AIRmatic central reservoir charge valve, location/task/design/function - GF32.31-P-4501A

MODEL 211 with CODE (489a) Airmatic (semi-active air suspension) 

Fig 1: Locating AIRmatic Central Reservoir Charge Valve

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

AIRmatic central reservoir charge valve, location	In left front wheelhousing
AIRmatic central reservoir charge valve, task	Serves to fill the central reservoir.
AIRmatic central reservoir charge valve, design	The AIRmatic pressure sensor is attached to the valve block of the charge valve.
AIRmatic central reservoir charge valve, function	The charge valve is closed when de-energized and is opened only in order the fill the central reservoir.