China wholesaler Di Water Pipe Fitting Cast Iron Universal HDPE Flange Adaptor Coupling for Ductile Iron Pipe universal coupling

Product Description

             Di Water Pipe Fitting Cast Iron Universal HDPE Flange Adaptor Coupling for Ductile Iron Pipe

Range of usage
Based on the excellent overall performance, the flexible rubber expansion joint is widely used in chemical industry, construction, drainage, oil industry, light and heavy industry, refrigeration industry, sanitary system, plumbing system, firefighting, and power electrics, such as the connection with pump or valve and pipeline with vibration or large temperature changes.

Material list

 NO   NAME Material 
      1 Cover NR,NBR,EPDM
      2 Reinforcing Nylon
      3 Tube NR,NBR,EPDM
     4 Retain rings Steel
     5 Flange Carbon steel

Technical conditions

Working Pressure   
1(10) 1.6(16) 2.5(25)
Explosion Pressure
3 (30) 4.8 (48) 5.5 (55)
53.3(400) 86.7(650) 100(750)
Applicable Temperature ºC
-15-115, it can be -30-250 for special condition. 
Applicabe Medium
Air, compressed air, water,sea water, steam, oil, acid and alkali, etc

Main joint dimension


Length Extension Compression  
DN32 1 1/4″ 95 6 9 9 15°
DN40 1 1/2″ 95 6 10 9 15°
DN50 2″ 105 7 10 10 15°
DN65 2 1/2″ 115 7 13 11 15°
DN80 3″ 135 8 15 12 15°
DN100 4″ 150 10 19 13 15°
DN125 5″ 165 12 19 13 15°
DN150 6″ 180 12 20 14 15°
DN200 8″ 210 16 25 22 15°
DN250 10″ 230 16 25 22 15°
DN300 12″ 245 16 25 22 15°
DN350 14″ 255 16 25 22 15°
DN400 16″ 255 16 25 22 15°
DN450 18″ 255 16 25 22 15°
DN500 20″ 255 16 25 22 15°
DN600 24″ 260 16 25 22 15°
DN700 28″ 260 16 25 22 15°
DN800 32″ 260 16 25 22 15°
DN900 36″ 260 16 25 22 15°
DN1000 40″ 260 18 26 24 15°

1. The flexible rubber expansion joint is of small volume, light weight, good flexibility and convenient installation and maintenance ; 

2. The flexible rubber expansion joint has transverse displacement, axial displacement and angular displacement and not restricted by inconsistent pipeline and unparallel flange in installation; 

3. The flexible rubber expansion joint reduces vibration and noise;

4. The flexible rubber expansion joint with seamless inside and resistance to high temperature which is developed by our      company can prevent the corrosive medium from corroding the inner wall more efficiently in the pipeline of high temperature resistance, acid and alkali resistance and oil resistance.

universal coupling

Can a Universal Coupling Be Used to Connect Shafts of Different Sizes or Types?

Yes, one of the key advantages of a universal coupling is its ability to connect shafts of different sizes or types. Universal couplings are designed to accommodate misalignment between shafts, including angular, parallel, and axial misalignment.

The design of the universal coupling allows it to transmit torque and rotation between two shafts that are not perfectly aligned. This feature is particularly beneficial in situations where precise alignment is challenging or not possible due to equipment design, manufacturing tolerances, or operating conditions.

The universal coupling consists of two jointed forks, each connected to one of the shafts. The forks are connected by a cross-shaped component called the spider or cross assembly. The spider allows for the transfer of torque while allowing the shafts to move independently of each other to a certain degree.

The ability to accommodate misalignment makes universal couplings suitable for various applications, including automotive steering systems, industrial machinery, pumps, and marine equipment. Whether the shafts have different sizes or types, the universal coupling provides a flexible connection that helps minimize stress on the shafts and other connected components.

universal coupling

How do you calculate the required size and specifications for a half coupling?

Calculating the required size and specifications for a half coupling involves considering several factors to ensure a proper fit and secure connection. Here are the steps to calculate the required size and specifications:

1. Pipe Size: Determine the size of the pipe that the half coupling will connect to. Pipe sizes are typically specified in inches, and the half coupling size should match the pipe size.

2. Pipe Material: Identify the material of the pipe, such as stainless steel, PVC, carbon steel, brass, copper, etc. The half coupling material should be compatible with the pipe material to prevent corrosion and ensure a reliable connection.

3. Pressure Rating: Determine the maximum operating pressure of the system. The half coupling should have a pressure rating that meets or exceeds the system’s operating pressure to ensure safety and performance.

4. Temperature Rating: Consider the maximum and minimum operating temperatures of the system. The half coupling material and design should be suitable for the temperature range to prevent deformation or failure.

5. Alignment and Misalignment: Evaluate the alignment and potential misalignment between the pipes. Some half couplings are designed to accommodate angular, parallel, or axial misalignment, providing flexibility in installation.

6. End Connection: Determine the type of end connection required for the half coupling, such as threaded, weld-on, or flanged. The end connection should match the corresponding connection on the pipe.

7. Corrosion Resistance: Consider the environment in which the half coupling will be installed. For corrosive environments, select a half coupling material with suitable corrosion resistance.

8. Industry Standards: Ensure that the selected half coupling complies with relevant industry standards and certifications for quality and safety.

9. Manufacturer Guidelines: Follow the manufacturer’s guidelines and recommendations for selecting the appropriate half coupling size and specifications based on the application requirements.

It is essential to consult with coupling manufacturers, suppliers, or industry experts if you are unsure about the correct size and specifications for the half coupling. Proper sizing and selection will ensure a reliable and efficient connection in the piping system.

universal coupling

Advantages of Using a Universal Coupling in a Drive System

A universal coupling, also known as a universal joint or U-joint, offers several advantages when used in a drive system:

  • Flexibility: Universal couplings can transmit torque and rotation between shafts that are not in a straight line and have angular misalignment. This flexibility allows for easier design and installation of the drive system, especially in applications where the shafts are not perfectly aligned.
  • Angular Misalignment Compensation: The universal joint can handle angular misalignment between the connected shafts, making it suitable for applications where the shafts are at different angles to each other. This feature helps reduce stress on the shafts and bearings, leading to extended component life.
  • Smooth Power Transmission: The double universal joint, also known as the double Cardan joint, can reduce the angular variation between the input and output shafts, resulting in smoother power transmission and reduced vibration in certain applications.
  • Constant Velocity: The constant velocity joint (CV joint) maintains a constant velocity ratio between the input and output shafts. This is particularly important in automotive drive shafts, especially in front-wheel-drive vehicles, where the drive shafts must adjust to changing angles as the wheels turn. The constant velocity feature provides a smoother ride and reduces vibration.
  • Compact Design: Universal couplings have a relatively simple design, which allows for a compact and lightweight construction. This is advantageous in applications where space and weight are critical factors.
  • Cost-Effective: Universal couplings are cost-effective compared to some other types of couplings, making them a popular choice for various mechanical systems.
  • Reliability: When properly lubricated and maintained, universal couplings can provide reliable and efficient power transmission for a long service life.
  • Versatility: Universal couplings are versatile and find applications in various industries, including automotive, aerospace, marine, industrial machinery, and power transmission systems.

In conclusion, the universal coupling’s ability to handle misalignment and provide flexibility in power transmission makes it a valuable component in many drive systems. Its advantages in compensating for angular misalignment, ensuring smooth power transmission, and offering a cost-effective and reliable solution have contributed to its widespread use in different mechanical applications.

China wholesaler Di Water Pipe Fitting Cast Iron Universal HDPE Flange Adaptor Coupling for Ductile Iron Pipe  universal couplingChina wholesaler Di Water Pipe Fitting Cast Iron Universal HDPE Flange Adaptor Coupling for Ductile Iron Pipe  universal coupling
editor by CX 2023-10-06