US 12,276,349 B2
Steam valve and steam turbine plant
Osamu Shindo, Yokohama Kanagawa (JP); Miyako Nimori, Yokohama Kanagawa (JP); Shunichi Horii, Yokohama Kanagawa (JP); and Ryuhei Takemaru, Yokohama Kanagawa (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed on Dec. 5, 2022, as Appl. No. 18/075,075.
Claims priority of application No. 2021-202347 (JP), filed on Dec. 14, 2021.
Prior Publication US 2023/0184339 A1, Jun. 15, 2023
Int. Cl. F16K 3/26 (2006.01); F01D 17/10 (2006.01); F16K 3/314 (2006.01)
CPC F16K 3/262 (2013.01) [F16K 3/314 (2013.01); F01D 17/10 (2013.01); F05D 2220/31 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A steam valve comprising:
a main valve element capable of abutting on a valve seat;
an auxiliary valve element accommodated inside the main valve element, and inside which an auxiliary-valve steam flow path is formed; and
a valve rod coupled with the auxiliary valve element, and penetrating a valve hole formed in a valve seat,
the auxiliary valve element comprising:
an auxiliary-valve tubular part being a part capable of protruding from the main valve element in an opening direction in which the main valve element is opened;
an auxiliary-valve steam introduction hole formed through the auxiliary-valve tubular part, and through which steam is introduced to the auxiliary-valve steam flow path; and
an auxiliary-valve cap mounted at an end portion on the opening direction side of the auxiliary-valve tubular part,
the auxiliary valve element being structured to be in an open state in which the valve rod moves in the opening direction to increase a distance between the auxiliary-valve cap and the main valve element, thereby opening the auxiliary-valve steam introduction hole, and
to be in a fully-closed state in which the valve rod moves in a closing direction in which the main valve element is closed to bring the auxiliary-valve cap and the main valve element into contact with each other, thereby closing the auxiliary-valve steam introduction holes, and
a contact position in which the auxiliary-valve cap and the main valve element are brought into contact with each other being located outside in a radial direction of the valve rod from the outer peripheral surface, of the auxiliary-valve tubular part, through which the auxiliary-valve steam introduction holes are formed, wherein
a surface in which the main valve element abuts on the auxiliary-valve cap is an inclined surface inclined from a plane orthogonal to the center axis of the valve rod, and
the auxiliary-valve steam introduction hole is inclined from the plane orthogonal to the center axis of the valve rod.