| 摘要 |
PROBLEM TO BE SOLVED: To provide a main steam inlet part of a steam turbine improved to reduce the weight of a valve casing and a casing, to miniaturize them, and to reduce the cost in regard to structure and arrangement of a steam control valve provided in a main steam inlet part of a turbine by combining with a main steam stop valve. SOLUTION: This main steam inlet part of a steam turbine is structured by directly mounting a steam control valve 10, which is combined with a main steam stop valve 9, on an inside and an outside casings 1 and 2 of a turbine vehicle compartment and connecting it to a steam inlet of the casings so as to lead the main steam, which flows into through the main steam stop valve and the steam control valve, into a cascade 5 of the turbine. Several pairs (two pairs) of steam valve assembly, which are respectively structured by assembling a pair of a single steam control valve 10 (having 200 mm of bore) and a single main steam stop valve 9 in an integrally-structured valve casing 12, are directly mounted on the circumference of the turbine vehicle compartment, symmetrically arranging in the vertical and the lateral directions, and a steam outlet of the steam control valve 10 is communicated with the steam inlet, which is opened on the circumference of an upper and a lower half parts of the turbine casing, in the described position per each pair. COPYRIGHT: (C)2010,JPO&INPIT
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