JP4425149B2 - Unit for replacing valve part of existing water pipe - Google Patents

Description

  The present invention includes firefighting water pipes, indoor / outdoor fire hydrant equipment, sprinkler equipment, water spray fire extinguishing equipment, firefighting water distribution pipes such as fired water sprinkling equipment, piping sections of various water tanks such as elevated water tanks and water receiving tanks, etc. It is related with the valve | bulb part replacement | exchange unit used for replacement | exchange at the time of malfunctioning in valve bodies, such as a non-return valve interposed in this water distribution pipe.

  In general, as shown in FIG. 1, for example, as shown in FIG. 1, the fire-fighting connected water pipe corresponds to each floor or room from a main pipe 10 that connects a water inlet 11 provided on the ground and an auxiliary water tank 12 installed on a building rooftop or the like. The branch pipes 14 connected to the plurality of water outlets 13 are branched, and when a fire breaks out, before the start of full-scale water supply from the water outlet 11 by a fire tank car or a fire hydrant connection due to water discharge from the auxiliary water tank 12 The fire water can be extinguished using the stored water in the auxiliary water tank 12. The upper horizontal pipe portion 10a connected to the auxiliary water tank 12 in the main pipe 10 is provided with a check valve 2 adjacent to the downstream side of the gate valve 1, and further has a test water outlet 15 for checking the water discharge capacity. It is installed downstream.

  In addition, the lower horizontal pipe portion 10b connected to the water supply port 11 of the main pipe 10 is provided with a gate valve 1 'and a check valve 2' similar to those on the upper side, and drains to the water supply port 11 side from these. A valve 16 is provided. Moreover, the level switch 17 is provided in the auxiliary water tank 12, and when the water surface becomes either higher or lower than the set range, for example, an alarm device 18 installed in the management room of the apartment is activated. Reference numeral 19 denotes an elevated water tank for supplying water to the auxiliary water tank 12, but there is also a specification for supplying water to the auxiliary water tank 12 directly from the water pipe.

  By the way, in connection with "revision of firefighting equipment inspection standards" (firefighting law Article 17-3-3) enforced on July 1, 2002, about progress for connection water pipe which passed ten years after construction It is obliged to conduct a pressure test and report the results to the fire department every three years thereafter. In this pressure test, as shown in FIG. 1, the hose H of the power firefighting pump car PC with water tank is connected to the water supply port 11, the water discharge port 13 is closed, and the gate valve 1 on the auxiliary water tank 12 side is opened (note that In use, the above-mentioned open state is open), and the test water outlet 15 with a pressure gauge is opened, the gate valve 1 'on the water supply port 11 side is opened, water is supplied from the pump car PC, and piping is used as a water check. Fill the whole with water and check for abnormalities such as water leakage. If there is no abnormality, close the test outlet 15 as a pressure check and apply pressure to the piping system so that the pressure gauge becomes 100 megapascals, for example. If the pressure gauge does not fluctuate during this 3 minutes, it is normal, but if the pointer of the pressure gauge gradually moves in the pressure reducing direction, it is judged that water has leaked and the water leakage location is investigated and repaired. Maintain and re-flow water and check pressure There, judges pass, leakage point is rejected if it is irreparable without leakage. In addition, depending on the equipment status of the connected water pipe, airtight inspection may be performed by sending air into the pipe before the water filling inspection.

  As a result of such a pressure test, in addition to water leakage in the piping itself, a failure of the check valve 2 on the auxiliary water tank 12 side is often found and needs to be replaced. That is, as shown in FIG. 14, the check valve 2 generally used for a connected water pipe has a disc-like valve body 21 pivotally supported on a horizontal support shaft 20 so as to be swingable. The valve element 21 is normally in close contact with the annular valve seat 22 along the inclined surface as shown in the drawing due to its own weight, and the valve hole 23 is blocked by the water pressure from the water inlet 2a on the left side of the drawing. On the other hand, the valve seat 22 is strongly pressed against the valve seat 22 by the water pressure from the water inlet 2b on the right side of the figure, but the valve is closed due to internal corrosion, deposits, etc. while it is left for a long time. The valve body 21 and the valve seat 22 at the time of valve may become poor adhesion, or the swingability of the valve body 21 may deteriorate. In addition, the presence or absence of this malfunction can be easily determined by whether or not a pressure difference due to opening and closing of the gate valve 1 occurs in the pressure resistance test.

  If there is a problem with the check valve 2, after using the water stored in the elevated water tank 12 in the event of a fire, when water supply from the water supply port 11 by the fire-fighting pump car PC or the like starts with the gate valve 1 open, Due to the blockage failure at the check valve 2, part of the water supply flows back into the elevated water tank 12, and the fire discharge operation becomes difficult due to the decrease in the water discharge pressure. Therefore, it is essential to replace the check valve 2 that has failed with a new one.

  However, as shown in FIG. 13, the gate valve 1 and the check valve 2 are connected to the water passages 1 a, 1 b, 2 a, 2 b with female threads (not shown in the figure). 14 are shown in FIG. 14 as reference numerals 24a and 24b), and are screwed and connected in close proximity via both screw short pipes 3 provided with male screws 3a and 3b of opposite threads at both ends as shown in FIG. In many cases, the connected both ends are screwed and connected to the end portion of the horizontal pipe portion 10a provided with the male screw through the same double screw short pipes 3 and 3. 3 and the horizontal pipe portion 10a are screwed together by rust or the like within a long period of time and are difficult to remove, and the entire piping including the connecting portions of these valves 1 and 2 is usually indicated by an imaginary line. In this way, it is covered with a thick heat insulating material 4 made of a foamed synthetic resin molding, and the surface of the heat insulating material 4 is made of stainless steel. Is covered with a protective cover 5 of the additional level, since only handle 1c of the gate valve 1 is in a state of being exposed to the outside, it is difficult to know the exact engagement position of both sides of both screws short pipe 3,3.

  For this reason, conventionally, when replacing the check valve 2 which has caused a problem, for example, as shown by cutting lines C and C indicated by a one-dot chain line in FIG. After cutting the horizontal tube portion 10a together with the heat insulating material layer 4 and the metal protective cover 5 at rough positions on both sides including the whole, the raw material prepared as a substitute for the both screw short tubes 3 and 3 on both sides is prepared. The tube is cut to a suitable length, and external threads are formed on the outer periphery of each end to form a connecting tube, and female threads are also formed on the inner periphery of both ends of the cut horizontal tube 10a. The new check valve 2 and the gate valve 1 are connected to each other through the double screw short pipe 3, and both sides thereof are screwed and connected to the ends of the horizontal pipe parts 10a on both sides through the connecting pipe body. Further, the replacement part is encapsulated with a heat insulating material 4 and a protective cover 5.

  As described above, when a check valve on the downstream side of the elevated water tank in the firefighting water pipe is replaced due to a problem, conventionally, the pipe on the pipe side that has been cut off with the male thread at each end of the connection pipe body to be newly used is used. The internal thread at both ends is formed by tapping on-site, and the length of the heat insulating material and protective cover that encloses the replacement part must be adjusted on-site, so a great deal of labor and time is spent on the replacement work. In addition, the distance between both ends of the pipe cut when the connecting pipe is screwed in is widened by screwing allowances on both sides, and therefore, a complicated operation such as removing and attaching the pipe mounting portion over a wide range is required. was there. In addition, in the past, the above inspection and pressure test, repair and replacement of piping and valves, and installation of insulation and protective covers are usually performed individually by specialists. In addition to the time required, repair costs were high.

  Note that such a problem is not limited to the case where the check valve and the gate valve are arranged close to each other as shown in the figure, and the check valve in which the check valve is located at a position away from the gate valve causes a problem. Of course, when only the stop valve is replaced by cutting the pipes on both sides, the same applies to the replacement of various valve bodies other than the check valve. Furthermore, it becomes a common problem when exchanging valves in various existing water distribution pipes, such as piping parts of various aquariums such as elevated water tanks and water tanks including those for non-firefighting.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide means for performing replacement work very easily and quickly when a problem occurs in a valve portion of an existing water distribution pipe.

Pair in order to achieve the above object, the invention according to claim 1, which closed if Shimese subjected to the drawing reference numerals, both sides through Mizuguchi 1a, 1b, 2a, husband 2b s female thread 24a, 24b, 24a, and 24b a replacement valve body (gate valve 1 and the check valve 2), the through water inlet 1b is interposed between both the replacement valve body 1, 2, 2a of the female screw 24a, male screw 3a screwed to 24b, 3b And a pair of connecting screws provided with male screws 6a and 6a which are screwed into the female screws 24a and 24b of the water flow ports 1a and 2b of the replacement valve bodies 1 and 2 only on one end side. A pair of pipe couplers 7 and 7 in which an annular rubber sleeve 71 is disposed inside an open annular casing 70 made of a strip-shaped metal plate having fastening bolts 72 and 72 attached between both ends thereof, and the respective members. overall connection of 1,2,3,6,7 and each member A halved heat insulating material 8 made of a foamed synthetic resin molding to be encapsulated, and a fixing means (buckle 90) for fixing the heat insulating material 8 in an encapsulated state, the replacement valve element (gate valve 1, The pipe coupler is connected to a butt portion between the other end side of each connecting pipe body 6 screwed to the check valve 2) and a cut end portion obtained by cutting and removing the old valve portion of the existing water pipe (horizontal pipe portion 10a). The replacement valve replaces the old valve part removed from the existing water distribution pipe (horizontal pipe part 10a) by straddling 7 and tightening the fastening bolts 72, 72 of the pipe coupler 7 to reduce the ring opening diameter. An existing arrangement in which the bodies 1 and 2 are connected in communication, and each member including the replacement valve bodies 1 and 2 is covered with the heat insulating material 8 and fixed by the fixing means (buckle 90). It is a water pipe valve replacement kit.

  The invention according to claim 2 is the valve part replacement kit according to claim 1, further comprising a halved hard protective cover 9 covering the outer periphery of the encapsulated heat insulating material 8.

According to a third aspect of the present invention, in the valve part replacement kit according to the first or second aspect, the pipe coupler 7 is provided with an inwardly-opened ring having a large number of inward teeth 73a on the inner peripheral side of both side opening edges. The grip ring 73 is disposed, and a pair of tightening bolts 72 and 72 are disposed on both sides of the open annular casing 70 in the width direction.

According to the valve part replacement kit for an existing water pipe according to the invention of claim 1, when a problem occurs in the valve body of the existing water pipe, the valve body is removed by cutting the pipes on both sides. The one end side of the connecting pipe body having a male thread only at one end side is screwed into the both-side water inlets, and the other end portion of the connecting pipe body is screwed with each end portion of the existing water distribution pipe. Because it is connected via a tightening-type pipe coupler, it is not necessary to perform on-site tapping processing on the other end of the exchange-side pipe body and the end of the existing pipe that has been cut as before. Since it is not necessary to widen the gap between the two ends of the cut pipe in the connecting operation of the parts, there is no need for complicated operations such as attaching and detaching the pipe mounting part, and the halved insulation and its fixing means are in a set because going on, the existing water pipe side when removing the valve element caused trouble insulation material The cutting position only leave in accordance with the length of the heat insulating material to be coated in a slightly longer in scope than the pair of connecting tube and the replacement valve body and both threaded short pipe and a continuous length of pipe coupler of the present kit Then, the replacement part can be encapsulated easily and quickly by fitting the halved heat insulating material from both sides in the radial direction following the connection by the pipe coupler, so that the replacement work of the valve part can be performed very easily and in a short time. Can be completed. Since the annular rubber sleeve is arranged on the inner periphery of the pipe coupler, the connecting portion is surely watertightly sealed when the rubber material is in close contact with the surface of the pipe body.
Further, according to the present invention, in the existing water distribution pipe in which the check valve and the gate valve are connected via the double screw short pipe, when the check valve has a problem, the check valve and the gate valve are interposed. Cut the pipe on both sides of the part to remove the entire intervening part, and connect the pipe coupler to the removed part with a check valve and a sluice valve for replacement connected through a short screw pipe. Can be easily connected.

  According to the valve portion replacement kit of the second aspect of the present invention, it is possible to easily attach the hard protective cover that covers the outer periphery of the valve replacement portion after the encapsulation by the heat insulating material.

According to a third aspect of the present invention, the pipe coupler is disposed on both inner sides of the open annular casing while the open annular grip ring having a large number of inward teeth is disposed on the inner peripheral side of the opening edges on both sides. Since it has a pair of tightening bolts, a strong tightening force due to the tightening bolts acts on each of the pipes to be connected, and the inward teeth of each open annular grip ring bite into the outer peripheral surface of each pipe. Exhibits a strong retaining action.

  Hereinafter, an embodiment of a valve part replacement kit for an existing water distribution pipe according to the present invention will be specifically described with reference to the drawings. In the valve part replacement kit of this embodiment, the existing check valve 2 in which a defect is found is replaced with a new one together with the adjacent gate valve 1 by the pressure resistance test for the fire-fighting connecting water pipe shown in FIG. It is used for

FIG. 2 shows a state in which the valve part replacement kit of the present embodiment is attached to the horizontal pipe part 10a in the existing connected water pipe for fire fighting. This valve part replacement kit includes a gate valve 1, a check valve 2, a double screw short pipe 3 for connecting both valves 1 and 2, two connecting pipes 6, 6, two pipe couplers 7, 7. A halved heat insulating material 8 made of a foamed synthetic resin molding and a halved hard protective cover 9 hinged. Then, gate valve 1 and the check valve 2 and the two screws short pipe 3, both Ri new der, each either side of the passing Mizuguchi 1a gate valve 1 and the check valve 2, 1b, 2a, 2b into the internal thread 24a, 24b, 24a, and 24b are formed, but have the same size and shape as the gate valve 1, the check valve 2, and the double threaded short pipe 3 in the existing portions shown in FIGS. The gate valve 1 is not shown inside, but the shielding plate in the plane direction perpendicular to the flow path direction is moved up and down by the rotation operation of the handle 1c, and the flow path is blocked at the lower limit position. It has become.

As shown in FIG. 4, each connecting tube 6 is provided with a male screw 6a only on the outer periphery on one end side. Thus, the male threads 6a and 6a of the two connecting pipe bodies 6 and 6 are reverse threads, and one connecting pipe body 6 is connected to the female thread 24a of the water passage 1a of the gate valve 1 and the other connecting pipe. The body 6 is connected to the female screw 24b of the water passage 2b of the check valve 2 by screwing the male screw 6a. Further, the gate valve 1 and the check valve 2 are connected by a double screw short pipe 3 in which male screws 3a and 3b at both ends are screwed to female screws 24a and 24b of the water flow ports 1b and 2a.

  As shown in FIGS. 3, 5, and 6, the pipe coupler 7 is held by an outer annular side open casing 70, an inner peripheral side annular rubber sleeve 71, and a folded end portion 70 a of the open annular casing 70. A rod-shaped washer 74, a rod-shaped nut 75 held by the other end portion 70b, a pair of tightening bolts 72, 72 passing through the rod-shaped washer 74 and screwed into the rod-shaped nut 75, an open annular casing 70 and an annular shape An open annular slide plate 76 disposed between the rubber sleeve 71, open annular grip rings 73 and 73 disposed on the inner peripheral side of both side openings, and an inclined side edge portion 76 a projecting obliquely inward of the open annular slide plate 76. , 76a and the inner periphery of the open annular casing 70, the triangular rings 77, 77 having a triangular cross section and the side edges 70c, 70 projecting inwardly of the open annular casing 70. Snap rings 78, 78 disposed between each of the open annular grip rings 73 and annular coil springs 79, 79 disposed in a pair of left and right cavities 71a that enter from the inner peripheral side of the annular rubber sleeve 71. Has been. Each member except the annular rubber sleeve 71 is made of a metal such as stainless steel.

  Thus, each open annular grip ring 73 is provided with a large number of inward teeth 73a at regular intervals by sandwiching the outer peripheral edge located at the corner of the open annular casing 70 between the triangular ring 77 and the snap ring 78. Further, the inner peripheral edge side is disposed in an inclined state in which the inner peripheral edge side is inclined inward. Further, the open annular slide plate 76 is disposed so as to block the open portion of the open annular casing 70, and the other open annular members 73, 77, 77 are also disposed so that the open portions are displaced from each other in the circumferential direction. ing. Both end portions 70a and 70b of the open annular casing 70 are welded to the main body side at the folded ends, and openings 70d... For inserting the fastening bolts 72 are formed on both sides in the width direction.

  As shown in FIG. 11, the heat insulating material 8 is composed of a pair of halves 8A and 8B that are symmetrical with the halved plane being vertical. Each of these halves 8A and 8B is made of a hard foamed synthetic resin molded product such as foamed polystyrene, and has a total length exceeding the cut length for replacing the valve part in the existing horizontal pipe part 10a as shown in FIG. In addition to the gate valve 1, check valve 2, both screw short pipe 3, two connecting pipes 6, 6, and two pipe couplers 7, 7 in the connected state, a cut horizontal A semicircular ring (matching) having recesses 81 and 81 having a shape that can be brought into close contact with the entire outer periphery including both side portions of the tube portion 10a, and having both end portions 82 and 82 matching the cross-sectional shape of the existing heat insulating material 4. In an annular shape). Then, by enveloping from both sides in the radial direction by the two halves 8A and 8B of the heat insulating material 8, only the handle 1c of the gate valve 1 is set to be exposed to the outside as shown in FIGS. Yes.

  The hard protective cover 9 is made of a metal plate such as a stainless steel plate, an aluminum alloy plate, or a galvanized iron plate. As shown in FIG. 12, the inner surfaces corresponding to the outer surface shapes of the two halves 8A and 8B of the heat insulating material 8 are used. A pair of frame-shaped halves 9a, 9b having a shape are pivotally connected via a hinge 9c at the lower end, and a lever metal fitting 90a on the upper surface on the half body 9a side and an upper surface on the half body 9b side. The halves 9a and 9b can be fixed in a joined state by fastening a buckle 90 comprising a hook metal fitting 90b. Thus, both end portions 91 and 91 of the hard protective cover 9 form a semicircular arc shape corresponding to both end portions 82 and 82 on the heat insulating material 8 side, but are slightly longer than both ends of the heat insulating material 8.

  When the valve part replacement kit having the above configuration is used, first, as shown in FIG. 7, the intervening part of the gate valve 1 adjacent to the check valve 2 in which the trouble occurs in the existing horizontal pipe part 10a is cut off on both sides. The heat insulating material 4 (FIG. 13) and the protective cover 5 (FIG. 13) are cut and removed at the positions C1 and C1, and the existing heat insulating material 4 (FIG. 13) and the protective cover 5 are further cut at the outer cutting positions C2 and C2. Only the (FIG. 13) is cut and removed to expose both side portions of the horizontal tube portion 10a. At this time, the intervals between the cutting positions C1 and C1 are slightly longer than the length in which the gate valve 1 and the check valve 2 of the valve portion replacement kit, the short screw pipe 3 and the connecting pipes 6 and 6 are connected. Set as follows. Further, the cutting positions C2 and C2 are set so that both ends thereof are substantially in contact with the cut end surface of the existing heat insulating material 4 in accordance with the length of the heat insulating material 8 of the valve portion replacement kit.

  Next, after marking M on both sides of the exposed horizontal pipe portion 10a from the cut end to a position that is approximately half the width of the pipe coupler 7 as shown in FIG. 8, as shown in FIG. Each pipe coupler 7 is externally fitted so that it does not protrude from the cut end of the horizontal pipe portion 10a, and the gate valve 1 and the check valve 2, the screw short pipe 3 and the connecting pipe bodies 6 and 6 are connected in advance. It arrange | positions between the cutting ends of the both sides of the horizontal pipe part 10a. Then, as shown in FIG. 10, the pipe couplers 7 are evenly straddled between positions where the outer ends thereof match the marking M, that is, between the pipe ends facing the connecting pipe body 6 and the horizontal pipe portion 10a. Slide to the position, and tighten the bolts 72, 72 at this position. By this tightening operation, the opening diameter of the open annular casing 70 of the pipe coupler 7 is reduced, so that the connecting pipe body 6 and the horizontal pipe portion 10a are coupled, and the annular rubber sleeve on the inner periphery of the pipe coupler 7 is connected. The connection portion is reliably liquid-tightly sealed by 71. It should be noted that excessive or insufficient tightening can be prevented by using a torque wrench for this tightening operation and setting a predetermined tightening torque.

  Thus, after connecting the new valve portion to the horizontal pipe portion 10a through the pipe couplers 7 and 7, both halves 8A and 8B of the heat insulating material 8 are fitted from both radial sides as shown in FIG. Thus, the mounting portion of the new valve portion is encapsulated by the heat insulating material 8, and the encapsulated portion is covered with a hard protective cover 9 as shown in FIG. 12, and both halves 9a and 9b are closed to buckle. By fixing at 90, the heat insulating material 8 is also fixed in the encapsulated state together with the hard protective cover 9, and the valve portion replacement is completed. And in the state which completed this valve part replacement | exchange, as shown in FIG. 2, while the both ends of the heat insulating material 8 of the valve part replacement kit are substantially in contact with the cut end surface of the existing heat insulating material 4, the hard protective cover 9 Both end portions 91 and 91 are partially fitted and overlapped with both end portions of the existing protective cover 5.

  As described above, according to this valve portion replacement kit, tapping processing on the pipe connection end portions on both sides of the existing side and the replacement side (new side) as in the prior art becomes unnecessary, and screwing is not performed in the connecting operation of the replacement portion. Since it is not necessary to widen the interval between the cut ends of the horizontal pipe portion 10a in order to secure the allowance, it is not necessary to perform complicated operations such as detachment of the pipe mounting portion regardless of the piping specifications of the horizontal pipe portion 10a. In addition, a heat insulating material 8 encapsulating the replacement part and a hard protective cover 9 covering the outer periphery of the replacement part are also provided as a set, and these can be attached very easily following the connection of the pipes, thus making the replacement of the valve part very easy. Complete in a short time. In addition, since the replacement work does not require specialized technology for piping construction or insulation material construction, when a business operator in charge of pressure resistance finds a malfunction of the valve unit, the business operator himself installs this valve unit replacement kit. It can be used to replace the valve without any trouble, thereby reducing the valve replacement cost and the construction period.

  Further, in the present embodiment, as the pipe coupler 7, an open annular grip ring 73 having a large number of inward teeth 73 a... Is arranged on the inner peripheral side of the opening edges on both sides, and on both sides in the width direction of the open annular casing 70. Since one having a pair of clamping bolts 72, 72 to be arranged is used, a single clamping bolt 72 can apply a strong clamping force to each of the connecting pipe body 6 and the horizontal pipe portion 10a to be connected. In addition, by the biting of the inward teeth 73a of the open annular grip rings 73 into the outer peripheral surface, a strong retaining action for the connecting pipe body 6 and the horizontal pipe portion 10a is exhibited.

  In the above embodiment, the buckle 91 of the hard protective cover 9 is a fixing means for fixing the heat insulating material 8 in the encapsulated state. However, a hard protective cover 9 without the buckle 91 can be used, or a hard protective cover can be used. In the configuration in which 9 is not provided, various structures such as fastening bands made of metal or synthetic resin may be used as the fixing means. Moreover, about the heat insulating material 8 and the hard protective cover 9, it is comprised, for example from the multiple pairs of halves which are different in a valve body part and a tube part, or the cylindrical shape for the half parts for both main parts and both ends. The halves of the hard protective cover 9 may be composed of independent members that are not hinged as in the embodiment.

  Furthermore, in the above embodiment, the gate valve 1 is also replaced with a new one together with the check valve 2 in which a problem has occurred. However, the gate valve 1 can be used without any trouble and easily separated from the cut pipe. It goes without saying that the gate valve 1 may be reused if possible.

  Thus, the valve part replacement kit of the present invention is used for various fire fighting equipment other than the firefighting connected water pipe exemplified in the above embodiment, such as indoor and outdoor fire hydrant equipment, sprinkler equipment, water spray fire extinguishing equipment, fire fighting connected watering equipment, etc. Of course, it can also be applied to water pipes, and can also be applied to piping parts of various water tanks including non-firefighting tanks such as elevated water tanks and water receiving tanks, and there are no particular restrictions on the type of valve body to be replaced. .

It is a schematic diagram which shows the piping structure of the connection water pipe for fire fighting which is an example of the existing water pipe which applies the valve part replacement kit of this invention. It is a vertical side view which shows the existing water pipe after valve part replacement | exchange by the valve part replacement kit which concerns on one Embodiment of this invention. It is a perspective view of the piping coupler of the valve part replacement kit. It is a half section side view of the pipe for connection of the valve part exchange kit. It is a vertical side view which shows the pipe connection part by the said pipe coupler. It is a front view of the principal part of the piping coupler. It is a vertical side view which shows the cutting position of the existing water pipe which performs valve part replacement | exchange by the valve part replacement kit. It is a vertical side view which shows the fitting operation of the piping coupler with respect to the existing water pipe after the cutting | disconnection in the valve part replacement | exchange. It is a vertical side view which shows arrangement | positioning operation of the valve body connection part for replacement | exchange after piping coupler fitting in the valve part replacement | exchange. It is a vertical side view which shows the pipe connection state by the pipe coupler in the valve part replacement | exchange. It is a vertical front view which shows fitting operation of the heat insulating material in the valve part replacement | exchange. It is a vertical front view which shows the attachment operation of the hard protective cover in the valve part replacement | exchange. It is a vertical side view which shows the existing water pipe before valve | bulb part replacement | exchange. It is a principal part fracture side view of the non-return valve interposed in the existing water distribution pipe. It is a half cross-sectional side view of the double screw short pipe interposed by the existing water distribution pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gate valve 1a, 1b Water flow port 2 Check valve 2a, 2b Water flow port 3 Both screw short pipe 3a Male screw 4 Heat insulation material layer 5 Protective cover 6 Connection pipe body 6a Male screw 7 Piping coupler 70 Open ring casing 71 Ring rubber sleeve 72 Tightening bolt 73 Open ring grip ring 73
73a Inward teeth 8 Heat insulating material 8A, 8B Half split 9 Hard protective cover 9a, 9b Half split 90 Buckle (fixing means)
10 Main pipe (existing water pipe)
10a Horizontal pipe (existing water pipe)

Claims (3)

A pair of replacement valve bodies each composed of a check valve and a gate valve each having a female screw at each of the water flow ports, and male screws that are interposed between both replacement valve bodies and screwed into the female screw of the water flow port at both ends. From both the short threaded pipes, a pair of connecting pipes provided with male threads to be screwed into the female threads of the water outlets of both replacement valve bodies only on one end side, and a belt-like metal plate with fastening bolts attached between both ends A pair of pipe couplers in which an annular rubber sleeve is arranged inside an open annular casing, a half-split type heat insulating material made of a foamed synthetic resin molding encapsulating each member and the entire connecting portion of each member, and the heat insulating material Fixing means for fixing the material in an encapsulated state,
The pipe coupler is straddled over a butt portion between the other end side of each connection pipe body screwed to the replacement valve body and a cut end portion obtained by cutting and removing the old valve portion of the existing water distribution pipe, By tightening the tightening bolt of the coupler to reduce the ring opening diameter, the replacement valve body replacing the old valve portion removed in the existing water distribution pipe is connected in communication, and each member including the replacement valve body is connected to the insulation material in encapsulated to existing distribution pipes valve unit replacement kit comprising as fixed by said fixing means.   The kit for exchanging a valve part of an existing water pipe according to claim 1, further comprising a half-shaped hard protective cover that covers an outer periphery of the encapsulated heat insulating material. The pipe coupler is provided with an open annular grip ring having a large number of inward teeth on the inner peripheral side of the opening edges on both sides, and a pair of clamping bolts arranged on both sides in the width direction of the open annular casing. The kit for valve | bulb part replacement | exchange of the existing water distribution pipe of Claim 1 or 2 .

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