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This axial expansion joint features direct welding at both ends and stainless steel corrugated pipes. It boasts zero leakage, high pressure and high temperature resistance, and a long service life, making it the preferred choice for thermal/steam/chemical/direct-buried pipelines.
Thermal expansion and contraction of the pipeline generates axial thrust → bellows expands and deforms → absorbs axial displacement (±20–±200mm); the welded connection eliminates gaskets, resulting in zero leakage, while simultaneously absorbing vibration and protecting the pipeline network.
Absolute Sealing: Fully welded, gasket-free, zero leakage.
Higher Pressure Resistance: PN10–PN40 (maximum 6.4MPa), temperature resistance -40℃～450℃, suitable for steam/hot oil.
Longer Service Life: No vulnerable parts, fatigue life ≥1000 cycles, matching the pipeline's lifespan.
Lower Cost: No flanges/bolts/gaskets required, reducing costs by 20%–30%.
Direct Burial Compatibility: After corrosion protection at the welded joint, it can be directly buried, resisting settlement and providing waterproofing.
1. Urban Heating/Steam Pipeline Networks: Long-distance straight pipe sections, overhead/underground/direct burial.
2. Power Plants/Petrochemical/Metallurgical: High-temperature and high-pressure steam/hot oil pipelines, boiler outlets.
3. Chemical/Pharmaceutical: Pipelines for highly corrosive, toxic, flammable, and explosive media.
4.Municipal Water Supply and Drainage: Large-diameter, high-pressure, direct-buried pipelines.
1. Welding Requirements: The end pipe must be fully welded to the main pipe, free of porosity and cracks, and the weld joint must be corrosion-resistant.
2. Support Setup: Fixed supports + guide supports should be installed at both ends to balance the internal pressure thrust.
3. Tie Rod Treatment: Remove the transport tie rods after installation/pressure testing; they must not bear any load.
4. Flow Direction: The guide tube should face the direction of medium flow; it can be installed horizontally or vertically.
| PRODUCT SPECIFICATIONS | ||||||
| DN | Wave number | Pressure rating(MPa) | Length | |||
| 0.6 | 1.0 | 1.6 | Flange（mm） | take over (mm) | ||
| Axial compensation(mm), Rigidity N/mm | ||||||
| 50 | 16 | 46/26 | 41/35 | 36/35 | 204/342 | 347/372 |
| 65 | 8 | 30/35 | 26/44 | 22/55 | 215/294 | 300/322 |
| 65 | 12 | 38/22 | 38/32 | 34/40 | 260/334 | 340/362 |
| 80 | 8 | 36/26 | 34/33 | 28/41 | 240/338 | 344/366 |
| 80 | 10 | 49/17 | 49/21 | 43/26 | 270/368 | 374/390 |
| 100 | 6 | 45/60 | 40/75 | 35/93 | 235/317 | 323/345 |
| 100 | 10 | 74/32 | 64/40 | 57/50 | 305/381 | 387/409 |
| 125 | 5 | 42/47 | 38/59 | 34/74 | 282/314 | 316/342 |
| 125 | 9 | 77/29 | 66/36 | 58/45 | 382/386 | 388/414 |
| 150 | 5 | 44/50 | 40/62 | 34/78 | 282/339 | 338/367 |
| 150 | 8 | 71/43 | 64/51 | 54/59 | 356/399 | 402/427 |
| 200 | 4 | 46/55 | 42/68 | 38/78 | 280/348 | 348/372 |
| 200 | 6 | 65/44 | 59/52 | 53/58 | 340/402 | 402/426 |
| 250 | 4 | 65/34 | 59/42 | 52/45 | 315/379 | 415/379 |
| 250 | 6 | 97/21 | 87/35 | 79/39 | 393/459 | 493/399 |
| 300 | 4 | 65/55 | 59/59 | 52/65 | 366/427 | 466/467 |
| 300 | 6 | 97/35 | 87/37 | 79/41 | 464/525 | 564/565 |
| 350 | 4 | 65/62 | 59/67 | 52/74 | 397/452 | 497/492 |
| 350 | 6 | 97/41 | 87/44 | 79/48 | 509/564 | 609/604 |
| 400 | 4 | 65/58 | 59/62 | 52/68 | 412/478 | 512/518 |
| 450 | 4 | 97/35 | 87/37 | 79/41 | 403/498 | 503/523 |
| 450 | 6 | 145/22 | 131/23 | 118/25 | 503/658 | 603/648 |
| 500 | 4 | 97/64 | 87/68 | 79/75 | 431/523 | 531/544 |
| 500 | 6 | 145/37 | 131/39 | 118/43 | 531/665 | 631/742 |
| 600 | 4 | 97/80 | 87/85 | 79/94 | 478/548 | 578/588 |
| 600 | 6 | 145/45 | 131/49 | 118/53 | 658/679 | 758/781 |
| 700 | 4 | 97/72 | 87/77 | 79/85 | 490 | 590 |
| 700 | 6 | 145/45 | 131/49 | 118/53 | 690 | 790 |
| 800 | 4 | 108/95 | 102/102 | 94/112 | 502 | 602 |
| 800 | 6 | 164/72 | 156/77 | 144/85 | 610 | 710 |
| 900 | 4 | 108/90 | 102/97 | 94/107 | 590 | 698 |
| 900 | 6 | 164/65 | 156/69 | 144/76 | 750 | 850 |
| 1000 | 4 | 108/98 | 102/105 | 94/116 | 590 | 692 |
| 1000 | 6 | 164/65 | 156/71 | 144/81 | 750 | 855 |
| The above data is standard specification, only for reference, if you need to customize please click here to contact us. | ||||||
