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1. The medium flows through the inside of the bellows (internal pressure type), with pressure acting outward.
2. Pipeline thermal expansion → bellows compression; cooling contraction → bellows extension, absorbing axial displacement.
3. Internal pressure generates axial thrust, which must be supported by fixed brackets.
1. Simple structure, low cost, easy installation.
2. High efficiency in compensating axial displacement, also allows minor lateral/angular compensation.
3. Vibration and noise reduction, suitable for high-temperature steam, hot water, gas, etc.
Urban heating networks and heating pipelines (most common).
High-temperature steam pipelines in petrochemical, power, and metallurgical industries.
Axial compensation for straight sections of pipe corridors and overhead pipelines.
Equipment inlets and outlets, absorbing vibration and thermal displacement.
1. Only for straight pipe sections; fixed brackets at both ends, with a guide bracket near the end (first guide distance ≤ 4 times the pipe diameter).
2. Medium flow direction must align with the flow sleeve direction; reverse installation is prohibited.
3. Pre-compression/pre-extension during installation (according to design temperature).
4. Strictly forbid welding spatter from damaging the bellows; do not bear weight or step on it.
| Design temperature 20℃-400℃ Product code: JDZ Model designation: JDZ Bellows type - Connection type Pressure - Nominal diameter - Compensator | |||||||||
| Nominal diameter DN | Wave number | Pressure rating MPa | Corrugated pipe Effective area (cm²) | Maximum outer diameter (mm) | Length L | ||||
| 0.6 | 1.0 | 1.6 | 2.5 | Flange JDZ/F | Takeover of JDZ/J | ||||
| Axial compensation (mm) / Stiffness (N) (mm) | |||||||||
| 32 | 8 | 22/26 | 20/26 | 18/63 | 15/98 | 16 | 225 | 160/250 | 264/280 |
| 16 | 46/14 | 41/14 | 36/32 | 31/47 | 224/291 | 316/321 | |||
| 40 | 8 | 22/44 | 20/44 | 18/89 | 15/106 | 23 | 233 | 164/259 | 269/289 |
| 16 | 46/22 | 41/22 | 36/45 | 31/55 | 230/304 | 319/334 | |||
| 50 | 8 | 22/51 | 20/70 | 18/70 | 15/138 | 37 | 259 | 172/276 | 282/306 |
| 16 | 46/26 | 41/35 | 36/35 | 31/70 | 240/342 | 347/372 | |||
| 65 | 8 | 30/35 | 26/44 | 22/55 | 19/68 | 55 | 270 | 215/294 | 300/322 |
| 12 | 38/22 | 38/32 | 34/40 | 29/50 | 260/334 | 340/362 | |||
| 80 | 8 | 36/26 | 34/33 | 28/41 | 24/54 | 81 | 284 | 240/338 | 344/366 |
| 10 | 49/17 | 49/21 | 43/26 | 38/33 | 270/368 | 374/390 | |||
| 100 | 8 | 45/60 | 40/75 | 35/93 | 29/117 | 121 | 304 | 235/317 | 323/345 |
| 10 | 74/32 | 64/40 | 57/50 | 49/63 | 305/381 | 387/409 | |||
| 125 | 6 | 42/47 | 38/59 | 34/74 | 29/92 | 180 | 334 | 282/314 | 316/342 |
| 8 | 77/29 | 66/36 | 58/45 | 50/56 | 382/386 | 388/414 | |||
| 150 | 6 | 44/50 | 40/62 | 34/78 | 29/97 | 257 | 354 | 282/339 | 338/367 |
| 8 | 71/43 | 64/51 | 54/59 | 46/65 | 356/399 | 402/427 | |||
| 200 | 6 | 46/55 | 42/68 | 38/78 | 34/111 | 479 | 442 | 280/348 | 348/372 |
| 8 | 65/44 | 59/52 | 53/58 | 48/78 | 340/402 | 402/426 | |||
| 250 | 6 | 65/34 | 59/42 | 52/45 | 47/55 | 769 | 507 | 315/379 | 415/379 |
| 8 | 97/21 | 87/35 | 79/39 | 71/47 | 393/459 | 493/399 | |||
| 300 | 6 | 65/55 | 59/59 | 52/65 | 47/71 | 1105 | 562 | 366/427 | 466/476 |
| 8 | 97/35 | 87/37 | 79/41 | 71/45 | 464/525 | 564/565 | |||
| 350 | 6 | 65/62 | 59/67 | 52/74 | 47/81 | 1307 | 622 | 397/452 | 497/492 |
| 8 | 97/41 | 87/44 | 79/48 | 71/47 | 509/564 | 609/604 | |||
| 400 | 6 | 65/58 | 59/62 | 52/68 | 47/75 | 1611 | 700 | 412/478 | 512/518 |
| 8 | 97/39 | 87/43 | 79/47 | 71/52 | 522/588 | 622/628 | |||
| 450 | 6 | 97/35 | 87/37 | 79/41 | 71/45 | 1972 | 760 | 403/498 | 503/523 |
| 8 | 145/22 | 131/23 | 118/25 | 106/28 | 503/658 | 603/648 | |||
| 500 | 6 | 97/64 | 87/68 | 79/75 | 71/82 | 2445 | 835 | 431/523 | 531/554 |
| 8 | 145/37 | 131/39 | 118/43 | 106/48 | 531/665 | 631/742 | |||
| 600 | 6 | 97/80 | 87/85 | 79/94 | 71/103 | 3534 | 980 | 478/548 | 578/588 |
| 8 | 145/45 | 131/49 | 118/53 | 106/60 | 658/679 | 758/781 | |||
| 700 | 4 | 97/72 | 87/77 | 79/85 | 71/95 | 4717 | 1110 | 490 | 590 |
| 6 | 145/45 | 131/49 | 118/53 | 106/60 | 690 | 790 | |||
| 800 | 4 | 108/95 | 102/102 | 94/112 | 82/123 | 5822 | 1265 | 502 | 602 |
| 6 | 164/72 | 156/77 | 144/85 | 125/93 | 610 | 710 | |||
| 900 | 4 | 108/90 | 102/97 | 94/107 | 82/117 | 7620 | 1186 | 698 | |
| 6 | 164/65 | 156/69 | 144/76 | 125/84 | 850 | ||||
| 1000 | 4 | 108/98 | 102/105 | 94/116 | 9043 | 1286 | 692 | ||
| 6 | 164/65 | 156/71 | 144/81 | 855 | |||||
