Valve device for adjusting a coolant flow in a cooling system for an internal combustion engine of a motor vehicle, - having a housing delimiting a housing interior in which at least one first, one second, one third and one fourth fluid port (4a-4d) are respectively provided for a fluid to flow through, - having a valve body arranged in the housing interior which has a shaft which is rotationally adjustable relative to the housing along a direction of rotation, characterised in that - a first and a second valve element (9a, 9b) are arranged on the shaft respectively in a torque-proof manner and at a distance to each other which are formed in such a way that each of the four fluid ports (4a-4d) is respectively unlocked at least partially for the fluid to flow through or is closed by one of the two valve bodies (9a, 9b) as a function of the adjusted rotational position of the shaft, - the first fluid port is configured as the first fluid inlet and the second fluid port is configured as the second fluid inlet, respectively for introducing the fluid into the housing interior, - wherein the third fluid port is configured as the first fluid outlet and the fourth fluid port is configured as the second fluid outlet, respectively for discharging the fluid out of the housing interior, - in a predetermined first rotational position, all four fluid ports (4a-4d) are respectively closed either by the first or second valve body (9a, 9b), - in a predetermined second rotational position, the second fluid inlet is closed and the first fluid inlet is unlocked for the fluid to flow through and in that the first fluid outlet is closed and the second fluid outlet is unlocked for the fluid to flow through, - in a predetermined third rotational position, the two fluid inlets (5a, 5b) are unlocked for the fluid to flow through and at least one of the two fluid outlets (6a, 6b) is unlocked at least partially for the fluid to flow through, - in a predetermined fourth rotational position, the two fluid inlets (5a, 5b) and the first fluid outlet are unlocked for the fluid to flow through and the second fluid outlet is closed. - having a housing delimiting a housing interior in which at least one first, one second, one third and one fourth fluid port (4a-4d) are respectively provided for a fluid to flow through, - having a valve body arranged in the housing interior which has a shaft which is rotationally adjustable relative to the housing along a direction of rotation, - a first and a second valve element (9a, 9b) are arranged on the shaft respectively in a torque-proof manner and at a distance to each other which are formed in such a way that each of the four fluid ports (4a-4d) is respectively unlocked at least partially for the fluid to flow through or is closed by one of the two valve bodies (9a, 9b) as a function of the adjusted rotational position of the shaft, - the first fluid port is configured as the first fluid inlet and the second fluid port is configured as the second fluid inlet, respectively for introducing the fluid into the housing interior, - wherein the third fluid port is configured as the first fluid outlet and the fourth fluid port is configured as the second fluid outlet, respectively for discharging the fluid out of the housing interior, - in a predetermined first rotational position, all four fluid ports (4a-4d) are respectively closed either by the first or second valve body (9a, 9b), - in a predetermined second rotational position, the second fluid inlet is closed and the first fluid inlet is unlocked for the fluid to flow through and in that the first fluid outlet is closed and the second fluid outlet is unlocked for the fluid to flow through, - in a predetermined third rotational position, the two fluid inlets (5a, 5b) are unlocked for the fluid to flow through and at least one of the two fluid outlets (6a, 6b) is unlocked at least partially for the fluid to flow through, - in a predetermined fourth rotational position, the two fluid inlets (5a, 5b) and the first fluid outlet are unlocked for the fluid to flow through and the second fluid outlet is closed.