To prevent the generation of noise or vibration from the minute opening to the vicinity of the middle opening, and enable the improvement in the efficiency of a steam turbine by reducing the pressure drop at the full opening or its vicinity.
The steam governing valve 42 includes a valve chest 57 formed with a valve body 56, a valve seat 58 which has a spherically curved surface and which is provided for the valve main body at the position facing the valve chest, and a valve body 60 which is driven by a valve rod 59 and which has a spherically curved surface, and which is held in the valve chest. The opening of the steam governing valve is defined by the contact and separation of the spherically curved surfaces of the valve seat and the valve body. A recessed part 62 having an edge 61 at the rim is provided on the bottom side of the valve body. A chamber member 63 located on the outside of the valve body and a flow guide 64 arranged in the recessed part of the valve body is provided for the valve body 56. The steam passage 65 at the full opening or its vicinity is formed by the chamber member, the valve body, the flow guide, the inner peripheral surface 56A of the valve main body, and the valve seat.
Shunguchi Sekiguchi
Akio Saruwatari
Osamu Kawamura
Takehiko Yamada
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