What materials are commonly used in union and coupling?

 In mechanical engineering, union and coupling are used to connect pipes, shafts, or other components. 

The commonly used materials for these fittings include:

1. Metals

  • Steel: Offers high strength and durability, commonly used in heavy-duty applications.
  • Stainless Steel: Resistant to corrosion, ideal for applications involving water and chemicals.
  • Brass: Good corrosion resistance and machinability, often used in plumbing applications.
  • Aluminum: Lightweight and resistant to corrosion, suitable for less demanding applications.

2. Plastics

  • PVC (Polyvinyl Chloride): Commonly used in plumbing; lightweight and resistant to chemicals.
  • CPVC (Chlorinated Polyvinyl Chloride): Higher temperature resistance than PVC, used in hot water applications.
  • Polypropylene: Chemical resistant and used in various industrial applications.

3. Rubber and Elastomers

  • Used in flexible couplings and seals to absorb vibrations and accommodate misalignment.

4. Composite Materials

  • Combining different materials to achieve desired properties such as strength, weight reduction, or corrosion resistance.

These materials are selected based on factors like application requirements, environmental conditions, and cost considerations.



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