BPW ECO Tronic EBS Operating And Installation Instructions page 70

5 Installation and Operating Instructions
5.2 Air suspension
5.2.3 Air suspension valve with zero point adjustment
– dimensions and connections
Identification mark for
the lever mounting position,
lever swivel angle 360°
Charging
1. Ride height
Discharging
10
Fig. 124
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.
70
max. 320
min. 80
104
50
40
G2
3
Linkage assembled
without tension (valve axle)
4
Technical Data
Operating pressure, dyn.:
Permitted dyn. bellow pressure:
Operating temperature:
Operating range (charging - and exhausting): 45°
Nominal diameter/type: 1.3
Side of control:
1st ride height dead angle at 7-8 bar:
2nd ride height dead angle at 7-8 bar:
Necessary switching pressure:
Connection designation:
1 =
21/22 =
3 =
4 =
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.
87
51
42
20 20
Ø6
M8
pe max. 13 bar
pe max. 20 bar
- 40°C to + 80°C
on the left and on the right
2°
3.5°
6.5 bar
Energy fl ow
1./2. Energy release
Venting
Gate terminal