70
5.2 Air suspension
Application
The levelling valve is fi tted as a level control valve for load-
dependent control of the air spring bellows volume in vehicles
with air suspension. This version provides a second ride height
by means of a zero point adjustment.
Operation of the zero point adjustment
In the case of admission fl ow of connection 4, the zero point in
the valve is adjusted by 20° via a tappet. This opens the infl ow
and the body is raised in order to reach the fi nishing position.
The integrated construction of the zero point adjustment has
the following advantages:
- a 2nd ride height on vehicles with lift axles, so that when the
axle is lifted, the wheel does not contact the road surface
when passing over unevenness in the ground, thus preven-
ting increased tyre wear.
- can be matched to various trailer heights, thereby facilitating
operations for the fl eet operator.
Fig. 124
5.2.3 Air suspension valve with zero point adjustment
– dimensions and connections
Di
s
charging
Charging
M8
10
48
66
G
2
G
2
24
57.5
92
G
2
104
50
40
G
2
max. 320
min. 80
Identification mar
k
for
the lever mounting po
s
ition,
lever
s
wivel angle 360°
1. Ride height
2. Ride
height
45°
a
87
51
42
20
20
Ø9
Lin
k
age a
ss
embled
without ten
s
ion (valve axle)
Ø6
Wa
s
her DIN 125B
Tightening tor
q
ue: 22 24 Nm
176
3
4
Operating pressure, dyn.:
pe max. 13 bar
Permitted dyn. bellow pressure:
pe max. 20 bar
Operating temperature:
- 40°C to + 80°C
Operating range (charging - and exhausting): 45°
Nominal diameter/type: 1.3
Side of control:
on the left and on the right
1st ride height dead angle at 7-8 bar:
2°
2nd ride height dead angle at 7-8 bar:
3.5°
Necessary switching pressure:
6.5 bar
Connection designation:
1 =
Energy fl ow
21/22 =
1./2. Energy release
3 =
Venting
4 =
Gate terminal
If the actuator lever is twisted through 180°, the same
function is obtained with a tolerance range of 3.5° for the
fi rst ride height and 4,5° for the second ride height, as for
the setting shown in the drawing.
Technical Data
5
Installation and Operating Instructions
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