Expansion Joint / Expansion Joints

Primarily used in straight pipeline runs where pure axial movement occurs and external protection is required.

Ideal for underground or exposed outdoor piping networks conveying steam, hot water, exhaust gases, or processing fluids.

Highly recommended for applications where the bellows could be subject to external impact, mechanical damage, or heavy environmental debris.

Bellows Material: Stainless Steel SUS316 (Offers high flexibility and superior corrosion and pitting resistance).

Components Material: Available in Mild Steel, SUS304, or SUS316.

Ending Type: Fixed Flanges (For rigid, leak-proof bolted connections to mating flanges).

Outer Shell: Available in Mild Steel or SUS304 (Encloses the flexible bellows entirely).

Inner Sleeve (Liner): SUS304 or SUS316 (Smoothes out fluid flow, prevents media turbulence, and protects the corrugations from high-velocity erosion).

Axial Movement: Yes (Primary function; absorbs compression and elongation along the longitudinal pipeline axis).

Lateral Movement: No (The rigid outer shell construction prevents lateral offset).

Angular Movement: No (The rigid structural configuration eliminates angular rotation or bending).

Heavy-Duty External Protection: The integrated outer shell shields the delicate thin-walled SUS316 bellows from mechanical impact, falling objects, welding splatter, and environmental hazards.

Over-Extension & Squirm Prevention: The outer shell assembly acts as a built-in safety limit, helping to prevent the bellows from over-extending, over-compressing, or buckling under high pressure (squirming).

Insulation Support: The shell provides a solid external surface, making it easy to apply thermal insulation over the expansion joint without compressing or interfering with the movement of the bellows underneath.