JPH05280685A - Fluid control valve device for inserting incessant water - Google Patents

Abstract

PURPOSE:To reduce the loss of water head and the height of a valve device by disposing a branch pipe part on the same horizontal position as an existing fluid pipe in the intermediate position of a valve box through a branch communicating port to open and close alternately a branch cutting-off part and the branch communicating port by a vertically movable flow change-over valve. CONSTITUTION:A valve box body 1 with a branch pipe is formed with a tubular part 1A opened above and drilled sideways, an additional pipe parts 1B horizontal and orthogonal to each other in the same level position and a branch pipe part. A controlling valve device S having the valve box body 1 with the branch pipe is disposed in the cut-off part Q of a branch pipe disposing part of an existing distributing water pipe P in the foundation to connect the additional pipe part 1B to the existing distributing water pipe P. On the other hand, a branch piping is connected to a branch communicating port 26 of the branch pipe part. A valve rod 3A is screwed into the valve box body 1, and a flow change-over valve 3 consisting of a pair of valve bodies 3c (only one is shown) moved upward and downward oppositely to each other by the rotation of the valve rod 3A is disposed to open and close the communication to the branch pipe side through the branch communicating port 26.

Description

Detailed Description of the Invention

A. OBJECT OF THE INVENTION (1) Industrial field of application The present invention is to install a fluid control valve in a fluid pipe in an uninterrupted water state (in a flow state without stopping the flow in the fluid pipe by a water control valve installed in advance). The present invention relates to a so-called uninterrupted water insertion fluid control valve device which is used when inserting a fluid in a fluid pipe line or branching a fluid pipe or stopping water.

(2) Conventional Technology and Problems Thereof The applicant of the present invention has proposed various types of this type of uninterrupted water insertion fluid control valve device. Among these devices, Japanese Patent Application No. 3-1742
No. 67 (hereinafter referred to as prior art) is different from the others in that the branch connection portion is in the same plane position as the existing fluid pipe. That is, the control valve device of the prior application is watertightly installed across the cut portion of the branch position of the existing fluid pipe, has a receiving portion at its upper end, and is flush with the existing fluid pipe in the middle thereof. A valve box body having a branch connecting pipe part and a perforated cylinder part disposed orthogonal to the existing fluid pipe; and a watertight fit by fitting into a receiving part of the perforated cylinder part of the valve box body. A lid body to be arranged; a valve body and a valve rod, the valve rod being mounted on the lid body, the valve body being arranged to be movable back and forth in the perforated cylindrical portion of the valve box body, and when retracting The opening of the branch connecting pipe of the perforated cylinder is closed, and at the time of advancing, the branch communication hole opened in the valve body and the opening of the branch connecting pipe are communicated with each other, and the flow path of the existing fluid pipe is blocked. And a flow switching valve for

The fluid control valve device is used and operates as follows. The device with the lid and the flow switching valve removed is assembled and fixed at the planned branch position of the existing fluid pipe, the branch pipe is connected to the branch connection pipe part, and the work water control valve is attached to the upper end of the perforated cylinder part. The pipe is attached and the existing pipe is perforated and cut by the perforator through the water control valve. Then, after removing the perforator and the cut piece, the lid body incorporating the flow switching valve is inserted into the receiving portion of the perforated tubular portion via the working water control valve to fix the lid body. After that, the water control valve for work is removed. The valve body of the flow switching valve is advanced into the valve box body to cut off the water flow, and the water is passed through the branch connecting pipe section to the branch pipe. However, according to the uninterrupted water insertion fluid control valve device of the prior art, in the open state of the flow switching valve, the flowing water is redirected at the vertical valve portion of the flow switching valve and immediately flows out to the branch connection portion. , The head loss is small and it is economical in long-term use. Then, if the lid body equipped with the flow switching valve is assembled to this device, the water control valve for uninterrupted water work can be removed early, and there is no work of pulling out the flow switching valve.
Work effort is reduced and work efficiency is improved. Furthermore, after installing this device, a bypass pipe may be arranged, the time can be selected, and the flexibility of work is improved.

[0004] However, in the prior art, the length of the perforated cylinder portion is increased, and therefore the overall height of the device is high, not only the amount of excavated soil is increased, but also the flexibility of installing the bypass pipe is small. Become. Further, the direction of the flowing water is greatly bent by the flow switching valve, and some head loss occurs.

(3) Problems to be Solved by the Invention The present invention has been further developed while making use of the advantages of the above-mentioned prior application. In this type of uninterrupted water insertion fluid control valve device, The purpose is to further reduce loss and height.

B. Configuration of the Invention (1) Means for Solving Problems The uninterrupted water insertion fluid control valve device of the present invention has the following configuration in order to achieve the above object. That is, it is assembled in a watertight manner across the cut portion at the branch position of the existing fluid pipe, has an opening at its upper end, has a diameter larger than that of the existing fluid pipe, and is arranged orthogonally to the existing fluid pipe. A valve box body with a branch pipe, comprising: a perforated tubular portion; A valve lid fitted in the opening of the perforated cylindrical portion of the valve box body and arranged in a watertight manner; and a valve stem and two valve bodies, the valve stem being attached to the valve lid, It is arranged on the central axis of the perforated cylinder portion of the valve box body with a branch pipe, and the two valve bodies are screwed in common with the valve rod, and are independently movable in the perforated cylinder portion independently of each other. , One of the first valve bodies opens and closes the cutting portion, and the other second valve body opens and closes the branch pipe portion, and a flow switching valve; It is characterized by

(2) Operation The fluid control valve device of the present invention is used and operates as follows. This device, with the valve lid and flow switching valve removed, is assembled and fixed at the planned branch position of the existing fluid pipe, the bypass pipe is connected to the branch pipe part, and the work water control valve is attached to the upper end of the perforated cylinder part. The existing pipe is pierced and cut by a piercing machine through the water control valve. Then, after removing the perforator and the cut piece, the valve lid equipped with the flow switching valve is inserted into the opening of the perforated tubular portion through the working water control valve to fix the valve lid. At this time, the first valve body of the flow switching valve is located above the cutting portion, the cutting portion is opened, and the second valve body closes the communication port with the branch pipe portion. After that, the water control valve for work is removed. The first valve body of the flow switching valve is advanced into the body of the valve box to block the water flow, and at the same time, the second valve body opens the communication port with the branch pipe section and communicates with the bypass pipe through the branch pipe section. Water.

(3) Embodiment An embodiment of the uninterrupted water insertion fluid control valve device (hereinafter referred to as "control valve device") of the present invention will be described with reference to the drawings. Figure 1
6 shows an embodiment of the control valve device S. That is,
1 is a vertical cross-sectional view showing the overall structure of the main control valve device S in the valve closed state, FIG. 2 is a vertical cross-sectional view of the main control valve device S in the valve open state, FIG. 3 is its cross-sectional view, and FIG. Is its horizontal sectional view, FIG.
6 and 6 are partial views thereof. In the figure, thick arrows indicate the flow direction of the water flow.

Hereinafter, a water pipe will be described as an example. In the figure, P is an existing water distribution pipe buried in the ground, and the control valve device S of the present embodiment is attached to the branch pipe arrangement portion of the water distribution pipe P. Q is a cutting part cut by a punching machine at a branch point of the water distribution pipe P.

With reference to FIGS. 1 to 4, a control valve device S of the present embodiment is provided with a boring cylinder portion 1A, an attached pipe portion 1B and a branch connecting portion 1.
A valve box body 1 with a branch pipe, which is equipped with C, and is assembled to the water distribution pipe P; a valve lid 2 that is mounted in the opening of the perforated cylinder portion 1A of the valve box body 1; The flow switching valve 3 is capable of advancing and retracting into the valve box body 1; and main constituent members of the flow switching valve 3; and an upper lid 5 and a locking bolt 6.

The detailed structure of each part will be described below. Valve Box Body 1 with Branch Pipe The valve box body 1 with branch pipe is composed of a perforated cylinder portion 1A, an attached pipe portion 1B and a branch pipe portion 1C. The perforated cylinder portion 1A has an open top and a bottom has a bottom. A straight cylindrical body is formed, and the additional pipe portion 1B and the branch pipe portion 1C are arranged orthogonally from the same level position of the perforated cylinder portion 1A. More specifically, the perforated tube portion 1A is arranged orthogonal to the water distribution pipe P, and the inner diameter thereof is made sufficiently larger than the outer diameter of the water distribution pipe P. And the perforated cylinder portion 1
A is divided into an upper perforated cylinder portion 10a and a lower perforated cylinder portion 10b with a horizontal plane including the central axis O of the water distribution pipe P as a boundary.

A flange 12 is stretched outward at the upper end of the perforated cylinder portion 1A, and a so-called receiving portion for receiving the valve lid 2 is formed in the upper opening portion thereof. At the upper part of the perforated cylinder portion 1A corresponding to the receiving portion, a screw cylinder 14 in which the bolt holes 13 are screwed is fixed at a proper interval in the circumferential direction, and the locking bolt 6 is screwed. To be dressed. The guide ridges 16 are vertically provided from the middle of the perforated tube portion 1A to the bottom portion while avoiding the openings of the additional pipe portion 1B and the branch pipe portion 1C, which will be described later, and maintaining a predetermined interval. The guide ridges 16 guide the two valve bodies of the flow switching valve 3 forward and backward. Further, a boss portion 17 is provided at the center of the inner bottom surface of the perforated tubular portion 1A, and a guide hole 18 into which the tip of the valve rod of the flow switching valve 3 described later is fitted is provided at the center thereof.

The attached pipe portion 1B is formed so as to be continuous with the perforated cylinder portion 1A, and includes two upper and lower semi-tubular members 20 (an upper semi-tubular member 20a and a lower semi-tubular member 20b).
The end faces of these semi-tubular members 20 are brought into watertight contact with each other. Reference numeral 21 denotes a joint portion at the end of the attached pipe portion 1B in the pipe axial direction,
The receiving portion 21a, an annular rubber ring 21b loaded in the receiving portion 21a, a pressing wheel 21c for pressing the rubber ring 21b, and a tightening bolt 21d. The tightening bolt 21d is rotated and tightened through the pressing wheel 21c. Then, the rubber ring 21b is tightened to make the end portion of the attached pipe portion 1B watertight. A detachment prevention bolt 21e is screwed to the push ring 21c with a space between it and the tightening bolt 21d, and the cutting edge of the bolt 21e bites into the water pipe P to prevent the detachment.

The branch pipe portion 1C is formed so as to project from the side surface of the perforated cylinder portion 1A at the same level as the attached pipe portion 1B of the perforated cylinder portion 1A, that is, at the same horizontal position as the water distribution pipe P. The branch pipe portion 1C is divided into upper and lower parts by a plane including the central axis O of the water distribution pipe P as described above, like the auxiliary pipe portion 1B, and these semi-tubular members 23 (23).
The end faces of a and 23b) are butted against each other. Reference numeral 24 denotes a joint portion at the end of the branch pipe portion 1C, which has a structure similar to that of the attached pipe portion 1B, and has a receiving portion 24a, an annular rubber ring 24b loaded in the receiving portion 24a, and the rubber. It is composed of a push wheel 24c for pressing the wheel 24b and a tightening bolt 24d. And, of course, it is free to adopt another connection mode (for example, a flange joint) in place of the receiving port 24. The perforated cylinder portion 1A and the branch pipe portion 1C communicate with each other through a branch communication port 26. In the present embodiment, the branch communication port 26 is formed in a vertically elongated shape with a certain width (where the packing of the second valve body of the flow switching valve 3 described later abuts) between the adjacent guide ridges 16. ing.

As described above, the valve box body 1 is a two-piece body composed of the upper valve box body 1a and the lower valve box body 1b with the horizontal plane including the central axis O of the water distribution pipe P as a boundary. A flange 27 is formed at the joint end so as to project outward.
It is integrally assembled via a bolt / nut 28 inserted in a bolt insertion hole formed in the.

Valve lid 2 The valve lid 2 has a substantially disk shape, and a thick-walled edge portion is made long so as to be fitted in the receiving portion of the valve box body 1, and the outer portion of the edge portion is formed. Packing 3 installed in the packing groove recessed in the side surface
0 keeps watertight. On the outer side surface of the edge portion, a locking hole 31 for receiving the tip 6a of the locking bolt 6 corresponding to the bolt hole 13 of the receiving portion is formed above the packing 30. The lower end surface of the edge of the valve lid 2 is in contact with the upper surface of the flow switching valve 3 and serves as a stopper for the flow switching valve 3.
A central portion of the upper surface of the valve lid 2 is formed with a boss portion 33, and a valve rod insertion hole 34 through which a valve rod of the flow switching valve 3 described later is inserted is formed in the center of the boss portion 33. An annular upper lid 5 abuts on the upper surface of the valve lid 2. Bolt insertion holes are formed in the edge portion of the upper lid 5 in the circumferential direction so as to correspond to the bolt insertion holes of the flange portion 12 of the perforated cylinder portion 1A, and tightening bolts and nuts 36 are attached to both bolt insertion holes. 5 is fixed.

Flow switching valve 3 The flow switching valve 3 is screwed on one valve rod 3A and the valve rod 3A, and moves back and forth in opposite directions with the rotation of the valve rod 3A.
One valve body 3B (first valve body), 3C (second valve body). That is, the valve rod 3A has an upper screw 40 and a lower screw 41 which are reversely screwed with each other, and the first valve body 3B is screwed into the lower screw 41, and by advancing and retracting the same, the hole of the cut portion Q is opened and closed. The second valve body 3C is screwed into the upper screw 40, and the branch communication hole 26 is opened / closed by its forward / backward movement.

(Valve Rod 3A) More specifically, the valve rod 3A
Is mainly arranged with an upper screw 40 and a lower screw 41 formed in reverse threads, and is arranged on the central axis of the perforated cylinder portion 1A,
The lower end 42 is fitted into the guide hole 18 in the lower bottom of the valve box body 1A. The valve shaft portion 44 at the upper portion is the valve rod insertion hole 3 of the valve lid 2.
4 is a watertight seal through a packing 45, and a retaining member 47 that detachably presses a retaining ring (comprising a split body) 46 arranged above the packing 45 is detachable from the valve lid 2. Arranged freely on the boss.
Reference numeral 48 is a rotary operation portion at the upper end of the valve rod 3A.

(First Valve Body 3B) The first valve body 3B is the valve rod 3
The valve body 50 facing the cut portion Q at a position eccentric from A and the valve body 50 is provided below the valve body 50 and extends toward the valve stem 3A.
And a screw screwing portion 51 screwed to A. That is,
The valve body 50 has a sufficient height to cover the cut portion Q, and has a horizontal cross section substantially arcuate so that the front surface portion follows the inner peripheral wall surface of the perforated cylinder portion 1A. Then, in order to face the cutting portion Q, the portion is recessed so as to receive the cutting portion Q with the concave portion 53, so that only the upper portion is formed in the eaves portion 54. A packing 55 is attached to the outside of the valve body 50 via a groove. FIG. 5 shows the packing 55 taken out. The upper front surface portion 55a and the side surface portion 55b are in sliding contact with the inner peripheral surface of the perforated tubular portion 1A, and the lower portion 55c is in contact with the bottom surface of the perforated tubular portion 1A. On both sides of the valve main body 50, the guide ridges 16 are slidably contacted with each other to guide vertical movement.

The screw-threaded portion 51 has an arm portion 57 extending toward the valve rod 3A from the lower rear portion of the valve body 50.
A rectangular nut member 58 is fitted in the concave groove of the end portion 7 while being prevented from rotating together. The screw hole 5 is formed in the nut member 58.
9 is screwed, and the lower screw 41 of the valve rod 3A is screwed into the screw hole 59.
Screw together. In the first valve body 3B, the valve body 50
Although the front surface of the above is the concave portion 53, it is not necessary to form the concave curved surface.

(Second Valve Body 3C) The second valve body 3C is the valve rod 3
A valve main body 60 that faces the branch hole at a position eccentric from A, and is provided above the valve main body 60 and extends toward the valve rod 3A.
And a screw screwing portion 61 screwed to A. The second valve body 3C has a configuration substantially similar to that of the first valve body 3B. That is, the valve main body 60 has a height sufficient to cover the branch communication port 26, and the outer surface thereof has a shape along the inner peripheral wall surface of the perforated cylinder portion 1A. Therefore, the horizontal cross section is substantially the same. Make an arc shape. Unlike the first valve body 3B, no recess is formed, and its front surface 63 directly faces the branch communication port 26. This valve body 6
Packing 64 is attached to the outside of 0 through a groove. 6 shows the packing 64 taken out and shown. The upper front surface portion 64a, the side portion 64b, and the lower front surface portion 6 are shown.
4c slidably contacts the inner wall surface of the perforated cylinder portion 1A. Valve body 6
On both side surfaces of 0, the guide ridges 16 are slidably contacted with each other to guide vertical movement. The screw threaded portion 61 has an arm portion 65 extending toward the valve rod 3A from an upper portion of the back surface of the valve body 60, and a square nut member 66 co-rotates in a groove at an end portion of the arm portion 65. It is blocked and fitted. A screw hole 67 is screwed into the nut member 66, and the upper screw 40 of the valve rod 3A is screwed into the screw hole 67.

The characteristic feature of the valve body 3 is that the first valve body 3B and the second valve body 3C are screwed onto a common valve rod 3A,
With the rotation of the valve rod 3A, the respective valve bodies 3B and 3C move in opposite directions. That is, when the first valve body 3B is on the upper side and the cutting portion Q is opened, the second valve body 3C is on the lower side and closes the branch communication port 26, and conversely the first
When the valve body 3B is in the lower position and closes the cutting portion Q, the second
The valve body 3C moves to a higher position and opens the branch communication port 26.

As described above, the upper lid 5 is tightened with its bolts and nuts 36 to permanently fix the valve lid 2. The locking bolt 6 locks the tip portion 6a of the locking bolt 6 in the locking hole 31 of the valve lid 2 by tightening its rotation, and prevents the valve lid 2 from rising. 70 is a cap.

Next, the control valve device S of this embodiment is installed in the water distribution pipe P.
The procedure of the work to be installed in the uninterrupted water state will be described, and the operation of each member of the control valve device S will be described (see FIGS. 7 to 11). Here, a water pipe branching work will be described as an example. That is, as shown in FIGS. 7 and 8, from the upstream and downstream of the branch construction section of the water distribution pipe P, the bypass pipe B
And the old water pipe P is removed over the section L.

The following is a description based on the construction procedure. (1) By abutting and joining the upper and lower halved portions 1a and 1b of the valve box body 1 of the present device S from which the valve lid 2 and the flow switching valve 3 have been removed, at the planned branch position of the water distribution pipe P , Is attached in a watertight manner around the water distribution pipe P. At this time, the locking bolt 6 is retracted. Further, a blind lid is temporarily fixed to the joint portion 24 of the branch pipe portion 1C of the valve box body 1 in place of the push ring 24C.

(2) Thereafter, as shown in FIG. 9, the water control valve H for uninterrupted water work and the perforator I are attached in a watertight manner to the upper portion of the perforated cylinder portion 1A of the control valve device S via the flange 12. .. Next, the work water control valve H is opened, the cutter J of the perforator I is inserted into the perforated cylinder portion 1A, and the water distribution pipe P is cut.
In FIG. 9, 100 is a drive part of the punching machine I, 102 is its rotary drive shaft, and 104 is its watertight cylinder.

(3) The cutter J, which holds the cut piece of the water distribution pipe P, is raised to a position above the working water control valve H, and the water control valve H
The perforator I is removed while the is closed.

(4) As shown in FIG. 10, the flow switching valve 3 is attached to the valve lid 2, and the valve bodies 3B and 3C are closed in a predetermined state (the first valve body 3B is at the upper position and the second valve 3B is in the upper position). Body 3C is in the lower position), and the valve charging device K in which the flow switching valve 3 is detachably attached via the valve lid 2 is mounted in a watertight manner on the work water control valve H, and the water control valve H And the valve lid 2 is fitted and inserted into the opening of the box 1. At this time, the valve body 3 of the flow switching valve 3
B and 3C are inserted along the guide ridges 16 in the bored cylinder 1A, and the tip 42 of the valve rod 3A is fitted into the guide hole 18 in the bottom of the bored cylinder 1A, whereby the second valve The body 3C closes the opening 26 of the branch pipe portion 1C. In this state, the water flow is normal.

Then, the locking bolt 6 is rotated forward,
Insert the tip 6a into the locking hole 31 of the valve lid 2,
Temporarily fix the valve lid 2. In FIG. 10, 110 is an advancing / retreating shaft of the valve charging device K, 112 is a joint attached to the lower end of the advancing / retreating shaft 110, and is a joint for connecting with the flow switching valve 3, 114
Is an outer cylinder for making the apparatus K watertight, and 116 is a working window of the outer cylinder 114.

(5) The flow switching valve 3 and the valve insertion device K are disengaged, and then the valve insertion device K and the working water control valve H are removed. Thereafter, the upper lid 5 is brought into contact with the valve lid 2 and the bolts and nuts 36 are permanently fixed. FIG. 1 shows this state. In this state, the separately arranged bypass pipe B is connected to the branch pipe portion 1C of the apparatus S. That is, the blind lid of the joint portion 24 of the branch pipe portion 1C is removed, the tip of the bypass pipe B is inserted into the joint portion 24, and the watertightness is maintained by tightening the push ring 24C.

(6) The rotating portion 48 of the valve rod 3A projecting above the valve lid 2 is rotated to move the first valve body 3B of the flow switching valve 3 into the valve box body 1.
Let it go inside. On the contrary, the second valve body 3C is pulled upward. These valve bodies 3B and 3C are guide ridges 16
Is moved up and down along. When the bottom of the first valve body 3B reaches the bottom of the perforated cylinder 1A, the flow in the water distribution pipe P is blocked from the water stop side (downstream in upstream, upstream in downstream), while the second The valve body 3C opens the branch communication port 26,
Since it is in communication with the branch pipe portion 1C, the flow flows into the bypass pipe B via the branch pipe portion 1C. 11 and 2 to 4 show this state. In addition, by rotating the valve rod 3A manually through the operating rod and by driving the electric motor, the rotating operation is easy and convenient because it can be remotely operated.

(7) The existing water distribution pipe P included in the branch section is cut over the predetermined section L and cut and removed. After that, the remaining water distribution pipe P is pulled out from the attached pipe portion 1B, a water shut lid (reference numeral 72 in FIG. 8) is applied in place of the push ring 21c, and the existing water pipe P is completely shut off. It should be noted that the remaining pipe end of the water distribution pipe P can be provided with a water shut lid without pulling out the end of the water distribution pipe P as described above. The branch construction is completed by the above.

Since the control valve device S of this embodiment is used in the above-described manner, after the valve lid 2 is attached, the two valve bodies 3B and 3C of the flow switching valve 3 are alternately advanced and retracted. Water and water can be cut off freely, and the flexibility of uninterrupted work is high.
Therefore, the degree of freedom in the piping work of the bypass pipe B is increased, and rational construction design can be performed. In particular, the branch pipe portion 1C is arranged at the same horizontal position as the water distribution pipe P, and the vertical stroke of the valve bodies 3B and 3C is short,
Therefore, the height of the valve box body 1 can be shortened, and the amount of excavated soil can be reduced. In the above embodiment, the branch pipe installation work is taken as an example, but the application to the replacement work of the predetermined section L can be easily performed according to the procedure of the above work.

The present invention is not limited to the above embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included in the technical scope of the present invention. The branch pipe portion 1C of the valve box body 1 may be arranged obliquely to the pipe axis of the fluid pipe P. Further, in this embodiment, the perforated cylinder portion 1A and the branch pipe portion 1C communicate with each other through the narrowed and narrowed branch communication port 26. Can communicate. Therefore, in this case, the branch pipe portion 1
C may be arranged with a slight deviation from the central axis O of the existing water pipe P. The attached pipe portion 1B of the valve box body 1 is not essential as long as it is watertight and can be fixed at the opening of the perforated cylinder portion 1A facing the water distribution pipe P. That is, the welded joint satisfies this aspect.

C. Effects of the Invention According to the uninterrupted water insertion fluid control valve device of the present invention, the valve opening / closing operation of the flow switching valve can be performed with a short stroke,
Moreover, the flowing water immediately flows out to the branch portion without moving up and down when changing the direction. Therefore, the overall height of the device can be kept low, the flexibility of the installation site is high, and
There is little head loss of running water, and it is economical in long-term use. Then, after installing this device, a bypass pipe may be arranged, the time can be selected, and the flexibility of the work is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an overall valve closed state of an embodiment of an uninterrupted water insertion fluid control valve device of the present invention.

FIG. 2 is a vertical cross-sectional view similar to FIG. 1 with the valve opened.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an overall perspective view of a packing attached to the first valve body of the flow switching valve.

FIG. 6 is an overall perspective view of a packing attached to a second valve body of the flow switching valve.

FIG. 7 is a plan view showing an initial state of a work process of water pipe branch construction.

FIG. 8 is a plan view showing an end state of a work process of water pipe branching work.

FIG. 9 is a sectional view showing an initial process of a work process of water pipe branching work.

FIG. 10 is a cross-sectional view showing an intermediate process of a work process of water pipe branching work.

FIG. 11 is a cross-sectional view showing an end process of a work process of water pipe branching work.

[Explanation of symbols]

P ... Fluid pipe, Q ... Cutting part, 1 ... Valve box body, 1A ... Perforated cylinder part, 1C ... Branch pipe part, 2 ... Valve lid, 3 ... Flow switching valve, 3A
... Valve rod, 3B ... First valve body, 3C ... Second valve body, 26 ... Branch communication port

Claims (3)

[Claims] 1. An existing fluid pipe is installed in a watertight manner across a cut portion at a branch position, has an opening at its upper end, has a diameter larger than that of the existing fluid pipe, and is orthogonal to the existing fluid pipe. A valve box body with a branch pipe, comprising: a perforated tubular portion that is disposed as a plurality of parts; and a branch pipe portion that is provided on a side surface of the perforated tubular portion so as to project at the same plane position as the existing fluid pipe or a position near the same. A valve lid fitted in the opening of the perforated cylinder of the valve box with a branch pipe and arranged in a watertight manner; consisting of one valve rod and two valve bodies, the valve rod being attached to the valve lid Are arranged on the central axis of the perforated cylinder portion of the valve box body with the branch pipe, the two valve bodies are screwed in common with the valve rod, and alternately advance and retreat in the perforated cylinder portion independently of each other. And a flow switching valve that opens and closes the cutting portion on one side and opens and closes the branch pipe portion on the other side; It characterized Rukoto without suspension of water supply insert the fluid control valve device. 2. The piercing cylinder portion and the branch pipe portion communicate with each other through a branch communication port, and the second valve body has a valve body having a size sufficient to close the branch communication port. The uninterrupted water insertion fluid control valve device described. 3. A valve stem and two valve bodies, which are arranged on a central axis of a valve box body, said two valve bodies being screwed in common with said valve stem, A flow switching valve that is movable independently of each other in the valve box body and alternately opens and closes two valve openings.