Injection moulding tool

An injection moulding tool comprising a hot-runner manifold plate, at least one nozzle holder resting on said hot-runner manifold plate, a shut-off needle which is movably guided in said nozzle holder, and a piston arranged in a piston chamber and adapted to be actuated by a fluid, said piston being connected to the shut-off needle and moving said shut-off needle to its various positions, and said hot-runner manifold plate comprising at least one distributor channel, said nozzle holder comprising at least one supply channel which is associated with said shut-off needle, and said at least one distributor channel being connected to said at least one supply channel, the piston chamber being integrated in the nozzle holder in such a way that the piston is arranged between the shut-off needle and the hot-runner manifold plate, the nozzle holder having a rear area with which it rests on the hot-runner manifold plate, the piston chamber being open at said rear area of the nozzle holder, and the piston chamber being essentially closed by the hot-runner manifold plate at said rear area.