Bellow Couplings Manufacturer In India

Expansion Joints / Bellows Design

Basics of Expansion Joints design
Expansion Joints are designed based on following parameters.
1. Material
2. Movement - Axial/lateral/Angular/Vibration
3. Temperature - Operating and Design
4. Pressure - Operating and Design
5. Spring Rate - Axial/lateral/Angular
6. Media
7. End Fittings

Expansion Joints Manufacturers Association (EJMA)

1. Currently EJMA version 10

2. Parameters entered
    I. Material
    II. Movement - Axial/lateral/Angular/Vibration
    III. Temperature - Operating and Design
    IV. Pressure - Operating and Design
    V. Pitch and Depth.
    VI. Sheet thickness and No. of plys.
    VII. No. of convolutions

3. Cycle Life

Types of movements covered in Bellows Expansion Joints design.

• Centerline remains in its original position.
• Expansion joint length increases/decreases only in in the direction of centerline
Expansion Joints

• Centerline moves at a certain degree with respect to its original position
• Flange faces stay parallel to each other

Expansion Joints

Angular :
• Centerline creates an arc while the flanges create angle to each other.
• Expansion joint length increases/decreases as per the curvature of arc

Expansion Joints

Torsional :
• The flange/bellow movement rotates in opposite direction with respect to each other.
• Flange faces stay parallel to each other.
• Expansion joints are not designed for these movements.

Expansion Joints


Sample design sheet

Expansion Joints


+ 91 - 70289 97949
+ 91 - 98904 54224
+ 91 - 98909 77244
Address: Final plot no.38/1 Ramtekdi Industrial Estate, Hadapsar, Pune - 411013, Maharashtra, India