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. Heres what they typically contain or consist of:

Main Components of Hinged Expansion Bellows:

Bellows Element:

• The flexible core that accommodates movement.
• Made from stainless steel (e.g., SS 304, SS 316L, Inconel).

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.

End Connections:

• Weld ends, flanges, or threaded ends.
• Connect the bellow to the pipeline or equipment.

Gussets / Lugs (part of hinge assembly):

• Provide support for hinge arms and distribute loads.

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:

• Component Common Materials
• Bellows SS 304, SS 316, Inconel, Hastelloy
• Hinges Carbon Steel, SS 304, SS 316
• Pins/Bolts High-strength steel (hardened/tempered)
• End Fittings Same as pipeline (CS or SS)