Valve unit and motor vehicle

A motor vehicle having at least one valve unit comprising at least one valve housing, said valve housing including a valve inlet, a valve outlet and a chamber formed therebetween, and at least one valve body disposed within the chamber in the valve housing and having an inflection point, which when viewed from the valve inlet in the direction of the valve outlet includes a cross-section that increases up to the inflection point and decreases past the inflection point, and which is guided from a closed position in which the valve body seals the valve inlet to a final opened position in which the valve body abuts a stop element fixed in the valve housing, releasing the valve inlet, wherein an inflow section is formed in the chamber between the valve inlet and the inflection point of the valve body and an outflow section is formed in the chamber between the inflection point of the valve body and the valve outlet when the valve body is in the final opened position so that a cross-sectional dimension of the chamber gradually reduces in size from the inflow section past the inflection point to the outflow section to provide a lower flow rate, a lower dynamic pressure and a higher static pressure of a fluid flowing through the valve in the inflow section than the outflow section, where the inflow section includes an expanding cross-section in the area of the valve inlet, which expands in the direction of the valve outlet to a maximum cross-section and, once past the maximum cross-section, narrows continually and transitions seamlessly into the outflow section, and where the maximum cross-section is located upstream of the valve body when in the final opened position.