Sample injector, in particular for high-power liquid chromatography

The Invention relates to a device for feeding samples to a separating device and for collecting generated by the separator sample fractions, especially for high performance liquid chromatography, with a first switch valve unit (201) which comprises at least eight Ports (port numbers 1 to 8) and two switch positions, wherein in a first switch position (1-2) in each case precisely two adjacent Ports are interconnected and wherein in a second switching position, (8-1) precisely those adjacent ports are connected together in each case, which are not connected in the first switch position to each other. The apparatus comprises a metering device (4) for supplying a Sample to the switch valve unit (201) which with a suction port (Port number 1) is the first switch valve unit (201) connected, and what with aspirating and dispensing means (6) for the removal a sample of at least one sample receiving vessel (7) and delivering each a fraction of a fraction of several receptacles (12) cooperates with a suction and discharge port (port number 6) of the first switch valve unit (201) is connected. The ports the first switch valve unit (201) are so occupied that in the first switch position (1-2) of the intake port (port number 1) and the first sample reservoir port (port number 2), the Lösungsmittelzuführ port (port number 3) and the separating device transfer port (port number ...