BMW 740iL Reparaturanleitung Seite 29

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29
Level Control Systems
Pneumatic Drain Valve
The Pneumatic Drain Valve is activated pneumatically by pressure from the control valve.
This causes the drain valve to open allowing the pressure supply line to vent to atmosphere.
This design allows for large air volumes to be discharged quickly and eliminates the need
for a solenoid valve with high current consumption.
The 21 bar pressure limiting valve is integrated in the drain valve.
Electric Pressure Relief Valve
The electrically activated pressure relief valve controls normal system pressure. The con-
trol valve performs this function in conjunction with the drain valve.
HIgh Pressure Vent Valve
The High Pressure Vent Valve serves as a comfort valve and is used to release system pres-
sure after the accumulator has closed and the compressor is still running. When the high
pressure vent valve has opened the compressor can be stopped quietly.
Air Drier
In the air drier, the air which is drawn in passes over a water absorptive filter material in the
form of filter nodules which extract moisture from the air. As long as the air contains more
moisture than the filter material, the individual nodules absorb and accumulate the mois-
ture. When the air flows back, it is drier than the filter material, with the result that the air is
re-humidified and the moisture is discharged into the open air. The maximum
water storage capacity of the filter is 30 g.
1. Pneumatic Drain Valve
2. Electric Pilot Control Valve
3. High Pressure Vent Valve
4. Air Drier
5. Compressor
6. Sintered filter
7. To Pressure Accumulator/Valve Unit NW Size of
opening/tubing in mm.
Air Supply Unit
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