Bellows are supplied alongwith required bellow flanges and nut-bolts. Distance-locking bolts are provided to avoid excessive compression or contraction of the bellow. Gaskets are not required where bellows are used. For drilling details, refer “Bellow flanges”.
These can withstand a temperature of 200 °C under normal atmospheric conditions.
| CAT.REF. | DN | D | D1 | D2 | L |
|---|---|---|---|---|---|
| FBN0.5 | 12 | 50 | 24 | 16 | 50 |
| FBN0.7 | 15 | 64 | 28 | 17 | 55 |
| FBN1* | 25 | 95 | 41 | 31 | 65 |
| FBN1.5* | 40 | 105 | 56 | 43 | 65 |
| FBN2* | 50 | 120 | 69 | 55 | 65 |
| FBN3* | 80 | 155 | 98 | 82 | 65 |
| FBN4* | 100 | 200 | 132 | 111 | 65 |
| FBN6* | 150 | 275 | 184 | 162 | 65 |
| FBN9* | 225 | 350 | 258 | 230 | 65 |
| FBN12 | 300 | 420 | 340 | 308 | 65 |
For pipelines of 80DNand above operating under vacuum, the bellows are provided with an internal sleeve which supports the convolutions without affecting the flexibility of the bellow. o These bellows can withstand a temperature of 200 C under full vacuum.
For size upto 50DN, line bellows can be used for these applications.
| CAT.REF. | DN | D | D1 | D2 | L | L1 | T |
|---|---|---|---|---|---|---|---|
| VB3 | 80 | 155 | 98 | 82 | 70 | 5 | 3.0 |
| VB4 | 100 | 200 | 132 | 111 | 70 | 5 | 3.5 |
| VB6 | 150 | 275 | 184 | 162 | 70 | 5 | 4.0 |
| VB9 | 225 | 350 | 253 | 230 | 70 | 5 | 5.0 |
| VB12 | 300 | 420 | 338 | 308 | 70 | 5 | 5.0 |