Patent ID: 8408248
Filing Date: 2013-04-02
Classification: F01D,F05D,Y10T

Abstract:
1. A rotary valve for controlling the steam throughput in a steam turbine, comprising: an immovable fixed ring; and a rotary ring which is arranged concentrically and rotatably on the fixed ring, wherein an angular position of the fixed ring may be changed by a servo motor, wherein the rotary valve is provided with a plurality of control profiles comprising a plurality of profile heads and a plurality of profile ends between which a plurality of control slots are formed, wherein the plurality of profile heads are arranged on the rotary ring and the plurality of profile ends are arranged on the fixed ring, wherein in a contact plane between the rotary ring and the fixed ring, the width of each control slot is equal to the width of each profile head, and the width of each profile head is equal to the width of the respective profile end, wherein a plurality of blades are arranged between the plurality of profile ends in the fixed ring, the plurality of blades dividing each control slot of the fixed ring into two partial slots, and wherein the rotary ring is operable to bring profile heads into position for blocking and for releasing the two partial slots with respect to passage of steam therethrough.