Passenger compartment and method for manufacturing passenger compartment

A method for manufacturing a casing including

• a valve casing of a regulating valve in which an upper-half valve casing above in a vertical direction and a lower-half valve casing below in the vertical direction are included and a supply amount of steam to be supplied in a steam turbine is adjustable,
• a casing body that has an upper-half body above in the vertical direction and a lower-half body below in the vertical direction, is formed in a tubular shape centered on an axis line extending in an axial direction, and is connected to the valve casing,
• a pair of upper-half flanges that is connected to the upper-half valve casing and the upper-half body at both end portions in a circumferential direction around the axis line with respect to the upper-half body, and extends in the axial direction, and
• a pair of lower-half flanges that is connected to the lower-half valve casing and the lower-half body at both end portions in the circumferential direction with respect to the lower-half body, and extends in the axial direction,
• in which the upper-half body and the lower-half body each have a plurality of body block portions arranged in the axial direction,
• the upper-half valve casing has
• an inlet flow path that allows a valve body to be disposed and is formed in a linear shape in a first direction orthogonal to the vertical direction and the axial direction,
• an inlet opening that allows a fluid to flow into the inlet flow path and causes an end portion of the inlet flow path in the first direction to communicate with an outside,
• a plurality of exhaust flow paths that communicate with the inlet flow path at positions separated from each other in the first direction such that the fluid in the inlet flow path is caused to flow out in the vertical direction,
• a member insertion hole that causes the inlet flow path to communicate with the outside at a position facing the plurality of exhaust flow paths in the vertical direction, and
• an upper-half main steam supply path that is curved and communicates with a part of the plurality of exhaust flow paths,
• the lower-half valve casing has a lower-half main steam supply path that is curved and communicates with a remaining part of the plurality of exhaust flow paths,
• at least a part of the plurality of exhaust flow paths is disposed at a position separated from the member insertion hole when viewed from the vertical direction,
• the upper-half main steam supply path and the lower-half main steam supply path communicate with an outside of the upper-half valve casing and the lower-half valve casing only on one side in the axial direction, and
• the upper-half valve casing has
• an upper-half valve casing main body in which the inlet flow path, the inlet opening, the exhaust flow path, and the member insertion hole are formed,
• an upper-half closing member that is disposed below the upper-half valve casing main body in the vertical direction to form, together with the upper-half valve casing main body, the upper-half main steam supply path, and
• a welding portion that fixes the upper-half valve casing main body and the upper-half closing member to each other by welding, the manufacturing method comprising:
• a step of manufacturing the upper-half valve casing main body and the upper-half closing member;
• and
• a step of welding the upper-half valve casing main body and the upper-half closing member to each other, wherein
• in the step of manufacturing, one forged member formed by forging is cut to manufacture the upper-half valve casing main body and the upper-half closing member.