Rubber air spring for highly effective isolation
of machinery and subassemblies against shock and
oscillation. The bell shaped component is made of
high grade elastomer. The construction allows a
highly effective isolation without the disadvantage
of excessive horizontal deflection. It is impossible
for the element to break down as a result of
overloading or a sudden drop in pressure. To reduce
vertical dampening, the component is available with
additional attenuation, see FAEBI®-HD below. The
base plate is equipped with an anti-slip pad so
there is no need to anchor the machine to the floor.
Note: For outdoor use (e.g. isolation of a roof top
air condition unit) the FAEBI® can be supplied in a
stainless steel and EPDM elastomer version.
BILZ Level Controller Systems
Level control is an important part of an
optimally functioning air spring system. Level
control can be utilized whenever load changes occur
on rubber air spring isolated machines, causing an
unwanted one-sided spring deflection of the air
elements, e.g. tilting of the machine.
Isolation against Shock and Oscillation
Depending upon the static load, the natural
frequency of the elements varies between 2,5 – 6 Hz
in the vertical direction. The ratio between
vertical and horizontal natural frequency is 1– 1,2.
Maximum spring deflection during impulse load is
approximately 15 mm.
Range of Application
Excellently suited for active isolation of high
speed power presses, forging hammers as well as
other machines and equipment with high dynamic
forces. Passive isolation of measuring and testing
machines as well as high precision machine tools.
Systems can also be supplied with an option of
electronic or mechanical level control!
The components are screwed on to the machine by
means of predrilled holes. It is not necessary to
anchor the machine to the floor. The machine is
placed on deflated elements which are then inflated
to a maximum of 5–6 bar via a standard valve. To
level the machine, air can either be released or
added. The maximum height adjustment available is 10
Control of Air Pressure
Upon request, FAEBI® elements can be equipped with
an air pressure monitor. This monitor will indicate
if air pressure goes below the desired value.
FAEBI® - Mechanical-Pneumatic control valves
The mechanical-pneumatic control valves are a simple
yet effective solution. The level is constantly
scanned by a plunger. The plunger position in
transmitted to a slide valve. Depending on the slide
valve position, pressure is either applied to the
air spring or vented from the inside of the air
spring. The level can be maintained at an accuracy ±
Principally three control valves are used. The
incoming air supply is conditioned with a pressure
regulator to limit system pressure to a maximum of 6
bar & with a water trap to remove vapor and an air
filter to remove dust andany foreign bodies from the
Combined Rubber Air Spring Isolator FAEBI®-HD
with adjustable dampening
Rubber air spring isolator FAEBI®-HD is made of a
combination of high grade elastomer & metal with an
enlarged sidewall. In order to obtain as high a
dampening effect as possible, the air space is split
into two chambers (load / dampening volume) linked
by an air tube. By the adjustable valve the
dampening can be changed easily from outside. Due to
the friction caused by the air stream passing
through the bypass valve, it is possible to adapt
the dampening to each application.
Because of the very high dampening, the resonance
amplitude is much smaller and therefore you are able
to achieve less machine movement. (see graph 1a + 1b
on page 22 of the catalog) In addition, energy
created by the machine is dissipated by the air
spring, which provides improved machine performance
and prolonged machine life.
In contrast to viscous dampers, the air dampening is
absolutely wear resistant and free of maintenance.
Furthermore it is possible to change the dampening