Level Control 2
The Nivomat is a self-pumping system to reach the vehicle height (level) as quickly as possible after loading. The system works without any electronics and can be
mounted instead of the dampers on the rear axle.
It is a two-tube damper with pressurized, enlarged compensating chamber and a laterally mounted oil
reservoir. There, a movable separating piston seals the gas space from the hydraulic part. The piston rod of
the damper is hollow-bored and provided with an additional so-called rod pump.
If the rear of the car is lowered after loading, oil from the oil reservoir is pumped into the working and
compensating chamber by means of two no-return valves. The pressure drops in the oil reservoir and rises in
the other two chambers. As a result, the vehicle tail is raised.
A helical groove is ground into the rod piston within the piston rod (helical groove). When the normal vehicle
height is reached, the two check valves are bypassed, thus connecting the pump chamber to the working and
compensating chamber, thus stopping another pressure increase.
The increased pressure in the working and compensating chamber ensures a high rear end during
unloading, but this is quickly corrected by the helical groove acting as a mechanical/hydraulic height sensor.
11/16
| Pressure in working/
compensating chamber | Pressure in
oil reservoir |
| Rear loaded | hoch | low |
| Rear unloaded | low | slightly increased |
| 
