JP4701218B2 - Replacement method of gas piping equipment and fluid communication jig - Google Patents

Description

  The present invention relates to a gas piping device replacement method and a fluid communication jig for replacement, which can safely and easily perform replacement work of a gas meter disposed in each household from a gas supply source.

  Conventionally, when exchanging a gas meter, Patent Document 1 describes that the gas meter is hermetically maintained and gas is replaced in the gas meter by using an airtight retainer.

According to this, the airtight holding device includes a mounting member that is mounted on the secondary side piping port of the gas meter, and includes a shutter member that can open and close the secondary side piping port. The shutter member has a discharge port for discharging the air of the gas meter to the outside, and a supply port for supplying the gas supplied from the primary side to the secondary side. The hermetic holding device has a split structure that can be opened and closed, and is configured to be detachable from the new gas meter after the new gas meter is attached to the primary side pipe and the secondary side pipe.
JP 2002-310766 (refer to pages 3 to 8 and FIGS. 3 to 4)

  However, in the airtight holding device described in Patent Document 1, the primary side pipe joint connected to the primary side pipe in the existing gas pipe path and the secondary side pipe joint connected to the secondary side pipe are universal joints. In some cases, it can be suitably used. The configuration of connecting to the gas meter using a universal joint is performed exclusively, and generally, it is connected to the gas meter using a joint as shown in FIG. That is, the pipe joint 61 of the type shown in FIG. 19 is formed in a stepped cylindrical shape in which the joint part 62 at the tip has a large diameter flange part 63 and a small diameter cylindrical part 64 at the tip. Although the packing 65 is attached to the small-diameter cylindrical portion 64, the length of the small-diameter cylindrical portion 64 is different and longer than the thickness of the packing 65 when the pipe joint 61 is made by a different manufacturer or has a different specification. There is something to form. In this case, the distal end portion of the pipe joint 61 interferes with the shutter member of the airtight holding device that slides, which may damage the shutter member or cause gas leakage. Could not be used.

This invention solves the above-mentioned subject, and even if the pipe joint currently used for the existing gas piping path is a type which is not a universal joint, replacement | exchange of the gas piping apparatus which can work safely and easily The purpose is to provide a method, and in order to achieve the purpose, the following steps are taken. That is,
In the first aspect of the invention, a primary side pipe connected from a gas supply source is connected to the primary side piping port via a primary side pipe joint, and the secondary side piping port is connected to the home. A gas piping device replacement method for replacing an existing gas piping device to which a secondary side pipe is connected through a secondary side pipe joint with a new gas piping device, the secondary piping of the new gas piping device A cap member having a sheet member formed with a notch for opening / closing or shielding the air passage is attached to the side pipe opening, and a plug member having a gas air passage is screwed to the secondary pipe joint, In the state where the cap member and the plug member are connected to a measuring device so as to communicate with each other, the secondary side pipe joint is closed after the primary side pipe port of the new gas pipe fitting is attached to the primary side pipe joint. The new gas piping device The gas from the primary side piping to supply the new gas pipe in the instrument within the air of said new gas pipe appliance is characterized in that to replace the gas.

  In the invention according to claim 2, the primary side pipe connected from the gas supply source is connected to the primary side pipe port via the primary side pipe joint, and the secondary side pipe port is piped in the home. A gas piping device replacement method for replacing an existing gas piping device to which a secondary side pipe is connected through a secondary side pipe joint with a new gas piping device, the secondary piping of the new gas piping device A cap member having a sheet member formed with a notch for opening / closing or shielding the air passage is attached to the side pipe opening, and a plug member having a gas air passage is screwed to the secondary pipe joint, In a state where the cap member and the plug member are connected so as to be able to communicate with a measuring device, the primary side pipe port of the novel gas piping device is attached to the primary side pipe joint, and then the secondary side pipe joint is In an open state so that gas can flow, By supplying gas from the primary side pipe into the standard gas pipe fixture and into the new gas pipe fixture and the secondary side pipe, at least air tightness in the new gas pipe fixture and the secondary side pipe is achieved. It is characterized by performing an inspection.

  In invention of Claim 3, the said cap member is provided with the said sheet member, The inner valve which can be engaged with the secondary side piping port of the said gas piping instrument, The outer cap which externally fits the said inner valve, And an inner cap having a piping member attached to the outer cap and capable of communicating with the secondary pipe joint or the measuring device.

  In the invention according to claim 4, the fluid communication jig according to the present invention is connected to the primary piping port connected to the primary piping connected from the gas supply source to the gas piping device, and is piped in the home. And a secondary side pipe port connected to the secondary side pipe, and a fluid communication jig attached to the secondary side pipe port, the sheet having a notch for opening / closing or shielding the air passage An inner valve that has a member and can be engaged with a secondary side piping port of the gas piping device, an outer cap that externally fits the inner valve, and is attached to the outer cap and can communicate with the secondary pipe joint An inner cap having a piping member, and shielding a state in which the gas in the new gas piping device flows out of the gas piping device and an inflow of fluid into the new gas piping device. Condition and shape And it is characterized in that it is configured to be capable.

  The invention according to claim 5 is characterized in that the inner valve has a semi-annular inner valve body and is configured to be detachable from a secondary side piping port of the gas piping device.

  The invention according to claim 6 is characterized in that the seat portion of the inner valve is actuated so as to be pressed by a protruding pin disposed in the cap portion.

  According to the gas pipe fitting replacement method of the present invention, when a new gas pipe fitting is installed, the new gas pipe fitting is inserted into the new gas pipe fitting before connecting the secondary pipe port of the new gas pipe fitting to the secondary pipe. The air filled in is replaced with gas. In this case, first, the primary side piping port of the new gas piping device is connected to the primary side pipe joint. On the other hand, a cap member having a sheet member formed with a notch for opening / closing or shielding the air passage is attached to the secondary side piping port of the novel gas piping device, and the gas passage is provided in the secondary pipe joint. The plug member provided is screwed. A measuring device is connected, for example, with a gas hose between the cap member and the plug member. At this time, the secondary side pipe joint is closed to prevent the gas from flowing through the secondary side pipe. Then, the primary side pipe is opened and gas is supplied from the primary side pipe. Thus, the air in the new gas piping device is discharged to the atmosphere by keeping the valve of the measuring device open, or the air mixed with the gas is collected in the collection bag. When a predetermined oxygen concentration is detected by the measuring device, the gas in the gas piping device will be filled. Therefore, in this state, the secondary side pipe port of the new gas piping device is connected to the secondary side pipe joint.

  As described above, the present invention attaches a cap member to the secondary side piping port of the gas piping device without connecting the secondary side piping port of the new gas piping device to the secondary side pipe joint, Since a plug member is attached to the joint for the secondary pipe and the air in the new gas piping fixture is replaced with gas, the gas replacement is performed even if the secondary pipe joint is not equipped with the dedicated packing for the universal joint. Work can be done. In addition, mounting the fluid communication jig is simple and easy because it is simply screwed into the secondary pipe port screw of the gas pipe fitting and screwed into the secondary pipe joint screw. Can be done in time.

  In addition, according to the present invention, when a new gas piping device is mounted, at least the inside of the new gas piping device and the secondary side after the secondary side piping port of the new gas piping device communicates with the secondary side piping. Measure the airtightness of the piping. In this case, the primary side piping port of the novel gas piping device is connected to the primary side pipe joint. On the other hand, a plug having a gas vent on the secondary side pipe joint is mounted on the secondary side pipe opening of the new gas pipe fitting with a cap member having a sheet member formed with a notch for opening / closing or shielding the vent path The member is mounted, and the measuring device is connected to the cap member and the plug member with a gas hose, for example. At this time, the secondary side pipe joint is left open to allow gas flow. Then, the primary side pipe is opened and gas is supplied from the primary side pipe. As a result, the gas in the new gas piping device is supplied to the secondary piping by keeping the valve of the measuring device closed. And the airtight state in a novel gas piping instrument and secondary side piping can be measured by making a measuring device act.

  As described above, according to the present invention, the cap member and the plug member are attached and communicated with each other in a state where the secondary side piping port of the novel gas piping device is not connected to the joint for the secondary side pipe. Because the inner and secondary pipes are filled with gas, even if the secondary pipe joint is not equipped with a dedicated packing for universal joints, at least in the new gas pipe fixture and the secondary pipe side airtight Inspection can be performed. In addition, the cap member can be easily screwed into the secondary pipe port screw of the gas piping device, and the plug member can be easily screwed into the secondary pipe joint screw. It can be done in a short time with simple work.

  In addition, according to the fluid communication jig of the present invention, the cap member attached to the secondary side piping port of the new gas piping device has the gas in the new gas piping device outside the new gas piping device. An inner valve that can be formed into a state of flowing out and a state of shielding the inflow of fluid into the novel gas piping device is provided. In other words, the inner valve is formed with a semi-annular inner valve body that is detachably formed at the secondary side piping port of the new gas piping device, and a notch that forms or shields the air passage. A sheet member is provided.

  Therefore, when replacing the gas in the new gas piping device, the notch is opened to release the residual air in the new gas piping device to the outside, and the gas in the new gas piping device is filled. In such a state, the notch is shielded so that gas is not released to the outside until the secondary pipe port of the new gas pipe fitting is attached to the secondary pipe joint of the secondary pipe. . Therefore, by using the cap member, the gas piping device can be safely replaced without causing gas leakage. Also, since the semi-annular inner valve body can be easily attached and detached from the secondary side piping port, it can be used for repeated replacement work by removing it when the gas piping device is attached to the secondary side piping. it can.

  Also, since the inner valve can be opened by pressing the seat part of the inner valve with the protruding pin arranged on the outer cap, the valve can be opened and closed by simply attaching and detaching the outer cap to the inner valve. It can be performed.

  An embodiment of the present invention will be described below with reference to the drawings. In the following description, the gas piping device is described with a gas meter, but is not limited to this, and any gas piping device having a primary side piping port and a secondary side piping port can be applied. Is.

  As shown in FIGS. 1 and 2, the gas meter 1 is arranged outdoors, and is installed in an existing pipe, that is, a primary pipe 5 that is piped from a gas supply source G through a gas plug 4, and various types of pipes that are arranged indoors. The secondary pipe 6 connected to the gas appliance L through the gas piping member P is connected. As shown in FIG. 2, the gas meter 1 has a primary side piping port 2 and a secondary side piping port 3 formed on the upper surface. The primary side pipe port 2 of the gas meter 1 is connected to the primary side pipe joint 8 (8A) via the packing 7 (7A), and the secondary side pipe port 3 is connected to the secondary side pipe joint 8 (8B). (7B). Each pipe joint 8 (8A, 8B) and each piping port 2, 3 of the gas meter 1 are connected by screwing a cap nut 9 (9A, 9B), respectively.

  Further, the distal end portion of the pipe joint 8 (8A, 8B) includes a large diameter flange portion 81 and a small diameter cylindrical portion 82 at the distal end of the large diameter flange portion 81, and the packing 7 is mounted on the outer peripheral surface of the small diameter cylindrical portion 82. Has been. The packing 7 has a single-sided cross section formed in a rectangular shape and has an annular shape on the entire circumference. The distal end portion of the small diameter cylindrical portion 82 projects downward from the lower end surface of the packing 7.

  As the fluid communication jig of the embodiment, the plug member 10 that can be attached to the primary side pipe joint 8A or the secondary side pipe joint 8B, the first cap member 20 that can be attached to the primary side piping port 2 of the gas meter 1, and the gas meter. A second cap member 30 that can be attached to one secondary side piping port 3 is used.

  As shown in FIG. 3, the plug member 10 of the embodiment has a male screw portion 111 that can be screwed into a female screw of a cap nut 9 </ b> A (or 9 </ b> B) of a primary side pipe joint 8 </ b> A (or a secondary side pipe joint 8 </ b> B) at the top. A pipe joint portion 12 including a plug main body 11 to be formed and an opening / closing valve 122 and an operation portion 13 for tightening the plug main body 11 are configured.

  The plug body 11 is formed of a lightweight member such as a resin or a non-ferrous metal, and has an air passage 112 formed from one end surface to the center along the axial direction, and a female screw 113 formed axially from the other end surface. An internal thread 114 is formed at the center of the plug body 11 in a direction perpendicular to the air passage 112. A bolt 131 that is fastened by a knob 132 of the operation unit 13 is screwed into the female screw 113. A joint member 121 of the pipe joint portion 12 is fastened to the female screw 114. The joint member 121 configures, for example, a one-touch joint that can connect a hose with one touch.

  As shown in FIG. 4, the first cap member 20 includes a cap body 21 that is attached to the primary side piping port 2 of the gas meter 1, and a piping joint portion 22 that is connected to the cap body 21. The cap main body 21 is formed in a disk shape at the upper part and is formed in a ring shape that protrudes downward from the upper part. The female screw 211 is screwed into the primary side piping port 2 of the gas meter 1. Further, a female screw 212 is formed at the upper center portion of the cap body 21, and for example, an L-shaped pipe joint portion 22 is screwed together. A packing 23 is mounted between the bottom surface of the cap main body 21 and the female screw 211, and serves as a seal member that prevents gas leakage in the gas meter 1. For example, the pipe joint portion 22 constitutes a one-touch joint that can connect a hose with one touch.

  As shown in FIGS. 5 to 8, the second cap member 30 includes an inner valve 31 attached to the secondary side piping port 3 of the gas meter 1 and a cap portion 40 to which a hose can be connected. ing.

  The inner valve 31 includes a semi-annular inner valve main body 32, a semi-annular under cover 33 mounted on the lower surface side of the inner valve main body 32, and a pair of guides disposed at both ends of the under cover 33 on the opening side. The arm portion 34, the seat portion 35 mounted on the upper surface side of the inner valve main body 32, and a plurality of trace pins 36 arranged on the inner peripheral portion of the inner valve main body 32 are configured. Furthermore, a support pin 37 that supports the seat portion 35 is detachably planted on the upper surface side of the inner valve main body 32.

  The inner valve body 32 is fitted on the secondary side piping port 3 of the gas meter 1 with a semi-annular inner peripheral surface, a male screw 321 is formed at the upper part of the outer peripheral surface, and the under cover 33 is screwed at the lower part of the outer peripheral surface. It is fastened with members. Further, the semicircular annular opening side tip is formed to be slightly larger than the outer diameter of the secondary side pipe port 3 so as to be inserted into the secondary side pipe port 3.

  The under cover 33 is formed in a thin plate shape and is formed in substantially the same shape as the inner valve 32 in a plan view, and hinge pins 331 for rotating the arms 341 of the guide arm portions 34 are provided upright at both ends on the opening side. ing.

  The guide arm portion 34 includes an arm 341 supported by the hinge pin 331 and a guide pin 342 disposed at the tip of the arm 341. As shown in FIG. 9, the pair of arms 341 are installed in the secondary valve port 3 of the gas meter 1 through the opening of the inner valve body 32 with the inner valve 31 opened with the guide arm 34 opened. As shown, the guide pin 342 is brought into contact with the secondary side piping port 3 by rotating from the opening side of the inner valve main body 32 so as to cover the secondary side piping port 3. The guide pin 342 serves as a stopper for mounting an outer cap 41 in the cap portion 40 to be described later, and has a function of stably mounting on the secondary side piping port 3 of the gas meter 1N with the cap portion 40 attached. have.

  The sheet portion 35 is formed by polymerizing a disk-shaped metal sheet 351 and a disk-shaped rubber sheet 352. The metal sheet 351 and the rubber sheet 352 are formed with a Y-shaped notch 353 at the center, and by pressing the notch 353 in the axial direction, a gap is formed and an air passage 354 is formed. . When the notch 353 is not pressed, the notch 353 returns to fill the gap, and the air passage 354 is blocked. The metal sheet 351 is supported by a support pin 37 planted in the inner valve main body 32, is movable in the axial direction of the inner valve main body 32, and is restricted from moving in the horizontal direction relative to the surface direction. Further, the sheet portion 35 may be configured by only the metal sheet 351 without arranging the rubber sheet 352.

  The trace pins 36 are arranged at a plurality of locations on the inner peripheral surface of the inner valve main body 32 (in the illustrated example, at three locations, and on the outer peripheral surface, thread portions 361 that engage with the thread portions of the secondary side piping port 3 of the gas meter 1. The threaded portion 361 can engage the inner valve 31 with the threaded portion of the secondary side piping port 3 of the gas meter 1 and can rotatably support the secondary side piping port 3. .

  As shown in FIG. 5, the cap portion 40 includes an outer cap 41 having a small-diameter hole portion 411 and a large-diameter hole portion 412 and formed in a stepped annular shape, and is screwed into the small-diameter hole portion 411 of the outer cap 41. An inner cap 42 that is arranged together, and a joint member 43 that is screwed into the inner cap 42 are provided.

  On the inner peripheral surface of the outer cap 41, a female screw 413 that is screwed into a male screw 321 formed on the outer peripheral surface of the inner valve main body 32 in the large-diameter hole portion 412 is formed, and the outer cap 41 is screwed into the inner valve main body 32. By doing so, the cap part 40 is integrally attached to the inner valve 31.

  The inner cap 42 is formed with an internal thread 421 passing through the shaft center portion, the joint member 43 is screwed together, and an outer peripheral portion is formed as a concave portion 421 on the lower surface, and a packing 44 is attached to the concave portion 421. The

  The joint member 43 is formed, for example, in an L shape, and a pipe-shaped opening / closing tip 45 is integrally disposed at the tip of a screw portion 431 that is screwed into the inner cap 42. The opening / closing chip 45 extends from the threaded portion 431 of the joint member 43 to a position that protrudes from the lower surface of the packing 44 and does not exceed the lower surface of the outer cap 41.

  Next, the effect | action which replaces the existing gas meter 1 with the new gas meter 1N using the fluid communication jig comprised as mentioned above is demonstrated based on FIGS.

  FIG. 10 shows a state in which the existing gas meter 1 is mounted. When the gas meter 1 is replaced with a new gas meter, the primary side pipe 5 and the secondary side pipe 6 are fixed in order to fix the positions thereof. And the secondary side pipe 6 are connected by a two-pipe fixing device (not shown).

  Next, in the state where the existing gas meter 1 is mounted, an airtight inspection in the pipe is performed. The airtight inspection is performed by connecting the measuring device 51 to the above-described fluid communication jig with the hose 52 and measuring the gas pressure in the pipe. As shown in FIG. 11, the gas stopper 4 is closed and a gas shut-off valve (not shown) disposed in the existing gas meter 1 is closed. The gas shut-off valve is disposed inside the primary side piping port 2 of the gas meter 1 and opens and closes the primary side piping port 2, and is normally opened by pressing the return button B. By hitting, the gas shut-off valve is closed.

  In this state, as shown in FIG. 12, the cap nut 9A on the primary side pipe 5 side is loosened, and the primary side pipe port 2 of the gas meter 1 is detached from the primary side pipe joint 8A. At this time, since the primary side piping port 2 is closed by the gas shutoff valve, no gas is discharged from the desorbed gas meter 1. Then, as shown in FIG. 13, the plug member 10 is attached to the primary side pipe joint 8 </ b> A, the first cap member 20 is attached to the primary side pipe port 2 of the gas meter 1, and then the plug member 10 and the first cap are attached. The member 20 and the measuring device 51 are connected by a hose 52 so that gas can communicate. At this time, the open / close valve 122 in the pipe joint portion 12 of the plug member 10 is opened. The secondary side pipe port 3 of the gas meter 1 is connected to the secondary side pipe joint 8 </ b> B of the secondary side pipe 6.

  In this state, after opening the gas shut-off valve of the gas meter 1 and opening the gas stopper 4 of the primary side pipe 5, the gas supplied from the primary side pipe 5 is communicated with the secondary side pipe 6 to replenish the gas pressure. Then, the gas stopper 4 is closed. An airtight test is performed by operating the measuring device 51 and measuring the gas pressure for a predetermined time. If there is no change in the gas pressure, it is determined that there is no abnormality in the existing gas meter 1 and the secondary side pipe 6 and the airtight inspection is finished, and the secondary side piping port 3 of the gas meter 1 is connected to the secondary side. Detach from the pipe joint 8B.

  Next, a new gas meter 1N is attached. At this time, since the new gas meter 1N is filled with air, gas replacement is performed by extracting the air from the new gas meter 1N and filling it with gas. In this operation, first, as shown in FIG. 14, the plug member 10 removed from the primary side pipe joint 8A is attached to the secondary side pipe joint 8B, and the valve 122 is closed. Then, the second cap member 30 is attached to the secondary side piping port 3 of the new gas meter 1N. When the cap member 30 is attached to the secondary side pipe port 3, as shown in FIG. 15A, the cap member 30 is externally fitted to the secondary side pipe port 3 with the guide arm portion 34 of the inner valve 31 being opened. The secondary side piping port 3 is supported by the guide pin 342 and the trace pin 36 by rotating the 341. Since the thread portion 361 having the same pitch as the thread portion formed in the secondary side piping port 3 of the new gas meter 1N is formed on the trace pin 36, the trace pin 36 is connected to the secondary side piping. By engaging the threaded portion of the port 3, the inner valve 31 can be rotatably supported with respect to the secondary side piping port 3.

  On the other hand, the seat part 35 is attached to the inner valve main body 32, and then the cap part 40 is screwed into the inner valve 31 and attached as shown in FIG. By attaching the cap part 40 to the inner valve 31, the opening / closing chip 45 (see FIG. 5) of the cap part 40 presses the seat part 35 of the inner valve 31, so that the air passage 354 is formed in the seat member 35. It becomes. As a result, the fluid in the new gas meter 1N can flow out of the gas meter 1N.

  Then, as shown in FIG. 16, the plug member 10, the second cap member 30, and the measuring device 51 are connected by a hose 52 so that gas can communicate therewith. Then, the primary side pipe port 2 of the new gas meter 1N is connected to the primary side pipe joint 8A.

  In this state, the gas plug 4 of the primary side pipe 5 is opened, the gas shut-off valve of the new gas meter 1N is opened by pressing the return button B, and gas is supplied from the primary side pipe 5. Thus, the air in the new gas meter 1N is replaced with gas. At this time, if a valve (not shown) arranged in the measuring device 51 is opened, the gas supplied into the gas meter 1N is pushed out of the air and discharged from the valve to the atmosphere, or the air of the gas meter 1N is reduced. It collects in the collection bag which is not illustrated with the gas of the part. When the predetermined oxygen concentration is reached on the display of the measuring device 51, the new gas meter 1N is filled with gas.

  Next, in this state, the on-off valve 122 of the plug member 10 mounted on the secondary side pipe joint 8B is opened, the gas plug 4 of the primary side pipe 5 is closed, and the secondary side pipe 6 from the gas meter 1N is closed. Airtight inspection is performed over the inside. If there is no change in the gas pressure in a certain time on the display of the measuring device 51, it means that there is no gas leak in the pipe and the airtightness is maintained. This completes the airtight inspection.

  Next, the secondary side pipe port 3 of the new gas meter 1N is connected to the secondary side pipe joint 8B. In this case, first, the valve of the measuring device 51 is opened to set the pipe pressure to atmospheric pressure. Thereby, when each fluid communication jig is removed, the gas in the pipe can be prevented from being instantaneously discharged to the atmosphere.

  Only the cap part 40 is removed from the secondary side pipe port 3 of the new gas meter 1N, and the plug member 10 is detached from the secondary side pipe joint 8B. Then, as shown in FIG. 17, the secondary side piping port 3 of the new gas meter 1N is moved directly below the secondary side pipe joint 8B with the inner valve 31 attached. Then, as shown in FIG. 18, when the inner valve 31 is pulled out from the secondary side piping port 3, the guide arm 341 naturally opens and the inner valve 31 can be easily removed. A new gas meter 1N is connected to the primary side pipe 5 and the secondary side pipe 6 by tightening the cap nut 9B of the secondary side pipe joint 8B to the threaded portion of the secondary side pipe port 3, and is similar to FIG. It becomes the state of. When the cap nut 9A of the primary side pipe joint 8A is tightened, the gas meter replacement operation is completed.

  As described above, the gas meter replacement method of the embodiment can achieve the following effects.

  (1) The second cap member 30 is attached to the secondary side piping port 3 of the new gas meter 1N, and the plug member 10 is attached to the secondary side pipe joint 8B, and each is connected to the measuring device by the hose 51. Then, the primary side piping port 2 of the new gas meter 1 is connected to the primary side piping 5. As a result, gas can be supplied from the primary side pipe 5 to the secondary side pipe 6 via the gas meter 1N. Therefore, even if the secondary side pipe joint 8B has the general configuration shown in FIG. The replacement of the air in the new gas meter 1N with the gas can be easily performed in a short time, and the in-pipe airtight inspection including the new gas meter 1N can be easily performed in a short time.

  (2) The second cap member 30 includes an inner valve 31 and a cap portion 40, and the inner valve 31 includes a detachable guide arm portion 34 that can be inserted into the secondary side piping port 3 of the gas meter 1N. Therefore, when the secondary side pipe port 3 of the gas meter 1N is attached to the secondary side pipe joint 8B, the inner valve 31 can be moved even if the secondary side pipe port 3 is moved directly below the secondary side pipe joint 8B. It can be detached and used for repeated gas meter replacement operations.

  (3) Since the inner valve 31 includes the seat portion 35 that can form the air passage 354 or block the air passage 354, the air passage 354 can be formed at the time of gas replacement or an airtight inspection. In addition, when the secondary side pipe port 3 of the gas meter 1N is connected to the secondary side pipe joint 8B, the obstructing cap part 40 can be removed by blocking the air passage 354.

  (4) Since the inner pin 31 is provided with a trace pin 36 in which a screw having the same pitch as that of the screw portion of the secondary side piping port 3 of the gas meter 1 is disposed, the semi-annular inner valve 31 is provided as the secondary valve. Even if it is attached to the side piping port 3, the same state as that in which it is rotatably supported and screw-coupled can be produced.

  (5) Since the gas is circulated between the primary side piping port 2 of the gas meter 1 and the primary side piping 5 or the circulation is stopped by the gas cutoff valve disposed in the gas meter 1, There will be no new valve for the side piping port. As a result, the cost can be reduced and the operation can be simplified.

  The configuration of each fluid communication jig used in the gas meter replacement method of the present invention is not limited to the above-described embodiment.

It is a simplified diagram showing a state where a gas meter is piped. It is the elements on larger scale in FIG. It is sectional drawing which shows the plug member of one form in this invention. It is sectional drawing which shows the 1st cap member of the same form. It is sectional drawing which shows the 2nd cap member. It is sectional drawing which shows the inner valve in FIG. It is a top view in FIG. It is the bottom view. FIG. 7 is a plan view showing an open state of an arm in the inner valve of FIG. 6. It is the 1st operation view showing the procedure of exchange work of a gas meter. It is the 2nd operation figure. It is the 3rd operation figure. It is the 4th operation figure. It is a 5th action figure. It is a 6th action figure. It is a 7th action figure. It is the 8th operation figure. It is the 9th operation figure. It is sectional drawing which shows the connection state of the common pipe joint and gas meter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1N ... Gas meter 2, Primary side piping port 3, Secondary side piping port 5, Primary side piping 6, Secondary side piping 7, Packing 8, Pipe joint 10, Plug member 12, Pipe joint part 122, Open / close valve 20 , First cap member 22, pipe joint part 30, second cap member 31, inner valve 34, guide arm part 35, sheet part 351, metal sheet 353, notch part 354, air passage 36, trace pin 40, Cap part 43, joint part 45, open / close tip 51, measuring device

Claims (6)

Primary side piping connected from the gas supply source is connected to the primary side piping port via a primary side pipe joint, and secondary side piping connected to the home is connected to the secondary side piping port on the secondary side. A gas piping device replacement method for replacing an existing gas piping device connected through a pipe joint with a new gas piping device,
A cap member having a sheet member formed with a notch for opening / closing or shielding the air passage is attached to the secondary side piping port of the novel gas piping device, and a gas air passage to the secondary pipe joint In a state where the cap member and the plug member are connected so as to be able to communicate with the measurement device,
After mounting the primary side piping port of the novel gas piping device to the primary side pipe joint,
With the secondary side pipe joint closed, by supplying gas from the primary side pipe into the new gas pipe device, the air in the new gas pipe device is A method for replacing a gas piping device, wherein the gas piping device is replaced with gas. Primary side piping connected from the gas supply source is connected to the primary side piping port via a primary side pipe joint, and secondary side piping connected to the home is connected to the secondary side piping port on the secondary side. A gas piping device replacement method for replacing an existing gas piping device connected through a pipe joint with a new gas piping device,
A cap member having a sheet member formed with a notch for opening / closing or shielding the air passage is attached to the secondary side piping port of the novel gas piping device, and a gas air passage to the secondary pipe joint In a state where the cap member and the plug member are connected so as to be able to communicate with the measurement device,
After mounting the primary side piping port of the novel gas piping device to the primary side pipe joint,
By supplying the gas from the primary side pipe into the new gas piping device and the secondary side piping in the new gas piping device in a state where the secondary pipe joint is opened to allow gas flow. A gas piping device replacement method comprising performing an airtight inspection at least in the new gas piping device and in the secondary side piping.   The cap member includes the seat member and an inner valve that can be engaged with a secondary piping port of the gas piping device, an outer cap that externally fits the inner valve, and the outer cap that is attached to the outer cap. The method for replacing a gas piping device according to claim 1 or 2, further comprising an inner cap having a piping member capable of communicating with a joint for a secondary pipe or a measuring device. The gas piping device is provided with a primary side piping port connected to a primary side piping connected from a gas supply source and a secondary side piping port connected to a secondary side piping connected in the home. A fluid communication jig attached to the secondary piping port,
An inner valve provided with a seat member formed with a notch for opening and closing or shielding the air passage, and engageable with a secondary side piping port of the gas piping device, an outer cap for externally fitting the inner valve, and the outer An inner cap having a piping member attached to the cap and capable of communicating with the secondary side pipe joint, and a state in which the gas in the new gas piping device flows out of the gas piping device, and the new A fluid communication jig, wherein the fluid communication jig is configured to be capable of being formed in a state in which inflow of fluid into the gas piping device is shielded.   The fluid communication jig according to claim 4, wherein the inner valve has a semi-annular inner valve main body and is detachable from a secondary side piping port of the gas piping device.   The fluid communication jig according to claim 5, wherein the seat portion of the inner valve is actuated so as to be pressed by a projecting pin disposed in the cap portion.

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