Device and method for attaching / detaching operating unit to / from valve box in valve device

Abstract

To provide an attaching / detaching device of an operating machine capable of accurately performing attaching / detaching work of the operating machine by improving workability in the attaching / detaching work of the operating machine from a valve casing in a valve device.SOLUTION: The attaching and detaching device 100 includes a separating portion 2, a separation restricting portion 3, and a rotation restricting portion 4. The separating portion 2 separates the operating unit 20 from the valve box 10 in the direction of the axis C of the valve stem 12 to form a space S. The separation restricting portion 3 restricts the amount of separation of the operation device 20 by the separating portion 2 to less than a predetermined distance. In the rotation restricting portion 4, the rotation restricting member 50 is inserted into the space S to restrict the rotation of the valve stem 12 with respect to the valve box 10. The predetermined distance is a fitting length between the valve stem 10 and the output shaft 26 in the axis C direction. A regulation member opening / closing display 58 is displayed on the rotation regulation member 50, and the insertion direction of the rotation regulation member 50 into the space S is a direction in which the position of an opening / closing display 28 displayed on the operation machine 20 corresponds to the position of the regulation member opening / closing display 58.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a device and method for attaching and detaching an actuator from a valve body in a valve device. [Background technology]

[0002] In the valve device, an actuator that rotates the valve to open and close it is attached to the valve body. The valve stem, which is the rotating shaft of the valve, fits axially with the output shaft of the actuator, engaging in the rotational direction. The actuator reduces the rotational input from the input shaft using a reducer, and rotates the output shaft and valve stem to open and close the valve. The provision of a reducer increases the reverse rotational force of the output shaft (the force required to rotate the output shaft), making it difficult for the valve stem engaged with the output shaft to rotate. This allows the valve device to maintain the rotational position of the valve stem in a position corresponding to the open state against the water pressure acting on the valve when water is passing through (valve open state).

[0003] The actuator must be detached for replacement or maintenance, but this detachment work is sometimes performed with water flowing through the valve. During detachment, the valve stem is disengaged from the output shaft, allowing the valve stem to rotate freely, making it difficult for the valve device to maintain the rotational position of the valve stem in the open position against the water pressure when water is flowing. In this case, the valve becomes open and closes freely, making it difficult to perform detachment work properly, as the valve may be unintentionally closed.

[0004] That is, there is a problem that the operation of attaching and detaching the actuator must be carried out while the valve is kept open. In response to this, for example, the attachment and detachment method described in Patent Document 1 maintains the engagement between the valve stem and the actuator (output shaft) by separating the actuator from the valve body by a predetermined gap while maintaining the engagement state, passes a processing tool through the predetermined gap to form an engagement part between the valve body and the valve stem, and detaches the actuator with the engagement part functioning as a rotation stopper for the valve stem. In this way, the attachment and detachment method described in Patent Document 1 makes it possible to attach and detach the actuator while maintaining the water flow state (valve open state). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-100764 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the detachment method described in Patent Document 1, if the fitted portion between the actuator and the valve stem is difficult to separate due to, for example, sticking, a large force is required to separate the actuator from the valve stem. A large force makes it difficult to control the dimensions to maintain the engagement between the valve stem and the actuator, and if the separation distance (separation amount) is mistakenly made too large, the engagement between the valve stem and the actuator may be released and the engagement may not be maintained.

[0007] Furthermore, replacing the operating device requires work near underground water pipes, which requires a limited work space and poor visibility. However, the removal and installation method described in Patent Document 1 is only intended for work up to the removal of the operating device, and there is a possibility that the work will not be carried out properly after the removal of the operating device, for example, when installing a new operating device, for example, by installing the new operating device in the wrong direction. In other words, the removal and installation method described in Patent Document 1 has issues with the ease of replacing the operating device from the valve box, which may make it impossible to remove and install the operating device properly while maintaining water flow.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an actuator detachment device and detachment method that improves the workability of the detachment work when attaching and detaching an actuator to a valve box in a valve device, thereby enabling the actuator to be detached properly. [Means for solving the problem]

[0009] According to one aspect of the present invention, the detaching device includes a valve body having a valve stem inserted therethrough and a valve element that opens and closes an internal space by rotating the valve stem about an axis; An actuator that is attached to a valve body and rotates an output shaft that is axially fitted with a valve stem and engages with the valve stem around the axis, thereby opening and closing a valve element, An operating device that displays the open / closed state of the valve disc; In a valve device equipped with the above, a detachment device for attaching and detaching an actuator from a valve body, a separation section that separates the actuator from the valve body in the axial direction to form a space between the valve body and the actuator; a separation restriction unit that restricts the distance by which the operating device is separated by the separation unit to less than a predetermined distance; a rotation restricting member inserted into the space to restrict rotation of the valve stem relative to the valve body about its axis; Equipped with The predetermined distance is an axial fitting length between the valve stem and the output shaft, The rotation restricting member has a restricting member open / close indicator indicating the open / close state of the valve body, The insertion direction of the rotation restricting member into the space is a direction in which the position of the open / closed indicator corresponds to the position of the restricting member open / closed indicator.

[0010] According to this, the separation limiting portion of the detachment device limits the amount of separation to less than the engagement length between the valve stem and the actuator. Therefore, the detachment device can prevent the engagement between the valve stem and the actuator from being disengaged by accidentally increasing the separation amount too much, even when a large force is applied to the actuator during detachment. This maintains the engagement between the valve stem and the output shaft of the actuator, allowing the detachment device to detach the actuator while keeping the valve disc open. Furthermore, in the detachment device, the rotation limiting member is inserted into the space so that the position of the open / close indicator on the actuator corresponds to the position of the limiting member open / close indicator on the rotation limiting member. Therefore, after removing the actuator from the valve box, for example, when attaching a new actuator to the valve box, the new actuator can be attached to the valve box so that the position of the open / close indicator on the new actuator corresponds to the position of the limiting member open / close indicator on the rotation limiting member inserted in the space. Therefore, even in a work environment with limited working space and poor visibility, the detachment device can accurately attach a new actuator to the valve body and return the valve device to the state it was in before the actuator was removed. Therefore, the detachment device can reliably detach and attach the actuator while maintaining the water flow state (open state of the valve disc) and preventing the valve stem from rotating.

[0011] In the attachment / detachment device according to the second invention, the rotation restricting member is The valve has a first engagement portion that engages with the valve stem and a second engagement portion that engages with the valve body, the first engagement portion restricts rotation of the valve stem about the axis relative to the rotation restriction portion; The second engagement portion restricts rotation of the rotation restriction portion relative to the valve body around the axis.

[0012] According to this, the rotation restricting member of the attachment / detachment device has a first engagement portion that restricts rotation of the valve stem about the axis relative to the rotation restricting portion, and a second engagement portion that restricts rotation of the rotation restricting portion about the axis relative to the valve body. Thus, the rotation restricting portion can restrict rotation of the valve stem about the axis relative to the valve body.

[0013] The open / close indicator of the detachment device according to the third invention displays an open indicator indicating an open state of the valve body and a closed indicator indicating a closed state of the valve body, The restriction member open / closed indicator displays a restriction member open indicator indicating an open state of the valve body and a restriction member closed indicator indicating a closed state of the valve body; The insertion direction is a direction in which the relative positional relationship between the open indicator and the closed indicator corresponds to the relative positional relationship between the restricting member open indicator and the restricting member closed indicator.

[0014] According to this, the detachment device is inserted into the space so that the relative positional relationship between the open and closed indicators shown on the actuator corresponds to the relative positional relationship between the restricting member open indicator and the restricting member closed indicator shown on the rotation restricting member. Therefore, for example, when attaching a new actuator to the valve box, the new actuator can be attached to the valve box so that the relative positional relationship between the open and closed indicators shown on the new actuator corresponds to the relative positional relationship between the restricting member open indicator and the restricting member closed indicator shown on the rotation restricting member. Therefore, in addition to the same effects as the first invention described above, the detachment device can indicate the insertion direction with a simple configuration.

[0015] The separation portion of the detachment device according to the fourth invention is a plate-shaped base member connected to the operating device; a jack mechanism that moves the base member in the axial direction; It has the following characteristics.

[0016] According to this, the jack mechanism of the detachment device applies a force to move the base member, and applies a separating force to separate the actuator connected to the base member from the valve body in the axial direction. That is, by having the jack mechanism, the detachment device can efficiently convert the applied force into a separating force to gradually separate the actuator from the valve body. As a result, the detachment device can easily manage the amount of separation of the actuator in the axial direction to maintain the engagement between the valve stem and the actuator, and can therefore maintain the engagement between the valve stem and the actuator.

[0017] The jack mechanism of the attachment / detachment device according to the fifth invention is a pair of jack bolts each having one end penetrating the base member from above in the axial direction by being threaded into a pair of screw holes formed at both ends of the base member; A pair of support members are provided on the upper part of the valve box and support one end of each of the pair of jack bolts. It further has the following.

[0018] According to this, in the jack mechanism of the detaching device, a rotational force is applied to the other end of each of the pair of jack bolts, and the axial force is applied to the operating device as a separating force via the base member, with the support member supporting one end of the jack bolt as a fulcrum. In other words, by having a screw-type jack mechanism, the detaching device can efficiently convert the rotational force applied to the jack bolts into a separating force to gradually separate the operating device from the valve box. Therefore, in addition to the effects similar to those of the fourth invention described above, the detaching device can realize a jack mechanism with a simple configuration at low cost.

[0019] The separation restriction portion of the attachment / detachment device according to the sixth aspect of the present invention comprises: A separation restriction member is provided on each of the pair of jack bolts, The separation restriction members are provided in a range in which the distance between the lower surface of the separation restriction member and the upper surface of the base member that screws onto each jack bolt is less than the predetermined distance.

[0020] According to this, in the detachment device, a rotational force is applied to the other end of each of the pair of jack bolts, and as the actuator separates from the valve body, the upper surface of the base member and the lower surface of the separation restriction part approach each other. The upper surface of the base member and the lower surface of the separation restriction part then come into contact, restricting further threading of the jack bolts into the base member, thereby restricting the distance the actuator separates from the valve body. Since the distance between the upper surface of the base member and the lower surface of the separation restriction part is less than the predetermined distance, the distance the actuator separates from the valve body is restricted to be less than the engagement length between the valve stem and the actuator. Therefore, the detachment device can maintain the engagement between the valve stem and the actuator, and maintain the engagement between the valve stem and the actuator.

[0021] The method for attaching and detaching according to the seventh aspect of the present invention is a valve body having a valve stem inserted therein and rotated about an axis thereof to open and close an internal space of a valve disc; An actuator that is attached to a valve body and rotates an output shaft that is axially fitted with and engaged with a valve stem around the axis, thereby opening and closing a valve element, An operating device that displays the open / closed state of the valve disc; A method for attaching and detaching an actuator from a valve body in a valve device comprising: a step of separating the actuator from the valve body in the axial direction to form a space between the valve body and the actuator; a step of inserting a rotation restricting member into the space to restrict rotation of the valve stem about the axis relative to the valve body; Equipped with In the step of separating the actuator from the valve body in the axial direction, The distance by which the actuator is separated is regulated to be less than the fitting length between the valve stem and the output shaft in the axial direction, The rotation restricting member has a restricting member open / close indicator indicating the open / close state of the valve body, The insertion direction of the rotation restricting member into the space is indicated as the direction in which the position of the open / close indicator corresponds to the position of the restricting member open / close indicator.

[0022] According to this, the detaching method can achieve the same effects as the first invention described above. [Effects of the Invention]

[0023] According to the present invention, in the work of attaching and detaching an actuator to and from a valve body in a valve device, the workability of the attachment and detachment work can be improved, thereby allowing the actuator to be attached and detached appropriately. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective view showing an example of a valve device in which a detachment device according to the present invention is used. [Figure 2] 10 is a plan view showing a modified example of an open / close display of an operating device in the valve device. FIG. [Figure 3] FIG. 2 is a perspective view showing a state in which the detachment device according to the first embodiment of the present invention is attached to the valve device. [Figure 4] 4 is a plan view of FIG. 3 as viewed from above (hereinafter referred to as "the plan view"). [Figure 5] 5 is a longitudinal cross-sectional view taken along line AA in FIG. 4 (hereinafter referred to as "same longitudinal cross-sectional view") and a partially enlarged top view. [Figure 6] FIG. 6 is a cross-sectional view taken along line BB in FIG. 5. [Figure 7A] FIG. 4 is a plan view of a rotation restricting member in the attachment / detachment device. [Figure 7B] FIG. 4 is a front view of a rotation restricting member in the attachment / detachment device. [Figure 8] 5 is a vertical cross-sectional view showing a method for attaching and detaching an operating device using the detaching device. FIG. [Figure 9] 9 is a cross-sectional view taken along line BB in FIG. 8, showing the same detachment method. [Figure 10] FIG. [Figure 11] 11 is a cross-sectional view taken along line BB in FIG. 10 (hereinafter referred to as "the cross-sectional view"), illustrating the same detachment method. [Figure 12] FIG. [Figure 13]4 is a cross-sectional view showing the same detachment method. FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] 3A and 3B are a plan view and a partially enlarged top view showing the same detachment method. [Figure 17] FIG. [Figure 18A] 10 is a plan view of a rotation restricting member in an attachment / detachment device according to a second embodiment of the present invention. FIG. [Figure 18B] FIG. 10 is a front view of a rotation restricting member in an attachment / detachment device according to a second embodiment of the present invention. [Figure 19] FIG. 10 is a front view showing a support member in an attachment / detachment device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, a description will be given of an attachment / detachment device 100 according to an embodiment of the present invention with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated. In the following description, terms indicating positions or directions, such as "upper," "lower," "horizontal," and "vertical," may be used. These terms are used for convenience to facilitate understanding of the embodiment, and are not limited to positions or directions when actually implemented. <Embodiment 1>

[0026] [Valve device 1] An example of a valve device 1 in which an attachment / detachment device 100 according to the present invention is used will be described with reference to FIG.

[0027] FIG. 1 shows a butterfly valve, which is an example of a valve device 1. The butterfly valve is installed, for example, in a pipe buried underground. As shown in FIG. 1, the valve device 1 includes a valve box 10 in which a disk-shaped valve disc 11 is disposed, and an operating device 20 that opens and closes the valve disc 11. A valve stem 12 is inserted into the valve box 10. When the valve stem 12 is rotated around an axis C, the valve disc 11, which is integral with the valve stem 12, opens and closes the internal space of the valve box 10. The valve box 10 is provided with a valve box flange 14, an upper boss 15, and a lower boss 16. The valve stem 12 is rotatably supported by the upper boss 15 and the lower boss 16 via a bearing or the like (not shown). A convex spline 13 is formed on the outer surface of the upper end of the valve stem 12.

[0028] The actuator 20 has a housing 21, an input shaft 24 rotatably supported on the housing 21 via bearings or the like (not shown), an output shaft 26 (an example of a rotating shaft) facing downward, and a reduction mechanism 25 interposed between the input shaft 24 and the output shaft 26. The output shaft 26 is a coupling with a concave spline 27 formed on its inner surface. An actuator flange 23 is provided at the bottom of the housing 21, and the actuator flange 23 has a plurality of fastening through-holes 29 formed in positions corresponding to the plurality of fastening screw holes 18 formed in the valve box flange 14. The actuator 20 is fastened (an example of attachment) to the valve box 10 by passing a plurality of fastening bolts 61 through the fastening through-holes 29 and screwing them into the fastening screw holes 18, with the actuator flange 23 facing the valve box flange 14. At this time, the concave spline 27 of the output shaft 26 fits with the convex spline 13 of the valve stem 12 over a fitting length L1, thereby engaging the output shaft 26 and the valve stem 12 in the rotational direction. In this embodiment, the fitting between the valve stem 12 and the output shaft 26 is spline fitting, but it may also be configured by key fitting or the like. Although not shown, the reduction mechanism 25 is configured by, for example, a planetary gear reducer.

[0029] 1, a sleeve 28 is provided on the upper surface of the housing 21 of the actuator 20. The sleeve 28 is provided with an open indicator 28b indicating the open state of the valve element 11 and a closed indicator 28c indicating the closed state, as open / close indicators for showing the open / closed state of the valve element 11. A marking 24b indicating the open / closed state of the valve element 11 is provided on the side surface of the input shaft 24 (described in detail below).

[0030] The input shaft 24 of the operating device 20 is rotated by an operator from the ground using an operating handle or the like (not shown), and the rotation of the input shaft 24 is reduced by a reduction mechanism 25 to rotate the output shaft 26. This rotates the valve stem 12 engaged with the output shaft 26, and the valve element 11 attached to the valve stem 12 is opened and closed. As described above, the present invention provides an attachment / detachment device 100 that can improve the workability of attaching and detaching the operating device 20 in situations where the operating device 20 needs to be attached or detached for replacement or the like while maintaining the valve element 11 in an open state when water is flowing in the direction of the arrow D1 shown in the figure.

[0031] As shown in FIG. 2 , the sleeve 28 of the actuator 20 may be further configured to have an open indicator 28d positioned opposite the open indicator 28b across the axis C as an indicator for indicating the open state of the valve disc 11. In this embodiment, the valve device 1 is assumed to have a valve stem 12 that rotates counterclockwise around the axis C when the valve disc 11 is closed, thereby opening the valve disc 11. However, a valve device 1d (not shown) is also assumed to have a valve stem 12 that rotates clockwise around the axis C when the valve disc 11 is closed, thereby opening the valve disc 11. By providing the open indicator 28d on the sleeve 28 as described above, even in the case of the valve device 1d, the open state of the valve disc 11 can be confirmed by the fact that the open indicator 28d and the marking 24b are positioned opposite each other, as shown in the figure. In other words, with the above configuration, the sleeve 28 can be used in both the valve devices 1 and 1d.

[0032] [Configuration of the detachment device 100] Next, the configuration of the attaching / detaching device 100 according to the present invention will be described with reference to Figures 3 to 7B. As shown in Figure 3, the attaching / detaching device 100 includes a long plate-shaped base member 30 attached to the operating device 20, a pair of jack bolts 40 (such as hexagonal bolts) screwed into the base member 30, and a pair of support members 47 that support the jack bolts 40. The base member 30, the jack bolts 40, and the support members 47 form a separation section 2, which will be described in detail later.

[0033] As shown in Fig. 4 (a plan view seen from above in Fig. 3) and Fig. 5 (a longitudinal cross-sectional view taken along line AA in Fig. 4), a plurality of actuator screw holes 22 are formed in the upper plate 21b of the housing 21 of the actuator 20, and a plurality of mounting through holes 31 penetrating in the plate thickness direction are formed in the base member 30. The base member 30 is mounted on the actuator 20 by passing a plurality of mounting bolts 62 through the plurality of mounting through holes 31 from above and screwing them into the plurality of actuator screw holes 22.

[0034] At this time, the input shaft 24 of the actuator 20 is exposed above the base member 30 through a through hole 33 that penetrates the base member 30 in the plate thickness direction. A pair of jack screw holes 34 (an example of a screw hole) are formed in the base member 30 at both longitudinal ends thereof, sandwiching the through hole 33. Threaded ends 42 (an example of one end) of a pair of jack bolts 40 are screwed into the respective jack screw holes 34 from above, and the threaded ends 42 penetrate the base member 30 in the direction of the axis C. A pair of support members 47 are placed on the upper surface 19 (upper part) of the valve box 10. In this embodiment, the lower surface 49 of each support member 47 is formed with a curved surface that corresponds to the shape of the outer surface of the valve box 10 (see FIG. 3). This allows each support member 47 to be stably placed on the upper surface 19 of the valve box 10. The end face 43 of each jack bolt 40 that penetrates the base member 30 abuts against the upper surface 48 of each support member 47. In this embodiment, the support member 47 is placed on the upper surface 48 of the valve box 10, but in cases where the valve box 10 is buried underground, for example, the support member 47 may be placed on the ground (not shown) that covers the valve box 10.

[0035] As shown in FIG. 5 , each jack bolt 40 has double nuts 45 (part of the separation restriction portion 3) provided between the upper surface 35 (part of the separation restriction portion 3) of the base member 30 to which it is threaded and the bolt head 44 (an example of the other end portion). The double nuts 45 are fixed to the threaded portion 41 of the jack bolt 40 in an unrotatable manner by fastening the two nuts 45 facing each other vertically. A gap of a predetermined length L3 is provided between the lower surface 46 of the lower nut 45 of each fixed double nut 45 and the upper surface 35 of the base member 30 when the end face 43 of the jack bolt 40 abuts against the upper surface 48 of the support member 47. The predetermined length L3 is set to be less than the engagement length L1 (predetermined distance) between the convex spline 13 of the valve stem 12 and the concave spline 27 of the output shaft 26.

[0036] The sleeve 28 described above is exposed upward from the base member 30 at the top of the operating device 20 through a through-hole 33 in the base member 30. In other words, the sleeve 28 is visible from above the attachment / detachment device 100. The balloon in FIG. 5 is an enlarged view of the sleeve 28 as viewed from above. On the top surface of the sleeve 28, an open indicator 28b "O: Open" and a closed indicator 28c "S: Shut" are displayed to indicate the open / closed state of the valve disc 11. As shown in the figure, when the valve disc 11 is in the open state, the marking 24b on the input shaft 24 is positioned to face the open indicator 28b. On the other hand, when the valve disc 11 is in the closed state, the input shaft 24 rotates counterclockwise from the illustrated position around the axis C, and the marking 24b is positioned to face the closed indicator 28c (not shown).

[0037] As shown in Figures 5 and 6 (cross-sectional views taken along line BB in Figure 5), a two-flat width portion 17 is formed on the outer surface of the valve stem 12. As shown in the figures, the two-flat width portion 17 extends in a direction perpendicular to the valve body 11 in top view, and is formed as two opposing flat surfaces that sandwich the axis C. The width of the two-flat width portion 17 is set to a predetermined width W1 (see Figure 6). In this embodiment, the two-flat width portion 17 is formed, for example, in a range above the valve body flange 14 and below the convex spline 13 of the valve stem 12 on the outer surface of the valve stem 12.

[0038] Next, with reference to FIGS. 7A and 7B , the rotation restricting member 50 (part of the rotation restricting section 4) included in the configuration of the detaching / attaching device 100 will be described. As shown, the rotation restricting member 50 is a long plate-shaped member having a rectangular notch 51 that opens at one end in the longitudinal direction and penetrates the plate in the thickness direction. The notch 51 defines a narrow portion 53 and a wide portion 54 in the width direction of the rotation restricting member 50. The width of the notch 51 is approximately the same length as the width (predetermined width W1) of the width-across-flat portion 17 of the valve stem 12 described above. As will be described in detail later, during the attachment / detachment process, the rotation restricting member 50 is placed on the valve body flange 14 as shown by the imaginary lines, and the notch 51 clamps the width-across-flat portion 17 of the valve stem 12. At this time, the width W2 of the narrow portion 53 is set so that the rotation restricting member 50 does not overlap the fastening screw hole 18 on the valve body flange 14. On the other hand, the width W3 of the wide portion 54 is set so that the rotation restricting member 50 overlaps the fastening screw hole 18. A restricting member through-hole 55 is formed in the wide portion 54 at a position corresponding to the fastening screw hole 18 when the rotation restricting member 50 overlaps the fastening screw hole 18.

[0039] As shown in Fig. 7A, the rotation restricting member 50 is provided with a restricting member open / closed indicator 58 on its upper surface, which indicates the open / closed state of the valve disc 11. Specifically, the restricting member open / closed indicator 58 includes a restricting member open indicator 58b that indicates the open state of the valve disc 11, which reads "O: Open," and a restricting member closed indicator 58c that indicates the closed state of the valve disc 11, which reads "S: Shut." The restricting member open indicator 58b is provided in the longitudinal direction of the cutout 51 and is located outside the outer diameter of the actuator flange 23 in the plan view of Fig. 7A. The restricting member closed indicator 58c is provided on the open end side of the cutout 51 in the wide portion 54, and is also located outside the outer diameter of the actuator flange 23 in the plan view of Fig. 7A.

[0040] [Detaching method using detachment device 100] Next, with reference to Figures 8 to 15, a method for attaching and detaching the actuator 20 using the above-described detachment device 100 will be described. First, as shown in Figures 8 and 9 (cross-sectional views taken along line BB in Figure 8), of the fastening bolts 61 (see Figures 5 and 6) fastening the actuator flange 23 of the actuator 20 to the valve box flange 14 of the valve box 10, the two on the left side in the figures are removed, and two threaded bolts 63 are threaded into the fastening screw holes 18 in place of the fastening bolts 61 and temporarily fastened. The threaded bolts 63 are bolts that do not have bolt heads and only have threads. Then, as shown in Figure 8, of the fastening bolts 61, the two on the right side in the figure are loosened, and a gap of approximately the same length as the above-described predetermined length L3 (see Figure 8) is provided between the underside 61b of the head of the fastening bolt 61 and the upper surface 23b of the actuator flange 23. In other words, the fastening between the actuator flange 23 and the valve box flange 14 is released, and the actuator 20 becomes capable of being separated from the valve box 10.

[0041] Then, when the bolt head 44 of the jack bolt 40 is screwed in (arrow D2), the end face 43 of the threaded end 42 presses against the upper surface 48 of the support member 47, and a downward acting force F1 acts on the upper surface 48 of the support member 47. At this time, an acting force F2 acts upward on the mounting bolt 62 via the base member 30 as a reaction force to the acting force F1. As a result, the upward acting force F2 is applied to the actuator 20 fastened to the base member 30 as a separating force. In other words, the base member 30, the jack bolt 40, and the support member 47 form a jack mechanism, which constitutes a separating unit 2 that separates the actuator 20 from the valve box 10 in the direction of the axis C. As a result, the actuator 20, to which the separating force is applied, gradually separates upward.

[0042] As the actuator 20 moves away from the valve box 10, the upper surface 35 of the base member 30 and the lower surface 46 of the lower nut 45 of the double nuts 45, 45 approach each other. Then, as shown in FIG. 10 , the upper surface 35 of the base member 30 comes into contact with the lower surface 46 of the double nuts 45, 45, restricting further screwing of the jack bolt 40 into the base member 30. That is, the base member 30 ends up raised by a predetermined length L3. At this time, as shown in the figure, the actuator 20 is spaced apart from the valve box 10 by the predetermined length L3. In other words, the upper surface 35 of the base member 30 and the double nuts 45, 45 form a separation restriction unit 3 that restricts the amount of separation of the actuator 20 to less than the predetermined length L3. This forms a separation space S (an example of a gap) between the lower surface of the actuator flange 23 and the upper surface of the valve box flange 14. At this time, the engagement length L2 between the valve stem 12 and the output shaft 26 becomes equal to the difference between the engagement length L1 before separation (see FIG. 8) and the predetermined length L3. In other words, because the predetermined length L3 is configured to be less than the engagement length L1 before separation, the engagement between the valve stem 12 and the output shaft 26 is maintained even after separation. In this state, as shown by the imaginary lines, the temporarily fixed threaded bolts 63 and fastening bolts 61 are all removed.

[0043] As shown in Fig. 8, as the actuator 20 moves away from the valve box 10, the upper surface 23b of the actuator flange 23 and the lower surface 61b of the fastening bolt 61 move closer to each other. Then, as shown in Fig. 10, the upper surface 23b of the actuator flange 23 and the lower surface 61b of the fastening bolt 61 come into contact with each other, restricting the subsequent screwing of the jack bolt 40 into the base member 30. That is, the base member 30 ends up raised by a predetermined length L3. In other words, by setting a gap of the predetermined length L3 between the upper surface 23b of the actuator flange 23 and the lower surface 61b of the fastening bolt 61, the upper surface 23b of the actuator flange 23 and the lower surface 61b of the fastening bolt 61 secondarily restrict the amount of separation of the actuator 20 to less than the predetermined length L3. In this embodiment, the separation restriction portion 3 is composed of the upper surface 35 of the base member 30 and the double nuts 45, 45, but the separation restriction portion 3 may also be composed of only the upper surface 23b of the operating device flange 23 and the fastening bolt 61.

[0044] 11 (a cross-sectional view taken along line BB in FIG. 10), the rotation restricting member 50 is inserted horizontally into the formed separation space S from the open end side of the cutout portion 51. Part X in FIG. 11 partially shows a plan view of the attachment / detachment device 100 as seen from above, and the balloon in FIG. 11 is an enlarged view of part X. In this embodiment, the insertion direction D3 of the rotation restricting member 50 is indicated by the open / closed indicators of the sleeve 28 (open indicator 28b, closed indicator 28c) shown in the balloon and the restricting member open / closed indicators 58 of the rotation restricting member 50 (restricting member open indicator 58b, restricting member closed indicator 58c). Specifically, the direction in which the relative positional relationship between the open indicator 28b and the closed indicator 28c in the horizontal direction D4 corresponds to the relative positional relationship between the restricting member open indicator 58b and the restricting member closed indicator 58c in the horizontal direction D4 (i.e., in FIG. 11, the direction in which the closed indicator 28c and the restricting member closed indicator 58c are displayed to the left of the open indicator 28b and the restricting member open indicator 58b in the same figure) is displayed as the insertion direction D3. The rotation restricting member 50 is then inserted into the separated space S according to the insertion direction D3. As a result, the notch 51 of the rotation restricting member 50 sandwiches the two-flat portion 17 of the valve stem 12. The width of the notch 51 and the width of the two-flat portion 17 are set to be substantially the same length (W1) (see FIGS. 6 and 7), so the notch 51 sandwiches the two-flat portion 17 with almost no gap.

[0045] 12 and 13, the threaded bolts 63 are again screwed into the two fastening screw holes 18 on the left side of the figures, which are located at positions corresponding to the restricting member through holes 55 of the rotation restricting member 50. As a result, the rotation restricting member 50 engages with the valve body flange 14 at two points about the axis C, restricting rotation of the rotation restricting member 50 about the axis C relative to the valve body 10. Note that movement of the rotation restricting member 50 in the horizontal direction D4 is also restricted at the same time, preventing the rotation restricting member 50 from unintentionally falling out of the separation space S. Furthermore, after the rotation restricting member 50 is inserted, the notch 51 clamps the width-across-flat portion 17 of the valve stem 12, restricting rotation of the valve stem 12 about the axis C relative to the rotation restricting member 50. That is, the rotation restricting member 50, the fastening screw hole 18 of the valve body flange 14, and the cut bolt 63 constitute the rotation restricting section 4, which restricts the rotation of the valve stem 12 about the axis C relative to the valve body 10. Therefore, the detaching device 100 can remove the actuator 20 while keeping the valve disc 11 in the open state, as shown in Figure 14.

[0046] 15 and 16, for example, a new actuator 20n is attached to the valve box 10, and the output shaft 26 of the new actuator 20n is engaged with the valve stem 12. At this time, as shown in the balloon (partially enlarged view) of FIG. 16, it is first confirmed that the marking 24b on the input shaft 24 of the new actuator 20n is positioned opposite the open indicator 28b. If the marking 24b is not positioned opposite the open indicator 28b, the input shaft 24 of the new actuator 20n is rotated so that they are positioned opposite each other. Next, a new actuator 20n is attached to the valve box 10 in an arrangement in which the relative positional relationship in the horizontal direction D4 of the open indicator 28b and the close indicator 28c corresponds to the relative positional relationship in the horizontal direction D4 of the restriction member open indicator 58b and the restriction member close indicator 58c (i.e., in FIG. 16, the close indicator 28c and the restriction member close indicator 58c are displayed to the left of the open indicator 28b and the restriction member open indicator 58b in the same figure). At this time, because the restriction member open / closed indicators 58b, 58c are provided on the rotation restricting member 50 outside the outer diameter of the actuator flange 23 in a plan view (see FIG. 7A), the restriction member open / closed indicators 58b, 58c can be seen from above without being hidden by the new actuator 20n.

[0047] As a result, the detachment device 100 can attach the new actuator 20n to the valve box 10 in the correct position without rotating the new actuator 20n, for example, around the axis C, and attaching it in the wrong direction. Therefore, the detachment device 100 can reliably return the valve device 1 to the state it was in before the actuator 20 was removed. Note that, as shown in Figures 15 and 16, the new actuator 20n may be attached to the valve box 10 while attached to the jack mechanisms 30, 40.

[0048] When the new actuator 20n is attached to the valve body 10, the output shaft 26 of the new actuator 20n restricts the rotation of the valve stem 12. Then, as shown by the phantom line in Figure 15, the threaded bolt 63 that was temporarily fastened is removed. Then, as shown in Figure 17, the mounting bolt 62 is threaded into the fastening screw hole 18, thereby fastening the new actuator 20n to the valve body flange 14 and completing the attachment and detachment work. [About the effects]

[0049] As described above, in the detaching device 100, when a rotational force is applied to each bolt head 44 of a pair of jack bolts 40 by the jack mechanism in the separating section 2, an action force F2 in the direction of the axis C is applied to the actuator 20 via the base member 30 as a separating force, with the end face 43 at which the support member 47 supports the jack bolt 40 as a fulcrum. In other words, by having a screw-type jack mechanism, the detaching device 100 can efficiently convert the rotational force applied to the jack bolt 40 into a separating force with a simple configuration, thereby gradually separating the actuator 20 from the valve box 10. This allows the detaching device 100 to easily and inexpensively manage the amount of separation of the actuator 20 in the direction of the axis C to maintain the engagement between the valve stem 12 and the actuator 20.

[0050] Furthermore, when separating the actuator 20 from the valve box 10, the detaching device 100 restricts the amount of separation of the actuator 20 by the separation restriction unit 3 so that it does not exceed a predetermined length L3. The predetermined length L3 is set so that the amount of separation is less than the engagement length L1 between the valve stem 12 and the actuator 20. In other words, the detaching device 100 restricts the amount of separation of the actuator 20 by the separation restriction unit 3 so that it is less than the engagement length L1. This prevents the detaching device 100 from accidentally releasing the engagement between the valve stem 12 and the actuator 20 due to the amount of separation between the valve stem 12 and the actuator 20 becoming too large, even when a large force is applied to the actuator 20 to separate them during detachment work. Therefore, the detaching device 100 maintains the engagement between the valve stem 12 and the output shaft 26 of the actuator 20, allowing detachment work to be performed while maintaining the water flow state (the open state of the valve disc 11).

[0051] Furthermore, the detaching device 100 inserts the rotation restricting member 50 into the separated space S so that the positions of the open / close indicators 28b, 28c of the actuator 20 correspond to the positions of the restricting member open / close indicators 58b, 58c. Therefore, when attaching a new actuator 20n after the actuator 20 has been removed, the detaching device 100 can accurately attach the new actuator 20n to the valve box 10 by aligning the positions of the open / close indicators 28b, 28c of the new actuator 20n with the positions of the restricting member open / close indicators 58b, 58c. Therefore, the detaching device 100 can reliably restore the valve device 1 to the state it was in before the actuator 20 was removed, even in a work environment with a narrow working space and poor visibility.

[0052] As an effect of the above, the detachment device 100 can improve the workability of the detachment work when attaching and detaching the operating device 20 from the valve box 10 in the valve device 1, thereby enabling the operating device 20 to be attached and detached properly.

[0053] <Embodiments 2 and 3> 18A and 18B, a rotation restricting member 250 in an attachment / detachment device 200 according to the second embodiment of the present invention will be described. As shown in the figures, the width W4 of the wide portion 254 of the rotation restricting member 250 is set to be approximately the same as the maximum length L4 in the horizontal direction D4 between the inner tangents of the two fastening screw holes 18 and the two-flat width portion 17. As in the case of the first embodiment, by inserting the rotation restricting member 250 into the separation space S (see FIG. 10), the notched portions 51 sandwich and engage with the two-flat width portion 17 (first engagement portion), thereby restricting rotation of the valve stem 12 relative to the rotation restricting member 250.

[0054] At this time, as shown by the imaginary lines, the cut bolts 63 are threaded into two fastening screw holes 18 arranged on the outside of the wide portion 254 of the rotation restricting member 250. The wide portion 254 of the rotation restricting member 250 is sandwiched and engaged between the two-face width portion 17 and the outer surfaces of the two cut bolts 63 (second engagement portion), restricting rotation of the rotation restricting member 250 relative to the valve body 10. Therefore, similar to the case of embodiment 1, the attachment / detachment device 200 can restrict rotation of the valve stem 12 about the axis C relative to the valve body 10.

[0055] As shown in the figure, the rotation restricting member 250 may have a retaining hole 59 formed in the wide portion 253 and / or the narrow portion 53, outside the outer diameter of the valve body flange 14. By threading a retaining bolt 65, for example, into the retaining hole 59, the detaching device 200 restricts movement of the rotation restricting member 250 inserted into the separation space S in the horizontal direction D4, thereby preventing the rotation restricting member 250 from coming off. Furthermore, as shown in the figure, if the valve body flange 14 has a vertical step 14b or the like formed to be convex upward, the rotation restricting member 250 may have a step 51b formed on its underside that is concave upward at a position corresponding to the step 14b.

[0056] Next, with reference to Fig. 19, the support member 347 in the detaching device 300 according to the third embodiment of the present invention will be described. As shown in the figure, the valve device 1 may be buried in the ground, for example, tilted by θ [°] with respect to the horizontal direction D4. In this case, the pair of support members 347 may be configured so that the lower surface 349 of each support member 347 is tilted by θ [°] with respect to the horizontal direction D4. As a result, the acting force F1 from the jack bolt 40 and the acting force F2 as its reaction force are applied in a direction parallel to the axis C. Therefore, the detaching device 300 can separate the actuator 20 from the valve box 10 along the direction of the axis C.

[0057] In the embodiment described above, the open / close indicators 28b, 28c and the regulating member open / close indicators 58b, 58c are configured as "O" and "S", but the open / close indicators 28b, 28c and the regulating member open / close indicators 58b, 58c may be configured using other symbols that indicate the open / closed state of the valve body 11, such as "open" and "closed".

[0058] Furthermore, in the embodiment described above, the separation restriction unit 3 is configured using double nuts 5, 5, but the separation restriction unit 3 may be configured using something other than double nuts 5, 5, and may be configured, for example, using a member such as a retaining ring fixed to the threaded portion 41 of the jack bolt 40. Furthermore, the separation restriction unit 3 may be configured without using double nuts 5, 5, and using only a jack bolt 40 of a predetermined length such that the distance between the bottom surface of the bolt head 44 and the top surface 35 of the base member 30 is a predetermined length L3 in the state shown in FIG.

[0059] In the embodiment described above, the jack mechanism is configured to move the base member 30 upward by alternately rotating each of the pair of jack bolts 40. However, the jack mechanism may be configured such that, for example, the pair of jack bolts 40 are connected by a linkage mechanism or the like so that they rotate in conjunction with each other, and rotating one jack bolt 40 causes the other jack bolt 40 to rotate in conjunction with each other. The linkage mechanism may be configured, for example, by pulleys provided on the same axis of each jack bolt 40 and belts wound around each pulley. In this way, the base member 30 can be moved upward by rotating only one of the jack bolts 40.

[0060] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments and can be embodied in various forms without departing from the spirit and scope of the present invention. The drawings mainly show each component in a schematic manner for ease of understanding, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of creating the drawings. Furthermore, the materials, shapes, dimensions, etc. of each component shown in the above embodiments are merely examples and are not particularly limited, and various modifications are possible within a scope that does not substantially deviate from the configuration of the present invention. [Explanation of symbols]

[0061] S Separate space 1 Valve device 2 Separation part 3. Separation control section 4 Rotation restriction part 10 Valve box 11 Valve body 12 Valve stem 13 Convex splines 14 Valve body flange 17 Width across flats 18 Fastening screw holes 20 Control device 21 Housing 23 Operating device flange 24 input shaft 25 Reduction mechanism 26 Output shaft 27 Concave spline 28 Sleeve (open / closed) 28b Open display 28c Closed display 30 Base member 40 Jack bolt 42 Thread end (one end) 44 Bolt head (other end) 45 Double nut (part of the separation control member) 47 Support member 50 Rotation restriction member 55 Rotating through hole 58 Marking (regulatory component open / close indication) 58b Restriction member opening display 58c Regulatory member closed display 61 Fastening bolt 62 Mounting bolt 63 Threaded bolt 100 Detachable device

Claims

1. a valve body into which a valve stem is inserted and which opens and closes an internal space of a valve body by rotating the valve stem about an axis; An actuator that is attached to a valve body and rotates an output shaft that is axially fitted with and engaged with a valve stem around the axis, thereby opening and closing a valve element, An operating device that displays the open / closed state of the valve disc; In a valve device equipped with the above, a detachment device for attaching and detaching an actuator from a valve body, a separation section that separates the actuator from the valve body in the axial direction to form a space between the valve body and the actuator; a separation restriction unit that restricts the distance by which the operating device is separated by the separation unit to less than a predetermined distance; a rotation restricting member inserted into the space to restrict rotation of the valve stem relative to the valve body about its axis; Equipped with The predetermined distance is an axial fitting length between the valve stem and the output shaft, The rotation restricting member has a restricting member open / close indicator indicating the open / close state of the valve body, The insertion direction of the rotation restricting member into the space is a direction in which the position of the open / closed indicator corresponds to the position of the restricting member open / closed indicator.

2. The rotation restricting member is a first engagement portion that engages with the valve stem and a second engagement portion that engages with the valve body; the first engagement portion restricts rotation of the valve stem about the axis relative to the rotation restriction portion; The detaching device according to claim 1 , wherein the second engagement portion restricts rotation of the rotation restricting portion relative to the valve body about the axis.

3. The open / close indicator displays an open indicator indicating an open state of the valve disc and a closed indicator indicating a closed state of the valve disc, The restriction member open / closed indicator displays a restriction member open indicator indicating an open state of the valve body and a restriction member closed indicator indicating a closed state of the valve body; The insertion direction is a direction in which a relative positional relationship between the open indicator and the closed indicator corresponds to a relative positional relationship between the regulating member open indicator and the regulating member closed indicator. The detachment device according to claim 1 .

4. The separation portion is a plate-shaped base member connected to the operating device; a jack mechanism that moves the base member in the axial direction; The detachment device according to any one of claims 1 to 3, comprising:

5. The jack mechanism is a pair of jack bolts each having one end penetrating the base member from above in the axial direction by being threaded into a pair of screw holes formed at both ends of the base member; A pair of support members are provided on the upper part of the valve box and support one end of each of the pair of jack bolts. The detachment device according to claim 4 , further comprising:

6. The separation restriction portion is A separation restriction member is provided on each of the pair of jack bolts, 6. The attachment / detachment device according to claim 5, wherein the separation restriction members are provided in a range such that the distance between a lower surface of the separation restriction member and an upper surface of the base member that screws onto each jack bolt is less than the predetermined distance.

7. a valve body into which a valve stem is inserted and which opens and closes an internal space of a valve body by rotating the valve stem about an axis; An actuator that is attached to a valve body and rotates an output shaft that is axially fitted with and engaged with a valve stem around the axis, thereby opening and closing a valve element, An operating device that displays the open / closed state of the valve disc; A method for attaching and detaching an actuator from a valve body in a valve device comprising: a step of separating the actuator from the valve body in the axial direction to form a space between the valve body and the actuator; a step of inserting a rotation restricting member into the space to restrict rotation of the valve stem about the axis relative to the valve body; Equipped with In the step of separating the actuator from the valve body in the axial direction, The distance by which the actuator is separated is regulated to be less than the fitting length between the valve stem and the output shaft in the axial direction, The rotation restricting member has a restricting member open / close indicator indicating the open / close state of the valve body, The insertion direction of the rotation restricting member into the space is indicated as a direction in which the position of the open / close indicator corresponds to the position of the restricting member open / close indicator.

Images