Inlet valve for feeding a liquid to an interior space of a chamber system or a sample container, wherein the inlet valve is formed for supplying the liquid by means of a laboratory pipette and comprises a first pipetting axis, and wherein the inlet valve comprises an inlet opening and is formed to automatically reclose said inlet opening, characterized in that the inlet valve comprises: (a) a valve body which can be arranged in the inlet opening and is movable in the direction of the first pipetting axis between a closed position and an open position, comprising: - a blocking element which comprises a sealing surface, - a pressing part which is spaced from the blocking element and can be pressed by a tool (19,19'), and which comprises a liquid passage in the region of the first pipetting axis, - a throat which connects the blocking element and the pressing part to each other, and which comprises at least one open passage region which opens on the one hand into the liquid passage of the pressing part and is formed on the other hand to open into a valve chamber; (b) a valve chamber which surrounds the valve body at least partly in the region of the throat; (c) a spring mechanism (13;30;40) which acts on the one hand on the pressing part or on the blocking element and which is formed on the other hand to act on a wall of the chamber system or on an end element of the sample container; and (d) a sealing element which is connected to an inner wall of the chamber system or to an end element of the sample container, wherein the spring mechanism (13;30;40) is formed in such a way that it presses the sealing surface of the blocking element in the closed position of the valve body against the sealing element, and wherein the valve body of the inlet valve is formed in such a way that it can be brought to the open position by pressing the pressing part against the resistance of the spring mechanism (13;30;40). (a) a valve body which can be arranged in the inlet opening and is movable in the direction of the first pipetting axis between a closed position and an open position, comprising: - a blocking element which comprises a sealing surface, - a pressing part which is spaced from the blocking element and can be pressed by a tool (19,19'), and which comprises a liquid passage in the region of the first pipetting axis, - a throat which connects the blocking element and the pressing part to each other, and which comprises at least one open passage region which opens on the one hand into the liquid passage of the pressing part and is formed on the other hand to open into a valve chamber; - a blocking element which comprises a sealing surface, - a pressing part which is spaced from the blocking element and can be pressed by a tool (19,19'), and which comprises a liquid passage in the region of the first pipetting axis, - a throat which connects the blocking element and the pressing part to each other, and which comprises at least one open passage region which opens on the one hand into the liquid passage of the pressing part and is formed on the other hand to open into a valve chamber; (b) a valve chamber which surrounds the valve body at least partly in the region of the throat; (c) a spring mechanism (13;30;40) which acts on the one hand on the pressing part or on the blocking element and which is formed on the other hand to act on a wall of the chamber system or on an end element of the sample container; and (d) a sealing element which is connected to an inner wall of the chamber system or to an end element of the sample container,