Radial rotary slide valve for controlling the steam flow rate in a steam turbine
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United States of America Patent
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Sep 1, 1998
Grant Date -
N/A
app pub date -
May 27, 1997
filing date -
May 24, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A radial rotary slide valve for controlling a steam flow rate in a steam turbine, includes an immobile fixed ring and a rotary ring which is disposed concentrically on the latter in such a way as to be rotatable into an angular position that can be varied through the use of a servo motor. The rotary ring has first control profiles which correspond to corresponding second control profiles belonging to the fixed ring in such a way that control slots situated between the control profiles can be varied for opening or closing. The rotary ring is divided into a top part and a bottom part by a joint in the region of a joint in the casing. In order to optimize the play required for sliding between the fixed ring and the rotary ring, the top part of the rotary ring and the bottom part of the rotary ring can be connected to one another by a suitable connecting device for varying the distance between at least two opposing half-ring ends. This makes it possible to vary an inside diameter of the rotary ring to accommodate the sliding play required for rotary movements between the rotary ring and the fixed ring.
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