Membrane air springs
Series BiAir®-ED
in cast aluminium

Low-frequency (vertical 2.5 Hz) membrane air springs with precisely adjustable damping level for effective vibration isolation. Made of cast aluminium, universally applicable.

  • Load-independent natural frequency
  • Wear-resistant, low-maintenance air damping, easy to adjust from the outside
  • No transmission of structure borne noise
  • max. working height 157 mm
  • Load-independent natural frequency
  • Wear-resistant, low-maintenance air damping, easy to adjust from the outside
  • No transmission of structure borne noise
  • max. working height 157 mm

General product description

Description BiAir®-ED membrane air spring

Series BiAir®-ED in cast aluminium

The BiAir® membrane air spring insulator is made of cast aluminium. The air space
is enclosed by a thin-walled flexible and pressure-resistant rolling membrane. The piston sits on the membrane and is pressed into place by the air volume.
This design allows for highly effective vibration isolation. In order to simultaneously achieve the greatest possible damping effect, the interior of the air spring is divided into
two air chambers connected by an air hose (load and damping volume). An adjustable throttle valve is used to set the flow cross section to the desired damping effect from the outside. The friction in the air flow generated by the throttle valve can create a damping effect of up to 15 %.
Damage to the rolling membrane due to overpressure is virtually impossible through the use of additional safety valves or a mechanical piston stroke limit.

Schematic representation of the elements of a Bilz BiAir membrane air spring

Membrane air spring for effective vibration insulation

TECHNIcal data and variants

General information regarding selection and application of our BiAir® ED membrane air springs
  • The maximum permissible movement amplitude in the horizontal plane is between approximately 1 to 2 mm depending on the size of the air spring.
  • Please select the load at an air pressure of 4 bar when selecting the air spring size.
  • Permissible temperature range: -20 °C to +80 °C
  • In addition to the standard solutions listed here we also offer numerous air springs with a larger stroke and lower natural frequency.
  • Powder-coated in RAL similar to 7037 dusty grey
    The powder coated air springs are also available in other RAL colours on request.
Technical Drawing legend for dimensions Bilz air spring BiAir ED

Legend of dimensions BiAir ED

Variant selection BiAir®-ED in cast aluminium
Type
Item no.
Natural frequency vertical/horizontal Hz
Ø A mm
B mm
Ø C mm
Working height H BiAir-ED mm
+/- Travel mm
max. load N / 4 bar
max. load N / 6 bar
Type
0,5
Item no.
50-0012
Natural frequency vertical/horizontal Hz
2,5/2,8
Ø A mm
120
B mm
216
Ø C mm
129
Working height H BiAir-ED mm
157
+/- Travel mm
+/- 2,5
max. load N / 4 bar
2.670
max. load N / 6 bar
4.000
Type
1
Item no.
50-0026
Natural frequency vertical/horizontal Hz
2,5/2,8
Ø A mm
172
B mm
288
Ø C mm
200
Working height H BiAir-ED mm
157
+/- Travel mm
+/- 2,5
max. load N / 4 bar
6.330
max. load N / 6 bar
9.500
Type
1,5
Item no.
50-0191
Natural frequency vertical/horizontal Hz
2,5/2,8
Ø A mm
212
B mm
305
Ø C mm
230
Working height H BiAir-ED mm
157
+/- Travel mm
+/- 3,5
max. load N / 4 bar
10.170
max. load N / 6 bar
15.260
Type
2
Item no.
50-0188
Natural frequency vertical/horizontal Hz
2,5/2,8
Ø A mm
226
B mm
335
Ø C mm
260
Working height H BiAir-ED mm
157
+/- Travel mm
+/- 2,5
max. load N / 4 bar
14.200
max. load N / 6 bar
21.300
Type
2,5
Item no.
50-0036
Natural frequency vertical/horizontal Hz
2,5/2,8
Ø A mm
271
B mm
378
Ø C mm
300
Working height H BiAir-ED mm
157
+/- Travel mm
+/- 3,0
max. load N / 4 bar
19.670
max. load N / 6 bar
29.500
Type
3
Item no.
50-0055
Natural frequency vertical/horizontal Hz
2,5/2,8
Ø A mm
348
B mm
467
Ø C mm
382
Working height H BiAir-ED mm
157
+/- Travel mm
+/- 2,5
max. load N / 4 bar
34.130
max. load N / 6 bar
51.200
Type
4
Item no.
50-0064
Natural frequency vertical/horizontal Hz
2,5/2,8
Ø A mm
490
B mm
605
Ø C mm
530
Working height H BiAir-ED mm
157
+/- Travel mm
+/- 2,75
max. load N / 4 bar
65.730
max. load N / 6 bar
98.600
Type
5*
Item no.
50-0072
Natural frequency vertical/horizontal Hz
2,5/2,8
Ø A mm
747
B mm
875
Ø C mm
798
Working height H BiAir-ED mm
157
+/- Travel mm
+/- 3,5
max. load N / 4 bar
155.730
max. load N / 6 bar
233.600
Type
*unpainted
Item no.
Natural frequency vertical/horizontal Hz
Ø A mm
B mm
Ø C mm
Working height H BiAir-ED mm
+/- Travel mm
max. load N / 4 bar
max. load N / 6 bar

*max. load N at an air pressure of 4/6 bar

Accessories
BiAir®-ED in cast aluminium

BiAir®-ED mechanical pneumatic level control MPN-LCV

Mechanical pneumatic level control MPN-LCV

The mechanical pneumatic level control MPN-LCV with our robust LCV proportional valves is a simple but effective solution to prevent tilting as a result of load changes. The target level is adjusted by turning the knurled adjustment ring and is maintained with an accuracy of ± 1/10 mm.

BiAir®-ED mechanical pneumatic level control MPN-PVM

Mechanical pneumatic level control MPN-PVM

The mechanical pneumatic level control MPN-PVM with our robust, chromed PVM proportional valves is a simple but effective solution to prevent tilting as a result of load changes. The target level is adjusted by turning the knurled adjustment ring and is maintained with an accuracy of ± 1/100 mm.

BiAir®-ED Electronic Pneumatic Position Control EPPC™

Electronic Pneumatic Position Control EPPC™

EPPC™ real-time level control for efficient vibration insulation of vibration sensitive, highly dynamic machines and strict requirements on positional accuracy and setting time.

Extremely robust galvanised proportional valve. The reset accuracy is ± 1/10 mm,

Solutions

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