Industrial Air Springs

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Air Spring / Air Bellows

Air bellows are the ideal choice for applications requiring short stroke, high thrust single acting actuators.

Manufactured from fabric reinforced synthetic rubber in one, two or three convolutions according to stroke and model. They incorporate no reciprocating metal parts and so provide virtually frictionless thrust compared with conventional pneumatic cylinders.

All models are single acting only. The return stroke is provided in part by the natural spring action of the bellows but more usually by the load itself.

The simplicity of construction provides an extremely long, virtually maintenance-free service life even under arduous conditions.

industrial air springs

Versions

Available in ten bore size, they are supplied completely assembled. Bore 70 up to 150 mm Air Bellows have aluminium end caps and support rings.

Operation

Due to their flexible construction the mounting of Air Bellows is less critical than with conventional pneumatic cylinders, which normally require rigid fixing and guidance and provide only one axis within a limit of 15° between faces. Additionally the axial location of the end plates may be off set by up to 10 mm.

When pressurised Air Bellows will follow the line of leasedresistance. Accordingly care must be taken with the mounting geometry in angled applications.

When depressurised Air Bellows will fit in to surprisingly small spaces, especially useful for clamping or moving awkwardly shaped or very heavy loads.

In operation it is recommended that the unit is not allowed to "bottom out" or achieve its maximum height. Various mechanical devices may be employed to achieve this.

Compact Air Bellows

  • Frictionless operation
  • No maintenance or lubrication
  • Ideal for short stroke, high-force applications
  • High isolation level for vibrating machines
  • Very easy to install – no alignment problems
  • Bellows fit into small, narrow gaps
industrial air springs

Technical Data

Medium: Compressed air, non-lubricated

Operation: Single acting

Operating Pressure: 8 bar maximum

Operating Temperature :
-40°C to + 70°C (Standard)

Nominal Diameters:
Ø 4½, 6, 8, 10, 12, 15 inches-4½", 6", 8", 10", 12", 15"

Stroke Lengths: From 20 to 315 mm max., depending on diameters and number of convolutions

Materials:

End plates:
Aluminium / Zinc-chromated steel Ø 2¾, 3½, 4½, 6, 8, 10, 12 inches
Zinc-chromated steel 6, 8, 9¼, 10, 12, 15 & others

Central ring: Aluminium or zinc-chromated steel

Rubber part:
Fabric reinforced NR, SBR, BR-compound rubber

Important Intructions:

The design of these Air Bellows allows an operation at an angle of 5° to 25°. The top and bottom plate can be out of alignment, depending on the height of the Air Bellow and the number of convolutions. To avoid damage mechanical stops at both end positions have to be used. To return Air Bellows to their minimum height an external return force must be used. The thrust depends directly on the height of the Air Bellow: When height increases – the thrust decreases. As the outside diameter varies in operation there must be enough clearance around the Air Bellow.

industrial air springs

Mounting Dimensions

Ø mm Type H min mm H static mm H max mm Max stroke mm ØE static mm ØE max mm ØA mm ØB mm F ØM mm Ø Port size Max. pressure bar
70 2¾ x 2 65 90 115 50 78 80 78 36 9 M6 1/4 8
2¾ x 3 80 110 145 65 78 80 78 36 9 M6 1/4 8
110 4½ x 1 45 65 90 45 114 125 110 93 13 M6 3/8 8
4½ x 2 65 100 145 80 114 125 110 93 13 M6 3/8 8
4½ x 3 100 145 200 100 114 125 110 93 13 M6 3/8 8
150 6x1(alu.) 50 80 105 55 153 175 152,5 127 16 M8 1/2 8
6x1(steel) 50 80 105 55 153 175 155 127 M10 1/2 8
6x2(alu.) 78 130 190 112 153 175 152,5 127 16 M8 1/2 8
6x2(steel) 70 130 190 120 153 175 155 127 M10 1/2 8
6x3(alu.) 102 190 275 173 153 175 152,5 127 16 M8 1/2 8
6x3(steel) 95 190 275 180 153 175 155 127 M10 1/2 8
200 8x1 50 90 125 75 204 230 184 155,5 M10 1/2 8
8x2 70 160 250 180 204 230 184 155,5 M10 1/2 8
8x3 100 205 325 225 204 230 184 155,5 M10 1/2 8
250 10x1 50 100 150 100 254 280 210 181 M10 1/2 8
10x2 70 170 270 200 254 280 210 181 M10 1/2 8
10x3 100 250 400 300 254 280 210 181 M10 1/2 8
300 12x1 50 100 150 100 305 330 260 232 M10 1/2 8
12x2 75 170 270 195 305 330 260 232 M10 1/2 8
12x3 100 250 430 330 305 330 260 232 M10 1/2 8
370 14½x1 50 110 165 115 368 395 310 282,5 M10 1/2 8
14½x2 70 180 295 225 368 395 310 282,5 M10 1/2 8
14½x3 100 280 450 350 368 395 310 282,5 M10 1/2 8
410 16x2 75 200 325 250 406 440 310 282,5 M10 1/2 8
16x3 125 300 500 375 406 440 310 282,5 M10 1/2 8
550 21½x2 90 200 390 300 546 580 498,5 470 19 M10 3/4 7
21½x2 (Air Bellows less end caps) 90 200 390 300 546 580 498,5 470 M10 3/4 8
660 26x2 90 200 400 310 660 700 601 470 19 M10 3/4 8

Applications

industrial air springs