JP5346271B2 - Branch pipe connection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch pipe connector which allows for the compact construction of a valve structure. <P>SOLUTION: The branch pipe connector is equipped with a branch case 1 which is attached surrounding a fluid pipe K, and is divided into plural branches in the circumferential direction of the fluid pipe K, a short pipe 2 whose end portion is sandwiched between the divided surfaces of the branch case 1 for connection, and a gate valve body 3 which is displaced between a closed position in which an internal communication between the branch case 1 and the short pipe 2 is cut off and an opening position in which the internal communication between the branch case 1 and the short pipe 2 is permitted. The gate valve body 3 is configured to be able to come in and out of the branch case 1 through a valve body insertion opening 16 formed to penetrate the branch case 1. The gate valve body 3 placed in the closed position closes the end portion of the short pipe 2 sandwiched between the divided surfaces. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a branch pipe connection device that enables a branch pipe to be connected to a fluid pipe.

  In recent years, in branch pipe connection work in which a branch pipe is provided in the middle of an existing fluid pipe such as a water pipe, the peripheral wall of the fluid pipe is perforated while maintaining the state of uninterrupted water without stopping the pipe on the upstream side, A method of connecting branch pipes is used. In such a construction method, as described in Patent Document 1 below, a branch case that surrounds a fluid pipe and is mounted in a watertight manner, and a gate valve that incorporates a gate valve body are used. The branch case is divided into a plurality of parts in the circumferential direction of the fluid pipe, and the branch pipe is connected to the branch case with a gate valve interposed therebetween.

  15 and 16 are front views showing a conventional branch pipe connecting device. This apparatus includes a bifurcated branch case 51 and a gate valve 52 flanged to the branch case 51. At the time of construction, first, as shown in FIG. 15, the branch case 51 is externally fitted to the fluid pipe K, and the divided surfaces are flange-connected and attached in a watertight manner. Subsequently, the flange 52 a of the gate valve 52 is connected to the flange 51 a of the branch case 51, and the flange 53 a of the punching device 53 is connected to the flange 52 b of the gate valve 52. These flanges are tightened by fasteners made of bolts or nuts.

  Next, the gate valve body built in the gate valve 52 is retracted upward, and the interior of the gate valve 52 is opened to a communication state. Then, a cylindrical cutter built in the punching device 53 is rotated, and the cutter is advanced by the feed handle 54 to punch the peripheral wall of the fluid pipe K. When drilling is completed, the rotation of the cutter is stopped, and the feed handle 54 is reversely rotated to retract the cutter. At this time, the cut piece of the peripheral wall of the fluid pipe K is collected by being caught by a drill protruding from the center position of the cutter.

  When the cutter is sufficiently retracted, the gate valve body that has been retracted upward is lowered to block the internal communication of the gate valve 52. Thereafter, as shown in FIG. 16, a branch pipe 55 is connected to the flange 52 b of the gate valve 52 instead of the punching device 53. In this example, the flange 56 a of the connection adapter 56 is connected to the flange 52 b of the gate valve 52, and the end of the branch pipe 55 is inserted and connected to the receiving port of the connection adapter 56. According to such a branch pipe connection method, the branch pipe can be connected without water shutoff, which is excellent in convenience.

  On the other hand, in the branch pipe connecting device described in the following Patent Document 2 by the present applicant, as shown in FIG. 17, the branch case 61 is divided into upper and lower parts, and the end of the gate valve 62 is sandwiched between the split surfaces and connected. doing. In such a configuration, unlike the apparatus of FIG. 16, the split surface of the branch case 61 that is flange-connected and the connection location between the branch case 61 and the gate valve 62 are not positioned perpendicular to the axial direction of the branch pipe. . Therefore, when a heavy load is generated due to ground fluctuation or secular change, the load is less likely to be applied in the direction in which the bolt of the fastener extends, and the opening of the split surface of the branch case 61 is suppressed, and the fluid in the fluid pipe K is suppressed. Can be effectively prevented.

  By the way, each of the branch pipe connecting devices described above has a structure in which a separate gate valve is connected to the branch case, and a space corresponding to the length of the gate valve (length L in FIG. 17) must be secured. Don't be. For this reason, the stroke of the cutter at the time of drilling becomes long, leading to an increase in the size of the drilling device, and in some cases, the punching device has to be specially customized. In addition, since such a gate valve is large and heavy, it is difficult to handle, which causes a decrease in work efficiency and an increase in cost, and the inventor of the present invention can make the valve structure compact. I thought about solving these problems.

In Patent Document 2, as shown in FIG. 18, a protrusion 66 provided on the outer peripheral surface of the gate valve 62 is fitted into a recess 65 formed in a branch case 61, and the recess 65 is inclined outwardly and opened outward. Although the method of pressing the inclined surface 66a of the projection 66 with the inclined surface 65a and fixing the gate valve 62 away from the branch case 61 is disclosed, the weight of the gate valve 62 is also difficult in executing this. It is easy to become. From this point of view, it is desirable to make the valve structure compact.
JP 2002-154004 A JP 2007-309474 A

  This invention is made | formed in view of the said situation, The objective is to provide the branch pipe connection apparatus which can comprise a valve structure compactly.

  The above object can be achieved by the present invention as described below. That is, the branch pipe connecting device according to the present invention is attached so as to surround the fluid pipe, and is divided into a plurality of branch cases divided in the circumferential direction of the fluid pipe, and an end portion is sandwiched between the split surfaces of the branch case. A partition valve body that is displaced between a closed position that blocks internal communication between the branch case and the connection pipe, and an open position that allows internal communication between the branch case and the connection pipe; The gate valve body is configured to be able to travel inside and outside the branch case through a valve body insertion port formed through the branch case, and the gate valve body in the closed position is sandwiched between the split surfaces. The end of the connecting pipe is closed.

  In this branch pipe connection device, a connection pipe, not a gate valve, is connected to the split surface of the branch case with the end portion interposed therebetween. The internal communication between the branch case and the connection pipe is switched by the displacement of the partition valve body that moves in and out of the branch case through the valve body insertion port, and the partition valve body in the closed position is Close the end. Thus, in the branch pipe connecting device of the present invention, the valve structure is provided at the connection point between the branch case and the connection pipe, and the gate valve as shown in FIGS. 16 and 17 is not necessary. The structure can be made compact.

  In the branch pipe connecting device of the present invention, it is preferable that the gap between the gate valve body and the connecting pipe in the closed position is sealed with a sealing material compressed in the axial direction of the connecting pipe. According to such a configuration, unlike the soft seal gate valve as shown in FIGS. 16 and 17, the gate valve body in the closed position does not have to be pressed strongly against the inner surface of the valve box (branch case or connecting pipe). A sealed state is obtained. Therefore, it is possible to reduce the torque when blocking the internal communication between the branch case and the connecting pipe, and to increase the effectiveness of the compact valve structure.

  In the branch pipe connecting device of the present invention, it is preferable that the gate valve body displaced to the closed position enters an insertion port formed through the peripheral wall at the end of the connection pipe and closes the inside of the connection pipe. . By inserting the gate valve body into the connection pipe, the internal communication between the branch case and the connection pipe can be appropriately blocked regardless of the direction in which the fluid flows.

  In the branch pipe connecting device according to the present invention, it is preferable that the gate valve body has an arm extending laterally and the displacement of the gate valve body can be operated via a valve rod connected to the arm. According to this configuration, the valve structure can be made more compact by suppressing the height of the valve stem. As a result, further weight reduction can be achieved, and it is easy to ensure the amount of earth covering even when the fluid pipe is buried in a shallow layer.

  In the branch pipe connecting device of the present invention, a guide surface inclined in the axial direction of the connection pipe along the displacement direction of the gate valve body is formed at a contact portion between the connection pipe and the gate valve body. Is preferred. According to such a configuration, when the gate valve body is displaced to the closed position, the gate valve body can be guided and properly positioned by the guide surface, and the completion of closing of the connecting pipe can be detected.

The perspective view which shows the branch pipe connection apparatus which concerns on 1st Embodiment of this invention. AA arrow sectional view of FIG. Plan view of branch case and short pipe with gate valve and valve lid removed Cross-sectional view of the main part showing the gate valve body in the closed position Perspective view of short pipe The figure explaining the positional relationship between a short pipe and a gate valve body (A) Plan view, (b) Front view, and (c) BB arrow sectional view of gate valve body Sectional view showing the state during installation of the branch case The figure which shows the state which connected the drilling device to the short pipe The figure which shows the state which connected the branch pipe to the short pipe The perspective view which shows the branch pipe connection apparatus which concerns on 2nd Embodiment of this invention. Diagram for comparing the positional relationship between the gate valve body and the valve stem Sectional drawing which shows the short pipe and gate valve body in 3rd Embodiment of this invention. FIG. 13 is a perspective view of the short pipe shown in FIG. Front view showing a conventional branch pipe connection device Front view showing a conventional branch pipe connection device Sectional view showing a conventional branch pipe connection device The principal part perspective view in an example of the branch pipe connection apparatus of the said patent document 2, (b) The figure which looked at the principal part from the right direction, and (c) The longitudinal cross-sectional view of the principal part

  Hereinafter, an embodiment of a branch pipe connection device according to the present invention will be described with reference to the drawings, taking as an example a case where a branch pipe is connected to an existing water pipe (an example of a fluid pipe).

[First Embodiment]
The branch pipe connecting device shown in FIGS. 1 and 2 is installed so as to surround a water pipe K which is an existing pipe, and is divided into a plurality of parts in the circumferential direction of the water pipe K, and a split surface of the branch case 1 10 includes a short pipe 2 (corresponding to a connection pipe) connected with an end portion sandwiched between 10 and a gate valve body 3 for switching internal communication between the branch case 1 and the short pipe 2. Further, this branch pipe connecting device has a valve rod 4 configured to be able to manipulate the displacement of the gate valve body 3 and a valve lid 5 that houses the gate valve body 3 in the open position.

  The branch case 1 is composed of divided bodies 1A and 1B that can be water-tightly attached to the water pipe K, and has a split T-shaped pipe shape that is split into two vertically in FIG. On the split surface 10 of the branch case 1, the flanges of the split bodies 1 </ b> A and 1 </ b> B are fastened by a fastener 11 composed of a bolt and a nut. By tightening the fastener 11, the dividing surface 10 is watertightly closed via the packings 12 and 13, and the short pipe 2 is connected to the branch case 1. A rib 14 is provided on the outer peripheral surface of the branch case 1 along the axis of the bolt of the fastener 11 in order to suppress the bending of the flange at the time of joining.

  In this branch pipe connecting device, since the dividing surface 10 of the branch case 1 is positioned in a substantially horizontal direction, even if a large load is generated due to ground fluctuation or secular change, the load is applied in the direction in which the bolt of the fastener 11 extends. It is difficult to act and water leakage can be effectively prevented by suppressing the unexpected opening of the dividing surface 10. On the end face of the branch case 1 on the short tube 2 side, an extending portion 15 having an enlarged-diameter concave portion inside is formed, and used to fix the short tube 2 to the branch case 1 as will be described later. The

  As shown in FIG. 3, the valve body insertion port 16 formed through the branch case 1 is formed in the vicinity of the end surface of the branch case 1 on the short pipe 2 side, and has a shape corresponding to the gate valve body 3. Yes. The gate valve body 3 can be moved up and down through the valve body insertion port 16 and can travel inside and outside the branch case 1. FIG. 2 shows a state where the gate valve body 3 is raised and in the open position. When the gate valve body 3 is lowered, the gate valve 3 is moved to the closed position shown in FIG. Block. Thus, the gate valve body 3 is displaced between the closed position where the internal communication between the branch case 1 and the short pipe 2 is blocked and the open position where the internal communication between the branch case 1 and the short pipe 2 is allowed. .

  In this branch pipe connection device, since the valve structure is provided at the connection point between the branch case 1 and the short pipe 2, the standard-use gate valve (see FIGS. 16 and 17) used in the past is unnecessary. The valve structure can be made compact and can contribute to cost reduction. Further, since the short pipe 2 is shorter than a standard product gate valve, the stroke of the cutter when the water pipe K is drilled can be shortened, and a small drilling device can be used. Furthermore, since the short tube 2 is small and lightweight, it is easy to handle, and the working efficiency can be improved.

  In this embodiment, as shown in FIG. 5, the short pipe 2 has a flange 21 at the end opposite to the side sandwiched by the dividing surface 10, and a drilling device or a branch pipe is attached to the flange 21. Can be connected directly or indirectly. The end of the short pipe 2 is not limited to the flange shape, and for example, it can be formed into a receiving shape into which the insertion end of the branch pipe can be inserted, and further in other shapes such as a receiving port with a flange. It does not matter.

  An insertion port 22 is formed through the upper peripheral wall at the end of the short tube 2 on the side sandwiched between the split surfaces 10. The insertion port 22 is notched in a groove shape along the circumferential direction, and has a shape that allows entry from above the gate valve body 3. In a state where the short pipe 2 is connected to the branch case 1, the insertion port 22 is arranged inside the valve body insertion port 16, and the gate valve body 3 that is displaced to the closed position via the valve body insertion port 16 is inserted into the insertion port. 22 enters and closes the inside of the short pipe 2. FIG. 6 is a view of the short pipe 2 and the gate valve body 3 as viewed from the right direction in FIG. 2, and the short pipe 2 is shown in a cross section cut at the insertion port 22. A chip discharge port 23 is formed through the peripheral wall of the lower portion of the short tube 2 so as to face the insertion port 22.

  In this embodiment, the projections 25 are formed on the outer peripheral surface of the short tube 2, and the short tube 2 is positioned in the circumferential direction by fitting it into the recess of the extending portion 15 formed in the branch case 1. . Further, when the fastener 11 is tightened to narrow the interval between the divided bodies, the concave portion of the extending portion 15 presses the projection 25 and the short tube 2 is moved away from the branch case 1 as described with reference to FIG. Along with this operation, the overhanging portion 26 engages with the inner surface of the branch case 1, and the short pipe 2 is positioned in the axial direction. The short pipe 2 is much lighter than a standard gate valve and can perform such work relatively easily.

  As shown in FIG. 7, the gate valve body 3 includes a disk-shaped body 31, a head 32 that protrudes upward from the body 31, and a pair of arms 33 that extend laterally from the body 31. For example, it can be produced by applying rubber lining to the entire surface of a cored bar component such as a steel plate. An annular sealing rubber 34 (corresponding to a sealing material) is formed on both surfaces of the body 31. In this embodiment, the seal rubber 34 is provided integrally with the lining rubber, and the locally raised portion of the lining rubber is used as the seal rubber 34.

  The seal rubber 34 is in close contact with an annular seal surface 27 (see FIG. 6) disposed opposite to both surfaces of the body 31, and between the gate valve body 3 and the short pipe 2 in the closed position as shown in FIG. To seal. When the pressure of the flowing water along the axial direction of the short pipe 2 acts on the body 31, the seal rubber 34 is compressed in the axial direction of the short pipe 2 and the water stoppage is enhanced. In this embodiment, since the gate valve body 3 is inserted inside the short pipe 2, the sealing function can be surely exhibited regardless of the direction of water flow. Such a seal rubber may be attached to the short tube 2.

  In this device, as long as the gate valve body 3 is displaced to the closed position, the gap between the gate valve body 3 and the short pipe 2 is sealed, and the internal communication between the branch case 1 and the short pipe 2 is ensured. Can be blocked. Therefore, the gate valve 3 is not pressed against the inner surface of the short pipe 2 to compress the sealing material, and therefore the torque at the time of closing can be reduced. On the other hand, in the above-mentioned standard soft seal gate valve, torque is apt to increase because the gate material is strongly pressed against the valve box to compress the sealing material. However, the present invention does not exclude the adoption of such a seal structure.

  The valve rod 4 is connected to the head 32 of the gate valve body 3, and the valve rod 4 is arranged at the center position of the gate valve body 3 in this embodiment. In the space portion 36 formed in the head 32, a screw top 37 screwed into the valve stem 4 is fitted with play, and thereby the gate valve body 3 is connected to the valve stem 4 of the short pipe 2. A play is provided that is movable in the axial direction. As a result, the gate valve body 3 can be slid according to the direction in which the water flows, and the sealing rubber 34 can be efficiently compressed to increase the water stoppage.

  A guide surface 35 that is inclined in the axial direction of the short pipe 2 along the displacement direction of the gate valve body 3 is formed at the lower portion of the head 32 that is a contact portion with the short pipe 2. On the other hand, the short pipe 2 is formed with a guide surface 24 having an inclination coincident with the guide surface 35 at a contact portion with the gate valve body 3. When the gate valve body 3 is displaced to the closed position, the gate valve body 3 can be guided and properly positioned by the contact of the guide surfaces 24 and 35, and the completion of the closing of the short pipe 2 can be detected. The pair of arms 33 function as a guide for preventing rotation of the gate valve body 3.

  The valve stem 4 is a male screw member extending along the displacement direction of the gate valve body 3, and is fixed to the valve lid 5 with the top portion 41 protruding outside. A jig (not shown) such as a handle is attached to the top 41 of the valve stem 4. When the valve stem 4 is rotated through the jig, the gate valve body 3 is interlocked with the vertical movement of the screw top 37. Goes up and down. That is, the displacement of the gate valve body 3 can be operated via the valve rod 4. The valve lid 5 includes the valve stem 4 and is erected on the branch case 1 so as to cover the valve element insertion port 16.

  A method of connecting a branch pipe to an existing water pipe K using this branch pipe connection device will be described with an example. First, as shown in FIG. 8, the short pipe 2 is temporarily placed beside the water pipe K, and the branch case 1 is externally fitted to the water pipe K and attached. The end portion of the short tube 2 is sandwiched between the split surfaces 10 of the branch case 1 and the fasteners 11 are tightened to be connected in a watertight manner. At this time, the tip of the gate valve body 3 slightly lowered is inserted into the insertion port 22 of the short pipe 2, and the branch case 1 is joined in this state, whereby the short pipe 2 is easily centered. .

  Next, from the state shown in FIGS. 1 and 2, a punching device 45 is connected to the short pipe 2 as shown in FIG. 9, and the peripheral wall of the water pipe K is punched by the cutter 46. Since the stroke of the cutter 46 can be shortened as compared with the case where a standard product gate valve is used, a small punching device 45 can be used. When the drilling is completed, the rotation of the cutter 46 is stopped, and after the cutter 46 is sufficiently retracted, the gate valve body 3 is displaced to the closed position as shown in FIG. The gate valve body 3 may be lowered until the guide surface 35 contacts the guide surface 24 of the short pipe 2.

  As shown in FIG. 3, a discharge hose 18 having a ball valve 17 is connected to the split body 1 </ b> B of the branch case 1, and chips generated at the time of drilling are discharged to the outside together with water flowing into the branch case 1. it can. At this time, the chips falling on the inner surface of the short pipe 2 flow into the lower part of the branch case 1 through the chip discharge port 23 and are discharged through the discharge hose 18.

  Subsequently, as shown in FIG. 10, the punching device 45 is removed from the short tube 2, and a branch tube 47 is connected instead. Thereafter, if the gate valve body 3 is displaced to the open position, water is diverted from the water pipe K to the branch pipe 47.

[Second Embodiment]
Since the second embodiment has the same configuration and operation as the first embodiment except for the configuration described below, common points will be omitted and differences will be mainly described. The same members as those described in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  As shown in FIGS. 11 and 12, in this embodiment, the gate valve body 7 has a pair of arms 73a and 73b extending laterally from the body 71, and the valve rod 4 is connected to one of the arms 73b. doing. The valve stem 4 is screwed into a screw top fitted into the arm 73 b or the arm 73 b itself, and the displacement of the gate valve body 7 can be operated via the valve stem 4. The other arm 73 a functions as a guide for preventing rotation of the gate valve body 7. The branch case 1 is formed with a valve body insertion port having a shape corresponding to the gate valve body 7.

  In the gate valve body 3 shown in the first embodiment described above, the valve stem 4 is attached to the head 32, whereas in the gate valve body 7 of this embodiment, the valve stem 4 is attached to the arm 73b. The height of the valve stem 4 is suppressed, and the valve structure can be configured more compactly. The protruding height H2 of the valve stem 4 is lower than the protruding height H1, and the valve lid 6 rises from the branch case 1 smaller than the valve lid 5. As shown in FIG. 12 (b), the valve stem 4 is shifted from the center position of the gate valve body 7, and the short pipe 2 does not interfere with the extending direction of the valve stem 4.

[Third Embodiment]
Since the third embodiment has the same configuration and operation as the first embodiment except for the configuration described below, common points will be omitted and mainly the differences will be described. The same members as those described in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  In 1st Embodiment mentioned above, although the example which inserts the gate valve body 3 displaced to a closed position in the inside of the short tube 2 was shown, in this embodiment, as shown in FIG. 13, the end surface of the short tube 8 is shown. The end portion of the short pipe 8 is closed by bringing the gate valve body 9 into close contact therewith. Since the short tube 8 is not formed with an insertion opening, it can be manufactured more easily than the short tube 2. An annular seal rubber 94 (corresponding to a seal material) is formed in the gate valve body 9 at a position facing the end face of the short pipe 8, and this is compressed in the axial direction of the short pipe 2 by the water pressure from the water pipe K. Thus, the gap between the gate valve 9 and the short pipe 8 in the closed position can be sealed.

  As shown in FIG. 14, a pair of valve body holding protrusions 88 are provided on the end face of the short pipe 8, and the guides are inclined in the axial direction of the short pipe 8 along the displacement direction of the gate valve body 9. A surface 84 is formed. Further, in the gate valve body 9, a surface on the water pipe side locally rises, and a guide surface 95 having an inclination that matches the guide surface 84 is formed. When the gate valve body 9 is displaced to the closed position, the gate valve body 9 is appropriately positioned by the contact of the guide surfaces 84 and 95, the wedge valve body 9 is brought into close contact with the end surface of the short pipe 8 by the wedge action, Completion of the closing of the short tube 8 can be sensed.

[Another embodiment]
(1) The present invention is not limited to the embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention. Therefore, for example, the branch case may be divided into three parts. In that case, the dividing surface that sandwiches the end of the connecting pipe is arranged in a substantially horizontal direction, and the remaining two are placed on the opposite side of the connecting pipe. It is preferable to arrange the dividing surfaces apart from each other in the vertical direction.

  (2) In the above-described embodiment, when connecting the short pipe 2 that is a connecting pipe to the branch case 1, the example in which the protrusion 25 is fitted and fixed in the concave portion of the extending portion 15 has been shown. It is not limited to this. For example, a protrusion having a tapered peripheral wall surface may be formed on the extending part of the branch case, and the protrusion may be fitted into a recess on the outer peripheral surface of the connection pipe. In this case, using the surface contact between the peripheral wall surface of the protrusion and the wall surface of the recess, the split surface of the branch case can be closed smoothly while being guided. Examples of the shape of the protrusion include a conical shape and a hemispherical shape, and examples of the shape of the concave portion include a conical shape and a V-groove shape.

  (3) In the present invention, the fluid pipe to which the branch case is attached is not limited to a water pipe, and may be a fluid pipe through which various liquids and gases flow.

1 Branch case 2, 8 Short pipe (connecting pipe)
3, 7, 9 Gate valve 4 Valve stem 5, 6 Valve cover 10 Dividing surface 16 Valve body insertion port 22 Insertion ports 24, 35, 84, 95 Guide surfaces 33, 73a, 73b Arms 34, 94 Seal rubber (on seal material) Equivalent)
45 Punching device 47 Branch pipe K Water pipe (fluid pipe)

Claims (5)

A branch case, which is mounted around the fluid pipe and divided into a plurality of parts in the circumferential direction of the fluid pipe;
A connecting pipe connected with the end portion sandwiched between the split surfaces of the branch case; and
A gate valve body that is displaced between a closed position that blocks internal communication between the branch case and the connection pipe, and an open position that allows internal communication between the branch case and the connection pipe, and
The gate valve body is configured to be able to travel inside and outside the branch case through a valve body insertion port formed through the branch case, and the gate valve body in a closed position is sandwiched between the split surfaces. A branch pipe connection device that closes the end of the connection pipe.   The branch pipe connection device according to claim 1, wherein a gap between the gate valve body and the connection pipe in a closed position is sealed with a sealing material compressed in an axial direction of the connection pipe.   3. The branch pipe connecting device according to claim 1, wherein the gate valve body displaced to a closed position enters an insertion port formed through a peripheral wall of an end portion of the connection pipe and closes the inside of the connection pipe. .   The branch according to any one of claims 1 to 3, wherein the gate valve body has an arm extending laterally and the displacement of the gate valve body can be operated via a valve rod connected to the arm. Pipe connection device.   The guide surface which inclined in the axial direction of the said connection pipe along the displacement direction of the said gate valve body is formed in the contact site | part of the said connection pipe and the said gate valve body in any one of Claims 1-4. The branch pipe connecting device described.

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