TYPE GRB

CFM Air Springs type GRB have a standard natural frequency between 1.3 Hz and 1.7 Hz, depending on size and operating pressure. At an operating pressure of 8 bar, a maximum load capacity of 329 kN per air spring can be achieved. Through special measures, this air spring type can be modified to have a vertical natural frequency of 0.6 Hz.

The type GRB air spring is primarily used as an isolation element in combination with concrete foundations and other seismic masses. It is specifically suited for high-dynamic applications. This low-frequency air spring is also used for high-quality passive vibration isolation systems. The body components are made from tight cast aluminium in the standard version. Special versions made from steel or seawater-resistant stainless steel are also available.

GRB-MD Air Springs feature an integrated damper plate to increase the damping up to 10 % at high oscillation amplitudes.

GRB-MD Air Springs feature an integrated viscous damper to increase the damping up to 25 % at high oscillation amplitudes.

GRB-ZV Air Springs feature an integrated or external additional volume and are ideally suited for constructions under seismic masses in high-dynamic applications. Depending on size and operating pressure, the natural frequency can be switched to 0.85 Hz. GRB air springs with integrated additional volume are much larger in height and therefore, strip footings as support constructions are not necessary. This saves concrete work, simplifies formwork for T-shaped foundation bodies, and thus significantly reduces construction costs.

Air Spring GRB

Offered Sizes

*The natural frequency of model VD slightly varies from the standard value. Please contact us for detailed specifications.

ModelOperating Pressure  [bar]Load Capacity [kN]Vertical Natural Frequency (dyn.) [Hz]
GRB 780     /-MD /-VD*
GRB 780     /-MD /-VD*
GRB 780     /-MD /-VD*
4
6
8
52
78
104
1.7
1.6
1.5
GRB 1240     /-MD /VD*
GRB 1240     /-MD /VD*
GRB 1240     /-MD /VD*
4
6
8
83
124
165
1.5
1.4
1.3
GRB 1820     /MD /VD*
GRB 1820     /MD /VD*
GRB 1820     /MD /VD*
4
6
8
122
184
244
1.4
1.3
1.3
GRB 2480     /MD /VD*
GRB 2480     /MD /VD*
GRB 2480     /MD /VD*
4
6
8
165
248
329
1.5
1.4
1.4
GRB 2480-1200 ZV     /AV
GRB 2480-1200 ZV     /AV
GRB 2480-1200 ZV     /AV
4
6
8
165
248
329
0.85
0.80
0.75
GRB 2480-840
GRB 2480-840
GRB 2480-840
4
6
8
165
248
329
1.05
1.00
0.95