Patent ID: 7059838

Claim:
A control device for a positive displacement pump, comprising: a throttle device configured to connect a pressure space of the pump to an outlet connected to a consumer; and a flow control piston displaceably arranged in a housing bore, the flow control piston including a first end face connected to the pressure space and a second end face configured to delimit a space connected to the outlet, the flow control piston configured to open a connection from the pressure space to an inlet duct of the pump in accordance with a differential pressure acting on the first end face and the second end face; wherein the throttle device is arranged in a pressure output of the pump and includes a control pin, having a control contour configured to cooperate with a throttling bore to define a modifiable passage cross-section, a first one of the control pin and the throttling bore connected to the flow control piston, a second one of the control pin and the throttling bore fixed in relation to the housing; and wherein the throttle device includes an axial displacement region not used for volume flow control having a thickened portion so that a minimal aperture cross-section is arranged in the axial displacement region.