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Home >> Mercedes Benz >> 2009 >> E550 Base >> Repair and Diagnosis >> Suspension >> Front Suspension >> Suspension -- E550 (211.072) >> Basic Knowledge >> Damping valve, design - GF32.31-P-4300-01B

Damping valve, design - GF32.31-P-4300-01B

Fig 1: Identifying Damping Valve Design
G07506475Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The damping valve (Y51, Y52, Y53, Y54) consists of a casing and 2-piston reed valve packs (p). Located above are the spring-loaded solenoid valve pistons and the solenoids. The valve pistons and solenoids form the solenoid valve units (y1, y2).

If the solenoid valve coils (y1, y2) are not actuated, the spring-loaded solenoid valve pistons (y1, y2) keep the holes directly below them closed. Oil is displaced via the reed valve packs (p) and the oil duct located diagonally opposite in the casing.

If the solenoid valve coil (y1) is actuated, for example, the solenoid valve piston (y1) allows the hole to open and the oil can flow over this hole. Only a small amount of oil is displaced via the piston reed valve pack (p). The damping force levels are achieved by means of the differently positioned reed valve packs and controlling the solenoid valves.