JP2021060105A - Valve device - Google Patents

Abstract

To provide a valve device which prevents a seal performance from being reduced by rubbing up a vertical packing part of a packing of an inner valve box with divided surface packings of an outer valve box, while attaining reduction of insertion resistance of the inner valve box.SOLUTION: The present invention relates to a valve device comprising an outer valve box 2 which is mountable on a fluid pipe, and an inner valve box 4 which is accommodated within the outer valve box 2. On an outer surface of the inner valve box 4, a packing 6 is provided for sealing gaps among an annular packing contact surface 2a on an inner surface of the outer valve box 2 closer to a valve insertion port part 20, a vertical packing contact surface 2b continued to a plurality of parts of the annular packing contact surface 2a, and a bottom packing contact surface 2c continued to a lower end of the vertical packing contact surface 2b. The packing 6 is configured while being divided into an annular first packing 61 in contact with the annular packing contact surface 2a and a second packing 62 in contact with the vertical packing contact surface 2b and the bottom packing contact surface 2c. An upper end side of a vertical packing part 62A of the second packing 62 is supported in a vertically movable state while penetrating a vertical packing connection portion of the first packing 61.SELECTED DRAWING: Figure 3

Description

The present invention can block or switch between an outer valve box having a split structure that can be attached to a fluid pipe and a flow path of a fluid that is inserted from the valve insertion port portion at the upper part of the outer valve box and flows in the fluid pipe. An inner valve box having a valve body is provided, and the outer surface of the inner valve box is formed from a plurality of annular packing contact surfaces on the inner surface of the outer valve box on the valve insertion port side and the annular packing contact surfaces. The present invention relates to a valve device provided with a packing provided for sealing between a continuous vertical packing contact surface on the bottom side and a continuous bottom packing contact surface at the lower end of the vertical packing contact surface.

As the valve device, there is a gate valve shown in FIGS. 4 to 7 of Patent Document 1. The outer valve box of this gate valve is composed of a split T-shaped pipe divided into upper and lower parts, and is externally fixed to the outer peripheral surface of the valve installation location of the fluid pipe in a watertight state. After cutting and removing a part of the fluid pipe in the outer valve box, the inner valve box having a valve body capable of blocking the flow path in the fluid pipe is inserted from the valve insertion port portion of the outer valve box. The packing mounted on the outer surface of the inner valve box contacts the annular packing portion that contacts the annular packing contact surface on the inner surface of the outer valve box, the vertical packing portion that contacts the vertical packing contact surface, and the bottom packing contact surface. It is configured by integrally forming a bottom packing portion.
Further, the divided surfaces of the two divided housings of the outer valve box are provided with a divided surface packing that seals the space between the outer peripheral surface and the divided surface of the fluid pipe in a watertight state. The vertical packing part of the packing comes into contact.

Japanese Unexamined Patent Publication No. 2016-61391

In the above valve device, when the two split housings of the outer valve box are externally fixed to the outer peripheral surface of the existing fluid pipe, the split surface packing provided on the split surfaces of the two split housings is compressed into a watertight state, and the outer valve is used. The inner end surface of the split surface packing exposed on the inner surface side of the box bulges and deforms toward the internal space side of the outer valve box and protrudes. Therefore, when the inner valve box having the valve body is inserted from the valve insertion port portion of the outer valve box, the vertical packing portion of the packing mounted on the outer surface of the inner valve box protrudes toward the internal space side of the outer valve box. It is pressed and rubbed by the bulging deformed portion of the inner end surface of the split surface packing, and the vertical packing portion of the packing is stretched upward as the inner valve box is inserted and moved. As a result, the vertical packing connection portion of the annular packing portion is pushed up and rolled up by the vertical packing portion that is extended upward, and the sealing performance at the vertical packing connection portion is deteriorated, and the insertion resistance of the inner valve box is also increased. There is.

In view of this situation, the main subject of the present invention is to reduce the insertion resistance of the inner valve box, while the vertical packing portion of the packing mounted on the outer surface of the inner valve box is the split surface packing of the outer valve box. It is an object of the present invention to provide a valve device capable of suppressing deterioration of sealing performance due to being pressed and rubbed by a bulging deformed portion of an inner end surface.

The first characteristic configuration of the present invention is an outer valve box having a split structure that can be attached to a fluid pipe, and a fluid that is inserted and accommodated from a valve insertion port portion at the upper part of the outer valve box and that flows in the fluid pipe. An inner valve box having a valve body capable of blocking or switching the flow path is provided, and the outer surface of the inner valve box includes an annular packing contact surface on the inner surface of the outer valve box on the valve insertion port side. A valve device provided with packing that seals between a vertical packing contact surface that is continuous from a plurality of annular packing contact surfaces to the bottom side and a bottom packing contact surface that is continuous at the lower end of the vertical packing contact surface. hand,
The packing is divided into an annular first packing that contacts the annular packing contact surface and a second packing that contacts the vertical packing contact surface and the bottom packing contact surface, and the vertical packing portion of the second packing. The upper end side of the first packing is pierced and supported by the vertical packing connection portion of the first packing in a state where it can move up and down.

According to the above configuration, when the inner valve box having the valve body is inserted from the valve insertion port portion of the outer valve box, the vertical packing portion of the second packing mounted on the outer surface of the inner valve box is the outer valve box. Of the split surface packing of the above, it is pressed and rubbed by the bulging deformed portion of the inner end surface protruding toward the inner space side from the inner surface of the outer valve box. Therefore, even if the vertical packing portion of the second packing is stretched upward as the inner valve box is inserted and moved, the upper end side of the vertical packing portion can move up and down to the vertical packing connection portion of the first packing. Since it is supported through the first packing, only the upper end side portion of the vertical packing portion that is in the penetrating state with respect to the first packing extends upward. Therefore, the vertical packing connection portion of the first packing is not pushed up by the vertical packing portion extended upward, and it is possible to prevent the vertical packing connection portion of the first packing from being rolled up.
Therefore, the vertical packing portion of the second packing mounted on the outer surface of the inner valve box is the dividing surface of the outer valve box while reducing the insertion resistance of the inner valve box by the above-mentioned rational modification of the packing. It is possible to suppress a decrease in sealing performance due to being pressed and rubbed by a bulging deformed portion on the inner end surface of the packing.

In the second characteristic configuration of the present invention, a packing insertion hole into which the upper end side of the vertical packing portion is inserted from below is formed through the vertical packing connection portion of the first packing, and the inner peripheral surface of the packing insertion hole is formed. The point is that a gap is formed between the vertical packing portion and the outer peripheral surface.

According to the above configuration, the vertical packing portion of the second packing can be easily inserted into the packing insertion hole formed through the vertical packing connection portion of the first packing. Moreover, since the friction between the vertical packing portion of the second packing extending upward and the packing insertion hole of the first packing is also reduced, it is possible to prevent the vertical packing connection portion of the first packing from being rolled up. it can.

The third characteristic configuration of the present invention is that at least the vertical direction in the first packing of the inner valve box arranged at the inner valve box accommodating position in the outer valve box on the annular packing contact surface of the outer valve box. The point is that a packing compression portion is provided to compress the penetrating portion of the packing portion inward in the radial direction.

According to the above configuration, when the inner valve box is arranged at the inner valve box accommodating position in the outer valve box, at least the second packing in the first packing is provided by the packing compression portion provided on the annular packing contact surface of the outer valve box. By compressing the penetrating portion of the vertical packing portion of the first packing inward in the radial direction, the inner peripheral surface of the packing insertion hole of the first packing and the outer peripheral surface of the vertical packing portion of the second packing are brought into close contact with each other in the first packing. High sealing performance can be ensured at the penetration portion of the vertical packing portion.

The fourth characteristic configuration of the present invention is that the packing compression portion is formed by forming the annular packing contact surface of the outer valve box on an inclined surface of the lower constriction.

According to the above configuration, by forming the annular packing contact surface of the outer valve box on the inclined surface of the lower constriction, the entire circumference of the first packing can be pressed inward in the radial direction and compressed. It is possible to further improve the sealing performance at the penetrating portion of the first packing through which the vertical packing portion of the 2 packing penetrates.

Perspective view of the valve device of the first embodiment Front view of valve gear Vertical sectional view of FIG. Horizontal sectional view of FIG. An exploded perspective view of the valve device Disassembled enlarged perspective view of packing Semi-sectional view when inserting the inner valve box Enlarged horizontal cross-sectional view (a) and enlarged vertical cross-sectional view (b) at the penetration portion of the vertical packing portion. Enlarged vertical cross-sectional view of the packing compression section Semi-cross-sectional view when the inner valve box is placed at the inner valve box accommodating position inside the outer valve box Enlarged horizontal cross-sectional view (a) and enlarged vertical cross-sectional view (b) at the penetration portion of the vertical packing portion. Enlarged horizontal cross-sectional view of the main part showing a modified example of packing Horizontal sectional view of the valve device of the second embodiment Enlarged perspective view of the inner valve box Disassembled enlarged perspective view of packing

Embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 4 show a valve device installation structure at a branch pipe connection portion of an existing water pipe 1 which is an example of a fluid pipe. As shown in FIG. 5, the three-way valve specification valve device V used in this valve device installation structure includes an outer valve box 2 having a split structure that can be mounted on the outer peripheral surface of the existing water pipe 1 in a watertight state, and an outer valve box. It is provided with an inner valve box 4 having a valve body 3 which is inserted and accommodated from the valve insertion port 20 on the upper portion of 2 and which can switch the flow path of clean water (fluid) flowing in the existing water pipe 1. .. In the present embodiment, as shown in FIGS. 1, 2, and 4, a split structure in which both ends of the outer valve box 2 in the pipe axis direction are fixed to both pipe ends 1A and 1B of the existing water pipe 1 to prevent them from coming off. The detachment prevention metal fitting 5 is provided.

In the valve device installation structure, although not shown, a housing provided with a work on-off valve is connected to the upper flange 23 of the outer valve box 2 attached to the outer peripheral surface of the existing water pipe 1 in a watertight state. The cylindrical cutter arranged in the housing is fed through the work on-off valve that has been opened, and the valve installation location of the existing water pipe 1 is cut in an uninterrupted state. After the cutting work, the inner valve box 4 carried into the housing is inserted from the valve insertion port 20 of the outer valve box 2 through the work on-off valve that has been opened. When the inner valve box 4 is arranged at the inner valve box accommodating position in the outer valve box 2, the upper lid 24 is attached to the upper flange 23 of the outer valve box 2 as shown in FIGS. It is watertightly fixed and connected with a nut 26.

As shown in FIGS. 1, 2, and 5, the outer valve box 2 is configured by using a split T-shaped tube that can be divided into upper and lower parts. The upper split housing 21 and the lower split housing 22 that form the outer valve box 2 are formed with connecting flanges 21A and 22A that project outward along the split surface. The connecting flange 21A of the upper split housing 21 and the connecting flange 22A of the lower split housing 22 are fastened and fixed by bolts 33 and nuts 34 of the fastening means.
As shown in FIGS. 1, 2, and 5, the upper split housing 21 and the lower split housing 22 have water pipe holding portions 21B held at two locations in the pipe axis direction of the existing water pipe 1. , 22B and branch pipe holding portions 21C and 22C for fitting and holding the branch short pipe 27 in a watertight state along the branch axis direction orthogonal to the pipe axis of the existing water pipe 1. ..

As shown in FIGS. 3 and 4, the inner surface of both water pipe holding portions 21B of the upper split housing 21, the split surface of the connecting flange 21A, and the inner surface of the branch pipe holding portion 21C have an upper outer surface of the existing water pipe 1. An upper packing mounting groove 29 for mounting the annular upper split surface packing 28 arranged along the upper outer surface and the split surface of the branch short pipe 27 is formed. Further, on the inner surface of both water pipe holding portions 22B of the lower split housing 22, the split surface of the connecting flange 22A and the inner surface of the branch pipe holding portion 22C, the lower outer surface of the existing water pipe 1 and the lower side of the branch short pipe 27 A lower packing mounting groove 31 for mounting the annular lower split surface packing 30 arranged along the side outer surface and the split surface is formed.
The upper split surface packing 28 mounted in the upper packing mounting groove 29 and the lower split surface packing 30 mounted in the lower packing mounting groove 31 are brought into a high surface pressure state by the fastening operation of the bolt 33 and the nut 34 of the fastening means. It is compressed.

As shown in FIGS. 3 and 4, of the upper split surface packing 28 and the lower split surface packing 30, the outer valve box 2 is located at a portion corresponding to each packing mounting ridge 45 of the inner valve box 4 described later. The inner end faces 28a and 30a that are exposed flush with the inner surface of the above are formed. The inner end surface 28a of the upper split surface packing 28 and the inner end surface 30a of the lower split surface packing 30 come into contact with the vertical packing portion 62A of the second packing 62 mounted in the second packing mounting groove 47 of the inner valve box 4, which will be described later. To do. The inner end surface 28a of the upper split surface packing 28 and the inner end surface 30a of the lower split surface packing 30 are compressed by the fastening operation with the bolts 33 and nuts 34 and bulge and deform toward the internal space side of the outer valve box 2.

As shown in FIGS. 3 to 5, the inner valve box 4 is watertightly attached to the inner valve box main body 41 having a cylindrical peripheral wall 41A and the annular upper annular wall portion 41B of the inner valve box main body 41 with bolts 42. It includes an inner valve lid 43 that is fixedly connected. The peripheral wall 41A of the inner valve box main body 41 has a first communication hole 32A facing one pipe end 1A of the existing water pipe 1 and a second communication hole 32B facing the other pipe end 1B. A third communication hole 32C facing the pipe 27 is formed as an opening.

The upper and lower annular wall portions 41B and bottom wall portion 41C of the inner valve box 4 are rotatably supported by the vertical shaft portions of the valve body 3 around the vertical axis core. The valve body 3 rotates along the inner surface of the peripheral wall 41A of the inner valve box main body 41 by the rotation operation of the valve shaft 44, and selectively closes one of the first communication hole 32A to the third communication hole 32C. ..

As shown in FIG. 4, the peripheral wall 41A of the inner valve box 4 has a first narrow vertical wall portion 41a located between the first communication hole 32A and the third communication hole 32C, and the second communication hole 32B and the second communication hole 32B. A second narrow vertical wall portion 41b located between the three communication holes 32C and an arc-shaped wide vertical wall portion 41c located between the first communication hole 32A and the second communication hole 32B are provided.
The end of the first narrow vertical wall portion 41a on the outer surface of the third communication hole 32C, the end of the outer surface of the second narrow vertical wall portion 41b on the third communication hole 32C side, and the wide vertical wall portion 41c. A packing mounting ridge 45 that projects toward the inner surface side of the outer valve box 2 is formed at the central portion in the circumferential direction on the outer surface.

As shown in FIGS. 3 and 4, an annular first packing mounting groove 46 is formed on the outer surface of the upper annular wall portion 41B of the inner valve box 4. A second packing mounting groove 47 continuous with the first packing mounting groove 46 is formed on each of the outer surfaces of the packing mounting ridges 45 of the inner valve box 4. An annular third packing mounting groove 48 is formed on the outer surface of the bottom wall portion 41C of the inner valve box 4 so as to be continuous with the lower end of each second packing mounting groove.

As shown in FIG. 3, of the inner surface of the outer valve box 2, the portion of the inner valve box 4 facing the first packing mounting groove 46 becomes the annular packing contact surface 2a on the valve insertion port 20 side, and each second packing. The portion facing the mounting groove 47 is the vertical packing contact surface 2b, and the portion facing the third packing mounting groove 48 is the bottom packing contact surface 2c.

As shown in FIGS. 3 to 5, the first packing mounting grooves 46 to the third packing mounting grooves 48 formed on the outer surface of the inner valve box 4 have an annular packing contact surface 2a on the inner surface of the outer valve box 2. An inner valve box packing 6 that seals between the vertical packing contact surface 2b and the bottom packing contact surface 2c is attached.
As shown in FIGS. 5 and 6, the inner valve box packing 6 is in contact with the annular first packing 61 mounted in the first packing mounting groove 46 in a state of being in contact with the annular packing contact surface 2a, and each vertical packing contact. It is divided into a second packing mounting groove 47 and a second packing 62 mounted in the third packing mounting groove 48 in a state of being in contact with the surface 2b and the bottom packing contact surface 2c.

As shown in FIG. 6, the second packing 62 has a vertical packing portion 62A having a circular cross-sectional shape mounted on the three second packing mounting grooves 47 and a bottom packing portion mounted on the third packing mounting groove 48. It is configured by integrally forming with 62B. As shown in FIGS. 7 and 8, the upper end side portion 62a of each vertical packing portion 62A is penetratingly supported by the vertical packing connection portion 61a of the first packing 61 in a state where it can move up and down. Specifically, the vertical packing connection portion 61a of the first packing 61 is formed through a packing insertion hole 63 into which the upper end side portion 62a of each vertical packing portion 62A of the second packing 62 is inserted from below. As shown in FIG. 8, the inner diameter of each packing insertion hole 63 is configured to be slightly larger than the outer diameter of the vertical packing portion 62A, and is formed between the inner peripheral surface of the packing insertion hole 63 and the outer peripheral surface of the vertical packing portion 62A. A gap S is formed between them.

Then, as shown in FIGS. 5 and 7, when the inner valve box 4 having the valve body 3 is inserted from the valve insertion port portion 20 of the outer valve box 2, the inner valve box 4 is attached to the outer surface of the inner valve box 4. 2 The vertical packing portion 62A of the packing 62 is a bulging deformed portion of the inner end surfaces 28a and 30a of the two divided surface packings 28 and 30 of the outer valve box 2 protruding toward the inner space side from the inner surface of the outer valve box 2. It is pressed with and rubbed up. Therefore, the vertical packing portion 62A of the second packing 62 is extended upward as the inner valve box 4 is inserted and moved. However, since the upper end side portion 62a of the vertical packing portion 62A is penetratingly supported by the vertical packing connecting portion 61a of the first packing 61 in a state where it can move up and down, the vertical packing portion 61 is in a penetrating state with respect to the first packing 61. Only the upper end side portion 62a of the packing portion 62A extends upward. Therefore, the vertical packing connection portion 61a of the first packing 61 is not pushed up by the vertical packing portion 62A extending upward, and the vertical packing connection portion 61a of the first packing 61 can be prevented from being rolled up.
Therefore, the vertical packing portion of the second packing 62 mounted on the outer surface of the inner valve box 4 while reducing the insertion resistance of the inner valve box 4 by the above-mentioned rational modification of the packing 6 for the inner valve box. It is possible to suppress a decrease in sealing performance due to the 62A being pressed and rubbed by the bulging deformed portions of the inner end surfaces 28a and 30a of the two split surface packings 28 and 30 of the outer valve box 2.

Further, as shown in FIG. 8, a gap S is formed between the inner peripheral surface of the packing insertion hole 63 formed through the vertical packing connection portion 61a of the first packing 61 and the outer peripheral surface of the vertical packing portion 62A. Therefore, the vertical packing portion 62A of the second packing 62 can be easily inserted into the packing insertion hole 63 of the first packing 61. Moreover, the friction between the vertical packing portion 62A of the second packing 62 and the packing insertion hole 63 of the first packing 61, which is extended upward with the insertion movement of the inner valve box 4, is also reduced, so that the first packing It is possible to prevent the vertical packing connection portion 61a of the packing 61 from rolling up.

As shown in FIGS. 3, 5, and 11 (b), a vertical packing extending upward is provided at a portion of the outer peripheral portion of the inner valve lid 43 corresponding to each packing insertion hole 63 of the first packing 61. An insertion hole 43a through which the upper end side portion 62a of the portion 62A can pass is formed as a notch. In the present embodiment, the insertion hole 43a is notched in a U shape, but may be formed through a closed loop such as a round hole.

Further, as shown in FIGS. 7 to 11, the annular packing contact surface 2a of the outer valve box 2 has a first packing 61 of the inner valve box 4 arranged at the inner valve box accommodating position in the outer valve box 2. A packing compression portion 7 is provided that compresses at least the penetrating portion of the vertical packing portion 62A of the second packing 62 inward in the radial direction. The packing compression portion 7 is formed by forming the entire area of the annular packing contact surface 2a of the outer valve box 2 on an inclined surface of the lower constriction.

Then, as shown in FIG. 11, the packing compression portion 7 provided on the annular packing contact surface 2a compresses at least the penetrating portion of the vertical packing portion 62A of the second packing 62 in the first packing 61 inward in the radial direction. As a result, the inner peripheral surface of the packing insertion hole 63 of the first packing 61 and the outer peripheral surface of the vertical packing portion 62A of the second packing 62 are brought into close contact with each other without a gap. As a result, high sealing performance can be ensured at the penetrating portion of the vertical packing portion 62A in the first packing 61. Moreover, the movement of the vertical packing portion 62A of the second packing 62 can be fixed by the compression of the first packing 61.
Moreover, since the packing compression portion 7 is formed by forming the annular packing contact surface 2a of the outer valve box 2 on the inclined surface of the lower constriction, the entire circumference of the first packing 61 is radially inward. It can be pressed and compressed, and the sealing performance at the penetrating portion of the first packing 61 can be further improved.

When the inner valve box 4 is arranged at the inner valve box accommodating position in the outer valve box 2, the first packing 61 and the second packing 62 mounted on the outer surface of the inner valve box 4 are on the inner surface of the outer valve box 2. In close contact with the annular packing contact surface 2a, the vertical packing contact surface 2b, and the bottom packing contact surface 2c.
Of the inner surface of the outer valve box 2, the radius of the upper inner peripheral surface 2d continuous with the upper end of the inclined surface of the lower constriction is from the central axis of the inner valve box 4 to the outer surface of the vertical packing portion 62A of the second packing 62. It is configured to be slightly larger than the radius. Therefore, as shown in FIGS. 7 and 9, when the inner valve box 4 is inserted from the valve insertion port 20 of the outer valve box 2, it is attached to the upper inner peripheral surface 2d of the outer valve box 2 and the inner valve box 4. A minute gap is generated between the vertical packing portion 62A and the outer surface. With this gap, the insertion resistance of the inner valve box 4 can be reduced.

[Modified example of the first embodiment]
As shown in FIG. 12, the vertical packing connection portion 61a of the first packing 61 is vertically formed by penetrating the packing insertion hole 63 into which the upper end side portion 62a of each vertical packing portion 62A of the second packing 62 is inserted from below. The outer surface of the packing connection portion 61a is formed on an arcuate outer surface 61b that protrudes outward in the radial direction from the outer surface of the other portion.
In this modification, the packing compression portion 7 provided on the annular packing contact surface 2a compresses the arcuate outer surface 61b of the vertical packing connection portion 61a of the first packing 61 inward in the radial direction.

[Second Embodiment]
13 to 15 show a valve device V having a butterfly valve specification. This valve device V is inserted and accommodated from an outer valve box 2 having a split structure that can be mounted on the outer peripheral surface of an existing water pipe 1 in a watertight state, and a valve insertion port (not shown) at the upper part of the outer valve box 2. In addition, an inner valve box 4 having a valve body 3 capable of blocking the flow path of the fluid flowing in the existing water pipe 1 is provided.

As shown in FIG. 13, the outer valve box 2 is configured by using a split T-shaped tube that can be divided into upper and lower parts. The upper split housing 21 and the lower split housing 22 constituting the outer valve box 2 are watertightly flange-joined with the split surface packings 28 and 30 interposed therebetween.
Of the split surface packings 28 and 30, the inner end surfaces 28a and 30a that are exposed flush with the inner surface of the outer valve box 2 at the portions corresponding to the left and right side wall surfaces 50a of the partition wall 50 in the inner valve box 4 described later. Is formed. The inner end faces 28a and 30a of the split surface packings 28 and 30 come into contact with the vertical packing portion 62A of the second packing 62 mounted in the second packing mounting groove 47 of the inner valve box 4 described later. The inner end faces 28a and 30a of the split surface packings 28 and 30 are compressed by the fastening operation of the fastening means and bulge and deform toward the internal space side of the outer valve box 2.

As shown in FIGS. 13 and 14, the inner valve box 4 has a vertical partition wall 50 having a circular communication port 51 formed in a substantially central portion thereof, and a vertical opening / closing shaft 52 provided on the partition wall 50. A valve body 3 that rotates around the center to open and close the communication port 51, and a horizontal circular upper lid portion 53 that is integrally connected to the upper end portion of the partition wall 50.
An annular first packing mounting groove 46 is formed on the outer peripheral surface of the upper lid portion 53 of the inner valve box 4. A second packing mounting groove 47 continuous with the first packing mounting groove 46 is formed on the left and right side wall surfaces 50a of the partition wall 50 continuous with the outer peripheral surface of the upper lid portion 53. On the bottom surface of the partition wall 50, an annular third packing mounting groove 48 is formed at the lower end of each second packing mounting groove 47.

Of the inner surface of the outer valve box 2, the portion of the inner valve box 4 facing the first packing mounting groove 46 becomes the annular packing contact surface (not shown) on the valve insertion port (not shown) side, and each second packing is mounted. The portion facing the groove 47 is the vertical packing contact surface (not shown), and the portion facing the third packing mounting groove 48 is the bottom packing contact surface (not shown).

As shown in FIGS. 13 and 14, the first packing mounting grooves 46 to the third packing mounting grooves 48 formed on the outer surface of the inner valve box 4 have an annular packing contact surface 2a on the inner surface of the outer valve box 2. An inner valve box packing 6 that seals between the vertical packing contact surface 2b and the bottom packing contact surface 2c is attached. The packing 6 for the inner valve box comes into contact with the annular first packing 61 mounted on the first packing mounting groove 46 in a state of being in contact with the annular packing contact surface 2a, the vertical packing contact surface 2b, and the bottom packing contact surface 2c. In this state, it is divided into a second packing mounting groove 47 and a second packing 62 mounted in the third packing mounting groove 48.

As shown in FIG. 15, the second packing 62 has a vertical packing portion 62A having a circular cross-sectional shape mounted on the two second packing mounting grooves 47 and a bottom packing portion mounted on the third packing mounting groove 48. It is configured by integrally forming with 62B. The upper end side portion 62a of each vertical packing portion 62A is penetratingly supported by the vertical packing connection portion 61a of the first packing 61 in a state where it can move up and down. Specifically, the vertical packing connection portion 61a of the first packing 61 is formed through a packing insertion hole 63 into which the upper end side portion 62a of each vertical packing portion 62A of the second packing 62 is inserted from below. The inner diameter of each packing insertion hole 63 is configured to be slightly larger than the outer diameter of the vertical packing portion 62A, and there is a gap between the inner peripheral surface of the packing insertion hole 63 and the outer peripheral surface of the vertical packing portion 62A (not shown). Is formed.

Further, the packing compression portion (not shown) provided on the annular packing contact surface 2a compresses at least the penetrating portion of the vertical packing portion 62A of the second packing 62 in the first packing 61 inward in the radial direction. 1 The inner peripheral surface of the packing insertion hole 63 of the packing 61 and the outer peripheral surface of the vertical packing portion 62A of the second packing 62 are in close contact with each other without a gap. As a result, high sealing performance can be ensured at the penetrating portion of the vertical packing portion 62A in the first packing 61.

[Other Embodiments]
(1) In each of the above-described embodiments, when the upper end side portion 62a of each vertical packing portion 62A is penetrated and supported by the vertical packing connection portion 61a of the first packing 61 in a vertically movable state, the vertical packing 61 is vertically supported. A U-shaped cut was formed in the packing connection portion 61a through a packing insertion hole 63 into which the upper end side portion 62a of each vertical packing portion 62A of the second packing 62 is inserted from below. A notch may be formed.

(2) The above-mentioned first embodiment exemplifies the valve device V having a three-way valve specification, and the above-mentioned second embodiment exemplifies the valve device V having a butterfly valve specification. It can be applied to the valve device V of other specifications such as a style.

1 Fluid pipe (existing water pipe)
2 Outer valve box 2a Circular packing contact surface 2b Vertical packing contact surface 2c Bottom packing contact surface 3 Valve body 4 Inner valve box 6 Packing (Inner valve box packing)
7 Packing compression part 20 Valve insertion port 61 First packing 62 Second packing 63 Packing insertion hole S Gap

Claims (4)

A split-structured outer valve box that can be attached to the fluid pipe and a valve that is inserted and accommodated from the valve insertion port at the top of the outer valve box and that can block or switch the flow path of the fluid flowing in the fluid pipe. An inner valve box having a body is provided, and the outer surface of the inner valve box includes an annular packing contact surface on the inner surface of the outer valve box on the valve insertion port side, and a plurality of locations to the bottom of the annular packing contact surface. A valve device provided with a packing that seals between a vertical packing contact surface that is continuous on the side and a bottom packing contact surface that is continuous at the lower end of the vertical packing contact surface.
The packing is divided into an annular first packing that contacts the annular packing contact surface and a second packing that contacts the vertical packing contact surface and the bottom packing contact surface, and the vertical packing portion of the second packing. The upper end side of the valve device is supported through the vertical packing connection portion of the first packing so as to be movable up and down. A packing insertion hole into which the upper end side of the vertical packing portion is inserted from below is formed through the vertical packing connection portion of the first packing, and the inner peripheral surface of the packing insertion hole and the outer peripheral surface of the vertical packing portion are formed. The valve device according to claim 1, wherein a gap is formed between the valve devices. On the annular packing contact surface of the outer valve box, at least a penetrating portion of at least the vertical packing portion of the first packing of the inner valve box arranged at the inner valve box accommodating position in the outer valve box is within the radial direction. The valve device according to claim 1 or 2, wherein a packing compression unit for compressing is provided on the side. The valve device according to claim 3, wherein the packing compression portion is formed by forming the annular packing contact surface of the outer valve box on an inclined surface of a lower constriction.

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