SS304 PTFE Line Stainless Steel Metallic Exhaust Bellows Expansion Joints for Piping
A PTFE-lined bellows expansion joint is a crucial component in piping systems, particularly in industries where highly corrosive or chemically aggressive media are handled. It combines the flexibility of a bellows (often metal or rubber) with the exceptional chemical resistance of Polytetrafluoroethylene (PTFE), also known as Teflon.
What it is:
At its core, a PTFE-lined bellows expansion joint consists of an outer bellows structure (typically made of stainless steel ) with a seamless, formed PTFE liner on the inside. This liner protects the primary bellows material from direct contact with the process fluid.
The bellows itself is designed with convolutions (folds) that allow it to absorb various types of movement in a pipeline, including:
- Axial movement: Expansion and contraction along the pipe's length due to temperature changes.
- Lateral movement: Side-to-side displacement.
- Angular movement: Rotational or bending movements.
- Vibration: Dampening mechanical vibrations from pumps or other equipment.
- Misalignment: Compensating for minor installation inaccuracies.
Technical Parameters
| Nominal Diameter (mm) | Wave number | Pressure level | Effective area of bellows | Maximum outer diameter dimension | length |
| 0.25 | 0.6 | 1 | 1.6 | 2.5 | Flange JZ/F | Nozzle JZ/J |
| Axial compensator,rigidity |
| 32 | 8 | 25/21 | 22/26 | 20/26 | 18/63 | / | 16 | 225 | 160/250 | 264/280 |
| 32 | 16 | 50/11 | 46/14 | 41/14 | 36/32 | / | 16 | 225 | 224/291 | 316/321 |
| 40 | 8 | 25/28 | 22/44 | 20/44 | 18/89 | 15/98 | 23 | 244 | 164/259 | 269/289 |
| 40 | 16 | 50/14 | 46/22 | 41/22 | 36/45 | 31/47 | 23 | 244 | 230/304 | 319/334 |
| 50 | 8 | 25/30 | 22/51 | 20/70 | 18/70 | 15/106 | 37 | 259 | 172/276 | 282/306 |
| 50 | 16 | 50/16 | 46/26 | 41/35 | 36/35 | 31/55 | 37 | 259 | 240/342 | 347/372 |
| 65 | 8 | 33/28 | 30/35 | 26/44 | 22/55 | 15/138 | 55 | 270 | 215/294 | 300/322 |
| 65 | 12 | 42/16 | 38/22 | 38/32 | 34/40 | 31/70 | 55 | 270 | 260/334 | 340/362 |
| 80 | 8 | 40/20 | 36/26 | 34/33 | 28/41 | 19/68 | 81 | 284 | 240/338 | 344/366 |
| 80 | 10 | 53/14 | 49/17 | 49/21 | 43/26 | 29/50 | 81 | 284 | 270/368 | 374/390 |
| 100 | 6 | 45/47 | 45/60 | 40/75 | 35/93 | 25/54 | 121 | 304 | 235/317 | 323/345 |
| 100 | 10 | 76/26 | 74/32 | 64/40 | 57/50 | 38/33 | 121 | 304 | 305/381 | 387/409 |
| 125 | 5 | 48/38 | 42/47 | 38/59 | 34/74 | 29/117 | 180 | 334 | 282/314 | 316/342 |
| 125 | 9 | 85/23 | 77/29 | 66/36 | 66/36 | 49/63 | 180 | 334 | 382/386 | 388/414 |
| 150 | 5 | 49/42 | 44/50 | 40/62 | 34/78 | 29/92 | 257 | 364 | 282/339 | 338/367 |
| 150 | 8 | 79/34 | 71/43 | 64/51 | 54/59 | 50/56 | 257 | 364 | 356/399 | 402/427 |
| 200 | 4 | 52/49 | 46/55 | 42/68 | 38/78 | 29/97 | 479 | 442 | 280/348 | 348/372 |
| 200 | 6 | 73/31 | 65/44 | 59/52 | 53/58 | 46/65 | 479 | 442 | 340/402 | 402/426 |
| 250 | 4 | 72/30 | 65/34 | 59/42 | 52/45 | 34/111 | 769 | 507 | 315/379 | 415/379 |
| 250 | 6 | 108/16 | 97/21 | 87/35 | 79/39 | 48/78 | 769 | 507 | 393/459 | 493/399 |
| 300 | 4 | 72/51 | 65/55 | 59/59 | 52/65 | 47/55 | 1105 | 562 | 366/427 | 466/467 |
| 300 | 6 | 108/32 | 97/35 | 87/37 | 79/41 | 71/47 | 1105 | 562 | 464/525 | 567/595 |
| 350 | 4 | 72/58 | 65/62 | 59/67 | 52/74 | 47/71 | 1307 | 622 | 397/452 | 497/492 |
| 350 | 6 | 108/38 | 97/41 | 87/44 | 97/48 | 71/45 | 1307 | 622 | 509/564 | 409/604 |
| 400 | 4 | 72/54 | 65/58 | 59/62 | 52/68 | 47/81 | 1611 | 700 | 412/478 | 512/518 |
| 400 | 6 | 108/36 | 97/39 | 87/43 | 79/47 | 71/47 | 1611 | 700 | 522/88 | 622/628 |
Advantages of PTFE-Lined Bellows Expansion Joints:
The combination of bellows flexibility and PTFE's properties offers significant advantages:
Exceptional Chemical Resistance: PTFE is highly inert and resistant to almost all industrial chemicals, including strong acids, bases, solvents, and corrosive gases. This makes it ideal for handling aggressive media that would quickly degrade other materials.
Wide Temperature Range: PTFE can withstand a broad range of temperatures, typically from −200∘C to +260 ∘C (−328 ° F to +500 ∘ F), making them suitable for various demanding applications.
PTFE-lined bellows expansion joints are widely used in a variety of industries and applications where chemical resistance, temperature stability, and flexibility are paramount:
Chemical Processing Plants: Handling corrosive acids, alkalis, solvents, and other aggressive chemicals in reactors, heat exchangers, and piping systems.
Pharmaceutical Industry: Maintaining hygienic conditions and preventing contamination when handling sterile or reactive products.
Food and Beverage Industry: Ensuring sanitation and preventing product build-up in processing lines.
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SS304 PTFE Lined Stainless Steel Exhaust Bellows Expansion Joint Images
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