Valve device

Abstract

To stably change an aperture from a state where the aperture is maintained for a long time.SOLUTION: A valve device comprises: a valve rod which connects a valve body and a piston and is movable forward and backward in a first direction integrally with the valve body and the piston; a rotary sleeve which is supported freely rotatably in a first circumferential direction around a first center axis with respect to a valve casing; an operation member which rotates an operation shaft in a second circumferential direction; a forward / backward moving sleeve which is fixed to the valve rod and the piston so as not to move; and a stopper member which regulates a moving amount of the forward / backward moving sleeve to a first side in the first direction. The operation shaft and the rotary sleeve are connected in a state where the rotations of the operation shaft in the second circumferential direction can be converted into rotations in the first circumferential direction and transmitted to the rotary sleeve. The forward / backward moving sleeve is movable in the first direction in a case where the rotary sleeve is rotated in the first circumferential direction. The stopper member can be brought into contact with the forward / backward moving sleeve in a case where the forward / backward moving sleeve is moved to the first side in the first direction just by a specific value.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a valve device. [Background technology]

[0002] A steam valve such as a main shutoff valve is provided in a flow path that supplies steam to a steam turbine. Such a steam valve opens and closes the steam flow path to adjust the flow rate of steam supplied to the steam turbine, shut off the steam, etc., as disclosed in Patent Document 1, for example. The steam valve includes a valve body that opens and closes the flow path, a valve stem connected to the valve body, and a valve drive mechanism that moves the valve stem back and forth in the axial direction of the valve stem. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent No. 2020 / 0256207 Summary of the Invention [Problem to be solved by the invention]

[0004] In the steam valve described in Patent Document 1, it is conceivable that in an emergency, the valve body can be manually opened and closed by moving the valve stem forward and backward in the axial direction of the valve stem using a handle or the like provided on the outside of the steam valve. In such a case, an advancing and retracting member may be used that rotates about the axis of the valve stem by transmitting the rotation of the handle, thereby advancing and retracting the valve stem.

[0005] In a valve device such as the steam valve described above, when the valve is fully opened or fully closed, the retractable member abuts against the valve casing or a stopper formed in a part of the valve casing. At this time, the retractable member, which moves in the axial direction of the valve stem while rotating about its axis, comes into contact with the stopper. If this contact state is maintained for a long period of time, the retractable member and the stopper may become stuck together. As a result, in an emergency, when changing the opening degree from a state in which the opening degree has been maintained for a long period of time, the retractable member cannot move, making it difficult to change the opening degree midway.

[0006] The present disclosure has been made to solve the above-mentioned problem, and aims to provide a valve device that can stably change the opening degree from a state in which the opening degree is maintained for a long period of time. [Means for solving the problem]

[0007] In order to solve the above problems, a valve device according to the present disclosure includes a valve casing having a flow path formed therein through which a fluid flows; a valve body that is movable forward and backward in a first direction within the valve casing and capable of opening and closing the flow path; a piston that is disposed within the valve casing and is hydraulically driven to move forward and backward in the first direction; a valve stem that extends in the first direction about a first central axis, connects the valve body and the piston, and is movable forward and backward in the first direction integrally with the valve body and the piston; a rotating sleeve that is disposed radially outward from the valve stem about the first central axis, is formed in a cylindrical shape to cover the valve stem, and is supported relative to the valve casing so as to be rotatable in a first circumferential direction about the first central axis; an operating shaft that is disposed radially outward from the rotating sleeve and extends in a second direction intersecting the first direction about a second central axis; and a valve shaft that is fixed to a base end of the operating shaft in the second direction outside the valve casing and is fixed to the second the operating shaft and the rotating sleeve are connected in a state in which rotation of the operating shaft in the second circumferential direction is converted into rotation in the first circumferential direction and transmitted to the rotating sleeve, and the advancing / retracting sleeve is movable in the first direction when the rotating sleeve rotates in the first circumferential direction, and the stopper member is capable of contacting the advancing / retracting sleeve when the advancing / retracting sleeve moves to the first side in the first direction by the specified amount. [Effects of the Invention]

[0008] According to the valve device of the present disclosure, the opening degree can be stably changed from a state in which the opening degree has been maintained for a long period of time. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating a schematic configuration of a steam turbine including a valve device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view of the valve device. [Figure 3] FIG. 2 is a cross-sectional view showing a configuration of a valve drive unit of the valve device. [Figure 4] FIG. 2 is an enlarged cross-sectional view showing a main part of the valve drive unit. [Figure 5] 10 is a view of the stopper member with the valve stem inserted therein, viewed from the second side in the first direction. FIG. [Figure 6] FIG. 3 is a cross-sectional view showing the valve device in a closed state of the valve body. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A valve device according to an embodiment of the present disclosure will be described below with reference to the accompanying drawings. However, the present disclosure is not limited to this embodiment.

[0011] (Steam turbine configuration) As shown in FIG. 1, the steam turbine 1 includes a turbine body 100 and a valve device 2.

[0012] Steam (fluid) is supplied to the turbine body 100 from a steam supply source 200 such as a boiler. In the turbine body 100, a rotor (not shown) that is rotatably disposed within a casing (not shown) is rotated by the supplied steam. The rotation of this rotor (not shown) is transmitted to, for example, a generator via an output shaft to generate electricity.

[0013] The valve device 2 is connected to an inlet (not shown) of the turbine body 100. The valve device 2 is capable of adjusting the amount of steam supplied to the turbine body 100. The valve device 2 in this embodiment is a stop valve (TripAND Throttle Valve; TTV). The valve device 2 is capable of emergency shutting off the supply of steam to the turbine body 100. In this embodiment, the normal operation state of the valve device 2 is a state (fully open state) in which the valve device 2 continues to supply steam to ensure steady operation of the turbine body 100. Furthermore, the emergency shutdown state of the valve device 2 is a state (fully closed state) in which the supply of steam is shut off to emergency shut down the turbine body 100 when an abnormality in a rotating body or plant equipment occurs and an emergency shutdown of the turbine body 100 and the plant is required.

[0014] As shown in FIG. 2, the valve device 2 includes a valve casing 10, a valve section 20, and a valve drive section 30. In the following description, the direction in which a valve body 22 (described later) moves back and forth within the valve casing 10 is referred to as a first direction Da, and the direction intersecting the first direction Da (in this embodiment, the direction perpendicular to the first direction Da) is referred to as a second direction Db. In this embodiment, the first direction Da is the vertical direction. In the valve device 2, the side on which the valve section 20 is disposed relative to the valve drive section 30 is referred to as a first side Da1 of the first direction Da. In addition, in the first direction Da, the side on which the valve drive section 30 is disposed relative to the valve section 20, opposite to the first side Da1, is referred to as a second side Da2 of the first direction Da. In other words, in this embodiment, the first side Da1 of the first direction Da is upward in the vertical direction, and the second side Da2 of the first direction Da is downward in the vertical direction.

[0015] The second direction Db is not limited to being a direction perpendicular to the first direction Da as in this embodiment, but may be a direction that intersects the first direction Da at an angle.

[0016] The valve casing 10 constitutes the exterior of the valve device 2. A flow path 10r through which steam (fluid) can flow is formed inside the valve casing 10. The valve casing 10 of this embodiment has a first casing portion 10A, a second casing portion 10B, and a third casing portion 10C.

[0017] The first casing part 10A constitutes a region of the first side Da1 in the first direction of the valve casing 10. The first casing part 10A accommodates the valve part 20 therein. The first casing part 10A has a valve chamber 11, an inlet flow path part 12, and an outlet flow path part 13. In this embodiment, a flow path 10r is formed inside the first casing part 10A.

[0018] The valve chest 11 accommodates the valve portion 20, which will be described later. The valve chest 11 has an inlet-side opening 11a that opens toward a first side Db1 in the second direction Db, and an outlet-side opening 11b that opens toward a second side Da2 in the first direction Da. That is, the inlet-side opening 11a and the outlet-side opening 11b are open so as to be perpendicular to each other. In the valve chest 11, steam flows from the inlet-side opening 11a toward the outlet-side opening 11b.

[0019] The first side Db1 in the second direction Db is the side on which the operating member 43 is disposed relative to the operating shaft 41, which will be described later. The second side Db2 in the second direction Db is the side on which the operating shaft 41 is disposed relative to the operating member 43.

[0020] The inlet flow path section 12 forms an opening into which steam flowing from the upstream side of the valve device 2 flows in. The inlet flow path section 12 is formed in a cylindrical shape extending in the second direction Db. The inlet flow path section 12 extends to a first side Db1 in the second direction Db with respect to the valve chest 11. One end 12a of the inlet flow path section 12 is connected to a line such as a pipe connected to the steam supply source 200. The other end 12b of the inlet flow path section 12 communicates with the inlet side opening 11a.

[0021] The outlet flow path section 13 forms an opening for discharging steam downstream of the valve device 2. The outlet flow path section 13 is formed in a cylindrical shape extending in the second direction Db. The outlet flow path section 13 extends to a second side Db2 in the second direction Db so as to face the opposite side of the inlet flow path section 12 with respect to the valve chest 11. One end 13a of the outlet flow path section 13 is connected to a line such as a pipe connected to the suction port of the turbine body 100. The other end 13b of the outlet flow path section 13 communicates with the outlet-side opening 11b. As a result, a flow path 10r is formed inside the first casing section 10A through which steam flows from the inlet flow path section 12 via the valve chest 11 to the outlet flow path section 13.

[0022] The second casing portion 10B constitutes an area of ​​the second side Da2 in the first direction in the valve casing 10. The second casing portion 10B covers a portion of the valve drive portion 30. The second casing portion 10B is disposed at a position spaced apart from the first casing portion 10A on the second side Da2 in the first direction Da. As shown in FIGS. 2 and 3 , the second casing portion 10B has a cylindrical wall portion 15, a first wall portion 16, a second wall portion 17, a third wall portion 18, and an oil supply / discharge portion 19.

[0023] The cylindrical wall portion 15 is formed in a cylindrical shape centered on a first central axis C1 extending in the first direction Da. The first wall portion 16, the second wall portion 17, and the third wall portion 18 are each formed in a plate shape along a plane intersecting the first central axis C1. The first wall portion 16 closes the end of the cylindrical wall portion 15 on the second side Da2 in the first direction Da.

[0024] The third wall portion 18 closes the end of the cylindrical wall portion 15 on the first side Da1 in the first direction Da. As shown in Fig. 4, a through hole 18h is formed in the center of the third wall portion 18, penetrating the third wall portion 18 in the first direction Da. A guide sleeve 51 is fixed to the inner circumferential surface of the through hole 18h. The guide sleeve 51 guides the valve stem 33 (described later) so that it moves linearly in the first direction Da.

[0025] The guide sleeve 51 integrally includes a guide portion 511 and a flange portion 512. The guide portion 511 is formed in a cylindrical shape centered on the first central axis C1. The guide portion 511 is inserted into a through hole 18h formed in the third wall portion 18. The flange portion 512 protrudes from an end of the guide portion 511 on the second side Da2 in the first direction Da to the outer side Dro in the radial direction Dr. When viewed from the first direction Da, the flange portion 512 is formed in an annular shape extending in the first circumferential direction Dc1. The flange portion 512 is fitted into an accommodating groove 18m formed in a surface 18f of the third wall portion 18 facing the second side Da2 in the first direction Da. A gap between the through hole 18h and the valve rod 33 is sealed by arranging an oil seal (not shown) or the like on the first side Da1 in the first direction Da of the guide sleeve 51.

[0026] As shown in Fig. 3, the second wall portion 17 is disposed between the first wall portion 16 and the third wall portion 18 in the first direction Da. A through hole 17h (see Fig. 4) penetrating the second wall portion 17 in the first direction Da is formed in the center of the second wall portion 17. The through hole 17h is formed at a position in the radial direction Dr that overlaps with the through hole 18h. A pair of bearings 343 (see Fig. 4) are fixed to the inner circumferential surface of the through hole 17h.

[0027] Additionally, second casing portion 10B defines an internal space by cylindrical wall portion 15, first wall portion 16, and third wall portion 18. Furthermore, the space of second casing portion 10B is partitioned by second wall portion 17 into piston chamber 14a and gear chamber 14b.

[0028] The piston chamber 14a is a space surrounded by the cylindrical wall portion 15, the first wall portion 16, and the second wall portion 17. A piston 32 (described later) is accommodated in the piston chamber 14a so as to be movable in the first direction Da. Oil (described later) is stored in the piston chamber 14a. The piston 32 divides the piston chamber 14a into a first piston chamber 141 on a first side Da1 in the first direction Da and a second piston chamber 142 on a second side Da2 in the first direction Da.

[0029] The gear chamber 14b is a space surrounded by the cylindrical wall portion 15, the second wall portion 17, and the third wall portion 18. A driven gear 342 and a drive gear 44, which will be described later, are housed in the gear chamber 14b.

[0030] The oil supply / discharge section 19 is in communication with the piston chamber 14a. The oil supply / discharge section 19 has an emergency trip cylinder 19a and a drain passage 19b. The piston chamber 14a is filled with oil, and the drain passage 19b is normally blocked by the emergency trip cylinder 19a. In an emergency, the emergency trip cylinder 19a connects the first piston chamber 141 and the second piston chamber 142 with the drain passage 19b. This allows the oil in the piston chamber 14a to be discharged to the outside through the drain passage 19b.

[0031] As shown in Fig. 2, the third casing portion 10C is disposed between the first casing portion 10A and the second casing portion 10B in the first direction Da. The third casing portion 10C is formed in a cylindrical shape extending in the first direction Da around the first central axis C1. The third casing portion 10C is fixed so as not to move with respect to the first casing portion 10A and the second casing portion 10B. The third casing portion 10C is formed between the first casing portion 10A and the second casing portion 10B so as to cover a portion of the valve rod 33 (described later).

[0032] The valve section 20 is capable of adjusting the flow state of steam from the inlet opening 11a to the outlet opening 11b in the valve chest 11. The valve section 20 of this embodiment includes a valve support 21, a valve body 22, a valve seat 23, and a strainer 24.

[0033] The valve support 21 guides movement of the valve body 22 in the first direction Da. The valve support 21 is fixed to an inner surface 11t of the valve chamber 11 that faces a first side Da1 in the first direction Da. The valve support 21 has a cylindrical portion 21c that extends cylindrically in the first direction Da with the first central axis C1 as its center. The cylindrical portion 21c extends toward a second side Da2 in the first direction Da so as to protrude from the inner surface 11t.

[0034] The valve body 22 is movable back and forth in the first direction Da within the first casing portion 10A. The valve body is capable of opening and closing the flow path 10r. The valve body 22 of this embodiment extends cylindrically in the first direction Da around the first central axis C1. The valve body 22 is disposed inside the cylindrical portion 21c. The valve body 22 is disposed such that its outer peripheral surface is in sliding contact with the inner peripheral surface of the cylindrical portion 21c. The valve body 22 is movable back and forth in the first direction Da within the cylindrical portion 21c. This allows the valve body 22 to move so as to protrude from the inside of the cylindrical portion 21c.

[0035] The valve seat 23 is capable of closing the outlet opening 11b by coming into contact with the valve body 22. The valve seat 23 is an annular member centered on the first central axis C1. The valve seat 23 is disposed along the periphery of the outlet opening 11b of the valve chamber 11. When the valve body 22 is spaced from the valve seat 23 toward the first side Da1 in the first direction Da, the inlet flow path 12 and the outlet flow path 13 communicate with each other through the gap between the valve body 22 and the valve seat 23. When the valve body 22 is in contact with the valve seat 23, the valve seat 23 closes the outlet opening 11b. This blocks the flow of steam in the valve chamber 11 between the inlet flow path 12 and the outlet flow path 13.

[0036] The strainer 24 is disposed in the valve chamber 11. The strainer 24 captures foreign matter contained in the steam flowing from the inlet flow path 12 and prevents it from flowing into the outlet flow path 13. The strainer 24 captures foreign matter mixed in the steam and allows only the steam to pass through. The strainer 24 is, for example, a metal mesh material. The strainer 24 is, for example, fixed to the outer periphery of the valve support 21 and disposed so as to block the inlet opening 11a.

[0037] The valve driver 30 is capable of driving the valve body 22 to move back and forth in a first direction Da relative to the valve seat 23 within the valve chamber 11. The valve driver 30 is disposed in the second casing portion 10B and the third casing portion 10C. As shown in FIGS. 3 and 4 , the valve driver 30 of this embodiment includes a piston 32, a valve stem 33, a rotating sleeve 34, a reciprocating sleeve 35, a coil spring 36, a manual operation portion 40, and a stopper member 50.

[0038] The piston 32 is disposed within the piston chamber 14a. The piston 32 is hydraulically movable back and forth in a first direction Da within the piston chamber 14a. The piston 32 of this embodiment integrally includes a piston body 321, a boss portion 322, and a first cylindrical portion 323.

[0039] The piston body 321 is formed to be in sliding contact with the inner circumferential surface of the cylindrical wall portion 15. The piston body 321 is formed in a disk shape centered on the first central axis C1. The piston body 321 divides the piston chamber 14a into a first piston chamber 141 and a second piston chamber 142. The boss portion 322 protrudes from a center portion of the piston body 321 toward a second side Da2 in the first direction Da. The boss portion 322 is disposed within the second piston chamber 142. When the piston 32 moves within the piston chamber 14a toward the second side Da2 in the first direction Da, the boss portion 322 is accommodated in a boss accommodating portion 161 formed in the first wall portion 16. The boss accommodating portion 161 is formed in a cylindrical shape centered on the first central axis C1. The boss accommodating portion 161 protrudes in a cylindrical shape from the first wall portion 16 toward the first side Da1 in the first direction Da. The first cylindrical portion 323 protrudes from the center of the piston body 321 to the first side Da1 in the first direction Da. The first cylindrical portion 323 is formed in a cylindrical shape centered on the first central axis C1. The first cylindrical portion 323 is formed to have a smaller diameter than the piston body 321 and the boss portion 322. The first cylindrical portion 323 is disposed within the first piston chamber 141.

[0040] The piston 32 also has a communication hole 325 that connects the first piston chamber 141 and the second piston chamber 142 in the first direction Da relative to the piston body 321. The communication hole 325 is formed to penetrate the piston body 321 and the boss portion 322. The communication hole 325 connects the inner circumferential surface of the first cylindrical portion 323 with the outer circumferential surface of the boss portion 322. Some of the oil in the second piston chamber 142 flows into the inside of the first cylindrical portion 323 through this communication hole 325. Then, some of the oil that has flowed into the inside of the first cylindrical portion 323 flows into the first piston chamber 141.

[0041] As shown in FIG. 2, the valve rod 33 connects the valve body 22 and the piston 32. The valve rod 33 extends columnarly in the first direction Da around the first central axis C1. This allows the valve rod 33 to move back and forth in the first direction Da together with the valve body 22 and the piston 32. Specifically, an end of the valve rod 33 on a first side Da1 in the first direction Da is immovably connected to the valve body 22. As shown in FIG. 4, an end of the valve rod 33 on a second side Da2 in the first direction Da is inserted into the first cylindrical portion 323 and immovably connected to the piston 32. Also, as shown in FIG. 2, the valve rod 33 penetrates the second wall portion 17, the third wall portion 18, and the first casing portion 10A at a middle portion in the first direction Da.

[0042] As shown in Fig. 4, the rotating sleeve 34 is disposed on the outer side Dro in the radial direction Dr relative to the valve stem 33. The rotating sleeve 34 is formed in a cylindrical shape so as to cover the valve stem 33. The rotating sleeve 34 is supported by the second casing portion 10B so as to be rotatable in a first circumferential direction Dc1 about the first central axis C1. The rotating sleeve 34 of this embodiment integrally includes a second cylindrical portion 341 and a driven gear 342.

[0043] In this embodiment, the radial direction Dr is the radial direction of the valve device 2 centered on the first central axis C1. In other words, the radial direction Dr is a direction perpendicular to the first central axis C1. The inner side Dri of the radial direction Dr is the side approaching the first central axis C1 in the radial direction Dr. The outer side Dro of the radial direction Dr is the side away from the first central axis C1 in the radial direction Dr. The first circumferential direction Dc1 is the circumferential direction of the valve device 2 based on the first central axis C1 (valve stem 33).

[0044] The second cylindrical portion 341 is formed in a cylindrical shape centered on the first central axis C1. The second cylindrical portion 341 is disposed within the through hole 17h. The second cylindrical portion 341 is supported via a pair of bearings 343 to be rotatable in a first circumferential direction Dc1 about the first central axis C1 relative to the second wall portion 17. The second cylindrical portion 341 is supported so as to be immovable in the first direction Da relative to the second wall portion 17. The second cylindrical portion 341 also has a female thread portion 341m on its inner circumferential surface facing inward Dri in the radial direction Dr.

[0045] The driven gear 342 is fixed to an end of the second cylindrical portion 341 on the first side Da1 in the first direction Da. The driven gear 342 is formed integrally with the second cylindrical portion 341. The driven gear 342 is disposed on the first side Da1 in the first direction Da with respect to the second wall portion 17. In other words, the driven gear 342 is disposed in the gear chamber 14b. The driven gear 342 is a conical bevel gear resembling an umbrella. The driven gear 342 has a plurality of gear teeth 342g spaced apart in the first circumferential direction Dc1.

[0046] The retractable sleeve 35 is disposed on the inside in the radial direction Dr relative to the rotating sleeve 34. The retractable sleeve 35 is formed in a cylindrical shape centered on the first central axis C1 so as to cover the valve rod 33 from the outside Dro in the radial direction Dr. That is, when viewed from the first direction Da, the retractable sleeve 35 is disposed between the outer circumferential surface of the valve rod 33 and the inner circumferential surface of the rotating sleeve 34. The retractable sleeve 35 is fixed so as not to move relative to the valve rod 33 and the piston 32. The retractable sleeve 35 is movable in the first direction Da relative to the rotating sleeve 34. Therefore, when the rotating sleeve 34 rotates in the first circumferential direction Dc1 relative to the second casing portion 10B, the retractable sleeve 35 moves in the first direction Da. The retractable sleeve 35 of this embodiment integrally includes a third cylindrical portion 351 and an expanded diameter portion 352.

[0047] The third cylindrical portion 351 is formed in a cylindrical shape centered on the first central axis C1. The third cylindrical portion 351 is formed to be longer in the first direction Da than the rotating sleeve 34. The third cylindrical portion 351 protrudes from the rotating sleeve 34 on both sides, a first side Da1 and a second side Da2, in the first direction Da. In other words, only a portion near the center of the third cylindrical portion 351 is disposed in a position overlapping with the rotating sleeve 34 in the first direction Da. The third cylindrical portion 351 is fixed to the valve stem 33 and the piston 32 in an immovable manner. The third cylindrical portion 351 has a tip surface 35s facing the first side Da1 in the first direction Da. The tip surface 35s is a flat surface located at the most first side Da1 in the first direction Da of the retractable sleeve 35.

[0048] The expanded diameter portion 352 is formed at a position closer to the piston 32 in the first direction Da with respect to the rotating sleeve 34. The expanded diameter portion 352 is disposed within the first piston chamber 141. The expanded diameter portion 352 protrudes from the outer circumferential surface of the third cylindrical portion 351 toward the outer side Dro in the radial direction Dr. In other words, the expanded diameter portion 352 protrudes further toward the outer side Dro in the radial direction Dr than the inner circumferential surface of the second cylindrical portion 341 disposed within the third cylindrical portion 351. The expanded diameter portion 352 is formed in an annular shape extending around the first circumferential direction Dc1 when viewed from the first direction Da.

[0049] The third cylindrical portion 351 has a male thread portion 351m on the second side Da2 in the first direction Da with respect to the expanded diameter portion 352. The male thread portion 351m is formed on the outer circumferential surface of the third cylindrical portion 351 that faces the outer side Dro in the radial direction Dr. The male thread portion 351m meshes with the female thread portion 341m of the second cylindrical portion 341.

[0050] 3, the coil spring 36 is disposed between the piston 32 and the second wall portion 17. That is, the coil spring 36 is disposed inside the first piston chamber 141. The coil spring 36 is disposed in a compressed state so as to bias the piston body 321 toward the second side Da2 in the first direction Da relative to the second wall portion 17.

[0051] The manual operation unit 40 can move the valve stem 33 back and forth in the first direction Da by being manually operated by an operator or the like from outside the valve device 2. The manual operation unit 40 of this embodiment includes an operation shaft 41, a support cylinder 42, an operation member 43, a drive gear 44, and an operation unit bearing 45.

[0052] The operating shaft 41 is disposed between the second wall portion 17 and the third wall portion 18 in the first direction Da. The operating shaft 41 is disposed on the outer side Dro in the radial direction Dr with respect to the rotating sleeve 34. The operating shaft 41 extends in the second direction Db around the second central axis C2. The operating shaft 41 extends so as to protrude from the inside of the cylindrical wall portion 15 to the outer side Dro in the radial direction Dr.

[0053] The support cylinder 42 is formed in a cylindrical shape with the second central axis C2 as its center. The support cylinder 42 is formed to be shorter than the operating shaft 41 in the second direction Db. The support cylinder 42 covers the operating shaft 41. Therefore, a base end portion of the operating shaft 41 on a first side Db1 in the second direction Db protrudes toward the outside Dro in the radial direction Dr relative to the support cylinder 42. A tip end portion of the operating shaft 41 on a second side Db2 in the second direction Db protrudes toward the inside Dri in the radial direction Dr relative to the support cylinder 42. The support cylinder 42 is fixed to the cylindrical wall portion 15 in a state where it penetrates the cylindrical wall portion 15 in the radial direction Dr. A pair of operating unit bearings 45 are fixed to the inner peripheral surface of the support cylinder 42, spaced apart in the second direction Db.

[0054] The pair of operation unit bearings 45 support the operating shaft 41 rotatably in the second circumferential direction Dc2 about the second central axis C2 with respect to the support cylinder 42. As a result, the operating shaft 41 is inserted into the support cylinder 42. The pair of operation unit bearings 45, which are arranged at an interval in the second direction Db, allow the operating shaft 41 to rotate in the second circumferential direction Dc2 around the second central axis C2 with respect to the support cylinder 42.

[0055] The operating member 43 is fixed to a base end of the operating shaft 41 in the second direction Db outside the second casing portion 10B. The operating member 43 rotates the operating shaft 41 in the second circumferential direction Dc2 around the second central axis C2. The operating member 43 in this embodiment is a so-called handle. That is, the operating member 43 has a shape that is easy for an operator to grip and has a much larger diameter than the operating shaft 41.

[0056] As shown in FIG. 4 , the drive gear 44 is fixed to the tip end of the operating shaft 41 in the second direction Db inside the second casing portion 10B. The drive gear 44 is formed integrally with the operating shaft 41. The drive gear 44 is disposed on the first side Da1 in the first direction Da with respect to the second wall portion 17. In other words, the drive gear 44 is disposed in the gear chamber 14b. The drive gear 44 is an umbrella-shaped bevel gear. The drive gear 44 has a plurality of gear teeth 44g spaced apart in the second circumferential direction Dc2. The gear teeth 44g of the drive gear 44 mesh with the gear teeth 342g of the driven gear 342. As a result, the operating shaft 41 and the second cylindrical portion 341 are connected in a state in which the rotation of the operating shaft 41 in the second circumferential direction Dc2 can be converted into rotation in the first circumferential direction Dc1 by the drive gear 44 and the driven gear 342 and transmitted to the rotating sleeve 34.

[0057] In this manual operation unit 40, when an operator manually rotates the operation member 43 in the second circumferential direction Dc2, the operation shaft 41 and the drive gear 44 rotate integrally with the operation member 43 in the second circumferential direction Dc2. The rotation of the drive gear 44 about the second circumferential direction Dc2 is transmitted to the driven gear 342. As a result, the driven gear 342 rotates together with the second cylindrical portion 341 in the first circumferential direction Dc1. In other words, the rotating sleeve 34 is rotationally driven in the first circumferential direction Dc1 by the manual operation unit 40. In this manner, the drive gear 44 and the driven gear 342 constitute a rotation transmission mechanism 40D of the valve device 2. The rotation transmission mechanism 40D connects the operation shaft 41 and the rotating sleeve 34 so as to convert the rotation of the operation shaft 41 in the second circumferential direction Dc2 into rotation in the first circumferential direction Dc1 and transmit the rotation to the rotating sleeve 34.

[0058] Furthermore, when the rotating sleeve 34 rotates in the first circumferential direction Dc1, the retractable sleeve 35, which has a male thread portion 351m that meshes with the female thread portion 341m of the rotating sleeve 34, moves in the first direction Da relative to the rotating sleeve 34. As a result, the valve stem 33, the piston 32, and the valve body 22 move in the first direction Da together with the retractable sleeve 35. Because the retractable sleeve 35 and the valve stem 33 are fixed, the retractable sleeve 35 moves linearly in the first direction Da without rotating together with the rotating sleeve 34 in the first circumferential direction Dc1.

[0059] The stopper member 50 restricts the movement of the retractable sleeve 35 toward the first side Da1 in the first direction Da to a predetermined value. The stopper member 50 is capable of contacting the retractable sleeve 35 when the retractable sleeve 35 moves toward the first side Da1 in the first direction Da by the predetermined amount. The stopper member 50 is fixed to the valve casing 10 at a position closer to the valve body 22 in the first direction Da than the retractable sleeve 35. The stopper member 50 is formed to protrude from the inner circumferential surface of the valve casing 10 toward the second side Da2 in the first direction Da. In this embodiment, the stopper member 50 is formed as a single component integral with the guide sleeve 51 fixed to the third wall portion 18. The stopper member 50 is formed to extend from the flange portion 512 toward the second side Da2 in the first direction Da. As a result, the stopper member 50 is disposed in a state where it protrudes from the surface 18f of the third wall portion 18 toward the second side Da2 in the first direction Da. The stopper member 50 is formed in an annular shape centered on the first central axis C1 so as to cover the valve rod 33 from the outer side Dro in the radial direction Dr. The stopper member 50 of this embodiment has a restriction surface 501, a communication portion 502 (see FIG. 5), and a recess 503.

[0060] The restriction surface 501 is formed on an end portion of the stopper member 50 on the second side Da2 in the first direction Da. The restriction surface 501 faces the piston 32 in the first direction Da. That is, the restriction surface 501 faces the second side Da2 in the first direction Da. The restriction surface 501 is formed as a plane perpendicular to the first direction Da. The restriction surface 501 can come into contact with only the tip surface 35s when the retractable sleeve 35 moves a specified amount toward the first side Da1 in the first direction Da.

[0061] 5, the communicating portion 502 communicates the inside with the outside in the radial direction Dr when the restricting surface 501 is in contact with the retractable sleeve 35. In other words, when the restricting surface 501 is in contact with the tip surface 35s in the first direction Da, the communicating portion 502 communicates between a minute gap between the inner circumferential surface, which is the inside of the stopper member 50, and the valve rod 33 and the gear chamber 14b, which is the outside of the stopper member 50. The communicating portion 502 of this embodiment has a groove 502m recessed from the restricting surface 501 toward the first side Da1 in the first direction Da and extending in the radial direction Dr. A plurality of communicating portions 502 (grooves 502m) are formed at intervals in the first circumferential direction Dc1.

[0062] The recess 503 is formed in the stopper member 50 so as to be recessed from the restricting surface 501 in the first direction Da, and also recessed from an inner circumferential surface 50f facing the inside Dri in the radial direction Dr to the outside Dro in the radial direction Dr.

[0063] In the stopper member 50, a specified value for the amount of movement of the retractable sleeve 35 is set so that the valve body 22 does not move further toward the first side Da1 in the first direction Da from the state in which the valve device 2 is fully open, i.e., the state in which the valve body 22 is furthest from the valve seat 23 toward the first side Da1 in the first direction Da. In other words, the state in which the stopper member 50 and the retractable sleeve 35 are in contact is the fully open state.

[0064] 4, the stopper member 50 of this embodiment restricts the amount of movement of the retractable sleeve 35 so that a gap S is formed in the first direction Da between the retractable sleeve 35 and the rotating sleeve 34 when the stopper member 50 and the retractable sleeve 35 are in contact with each other. More specifically, the stopper member 50 restricts the amount of movement of the retractable sleeve 35 so that a gap S is formed in the first direction Da between the expanded diameter portion 352 and the second cylindrical portion 341 when the restriction surface 501 and the tip end surface 35s are in contact with each other.

[0065] Next, the operation of the valve device 2 described above will be described. As shown in FIG. 2, during normal operation of the valve device 2, the piston 32 is positioned on the first side Da1 in the first direction Da, closer to the second wall portion 17, against the biasing force of the coil spring 36, due to the pressure (hydraulic pressure) of the oil filled in the second piston chamber 142. As a result, the valve stem 33 connected to the piston 32 also moves to the first side Da1 in the first direction Da. As a result, the valve body 22 connected to the valve stem 33 is positioned on the first side Da1 in the first direction Da, away from the outlet-side opening 11b within the valve chamber 11. Therefore, the valve body 22 is furthest from the valve seat 23 on the first side Da1 in the first direction Da. In this fully open state, the inlet-side opening 11a and the outlet-side opening 11b communicate with each other, and steam flows from the inlet channel portion 12 to the outlet channel portion 13, passing around the valve portion 20.

[0066] During an emergency shutdown, the emergency trip cylinder 19a discharges oil from the piston chamber 14a into the drain passage 19b. As a result, the piston 32 is pushed by the biasing force of the coil spring 36 and moves toward the second side Da2 in the first direction Da, closer to the first wall portion 16. As a result, as shown in FIG. 6 , the valve stem 33 connected to the piston 32 also moves toward the second side Da2 in the first direction Da. Therefore, the valve body 22 connected to the valve stem 33 is positioned on the second side Da2 in the first direction Da within the valve chamber 11, closer to the outlet opening 11b. As a result, the valve body 22 contacts the valve seat 23, completely closing the outlet opening 11b. In this fully closed state, the inlet opening 11a and the outlet opening 11b are not in communication, and steam cannot flow from the inlet passage 12 to the outlet passage 13 around the valve element 20.

[0067] Therefore, in the valve device 2, when the piston 32 moves back and forth in the first direction Da due to fluctuations in oil pressure (changes in the amount of oil) inside the second casing part 10B, the valve stem 33 connected to the piston 32 and the valve body 22 move back and forth in the first direction Da together with the piston 32. As a result, the valve body 22 moves back and forth in the first direction Da inside the first casing part 10A, opening and closing the flow path 10r through which the fluid flows.

[0068] 2, when an operator operates the operating member 43 outside the valve casing 10, the operating shaft 41 extending in the second direction Db rotates in the second circumferential direction Dc2. The rotation of the operating shaft 41 in the second circumferential direction Dc2 is transmitted to the rotating sleeve 34, which is perpendicular to the operating shaft 41, by the drive gear 44 and the driven gear 342 that constitute the rotation transmission mechanism 40D. As a result, the rotating sleeve 34 covering the retractable sleeve 35 rotates in the first circumferential direction Dc1. When the rotating sleeve 34 rotates in the first circumferential direction Dc1, the retractable sleeve 35, which has a male thread portion 351m that meshes with the female thread portion 341m of the rotating sleeve 34, moves in the first direction Da. At this time, the retractable sleeve 35 is fixed relative to the valve stem 33 so as not to move in the first circumferential direction Dc1 or the first direction Da. Therefore, the retractable sleeve 35 does not move in the first circumferential direction Dc1 or the first direction Da relative to the valve stem 33, but moves in the first direction Da relative to the second casing portion 10B. The retractable sleeve 35 is also fixed so as not to move relative to the piston 32. Therefore, the piston 32 also moves in the first direction Da together with the retractable sleeve 35. As a result, the valve stem 33 and the valve body 22 move back and forth in the first direction Da together with the piston 32, opening and closing the flow path 10r formed inside the first casing portion 10A. In this way, the valve body 22 can be manually opened and closed by operating the operating member 43 arranged outside the valve casing 10.

[0069] Furthermore, when the retractable sleeve 35 moves a specified amount toward the first side Da1 in the first direction Da, the retractable sleeve 35 abuts against the stopper member 50 fixed to the second casing part 10B. This restricts the movement of not only the retractable sleeve 35 but also the piston 32, the valve stem 33, and the valve body 22 toward the first side Da1 in the first direction Da to the specified amount.

[0070] (Action and effect) In the valve device 2 configured as described above, when the retractable sleeve 35 moves a specified distance toward the first side Da1 in the first direction Da, the retractable sleeve 35 abuts against the stopper member 50 fixed to the second casing portion 10B. This prevents the retractable sleeve 35 from directly contacting the second casing portion 10B. Furthermore, after the retractable sleeve 35 has moved a specified distance toward the first side Da1 in the first direction Da, the retractable sleeve 35 is in contact with the stopper member 50 and is therefore unable to move further toward the first side Da1 in the first direction Da. Therefore, even if the hydraulic pressure in the piston chamber 14a pushes the retractable sleeve 35 toward the first side Da1 in the first direction Da, the retractable sleeve 35 does not move toward the first side Da1 in the first direction Da. This prevents the retractable sleeve 35 from moving in a manner that would cause it to bite into the stopper member 50. This prevents the retractable sleeve 35 and the stopper member 50 from coming into strong contact with each other. As a result, even if the reciprocating sleeve 35 is in contact with the stopper member 50 for a long period of time, the reciprocating sleeve 35 is prevented from adhering to the stopper member 50, and it is possible to stably change the opening degree from a state in which the opening degree has been maintained for a long period of time.

[0071] Furthermore, when the retractable sleeve 35 moves a specified distance toward the first side Da1 in the first direction Da, the tip end surface 35s of the retractable sleeve 35 comes into surface contact with the restricting surface 501 of the stopper member 50 and abuts against it. This ensures a constant contact area between the retractable sleeve 35 and the stopper member 50. This prevents a strong force from being applied to the retractable sleeve 35 and the stopper member 50, as occurs when the contact area between the retractable sleeve 35 and the stopper member 50 is too small. This more effectively prevents the retractable sleeve 35 from sticking.

[0072] Furthermore, when the retractable sleeve 35 is in contact with the restricting surface 501 of the stopper member 50, the interior and exterior of the stopper member 50 communicate in the radial direction Dr via the communicating portion 502. Oil for driving the piston 32 may reach the interior of the stopper member 50 through the gap between the valve stem 33 and the retractable sleeve 35. In such cases, the oil penetrates between the valve stem 33 and the stopper member 50. If the retractable sleeve 35 and the stopper member 50 remain in contact for a long period of time, degraded oil may continue to accumulate between the valve stem 33 and the stopper member 50. As a result, degraded oil may also continue to accumulate between the tip end surface 35s and the restricting surface 501, creating an environment prone to adhesion. However, the communicating portion 502 allows communication between the interior and exterior of the stopper member 50. Therefore, even if the tip end surface 35s and the regulating surface 501 are in contact with each other, the oil remaining inside the stopper member 50 can be discharged to the outside through the communicating portion 502. This makes it possible to more effectively prevent the retractable sleeve 35 from sticking.

[0073] Furthermore, the communication part 502 has a groove 502m, which makes it possible to easily form a structure for discharging oil to the outside of the stopper member 50. Oil that has reached the inside of the stopper member 50 through between the valve stem 33 and the reciprocating sleeve 35 can be smoothly discharged to the outside of the stopper member 50 through the groove 502m extending in the radial direction Dr.

[0074] The stopper member 50 also has a recess 503 recessed from the restriction surface 501 and the inner circumferential surface 50f. This allows oil that reaches the inside of the stopper member 50 through between the valve stem 33 and the reciprocating sleeve 35 to be collected in the recess 503. This prevents oil that has accumulated inside the stopper member 50 from penetrating deep into the first side Da1 in the first direction Da between the valve stem 33 and the stopper member 50. Furthermore, because the recess 503 is connected to the groove 502m, oil that has accumulated in the recess 503 can be quickly discharged to the outside of the stopper member 50.

[0075] Furthermore, when the retractable sleeve 35 and the stopper member 50 are in contact with each other, a gap S is formed between the rotating sleeve 34 and the enlarged diameter portion 352 formed on the retractable sleeve 35. This ensures that the rotating sleeve 34 and the enlarged diameter portion 352 of the retractable sleeve 35, which is immovable in the first circumferential direction Dc1, are always separated in the first direction Da. Therefore, the rotating sleeve 34, which rotates in the first circumferential direction Dc1, and the retractable sleeve 35, which is immovable in the first circumferential direction Dc1, do not come into contact with each other in the first direction Da. This also prevents the rotating sleeve 34 and the retractable sleeve 35 from sticking together. This also makes it possible to stably change the opening degree from a state in which the opening degree has been maintained for a long period of time.

[0076] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure.

[0077] In the above embodiment, the groove 502m is formed as the communicating portion 502, but the configuration of the communicating portion 502 is not limited to this structure. The communicating portion 502 may have, for example, a hole that penetrates the stopper member 50 in the radial direction Dr.

[0078] In the above embodiment, the stopper member 50 is formed integrally with the guide sleeve 51, but the present invention is not limited to this structure. The stopper member 50 may be formed as an independent component separate from the guide sleeve 51. In this case, the stopper member 50 may be fixed to the guide sleeve 51 or to the third wall portion 18.

[0079] In the above embodiment, the valve device 2 drives the valve stem 33 and the piston 32 to be in the closed state when they move to the second side Da2 in the first direction Da, but the structure of the valve device 2 is not limited to this. For example, the valve device 2 may be configured to be in the closed state when the valve stem 33 and the piston 32 move to the first side Da1 in the first direction Da.

[0080] Furthermore, in the valve device 2 of this embodiment, the state in which the stopper member 50 and the retractable sleeve 35 are in contact is considered to be the fully open state, but the specified value for the amount of movement of the retractable sleeve 35 on the stopper member 50 is not limited to being set in this manner. For example, the specified value for the amount of movement of the retractable sleeve 35 may be set so that the state in which the stopper member 50 and the retractable sleeve 35 are in contact is considered to be the fully closed state. Furthermore, the specified value for the amount of movement of the retractable sleeve 35 may be set so that the state in which the stopper member 50 and the retractable sleeve 35 are in contact is any opening between the fully open state and the fully closed state.

[0081] Furthermore, the valve device 2 is not limited to being a stop valve as in this embodiment. The valve device 2 may be, for example, a flow rate adjustment valve that needs to maintain a constant opening for a long period of time.

[0082] <Additional Notes> The valve device 2 described in the embodiment can be understood, for example, as follows.

[0083] (1) A valve device 2 according to a first aspect includes a valve casing 10 having a flow path 10r formed therein through which a fluid flows; a valve body 22 that is movable in a first direction Da within the valve casing 10 and that can open and close the flow path 10r; a piston 32 that is disposed within the valve casing 10 and is hydraulically driven to move in the first direction Da; a valve stem 33 that extends in the first direction Da about a first central axis C1, connects the valve body 22 and the piston 32, and is movable in the first direction Da integrally with the valve body 22 and the piston 32; a rotary sleeve 34 that is rotatably supported in a first circumferential direction Dc1 about the first central axis C1 relative to the valve casing 10, and is disposed on the outer side Dro of the rotary sleeve 34 in the radial direction Dr and is centered on the first central axis C1 relative to the valve casing 10, and is formed in a cylindrical shape so as to cover the valve rod 33; an operating shaft 41 that is disposed on the outer side Dro of the rotary sleeve 34 in the radial direction Dr and is centered on a second central axis C2 and extends in a second direction Db that intersects with the first direction Da; and a rotary sleeve 34 that is fixed to a base end of the operating shaft 41 in the second direction Db outside the valve casing 10 and is rotatably supported in a first circumferential direction Dc1 about the first central axis C1 relative to the valve casing 10, and is rotatably supported in a first circumferential direction Dc1 about the first central axis C1 relative to the valve casing 10, and is rotatably supported in a first circumferential direction Dc1 about the first central axis C2 ... an operating member 43 that rotates the operating shaft 41 in a second circumferential direction Dc2 around the operating shaft 41; a reciprocating sleeve 35 that is formed in a cylindrical shape centered on the first central axis C1 so as to cover the valve stem 33 from an outer side Dro of the radial direction Dr to an inner side Dri of the radial direction Dr with respect to the rotating sleeve 34, and is fixed so as not to be able to move with respect to the valve stem 33 and the piston 32; and a reciprocating sleeve 35 that is fixed to the valve casing 10 at a position close to the valve body 22 in the first direction Da with respect to the reciprocating sleeve 35, and that moves a predetermined amount of the reciprocating sleeve 35 to a first side Da1 in the first direction Da. and a stopper member 50 that limits the rotation of the operating shaft 41 in the second circumferential direction Dc2 to a fixed value, and the operating shaft 41 and the rotating sleeve 34 are connected in a state in which the rotation of the operating shaft 41 in the second circumferential direction Dc2 can be converted into rotation in the first circumferential direction Dc1 and transmitted to the rotating sleeve 34, and the advancing / retracting sleeve 35 can move in the first direction Da when the rotating sleeve 34 rotates in the first circumferential direction Dc1, and the stopper member 50 can come into contact with the advancing / retracting sleeve 35 when the advancing / retracting sleeve 35 moves by the fixed value to the first side Da1 in the first direction Da.

[0084] As a result, when the retractable sleeve 35 moves a specified amount toward the first side Da1 in the first direction Da, the retractable sleeve 35 abuts against the stopper member 50 fixed to the valve casing 10. This prevents the retractable sleeve 35 from directly contacting the valve casing 10. Furthermore, after the retractable sleeve 35 has moved a specified amount toward the first side Da1 in the first direction Da, the retractable sleeve 35 is in contact with the stopper member 50 and is therefore unable to move further toward the first side Da1 in the first direction Da from that position. Therefore, even if the hydraulic pressure in the valve casing 10 presses the retractable sleeve 35 toward the first side Da1 in the first direction Da, the retractable sleeve 35 does not move toward the first side Da1 in the first direction Da. This prevents the retractable sleeve 35 from moving in a way that causes it to bite into the stopper member 50. This prevents the retractable sleeve 35 and the stopper member 50 from coming into strong contact with each other. As a result, even if the reciprocating sleeve 35 is in contact with the stopper member 50 for a long period of time, the reciprocating sleeve 35 is prevented from adhering to the stopper member 50, and it is possible to stably change the opening degree from a state in which the opening degree has been maintained for a long period of time.

[0085] (2) The valve device 2 according to the second aspect is the valve device 2 of (1), wherein the stopper member 50 is formed in a ring shape centered on the first central axis C1 so as to cover the valve rod 33 from the outside Dro of the radial direction Dr, and has a regulating surface 501 facing the piston 32 in the first direction Da and capable of contacting the advancing / retreating sleeve 35.

[0086] As a result, when the retractable sleeve 35 moves by a specified amount to the first side Da1 in the first direction Da, the retractable sleeve 35 comes into surface contact with the regulating surface 501 of the stopper member 50. Therefore, a contact area of ​​a certain size is maintained between the retractable sleeve 35 and the stopper member 50. Therefore, it is possible to prevent a strong force from being applied to the retractable sleeve 35 and the stopper member 50, as would occur if the contact area between the retractable sleeve 35 and the stopper member 50 were too small. This makes it possible to more effectively prevent the retractable sleeve 35 from sticking.

[0087] (3) The valve device 2 according to the third aspect is the valve device 2 of (2), wherein the stopper member 50 further includes a communication portion 502 that connects the inside and the outside in the radial direction Dr when the regulating surface 501 is in contact with the reciprocating sleeve 35.

[0088] Oil for driving the piston 32 may reach the inside of the stopper member 50 through the gap between the valve stem 33 and the retractable sleeve 35. In such cases, the oil penetrates between the valve stem 33 and the stopper member 50. If the retractable sleeve 35 and the stopper member 50 remain in contact for a long period of time, degraded oil may continue to accumulate between the valve stem 33 and the stopper member 50. As a result, degraded oil may also continue to accumulate between the retractable sleeve 35 and the regulating surface 501, creating an environment prone to sticking. However, the formation of the communicating portion 502 establishes communication between the inside and outside of the stopper member 50. Therefore, even if the retractable sleeve 35 and the regulating surface 501 are in contact, oil accumulated inside the stopper member 50 can be discharged to the outside through the communicating portion 502. This more effectively prevents sticking of the retractable sleeve 35.

[0089] (4) The valve device 2 according to a fourth aspect is the valve device 2 of (3), wherein the communication portion 502 has a groove 502m recessed from the restriction surface 501 in the first direction Da and extending in the radial direction Dr.

[0090] This makes it possible to easily form a structure for discharging oil to the outside of the stopper member 50. The oil that reaches the inside of the stopper member 50 through between the valve stem 33 and the reciprocating sleeve 35 can be smoothly discharged to the outside of the stopper member 50 through the groove 502m extending in the radial direction Dr.

[0091] (5) The valve device 2 according to the fifth aspect is any one of the valve devices 2 of (2) to (4), wherein the stopper member 50 has a recess 503 recessed from the regulating surface 501 in the first direction Da and recessed from the inner circumferential surface facing the inward side Dri in the radial direction Dr to the outward side Dro in the radial direction Dr.

[0092] This allows oil that reaches the inside of the stopper member 50 through between the valve stem 33 and the reciprocating sleeve 35 to be collected in the recess 503. This prevents oil that has accumulated inside the stopper member 50 from penetrating deep into the first side Da1 in the first direction Da between the valve stem 33 and the stopper member 50.

[0093] (6) The valve device 2 according to the sixth aspect is any one of the valve devices 2 of (1) to (5), wherein the reciprocating sleeve 35 has an expanded diameter portion 352 that protrudes outward in the radial direction Dr beyond the inner surface of the rotating sleeve 34 at a position closer to the piston 32 in the first direction Da relative to the rotating sleeve 34, and the expanded diameter portion 352 forms a gap S between the reciprocating sleeve 35 and the rotating sleeve 34 in the first direction Da when the reciprocating sleeve 35 and the stopper member 50 are in contact.

[0094] As a result, the rotating sleeve 34 and the retractable sleeve 35, which is immovable in the first circumferential direction Dc1, are always separated in the first direction Da. Therefore, the rotating sleeve 34, which rotates in the first circumferential direction Dc1, and the retractable sleeve 35, which is immovable in the first circumferential direction Dc1, do not come into contact with each other in the first direction Da. This also makes it possible to prevent the rotating sleeve 34 and the retractable sleeve 35 from sticking together. In this respect, it is possible to stably change the opening degree from a state in which the opening degree has been maintained for a long period of time. [Explanation of symbols]

[0095] 1...Steam turbine 2...Valve device 10...Valve casing 10A...First casing section 10B...Second casing part 10C...Third casing section 10r...flow path 11...Valve chest 11a...Inlet side opening 11b...Exit side opening 11t...inside 12...Inlet flow passage section 12a…one end 12b...other end 13...Outlet flow path section 13a…one end 13b...other end 14a...Piston chamber 14b...Gear room 141...First piston chamber 142...Second piston chamber 15...Cylindrical wall 16...First wall part 161...Boss accommodation section 17…Second wall part 17h...Through hole 18…Third wall part 18f...side 18h...Through hole 18m…Storage trench 19...Oil supply and discharge part 19a...Emergency trip cylinder 19b...Drain passage 20...Valve section 21...Valve support 21c...Cylindrical part 22...Valve body 23...Valve seat 24...Strainer 30...Valve drive unit 32...Piston 321...Piston body 322...Boss section 323...First cylindrical section 325…Communication hole 34...Rotating sleeve 341...Second cylindrical part 341m...female thread 342...Driven gear 342g...gear teeth 343...Bearing 35...Advance / retractable sleeve 35s…Tip surface 351...Third cylindrical part 351m…Male thread part 352...Expanded diameter part 36...coil spring 40...Manual operation section 40D...Rotation transmission mechanism 41...Operation axis 42...Support tube 43...Operating member 44...Drive gear 44g...gear teeth 45...Operating section bearing 50...Stopper member 50f…Inner peripheral surface 501...Regulatory aspects 502…Communication part 502m…Ditch 503...recess 51...Guide sleeve 511...Guide section 512...Flange part 100...Turbine body 200...Steam supply source C1…First center axis line C2…Second central axis line Da...first direction Da1...first side (first direction) Da2…Second side (first direction) Db…Second direction Db1…First side (second direction) Db2…Second side (second direction) Dc1…first circumferential direction Dc2…Second circumferential direction Dr…Radial direction Dri…inside Dro...outside S...gap

Claims

1. a valve casing having a flow path formed therein through which a fluid flows; a valve body that is movable in a first direction within the valve casing and that can open and close the flow path; a piston disposed within the valve casing and hydraulically driven to move back and forth in the first direction; a valve rod extending in the first direction around a first central axis, connecting the valve body and the piston, and being movable in the first direction integrally with the valve body and the piston; a rotating sleeve disposed radially outward of the valve stem about the first central axis, the rotating sleeve being cylindrically formed to cover the valve stem, and the rotating sleeve being supported rotatably in a first circumferential direction about the first central axis relative to the valve casing; an operating shaft that is disposed radially outward of the rotary sleeve and that extends in a second direction intersecting the first direction with a second central axis as its center; an operating member fixed to a base end of the operating shaft in the second direction outside the valve casing and configured to rotate the operating shaft in a second circumferential direction about the second central axis; a reciprocating sleeve formed in a cylindrical shape centered on the first central axis so as to cover the valve rod from the radially inner side of the rotating sleeve and from the radially outer side, and fixed so as to be immovable relative to the valve rod and the piston; a stopper member fixed to the valve casing at a position close to the valve body in the first direction relative to the retractable sleeve, the stopper member limiting the amount of movement of the retractable sleeve toward the first side in the first direction to a predetermined specified value, the operating shaft and the rotating sleeve are connected in a state in which rotation of the operating shaft in the second circumferential direction can be converted into rotation in the first circumferential direction and transmitted to the rotating sleeve, the reciprocating sleeve is movable in the first direction when the rotating sleeve rotates in the first circumferential direction, The stopper member is capable of coming into contact with the retractable sleeve when the retractable sleeve moves by the specified amount toward the first side in the first direction.

2. 2. The valve device according to claim 1, wherein the stopper member is formed in an annular shape centered on the first central axis so as to cover the valve rod from the radial outside, and has a regulating surface facing the piston in the first direction and capable of contacting the reciprocating sleeve.

3. The valve device according to claim 2 , wherein the stopper member further comprises a communication portion that communicates the inside with the outside in the radial direction when the regulating surface is in contact with the retractable sleeve.

4. The valve device according to claim 3 , wherein the communication portion has a groove recessed from the restriction surface in the first direction and extending in the radial direction.

5. The valve device according to claim 2 or 3, wherein the stopper member has a recess formed so as to be recessed from the regulating surface in the first direction and recessed from an inner circumferential surface facing inward in the radial direction to an outer side in the radial direction.

6. the reciprocating sleeve has an expanded diameter portion that protrudes radially outward beyond an inner circumferential surface of the rotating sleeve at a position closer to the piston in the first direction relative to the rotating sleeve, The valve device according to claim 1 or 2, wherein the enlarged diameter portion forms a gap between the rotary sleeve and the enlarged diameter portion in the first direction when the reciprocating sleeve and the stopper member are in contact with each other.

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