A quick-release coupling for coupling fluid-conducting lines to one another, comprising: - a first coupling part and - a second coupling part, and a seal for sealing the two coupling parts (3, 5) when coupled together, and - a locking mechanism for coupling the two coupling parts (3, 5) together in a releasable manner, wherein - the first coupling part comprises a first valve arrangement and the second coupling part comprises a second valve arrangement, and wherein each of the two valve arrangements (11, 13) comprises an axially displaceable valve (15, 17) and a corresponding valve seat (19, 21) so that in the engaged state of the valve (15, 17) and the valve seat the respective fluid channel (31, 51) of the coupling part (3, 5) is sealed in a fluid-tight manner, and wherein the valves (15, 17) are arranged opposite to each other in the axial direction, wherein the valve of the first valve arrangement has an opening in which a plunger is mounted such that it is axially movable so that the plunger is movable from a first position to a second position, wherein in the second position the plunger projects further out of the valve of the first valve arrangement than in the first position, so that when the coupling parts (3, 5) are coupled together the plunger holds the two valves (15, 17) apart from one another so that the fluid channels (31, 51) of the coupling parts (3, 5) are connected together, and wherein the plunger is lockable relative to the valve in the second axial position by means of a locking device, characterized in that the locking mechanism is operatively connected to the locking device such that when the locking mechanism is actuated for decoupling the two coupling parts (3, 5) which are coupled together, the locking of the plunger is released and the two valves (15, 17) are engaged within the respective valve seat (19, 21) to seal the fluid channels (31, 51) of the coupling parts (3, 5) before the coupling parts are separated. - a first coupling part and - a second coupling part, and a seal for sealing the two coupling parts (3, 5) when coupled together, and - a locking mechanism for coupling the two coupling parts (3, 5) together in a releasable manner, wherein - the first coupling part comprises a first valve arrangement and the second coupling part comprises a second valve arrangement, and wherein each of the two valve arrangements (11, 13) comprises an axially displaceable valve (15, 17) and a corresponding valve seat (19, 21) so that in the engaged state of the valve (15, 17) and the valve seat the respective fluid channel (31, 51) of the coupling part (3, 5) is sealed in a fluid-tight manner, and wherein the valves (15, 17) are arranged opposite to each other in the axial direction, wherein the valve of the first valve arrangement has an opening in which a plunger is mounted such that it is axially movable so that the plunger is movable from a first position to a second position, wherein in the second position the plunger projects further out of the valve of the first valve arrangement than in the first position, so that when the coupling parts (3, 5) are coupled together the plunger holds the two valves (15, 17) apart from one another so that the fluid channels (31, 51) of the coupling parts (3, 5) are connected together, and wherein the plunger is lockable relative to the valve in the second axial position by means of a locking device, characterized in that the locking mechanism is operatively connected to the locking device such that when the locking mechanism is actuated for decoupling the two coupling parts (3, 5) which are coupled together, the locking of the plunger is released and the two valves (15, 17) are engaged within the respective valve seat (19, 21) to seal the fluid channels (31, 51) of the coupling parts (3, 5) before the coupling parts are separated.