METALLIC BELLOWS
Elastic metallic bellows are bending elements that can overtake axial, lateral or angular distortions through the lens of "U" profile. The axial movement occurs when the bellows compress or stretch themselves keeping the axis undistorted. Lateral movement occurs when at least one of the connecting pieces of the bellows moves parallel with the other on horizontal or vertical direction. Angular movement occurs when one of the connecting pieces of the bellows is fix and the other one moves and draws an arc of circle; the bellows were in the beginning with their axis undistorted. Elastic metallic bellows can be used for making dilatation compensating devices that can be mounted on pipes and heat exchangers for overtaking thermal dilatations and vibration damping.
Bellows are divided into three groups according to destination:
- tightening bellows
- bellows for safety valves
- compensating devices
Used materials: W1.4541; W1.4301; W1.4571; W1.4306; W1.4404.
The main technical characteristics of the tightening bellows are shown in the following table:
|
ND [mm] |
Di [mm] |
De [mm] |
D1 [mm] |
p [mm] |
∆p* [mm] |
b [mm] |
L [mm] |
n** max. |
Pmax *** [bar] |
|
|
one layer |
two layers |
|||||||||
|
15 |
13.0 |
20.0 |
- |
2.25 |
± 0.18 |
- |
- |
31 |
6 |
- |
|
20 |
18.4 |
27.0 |
- |
2.7 |
± 0.3 |
- |
- |
28 |
6 |
- |
|
25 |
26.4 |
38.0 |
- |
3.5 |
± 0.55 |
- |
- |
26 |
6 |
10 |
|
32 |
32.4 |
45.0 |
- |
4.8 |
± 0.67 |
- |
- |
25 |
6 |
10 |
|
40 |
40.4 |
53.0 |
- |
5.1 |
± 0.67 |
- |
- |
25 |
6 |
10 |
|
50 |
48.0 |
60.0 |
- |
5.4 |
± 0.8 |
- |
- |
22 |
6 |
10 |
|
55 |
55.0 |
76.0 |
- |
5.6 |
± 0.9 |
- |
- |
25 |
6 |
10 |
|
65 |
65.0 |
89.0 |
- |
6.0 |
± 1.0 |
- |
- |
22 |
6 |
10 |
|
80 |
80.0 |
100.0 |
- |
6.0 |
± 1.2 |
- |
- |
32 |
6 |
10 |
|
100 |
91.0 |
110.0 |
- |
6.6 |
± 1.4 |
- |
- |
37 |
6 |
10 |
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