Bellow adopt single layer, double layer or multi-layer U type waves, bellow and cover material is 1Cr18Ni9Ti austenitic stainless, other material is low carbon steel or low alloy steel.
Metal bellows expansion joints (also called compensators) are compensating elements for thermal expansion and relative movement in pipelines, containers and machines. They consist of one or more metal bellows, connectors at both ends, and tie rods that depend on the application. They are differentiated according to the three basic types of movement: axial, angular and lateral expansion joints.
In modern Metal expansion Bellow, It is often produced with a so-called multi-ply design. To increase both flexibility and stability, multiple thin plies of metal are layered to form the bellow walls. There are two basic design types: The multi-ply and the multi-walled bellows structure.
| Order | Specification(two waves) | Nominal diameter | Compensation amount（mm） | Summit diameter（mm） | Length（mm） |
| 1 | 1.2" | DN32 | 60=±30 | 170 | 245 |
| 2 | 1.5" | DN40 | 60=±30 | 190 | 255 |
| 3 | 2" | DN50 | 60=±30 | 300 | 325 |
| 4 | 2.5" | DN65 | 60=±30 | 320 | 336 |
| 5 | 3" | DN 80 | 60=±30 | 360 | 340 |
| 6 | 4" | DN100 | 60=±30 | 400 | 350 |
| 7 | 5" | DN125 | 60=±30 | 433 | 360 |
| 8 | 6" | DN150 | 60=±30 | 477 | 385 |
| 9 | 8" | DN200 | 60=±30 | 527 | 390 |
| 10 | 10" | DN250 | 60=±30 | 579 | 420 |
| 11 | 12" | DN300 | 60=±30 | 635 | 435 |
| 12 | 14" | DN350 | 60=±30 | 635 | 440 |
| 13 | 16" | DN400 | 60=±30 | 760 | 460 |
| 14 | 18" | DN450 | 60=±30 | 810 | 460 |
| 15 | 20" | DN500 | 60=±30 | 860 | 460 |
| 16 | 2" four waves | DN50 | 120=±60 | 300 | 590 |
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