JP2007298181A - Flow channel shutoff device in tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently, surely and easily perform a flow channel shutoff work between joining faces of both connection flange portions with small labor hour while preventing leakage of the fluid in a pipe, in comparison with a conventional method by inserting and operating a shutoff valve against a pressure of the fluid jetting to the external from a clearance between the joining faces of both connection flange portions. <P>SOLUTION: A shutoff work cover B is disposed on both pipe portions 2, 3 fastened and connected by a fastening tool 5 while disposing a sealant 4 between the joining faces of both connection flange portions 2A, 3A, in a state of surrounding outer peripheries of both connection flange portions 2A, 3A in a sealed state while permitting loosening operation of the fastening tool 5, and allowing a thin plate-shaped partitioning plate valve 8 capable of shutting off a flow channel W of both pipe portions 2, 3 to be inserted and dismounted, and the partitioning plate valve 8 of the shutoff work cover B is inserted to a flow channel shutoff position through the clearance S between both connection flange portions 2A, 3A generated by the loosening operation of the fastening tool 5, thus the flow channel is shut off between both connection flange portions 2A, 3A. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, among the constituent members of a fluid piping system such as a water pipe system, the connecting flange portions of both pipe portions are tightened and connected with a fastener with a sealing material interposed between their joint surfaces. The present invention relates to a flow path blocking method for blocking a flow path for replacement of a repair valve, a fire hydrant, an air valve, and the like located downstream of the flange joint, and an improvement in a pipe flow path blocking device used therefor.

  In a conventional fluid piping system flow path blocking method, for example, leakage or failure due to deterioration of a repair valve, a fire hydrant, etc., connected to the downstream pipe part of the flange joint or constituting the downstream pipe part itself occurs. When it is necessary to replace the valve with a new repair valve or the like, as shown in FIGS. 19 and 20, as shown in FIGS. 19 and 20, the upstream pipe portion 2 is made of stainless steel that can be applied to the outer peripheral surface thereof from the outside in the radial direction. A pair of holding belts 100 and a band 103 made up of a drawing bolt 101 and a nut 102 for attaching and holding the ends of both holding belts 100 to the holding side are attached.

  Each of the drawing bolts 101 of the band 103 has a notch formed at both ends in the longitudinal direction of a thin plate-like partition plate valve (water stop plate) 104 that can shut off the flow paths of the pipe portions 2 and 3. A temporary fixing bolt 106 screwed with a nut 105 that can be engaged with the mating recess 104a is attached so as to freely swing up and down, and the lower surface of the partition plate valve 104 is connected to the upstream pipe portion 2. An L-shaped locking piece 107 that is engaged with the flange portion 2A from the radially outer side is fixed.

  Next, among the four sets of fastening bolts 109 and nuts 110 constituting the fastener 108 for fastening and connecting the connecting flange portions 2A and 3A of the pipe portions 2 and 3, the partition plate valve 104 is in the insertion movement path. The two sets of fastening bolts 109 and nuts 110 on one center line located at the center are removed, and the two sets of fastening bolts 109 and nuts 110 on the other center line perpendicular to the insertion direction of the partition plate valve 104 are gradually loosened. While operating, the partition plate valve 104 was inserted between the connecting flange portion 2A of the upstream pipe portion 2 and the plate packing 111 which is an example of the sealing material interposed between the joining surfaces, and then inserted. Both temporary fixing bolts 106 of the band 103 are engaged with both engaging recesses 104a of the partition plate valve 104, and a nut 105 screwed into the band 103 is screwed to the tightening side, so that the upstream pipe portion 2 By forming a flange portion 2A in abutting fixed gate plate valve 104 to stop water.

  Next, the two sets of fastening bolts 109 and nuts 110 on the other center line are also removed, the old plate packing 111 and the repair valve are removed, the new plate packing 111 and the repair valve are mounted, and the two sets on the other center line are installed. The fastening bolt 109 and the nut 110 are attached in a temporarily fixed state, and both the temporary fixing bolts 106 are extracted from the both engaging recesses 104 a of the partition plate valve 104.

  In this state, the partition valve 104 is pulled out while adjusting so that the plate packing 111 is not displaced, and then two sets of fastening bolts 109 and nuts 110 on the other center line are finally tightened, and two sets on one center line are set. The fastening bolt 109 and the nut 110 are attached and finally tightened (see Non-Patent Document 1).

The 45th National Waterworks Research Conference May 1994 (5-34) Replacing Fire Hydrant with Unrestricted Water

  In the conventional fluid piping system flow path blocking method, not only the repair valve can be replaced in an uninterrupted water state, but also the connecting flange portions 2A and 3A of both pipe portions 2 and 3 are tightened and connected. Of the bolts 109 and nuts 110, after removing the fastening bolts 109 and nuts 110 located in the insertion path of the partition plate valve 104, the other fastening bolts 109 and nuts 110 are loosened, and the loosening operation is performed. By inserting the partition plate valve 104 through the gap between the generated connecting flange portions 2A and 3A, the flow path in the pipe can be shut off, so that the construction cost can be reduced and the construction period can be shortened. On the other hand, at the moment when the fastening bolt 109 and the nut 110 are loosened, the fluid in the pipe is ejected to the outside through the gap formed between the two connecting flange portions 2A and 3A. Not Rubakari, jetting fluid becomes pledged resistance of the partition plate valve 104, moreover, the two joining flange portions 2A, it is necessary to reduce the gap between 3A utmost easily it took much time to pledge operation of the partition plate valve 104.

  In particular, the plate packing 111 interposed between the joint surfaces of the two connecting flange portions 2A and 3A undulates, or a part of the plate packing 111 is pasted between the joint surfaces of the two connecting flange portions 2A and 3A. In the case where it is attached, the partition plate valve 104 is inserted while pushing part of the plate packing 111, so that the total amount of fluid in the pipe until the pipe flow path is shut off increases.

  The present invention has been made in view of the above situation, and the main problem is that the cover plate valve is inserted against the pressure of the fluid ejected to the outside from the gap between the joint surfaces of the two connecting flange portions. Compared to the conventional method to operate, the fluid piping system that can efficiently and reliably and easily perform the flow path blocking work between the joint surfaces of both connecting flanges with less labor while suppressing leakage of fluid in the pipe It is in providing a flow path blocking method and an in-pipe flow path blocking device.

  According to a first characteristic configuration of the present invention, in the fluid piping system, the fastener is loosened in both pipe portions that are fastened and connected by a fastener in a state in which a sealing material is interposed between the joint surfaces of the both connecting flange portions. A shut-off work cover in which the outer peripheries of both connecting flanges can be enclosed in a sealed state while permitting operation, and a thin plate-like partition plate valve capable of shutting off the flow path of both pipes is provided to be freely inserted and removed. And insert the partition valve of the shut-off work cover through the gap between the two connecting flanges generated by the loosening operation of the fastener to the channel shut-off position to It is in the point to block.

According to the above characteristic configuration, for example, leakage or failure due to deterioration of a repair valve, a fire hydrant, etc. connected to the downstream pipe part of the flange joint portion of both pipe parts or constituting the downstream pipe part itself has occurred. When it is necessary to replace with a new repair valve, fire hydrant, etc., install a shut-off work cover on both pipe parts, seal the outer periphery of both connecting flange parts, and tighten the connecting flange parts on both pipe parts Loosen the connected fasteners. Although the fluid that has flowed out from the gap between the two connecting flanges with this loosening operation fills the blocking work cover, it does not leak to the outside, or the amount of fluid leakage to the outside can be greatly reduced. .
Therefore, it is possible to make the gap between the connecting flange portions sufficiently larger than the plate thickness of the partition valve, and when the fluid is filled in the shut-off work cover, it is substantially equal to the pipe internal pressure. For this reason, the thin plate-like partition plate valve provided in the blocking work cover can be reliably and smoothly inserted into the flow path blocking position through the gap between the two connecting flange portions.

  Therefore, unlike the conventional method, it is not necessary to insert and operate the partition plate valve against the pressure of the fluid ejected to the outside from the gap between the joint surfaces of both connection flange portions, and between the joint surfaces of both connection flange portions. The flow path blocking operation can be performed efficiently, reliably and easily with less effort while suppressing leakage of the fluid in the pipe.

  According to a second characteristic configuration of the present invention, the gap forming means provided in the blocking work cover pushes and spreads between the connecting flange portions within the range of the loosening operation allowance of the fastener, and then the partition plate of the blocking work cover The valve is inserted into the flow path blocking position through the gap between the connecting flange portions.

  According to the above-mentioned characteristic configuration, even if the fasteners that tighten and connect the connecting flange portions of both pipe portions are loosened, a gap corresponding to the loosening operation allowance is not formed between the two connecting flange portions, or Even if the connecting flange portion of the upstream pipe portion tilts with respect to the connecting flange portion of the downstream pipe portion within the accommodation range existing at the flange joint location, the fastener is formed by the gap forming means provided in the blocking work cover. By forcibly expanding the gap between both connecting flanges within the range of the loosening operation allowance, a gap equivalent to the loosening operation allowance can be reliably formed between both connecting flanges, so it is attached to both pipe parts. While the outer periphery of both connecting flanges is surrounded in a sealed state by the shut-off work cover, the partition valve provided on the shut-off work cover is surely reached to the flow path shut-off position through the gap between both connection flange parts, It is possible to operate inserted into the Meuse.

  According to a third characteristic configuration of the present invention, both the connecting flange portions are connected to both pipe portions that are fastened and connected by a fastener with a sealing material interposed between the joint surfaces of the both connecting flange portions. A thin plate-shaped partition valve that can be inserted and moved to a position that blocks the flow path in the pipe through the gap between the two connecting flanges generated by the loosening operation of the fastener, on the shut-off work cover that can be mounted with the outer periphery sealed. A sliding guide means is provided for sliding and guiding the partition valve to the flow path blocking position and the flow path opening position in a sealed state.

According to the above characteristic configuration, for example, leakage or failure due to deterioration of a repair valve, a fire hydrant, etc. connected to the downstream pipe part of the flange joint portion of both pipe parts or constituting the downstream pipe part itself has occurred. When it is necessary to replace with a new repair valve, fire hydrant, etc., install a shut-off work cover on both pipe parts, seal the outer periphery of both connecting flange parts, and tighten the connecting flange parts on both pipe parts Loosen the connected fasteners. Although the fluid that has flowed out from the gap between the two connecting flanges with this loosening operation fills the blocking work cover, it does not leak to the outside, or the amount of fluid leakage to the outside can be greatly reduced. .
Therefore, it is possible to make the gap between the connecting flange portions sufficiently larger than the plate thickness of the partition valve, and when the fluid is filled in the shut-off work cover, it is substantially equal to the pipe internal pressure. Therefore, the thin plate-like partition plate valve provided in the shut-off work cover is securely and smoothly inserted to the flow path shut-off position through the gap between the two connecting flange portions while being slid and guided by the slide guide means. be able to.

  Therefore, unlike the conventional method, it is not necessary to insert and operate the partition plate valve against the pressure of the fluid ejected to the outside from the gap between the joint surfaces of the two connecting flange portions, and the partition plate valve is allowed to flow in a sealed state. Since it can smoothly slide and guide between the channel blocking position and the channel opening position, the channel blocking work between the joint surfaces of both connecting flanges can be performed efficiently with less labor while suppressing leakage of fluid in the pipe. It can be done reliably and easily.

  A fourth characteristic configuration according to the present invention is that a plurality of gap forming means are provided at a plurality of locations in the circumferential direction of the blocking work cover so as to push between the connecting flange portions within the range of the loosening operation allowance of the fastener. .

  According to the above-mentioned characteristic configuration, even if the fasteners that tighten and connect the connecting flange portions of both pipe portions are loosened, a gap corresponding to the loosening operation allowance is not formed between the two connecting flange portions, or Even if the connecting flange part of the upstream pipe part tilts with respect to the connecting flange part of the downstream pipe part within the accommodation range existing at the flange joint part, gap formation provided at a plurality of circumferential directions of the blocking work cover By means of forcibly expanding between the connecting flange portions within the range of the loosening operation allowance of the fastener, a gap corresponding to the loosening operation allowance can be reliably formed between the two connecting flange portions, Since the opening width in the circumferential direction of the gap can be equalized, the shielding work covers attached to both pipe parts can be installed on the shielding work cover while surrounding the outer periphery of both connecting flange parts in a sealed state. Is the gate plate valve is completely up to the flow path blocking position through the gap between the two joining flange portions can be manipulated insertion smoothly.

  According to a fifth characteristic configuration of the present invention, the blocking work cover includes an annular elastic sealing material having an annular sealing portion that is pressed against the outer peripheral surface of each connecting flange portion by an elastic force, and the annular elastic sealing material has a diameter. It is composed of a clamping ring having a divided structure that is clamped and fixed from the outside in the direction, and an opening that allows the partition plate valve to be inserted and moved is formed in the annular elastic sealing material and the clamping ring.

  According to the above characteristic configuration, when the annular elastic sealing material, which is one component of the blocking work cover, is sheathed on both pipe portions, the elasticity when the annular sealing portion is pressed against the outer peripheral surface of each connecting flange portion. Since both the tube portions can be temporarily held by force, not only the position adjustment of the annular elastic sealing material itself but also the mounting operation of the clamping ring of the divided structure to the annular elastic sealing material can be easily performed. Nevertheless, the outer periphery of both the connecting flange portions can be securely and firmly surrounded in a sealed state by the annular elastic sealing material and the split ring.

  According to a sixth characteristic configuration of the present invention, an annular second seal portion that is in contact with the inner peripheral surface of the annular elastic sealing material over the adjacent portions of the outer peripheral surfaces of the two connecting flange portions is integrally formed. An opening that allows insertion movement of the partition plate valve is formed in a part of the valve.

  According to the above characteristic configuration, the second sealing portion of the annular elastic sealing material can preliminarily close between the two connecting flange portions excluding the insertion movement position of the partition plate valve, so that the sealing work cover is sealed. Can increase the sex.

According to a seventh characteristic configuration of the present invention, the gap forming means includes a plurality of taper surfaces that enter and move from the outside in the radial direction with respect to the gap between the connecting flange portions at a plurality of locations in the circumferential direction of the blocking work cover. It is in the point comprised from the isolation | separation bolt.
According to the above characteristic configuration, by tightening a plurality of separation bolts provided at a plurality of locations in the circumferential direction of the blocking work cover, the space between both connecting flange portions is expanded within the range of the loosening operation allowance of the fastener, It is possible to equalize the opening width in the circumferential direction of the gap between the two connecting flange portions.

  According to an eighth feature of the present invention, the separation bolt of the gap forming means is attached to the tightening ring in a state where the bolt shaft core is positioned on or near a plane passing through the moving plane of the partition plate valve. In the point.

  According to the above characteristic configuration, when a plurality of separation bolts provided at a plurality of locations in the circumferential direction of the shut-off work cover are tightened to expand between the connecting flange portions within the range of the loosening operation allowance of the fastener, The moving plane of the partition plate valve is positioned at or near the center position of the widened gap, and the partition plate valve can be smoothly inserted.

  According to a ninth characteristic configuration of the present invention, the fastener has a bolt in which an O-ring for sealing between the outer surface of one connecting flange portion is provided on the contact surface of the head and the other connecting flange. The O-ring for sealing between the outer surfaces of a part is comprised from the cap nut provided in the contact surface.

  According to the above characteristic configuration, for example, leakage or failure due to deterioration of a repair valve, a fire hydrant, etc. connected to the downstream pipe part of the flange joint portion of both pipe parts or constituting the downstream pipe part itself has occurred. When it is necessary to replace with a new repair valve, fire hydrant, etc., install a shut-off work cover on both pipe parts, seal the outer periphery of both connecting flange parts, and tighten the connecting flange parts on both pipe parts Loosen the connected fasteners. Even if a clearance is generated between the two connecting flange portions as a result of this loosening operation, the contact between one connection flange portion and the bolt head and the contact between the other connection flange portion and the cap nut are maintained. Therefore, the fluid leakage through the bolt insertion hole penetratingly formed in the connecting flange portion can be suppressed by the O-ring located between the contact surfaces.

[First Embodiment]
1 and 2 show a pipe connection structure in a fluid piping system, and a branch pipe part 2 as an upstream pipe part integrally formed in the middle of a water pipe 1 made of cast iron pipe which is an example of a fluid pipe. A plurality of sets of the above-described connecting flange portions 2A with the upstream side connecting flange portion 3A of the connecting pipe 3 serving as the downstream side pipe portion interposed between the joint surfaces of the sheet packing 4 as an example of a sealing material In the embodiment, four sets of bolts 5 </ b> A and cap nuts 5 </ b> B are fastened and detachably connected in a sealed state with a first fastener 5, and the downstream side connection flange portion 3 </ b> B of the connection pipe 3 has a fluid From a plurality of sets of bolts 7A and nuts 7B in a state in which the upstream connecting flange portion 6A of the repair valve 6 which is an example of equipment or piping material is interposed between the joint surfaces thereof and the sheet packing 4 which is an example of a sealing material. In a sealed state with the second fastener 7 Wear is freely tightened connection, further, the downstream joining flange portion 6B of the repair valve 6, which is an example of a fluid apparatus or piping material optionally fire hydrants or the like is detachably fastened connected sealingly.

  Further, the repair valve 6 needs to be replaced at a portion extending between the branch pipe portion 2 and the connecting pipe 3 due to water leakage or failure due to deterioration while maintaining an undisturbed water state in which the flow of clean water in the water pipe 1 is maintained. In the pipe in the direction of the branch axis X2 perpendicular to the pipe axis X1 of the water pipe 1 between the connection flange part 2A of the branch pipe part 2 and the upstream side connection flange part 3A of the connection pipe 3 An in-pipe flow path blocking device A that blocks the flow path W is assembled.

  As shown in FIGS. 1 to 9, the in-pipe flow path blocking device A is detachable with respect to the branch pipe part 2 and the connecting pipe 3 in a state where the outer periphery of both the connecting flange parts 2A and 3A is sealed. The in-pipe flow path W is blocked through the clearance S between the joint surfaces of the two connecting flange portions 2A and 3A generated by the loosening operation of the blocking work cover B that can be attached to the bolt 5A and the cap nut 5B of the first fastener 5. The main components are a thin plate-like partition plate valve 8 that can be inserted and moved to a position, and a sliding guide means C that slides and guides the partition plate valve 8 to a flow passage blocking position and a flow passage opening operation position in a sealed state. It is provided, and at a plurality of locations in the circumferential direction of the blocking work cover B (three locations in the circumferential direction in the embodiment) within the range of the loosening operation allowance of the bolt 5A and the cap nut 5B of the first fastener 5 Push between the joint surfaces of both connecting flanges 2A, 3A Gap forming means D is provided to widen.

  The first fastener 5 includes a plurality of bolts 5C and 5D having a normal specification (four sets in the present embodiment) and a plurality of bolts 5A and 5D having a waterproof specification having excellent sealing function (four sets in the present embodiment). It consists of a cap nut 5B. At the start of replacement work, the repair valve 6 is replaced with a normal specification bolt 5C, 5D with a waterproof specification bolt 5A and a cap nut 5B. Replace the nut 5B with normal bolts 5C and 5D.

    As shown in FIGS. 1 to 6, the blocking work cover B has a substantially semicircular annular first cross-sectional view that can be pressed against the outer peripheral surfaces of the connecting flange portions 2 </ b> A and 3 </ b> A from the outside in the radial direction. The seal portion 11a and the connecting flange portions 2A, 3A can be press-contacted from the outside in the radial direction in a state where a part of the annular recess 25 is formed to open radially outward between the adjacent outer peripheral surfaces of the seal portion 11a An annular elastic sealing material 11 provided with an annular second seal portion 11b having a substantially semicircular shape in cross-sectional view, and a two-part structure fastening ring 12 for fastening and fixing the annular elastic sealing material 11 from the outside in the radial direction. Has been.

  As shown in FIGS. 6 to 9, the annular elastic sealing material 11 is branched between the connecting flange portions 2 </ b> A and 3 </ b> A when a set maximum gap S into which the partition plate valve 8 can be inserted is formed between the joint surfaces. A width direction corresponding to the center position between adjacent ones of the connecting flange portions 2A and 3A on the inner peripheral surface thereof, which is integrally formed in an annular shape with a width equal to or substantially equal to the outer surface interval in the direction of the axis X2. The first seal portion 11a is integrally formed at both side positions in the width direction corresponding to the outer peripheral surfaces of the respective connecting flange portions 2A and 3A. And the minimum inner diameter of both the first seal portions 11a and the minimum inner diameter of the second seal portions 11b are the outer diameters of the outer peripheral surfaces of the connecting flange portions 2A and 3A. It is made smaller than.

  In addition, an opening 11c that allows the partition plate valve 8 to be inserted and moved is formed in a part of the second seal portion 11b of the annular elastic sealing material 11, and a portion and an opening located on both sides in the circumferential direction of the opening 11c. Through holes 11d through which the distal ends of the separation bolts 13 constituting the gap forming means D penetrate from the outside in the radial direction are formed at a total of three locations that are opposite to the portion 11c in the radial direction.

  As shown in FIGS. 1 to 6, the tightening ring 12 is a pair of substantially semicircular arc-shaped tightening divisions configured to have a width in the branch axis X2 direction larger than the width in the branch axis X2 direction of the annular elastic sealing material 11. Of the connecting pieces 12B fixed to both ends in the circumferential direction of the ring 12A and each tightening split wheel 12A, from the bolts 12C and nuts 12D for pulling and fixing the connecting pieces 12B facing each other in the direction of inserting and removing the partition plate valve When the bolt 12C and the nut 12D are tightened with the set torque, the relative disengagement movement by the water pressure between the branch pipe portion 2 and the connecting pipe 3 accompanying the loosening operation of the first fastener 5 is permitted. The two first seal portions 11a of the annular elastic seal material 11 are hermetically pressed against the outer peripheral surfaces of the two connecting flange portions 2A and 3A with a set pressure contact force, and at the same time, the second seal portions 11b of the annular elastic seal material 11 are both connected. Flange portions 2A, and is configured to be sealed pressed by setting the annular recess 25 press-contact force between adjacent 3A.

  Further, in one of the clamped divided wheels 12A, a similarity that is slightly larger than the cross-sectional shape of the valve plate 8A of the partition plate valve 8 is provided at a circumferentially central position opposed to the opening 11 of the annular elastic seal material 11 in the radial direction. And a slit-like opening 12a having a function of slidingly guiding the insertion / removal movement of the partition plate valve 8 is formed so as to penetrate therethrough, and each through-hole 11d of the annular elastic sealing material 11 in both tightening split rings 12A. At three locations in the circumferential direction opposite to each other in the radial direction, through holes 12b through which the separation bolts 13 constituting the gap forming means D penetrate from the radially outer side are formed.

  As shown in FIGS. 3 and 4, the partition plate valve 8 has a width slightly larger than the outer diameters of the branch pipe portion 2 and the connecting pipe 3, and the tip edge 8 a is formed in a semicircular shape. A thin plate-like valve plate (A thickness is 3.2 mm in this embodiment), an operation transmission shaft 8B fixed to the center position of the rear edge of the valve plate 8A, and a rear end of the operation transmission shaft 8B And an operation handle 8C which is screwed to the part.

  The semicircular tip edge 8a of the valve plate 8A is chamfered to have a V-shaped cross section with a sharp end located at the center position in the plate thickness direction.

  As shown in FIGS. 1 to 5, the sliding guide means C is configured such that a part of the semicircular tip end edge 8a of the partition plate valve 8 is formed with respect to the slit-shaped opening 12a. A valve case 15 having a storage space 14 in which most of the valve plate 8A can be stored while being slidably inserted is fixed to a connecting flange portion 15A formed at the rear end of the valve case 15. A lid body 16 that slides and guides the operation transmission shaft 8B of the partition plate valve 8 so as to be movable in the insertion / removal direction of the partition plate valve 8 is fastened and fixed by bolts 17. Further, the lid body 16 includes a partition plate valve. An O-ring 18 that seals between the outer peripheral surfaces of the eight operation transmission shafts 8B is provided.

  As shown in FIGS. 2 to 5, the gap forming means D is screwed into the male threaded portion 13 a of the separation bolt 13 at a portion facing the respective through holes 12 b on the outer peripheral surface of the tightening split ring 12 </ b> A. A threaded cylindrical body 20 having a female threaded portion 20a is fixed, and the distal end portion of each separation bolt 13 is radially outward with respect to the annular recess 25 between the adjacent connecting flange portions 2A and 3A. The taper surface 13b which pushes between the joint surfaces of both the connecting flange portions 2A and 3A within the range of the loosening operation allowance of the bolt 5A and the cap nut 5B of the first fastener 5 is formed.

  Further, as shown in FIG. 6, each of the separating bolts 13 has each bolt shaft core positioned on or near a plane passing through the plane of movement of the valve body 8 </ b> A of the partition plate valve 8. An operation engagement hole 13c is formed at the rear end portion of each separation bolt 13 and screwed with an operation tool such as a wrench from the outside of the screw cylinder body 20, and is attached to the tightening split ring 12A. Furthermore, an O-ring 21 that seals between the outer peripheral surface of each separation bolt 13 is provided on the inner peripheral surface of the screw cylinder 20.

  Further, the outer surface of the connecting flange portion 2A of the branch pipe portion 2 is provided on each of the contact surface of the head of the waterproof bolt 5A of the first fastener 5 and the contact surface of the cap nut 5B for waterproof specification. Alternatively, O-rings 22 and 23 are provided for sealing between the upstream surface of the upstream side connecting flange portion 3A of the connecting pipe 3.

  Therefore, a clearance S is formed between the connecting flange portions 2A and 3A in accordance with the loosening operation of the first fastener 5 that tightens and connects the connecting flange portion 2A of the branch pipe portion 2 and the connecting flange portion 3A of the connecting tube 3. Even if it occurs, the contact between the one connecting flange portion 3A and the head of the bolt 5A and the contact between the other connecting flange portion 2A and the cap nut 5B are maintained. The O-rings 22 and 23 located between them can suppress fluid leakage through the bolt insertion holes formed through the connecting flange portions 2A and 3A.

Next, a flow path blocking method for a fluid piping system using the in-pipe flow path blocking apparatus A configured as described above will be described.
First, a plurality of bolts 5C and 5D (refer to FIG. 18) of the normal specification of the first fastener 5 that tightens and connects the connecting flange portion 2A of the branch pipe portion 2 and the connecting flange portion 3A of the connecting tube 3; Replace with waterproof bolts 5A and cap nuts 5B in one or two sets.

  As shown in FIGS. 1 and 2, the connecting flange portion of the branch pipe portion 2 via the repair valve 6 in a state in which the annular elastic sealing material 11 of the blocking work cover B is expanded and deformed against the elastic restoring force. When the outer circumferential surface of 2A and the outer circumferential surface of the upstream connecting flange portion 3A of the connecting pipe 3 are mounted on the outer surface, the first elastic elastic material 11 is restored to the reduced diameter side by the elastic return of the annular elastic sealing material 11 to the first side. The seal portion 11a is pressed against the outer peripheral surfaces of both the connecting flange portions 2A and 3A with an elastic force smaller than the set pressure contact force, and at the same time, the second seal portion 11b of the annular elastic sealing material 11 is connected to both the connecting flange portions 2A and 3A. In a state where a part thereof enters the annular recess 25 formed between adjacent ones, the annular elastic seal material 11 is held by both the connecting flange portions 2A and 3A with an elastic force.

  Next, a pair of tightening split rings 12A of the blocking work cover B is applied to the outer peripheral surface of the annular elastic seal material 11, and the partition plate among the connecting pieces 12B fixed to both circumferential ends of each tightening split ring 12A. The connecting pieces 12B facing each other in the direction of inserting / removing the valve 8 are attracted and fixed with bolts 12C and nuts 12D, and relative to each other by the hydraulic pressure between the branch pipe portion 2 and the connecting pipe 3 due to the loosening operation of the first fastener 5. In a state in which the detachment movement is allowed, both the first seal portions 11a of the annular elastic seal material 11 are sealed and pressed to the outer peripheral surfaces of the both connecting flange portions 2A and 3A with a set pressure contact force. The two seal portions 11b are hermetically pressure-welded to the annular recess 25 between the adjacent portions of both the connecting flange portions 2A and 3A with a set pressure contact force.

  In this state where the blocking work cover B is attached to the branch pipe portion 2 and the connecting pipe 3, most of the thin plate-like valve plate 8 </ b> A of the partition plate valve 8 is the valve case 15 constituting the sliding guide means C. Only a part of the semicircular tip end edge 8 a of the partition valve 8 is slidably inserted into the slit-shaped opening 12 a of the fastening ring 12.

  In addition, each separating bolt 13 constituting the gap forming means D for expanding the space between the joint surfaces of the two connecting flange portions 2A and 3A within the range of the loosening operation allowance of the bolt 5A and the cap nut 5B of the first fastener 5 is The taper surface 13b only faces the annular recess 25 between the two adjacent connecting flange portions 2A and 3A, and most of the remaining portion is in the screw cylinder 20 fixed to the outer peripheral surface of the tightening split ring 12A. Is retained.

  Next, the bolt 5A and the cap nut 5B of the first fastener 5 are loosened by a dimension corresponding to the set gap S, and the thin plate-like shape of the partition plate valve 8 is formed between the joint surfaces of both the connecting flange portions 2A and 3A. A gap S that allows the valve plate 8A to enter with a slight margin appears. At this time, the operation engagement hole 13c formed in the rear end portion (radially outward end portion) of each separation bolt 13 is rotated with an operation tool such as a wrench, so that both the connecting flange portions 2A and 3A The tapered surface 13b of each separation bolt 13 facing the annular recess 25 between adjacent ones is screwed and moved inward in the radial direction, and between the connecting flange portions 2A and 3A within the range of the loosening operation allowance of the first fastener 5. Force to spread.

  Therefore, even if the first fastener 5 that has tightened and connected the connecting flange portions 2A and 3A is loosened, a gap S corresponding to the loosening operation allowance is not formed between the two connecting flange portions 2A and 3A. Alternatively, even if the upstream side connecting flange portion 3A of the connecting pipe 3 is tilted with respect to the connecting flange portion 2A of the branch pipe portion 2 within the interchangeable range existing at the flange joint location, the blocking work cover B is provided at a plurality of locations in the circumferential direction. The separation bolt 13 provided forcibly pushes and spreads between the two connecting flange portions 2A and 3A within the range of the loosening operation allowance of the first fastener 5 so that the loosening operation is performed between the two connecting flange portions 2A and 3A. Since the set gap S corresponding to the cost can be reliably formed and the opening width in the circumferential direction of the set gap S can be equalized, the blocking attached to the branch pipe portion 2 and the connecting pipe 3 Work cover Although the outer periphery of both connection flange parts 2A and 3A is enclosed by B in a sealed state, the thin plate-like valve plate 8A of the partition valve 8 provided on the shut-off work cover B is joined to the connection surface of both connection flange parts 2A and 3A. The insertion operation can be performed reliably and smoothly through the set gap S to the flow path blocking position.

  Then, as shown in FIG. 10, when the thin plate-like valve plate 8A of the partition plate valve 8 is inserted to the flow path blocking position through the set gap S between the joint surfaces of both the connecting flange portions 2A and 3A, the branch pipe portion 2 Between the connecting flange portion 2A and the upstream connecting flange portion 3A of the connecting pipe 3, the pipe flow path W in the direction of the branch axis X2 perpendicular to the pipe axis X1 of the water pipe 1 is blocked.

  Next, the sheet packing 4, which is an example of a sealing material interposed between the joint surfaces of the connecting flange portion 2 </ b> A of the branch pipe portion 2 and the upstream side connecting flange portion 3 </ b> A of the connecting pipe 3, is a thin plate of the partition plate valve 8. When the valve plate 8A is not damaged or deteriorated by the operation of inserting the valve plate 8A into the flow path blocking position, as shown in FIG. The bolts 7A and nuts 7B of the second fastener 7 that fasten and connect the side connection flange portion 3B and the upstream side connection flange portion 6A of the repair valve 6 are removed and replaced with a new repair valve 6.

  When the replacement of the new repair valve 6 is finished, the thin plate-like valve plate 8A of the partition plate valve 8 at the flow passage shut-off position is pulled out to the flow passage open position, and provided at a plurality of locations in the circumferential direction of the shut-off work cover B. After loosening the separated bolt 13 to the clearance release position, the bolt 5A and the cap nut 5B of the first fastener 5 are tightened to connect the connecting flange portion 2A of the branch pipe portion 2 and the upstream of the connecting pipe 3 The side connection flange portion 3A is tightened and connected in a sealed state. Then, after removing the blocking work cover B from the branch pipe portion 2 and the connecting pipe 3, the waterproof bolt 5A and the cap nut 5B of the first fastener 5 are connected to the normal specification bolt 5C in one or two sets. Replace with 5D.

  Further, the sheet packing 4 as an example of a sealing material interposed between the joint surfaces of the connecting flange portion 2A of the branch pipe portion 2 and the upstream side connecting flange portion 3A of the connecting pipe 3 is a thin plate shape of the partition plate valve 8. If the valve plate 8A is damaged or deteriorated due to the operation of inserting the valve plate 8A into the flow path blocking position, and it is necessary to replace it with a new seat packing 4, the repair valve 6 is removed and the work on / off valve 52 is attached. In addition, a flow path blocking device E that blocks the flow path W in the branch pipe section 2 as the upstream pipe section through the flow path W in the connection pipe 3 as the downstream pipe section is attached to the on-off valve 52 for work. A method of replacing the seat packing 4 and the repair valve 6 is adopted.

  As shown in FIGS. 12 to 17, the flow path blocking device E used in this method includes a connection flange portion 54 </ b> A that can be connected in a sealed state to the downstream connection flange portion 52 </ b> B of the work on / off valve 52. A cylindrical first operating shaft 55 is formed in the bottom wall portion 54B of the bottomed cylindrical lid body 54 so as to slidably pass through the central portion of the bottom wall portion 54B in the axial direction in a sealed state. A second operating shaft 56 that slidably passes through the first operating shaft 55 in the axial direction is provided, and the inner ends of the first operating shaft 55 and the second operating shaft 56 are provided in the branch pipe section 2. Is capable of engaging with a closing means F for blocking the flow path W and a large-diameter pipe wall portion upstream of the shielding portion by the closing means F, that is, the periphery of the branch flow path opening of the water pipe 1 When a retaining means G having a pair of locking links 57 and 58 projecting while bending in an expanded posture is provided. , The operating means H is provided for operating through both operating shaft 55, 56 a closing means F and the retaining means G from the outside.

Next, the closing means F will be described.
As shown in FIG. 16, the first pressing plate 60 having an annular pressing surface 60 </ b> A and a hollow portion 60 </ b> B opening concentrically toward the tip side is fitted on the inner end portion of the first operating shaft 55. Fixed to the inner end side of the second operating shaft 56, the annular pressing surface 61A opposite to the pressing surface 60A of the first pressing plate 60 in the axial direction and the hollow portion 60B of the first pressing plate 60. The second pressing plate 61 having a cylindrical portion 61B that is slidably fitted in the axial direction is externally slidably fitted in the axial direction, and the second pressing force is applied to the second operating shaft 56. A stopper nut 62 and a lock nut 63 for setting the maximum moving position of the plate 61 to the upstream side are screwed into a screw shaft portion 56 a formed on the inner end side of the second operation shaft 56.

  The outer diameter of the first pressing plate 60 and the outer diameter of the second pressing plate 61 are taken in and out of the branch pipe portion 2 of the water pipe 1 from the storage chamber 54C in the lid 54 through the work on-off valve 52 and the connecting pipe 3. The inner diameter of the branch pipe portion 2 and the connecting pipe 3 and the outer diameter smaller than the inner diameter of the flow path 52D in the ball valve body 52C of the work on-off valve 52 are formed so that they can be operated.

  Further, the cylindrical portion 61B of the second pressing plate 61 is formed to have an outer diameter smaller than the inner diameter of the flow path 52D in the ball valve body 52C of the work on-off valve 52 in a non-pressurized state (natural state). In addition, due to the pinching force in the axial direction by the pressing surfaces 60A and 61A of the pressing plates 60 and 61, the inner peripheral wall surface and the inner peripheral wall surface are both elastically deformed into a diameter-expanded state in close contact with the inner peripheral wall surface of the branch pipe portion 2. An elastic body 59 for expanding the diameter of rubber that shields between the outer peripheral portions of the pressing plates 60 and 61 is covered.

  As shown in FIGS. 12 to 14, the central part in the axial direction of the diameter-enlarging elastic body 59 is configured to have a larger diameter than both ends in the axial direction, and the outer peripheral surface of the large-diameter central part is The central position in the axial direction is formed on a partially spherical surface that protrudes outward most.

  Further, as shown in FIG. 16, each of the outer peripheral side end surface portion of the pressing surface 60 </ b> A of the first pressing plate 60 and the outer peripheral side end surface portion of the pressing surface 61 </ b> A of the second pressing plate 61 Formed on the annular inclined pressing surface located closer to the center position in the axial direction of the diameter-enlarging elastic body 59 toward the outer side in the radial direction so as to come into close contact with the outer peripheral annular inclined surface 59a on both end surfaces from the axial direction. In addition, the outer peripheral edge of the pressing surface 60A of the first pressing plate 60 and the outer peripheral edge of the pressing surface 61A of the second pressing plate 61 are in contact with the outer peripheral surfaces of both ends in the axial direction of the elastic body 59 for diameter expansion. The annular pressing portions 60C and 61C that are externally fitted in the state are formed.

Next, the retaining means G will be described.
As shown in FIG. 16, plate-like connecting portions 65, in which the end portions of the downstream side locking links 58 are pivotally connected at three locations in the circumferential direction of the upstream side end surface of the second pressing plate 61, are swingably supported. At the three circumferential positions of the outer peripheral surface of the mounting cylinder 66 that is fixedly attached and slidably fitted to the inner end side screw shaft portion 56 a of the second operation shaft 56, there are upstream locking links 57. A plate-like connecting portion 67 whose end is pivotally connected so as to be swingable is fixed, and a stopper nut for setting the maximum moving position of the mounting cylinder 66 upstream of the second operating shaft 56 is fixed. 68 is screwed to the tip end side of the inner end side screw shaft portion 56 a of the second operation shaft 56.

  And among the connection part 65 of the 2nd press board 61, and the connection part 67 of the attachment cylinder 66, it is respectively set to 3 sets of connection parts 65 and 67 which mutually oppose in an axial direction, and 57 links | As shown in FIG. 16, in conjunction with the sliding of the second operation shaft 56 to the outer end side, as shown in FIG. As shown in FIGS. 12 and 13, the inner peripheral wall surface on the upstream side, that is, the outer peripheral wall of the water pipe 1, is configured to be bent while being bent so as to be able to engage with the periphery of the branch channel opening. In addition, when the pair of locking links 57 and 58 of the retaining means J are extended to the reduced diameter posture, the outer waist folded posture in which the bent pivot P2 of the locking links 57 and 58 pair protrudes radially outward, that is, The bending pivot connection point P2 of the pair of locking links 57 and 58 is connected to the mounting cylinder 66. Inversion prevention means J for restricting contact with an outer waist folded posture that protrudes radially outward from a line segment connecting a pivot connection point P1 with respect to 67 and a pivot connection point P3 with respect to the coupling portion 65 of the second pressing plate 61. Is provided.

  As shown in FIG. 16, the inversion preventing means J is arranged at the downstream end of the mounting cylinder 66 against the sides of the three upstream locking links 57 extending and swinging radially inward. In contact with each other, a ring-shaped elastic corrector 71 is mounted to receive each upstream side locking link 57 in a setting limit outer waist folded position closest to the line segment.

Next, the operation means H will be described.
As shown in FIGS. 12 to 15, the first operation shaft 55 includes a long operation main body cylinder shaft 55 </ b> A that is fitted and fixed to the first pressing plate 60 from the axial direction, and the operation main body cylinder shaft. The operation extension cylinder shaft 55B is fitted and fixed to the outer end side of 55A. The inner peripheral surface of the operation extension cylinder shaft 55B is formed as a regular hexagonal different diameter inner peripheral surface.

  The second operation shaft 56 includes a long operation body shaft 56A having an inner end side screw shaft portion 56a and an operation extension shaft 56B screwed and fixed to the outer end side of the operation body shaft 56A. The operation extension shaft 56B includes an outer end side screw shaft portion 56b in which an operation screw member 76 that can be brought into contact with the end portion of the operation extension cylinder shaft 55B of the first operation shaft 55 via a thrust bearing 75 is screwed. A large-diameter angular shaft portion 56c having a regular hexagonal outer peripheral surface that is slidably fitted only in the axial direction in a state in which the first operation shaft 55 is not rotatable relative to the operation extension cylinder shaft 55B is formed. Yes.

  Then, when the operation screw member 76 is screwed to the tightening side, the first operation shaft 55 is pushed and slid to the inner end side with respect to the second operation shaft 56 as shown in FIG. Due to the clamping action accompanying the proximity movement of the first pressing plate 60 with respect to 61, the elastic body 59 for diameter expansion in an uncompressed state is elastically deformed into a diameter expansion state in close contact with the inner peripheral wall surface of the branch pipe portion 2, The flow path W in the branch pipe part 2 is shielded in a sealed state.

  In addition, a pair of first presser operation rods 77 are detachably fitted and held on the operation extension cylinder shaft 55B of the first operation shaft 55, and the first presser operation rods 77 include a second The second presser foot 78 that is detachably fitted to and held by the operation extension shaft 56B of the operation shaft 56 can be freely engaged and disengaged, and in the engaged state, the second operation with respect to the first operation shaft 55 against water pressure. The first locking ring 79 that prevents the shaft 56 from sliding toward the outer end side and the pair of L-shaped locking pieces 80 fixed to the bottom wall portion 54B of the lid body 54 can be freely engaged and disengaged. In the engaged state, a second locking ring 81 is provided that prevents sliding of the first operating shaft 55 to the outer end side with respect to the lid 54 against water pressure.

Next, a method for replacing the seat packing 4 and the repair valve 6 using the flow path blocking device E configured as described above will be described.
[1] As shown in FIG. 11, the bolt 7A of the second fastener 7 that fastens and connects the downstream connection flange portion 3A of the connection pipe 3 and the upstream connection flange portion 6A of the repair valve 6 to be replaced. After loosening the nut 7B and removing the repair valve 6 to be replaced, the upstream connecting flange portion 52A of the work on-off valve 52 is connected to the downstream connecting flange portion 3A of the connecting pipe 3 with the second fastener 7 The bolts 7A and nuts 7B are tightened and connected.

  [2] As shown in FIG. 12, the ball valve body 52C of the working on-off valve 52 is closed, and the thin plate-like valve plate 8A of the partition plate valve 8 at the flow path blocking position is pulled out to the flow path opening position. After that, the connection flange portion 54A of the lid 54 of the flow path shutoff device E is fastened and connected to the downstream connection flange portion 52B of the work on-off valve 52 with the bolt 7A and the nut 7B of the second fastener 7.

  At this time, with the pair of first locking rings 79 engaged with the second presser operating rod 78, the pair of second locking rings 81 is removed from both the locking pieces 80 of the lid 54, and both the operation shafts 55 are removed. , 56 are moved upward with respect to the lid 54, and the closing means F and the retaining means G are stored in the storage chamber 54C of the lid 54.

  Further, the positional relationship between the operation shafts 55 and 56 in the axial direction is regulated by the first locking rings 79, and in this state, the opposing distance between the pressing plates 60 and 61 is the diameter-enlarging elastic body 59. Is not compressed or set at an interval close thereto, the diameter-enlarging elastic body 59 is maintained in a reduced diameter state.

[3] As shown in FIG. 13, the operation on-off valve 52 is opened, both the operating shafts 55 and 56 are pushed and moved downward with respect to the lid 54, and the pair of second locking rings 81 are covered. Engaging with both locking pieces 80 of the body 54, the two operating shafts 55 and 56 are pushed in and held in the operating position.
At this time, the retaining means G is located in the water pipe 1 having a larger cross-sectional area than the flow path W in the branch pipe portion 2.

  [4] Next, as shown in FIG. 14, the pair of first locking rings 79 are removed from the second presser operation lever 78, and the second presser operation rod 78 is moved from the operation extension shaft 56 </ b> B of the second operation shaft 56. When removed, the second operation shaft 56 is moved to the outer end side (upper side in the figure) with respect to the first operation shaft 55 by the water pressure of the tap water flowing through the water pipe 1 or the water pressure and the artificial pulling operation force. The pair of locking links 57 and 58 which are pivotally connected across the connecting portion 65 of the second pressing plate 61 and the connecting portion 67 of the mounting cylinder 66 are bent in a diameter-enlarging posture in conjunction with the sliding. Overhang.

  In this state, as shown in FIG. 15, both the second locking rings 81 are removed from both locking pieces 80 of the lid 54, and both operations are performed by the tap water pressure or the water pressure and an artificial pulling operation force. When the shafts 55 and 56 are slid upward with respect to the lid 54, the pair of locking links 57 and 58 bent in the diameter-enlarging posture are located on the upstream side of the flow path shielding portion by the diameter-enlarging elastic body 59. The peripheral wall surface, that is, the branch channel opening periphery of the water pipe 1 is engaged.

  [5] As shown in FIGS. 15 and 16, when the operation screw member 76 is artificially screwed to the tightening side, the first operation shaft 55 is moved to the inner end side (downward in the figure) with respect to the second operation shaft 56. The elastic body 59 for expanding the diameter in the reduced diameter state is formed on the inner peripheral wall surface of the branch pipe portion 2 by the pressing action accompanying the proximity movement of the first pressing plate 60 with respect to the second pressing plate 61. It is elastically deformed into an expanded diameter state in close contact, and the space between the inner peripheral wall surface of the branch pipe portion 2 and the outer peripheral portions of the pressing plates 60 and 61 is shielded in a sealed state.

  [6] Next, as shown in FIGS. 15 and 17, the opening / closing operation lever 83A of the faucet 83 connected to the drain pipe 82 of the lid 54 is opened to discharge water, and the water stoppage is stopped by stopping the water discharge. After confirming the above, after removing the first presser operating lever 77 and the lid 54, the work on-off valve 52 and the connecting pipe 3 are removed from the branch pipe portion 2 of the water pipe 1.

  Thereafter, as shown in FIG. 18, a plurality of sets of upstream connecting flange portions 3A of the connecting pipe 3 are connected to the connecting flange portions 2A of the branch pipe portion 2 with a new sheet packing 4 interposed between their joint surfaces. After being tightened and detachably connected in a sealed state with a first fastener 5 comprising normal bolts 5C and 5D, an upstream connection flange of a new repair valve 6 is connected to a downstream connection flange portion 3B of the connection pipe 3 The part 6A is detachably tightened and connected in a sealed state with a second fastener 7 including a plurality of sets of bolts 7A and nuts 7B with a new sheet packing 4 interposed between the joint surfaces.

[Other Embodiments]
(1) In the first embodiment described above, the fluid piping system in which the branch pipe portion 2 is integrally formed in the middle of the fluid pipe 1 such as a water pipe has been described, but the fluid pipe 1 is provided along the circumferential direction thereof. And a branch pipe portion 2 that protrudes from the pipe radial direction with respect to a through-hole formed in the fluid pipe 1 in one split joint body. The technique of the present invention may be applied to a fluid piping system in which an existing pipe joint is mounted and an on-off valve is attached to a branch pipe portion of the pipe joint.

(2) In the first embodiment described above, the elastic sealing material 11 of the blocking work cover B is integrally formed in an annular shape, but the elastic sealing material 11 may be divided into a plurality in the circumferential direction.
In short, any blocking work cover B may be used as long as it can be detachably attached to both pipe portions 2 and 3 in a state in which the outer periphery of both connection flange portions 2A and 3A is sealed.

(3) In the first embodiment described above, the gap forming means D moves from the radially outer side into the gap S between the two connecting flange portions 2A, 3A at a plurality of locations in the circumferential direction of the blocking work cover B. However, the present invention is not limited to this configuration. For example, a plurality of wedge members that are urged inward in the radial direction may be provided. Good.
In short, as the gap forming means D, any structure can be used as long as the gap between the joint surfaces of the two connecting flange portions 2A and 3A can be forcibly expanded within the range of the loosening operation allowance of the first fastener 5. May be adopted.

(4) In the first embodiment described above, the partition plate valve 8 includes a thin plate-like valve plate 8A having a width slightly larger than the outer diameters of the branch pipe portion 2 and the connecting pipe 3, and the valve plate 8A. The operation transmission shaft 8B fixed to the rear end edge and the operation handle 8C screwed and fixed to the rear end portion of the operation transmission shaft 8B are configured. You may comprise only the thin plate-shaped valve plate 8A which has a width a little larger than the outer diameter of the pipe | tube 3. As shown in FIG.
In short, the partition valve 8 is a thin plate that can be inserted and moved to a position where the pipe flow path W is blocked through the gap S between the two connecting flange portions 2A and 3A generated by the loosening operation of the first fastener 5. Any shape may be used as long as it is.

  (5) The sliding guide means C may be of any structure as long as the partition plate valve 8 can be slidably guided across the flow path blocking position and the flow path opening position in a sealed state. It may be used.

The side view when the flow path blocking method of the fluid piping system of the present invention is shown and the in-pipe flow path blocking device is mounted Partial cutaway side view when the pipe flow path blocking device is installed Horizontal sectional view when the pipe flow path shut-off device is installed Expanded cross-sectional side view of the pipe flow path blocking device Enlarged sectional view of the main part showing the relationship between both connecting flanges and the annular elastic sealing material Enlarged sectional view of the main part showing the relationship between the gate valve body and the separation bolt Perspective view of annular elastic sealing material Cross section of annular elastic sealing material Front view of annular elastic sealing material Partially cutaway side view when the gate valve is inserted into the flow path blocking position Partially cutaway side view when replacing the repair valve with a work on / off valve Partially cutaway side view when the flow shut-off device is attached to the work on / off valve Partially cutaway side view when the closing means and the retaining means are lowered to the water pipe side Partially cutaway side view when the link pair of retaining means is bent to an expanded posture Partially cutaway side view when the flow path is blocked by an elastic body for diameter expansion Enlarged cross-sectional view of the main part when the flow path is blocked by the elastic body Partially cutaway side view of the work clamp, after removing the first presser foot and the lid, and removing the work on-off valve and connecting pipe from the branch pipe of the water pipe Side view when replaced with new seat packing and new repair valve Sectional front view of the main part showing a conventional flow path blocking method Cross-sectional plan view of the main part

Explanation of symbols

B Blocking work cover C Sliding guide means D Gap forming means S Gap W In-pipe flow path 2 Branch pipe part (upstream pipe part)
2A Connecting flange part 3 Connecting pipe (downstream pipe part)
3A Connecting flange (upstream connecting flange)
4 Sealing material (sheet packing)
5 fasteners (first fasteners)
5A Bolt 5B Cap nut 8 Partition valve 11 Annular elastic seal material 11a First seal portion 11b Second seal portion 11c Opening 12 Fastening ring 13 Separation bolt 22 O-ring 23 O-ring

Claims (1)

  Blocking that can be installed in a state where the outer periphery of both connecting flange portions is sealed against both pipe portions that are tightened and connected by a fastener with a sealing material interposed between the joint surfaces of both connecting flange portions. A thin partition valve that can be inserted into the work cover through the gap between the connecting flanges generated by the loosening operation of the fastener to the position where the flow path in the pipe is blocked, and the partition valve can be moved in a sealed state. Sliding guide means is provided for sliding and guiding between the path blocking position and the channel opening position, and the blocking work cover is an annular shape that can be pressed against the outer peripheral surface of each connecting flange portion from the outside in the radial direction. An annular ring that can be press-contacted from the outside in the radial direction in a state where a part of the first seal portion and the annular recess formed in the radially outward direction is adjacent between the outer peripheral surfaces of the first and second connecting flange portions. Ring with second seal An elastic sealing member, the annular elastic sealing material is clamped radially from outside bisected by that pipe flow path blocking device is composed of a fastening ring of the structure.

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