Valve device and steam turbine

A valve device comprising:

• a valve casing in which an inlet flow path into which fluid is configured to flow, an intermediate flow path that communicates with the inlet flow path and through which the fluid is configured to flow in a direction intersecting the inlet flow path, and an outlet flow path that communicates with the intermediate flow path and through which the fluid is configured to flow in a direction intersecting the intermediate flow path are formed;
• an outlet valve seat portion provided in the outlet flow path;
• an outlet valve body that comes into contact with the outlet valve seat portion such that the outlet flow path is closed;
• an outlet rod portion that extends along a first center axis and of which an end portion on a first side in a first center axis direction is connected to the outlet valve body;
• a linkage shaft portion that is configured to linearly move the outlet rod portion in the first center axis direction;
• an intermediate valve seat portion provided in the intermediate flow path;
• an intermediate valve body that comes into contact with the intermediate valve seat portion such that the intermediate flow path is closed;
• an intermediate rod portion that extends along a second center axis intersecting the first center axis and of which an end portion on a first side in a second center axis direction is connected to the intermediate valve body;
• and
• an intermediate actuator unit that is configured to linearly move the intermediate rod portion in the second center axis direction,
• wherein the intermediate actuator unit includes
• a hydraulic cylinder that configured to cause a piston rod portion to advance and retreat in a direction orthogonal to the second center axis direction, and
• a linking unit that connects the intermediate rod portion and the piston rod portion to each other, converts displacement of the piston rod portion into displacement in the second center axis direction, and transmits the displacement to the intermediate rod portion such that the intermediate rod portion is moved in the second center axis direction,
• wherein a rod insertion hole into which the intermediate rod portion is inserted is formed in the valve casing,
• wherein the hydraulic cylinder includes
• a cylinder portion in which control oil is accommodated, and
• a rod guide portion that has a tubular shape into which the piston rod portion is inserted and guides movement of the piston rod portion, and
• wherein a gap between an inner circumferential surface of the rod insertion hole and an outer circumferential surface of the intermediate rod portion is formed to be wider than a gap between an inner circumferential surface of the rod guide portion and an outer circumferential surface of the piston rod portion.