure Resistance(Water Heamer Test),
Friction Loss Determination, Leakage Test-Assembly without Gasket,
Torsion Test, Flexibility Test for Flexible Fittings, Seismic Evaluation,
Lateral Displacement, Hydrostatic Fluctuation Pressure Test, Fire Test

 Flexbile Coupling
Nominal Size mm/in Pipe O.D mm/in Working Pressure PSI/MPa Dimensions mm/in
25              33.7   300  55.     95     45   
1      1.327 2.07 2.165 3.74 1.772
32       42.4   300  65  105   45   
1.669 2.07 2.559 4.133 1.772
40    48.3   300   71.   110     4.331 45   
1.9 2.07 2.795 1.772
50  60.3  300  82     124   45   
2 2.375 2.07 3.228 4.882 1.772
65  73.0   300  98      141 45   
2.875 2.07 3.858 5.551 1.772
65  76.1   300  100   142   45   
3OD 3 2.07 3.937  5.59 1.772
80  88.9  300  113    160  46   
3 3.5 2.07 4.449  6.299 1.811
100  114.3  300  142    190   49  
4 4.5 2.07 5.59 7.48 1.929
125  139.7 300  168    218   49  
5.5OD 5.5 2.07 6.614 8.583 1.929
150   165.1  300  194    244   49  
6.5OD 6.5 2.07 7.638 9.606 1.929
150  168.3       6.625 300  198    248  49  
6 2.07 7.795 9.764 1.929
200 219.1  300  256.   320  60   
8 8.625 2.07 10.079 12.598 2.362
250  273  300  328   420  64   
10 10.748 2.07 12.913 16.535 2.52
300  323.9  300  380   454  64   
12 12.752 2.07 14.961 17.874 2.52

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rigid coupling

Can Rigid Couplings Handle Misalignment Between Shafts?

Rigid couplings are not designed to handle misalignment between shafts. Unlike flexible couplings that can accommodate slight misalignment through their bending or elastic properties, rigid couplings are intended to provide a fixed and immovable connection between two shafts. As a result, any misalignment between the shafts can lead to increased stress and uneven loading on connected components.

It is essential to ensure precise alignment when using rigid couplings to avoid premature wear and failure of the system. The shafts must be perfectly aligned in both the axial and angular directions before installing the rigid coupling. Proper alignment helps distribute the load evenly and reduces stress concentration on specific areas, such as bearings and keyways.

If a system requires some level of misalignment compensation due to factors like thermal expansion or slight shaft deflection, a flexible coupling should be considered instead. Flexible couplings can tolerate small degrees of angular and axial misalignment while still transmitting torque efficiently and protecting the connected equipment from excessive stress and wear.

In summary, rigid couplings are best suited for applications where precise shaft alignment can be achieved and maintained, while flexible couplings are more appropriate for systems with potential misalignment or other dynamic factors that require some degree of flexibility.

rigid coupling

Can Rigid Couplings Be Used in Applications with Varying Operating Temperatures?

Rigid couplings are versatile mechanical components that can be used in a wide range of applications, including those with varying operating temperatures. However, the selection of the appropriate material for the rigid coupling is crucial to ensure its reliable performance under different temperature conditions.

Material Selection: The choice of material for the rigid coupling depends on the specific operating temperature range of the application. Common materials used in manufacturing rigid couplings include steel, stainless steel, and aluminum, among others. Each material has its own temperature limitations:

Steel: Rigid couplings made from steel are suitable for applications with moderate to high temperatures. Steel couplings can handle temperatures ranging from -40°C to around 300°C, depending on the specific grade of steel used.

Stainless Steel: Stainless steel rigid couplings offer higher corrosion resistance and can be used in applications with more demanding temperature environments. They can withstand temperatures from -80°C to approximately 400°C.

Aluminum: Aluminum rigid couplings are commonly used in applications with lower temperature requirements, typically ranging from -50°C to around 120°C.

Thermal Expansion: When selecting a rigid coupling for an application with varying temperatures, it is essential to consider thermal expansion. Different materials have different coefficients of thermal expansion, meaning they expand and contract at different rates as the temperature changes. If the operating temperature fluctuates significantly, the thermal expansion of the rigid coupling and the connected components must be carefully accounted for to avoid issues with misalignment or binding.

Extreme Temperature Environments: For applications with extremely high or low temperatures beyond the capabilities of traditional materials, specialized high-temperature alloys or composites may be required. These materials can withstand more extreme temperature conditions but may come with higher costs.

Lubrication: The choice of lubrication can also play a role in the suitability of rigid couplings for varying temperature applications. In high-temperature environments, consideration should be given to using high-temperature lubricants that can maintain their effectiveness and viscosity at elevated temperatures.

In conclusion, rigid couplings can indeed be used in applications with varying operating temperatures, but careful material selection, consideration of thermal expansion, and appropriate lubrication are essential to ensure reliable and efficient performance under changing temperature conditions.

rigid coupling

Limitations and Disadvantages of Using Rigid Couplings:

Rigid couplings offer several advantages in providing a strong and direct connection between shafts, but they also have certain limitations and disadvantages that should be considered in certain applications:

  • No Misalignment Compensation: Rigid couplings are designed to provide a fixed connection with no allowance for misalignment between shafts. As a result, any misalignment, even if slight, can lead to increased stress on connected components and cause premature wear or failure.
  • Transmit Shock and Vibration: Rigid couplings do not have any damping or vibration-absorbing properties, which means they can transmit shock and vibration directly from one shaft to another. In high-speed or heavy-duty applications, this can lead to increased wear on bearings and other components.
  • No Torque Compensation: Unlike flexible couplings, rigid couplings cannot compensate for torque fluctuations or angular displacement between shafts. This lack of flexibility may not be suitable for systems with varying loads or torque requirements.
  • Higher Stress Concentration: Rigid couplings can create higher stress concentration at the points of connection due to their inflexibility. This can be a concern in applications with high torque or when using materials with lower fatigue strength.
  • More Challenging Installation: Rigid couplings require precise alignment during installation, which can be more challenging and time-consuming compared to flexible couplings that can tolerate some misalignment.
  • Increased Wear: The absence of misalignment compensation and vibration absorption can lead to increased wear on connected components, such as bearings, shafts, and seals.
  • Not Suitable for High Misalignment: While some rigid couplings have limited ability to accommodate minor misalignment, they are not suitable for applications with significant misalignment, which could lead to premature failure.

Despite these limitations, rigid couplings are still widely used in many applications where precise alignment and a strong, permanent connection are required. However, in systems with significant misalignment, vibration, or shock loads, flexible couplings may be a more suitable choice to protect the connected components and improve overall system performance and longevity.

China Best Sales FM / UL Approved Ductile Iron Grooved Coupling Rigid Coupling  China Best Sales FM / UL Approved Ductile Iron Grooved Coupling Rigid Coupling
editor by CX 2024-04-11

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

Please contact us for details.

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