Hinged Expansion Bellows

Product Description

Hinged Expansion Bellows (or Hinged Expansion Joints) are designed to allow angular movement in a single plane while restricting axial or lateral movement. Here™s what they typically contain or consist of:

Main Components of Hinged Expansion Bellows:

1. Bellows Element:

   • The flexible core that accommodates movement.

   • Made from stainless steel (e.g., SS 304, SS 316L, Inconel).

2. Hinges (Hinge Assemblies):

   • Two hinge plates (arms) connected with a pin.

   • Allow angular movement in one plane only.

   • Restrict axial and lateral movements.

   • Often made from carbon steel or stainless steel.

3. End Connections:

   • Weld ends, flanges, or threaded ends.

   • Connect the bellow to the pipeline or equipment.

4. Gussets / Lugs (part of hinge assembly):

   • Provide support for hinge arms and distribute loads.

5. Stops or Limit Devices (optional):

   • To control the maximum angular movement.

   • May include pins, blocks, or tie rods depending on design.

Functional Purpose:

• Allows angular deflection only (not axial or lateral).

• Typically used in pairs or sets of three to absorb thermal expansion in piping systems by redirecting the movement.

• The hinges carry pressure thrust, protecting anchors and the rest of the system.

Typical Materials Used: