A transverse (22) and a longitudinal pressure gap (24) are arranged between the sealing ring (20) and the ring groove (35), which are connected to the pressure chamber.

Each turbine blade includes a platform with a pressure side seal slot extending into a pressure side of the platform and a suction side seal slot extending into a suction side of the platform.

Said counterforce presses the press rollers (2, 3) away from one another.

Said spring produces a counterforce in the press gap (7).

According to the invention, a pressure spring (13, 14) is arranged between the two press rollers (2, 3).

The pin seal includes a cylindrical shape and is located within a seal slot formed from the pressure side seal slot and the suction side seal slot of adjacent turbine blades.

The pressure slot (6) is subdivided into a high pressure chamber (12) and a low pressure chamber (13) with the aid of at least one additional sealing web (11, 11.1), each pressure chamber (12, 13) being provided with a delivery port (14, 15).

The pressure side seal slot and the suction side seal slot are each angled between three and ten degrees in the radial direction relative to the axis of the turbine disk.

The pump housing (4) is provided with a suction slot (5) and a pressure slot (6) which are separated from each other by means of a first sealing web (7, 7.1) and a second sealing web (8, 8.1) that is located opposite therefrom.