JPH0771205A - Large-sized valve and assembling-disassembling method thereof - Google Patents

Abstract

PURPOSE:To improve work performance at the time of valve assembling- disassembling time and heighten maintainability. CONSTITUTION:In a main steam separating valve with a valve element fitted in the freely reciprocating state in a valve casing 11 so as to open/close a fluid passage, valve element drive mechanism 14 is fitted to the valve casing 11 through a Grayloc joint 24, removably from a valve cover 58 or the valve casing 11, and a valve element drive mechanism 14 fitting/removing part 22 is provided to connect-support and fit/remove the valve element drive mechanism 14 in relation to the valve cover 58 or the valve casing 11. A valve stem 13 connected to the valve element 12 is connected to the valve element drive mechanism 14 by a valve stem fitting/removing part 19, and an independent removable type gland part 20 slidingly seals a space between the valve cover 58 and the valve stem 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main steam isolation valve used in, for example, a boiling water reactor (BWR), and more particularly, it has a guide for a lightweight and highly rigid valve disc drive mechanism, and a gland part. Also, the present invention relates to a large valve in which workability is improved during periodical inspection of the valve by making the valve body drive mechanism easily removable, and a disassembling / assembling method thereof.

[0002]

2. Description of the Related Art The main steam isolation valve used in a BWR plant will be described below as a typical example of a large valve, but the present application is not limited to this.

Generally, in a BWR plant, as shown in FIG. 22, a reactor pressure vessel 1 is directly connected to a steam turbine 3 via, for example, four main steam pipes 2. In, the first and second main steam isolation valves 5 and 6 are provided in the respective main steam pipes 2. By closing the main steam isolation valves 5 and 6, the reactor pressure vessel 1 can be isolated as needed.

Further, the steam that has worked in the steam turbine 3 is condensed into water in the condenser 7 and becomes condensed water, and the condensed water is returned to the reactor pressure vessel 1 again through the water supply system 8 so as to be supplied. Has become. In FIG. 22, reference numeral 9 is the main steam third
A valve, 10 is a header, and 54 is a Venturi tube.

As shown in FIG. 23, the conventional main steam isolation valves 5 and 6 are connected by interposing an inlet end 11a and an outlet end 11b of a valve box 11 in the middle of each main steam pipe 2. A valve body 12 having a bottomed cylindrical shape is housed in the valve body housing portion 11c of the valve box 11 so as to be reciprocally movable in the axial direction.

The valve rod 13 to which the valve body 12 is connected is arranged in the valve box 11 in a state of being inclined forward by 45 ° with respect to the inflow direction of the main steam shown by the arrow in the figure, and We are trying to reduce it.

The valve rod 13 is connected to the air cylinder 14a via a coupling 14e, a spring seat 14d and an oil cylinder 14b, and reciprocates the valve body 12 in its axial direction to open and close the fluid passage. There is.

The air cylinder 14a is supported by four yoke rods 18 fixed on a valve lid 17, and the valve rod 13
The linearity of the sliding direction is secured. Coupling 14e
Is connected to the spring seat 14d receiving the repulsive force of the external spring 14c, so that the valve body 12 can be operated in the closing direction by the spring force.

When the valve body 12 is seated on the valve seat 16, the fluid passage is fully closed, and when the valve body 12 is lifted above it, the fluid passage is fully opened. The arrow in the figure indicates the flow direction of the fluid, and the reference numeral 15 is an inlet guide rib provided in the valve box 11.

[0010]

In the conventional main steam isolation valves 5 and 6 as described above, the disassembling / assembling work at the time of the periodic inspection is a complicated work requiring skill because of the structure of the valve, and therefore the work amount. There is a problem in that (the number of workers / time) is increased and the workers are burdened.

Particularly, when disassembling the sliding seal portion (gland portion) of the valve rod 13 and the valve lid 17, the work is performed on the valve lid 17, but on the valve lid 17, the upper valve body drive Since the four yoke rods 18 for the mechanism 14 are fixed, the working space is narrow,
Moreover, there is a problem that the work becomes difficult.

Further, since disassembling the gland part is a work of contacting the reactor water, it is necessary to attach a pollution protection tool,
Furthermore, the workability becomes extremely poor. In order to improve such a difficult work, it is possible to introduce an automated device, but there is still a problem that the introduction is difficult because the work space is narrow.

For this reason, in the main steam isolation valve,
It was desired to have a valve structure that facilitates disassembly and assembly during regular inspections.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is a large-sized valve having a structure which is easy to perform and can improve workability when disassembling and assembling the valve, and which has excellent maintainability. And to provide a method of disassembling and assembling the same.

[0015]

The present invention is configured as follows in order to solve the above-mentioned problems.

The invention according to claim 1 (hereinafter referred to as the first invention) is a large-sized valve in which a valve body for opening and closing a fluid passage is reciprocally mounted in a valve box, and a fixed seal is provided on the valve box. Valve lid fixed via the valve portion, a valve body drive mechanism detachably attached to the valve lid or the valve box, and the valve lid or valve box and the valve body drive mechanism are connected and supported and are removed. A valve body drive mechanism attachment / detachment section for connecting the valve body connected to the valve body to the valve body drive mechanism;
It is characterized by comprising a gland portion for slidingly sealing between the valve lid and the valve rod.

According to a second aspect of the present invention (hereinafter referred to as the second aspect of the invention), an arbitrary number of yoke rods are provided for fixing the valve body drive mechanism on the valve lid and guiding the opening / closing operation of the valve body. A yoke rod attaching / detaching portion provided at the lower end of the yoke rod, a yoke rod fixing portion fixed to the valve lid, and a connecting portion connecting and disconnecting the yoke rod attaching / detaching portion and the yoke rod fixing portion. Is characterized by.

According to a third aspect of the invention (hereinafter referred to as the third aspect), the valve body drive mechanism is fixed on the valve lid, and
It shall consist of a guide part of arbitrary shape that guides the opening and closing operation of the valve body, a flange part arranged at the lower end of this guide part, and a flange fixing part for fixing and removing this flange part to the valve lid. Is characterized by.

According to a fourth aspect of the present invention (hereinafter referred to as the fourth aspect), in the valve lid, there is provided a flange guide portion for connecting the flange portions, and a positioning and aligning portion for positioning and aligning. The flange portion is engaged with the flange guide portion on the valve lid to be guided when fixed, and is rotationally supported to incline the valve body drive mechanism,
It is characterized by being configured with a guide / hinge portion that prevents the flange from falling until it is completely fixed.

According to a fifth aspect of the invention (hereinafter referred to as the fifth invention), a valve lid fixed to the valve box via a fixed seal portion, and further fixed to the valve lid via a fixed seal portion. And a detachable gland that slides and seals between the valve stem and the valve stem, a valve disc drive mechanism fixed on the valve lid or the valve box, and a valve disc drive the valve disc connected to the valve disc. It is characterized in that it is composed of a valve stem connecting portion connected to the mechanism.

The invention according to claim 6 (hereinafter referred to as the sixth invention) includes a valve stem sleeve fixed to the outer periphery of a valve stem connected to a valve body via a fixed seal portion, and the valve box. A valve lid fixed via a fixed seal portion, an independent detachable gland portion fixed to the valve lid via the fixed seal portion and slidingly sealing between the valve stem sleeve,
It is characterized by comprising a valve body driving mechanism fixed on the valve lid or the valve box, and a valve rod connecting portion connecting the valve rod to the valve body driving mechanism.

The invention according to claim 7 (hereinafter referred to as the seventh invention) is a valve lid fixed to the valve box via a fixed seal portion, and a valve body fixedly installed in the valve lid or the valve box. A drive mechanism; a valve rod detachable portion provided on the valve body drive mechanism side and the valve rod side for easily connecting and disconnecting the valve rod connected to the valve body and the valve body drive mechanism; and the valve lid. And a gland portion for slidingly sealing between the valve rod and the valve rod.

According to an eighth aspect of the present invention (hereinafter referred to as an eighth aspect), the valve rod attaching / detaching portion is attached to a lower portion of the valve body drive mechanism by a friction bush fixing portion, and a tightening force is applied to an inner cylindrical surface thereof. And a valve bush friction fixing portion having a cylindrical friction surface that is provided on the upper portion of the valve bush and that is coupled to the cylindrical surface inside the friction bush. It is characterized in that the valve rod and the valve body drive mechanism are detached from each other by applying and releasing a tightening force, that is, a frictional force to the fixed portion.

According to a ninth aspect of the present invention (hereinafter referred to as the ninth aspect), the valve rod attaching / detaching portion is a boss screw portion provided on the lower portion of the drive plate of the valve body drive mechanism and a screw portion on the upper portion of the valve rod. It consists of a cylindrical nut attached to the valve, a detachable nut that is attached to the valve rod and is attached to the boss screw under the drive plate while sandwiching the cylindrical nut, and a detent nut to prevent the detachable nut from rotating. It is characterized in that the valve rod and the valve body drive mechanism are detached by attaching and detaching the detachable nut to the boss screw portion.

According to a tenth aspect of the present invention (hereinafter referred to as a tenth aspect), the valve rod attaching / detaching portion is fixed to a lower portion of a drive plate of a valve body drive mechanism, and an internal ball portion is arranged in a radial direction of the valve rod. Consists of a lens attaching / detaching part having a driving part for moving, and a fixing groove provided on the valve rod upper part and having a groove shaped to be combined with the lens attaching / detaching part, and combining the lens attaching / detaching part and the fixing groove. It is characterized in that the valve rod and the valve body drive mechanism are detached by detaching.

According to an eleventh aspect of the present invention (hereinafter referred to as the eleventh aspect), the valve stem attachment / detachment portion is fixed to a lower portion of a drive plate of a valve body drive mechanism, and the drive portion and the drive portion allow a radial direction of the valve stem. The chuck type attaching / detaching portion having a chuck portion that moves to the bottom, and the fixing groove portion provided on the upper portion of the valve rod and having a groove shaped to be combined with the chuck type fixing portion. It is characterized in that the valve rod and the valve body drive mechanism are detached by detaching.

According to a twelfth aspect of the present invention (hereinafter referred to as the twelfth aspect), a valve lid fixed to the valve box via a fixed seal portion, and a valve lid or a valve box detachably attached to the valve lid. A valve body drive mechanism, a valve body drive mechanism attaching / detaching portion for connecting and supporting the valve lid or the valve box and the valve body drive mechanism, and detaching the valve body drive mechanism, and a valve rod and a valve body drive mechanism connected to the valve body. A valve stem attachment / detachment portion provided on the valve body drive mechanism side and the valve stem side for easy connection and disconnection, and a gland portion slidingly sealing between the valve lid and the valve stem. To do.

According to a thirteenth aspect of the present invention (hereinafter referred to as the thirteenth aspect), a valve lid fixed to the valve box via a fixed seal portion and a valve lid fixed to the valve lid via the fixed seal portion. And a detachable gland for slidingly sealing the valve stem, a valve element drive mechanism detachably attached to the valve lid or the valve box, and the valve lid or the valve box and the valve element drive It is characterized by comprising a valve body drive mechanism attaching / detaching portion for connecting and supporting the mechanism and for attaching / detaching, and a valve rod connecting portion for connecting a valve rod connected to the valve body to the valve body drive mechanism.

According to a fourteenth aspect of the present invention (hereinafter referred to as the fourteenth aspect), a valve lid fixed to the valve box via a fixed seal portion and a valve lid fixed to the valve lid via the fixed seal portion. And a detachable gland for slidingly sealing the valve stem, a valve element drive mechanism detachably attached to the valve lid or the valve box, and the valve lid or the valve box and the valve element drive A valve body drive mechanism attaching / detaching portion for connecting / supporting and detaching the mechanism, and a valve body drive mechanism side and a valve rod for easily connecting / disconnecting the valve rod and the valve body drive mechanism connected to the valve body. It is characterized in that it is composed of a valve stem detaching portion provided on the side.

According to a fifteenth aspect of the present invention (hereinafter referred to as the fifteenth aspect), in a method for disassembling and assembling a large valve, the entire valve box is brought into contact with the valve body in the valve box against the valve lid during disassembly work. It is characterized in that each constituent part is disassembled after that, and each constituent part is assembled at the time of assembling, and then the valve body is attached to the valve lid and combined with the valve box.

According to a sixteenth aspect of the present invention (hereinafter referred to as the sixteenth aspect), in the disassembling / assembling method of a large valve, the disassembling work is performed by sequentially removing the valve rod from the valve body drive mechanism and the valve. The work of removing the body drive mechanism from the valve lid, the work of removing the independent detachable gland from the valve lid, the work of removing the valve lid from the valve housing, and the work of removing the valve body and valve stem from the valve housing are performed. It is characterized in that the operation is performed in reverse order when disassembling the large valve at the time of assembly.

According to a seventeenth aspect of the present invention (hereinafter referred to as the seventeenth aspect), in the method for disassembling and assembling a large valve, at the time of disassembling the valve, first, the valve body is fixed and held to the valve lid. The components other than the valve box are taken out together with, and then each component is disassembled.When assembling the valve, insert the valve body and the valve stem into the valve box, and then the valve cover to the valve box. And the independent detachable gland part to the valve lid, the valve body drive mechanism to the valve lid, and the valve rod to the valve body drive mechanism. To do.

According to the eighteenth aspect of the present invention (hereinafter referred to as the eighteenth aspect of the invention), when the valve is disassembled, the valve rod is removed from the valve disc drive mechanism and the valve disc of the valve disc drive mechanism is sequentially removed. Removal work, removal work from the valve lid of the independent removal type gland, removal work of the valve lid from the valve box, and removal work of the valve body and valve stem from the valve box are carried out. Each component is assembled, and then the components other than the valve box are collectively attached to the valve box with the valve body fixed and held to the valve lid.

[0034]

[Action]

(First Invention) When the work is performed on the valve lid, the valve body drive mechanism detaching portion separates the valve body drive mechanism from the valve lid.
As a result, the work space on the valve lid is widened and workability is improved. Further, it becomes easy to attach various types of automation equipment for work. Further, since the valve body drive mechanism and the valve lid are separated, the handling of each is improved.

(Second Invention) When the valve body drive mechanism is removed from the valve lid, the four yoke rod fixing portions fixed to the valve lid and the yoke rod attaching / detaching portion provided at the end of the yoke rod are provided. , The connection is separated by disassembling it. Thereafter, the valve disc drive mechanism is lifted by a lifting device such as a chain block, and the yoke rod attaching / detaching part is removed from the yoke rod fixing part.

In this way, by separating the valve body drive mechanism from the valve lid, it is possible to secure a space for various operations on the valve lid. Also, when automating various tasks,
Since the valve body drive mechanism and the valve lid are separated, the handling of each is improved.

(Third invention) The valve lid and the guide for fixing and supporting the valve body drive mechanism are fixed by a flange-shaped connecting portion. In this way, when the valve body drive mechanism is removed from the valve lid, the contact portion between the valve lid and the flange is a flat surface, so there is no sliding portion when disconnecting and connecting. It can be separated from the valve lid simply by lifting it up. Therefore, unlike the conventional case, it is not necessary to accurately lift it obliquely upward, and the disassembling and assembling work can be simplified.

Further, by separating the valve body drive mechanism from above the valve lid, it is possible to secure a space for various work on the valve lid and improve workability. Further, in the case of automating various operations, since the valve body drive mechanism and the valve lid are separated, various operation devices can be easily installed and workability is improved.

(Fourth Invention) When connecting the valve body drive mechanism to a tilted valve lid by a lifting device such as a chain block, the flange is guided to the valve lid for positioning. It is necessary to align the core and fix it while preventing it from falling.

For this purpose, first, the guide / hinge portion of the flange is gradually lowered onto the flange guide provided on the valve lid to bring them into contact with each other. Then, by tilting the base of the flange guide on the valve lid as the center, the axis of the valve stem and the valve body drive mechanism are aligned. At this time, accurate positioning / alignment is performed by the positioning / alignment portion on the valve lid.

Further, since the guide / hinge portion on the flange side and the flange guide on the valve lid side are engaged with each other when tilted, the valve body drive mechanism does not fall down even if it is fixed, so until the flange is completely fixed. Can be held.

Therefore, it is possible to perform guidance, positioning, and fall prevention when fixing the valve body drive mechanism to the valve lid by using only a lifting device such as a chain block without using a special work auxiliary device. Fixed work can be done.

(Fifth Invention) When disassembling the gland part in a periodic inspection or the like, first, the fixing part of the independently detachable gland part to the valve lid is removed, and the gland pressing part is disassembled.

After that, the valve stem is pulled upwards by human power or by using a lifting device such as a chain block for the independently removable gland portion. Thereby, the valve lid and the independent removable gland portion can be separated.

As described above, first, the small detachable gland which is easy to handle is detached from the valve lid,
In the subsequent valve lid removing work, contact between the central portion of the valve lid and the sliding seal surface of the valve rod can be prevented, and workability can be improved.

The ground part can be carried to an arbitrary work space and can be disassembled in a workable state. If the sliding seal surface of the gland is scratched,
Even if repair is required, it is easy to handle, and in some cases the independent removable gland can be replaced, improving maintainability.

(Sixth Invention) When disassembling the gland portion in a periodic inspection or the like, first, the connecting portion between the valve rod and the valve disc drive mechanism is separated, and the valve disc drive mechanism is also separated and removed from the valve lid. Next, the fixing portion of the independently removable gland portion to the valve lid is removed.

After that, the valve stem is pulled up by hand using an independent detachable gland portion or by using a lifting device such as a chain block. At this time, since the valve stem sleeve is disengaged from the valve stem, the independent removal-type gland part can be collectively removed from the valve lid together with the gland and the valve stem sleeve without disassembling the gland pressing part.

(Seventh Invention) In disassembling and assembling such as periodic inspection, the valve body drive mechanism and the valve stem are provided by the valve stem detaching part attached to the valve disc drive mechanism and the valve stem detaching part provided on the valve stem. Desorption. Since the valve rod attaching / detaching portion can connect and disconnect the valve rod and the valve body drive mechanism more easily than in the case where the flange is simply coupled, the workability is improved.

(Eighth Invention) At the time of disassembling for regular inspection or the like, first, the tightening portion (a hydraulic pressure screw, a mechanical pressure screw, etc.) that generates a tightening force on the friction bush is loosened. As a result, the friction bush and the valve rod friction fixing portion having a cylindrical surface provided on the upper portion of the valve rod are separated,
The valve stem can be separated from the valve body drive.

As described above, since the valve rod and the valve body drive mechanism can be separated and joined only by generating and releasing the tightening force, workability is improved.

(Ninth Invention) At the time of disassembling at the time of periodic inspection, first, the detent nut on the upper portion of the valve rod is removed, and then the upper portion of the valve rod attached to the boss screw portion provided on the lower portion of the valve body drive mechanism. Remove the removable nut. Thereby, the valve rod and the valve body drive mechanism can be separated.

In this way, the valve rod and the valve body drive mechanism can be separated and joined by simply removing the two detent nuts and the detachable nuts, thus improving workability.

(Tenth Invention) At the time of disassembling at the time of periodic inspection, first, the balls inside the lens-shaped attaching / detaching portion fixed to the lower portion of the valve body drive mechanism are removed from the fixing groove portion provided on the upper portion of the valve rod. In this way, the driving force (hydraulic pressure, pneumatic pressure, mechanical force, etc.) of the driving unit is applied. This allows the valve stem to be separated from the valve body drive unit.

As described above, since the valve rod and the valve body drive mechanism can be separated and joined by merely applying the driving force for removing the balls of the target lens detaching / attaching portion, the workability is improved.

(Eleventh Invention) When disassembling at a time of periodic inspection, first, the chuck of the chuck type attaching / detaching portion fixed to the lower portion of the valve body drive mechanism is removed from the fixing groove portion provided on the upper portion of the valve rod. The drive force (hydraulic pressure, air pressure, mechanical force, etc.) of the drive unit is applied. This allows the valve stem to be separated from the valve body drive unit.

As described above, since the valve rod and the valve body drive mechanism can be separated and coupled only by applying the driving force for removing the chuck of the chuck type attaching / detaching portion, the workability is improved.

(Twelfth Invention) At the time of disassembling such as at the time of periodic inspection, first, the valve rod attaching / detaching portion attached to the valve body drive mechanism and the valve rod attaching / detaching portion provided on the valve rod are separated. Next, the valve body drive mechanism attaching / detaching portion is separated, and the valve body drive mechanism is separated from the valve lid.

This makes it possible to smoothly perform a series of operations for attaching and detaching the valve rod to the valve body drive section and attaching and detaching the valve body drive section to the valve lid, thus improving workability.

(Thirteenth Invention) At the time of disassembling at the time of periodic inspection, first, the valve rod is removed from the valve rod connecting portion under the drive plate of the valve body drive mechanism. Next, the valve body drive mechanism attaching / detaching portion is separated, and the valve body drive mechanism is separated from the valve lid. Then, the independently removable gland is removed from the valve lid.

As a result, the independent detachable gland can be attached to and removed from the valve lid in a wide working space where the valve body drive mechanism is not on the valve lid, thus improving workability.

(Fourteenth Invention) At the time of disassembling at the time of periodic inspection, first, the valve body drive mechanism and the valve rod are attached by the valve rod attaching / detaching portion attached to the valve body drive mechanism and the valve rod attaching / detaching portion provided on the valve rod. To separate. Next, the valve body drive mechanism detachment section separates the valve body drive mechanism from the valve lid. Further, the independently removable gland portion is removed from the valve lid.

This makes it possible to smoothly perform a series of operations such as attachment / detachment of the valve body drive mechanism on the valve lid and attachment / detachment of the independent detachable gland to the valve lid, thus improving workability.

(Fifteenth Invention) When disassembling the main steam isolation valve, the valve body in the valve box is applied to the valve lid without removing the valve body drive mechanism, the valve lid, the valve body and the valve rod individually. Remove all from the valve box in a batch. Then, each component is disassembled at another place. According to such a disassembling method, the amount of work is reduced and the work at the valve installation place where the radiation dose is high is reduced, so that the exposure dose can be reduced.

Further, since the constituent parts can be disassembled vertically in a wide working place, the workability can be improved and the working amount can be reduced. Further, at the time of assembly, the respective constituent parts are assembled in the reverse order, the valve body is attached to the valve lid, and the assembled together in the valve box. At this time, the same effect can be obtained.

(Sixteenth Invention) When disassembling at the time of periodical inspection, the valve stem is sequentially removed from the valve body drive mechanism, the valve body drive mechanism is removed from the valve lid, and the independent detachable gland portion is removed from the valve lid. The valve lid is removed from the valve box, and the disc pair and valve stem are removed from the valve box. This improves workability and reduces the burden on the worker.

(Seventeenth Invention) When disassembling at the time of periodic inspection, first, the components other than the valve box are collectively taken out in a state where the valve body in the valve box is fixed and held by abutting against the valve lid. , And then disassemble each component. During assembly, the valve body and valve stem are inserted into the valve box, the valve lid is attached to the valve box, the independent removable gland is attached to the valve lid, and the valve element drive mechanism is installed. Installation work to the valve lid of
Work to attach the valve stem to the valve body drive mechanism. This improves workability and reduces the burden on the worker.

(Eighteenth invention) When disassembling at the time of periodic inspection, the work of removing the valve rod from the valve body drive mechanism is carried out in sequence.
Removal work of valve disc drive mechanism from valve lid, detachment work of independent detachable gland from valve lid, removal work of valve lid from valve box, and removal of valve body and valve stem from valve box Carry out.

At the time of assembling, first, each component is assembled, and then the valve body is fixed to the valve lid, for example.
While holding it, attach all the components except the valve box to the valve box together. This improves workability and reduces the burden on the worker.

[0070]

Embodiments Embodiments of the large-sized valve according to the first to fifteenth inventions of the present application will be generally described with reference to FIGS. In each figure, the same parts as those in FIG. 23 are designated by the same reference numerals, and the description of the overlapping parts will be omitted. Further, the main steam isolation valve will be described as a representative example of the large valve, but the present invention is not limited to this valve.

FIG. 1 (a) is a longitudinal sectional view showing a partial side view of a large valve used in a unified manner in the first to fifteenth embodiments of the present invention. A front view seen from AA,
The same (c) is a sectional view taken along the line AA of (a).

In FIG. 1A, the air cylinder 14a and the oil cylinder 14b for driving the valve rod 13 are supported by the valve lid 58 via the cylindrical guide 21.

The lower end of the cylindrical guide 21 is in contact with the valve lid 58 at the valve body drive mechanism attaching / detaching portion 22, and is fixed by bolting or the like.
It is fixed by 23 and is detachable from the valve lid 58. An air cylinder 14a is connected to the upper end of the cylindrical guide 21.

The driving force of the air cylinder 14a is transmitted from the shaft 55 of the oil cylinder 14b to the valve rod 13 via the spring seat 14d and the valve rod attaching / detaching portion 19, and the valve body 12 (not shown) is driven. In addition, the valve stem attaching / detaching part 19 has an external spring 14
Since it is connected to the spring seat 14d receiving the repulsive force of c, the valve body 12 can be operated in the closing direction by the spring force.

By supporting the valve lid 58 and the guide of the valve body drive mechanism 14 by the cylindrical member, it is possible to obtain a lightweight and highly rigid guide, which improves the handleability, the strength, and the earthquake resistance. be able to.

The valve rod is provided in the through hole through which the valve rod 13 of the valve lid 58 passes.
An independent detachable gland portion 20 for slidingly sealing 13 is provided and can be detached from the valve lid 58. Further, the valve lid 58 is connected and fixed to the valve box 11 via the gray lock 24, and can be easily separated.

Now, the gray lock 24 will be described. The gray lock 24 is a half-crack ring-shaped fixture having a V-shaped taper groove on the inner surface as shown in FIG.
The two half-split rings are used facing each other and tightened with the nut 25 and the through bolt 26.

Due to the V-shaped taper groove, a force in the close contact direction acts on the flange-shaped convex portion provided on the valve lid 58 and the flange at the end of the cylindrical guide 21 to fix them. As a result, the connection strength is high and the fixing can be performed with high reliability, and since the number of screws used for tightening is small, mounting and removal can be easily performed.

To detect the position of the valve lid 58, as shown in FIG. 1C, the plate 28 is fixed to the spring seat 14d, and the non-contact position detection such as magnetic type or optical type is performed on the inoperative cylinder guide 21. This is done by installing the device 27. The spring seat 14d moves up and down and the plate 28 moves according to the operation of the valve body 12.

Then, the non-contact position detector 27 is installed at a position on the cylindrical guide 21 corresponding to the position of the valve lid 58 to be detected, and a signal is generated when the plate 28 enters the detection range and the position is detected. Can be detected. Since the detection is performed in a non-contact manner, it is possible to prevent the detection section from becoming undetectable due to mechanical deformation or damage, and to improve the detection reliability.

FIG. 2 shows the valve body drive mechanism 14 and the valve lid in FIG.
It is a longitudinal cross-sectional view which shows the structure of the Example of 6th invention which expanded the relationship with 58. In FIG. 2, an independent detachable gland portion 59 is inserted into a central through hole of the valve lid 58, and is attached to the upper surface of the valve lid 58 by a mounting bolt 64. Valve lid
A fixed seal 60 seals between the 58 and the independent removable gland 59.

On the other hand, a valve rod sleeve 61 is attached to the valve rod 13. A space between the valve stem 13 and the valve stem sleeve 61 is sealed by a fixed seal 62 attached to a groove portion below the valve stem sleeve 61. A gland 63 slidably seals between the valve stem sleeve 61 and the independent detachable gland portion 59. The gland 63 is fixed by a gland presser 65.

A fixing cylindrical nut 66 is attached to the threaded portion on the upper end of the valve rod 13. The cylindrical nut 66 is fixed by a friction bush 67 to a drive plate 69 that transmits a drive force of a drive unit (not shown) via a mounting portion 68.

In order to press the valve rod sleeve 61 against the mounting portion 68, a pressing nut 70 is attached to the threaded portion at the upper end of the valve rod sleeve 61. In addition, a rotation stop nut 71 is attached to prevent the pressing nut 70 from rotating.

FIG. 3 is a longitudinal sectional view showing an enlarged view of the upper portion of the valve rod 13 of FIG. 2, and also serves as a view showing a detachable portion of the valve rod 13 of the eighth embodiment of the invention. 2 and 3, reference numeral 92 is a backup fixed seal, 93 is a fixed seal holder, and 94 is a detent nut for the cylindrical nut 66.

FIG. 4 is a longitudinal sectional view schematically showing a modified example of the detachable portion of the valve rod 13 of the eighth invention. In FIG. 4, the drive plate 69 is provided with a boss portion 75. A friction bush 67 is attached to the boss portion 75. Valve rod 13
Has a cylindrical surface having no threaded portion.

FIG. 5 is a vertical sectional view showing a detachable portion of the valve rod 13 according to the ninth embodiment of the invention. In FIG. 5, a fixing cylindrical nut 66 is screwed and attached to the threaded portion formed on the upper end of the valve rod 13. A drive plate 69 that transmits the driving force of a drive unit (not shown) is provided with a boss portion 75 having a threaded portion on the outer circumference.

A detachable nut 76 is attached to the boss portion 75 with the fixing cylindrical nut 66 sandwiched therebetween. A positioning pin 77 is attached for positioning the fixing cylindrical nut 66 with respect to the boss portion 75. Further, a detent nut 71 is attached to the threaded portion of the valve rod 13 for detenting the detachable nut 76.

FIG. 6 is a vertical sectional view showing a detachable portion of the valve rod 13 of the embodiment of the tenth invention. In FIG. 6, a target lens attaching / detaching portion 78 is fixed to the drive plate 69 by bolts or the like not shown.

Inside the lens attaching / detaching part 78, an arbitrary number of spherical ball parts 79, a ball holding part 80 for holding each of these ball parts 79 on the circumference so as to be able to be taken in and out, and moved up and down by air pressure, A movable sleeve 81 for inserting and removing the balls 79 into and from the ball holding portion 80 and a spring 82 for pressing the movable sleeve 81 downward are provided.

An O-ring 83 is attached to a portion of the target lens attaching / detaching portion 78 to which air pressure is applied. Target attachment / detachment
Two air pressure supply ports 84a, 84b for supplying air pressure for moving the movable sleeve 81 upward and downward are provided on the 78.
It is provided in some places. At the upper part of the valve rod 13, there is a lens desorption part 78.
A fixing groove portion 85 having a shape into which the inner ball portion 79 is fitted is provided.

FIG. 7 is a vertical sectional view showing a modification of the tenth invention. In FIG. 7, the lens holding unit 80 inside the lens attaching / detaching unit 78.
Holds the balls 79 in a plurality of stages. Further, in the upper part of the valve rod 13, similarly, a plurality of fixing groove portions 85 are provided.

FIG. 8 is a vertical sectional view showing a detachable portion of the valve rod 13 of the eleventh invention. In FIG. 8, a chuck type attaching / detaching portion 86 is fixed to a drive plate 69 (not shown) by a bolt (not shown) or the like. A chuck part 87 is attached to the chuck type detachable part 86 so as to be openable and closable.

Further, as the driving force for opening and closing the chuck portion 87, for example, air pressure is supplied by the driving force supply portion 88. Further, a fixing groove portion 85, which is a portion to be gripped by the chuck portion 87, is provided on the upper portion of the valve rod 13.

FIG. 9 is a vertical sectional view showing the structure of the embodiment of the second invention. In FIG. 9, a yoke rod fixing portion 89 is fixed on the valve lid 58. This yoke rod fixing part
89 includes a yoke rod attaching / detaching portion 90 at the lower end of the yoke rod 18.
Is inset. The yoke rod fixing portion 89 and the yoke rod attaching / detaching portion 90 are connected to each other by a connecting portion 91 by using screw portions provided respectively.

Next, the operation, disassembly and assembly method of each part of the main steam isolation valves 5 and 6 having the above construction will be described below. In FIG. 2, the valve disc drive mechanism 14 is fixed on the valve lid 58 by stud bolts and nuts (not shown). This makes it possible to remove the valve body drive mechanism 14 from the valve lid 58.

The valve body drive mechanism 14 is configured to drive the drive plate 69 in the direction of the valve rod 13 by the drive force of a drive unit (not shown) and the force of the external spring 14c. This drive plate 69
Also serves as a guide for maintaining linearity in the driving direction.

A friction bush 67 is attached to the lower portion of the drive plate 69 by a friction bush attachment portion 68 with a bolt (not shown) or the like. The friction bush 67 is provided with a tightening portion (not shown), and by generating and releasing a force such as mechanical force, hydraulic pressure, or air pressure in this tightening portion, the friction bush 67 is tightened on the inner cylindrical surface. It is designed to generate and release urging force. Due to this tightening force, the valve rod 13 and the valve body drive mechanism 14
The sides can be connected and disconnected.

A valve rod sleeve 61 is attached to the outside of the valve rod 13. Between the valve stem sleeve 61 and the valve stem 13,
It is sealed by a fixed seal 62. This valve stem sleeve 61
Has a length greater than the movable distance of the valve body 12, and the valve rod 13
Instead, a sliding seal is made with the valve lid 58. With this, the load due to the frictional force of the sliding seal is not applied to the valve rod 13,
Further, for example, when the seal surface is damaged, the valve stem sleeve 61 can be removed and repaired, or the valve stem sleeve 61 can be replaced together.

A cylindrical nut 66 is attached to the threaded portion on the upper portion of the valve rod 13.
Is attached. The cylindrical surface of the cylindrical nut 66 is fixed by the friction bush 67.

A threaded portion is provided above the valve stem sleeve 61, and a pressing nut 70 and a detent nut 71 are attached. The pressing nut 70 is fixed so as to press the lower surface of the friction bush mounting portion 68 with the cylindrical nut 66 fixed to the friction bush 67. This makes it possible to press the valve stem sleeve 61 below the valve stem 13 and crush the fixed seal 62. Further, when the drive unit (not shown) pushes down the drive plate 69 by the emergency closing operation, it is necessary to transmit a large drive force to the valve rod 13, but the lower surface of the friction bush mounting portion 68 presses the upper surface of the pressing nut 70 to force the force. Is transmitted to the valve stem sleeve 61 and further transmitted to the valve stem 13.

Therefore, the friction bush 67 itself can transmit the force to the valve rod 13 without receiving a large force. Non-rotating nut 71 is a pressing nut 70
To prevent loosening.

In such a mounting structure of the valve rod 13 to the valve body drive mechanism 14, in order to adjust the moving range of the valve body 12 not shown, only the mounting position of the cylindrical nut 66 to the friction bush 67 is changed. Can be adjusted easily.

On the valve lid 58, an independently removable gland 59 is attached by a mounting bolt 64 via a fixed seal 60. The valve lid is attached to the independent detachable gland 59.
A push-up portion 56, which is a female screw portion for facilitating the removal from 58, is provided, and the independent removal-type gland portion 59 can be pushed up by a bolt.

Independent detachable gland 59 and valve stem sleeve
A gland 63 that performs a sliding seal is attached between 61. A gland presser 65 that pressurizes the gland 63 is attached to the upper part of the gland 63. The gland presser 65 has a structure in which the disc springs 57 are pressed against each other, and the sealing performance can be maintained even if the gland 63 is deformed due to friction loss, heat loss, or the like.

When disassembling the large-sized valve having such a structure, that is, the main steam isolation valve for periodic inspection and the like, first, in the closed state of the main steam isolation valve, the valve rod 13 is separated from the valve body drive mechanism 14. . That is, by releasing the tightening force of the friction bush 67, the cylindrical nut 66 attached to the threaded portion above the valve rod 13 is separated.

The generation of this tightening force is as shown in FIG.
For example, by tightening one pressure bolt 72, the oil 74 contained in the thin portion 73 on the inner surface of the friction bush 67
Can be achieved by inflating the thin-walled portion 73 by pressing.

This friction bush 67 is fixed by a method in which the valve rod 13 has a cylindrical upper portion as shown in FIG.
Alternatively, the valve rod 13 may be directly fixed. Although not shown, the pressurization may be pneumatic pressure or mechanical pressing force instead of hydraulic pressure.

The valve rod 13 and the valve body drive mechanism in the ninth invention
FIG. 5 shows an example of the structure in which 14 is attached and detached. In this configuration, a boss 75 having a threaded portion on the outer periphery is provided below the drive plate 69. On the other hand, on the valve rod 13 side, a fixing cylindrical nut 66, a detachment nut 76, and a rotation-stop nut 71 are attached to the upper threaded portion.By attaching and detaching the detachment nut 76 to the boss portion 75, the valve The rod 13 can be detached from the valve body drive mechanism 14. The rotation stopper of the fixing cylindrical nut 66 is, for example, a positioning pin provided between it and the boss portion 75.
77.

In such a construction, the fastening is done with the detachable nut 76.
Since it is performed only on the screw part of, the number of parts is small,
It is possible to provide a relatively reliable desorption part. Also,
The overall shape can also be made smaller.

The valve rod 13 and the valve body drive mechanism in the tenth invention
FIG. 6 shows a structure for attaching and detaching 14. In this configuration, the drive plate
A lens attaching / detaching portion 78 is fixed to the lower portion of 69. On the other hand, valve stem
At the upper part of 13, the fixing groove 85 that can be connected to the target lens detaching part 78
Is provided. The fixed groove 85 is formed by the valve rod 13
It is also possible to increase the outer diameter and improve the strength by attaching the cylindrical nut having the fixing groove portion 85 to the threaded portion at the upper portion.

With this configuration, when the valve rod 13 is connected to the target lens detaching / attaching portion, air pressure is applied to the air pressure supply port 84a below the target lens attaching / detaching portion 78 by an air pressure source (not shown) so that the inner movable sleeve 81 is attached. , The spring 82 is pushed up and moved upward.
At this time, the air pressure is sealed by the O-ring 83.

In this state, the fixing groove 85 on the upper portion of the valve rod 13
Is inserted into the hole 78a at the center of the target lens detaching / attaching portion 78. At this time, the inner diameter of the lower portion of the movable sleeve 81 is larger than that of the upper portion, and the ball portion 79 held by the ball holding portion 80 escapes, so that the tip of the valve rod 13 can pass through the ball portion 79.

Next, air pressure is supplied from the upper air pressure supply port 84b to push down the movable sleeve 81. Alternatively, by releasing the air pressure of the lower air pressure supply port 84a,
It may be pushed down only by the force of the spring 82.

As a result, the ball portion 79 is pushed out of the ball holding portion 80 and pressed into the fixing groove portion 85 at the upper portion of the valve rod 13,
The valve rod 13 is fixed. The air pressure supply port 84b
Even if the air pressure from is lost during plant operation, since the spring 82 backs up, the fixing is not released.

In such a structure, the valve rod 13 and the valve body drive mechanism 14 can be attached and detached only by supplying the air pressure, so that workability can be improved. Although the strength of the ball portion 79 may be insufficient, as shown in FIG. 7 as a modified example of the tenth invention, the ball holding portion inside the lens-shaped detaching / attaching portion 78.
By forming the fixing groove portion 80 of the valve rod 13 and the valve rod 13 in a plurality of stages, a structure having higher strength can be obtained.

The valve rod 13 and the valve body drive mechanism in the eleventh invention
FIG. 8 shows the structure for attaching and detaching 14. In this configuration, the drive plate
A chuck type attaching / detaching portion 86 is fixed to 69 (not shown). Further, a fixing groove portion 85 is provided in the upper portion of the valve rod 13.

When the valve rod 13 is connected to the chuck type attaching / detaching portion 86 with this structure, the chuck portion 87 of the chuck type attaching / detaching portion 86 is opened by the air pressure source (not shown), and the fixing groove portion 85 of the valve rod 13 is opened.
Is inserted between the chuck portions 87, and then the chuck portion 87 is closed again. Thereby, the valve body drive mechanism 14 and the valve rod 13 can be fixed. Although not shown, the driving force may be hydraulic pressure, or it may be operated electrically or manually using a mechanical chuck mechanism.

As described above, since the valve body drive mechanism 14 and the valve rod 13 are provided with a mechanism for attaching and detaching the valve rod 13, in particular, the work of separating and connecting the valve rod 13 and the valve body drive mechanism 14 can be performed. It will be easier and the burden on workers will be reduced.

Next, the valve body drive mechanism 14 is removed from the valve lid 58. That is, the bolt (not shown) to which the valve body drive mechanism 14 is attached is removed, and the valve body drive mechanism 14 is hoisted and moved by a hoisting device such as a chain block (not shown).

As described above, since the valve body drive mechanism 14 can be removed from the valve lid 58, a working space for work performed on the valve lid 58 can be secured and workability can be improved.

FIG. 9 shows another example of the second invention in which the valve body drive mechanism 14 is detached from the valve lid 58. This configuration shows a case where the valve body drive mechanism 14 is mounted on the valve lid 58 with an arbitrary number of yoke rods 18, and the yoke rod fixing portion 89 is fixed on the valve lid 58. On the other hand, a yoke rod attaching / detaching portion 90 is provided below the yoke rod 18. The yoke rod fixing portion 89 and the yoke rod attaching / detaching portion 90 are fixed by the connecting portion 91.

With this structure, when the valve body drive mechanism 14 is separated from the valve lid 58, first, the connecting portion 91 of each yoke rod 18 is removed. The connection part 91 is, for example, a cap nut type, and can be removed from the screw part by turning the outside of the connection part 91 with a tool.

Next, the valve body drive mechanism 14 is lifted upward in the direction of the yoke rod 18 by a lifting device such as a chain block or a dedicated work auxiliary device (not shown). Although not shown, a lifting tool may be attached to the valve body drive mechanism 14 to facilitate the lifting.

As a result, the yoke rod attaching / detaching portion 90 is disengaged from the yoke rod fixing portion 89, and the valve disc drive mechanism 14 is moved to the valve lid 58.
It is possible to move it from above. In this way, the valve lid 58 can be obtained by simply removing the connecting portion 91 of each yoke rod 18.
It is possible to remove the valve body drive mechanism 14 from the top relatively easily.

Next, the independently removable ground portion shown in FIG.
Disassemble 59. That is, the valve body drive mechanism 14 is removed from the valve lid 58, and a mounting bolt for fixing the independently removable gland portion 59 to the valve lid 58 in a state where a wide working space is secured.
Remove 64. Next, the push-up part of the independently removable gland part 59
A bolt (not shown) is screwed into 56, and the independently removable gland portion 59 is pushed up from the valve lid 58.

As a result, the independently detachable gland portion 59 is lifted from the valve lid 58, and the valve stem sleeve 61 is also lifted by the frictional force between the gland retainer 65 and the gland 63 which have not been disassembled.

Next, a lifting bolt (not shown) is attached to the independent detachable gland portion 59, and the like so as to be lifted upward in the direction of the valve rod 13 by a lifting device such as a chain block (not shown) or a dedicated removing device.

As a result, the valve stem sleeve 61 and the independent detachable gland 59 are integrally lifted via the gland 63. By lifting the valve stem sleeve 61 until it is pulled out from the valve stem 13, the independently removable gland portion 59 can be removed from the valve lid 58.

As described above, since the gland 63 can be easily removed from the valve lid 58, the gland presser on the valve lid 58 can be pressed.
Since it is not necessary to disassemble the 65 and the gland 63, and the work can be performed in a separate room with a good working environment, the burden on the worker can be reduced. Further, when the valve lid 58 is removed from the valve box 11, it is possible to prevent an accident such that the valve rod 13 and the valve lid 58 come into contact with each other and the valve rod 13 is damaged.

When the valve stem sleeve 61 is not provided and only the independent detachable gland portion 59 is provided, the gland retainer 65 is removed, and then the independent detachable gland portion 59 is removed by the same disassembly procedure. Is possible, and the same effect can be obtained.

Further, the connection between the valve rod 13 and the valve body drive mechanism 14 is firmly fixed by the stud bolts and nuts (not shown) as in the conventional case, and the valve body drive mechanism 14 is mounted on the valve lid 58.
Even with a configuration in which only the separation and independent removal type ground portions 59 are used, similar effects can be obtained by the same disassembly procedure after disassembling the connection parts.

By the procedure as described above, the workability can be improved when disassembling the main steam isolation valve at the time of periodic inspection, etc. When assembling, reverse the disassembling procedure. Thus, workability can be similarly improved.

Next, other embodiments of the third to fifteenth inventions will be described with reference to FIGS. FIG. 10 is a partial sectional view of another embodiment of the third invention. In the figure, the valve lid 58
The valve element drive mechanism 14 is connected and supported by a cylindrical guide 21, and the valve rod 13 ensures the linearity of sliding of the valve element (not shown). The valve lid 58 and the cylindrical guide 21 are flanged
They are connected via 30 and are fixed by bolts 31. Further, the cylindrical guide 21 is provided with a notch 29 for maintenance so that the components inside the guide can be inspected and maintained.

When fixed in this way, the valve lid 58 and the flange portion are
Since the contact portion of 30 is a flat surface, there is no sliding portion when separating / connecting the guides, so that it can be separated from the valve lid 58 simply by lifting it directly by a lifting device such as a chain block. . Therefore, unlike the conventional case, it is not necessary to accurately lift it obliquely upward, and the disassembling and assembling work can be simplified.

By separating the valve body drive mechanism 14 from the valve lid 58, a space for various operations on the valve lid 58 can be secured and workability can be improved. Further, when automating various operations, by separating the valve body drive mechanism 14 and the valve lid 58, various operation devices can be easily installed and workability is improved.

Next, regarding another embodiment of the third invention,
This will be described with reference to FIGS. 11 to 14. Valve lid 58 and valve disc drive mechanism 14
In the main steam isolation valve according to the first aspect of the present invention, in which the cylinder guide 21 is vertically hung by a lifting device such as a chain block during assembly, and is guided to the inclined valve lid 58. However, it is necessary to fix it while performing positioning and alignment to prevent it from falling over. Therefore, as shown in FIGS. 11 and 12, the flange portion 30 of the cylindrical guide 21 is provided with a guide / hinge portion 32 and a flange cutout portion 37.
A flange guide 33 is mounted on the valve lid 58 so that its tip is directed vertically upward with respect to the inclined valve lid 58, and a positioning alignment portion 36 and a guide rod 35 are arranged.

A procedure for installing the cylindrical guide 21 on the valve lid 58 will be described. As shown in FIG. 13 (b), first, the guide / hinge portion 32 is gradually lowered along the flange guide 33 provided on the valve lid 58 to bring them into contact with each other. Then, the flange portion 30 is tilted around the root of the flange guide 33 on the valve lid 58 to align the axial centers of the valve rod 13 and the valve body drive mechanism 14. At this time, the valve rod 13 and the inner surface of the flange portion 30 do not dimensionally interfere with each other.

Then, as shown in FIG. 13C, the flange notch 37 (not shown) is guided by the guide rod 35,
The inner surfaces of the positioning and aligning portion 36 and the flange portion 30 on the 58 are fitted into the spigot for accurate positioning and alignment. In addition, when tilted, the projecting end of the guide / hinge portion 32 fits into the flange guide recess 34 of the flange guide 33 and does not fall down even if the flange portion 30 and the valve body drive mechanism 14 are not completely fixed. It is possible to

The projecting end of the guide / hinge portion 32 and the flange guide concave portion 34 of the flange guide 33 serve as a guide by simply contacting each other when the flange portion 30 is not tilted as shown in FIG. 14 (a). As shown in FIG. 14 (b), the cylinder guide 21 and the valve body drive mechanism 14 are prevented from falling over only when they are tilted. Therefore, when disassembling,
It can be easily removed by the procedure from (b) to (a).

By adopting such a configuration and procedure, guide, positioning, and the like when fixing the valve body drive mechanism 14 to the valve lid 58 with only a lifting device such as a chain block without using a special work auxiliary device, It can be prevented from falling and can easily be connected and fixed.

Next, in the third invention, the bolt fixing means of the flange fixing portion will be described with reference to FIG. 15 (a). The flange portion 30 provided at the end portion of the guide 43 for connecting and supporting the valve disc drive mechanism 14 and the valve lid 58 (not shown) is bolted.
Fixed by 38. By fixing with the bolt 38, the fixing can be performed with high coupling strength and high reliability. Moreover, the weight of the fixed portion can be reduced.

Next, the gray lock fixing means of the flange fixing portion in the third invention will be described with reference to FIG. 15 (b). The flange portion 30 provided at the end of the guide 43 for connecting and supporting the valve disc drive mechanism 14 and the valve lid 58 (not shown) is fixed by a gray lock 24 as shown in FIG. 1B. As a result, the connection strength is high and the fixing can be performed with high reliability, and the number of screws used for tightening is as small as four, so that mounting and removal can be easily performed.

Next, the toggle clamp fixing means of the flange fixing portion in the third invention will be described with reference to FIG. 15 (c). A flange portion 30 provided at the end of the guide 43 for connecting and supporting the valve disc drive mechanism 14 and the valve lid 58 (not shown).
Is fixed by a toggle clamp 39 using a toggle mechanism.

When the lever 40 is opened / closed, the hooking portion of the fixing member 41 is fitted into the groove portion of the valve lid 58 in conjunction with this, and the two are pulled together and fixed. Since the valve lid 58 and the flange portion 30 can be fixed / released only by opening / closing the lever 40, the work is facilitated and the work amount can be reduced.

Next, in the third invention, the pin fixing means of the flange fixing portion will be described with reference to FIG. 15 (d). The flange portion 30 provided at the end portion of the guide 43 for connecting and supporting the valve body drive mechanism 14 and the valve lid 58 (not shown) is attached to the valve lid.
The pin 42 is fitted and fixed in the holes provided in both the 58 and the flange portion 30. Since the flange portion 30 can be fixed / released only by inserting / pulling out the pin 42, the work is facilitated and the work amount can be reduced.

Next, the embodiment of the fifteenth invention will be described with reference to FIG.
Will be explained. When disassembling and assembling the main steam isolation valve, the air cylinder 14a is provided with an air pipe 44 for supplying air for operating the valve body 12 in the opening direction.
Connected through 46.

When disassembling the main steam isolation valve, first, as shown in FIG. 16 (a), air is supplied from the air pipe 44,
The valve body 12 in the valve box 11 is applied to the valve lid 58. Next, tighten the stop valve 46 to keep the contacting state while moving, and
At the pipe connection 45. Then, the gray lock 24 fixing the valve box 11 and the valve lid 58 is removed, and the valve drive mechanism 14, the valve lid 58, the valve body 12 and the valve stem 13 are not individually removed, but the entire valve is collectively operated. Pull out of Box 11.

At this time, as shown in FIG. 16 (b), the valve body 12 is in contact with the valve lid 58, and the contact portion between the valve body 12 and the back surface of the valve lid is the tapered portion 47, so that the moving flow is prevented. The valve body 12 is not displaced to damage the valve rod 13.

Then, as shown in FIG. 16C, the components are disassembled at a place with a good environment, which is different from the place where the valve is installed.
The procedure for separating the valve stem 13 and the valve stem desorption part 19 is as follows.
The drawn whole component is installed on the temporary placing table 48, and the stopper pin 49 is fixed to the cylindrical guide 21.

Next, when the stop valve 46 is gradually opened and the valve body 12 is gently lowered, the valve body receiver 50 is pushed by the valve body 12 and compresses the spring 51, and then descends along the sliding guide 52 to move the spring. The seat 14d hits the stopper pin 49 and stops together with the valve body 12.

In this state, the reaction force of the spring 51 is applied to the valve body 12
And the weight of the valve rod 13 is made slightly smaller than that of the valve rod 13 so that the valve body can be rapidly removed even if the valve rod 13 and the valve rod detaching portion 19 are separated.
The valve body 12 and the valve rod 13 are held without dropping the valve body 12. After the separation, the valve body receiver 50 hits the stopper 53 to stop and the valve body 12 and the valve rod 13 are held.

After separating the valve rod 13 and the valve rod attaching / detaching portion 19, each component is disassembled. According to such a disassembling method, the amount of work is reduced and the work at the valve installation place where the radiation dose is high is reduced, so that the exposure dose can be reduced.

Further, since each component can be disassembled vertically in a wide working place, workability can be improved and the work amount can be reduced. Further, at the time of assembly, the constituent parts are assembled in the reverse order, the valve body 12 is attached to the valve lid 58, and the valve body 12 is assembled together in the valve box 11. At this time, the same effect can be obtained.

Next, an embodiment of the sixteenth invention of the present application will be described.
This will be described with reference to FIGS. 16, 17, and 18. In the disassembling and assembling work of the main steam isolation valve, an air pipe 44 for supplying air for operating the valve body 12 in the opening direction is connected to the air cylinder 14a through a pipe connecting portion 45 and a stop valve 46.

When disassembling the main steam isolation valve, first, as shown in FIG. 16 (a), air is supplied from the air pipe 44,
The valve body 12 in the valve box 11 is applied to the valve lid 58. Next, tighten the stop valve 46 to maintain
At the pipe connection 45. Then, the gray lock 24 that fixes the valve box 11 and the valve lid 58 is removed, and the valve body is driven by the diagonal moving means (not shown) supported by the valve box 11, the main steam pipe, or the structure at the valve installation location. Mechanism 14, valve lid 58,
As shown in FIG. 16B, the valve body 12 and the valve rod 13 are collectively pulled out from the valve box 11. The diagonal moving means (not shown) has a function of adjusting the sliding direction of the valve body so that the valve body and the inner surface of the valve box do not interfere with each other when the valve body is pulled out or inserted.

In order to carry the paper after drawing, it is carried to a desired place by a carrying means such as a carrying trolley (not shown). At this time as well, as shown in FIG. 16B, the valve body 12 is in contact with the valve lid 58, and the contact portion between the valve body 12 and the back surface of the valve lid 58 is the taper portion 47, so that the valve is in motion during movement. Body 12 slips off valve rod 13
Will not damage.

Further, in the case of a valve in which the valve rod 13 is applied to the valve lid 58 to assist the sealing ability of the gland seal,
The structure shown in FIG. 17 allows the valve body 12 to be fixed and held. In FIG. 17A, a fixed ring sliding guide 96 is fixed to the valve lid 58, and a valve body fixing ring 97 is slidably attached and pressed by a pressing spring 98.

As shown in FIG. 17B, when the valve stem 13 is abutted against the valve stem back seat portion 95, the valve body fixing ring 97
Fits in the stepped portion 99 of the valve body 12 and is pushed up against the spring force and stopped. That is, even if a lateral load acts on the valve body 12, the valve body fixing ring 97 is fitted in the step portion 99, so that the fixing ring sliding guide 96 can receive the load.

Therefore, with such a structure, the valve body 12 is fixed and supported in the same manner as when the valve body 12 is brought into contact with the valve lid 58, and damage to the valve rod 13 during movement can be prevented.

Then, as shown in FIG. 16C, the components are disassembled in a place where the environment is different from the place where the valve is installed and where the environment is good. The following procedure is used to separate the valve stem 13 and the valve stem attaching / detaching portion 19. Place the drawn out whole components on the temporary stand 48, and
49 is fixed to the cylindrical guide 21.

Next, when the stop valve 46 is gradually opened and the valve body 12 is gently lowered, the valve body receiver 50 is pushed by the valve body 12 and moves downward along the sliding guide 52 while compressing the spring 51. The seat 14d hits the stopper pin 49, and the valve body 12
Stop with The reaction force of the spring 51 is larger than the weight of the valve body 12 and the valve rod 13 in the initial fully extended state and in this state, and smaller than the weight of the entire valve body drive mechanism 14. Then, the valve rod 13 and the valve rod attaching / detaching portion 19 are separated.

After separating the valve rod 13 and the valve rod attaching / detaching portion 19,
The valve body 12 and the valve rod 13 are separated from the valve body drive mechanism 14 by pulling up vertically by a lifting means such as a chain block (not shown). Then, the valve body 12 and the valve rod 13 are automatically lifted by the spring reaction force, and are fixed and held together with the valve body receiver 50 on the upper portion of the sliding guide 52. Valve stem 13 and valve stem attachment / detachment part 19
After separating, each component is disassembled.

Thus, as shown in FIG. 18, the valve body 12
Fixing work 100 to the valve lid 58, holding work 101 of the valve disc 12, batch oblique pulling work 102 of components other than the valve box 11, temporary placing table 48
Installation work 103, detachment work 104 of valve stem detaching part 19, separation work 105 of valve disc 12 and valve stem 13, and subsequent disassembly work of each part of valve disc drive mechanism 14 to perform a series of disassembly. You can do the work.

According to such a disassembling method, the amount of work at the valve installation place where the amount of radiation is high is reduced, so that the exposure dose can be reduced and the work amount can be reduced. Further, since each component can be disassembled vertically in a wide working place with a good environment, workability can be improved and the work amount can be reduced.

Further, at the time of assembling, the respective components are assembled in the reverse order and the valve body 12 is attached to the valve lid 58. Then, using a chain block (not shown) and a linear motion element, they are collectively assembled in the valve box 11 by an oblique moving means (not shown).
At this time, the same effect can be obtained.

Further, without assembling them all at the time of assembling, the work of inserting the valve body and the valve rod into the valve box, the operation of attaching the valve lid to the valve box, and the valve of the independent detachable gland part are sequentially performed. Attaching to the lid, attaching the valve body drive mechanism to the valve lid,
By the method of mounting the valve rod to the valve body drive mechanism, it is possible to easily confirm and adjust the assembled state of each part.

Furthermore, the order of steps shown in the block diagram of FIG. 21 can be adopted. That is, the work 126 for removing the valve stem from the valve body drive mechanism, the work 127 for removing the valve body drive mechanism from the valve lid, the work 128 for removing the valve body drive mechanism from the valve lid of the independent detachable gland, and the valve box for the valve lid. Is a work process including a work 129 for removing the valve body and the valve stem from the valve box 130.

The above is the case where the direction of extraction / insertion is tilted at an angle. Conversely, if the piping is installed at a tilt and the valve body drive mechanism 14 side is standing vertically, it moves diagonally. Means are unnecessary. With only the chain block and linear motion element, it is possible to pull out and insert at once, which simplifies the work and improves workability.

Next, an embodiment of the seventeenth invention will be described with reference to FIGS. 19 and 16. A case where components other than the valve lid 58 are collectively pulled out or inserted as described in the fifteenth invention will be described. In FIG. 19, the carrier rail 10
A transport unit a108 and a transport unit b111 are movably suspended on a transport rail 107, and a telescopic arm a109 and a telescopic arm b112 having a gate shape are arranged on each of them.

The components other than the valve box 11 are rotatably supported at two points from both sides of the valve lid 58 by the hinge portions 110 at the tip of the telescopic arm a109, and further the lifting hinge portions at the tip of the telescopic arm b112. The upper part is held rotatably at one point by 113.

When pulling out all at once, first, refer to FIG.
As shown in (a), the gray lock 24 is removed, and the horizontal movement of the transport unit a108 and the transport unit b111 is synchronized with the vertical movement of the telescopic arm a109 and the telescopic arm b112, and the whole is slanted to be pulled out. At this time, the pulling-out direction can be adjusted by adjusting the horizontal and vertical positions of the lifting hinge 113 with respect to the lifting hinge 113.

By properly providing the counterweight to support the entire center of gravity in the lifting hinge 113, the lifting hinge 113 only needs to suppress the rotational movement due to a slight catch at the time of extraction and insertion. Therefore, the extraction and insertion work can be performed more smoothly.

After pulling out, as shown in FIGS. 19B to 19C, the transport unit a108 and the transport unit b111 are shown.
Are brought close to each other and the lengths of the telescopic arm a109 and the telescopic arm b112 are adjusted accordingly, thereby vertically standing the whole.

[0175] In this state, it can be transported and installed on the temporary placing table 48 as shown in Fig. 16 (c), and the detailed disassembling work of each part can be performed by the above-mentioned work procedure. At the time of assembling, the assembling work can be performed in the reverse order.

According to such a disassembling and assembling / conveying apparatus,
Even when the valve body drive mechanism is obliquely installed on the valve lid 58, the components other than the valve box 11 can be collectively pulled out and inserted, and the workability is improved and the work amount can be reduced. Furthermore, disassembly / assembly work can be performed corresponding to an arbitrary tilt angle.

Next, an embodiment of the 18th invention will be described with reference to FIGS. 20 and 16. Consider a case where components other than the valve lid 58 are collectively pulled out or inserted as described in the eighteenth invention. In FIG. 20A, the transport rail 114
A transfer unit 115 is suspended on a rail so as to be movable on a rail, and a retractable / supporting arm 116 is arranged on the transfer unit 115.

The components other than the valve box 11 are supported from both sides by a gate-shaped diagonal moving guide 118 that guides during extraction and insertion. Further, it is slidably supported by the guide pin 121 and the sliding guide 122, and the hinge 12
It is slidable by a telescopic rod 124 through 3.

The diagonal movement guide 118 is provided in the notch 120 with the valve box 11
The upper hinge pin 119 is fitted and rotatably connected, and the other end is rotatably connected to the telescopic / support arm 116 by the lifting hinge 117.

When pulling out all at once, first, see FIG. 20 (b).
After removing the gray lock 24, the telescopic rod 124 is contracted, and the components other than the valve box 11 are slidable as shown in Fig.
Pull up along with 2.

At this time, the components other than the valve box 11 are pulled up to a position where the valve body 12 and the flange portion of the valve box 11 do not interfere with each other when the diagonal movement guide 118 is erected vertically. In addition, the direction in which the lifting hinge 117 is pulled out can be adjusted by adjusting the horizontal and vertical positions.

After pulling out, as shown in FIGS. 20 (b) to 20 (c), the transport unit 115 is moved horizontally, and the length of the extension / contraction / support arm 116 is adjusted accordingly, so that the oblique movement guide 118 is moved. Rotate the whole and stand vertically.

Next, as shown in FIG. 20 (c), further expansion / contraction /
If the support arm 116 is contracted and lifted, the diagonal movement guide
Since the end of 118 is a notch 120, it can be separated from the valve box 11 and can be transported together with the diagonal movement guide 118.

It is conveyed in a vertically standing state and installed on the temporary placing table 48 as shown in FIG. 16 (c). For installation, the telescopic / support arm 116 or telescopic rod 124 is extended and hung down. Then, the hinge portion 123 is disconnected and the telescopic / support arm 116 and the telescopic rod 124 are contracted to guide the diagonal movement guide 118.
Lifting only the guide pin 121
It is possible to remove it from the sliding guide opening 125 provided at the end of the slanting guide 118, and to remove the diagonal movement guide 118.

After that, the detailed disassembling work of each part can be performed by the above-mentioned work procedure. At the time of assembling, the assembling work can be performed in the reverse order.

According to such a disassembling and assembling / conveying apparatus,
Even when the valve body drive mechanism is obliquely installed on the valve lid 58, the components other than the valve box 11 can be collectively pulled out / inserted, the workability is improved, and the work amount can be reduced. Furthermore, disassembly / assembly work can be performed corresponding to an arbitrary tilt angle.

[0187]

According to the first to fourth aspects of the invention, the valve body drive mechanism can be easily attached to and detached from the valve lid. Therefore, according to the present invention, when the valve is disassembled and assembled,
A working space on the valve lid can be secured. Further, it becomes relatively easy to introduce an automation device that automates the work on the valve lid.

In the fifth to sixth inventions, the gland portion provided on the valve lid can be independently removed. Therefore, according to the present invention, the work of disassembling the gland portion on the valve lid is facilitated, and the work of disassembling the gland can be performed in a place with a good working environment in a separate room, so that the burden on the operator can be reduced. Further, when the valve lid is removed from the valve box, it is possible to prevent an accident such that the valve stem comes into contact with the valve lid and the valve stem is damaged.

In the seventh to eleventh inventions, the valve body drive mechanism and the valve rod can be easily attached and detached. Therefore, according to the present invention, the burden on the worker can be reduced.

The cylindrical guide in the first invention is a lightweight and highly rigid guide because the guide connecting and supporting the valve lid and the valve body drive mechanism is a cylinder. Therefore,
The guide is easier to handle and disassembly and assembly work is easier. Furthermore, the strength of the valve body is improved and the earthquake resistance is also improved.

Further, the reed switch according to the first aspect of the invention detects the position of the valve body by using a non-contact position detector.
Therefore, it is possible to prevent the detection unit from being mechanically deformed or damaged and becoming undetectable, and thus it is possible to improve the reliability of detection.

In the twelfth aspect of the invention, the valve body drive mechanism can be attached to and detached from the valve lid, and the valve rod can be attached and detached from the valve body drive mechanism. Therefore, according to the present invention, it is possible to smoothly perform a series of operations for attaching and detaching the valve body drive mechanism to the valve lid, and it is possible to improve workability.

In the thirteenth invention, the valve body drive mechanism can be attached and detached from the valve lid, and the independent detachable gland portion can be attached and detached from the valve lid. Therefore, according to the present invention, the independent detachable gland can be attached to and removed from the valve lid in a wide working space where the valve body drive mechanism is not on the valve lid, and workability can be improved.

The fourteenth aspect of the present invention enables the valve body drive mechanism to be detached from the valve lid and the valve rod to be detached from the valve body drive mechanism.
Further, the independent removable gland portion is configured to be detachable from the valve lid. Therefore, according to the present invention, it is possible to smoothly perform a series of operations such as attachment / detachment of the valve body drive mechanism on the valve lid and attachment / detachment of the independent detachable gland portion to the valve lid, thus improving workability. it can.

The sixteenth aspect of the present invention has a structure in which each part of the valve is divided into several parts, so that the handling weight during the disassembling / assembling work is reduced and the handling is improved. Further, when the disassembling / assembling work is performed using the automated equipment, the handling weight of the automated equipment is reduced and the size can be reduced.

The seventeenth invention has a structure in which each part of the valve is divided into several parts. When disassembling the parts, the components other than the valve box can be collectively taken out while the valve body is pressed against the valve lid. The amount of work on the valve box can be reduced, and the taken-out components can be easily disassembled after being transported to a place with good workability. Further, at the time of assembling, by sequentially assembling each part on the valve box, it is possible to easily confirm and adjust the assembling state of each part.

The eighteenth aspect of the present invention has a structure in which each part of the valve is divided into several parts, which reduces the handling weight of the work when disassembling the valve and improves the handleability. Further, at the time of assembly, components other than the valve box can be collectively attached to the valve box with the valve element being pressed against the valve lid, so that workability is improved and the burden on the operator can be reduced.

As described above, according to the present invention, the handling weight at the time of disassembling / assembling work is reduced, the handleability is improved, and when disassembling / assembling work is performed using an automated device,
The handling weight of automated equipment is reduced, downsizing is possible, and the workability of disassembling and assembling the valve is improved, so the reliability of the work is improved, thus the reliability of the large valve and the nuclear power plant. The reliability of is also improved.

[Brief description of drawings]

FIG. 1 (a) is a vertical cross-sectional view showing a partial side view of a main steam isolation valve for explaining the first to fifteenth inventions, and FIG. 1 (b) is (a).
A is a front view seen from the direction of arrow AA, and (c) is A of (a).
-A cross-sectional view taken along the direction of arrow A.

FIG. 2 is a vertical sectional view showing the configuration of an embodiment of the sixth invention.

FIG. 3 is a vertical cross-sectional view showing an enlarged upper portion of the valve rod of FIG. 2 and a vertical cross-sectional view showing a detachable portion of the valve rod according to an embodiment of the twelfth invention.

FIG. 4 is a vertical cross-sectional view showing a modified example of the detachable portion of the valve rod of the eighth invention.

FIG. 5 is a vertical sectional view showing a detachable portion of a valve rod according to an embodiment of the ninth invention.

FIG. 6 is a vertical sectional view showing a detachable portion of a valve rod according to an embodiment of the tenth invention.

FIG. 7 is a vertical sectional view showing a modification of the tenth invention.

FIG. 8 is a vertical cross-sectional view showing a detachable part of a valve rod according to an eleventh invention.

FIG. 9 is a vertical sectional view showing the configuration of an embodiment of the second invention.

FIG. 10 is a partial vertical cross-sectional view showing the configuration of a valve body drive mechanism attachment / detachment section according to another embodiment of the third invention.

FIG. 11A is a view showing a structure of a flange portion in a valve body drive mechanism attaching / detaching portion according to another embodiment of the fourth invention.
6B is a view taken along the line CC of FIG. 6B, FIG. 6B is a view taken along the line AA of FIG.

FIG. 12 (a) is a front view showing the structure of the valve lid side according to another embodiment of the fourth invention, (b) is a view taken in the direction of arrow A in (a), and (c) is in (a). FIG.

13 (a) is a first state diagram for explaining a connection procedure of a valve lid and a flange portion at the time of assembly in another embodiment of the fourth invention, and FIG. 13 (b) shows a cylindrical guide in FIG. 13 (a). Figure with the flange guide attached, (c) is (b)
FIG. 6 is a view showing a state in which the guide lock is attached to the cylindrical guide in FIG.

FIG. 14 (a) is a front view showing a partial cross-section of the relationship between a flange guide and a guide / hinge portion during assembly in another embodiment of the fourth invention, and FIG. 14 (b) is a flange of the guide / hinge portion. The state figure fitted in the guide recessed part.

FIG. 15 (a) is a schematic view showing a state in which the flange portion and the valve lid according to the third invention are fixed by bolts, FIG. 15 (b) is a schematic view in which they are also fixed by a gray lock, and FIG. The schematic diagram fixed with a clamp, (d) The schematic diagram fixed with a pin.

FIG. 16 (a) is a diagram showing a first state for explaining the disassembling procedure of the large-sized valve in the embodiment of the fifteenth invention,
(B) is a figure which shows the state which removed the valve body from the valve box in (a), (c) is a figure which shows the state which installed the valve lid in the temporary stand in (b).

FIG. 17 (a) is a longitudinal sectional view for explaining a method of fixing and holding the valve body of the large-sized valve in the embodiment of the sixteenth invention;
(B) is a longitudinal cross-sectional view showing a state where the valve body is lifted from the state of (a).

FIG. 18 is a work flow diagram for explaining a disassembling procedure of the large-sized valve according to the sixteenth invention.

FIG. 19 is a view for explaining the disassembling / assembling / transporting procedure of the large-sized valve according to the seventeenth invention, in which (a) is a schematic view showing a state before withdrawing the valve body, and (b) is a diagram showing the valve body. Schematic which shows the state after pulling out, (c) is the schematic which shows the state which conveyed the valve body.

FIG. 20 is a view for explaining the disassembling / assembling / transporting procedure of the large-sized valve according to the eighteenth invention, wherein (a) is a schematic view showing a state where the valve body is assembled, and (b) is a valve body pulled out. FIG. 6C is a schematic view showing a state after the valve body is opened, and FIG.

FIG. 21 is a block diagram showing another work procedure in the embodiment of the sixteenth invention.

FIG. 22 is a system diagram showing a nuclear power plant system for explaining a conventional technique.

FIG. 23 is a sectional view showing a part of the configuration of a conventional large-sized valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor pressure vessel, 2 ... Main steam pipe, 3 ... Steam turbine, 4 ... Reactor containment vessel, 5 ... 1st main steam isolation valve (inner valve), 6 ... 2nd main steam isolation valve, 7 ... condenser, 8 ... water supply system, 9 ... main steam third valve, 10 ... header, 11 ... valve box, 11a ...
Inlet end portion, 11b ... Outlet end portion, 11c ... Valve body housing portion, 12 ... Valve body, 13 ... Valve rod, 14 ... Valve body drive mechanism, 14a ... Air cylinder, 14b ... Oil cylinder, 14c ... External spring, 14
d ... Spring seat, 14e ... Coupling, 15 ... Inlet guide rib, 16 ... Valve seat, 17 ... Valve lid, 18 ... Yoke rod,
19 ... Valve rod attaching / detaching portion, 20 ... Independent detachable gland portion, 21 ... Cylindrical guide, 22 ... Valve drive mechanism attaching / detaching portion, 23 ... Fixing means, 24 ...
Gray lock, 25 ... Nut, 26 ... Through bolt, 27 ... Non-contact position detector, 28 ... Plate, 29 ... Notch for maintenance, 30 ...
Flange, 31 ... Bolt, 32 ... Guide / hinge, 33 ...
Flange guide, 34 ... Flange guide recess, 35 ... Guide rod, 36 ... Positioning alignment part, 37 ... Flange notch part, 38
… Bolts, 39… Toggle clamps, 40… Levers, 41… Fixing members, 42… Pins, 43… Guides, 44… Air pipes, 45… Pipe connections, 46… Stop valves, 47… Tapered parts, 48… Temporary stand , 49 ... Stopper pin, 50 ... Valve body receiver, 51 ... Spring, 52 ... Sliding guide, 53 ... Stopper, 54 ... Venturi tube, 55 ... Shaft, 56 ... Push up part, 57 ... Disc spring, 58 ... Valve lid , 59 ... Independent removable gland, 60, 62 ... Fixed seal, 61 ... Valve stem sleeve, 63 ... Gland, 64 ... Mounting bolt, 65 ... Gland retainer, 66 ... Cylindrical nut, 67 ... Friction bush, 68
… Mounting part, 69… Drive plate, 70… Pressing nut, 71… Rotating nut, 72… Pressure bolt, 73… Thin part, 74… Oil, 75…
Boss part, 76 ... Removable nut, 77 ... Positioning pin, 78 ... Ball detaching part, 79 ... Ball part, 80 ... Ball holding part, 81 ... Movable sleeve,
82 ... Spring, 83 ... O-ring, 84a, 84b ... Air pressure supply port,
85 ... Fixing groove part, 86 ... Chuck type attaching / detaching part, 87 ... Chuck part, 88 ... Driving force supplying part, 89 ... Yoke rod fixing part, 90 ...
Yoke rod attachment / detachment part, 91 ... Connection part, 92 ... Backup fixed seal, 93 ... Fixed seal retainer, 94 ... Non-rotating nut, 95 ... Valve rod back seat part, 96 ... Fixed ring sliding guide, 97 ... Valve body fixed Ring, 98 ... Pressing spring, 99 ...
Stepped portion, 100 ... Fixing of valve body to valve lid, 101 ... Holding work of valve body, 102 ... Diagonal pull-up work at once, 103 ... Installation work on temporary stand, 104 ... Separation work of valve stem attaching / detaching part, 105 …
Separation work of valve body and valve stem, 106 ... Disassembly work of each part of valve body drive mechanism, 107 ... Transport rail, 108 ... Transport unit a,
109 ... Telescopic arm a, 110 ... Hinge part, 111 ... Transport unit b, 112 ... Telescopic arm b, 113 ... Lifting hinge part,
114… Conveying rail, 115… Conveying unit, 116… Expansion / contraction
Support arm, 117 ... Lifting hinge part, 118 ... Oblique movement guide, 119 ... Hinge pin, 120 ... Notch part, 121 ... Guide pin, 122 ... Sliding guide, 123 ... Hinge part, 124 ... Telescopic rod, 125 ... Sliding guide Opening, 126… Removal work of valve stem from valve body drive mechanism, 127… Removal work from valve body drive mechanism valve lid, 128… Removal work from valve lid of independent detachable gland part, 129… Valve lid removal work Removal work from the valve box,
130… Detachment work of valve body and stem from valve box.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G21D 1/00 GDB

Claims (18)

[Claims] 1. A large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, and a valve lid fixed to the valve box via a fixed seal portion and the valve lid or the valve. A valve body drive mechanism detachably attached to the box, a valve body drive mechanism attaching / detaching portion for connecting and detaching the valve lid or the valve box and the valve body drive mechanism, and being connected to the valve body. A large valve comprising a valve stem connecting portion for connecting the valve stem to the valve body drive mechanism and a gland portion for slidingly sealing the valve lid and the valve stem. 2. An arbitrary number of yoke rods for fixing the valve body drive mechanism on a valve lid and guiding opening / closing operations of the valve body, a yoke rod attaching / detaching portion provided at a lower end of the yoke rod, and the valve. 2. The large valve according to claim 1, comprising a yoke rod fixing portion fixed to the lid, and a connecting portion connecting and disconnecting the yoke rod attaching / detaching portion and the yoke rod fixing portion. 3. A guide part having an arbitrary shape for fixing the valve body drive mechanism on a valve lid and guiding the opening / closing operation of the valve body, and a flange part arranged at a lower end of the guide part. The large-sized valve according to claim 1, wherein the large-sized valve comprises a flange fixing portion for fixing and removing the flange portion to the valve lid. 4. The valve lid has a flange guide portion for connecting the flange portion and a positioning and aligning portion for positioning and aligning, and the flange portion is a flange guide on the valve lid. And a guide / hinge portion that prevents the tip from falling over until the flange is completely fixed. The large valve according to item 1. 5. A large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, and a valve lid fixed to the valve box via a fixed seal portion and further to the valve lid. And a valve element drive mechanism fixed on the valve lid or the valve box, and connected to the valve element. Large valve comprising a valve stem connecting portion that connects the valve stem to the valve body drive mechanism. 6. A large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, the valve being fixed to the outer periphery of a valve rod connected to the valve body via a fixed seal portion. A rod sleeve, a valve lid fixed to the valve box via a fixed seal portion, and an independent valve fixed to the valve lid via a fixed seal portion and slidingly sealed between the valve sleeve and the valve rod sleeve. A large valve comprising a detachable gland portion, a valve body driving mechanism fixed on the valve lid or the valve box, and a valve rod connecting portion connecting the valve rod to the valve body driving mechanism. . 7. A large valve reciprocally mounted in a valve box that opens and closes a fluid flow path, and a valve lid fixed to the valve box via a fixed seal portion, and fixed to the valve lid or the valve box. A valve body drive mechanism to be installed, and a valve body attaching / detaching portion provided on the valve body drive mechanism side and the valve body side for easily connecting and disconnecting the valve body and the valve body drive mechanism connected to the valve body. And a gland portion for slidingly sealing the valve lid and the valve stem. 8. The friction bush having the fastening portion for attaching a fastening force to the inner surface of the valve rod attaching / detaching portion attached to the lower portion of the valve body drive mechanism by a friction bush fixing portion, and the valve rod upper portion. And a valve rod friction fixing portion having a cylindrical friction surface that is coupled to a cylindrical surface inside the friction bush, and a valve is provided by applying or releasing a tightening force, that is, a friction force to the valve rod friction fixing portion of the friction bush. The large-sized valve according to claim 7, wherein the rod and the valve body drive mechanism are detached from each other. 9. The valve rod attaching / detaching portion is a boss screw portion provided on a lower portion of a drive plate of a valve body drive mechanism, a cylindrical nut attached to a screw portion on an upper portion of the valve rod, and a cylinder attached to a valve rod. It consists of a detachable nut that is attached to the boss screw part at the bottom of the drive plate with the nut sandwiched, and a detent nut to prevent the detachable nut from rotating.The valve rod can be attached to and detached from the boss screw part of the detachable nut. The large valve according to claim 7, wherein the valve drive mechanism and the valve drive mechanism are detached. 10. The valve rod attaching / detaching portion is fixed to a lower portion of a drive plate of a valve body drive mechanism, and has a lens-shaped attaching / detaching portion having a drive portion for moving an internal ball portion in a radial direction of the valve rod, and an upper portion of the valve rod. Which is provided with a fixing groove portion having a groove having a shape to be coupled with the target lens detaching portion, the connection between the target lens detaching portion and the fixing groove portion,
The large valve according to claim 7, wherein the valve rod and the valve body drive mechanism are detached by detaching. 11. A chuck type attaching / detaching portion, wherein the valve rod attaching / detaching portion is fixed to a lower portion of a drive plate of a valve body driving mechanism, and has a chuck portion having a drive portion and a chuck portion that moves in a radial direction of the valve rod by the drive portion, Detachment of the valve rod and the valve disc drive mechanism by connecting and disconnecting the chuck type attaching / detaching part and the fixing groove part, which is provided on the upper part and is composed of a fixing groove part having a groove shaped to be combined with the chuck type fixing part. The large-sized valve according to claim 7, wherein 12. A large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, and a valve lid fixed to the valve box via a fixed seal portion and the valve lid or the valve. A valve body drive mechanism detachably attached to the box,
The valve disc drive mechanism attaching / detaching portion for connecting / supporting and detaching the valve lid / valve and the valve disc drive mechanism, and the valve rod and the valve disc drive mechanism connected to the valve disc are easily connected / disconnected. Therefore, a large valve comprising a valve stem attachment / detachment portion provided on the valve body drive mechanism side and the valve stem side, and a gland portion for slidingly sealing between the valve lid and the valve stem. 13. A large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, and a valve lid fixed to the valve box via a fixed seal portion and a valve lid for the valve lid. An independent detachable gland portion fixed via a fixed seal portion and slidingly sealing between the valve rod and the valve body drive mechanism detachably attached to the valve lid or the valve box;
A valve body drive mechanism attaching / detaching portion for connecting and supporting the valve lid or the valve box and the valve body drive mechanism and for attaching / detaching, and a valve rod connecting portion for connecting the valve rod connected to the valve body with the valve body drive mechanism. Large valve characterized by being composed of 14. A large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, and a valve lid fixed to the valve box via a fixed seal portion and a valve lid for the valve lid. An independent detachable gland portion fixed via a fixed seal portion and slidingly sealing between the valve rod and the valve body drive mechanism detachably attached to the valve lid or the valve box;
The valve disc drive mechanism attaching / detaching portion for connecting / supporting and detaching the valve lid / valve and the valve disc drive mechanism, and the valve rod and the valve disc drive mechanism connected to the valve disc are easily connected / disconnected. Therefore, a large-sized valve comprising a valve body drive mechanism side and a valve stem attaching / detaching portion provided on the valve stem side. 15. When the disassembling work, the valve body in the valve box is brought into contact with the valve lid and the whole is taken out from the valve box, and then each component is disassembled. A method for disassembling and assembling a large valve, characterized in that the body is brought into contact with the valve lid and combined with the valve box. 16. A method for disassembling and assembling a large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, wherein valve rods are sequentially removed from a valve body drive mechanism during the disassembling work. Work, removing work from the valve lid of the valve body drive mechanism, removing work from the valve lid of the independently removable gland, removing work from the valve lid's valve box, and removing from the valve body and valve stem's valve box The disassembling / assembling method for a large valve, wherein the disassembling / assembling operation is performed, and the assembling operation is performed in the reverse order of the disassembling operation of the large valve. 17. In a method for disassembling and assembling a large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, the valve body is first fixed to a valve lid when disassembling the valve.・ While holding the components, take out the components other than the valve box at once, and then disassemble each component, and when assembling the valve,
Sequentially inserting the valve disc and stem into the valve box, attaching the valve lid to the valve box, attaching the independent detachable gland to the valve lid, and attaching the valve drive mechanism to the valve lid. A method for disassembling and assembling a large-sized valve, characterized in that mounting work and mounting work of a valve rod to a valve body drive mechanism are carried out. 18. In a method for disassembling and assembling a large valve in which a valve body for opening and closing a fluid flow path is reciprocally mounted in a valve box, when disassembling the valve, the valve rod drive mechanism for the valve rod is sequentially operated. Removal work, removal work from the valve cover of the valve body drive mechanism, removal work from the valve cover of the independent removal type gland part, removal work from the valve cover of the valve cover and valve body of the valve body and valve stem When assembling, first assemble each component, and then fix the valve body to the valve lid.
A method for disassembling and assembling a large valve, in which components other than the valve box are collectively attached to the valve box in a held state.