JP7288485B2 - How to install the valve body - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device that cuts a fluid pipe with a cylindrical cutter in a housing that hermetically surrounds the fluid pipe and that can be mounted in the housing in a non-interrupted state.

In a conventional valve device in which a fluid pipe is cut by a cylindrical cutter in a casing that seals the fluid pipe and can be mounted in the casing in a non-interrupted state, in order to reduce the size and weight of the casing, The fluid pipe is cut with a cylindrical cutter having a diameter as small as possible, the valve body is directly inserted into the housing, and the housing is blocked by the valve body to control the flow in the fluid pipe.
(See Patent Document 1, for example).

Japanese translation of PCT publication No. 2006-515406 (page 6, Figures 1-5)

In Patent Document 1, since the fluid pipe is cut using a small-diameter cylindrical cutter, the separation distance of the portion where the cut surface of the fluid pipe comes closest becomes small, and the valve body can be directly attached to the housing. I had to insert it. However, if the valve body is directly inserted into the housing, the turbulence of the fluid flowing in the housing increases, resulting in an increase in pressure loss. There is also a risk that the reliability of the system will decrease.

The present invention has been made with a focus on such problems, and the fluid pipe is cut by a cylindrical cutter in a housing that seals the fluid pipe, and the fluid is inserted into the housing in a non-interrupted state. An object of the present invention is to provide a method for installing a valve body that can be attached and which has high long-term reliability.

In the case of the present invention, the case is filled with clean water by cutting the case with a cylindrical rotatable cutter in a non-interrupted state in a case of a divided structure that encloses the water pipe in a sealed manner, and the water pipe is filled in the case. A method for installing a valve body, wherein the valve body is inserted by a valve body insertion device into a spaced apart portion between the cut surfaces of the water pipe formed in an arc shape,
The valve main body includes a valve body, a valve operating shaft connected to the upper portion of the valve body and configured to move the valve body by rotating an operating portion at the upper end, a valve seat body having a valve seat hole, a valve cover for closing a housing opening of the housing; a sealing member for sealing between the valve seat body and the housing; a protruding portion having a portion, wherein the valve body can open and close the valve seat hole by being inserted downward from the accommodating portion toward the valve seat body installed in the housing. The valve body insertion device includes an insertion device housing connected to the housing, an insertion shaft that can advance and retreat with respect to the insertion device housing, and a holding portion provided at one end of the insertion shaft. and inserting the valve body into the housing with the holding part below the operating part at the upper end of the valve operating shaft in the valve body and holding the projecting part, The valve body is installed so that the bottom of the valve body is in contact with the bowl-shaped housing bottom of the housing, and in a state where the holding section holds the protruding section of the valve body, below the holding section A press screw provided on the housing side is screwed in, and the outer peripheral portion of the valve body is fixed by the press screw.

The holding portion is characterized in that it extends downward so as to straddle the valve operation shaft.

After inserting the valve body into the housing, the insertion shaft and the holding portion are removed through a working hole formed in the insertion device housing so as to be openable and closable.

The removal work is characterized in that it is a work of removing a mounting bolt that connects the insertion shaft and the holding portion.

After the removal work, the insertion device housing and the insertion shaft are removed, and the holding portion is removed from the valve body.

FIG. 4 is a partial front cross-sectional view showing a state in which the fluid pipe cutting device is installed in a housing attached to an existing fluid pipe; FIG. 2 is a partial cross-sectional view taken along the arrow A in FIG. 1; FIG. 4 is a partial front cross-sectional view showing a state in which the valve body is installed in the housing by the valve body insertion device; (a) is a view taken along the line BB in FIG. 3, showing a state in which the valve cover is temporarily fixed by a pressing screw, and (b) is a view showing a state in which the temporary fixing of the pressing screw is released. It is a partial front cross-sectional view showing a process of installing the valve body in the housing and inserting the fixing member into the recess. (a) is a plan view showing a state in which the fixing member is inserted into the housing recess, and (b) is a partial front cross-sectional view. It is a figure which shows the process of attaching a top cover to a flange part. (a) is a plan view showing a state in which the upper lid is attached to the flange portion and the installation body attachment step is completed, and (b) is a partial front cross-sectional view. FIG. 4 is a diagram showing the dimensional relationship between the valve seat body of the valve device and the cut surface of the existing fluid pipe;

A valve device according to the present invention will be described with reference to FIGS. 1 to 9. FIG.

As shown in FIGS. 1 to 5, a valve device 1 according to the present invention includes a housing 4 that sealingly encloses an existing fluid pipe 2, and a valve body 5 as an insert that can be inserted into the housing 4. , have The valve body 5 includes a valve lid 5a that closes the housing opening 41d of the housing 4, a valve seat body 5b that has a valve seat hole 5f, a valve body 5v that opens and closes the valve seat hole 5f, and an upper portion of the valve body 5v. It has a valve operating shaft 5j connected to. Further, the valve device 1 includes a packing housed in a packing box 5h and sealing the valve operating shaft 5j, a packing (not shown) sealing between the valve body 5v and the valve seat body 5b, and a valve seat body 5b and the housing. A sealing member 5e for sealing between the body 4 is provided. The valve device 1 is hermetically inserted into the housing 4, rotates the valve operation shaft 5j, and moves the valve body 5v, thereby moving the valve body 5v into the valve seat hole provided in the valve seat body 5b. The flow of the existing fluid pipe 2 can be controlled by opening and closing 5f. However, the sealing between the valve body 5v and the valve seat body 5b is not limited to packing, and may be, for example, metal-to-metal sealing.

Here, the existing fluid pipe 2 is made of, for example, ductile cast iron for water supply buried in the ground, is formed in a substantially circular shape in cross section, and has an inner peripheral surface coated with an epoxy resin layer. In addition, the fluid pipe according to the present invention may be made of metal such as cast iron or steel, or may be made of asbestos, concrete, vinyl chloride, polyethylene or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the epoxy resin layer, and may be coated with, for example, mortar or the like, or the inner peripheral surface of the fluid pipe may be coated with a suitable material by powder coating. In this embodiment, the fluid in the fluid pipe is tap water, but it is not limited to tap water in this embodiment. It doesn't matter if it is. Further, the materials of the housing 4 and the valve body 5 may also conform to the above.

As shown in FIG. 1, the housing 4 attached to the outer peripheral surface of the existing fluid pipe 2 is a so-called split T-shaped pipe, and the housing extends in the radial direction of the existing fluid pipe 2 (vertical direction in this embodiment). It has a structure divided into an upper part 41 and a housing lower part 42 . Further, the housing 4 is provided with detachment prevention fittings 6, 6 for preventing detachment of the existing fluid pipe 2. As shown in FIG.

A housing upper portion 41 is formed with a neck portion 41a, a flange portion 41b connected to the neck portion 41a, and a housing opening portion 41d connected to the flange portion 41b and communicating with the inside of the housing. is formed with a housing recess 41c into which a fixing member 7, which will be described later, is inserted and fixed. A fluid pipe cutting device 70, a valve body inserting device 80 (see FIG. 3), and the like can be attached to the flange portion 41b through a fixed flange body 50 and a work valve 60, which will be described later.

On the other hand, the housing lower portion 42 has a bowl-shaped housing bottom portion 42d, and a discharge hole 42b is formed in the center of the housing bottom portion 42d. A valve 49 can be connected to the discharge hole 42b, and as will be described later, chips generated when the existing fluid pipe 2 is cut can be discharged together with the fluid from the discharge hole 42b by operating the valve 49. there is

In the present embodiment, the upper part 41, the lower part 42, etc. will be referred to, but the direction in which the housing is divided is not limited to the top and bottom, and may be, for example, a horizontal direction or an inclined direction at a predetermined angle. Also, the number of divisions may be 3 or more. Similarly, the piping direction of the existing fluid pipe 2 is not limited to horizontal, and may be, for example, vertical. Furthermore, the cutting direction of the cutter 72, which will be described later, is not limited to the vertical direction, and may be, for example, the horizontal direction. In the following embodiments, the cutter 72 will be described as an example of using a cylindrical cutter such as a hole saw with good working efficiency, but a wire saw, a cutting tool, or the like may also be used.

The fixed flange main body 50, the working valve main body 60, and the fluid pipe cutting device 70 will be described below. As shown in FIG. 1, in a state in which the housing 4 is hermetically attached to the existing fluid pipe 2, a fixed flange main body 50, a work valve main body 60 and a fluid pipe cutting device 70 are attached to the flange portion 41b of the upper housing portion 41. is attached.

As shown in FIGS. 1 and 2, a seal member 53 is interposed between the joint surfaces of the fixed flange portion 51 and the flange portion 41b of the fixed flange body 50, and tightened by bolts and nuts 54. The fixed flange portion 51 and the flange portion 41b are sealed. In the radial direction of the fixed flange portion 51, a plurality of cap screws 52 are hermetically attached at predetermined intervals in the circumferential direction. , the valve body 5 can be temporarily fixed.

As shown in FIG. 1, a joint surface between the working valve housing 61 of the working valve main body 60 and the fixed flange main body 50 is interposed with a sealing member 63 and tightened with bolts 55, so that the working valve main body 60 and the fixed flange main body 50 are tightened. 50 is sealed. A work valve 62 is hermetically attached to the work valve housing 61 of the work valve main body 60 so as to freely open and close between the housing 4 and the fluid pipe cutting device 70 by sliding in the horizontal direction.

A seal member 73 is inserted in the joint surface between the fluid pipe disconnecting device 70 and the working valve main body 60 and tightened by a bolt 74, so that the fluid pipe cutting device 70 and the working valve main body 60 are sealed. be. Further, a cutter 72 attached to a cutter shaft 75 is hermetically attached to the punching device housing 71 so as to be vertically movable and rotatable. The cutter 72 and the cutter shaft 75 can be rotationally driven from the outside of the fluid tube cutting device 70 by a driving device (not shown).

The process of cutting the existing fluid pipe 2 and the process of mounting the valve body 5 will be described below.

First, the cutting process will be explained. As shown in FIG. 1, the existing fluid pipe 2 is cut by the cutter 72 while the working valve 62 is open. Since the cutter 72 has a cylindrical shape, the pipe cutting portion of the existing fluid pipe 2 is formed in an arc shape along the cylindrical cutter 72 when viewed from the direction of the cutter shaft 75 . Chips generated when cutting the existing fluid pipe 2 operate a valve 49 attached to a discharge hole 42b provided in the center of the lower housing 42 to discharge the chips together with the fluid.

After cutting the existing fluid pipe 2 , the cutter 72 is raised to close the working valve 62 of the working valve housing 61 and seal the space between the housing 4 and the fluid pipe cutting device 70 . After that, the fluid in the fluid pipe cutting device 70 is discharged, the fluid pipe cutting device 70 is removed from the working valve main body 60, and the cutting step of the existing fluid pipe 2 is finished.

Next, as shown in FIG. 3, the valve body inserting device 80 is hermetically attached to the upper portion of the working valve body 60 . This valve body insertion device 80 includes an insertion device housing 86, an insertion shaft 87, and a holding portion 83 for holding the valve body 5 is attached to one end of the insertion shaft 87 by a mounting bolt 88. A threaded portion 89 screwed into the insertion shaft 87 and a handle 90 for rotating the threaded portion 89 are provided at the end of the valve body 5 . can be inserted into and removed from the housing 4 .

When the handle 90 is rotated to lower the insertion shaft 87 and the valve body 5 with the fixing members 7, 7 installed is inserted into the housing 4 and installed, as shown in FIG. A cap screw 52 provided on the flange body 50 is screwed in, and the cap sloping surface 5 c formed on the outer peripheral portion of the valve cap 5 a of the valve body 5 is temporarily fixed by the cap screw 52 . After that, the fluid in the valve body insertion device 80 is discharged, the insertion device cover 84 is removed, the mounting bolt 88 connecting the holding portion 83 and the insertion shaft 87 is removed from the work hole 85, and the valve body insertion device 80 is put into operation. After removing from the valve body 60, the holding portion 83 of the valve body insertion device 80 is removed from the valve body 5 (see FIG. 3).

Next, as shown in FIG. 5, when the valve body inserting device 80 is removed from the working valve body 60, it is fixed in a substantially rectangular shape in a plan view to a housing recess 41c formed in the housing upper part 41, which will be described later. Mount the members 7,7. By attaching the fixing member 7 so as to straddle the valve cover 5a and the housing recess 41c, the fixing member 7 can hold the fluid force applied to the valve cover 5a. At this time, the work space inside 61b of the work valve housing 61 is narrow due to the presence of the packing box 5h and the like. The distance makes it difficult to insert the fixing member 7 . Therefore, by inserting the work jig 92 between the valve cover 5a and the fixing member 7, the fixing member 7 can be inserted into the housing concave portion 41c. As shown in FIGS. 5 and 6, the fixing member 7 is provided with a tapered portion 7d so that the working jig 92 can be easily inserted even in a narrow working space. Further, the fixing member 7 is provided with a plurality of holes 7e, 7e. By inserting a work jig (not shown) into the holes 7e, 7e, it is possible not only to insert the fixing member 7 into the housing recess 41c even if the work space is narrow, but also to remove the fixing member 7 from the housing recess 41c. Can be easily removed.

Subsequently, as shown in FIG. 6, the fixing members 7, 7 are locked with a plurality of bolts 7a, 7a. After that, the holding screw 52 is loosened (see FIG. 4(b)), and the fixed flange main body 50 and the working valve main body 60 are removed. Since the fixed flange main body 50 can be removed in this way, the fixed flange main body 50 and the plurality of holding screws 52 provided on the fixed flange main body 50 remain in the housing 4, and the structure of the installation body can be improved without deterioration over time. Not only can it be simple, but the fixed flange main body 50 and the plurality of retaining screws 52 that have been removed can be attached to another housing and reused.

Finally, as shown in FIGS. 7 and 8, the upper cover 43 is attached to the flange portion 41b with bolts and nuts 43b, completing the installation process. An upper lid convex portion 43 a for holding the fixing member 7 is provided at a position where the upper lid 43 faces the fixing member 7 . Since the fixing member 7 is also held by the upper cover convex portion 43a in a state in which the upper cover 43 is tightened to the flange portion 41b by the bolts and nuts 43b, the pressure applied to the fixing member 7 can be reduced. The upper lid 43 is formed with an upper lid convex portion 43c so as to hold not only the fixing member 7 but also the valve lid 5a, but this may be omitted.

The effects of the valve device 1 according to the present invention will be described below. As shown in FIG. 9, the valve body 5 can be cut by a cylindrical cutter 72 in the housing 4 that hermetically surrounds the existing fluid pipe 2 and can be inserted into the housing 4 in a non-interrupted state. It is configured.

Here, when the existing fluid pipe 2 is cut in the radial direction by the cylindrical cutter 72, as shown in FIG. is the maximum at the top and bottom of the existing fluid pipe 2, and becomes the minimum separation distance L1 at a substantially intermediate position between the top and bottom of the existing fluid pipe 2. The size of the valve seat body 5b and the valve body 5v of the valve device 1 that can be inserted into the housing 4 is determined by this minimum distance L1.

For example, when the width of the valve seat body 5b in the pipe axis direction is large, the existing fluid pipe 2 is cut with a cutter 72 having a large diameter so that the valve seat body 5b can pass through while ensuring the minimum separation distance L1. need to be However, in order to cut the existing fluid pipe 2 with the cutter 72 having a large diameter, it is necessary to increase the size of the housing 4 that sealingly surrounds the existing fluid pipe 2 . As a result, the cost of the valve device 1 increases, and the amount of earth and sand excavated for burying the large valve device 1 also increases, so the installation cost also increases. In addition, as the housing 4 becomes larger, the surface area of the valve body 5 inserted into the housing also becomes larger, so the force acting on the valve body 5 by the fluid also increases, and it becomes necessary to further reinforce the valve seat body 5b. The cost of the device 1 also increases more and more.

On the contrary, if the housing 4 sealingly surrounding the existing fluid pipe 2 is made small and the existing fluid pipe 2 is cut by a cylindrical cutter 72 with a small diameter, the minimum separation distance L1 will also become small, so the valve seat body 5b, It is necessary to make the valve body 5v thin. As a result, the structural strength of the valve seat body 5b and the valve body 5v is restricted to be low, and long-term reliability is lowered.

Therefore, in the valve device 1 of the present invention, as shown in FIG. By forming and downsizing the housing 4, the valve seat body 5b and the valve body 5v can also be downsized. By reducing the size of the housing 4, the cost of the valve device 1 and the installation cost of the valve device 1 can be reduced. can reduce the force applied to

On the other hand, since the valve seat body 5b and the valve body 5v are in a cantilever state, by making the housing 4 smaller, the structural strength of the valve seat body 5b and the valve body 5v is restricted to be low. Therefore, in order to withstand the high stress generated in the valve seat body 5b and the valve body 5v, the valve seat body 5b faces the fluid pipe cut surface 2a and tapers in the direction in which the valve seat body 5b is inserted. An inclined valve seat body inclined surface 5q is provided, and the pipe axial width L3 of the valve seat body 5b on the proximal end side is made smaller than the pipe axial direction width L2 of the valve seat body 5b at the position closest to the fluid pipe cut surface 2a. Enlarging and forming. Similarly, the valve body 5v has a valve body inclined surface 5r that faces the valve seat hole 5f and tapers in the direction in which the valve body 5v is inserted. The width L4 is formed to be larger than the pipe axial direction width L2 of the valve seat body 5b at the position closest to the fluid pipe cut surface 2a.

Further, by increasing the axial width L3 of the base end portion of the valve seat body 5b, the valve seat body 5b can be brought closer to the cut surface 2a of the fluid pipe. Since the change in area can be reduced and the turbulence of the flow within the housing 4 can be suppressed, the pressure loss can be reduced.

Further, as shown in FIG. 9, the valve seat body 5b is provided with a valve seat body extension portion 5p that extends toward the fluid pipe cut surface 2a. Since the valve seat body extension portion 5p extends in the circumferential direction along the fluid pipe cut surface 2a toward the fluid pipe cut surface 2a, the flow from the existing fluid pipe 2 reaches the valve seat body extension portion 5p. It is possible to suppress turbulence of the flow inside the housing, reduce pressure loss, and further reduce the force acting on the valve body, thereby ensuring long-term reliability. In addition, by forming the valve seat hole portion 5f to have the same cross section as the fluid pipe, it is possible to reduce the change in the cross-sectional area of the flow path, suppress the turbulence of the flow inside the housing, and reduce the pressure loss. . The valve seat hole portion 5f preferably has the same diameter as the inner diameter of the fluid pipe, but may be matched to the outer diameter of the fluid pipe as appropriate.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions within the scope of the present invention are included in the present invention. be

In FIG. 9, the surface of the valve seat body 5b facing the cut surface 2a of the fluid pipe is formed as a valve seat body inclined surface 5q that tapers off in the direction in which the valve seat body 5b is inserted into the housing 4. . However, the surface of the valve seat body 5b facing the cut surface 2a of the fluid pipe is not limited to the inclined surface, and the portion above the position where the valve seat body 5b comes closest to the cut surface 2a of the fluid pipe is formed wide in a step shape. may Further, the width L3 of the base end portion of the valve seat body 5b in the pipe axis direction can be made larger than the minimum separation distance L1 of the existing fluid pipe 2 . For example, above the position where the valve seat body 5b is closest to the fluid pipe cut surface 2a, the valve seat body 5b or the valve seat body extension portion 5p, or the valve seat body 5b and the valve seat body extension portion 5p By further increasing the axial width, the distance between the valve seat body 5b and the cut surface 2a of the fluid pipe or the distance between the extended portion 5p and the cut surface 2a of the fluid pipe is minimized. Turbulence in the flow can be further suppressed, and pressure loss can be reduced.

1 valve device 2 existing fluid pipe (fluid pipe)
4 housing 5 valve body (insert)
5a valve lid 5b valve seat body 5f valve seat hole portion 5p valve seat body extension portion 5q valve seat body inclined surface 5r valve body inclined surface 5v valve body 72 cutter

Claims (5)

In the case of a divided structure that encloses the water pipe in a sealed manner, the case is filled with tap water by cutting with a cylindrical rotatable cutter in a non-interrupted state, and the case is filled with clean water. A method for installing a valve body in which the valve body is inserted by a valve body insertion device into a spaced portion between the cut surfaces of the water pipe formed in an arc, and is installed,
The valve main body includes a valve body, a valve operating shaft connected to the upper portion of the valve body and configured to move the valve body by rotating an operating portion at the upper end, a valve seat body having a valve seat hole, a valve cover for closing a housing opening of the housing; a sealing member for sealing between the valve seat body and the housing; a protruding portion having a portion, wherein the valve body can open and close the valve seat hole by being inserted downward from the accommodating portion toward the valve seat body installed in the housing. The valve body insertion device includes an insertion device housing connected to the housing, an insertion shaft that can advance and retreat with respect to the insertion device housing, and a holding portion provided at one end of the insertion shaft. and inserting the valve body into the housing with the holding part below the operating part at the upper end of the valve operating shaft in the valve body and holding the projecting part, The valve body is installed so that the bottom of the valve body is in contact with the bowl-shaped housing bottom of the housing, and in a state where the holding section holds the protruding section of the valve body, below the holding section A method for installing a valve body, comprising screwing a retaining screw provided on the housing side, and fixing an outer peripheral portion of the valve body with the retaining screw. 2. The method for installing a valve body according to claim 1, wherein the holding portion extends downward so as to straddle the valve operating shaft. 2. After the valve body is inserted into the housing, the insertion shaft and the holding portion are removed through a working hole formed in the insertion device housing so as to be openable and closable. 3. or the installation method of the valve body according to 2. 4. The method of installing a valve body according to claim 3, wherein the removing work is a work of removing a mounting bolt that connects the insertion shaft and the holding portion. 5. The method for installing a valve body according to claim 3, wherein after the removal work, the insertion device housing and the insertion shaft are removed, and the holding portion is removed from the valve body.

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