Patent ID: 7467515

Claim:
A hydrostatic drive system, comprising: a consumer located in an open circuit; at least one pressure limiting device which can be actuated in a braking phase for generation of a braking pressure on a discharge side of the consumer from a minimum response pressure in a direction of an increase of the response pressure; and a feeder device to provide a feed of pressure fluid into an admission side of the consumer, wherein the pressure limiting device and the feeder device are integrated into a valve unit, wherein for the increase of the response pressure, the valve unit is in functional communication with a piston device that acts in the direction of an increase of the response pressure of the pressure limiting device, and wherein the piston device has a first control pressure chamber that actuates the valve unit in the direction of a reduction of the response pressure and is pressurized by the consumer pressure, and the piston device has a second control pressure chamber that actuates the valve unit in the direction of an increase of the response pressure and is pressurized by the consumer pressure by a flow control device.