IRIE KOKEN CO., LTD.Designers and manufacturers of Vacuum Bellows,
Vacuum Valves, and Vacuum Equipment
These standard products are welded bellows with a conflat flange welded at both ends.
They can be conveniently used under the same conditions as standard specifications (such as internal vacuum and ordinary temperature).
Specify model according to the amount of expansion/contraction (20mm or 30mm).
* For delivery time and price, feel free to ask us using the standard product estimate request form.
How to select standard welded bellows
Precautions for use of welded bellows
CAD drawing download (member registration required)
| Pressure conditions | (Internal) vacuum (External) atmospheric pressure |
|---|---|
| Temperature conditions | Ordinary temperature (baking temp. max. 250°C) |
| Leak rate | 1×10-9 Pa・m3/s or less |
| Bellows material | SUS316L |
| Flange material | SUS304L |
| Conflat flange fixed at both ends or fixation-rotation |
|
| Repetition life | 10,000 repetitions |
| Welded bellows for 20mm expansion/contraction | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Model | Bellows | Flange | Operating range of L |
Axial direction spring constant (N/mm) |
Effective area (cm2) |
Product drawing download |
|||||
| Inner diameter |
Outer diameter |
Length | Outer diameter |
Plate thickness |
PCD | Mounting hole |
|||||
| Bi | Bo | ℓ | D | T | C | - | |||||
| NCE234 | 8 | 22 | 34 | 33.8 | 7.2 | 27.0 | 6-M4 | 50～70 | 1.37 | 1.8 | 2D 3D (K)3D |
| NCE270 | 22 | 36 | 25 | 69.3 | 12.7 | 58.7 | 6-6.8 | 55～75 | 2.65 | 6.6 | 2D 3D (K)3D |
| NCE2114 | 36 | 51 | 21 | 113.5 | 17.5 | 92.2 | 8-8.5 | 60～80 | 3.53 | 14.9 | 2D 3D (K)3D |
| NCE2152 | 79 | 109 | 24 | 151.6 | 19.8 | 130.3 | 16-8.5 | 70～90 | 12.6 | 69.4 | 2D 3D (K)3D |
| NCE2203 | 120 | 150 | 24 | 202.4 | 22.4 | 181.1 | 20-8.5 | 80～100 | 9.41 | 143.1 | 2D 3D (K)3D |
| NCE2253 | 160 | 210 | 26 | 253.2 | 24.6 | 231.9 | 24-8.5 | 90～110 | 15.8 | 268.8 | 2D 3D (K)3D |
（Unit：mm）
* For drawings, right click and click the “Save File” button.
| Welded bellows for 30mm expansion/contraction | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Model | Bellows | Flange | Operating range of L |
Axial direction spring constant (N/mm) |
Effective area (cm2) |
Product drawing download |
|||||
| Inner diameter |
Outer diameter |
Length | Outer diameter |
Plate thickness |
PCD | Mounting hole |
|||||
| Bi | Bo | ℓ | D | T | C | - | |||||
| NCE334 | 8 | 22 | 49 | 33.8 | 7.2 | 27.0 | 6-M4 | 55～85 | 0.98 | 1.8 | 2D 3D (K)3D |
| NCE370 | 22 | 36 | 39 | 69.3 | 12.7 | 58.7 | 6-6.8 | 60～90 | 1.67 | 6.6 | 2D 3D (K)3D |
| NCE3114 | 36 | 51 | 31 | 113.5 | 17.5 | 92.2 | 8-8.5 | 60～90 | 2.35 | 14.9 | 2D 3D (K)3D |
| NCE3152 | 79 | 109 | 32 | 151.6 | 19.8 | 130.3 | 16-8.5 | 75～105 | 9.41 | 69.4 | pdf 3D (K)3D |
| NCE3203 | 120 | 150 | 32 | 202.4 | 22.4 | 181.1 | 20-8.5 | 85～115 | 7.06 | 143.1 | 2D 3D (K)3D |
| NCE3253 | 160 | 210 | 38 | 253.2 | 24.6 | 231.9 | 24-8.5 | 100～130 | 10.6 | 268.8 | 2D 3D (K)3D |
（Unit：mm）
* For drawings, right click and click the “Save File” button.
For one-side rotating flanges, order with the letter “K” suffix attached to the models.
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