Patent ID: 6966341

Claim:
A compressed air control apparatus for compressed air systems of motor vehicles, comprising: a pressure controller being designed and arranged to control the pressure in said compressed air control apparatus; an air dryer being designed and arranged to dry the compressed air flowing through said compressed air control apparatus; and a multi circuit protection valve being designed and arranged to supply a plurality of circuits with compressed air, said multi circuit protection valve including: at least one solenoid valve including a deaerating connection leading to the atmosphere, and a plurality of overflow valves, each of said overflow valves being associated with one of said circuits, said overflow valve including a valve body, a flow chamber, a rear chamber, a first effective surface, a second effective surface, a third effective surface and a spring being located in said rear chamber, said valve body being designed and arranged to separate said flow chamber from said rear chamber, said valve body having a first side facing said flow chamber and a second side facing away from said flow chamber, said overflow valve being designed and arranged in a way that its opening pressure is greater than its closing pressure to allow for limited backflow, said third effective surface being designed and arranged to be directly impinged with pressure by said solenoid valve, said third effective surface being arranged at one of said first side to be directly impinged with pressure and said second side to be indirectly impinged with pressure.