JP2021181739A - Meter unit - Google Patents

Abstract

To provide a meter unit capable of taking in water without removing a water meter.SOLUTION: A meter unit 1 has main piping 8 which is arranged between primary side piping 2 and secondary side piping 3 and which passes through a water meter 7, and a by-pass pipe 9 which connects one side with the other side of the water meter 7 in the main piping 8 and which extends on the side of the water meter 7. The main piping 8 has a channel switching valve 21 arranged in a first connection part 8a to which the by-pass pipe 9 is connected, on one side of the water meter 7, and a sluice valve 22 between a second connection part 8b to which the by-pass pipe 9 is connected and the water meter 7, on the other side of the water meter 7. The by-pass pipe 9 is provided with a water flow port 31, a stop valve 32 positioned between the water flow port 31 and the second connection part 8b, and a lid member 33 for sealing the water flow port 31 in an openable and closable manner, so that water can be taken in without removing a water meter.SELECTED DRAWING: Figure 1

Description

The present invention relates to a meter unit capable of taking water without removing the water meter.

Patent Document 1 describes a meter unit installed in the middle of a pipe drawn into a building from a main water pipe. The meter unit of the same document is provided with a water stopcock, a water meter, and a check valve in this order along the water flow direction. The meter unit is housed in a meter box with an open / close lid. The meter box is buried in the ground with the opening / closing lid exposed to the surface of the earth.

Japanese Unexamined Patent Publication No. 2017-141624

If water can be taken from the pipe that is drawn into the building from the main water pipe in the event of a disaster, it will be possible to supply drinkable water to the victims. Further, in such a case, if water is taken from the meter unit, water can be supplied to the outside without performing construction such as forming a water passage port in the pipe. However, when water is taken from the meter unit, there is a problem that the water meter must be removed from the meter unit and a water discharge pipe or the like must be connected to the water meter.

In view of these points, an object of the present invention is to provide a meter unit capable of taking water without removing a water meter.

In order to solve the above problems, the meter unit of the present invention is arranged between the primary side pipe and the secondary side pipe, and has a main pipe passing through the water meter and one side of the water meter in the main pipe. The main pipe has a bypass pipe that connects to the other side of the water meter and extends to the side of the water meter, and the main pipe is a first connection portion to which the bypass pipe is connected to one side of the water meter. The bypass pipe comprises a flow path switching valve arranged in the water meter, a second connection portion to which the bypass pipe is connected on the other side of the water meter, and a sluice valve arranged between the water meter. It is characterized by comprising a water passage port, a water stop plug located between the water passage port and the second connection portion, and a lid member for opening and closing the water passage port so as to be openable and closable.

According to the present invention, the meter unit includes a bypass pipe that does not go through a water meter. Further, the bypass pipe is provided with a water passage port. Therefore, if water flows into the bypass pipe, water can be taken from the water passage port without removing the water meter. Further, according to the meter unit of the present invention, even when the flow direction of water flowing through the meter unit is reversed, the water flowing into the secondary side pipe through the meter unit can be measured normally, and the water can be passed in the event of a disaster. Water can be taken from the water outlet. That is, even when the flow path switching valve is connected to the primary side pipe and water is circulated from the flow path switching valve side, the flow path switching valve is connected to the secondary side pipe and water is circulated from the sluice valve side. Even when the water is allowed to flow, it is possible to measure the water flowing into the secondary side pipe through the meter unit, and it is possible to take water from the water passage port. Therefore, the same meter unit can be used in a plurality of forms according to the intended use. Further, in the present invention, if the water supply pipe of the water supply vehicle is connected to the water inlet when the main water pipe is cut off due to a disaster, the water supplied from the water supply vehicle can be supplied from the water supply vehicle to the building via the meter unit. Can be supplied within. Therefore, in a building used as an evacuation center, a hospital, or various facilities, water from a water truck can be directly delivered to a place in the building that requires water.

In the present invention, the end of the flow path switching valve of the main pipe is connected to the primary side pipe, and the end of the main pipe opposite to the flow path switching valve is connected to the secondary side pipe. The flow path switching valve switches to a first flow path in which water flowing in from the primary side pipe passes through the water meter, or a second flow path in which water flowing in from the primary side pipe flows through a bypass pipe. can do.

Further, in the present invention, in the flow path switching valve, the water flowing from the first flow path, the second flow path, or the primary side pipe flows through the first flow path and the second flow path. It can be switched to the flow path.

In this case, the main pipe may be provided with a check valve between the water meter and the sluice valve.

In the present invention, the end of the flow path switching valve of the main pipe is connected to the secondary side pipe, and the end of the main pipe opposite to the flow path switching valve is connected to the primary side pipe. The flow path switching valve is a fourth flow path in which water flowing from the primary side pipe and passing through the water meter flows into the secondary side pipe, flowing from the primary side pipe and passing through the water meter. It is possible to switch to the fifth flow path in which water flows through the bypass pipe or the sixth flow path in which water flowing from the primary side pipe and passing through the bypass pipe flows into the secondary side pipe. ..

In the present invention, in the flow path switching valve, water flowing from the fourth flow path, the fifth flow path, the sixth flow path, or the primary side pipe and passing through the water meter flows into the fourth flow. It is possible to switch to the path and the seventh flow path flowing through the fifth flow path.

In the present invention, the bypass pipe includes a branch piping member arranged between the flow path switching valve and the water stop valve, and the branch piping member has the flow path switching valve and the water stop valve. The pipe main body portion to be communicated and a branch pipe portion branching from the pipe main body portion are provided, and the branch pipe portion includes a bent portion that bends upward from the pipe main body portion toward the main pipe side. The water passage port is the upper end opening of the branch pipe portion, and the center of the water passage port may be located closer to the main pipe than the pipe shaft of the pipe main body portion. In this way, an external pipe, hose, or the like can be connected to the water passage port from above. Further, in this way, the meter unit can be made smaller in the width direction as compared with the case where the center of the water passage port is separated from the main pipe by the pipe shaft of the pipe main body.

In the present invention, it is desirable that the bypass pipe includes a drain port and a drain plug detachably attached to the drain port. By doing so, the water remaining in the bypass pipe can be discharged after water intake or the like.

In the present invention, the main pipe has a pipe joint mechanism provided between the water meter and a pipe member located next to the water meter, and the pipe joint mechanism is connected to the pipe member. A fixed pipe, a moving pipe supported by the fixed pipe in a state of being movable in the pipe axis direction of the fixed pipe, a fastening mechanism for fastening the moving pipe and the water meter, and the moving pipe with respect to the fixed pipe. It may be equipped with a movement control mechanism that makes it impossible to move. In a meter unit equipped with such a pipe joint mechanism, when the water meter is attached to the main pipe, the moving pipe may be retracted, the water meter may be placed, and then the moving pipe may be advanced and fastened to the water meter. can. Therefore, the water meter can be easily attached and detached.

In the present invention, the main pipe has a reinforcing member extending along the main pipe on the opposite side of the bypass pipe with the main pipe in between, and the main pipe is located next to the water meter and the water meter. It has a pipe joint mechanism provided between the pipe member and the pipe joint mechanism of the fixed pipe connected to the pipe member and the fixed pipe in a state of being movable in the pipe axis direction of the fixed pipe. A moving pipe supported on the inner peripheral side and a lock nut rotatably supported around the pipe axis of the fixed pipe in a state of being immovable in the pipe axis direction of the fixed pipe on the outer peripheral side of the fixed pipe. The moving pipe is provided with a male screw screwed to the lock nut on the outer peripheral surface thereof, is moved by the rotation of the lock nut and crimped to the water meter, and the reinforcing member is the water supply in the main pipe. It is bridged and fixed between a first fixing portion provided on one side of the meter and the pipe joint mechanism and a second fixing portion provided on the other side of the water meter and the pipe joint mechanism in the main pipe. Can be assumed to be. In a meter unit equipped with such a pipe joint mechanism, when the water meter is attached to the main pipe, the moving pipe is retracted, the water meter is placed, and then the moving pipe is advanced and crimped to the water meter. can. Therefore, the water meter can be easily attached and detached. Also, if a reinforcing member is provided on the opposite side of the bypass pipe with the main pipe in between, the main pipe will bend due to the force that the moving pipe is pressed against the water meter when the moving pipe is crimped to the water meter. This can be prevented or suppressed.

In the meter unit of the present invention, water can be taken without removing the water meter. Further, in the present invention, if the water supply pipe of the water supply vehicle is connected to the water supply port when water is cut off, the water supplied from the water supply vehicle can be supplied into the building via the meter unit.

It is a top view when the meter unit is seen from above. It is a side view when the meter unit is seen from the width direction. It is a side view when the meter unit is seen from the pipe axis direction of a main pipe. It is explanatory drawing of the pipe joint mechanism which constitutes the main pipe. It is a side view when the branch pipe member is seen from the pipe axis direction of a main pipe. It is explanatory drawing of the 1st and 2nd form of the meter unit of the 1st installation example. It is explanatory drawing of the 3rd and 4th form of the meter unit of 1st installation example. It is explanatory drawing of the 5th form of the meter unit of 1st installation example. It is explanatory drawing of the 6th form of the meter unit of 1st installation example. It is a top view when the meter unit of the 2nd installation example is seen from above. It is explanatory drawing of the 1st and 2nd form of the meter unit of the 2nd installation example. It is explanatory drawing of the 3rd and 4th form of the meter unit of the 2nd installation example. It is explanatory drawing of the 5th form of the meter unit of the 2nd installation example. It is explanatory drawing of the pipe joint mechanism of another form. It is explanatory drawing of the branch piping member of the modification.

Hereinafter, the meter unit according to the embodiment of the present invention will be described with reference to the drawings.

(Meter unit)
FIG. 1 is a plan view of the meter unit of this example when viewed from above. FIG. 2 is a side view of the meter unit of this example when viewed from the width direction. FIG. 2 shows a case where the meter unit is viewed from the side of the bypass pipe. FIG. 3 is a side view of the meter unit of this example when viewed from the pipe axis direction of the main pipe. In FIGS. 1 to 3, the unit box is shown by a chain line. FIG. 4 is an explanatory diagram of a pipe joint mechanism constituting the main pipe. FIG. 4 shows a part of the pipe joint mechanism in cross section.

The meter unit 1 of this example is installed in the middle of the pipe drawn into the building from the main of the water pipe. As shown in FIGS. 1 and 2, the meter unit 1 is installed between the primary side pipe 2 and the secondary side pipe 3 constituting the pipe. The primary side pipe 2 and the secondary side pipe 3 are buried in the ground. Further, the primary side pipe 2 and the secondary side pipe 3 are arranged on a straight line. The water flowing from the main pipe flows from the primary side pipe 2 toward the secondary side pipe 3.

The meter unit 1 includes a unit main body 5 and a unit box 6 for accommodating the unit main body 5. The unit main body 5 includes a main pipe 8 including a water meter 7, and a bypass pipe 9 connected to the main pipe 8 and bypassing the water meter 7. The main pipe 8 extends coaxially with the primary side pipe 2 and the secondary side pipe 3 and connects the primary side pipe 2 and the secondary side pipe 3. The bypass pipe 9 connects one side of the water meter 7 in the main pipe 8 and the other side of the water meter 7. The bypass pipe 9 extends to the side of the water meter 7.

Further, the unit main body 5 has reinforcing members 10 spanned on both sides of the water meter 7 in the main pipe 8 on the opposite side of the bypass pipe 9 with the main pipe 8 sandwiched between them. Further, the unit main body 5 is arranged below the main pipe 8 and includes a base 11 that supports one side and the other side of the water meter 7 in the main pipe 8.

As shown in FIGS. 2 and 3, the unit box 6 has a rectangular parallelepiped shape as a whole. The unit box 6 includes a box-shaped box main body 13 and a ceiling plate 14 detachably covered with the box main body 13. The ceiling plate 14 closes the upper end opening of the box body 13. The ceiling plate 14 is provided with an opening / closing lid 15 at a position overlapping the water meter 7 when viewed from above. The base 11 extends along the bottom plate 16 of the unit box 6. The unit box 6 is buried in the ground so that the ceiling plate 14 is exposed to the ground surface. The meter unit 1 does not include the unit box 6 and may consist only of the unit main body 5.

In the following description, the direction along the pipe axis L of the main pipe 8 is the pipe axis direction X, and the two directions orthogonal to the pipe axis L are the width direction Y and the vertical direction Z. In the vertical direction Z, the upper and lower parts when the meter unit 1 is installed are the upper side Z1 and the lower side Z2, respectively. In the pipe axis direction X, the side where the primary side pipe 2 is located is referred to as the first direction X1, and the side where the secondary side pipe 3 is located is referred to as the second direction X2. In the width direction Y, the side on which the bypass pipe 9 is located is the one side Y1, and the opposite side is the other side Y2.

As shown in FIG. 1, the main pipe 8 has a flow path switching valve 21 arranged in the first connection portion 8a to which the bypass pipe 9 is connected in the first direction X1 of the water meter 7. Further, the main pipe 8 has a sluice valve 22 arranged between the second connection portion 8b to which the bypass pipe 9 is connected and the water meter 7 in the second direction X2 of the water meter 7. Further, the main pipe 8 is provided between the water meter 7 and a piping member (flow path switching valve 21) located next to the water meter 7, and has a pipe joint mechanism 23 for attaching and detaching the water meter 7. Have. Further, the main pipe 8 includes a first pipe joint member 24 that connects between the water meter 7 and the sluice valve 22.

As shown in FIG. 4, the pipe joint mechanism 23 is coaxially supported by the fixed pipe 25 fixed to the flow path switching valve 21 and the fixed pipe 25 in a state of being movable in the pipe axial direction X of the fixed pipe 25. A moving tube 26 is provided. The moving pipe 26 includes a small diameter portion 26a and a large diameter portion 26b having a larger outer diameter than the small diameter portion 26a from the side of the water meter 7 toward the first direction X1. Further, the moving pipe 26 includes an annular flange 26c extending from the end of the small diameter portion 26a in the second direction X2 to the outer peripheral side. The large diameter portion 26b is inserted into the fixed tube 25. The large diameter portion 26b is provided with two annular grooves, and an O-ring 27 is attached to each annular groove. As a result, two O-rings 27 are interposed between the fixed pipe 25 and the moving pipe 26. Further, the pipe joint mechanism 23 includes a fastening mechanism 28 for fastening the moving pipe 26 and the water meter 7, and a movement regulating mechanism 29 for disabling the movement of the moving pipe 26 with respect to the fixed pipe 25.

The fastening mechanism 28 includes a packing 55 arranged between the moving pipe 26 and the water meter 7, an annular flange 26c of the moving pipe 26, and a cap nut 56 having a cap portion 56a that engages with the annular flange 26c. Be prepared. Here, when the cap nut 56 is screwed into the pipe portion of the water meter 7, the moving pipe 26 and the water meter 7 are fastened. When the cap nut 56 is screwed into the water meter 7, the moving pipe 26 moves in the pipe axial direction X by the amount in which the cap nut 56 is screwed.

The movement restricting mechanism 29 includes a joint nut 57 screwed into the tip portion of the fixed pipe 25, a joint packing 58 supported by the outer peripheral surface of the small diameter portion 26a of the moving pipe 26 and abutting against the tip of the fixed pipe 25, and a joint. The packing 58 is provided with a joint washer 59 that comes into contact with the packing 58 from the side opposite to the fixed pipe 25. The joint nut 57 is a cap nut, and includes a cap portion 57a that abuts on the joint washer 59 from the side opposite to the fixed pipe 25. When the joint nut 57 is screwed into the fixed pipe 25, the bag portion 57a moves the joint washer 59 toward the fixed pipe 25. As a result, the joint packing 58 is compressed in the pipe axial direction X between the large diameter portion 26b and the fixed pipe 25 of the moving pipe 26 and the joint washer 59, and in the radial direction between the joint nut 57 and the moving pipe 26. Elastically deforms to. As a result, the joint nut 57 presses the moving pipe 26 toward the inner peripheral side via the joint packing 58. Therefore, the moving pipe 26 cannot move in the pipe axial direction X with respect to the fixed pipe 25.

When removing the water meter 7 from the main pipe 8, first, the joint nut 57 of the movement regulation mechanism 29 is loosened so that the moving pipe 26 can be moved with respect to the fixed pipe 25. Next, the cap nut 56 of the fastening mechanism 28 is loosened to release the fastening between the moving pipe 26 and the water meter 7. After that, the water meter 7 is taken out in the direction intersecting the pipe axis L.

The bypass pipe 9 includes a water passage port 31, a water stop valve 32 located between the second connection portion 8b of the main pipe 8 and the water passage port 31, and a lid member 33 that opens and closes the water passage port 31 so as to be openable and closable. Be prepared. Further, the bypass pipe 9 includes a drain port 34 provided in a lower portion of the bypass pipe 9 and a drain plug 35 detachably attached to the drain port 34. The drain port 34 is provided between the second connection portion 8b of the bypass pipe 9 and the water flow port 31 at a position close to the water flow port 31.

Here, the bypass pipe 9 includes a branch pipe member 36 arranged between the flow path switching valve 21 and the water stop valve 32. The branch pipe member 36 is located on the side of the main pipe 8 (one side Y1 in the width direction Y). The water passage port 31 is provided in the branch piping member 36. FIG. 5 is a side view of the branch piping member 36 when viewed from the pipe axis direction X. As shown in FIGS. 1, 2, and 5, the branch pipe member 36 includes a pipe main body portion 37 that communicates the flow path switching valve 21 and the water stop valve 32, and a branch pipe portion 38 that branches from the pipe main body portion 37. And. The pipe shaft 37a of the pipe main body 37 is parallel to the axis of the main pipe 8. A drain port 34 is provided in the pipe main body 37, and a drain plug 35 is attached to the drain port 34. The branch pipe portion 38 includes a bent portion 38a that bends upward from the pipe main body portion 37 toward the other side Y2 (the side of the main pipe 8) in the width direction Y. The water passage port 31 is an upper end opening of the branch pipe portion 38. The water passage port 31 is closed by the lid member 33. As shown in FIGS. 3 and 5, the center 31a of the water passage port 31 is located on the other side Y2 (the side of the main pipe 8) in the width direction Y from the pipe shaft 37a of the pipe main body 37.

The reinforcing member 10 is made of metal and extends along the main pipe 8. As shown in FIG. 1, the reinforcing member 10 is bridged between a first fixing portion 41 provided in the flow path switching valve 21 and a second fixing portion 42 provided in the second connecting portion 8b of the main pipe 8. Is fixed. More specifically, the flow path switching valve 21 is provided with a first fixing portion 41 projecting on the other side Y2 in the width direction Y. The second pipe joint member 43 constituting the second connecting portion 8b is provided with a second fixing portion 42 projecting on the other side Y2 in the width direction Y. In the reinforcing member 10, both end portions in the pipe axis direction X are fixed to the first fixing portion 41 and the second fixing portion 42, respectively.

The base 11 extends the lower Z2 of the main pipe 8 in the pipe axis direction X. As shown in FIG. 2, a first support portion 45 projecting upward Z1 is provided at an end portion of the base 11 in the first direction X1. At the end of the base 11 in the second direction X2, a second support portion 46 projecting upward Z1 is provided. A flow path switching valve 21 is fixed to the first support portion 45 from the upper Z1. A sluice valve is attached to the second support portion 46 from above Z1. Further, a second pipe joint member 43 constituting the second connection portion 8b is mounted on the second support portion 46. As shown in FIG. 3, in this example, the base 11 and the reinforcing member 10 are integrally formed. The base 11 and the reinforcing member 10 may be separate bodies. Further, the base 11 and the reinforcing member 10 may be omitted.

(First installation example)
FIG. 6 is an explanatory diagram of the first and second forms of the meter unit 1 of the first installation example. FIG. 7 is an explanatory diagram of the third and fourth forms of the meter unit 1 of the first installation example. FIG. 8 is an explanatory diagram of a fifth form of the meter unit 1 of the first installation example. FIG. 9 is an explanatory diagram of a sixth form of the meter unit 1 of the first installation example. In the figure below, the unit box 6 is omitted. In the first installation example, the end of the main pipe 8 on the side of the flow path switching valve 21 is connected to the primary side pipe 2. The end of the main pipe 8 opposite to the flow path switching valve 21 is connected to the secondary side pipe 3. Therefore, the water flowing from the primary side pipe 2 into the meter unit 1 and flowing through the main pipe 8 passes through the flow path switching valve 21, the water meter 7, and the sluice valve 22 in this order, and passes through the second connection portion 8b. Then, it flows to the secondary side pipe 3. The water meter 7 is arranged so that the inlet is directed to the side of the primary side pipe 2 and the outlet is directed to the side of the secondary side pipe 3.

In the first installation example, in the flow path switching valve 21, the water flowing in from the primary side pipe 2 flows through the first flow path S1 passing through the water meter 7, and the water flowing in from the primary side pipe 2 flows through the bypass pipe 9. The water flowing from the flow path S2 or the primary side pipe 2 is switched to the third flow path S3 flowing through the first flow path S1 and the second flow path S2.

In FIG. 6A, the first flow path S1 is selected by the flow path switching valve 21, the sluice valve 22 of the main pipe 8 is opened (O), and the water stop valve 32 of the bypass pipe 9 is closed (X). ) Is the first form. In this case, the water flowing from the primary side pipe 2 flows into the secondary side pipe 3 via the flow path switching valve 21, the water meter 7, and the sluice valve 22 in this order. Therefore, the meter unit 1 can be used as a normal meter unit that measures the water flowing in from the primary side pipe 2 by the water meter 7 and supplies it to the secondary side pipe 3.

In FIG. 6B, the first flow path S1 is selected by the flow path switching valve 21, the sluice valve 22 of the main pipe 8 and the water stop valve 32 of the bypass pipe 9 are opened (O), and the lid member. This is the second form in which the blockage of the water passage port 31 by 33 is released. In this case, the water flowing from the primary side pipe 2 flows through the flow path switching valve 21, the water meter 7, and the sluice valve 22 in this order, and flows into the secondary side pipe 3. Further, the water flowing from the primary side pipe 2 flows into the bypass pipe 9 from the second connection portion 8b after passing through the flow path switching valve 21, the water meter 7, and the sluice valve 22 in this order, and passes through the water stop valve 32. Then, it is discharged from the water passage port 31. Therefore, water can be taken from the meter unit 1. Further, in this case, the total amount of water flowing into the secondary side pipe 3 and water discharged from the water passage port 31 can be measured.

In FIG. 7A, the second flow path S2 is selected by the flow path switching valve 21, the water stop valve 32 of the bypass pipe 9 is opened (O), and the sluice valve 22 of the main pipe 8 is closed (X). ) Is the third form. In this case, the water flowing from the primary side pipe 2 flows through the bypass pipe 9 via the flow path switching valve 21.
It flows into the secondary side pipe 3 via the second connection portion 8b. Further, since the sluice valve 22 of the main pipe 8 is in the closed state (X), water does not flow back toward the water meter 7 from the side of the second connection portion 8b. Therefore, it becomes easy to replace the water meter 7. Further, in this case, the water meter 7 can be replaced without stopping the supply of water to the secondary side pipe 3.

In FIG. 7B, the second flow path S2 is selected by the flow path switching valve 21, the water stop valve 32 of the bypass pipe 9 is closed (X), and the water passage port 31 is closed by the lid member 33. This is the released fourth form. In this case, the water flowing in from the primary side pipe 2 is discharged from the water passage port 31. Therefore, water can be taken from the meter unit 1. Here, if the sluice valve 22 of the main pipe 8 is set to the closed state (X), it is possible to prevent water from flowing back toward the water meter 7 from the side of the second connection portion 8b.

In FIG. 8, the third flow path S3 is selected by the flow path switching valve 21, the sluice valve 22 of the main pipe 8 is set to the open state (O), and the water stop valve 32 of the bypass pipe 9 is set to the closed state (X). In addition, it is the fifth form in which the closure of the water passage port 31 by the lid member 33 is released. In this case, the water flowing from the primary side pipe 2 flows through the flow path switching valve 21, the water meter 7, and the sluice valve 22 in this order, and flows into the secondary side pipe 3. Further, the water flowing from the primary side pipe 2 flows into the bypass pipe 9 via the flow path switching valve 21 and is discharged from the water passage port 31. Therefore, water can be taken while supplying water to the secondary side pipe 3 via the main pipe 8. Further, in this case, the water flowing from the main pipe 8 to the secondary side pipe 3 can be measured.

The sixth form of the meter unit 1 shown in FIG. 9 is adopted to supply water to the inside of the building by using a water truck when water is cut off on the main side of the water pipe due to a disaster or the like.

First, in the state before the water outage occurs, the meter unit 1 is used in the first mode shown in FIG. 6A. Therefore, in the meter unit 1, the first flow path S1 is selected by the flow path switching valve 21. Further, in the meter unit 1, the sluice valve 22 of the main pipe 8 is in the open state (O), and the water stop valve 32 of the bypass pipe 9 is in the closed state (X). Here, when water is cut off, the sluice valve 22 of the main pipe 8 is closed (X) as shown in FIG. Further, the water stop valve 32 of the bypass pipe 9 is opened (O), and the water passage port 31 is released from the closure by the lid member 33. Further, a water supply pipe drawn from the tank of the water supply vehicle is connected to the water passage port 31. As a result, the meter unit 1 is used in the sixth form.

In the sixth embodiment, the first flow path S1 is selected by the flow path switching valve 21, but since water is cut off, there is no inflow of water from the primary side pipe 2 to the meter unit 1. Further, the sluice valve 22 is in the closed state (X). Therefore, even if water comes to flow through the main pipe due to restoration, the water flowing from the primary side pipe 2 does not flow into the secondary side pipe 3.

Here, when water is supplied from the water supply pipe of the water supply vehicle, this water flows into the bypass pipe 9 from the water passage port 31. Further, the water flowing into the bypass pipe 9 flows from the second connection portion 8b to the secondary side of the water meter 7 and the sluice valve 22 in the main pipe 8 and flows into the secondary side pipe 3. As a result, the water supplied from the water truck is supplied to the pipes in the building. Therefore, in the sixth embodiment, water can be supplied to each room in the building by using the meter unit 1 and the piping in the building. Therefore, in the event of a water outage in the event of a disaster, it is possible to directly deliver water from a water truck to a building used as an evacuation center, a hospital, or various facilities where water is needed. can.

(Second installation example)
FIG. 10 is a plan view of the meter unit 1 of the second installation example when viewed from above Z1. FIG. 11 is an explanatory diagram of the first and second forms of the meter unit 1 of the second installation example. FIG. 12 is an explanatory diagram of the third and fourth forms of the meter unit 1 of the second installation example. FIG. 13 is an explanatory diagram of a fifth form of the meter unit 1 of the second installation example. In the second installation example, the distribution direction of the water flowing through the main pipe 8 is reversed from that of the first installation example.

That is, as shown in FIG. 10, in the second installation example, the end of the main pipe 8 on the side of the flow path switching valve 21 is connected to the secondary side pipe 3. The end of the main pipe 8 opposite to the flow path switching valve 21 is connected to the primary side pipe 2. Therefore, the water flowing from the primary side pipe 2 into the meter unit 1 and flowing through the main pipe 8 has a second connection portion 8b, a sluice valve 22, a water meter 7, and a flow path switching valve 21 (first connection portion 8a). It flows to the secondary side pipe 3 via this order. Further, in the bypass pipe 9, the water stop valve 32 is located in the first direction X1 (the side closer to the primary side pipe 2) than the water passage port 31. The water meter 7 is arranged so that the inlet is directed to the side of the primary side pipe 2 and the outlet is directed to the side of the secondary side pipe 3. In the second installation example, the orientation of the water meter 7 is opposite to the orientation of the water meter 7 in the first installation example.

In the second installation example, the flow path switching valve 21 flows in from the fourth flow path S4 and the primary side pipe 2 in which water flowing from the primary side pipe 2 and passing through the water meter 7 flows into the secondary side pipe 3. The fifth flow path S5 in which water passing through the water meter 7 flows into the bypass pipe 9, the sixth flow path S6 in which water flowing in from the primary side pipe 2 and passing through the bypass pipe 9 flows into the secondary side pipe 3, or. The water flowing from the primary side pipe 2 and passing through the water meter 7 is switched to the seventh flow path S7 flowing into the fourth flow path S4 and the fifth flow path S5.

In FIG. 11A, the sluice valve 22 of the main pipe 8 is in the open state (O), the water stop valve 32 of the bypass pipe 9 is in the closed state (X), and the fourth flow path S4 is opened by the flow path switching valve 21. This is the first form selected. In this case, the water flowing in from the primary side pipe 2 flows into the secondary side pipe 3 via the second connection portion 8b, the sluice valve 22, the water meter 7, and the flow path switching valve 21 in this order. Therefore, the meter unit 1 can be used as a normal meter unit that measures the water flowing in from the primary side pipe 2 by the water meter 7 and supplies it to the secondary side pipe 3.

In FIG. 11B, the sluice valve 22 of the main pipe 8 is in the open state (O), the water stop valve 32 of the bypass pipe 9 is in the closed state (X), and the water passage port 31 is closed by the lid member 33. This is the second mode in which the fifth flow path S5 is selected by the flow path switching valve 21 after being released. In this case, the water flowing in from the primary side pipe 2 flows into the bypass pipe 9 via the second connection portion 8b, the sluice valve 22, the water meter 7, and the flow path switching valve 21, and is discharged from the water passage port 31. Is done. Therefore, water can be taken from the meter unit 1. Further, in this case, water can be taken from the water passage port 31 in a state where the supply of water to the secondary side pipe 3 is stopped. Further, in this case, the water discharged from the water passage port 31 can be weighed.

In FIG. 12A, the sluice valve 22 of the main pipe 8 is in the closed state (X), the water stop valve 32 of the bypass pipe 9 is in the open state (O), and the sixth flow path S6 is opened by the flow path switching valve 21. This is the third form selected. In this case, the water flowing from the primary side pipe 2 flows from the second connection portion 8b to the secondary side pipe 3 via the bypass pipe 9. As a result, water does not flow through the water meter 7, so that the water meter 7 can be replaced. Further, in this case, the water meter 7 can be replaced without stopping the supply of water to the secondary side pipe 3.

In FIG. 12B, the sluice valve 22 of the main pipe 8 is in the open state (O), the water stop valve 32 of the bypass pipe 9 is in the closed state (X), and the water passage port 31 is closed by the lid member 33. This is the fourth mode in which the seventh flow path S7 is selected by the flow path switching valve 21 after being released. In this case, the water flowing in from the primary side pipe 2 flows into the secondary side pipe 3 via the second connection portion 8b, the sluice valve 22, the water meter 7, and the flow path switching valve 21 in this order. Further, the water flowing from the primary side pipe 2 flows into the bypass pipe 9 via the flow path switching valve 21 and is discharged from the water passage port 31. Therefore, water can be taken while supplying water to the secondary side pipe 3 via the main pipe 8. Further, in this case, the total amount of water flowing into the secondary side pipe 3 and water discharged from the water passage port 31 can be measured.

The fifth form of the meter unit 1 shown in FIG. 13 is adopted to supply water into the building when water is cut off on the main side of the water pipe due to a disaster or the like.

First, in the state before the water outage occurs, the meter unit 1 is used in the first mode shown in FIG. 11A. Therefore, in the meter unit 1, the sluice valve 22 of the main pipe 8 is in the open state (O), and the water stop valve 32 of the bypass pipe 9 is in the closed state (X). Further, in the meter unit 1, the fourth flow path S4 is selected by the flow path switching valve 21. Here, when water interruption occurs, as shown in FIG. 13, the sixth flow path S6 in which water passing through the bypass pipe 9 flows to the secondary side pipe 3 is selected by operating the flow path switching valve 21. .. In addition, the closure of the water passage port 31 by the lid member 33 is released. Further, a water supply pipe drawn from the tank of the water supply vehicle is connected to the water passage port 31. As a result, the meter unit 1 is used in the fifth form.

In the fifth embodiment, the sluice valve 22 of the main pipe 8 is in the open state (O), but since water is cut off, there is no inflow of water from the primary side pipe 2 to the meter unit 1. Further, since the sixth flow path S6 is selected by the flow path switching valve 21, even if water flows through the main pipe due to restoration, the water flowing in from the primary side pipe 2 will be the secondary side pipe. It does not flow into 3.

Here, when water is supplied from the water supply pipe of the water supply vehicle, this water flows into the bypass pipe 9 from the water passage port 31. Further, the water flowing into the bypass pipe 9 flows into the secondary side pipe 3 via the flow path switching valve 21. As a result, the water supplied from the water truck is supplied to the pipes in the building. Therefore, in the fifth embodiment, water can be supplied to each room in the building by using the meter unit 1 and the piping in the building. Therefore, in the event of a water outage in the event of a disaster, it is possible to directly deliver water from a water truck to a building used as an evacuation center, a hospital, or various facilities where water is needed. can.

(Action effect)
According to this example, the meter unit 1 includes a bypass pipe 9 that does not pass through the water meter 7. Further, the bypass pipe 9 is provided with a water passage port 31. Therefore, if water flows into the bypass pipe 9, water can be taken from the water passage port 31 without removing the water meter 7.

Further, according to the meter unit 1 of this example, even when the flow path switching valve 21 is connected to the primary side pipe 2 and water is circulated from the side of the flow path switching valve 21, the flow path switching valve 21 is secondary. Even when water is circulated from the side of the sluice valve 22 by connecting to the side pipe 3, it is possible to measure the water flowing into the secondary side pipe 3 via the meter unit 1 and from the water passage port 31. Water can be taken. Therefore, the same meter unit 1 can be used in a plurality of forms depending on the intended use.

Further, in this example, if the water supply pipe of the water supply vehicle is connected to the water inlet 31 when the main water pipe is cut off due to a disaster, the water supplied from the water supply vehicle can be supplied from the water supply vehicle via the meter unit 1. , Can be supplied in the building. Therefore, in a building used as an evacuation center, a hospital, or various facilities, water from a water truck can be directly delivered to a place in the building that requires water.

Further, in this example, in the bypass pipe 9, the branch piping member 36 arranged between the flow path switching valve 21 and the water stop valve 32 is a piping main body that communicates the flow path switching valve 21 and the water stop valve 32. A portion 37 and a branch pipe portion 38 branching from the pipe main body portion 37 are provided. The branch pipe portion 38 includes a bent portion 38a that bends upward Z1 from the pipe main body portion 37 toward the main pipe 8 side. The water passage port 31 is the upper end opening of the branch pipe portion 38, and the center 31a of the water passage port 31 is the piping main body portion 37.
It is located on the side of the main pipe 8 with respect to the pipe shaft 37a of the above. Therefore, if the ceiling plate 14 of the unit box 6 is removed, external pipes, hoses, etc. can be connected to the water passage port 31 from the upper Z1. Further, since the center 31a of the water passage port 31 is located on the side of the main pipe 8 with respect to the pipe shaft 37a of the pipe main body 37, the center 31a of the water passage port 31 is the main pipe with respect to the pipe shaft 37a of the pipe main body 37. The meter unit 1 can be made smaller in the width direction Y as compared with the case where it is separated from 8.

Further, in this example, the pipe joint mechanism 23 is arranged between the flow path switching valve 21 and the water meter 7 in the main pipe 8. The pipe joint mechanism 23 includes a fixed pipe 25 fixed to the flow path switching valve 21, a moving pipe 26 coaxially supported by the fixed pipe 25 in a state of being movable in the pipe axial direction X of the fixed pipe 25, and a moving pipe. It is provided with a fastening mechanism 28 for fastening the 26 and the water meter 7, and a movement control mechanism 29 for disabling the movement of the moving pipe 26 with respect to the fixed pipe 25. Therefore, the installation work of attaching the water meter 7 to the main pipe 8 and the removal work of removing the water meter 7 from the main pipe 8 are easy. Further, in this example, the reinforcing member 10 is provided on the side opposite to the bypass pipe 9 with the main pipe 8 sandwiched between them. Therefore, it is possible to prevent or suppress the bending of the main pipe 8 when the water meter 7 is attached or detached. The reinforcing member 10 may be omitted.

(Modification example)
Here, instead of the first pipe joint member 24, the pipe joint mechanism 23 may be provided between the water meter 7 and the sluice valve 22. That is, the pipe joint mechanism 23 may be provided between the water meter 7 and the piping member (gate valve 22) located next to the water meter 7. In this case, the water meter 7 and the flow path switching valve 21 can be connected by the first pipe joint member 24.

Further, instead of the pipe joint mechanism 23 described above, another type of pipe joint mechanism 23A that crimps the moving pipe 26 to the water meter 7 may be used. FIG. 14 is an explanatory diagram of another form of the pipe joint mechanism. FIG. 14A shows a state before the moving pipe 26 is crimped to the water meter 7, and FIG. 14B shows a state where the moving pipe 26 is crimped to the water meter 7. In FIG. 14, a part of the pipe joint mechanism is shown in cross section. Since the pipe joint mechanism 23A of this example has a configuration corresponding to the pipe joint mechanism 23 described above, the corresponding configuration will be described with the same reference numerals.

The pipe joint mechanism 23A of this example is fixed to a fixed pipe 25 fixed to a piping member (flow path switching valve 21) located next to the water meter 7 in a state of being movable in the pipe axial direction X of the fixed pipe 25. A moving tube 26 coaxially supported on the inner peripheral side of the tube 25 is provided. Further, the pipe joint mechanism 23A has a locknut 70 rotatably supported around the pipe axis of the fixed pipe 25 in a state of being immovable in the pipe axis direction X of the fixed pipe 25 on the outer peripheral side of the fixed pipe 25. Be prepared. In the moving pipe 26, two annular grooves are provided at the end portion on the side of the fixed pipe 25, and an O-ring 27 is attached to each annular groove. As a result, two O-rings 27 are interposed between the fixed pipe 25 and the moving pipe 26 in the radial direction.

The moving pipe 26 is provided with a male screw 71 screwed to the locknut 70 on the outer peripheral surface. Further, the moving pipe 26 is provided with a concave receiving portion 72 for receiving the pipe portion of the water meter 7 at the end portion on the side of the water meter 7. An O-ring 73 is held in the receiving portion 72. The moving pipe 26 moves back and forth in the pipe axial direction X of the fixed pipe 25 due to the rotation of the locknut 70.

When connecting the flow path switching valve 21 and the water meter 7 by the pipe joint mechanism 23A, as shown in FIG. 14A, first, the moving pipe 26 is retracted to a position away from the water meter 7. The pipe portion of the water meter 7 is received in the receiving portion 72. Next, the locknut 70 is rotated to advance the moving pipe 26 toward the water meter 7. Then, the moving pipe 26 is pressed against the water meter 7. As a result, as shown in FIG. 14B, the moving pipe 26 is in a state of being crimped to the water meter 7 via the O-ring 73. When removing the water meter 7 from the main pipe 8, the locknut 70 is rotated to retract the moving pipe 26 in a direction away from the water meter 7.

Even when the pipe joint mechanism 23A of this example is used, the installation work of attaching the water meter 7 to the main pipe 8 and the removal work of removing the water meter 7 from the main pipe 8 are easy. Here, the meter unit 1 is provided with a reinforcing member 10 on the side opposite to the bypass pipe 9 with the main pipe 8 interposed therebetween. Therefore, when the moving pipe 26 is crimped to the water meter 7, it is possible to prevent or suppress the bending of the main pipe 8 due to the force of the moving pipe 26 being pressed against the water meter 7.

(Another example of branch piping member)
FIG. 15 is an explanatory diagram of a branch piping member of a modified example. The branch piping member 36A of the modified example can be used in place of the branch piping member 36 described above. FIG. 15A shows a case where the branch pipe member 36A of the modified example is viewed from the side of the main pipe 8, and FIG. 15B shows a case where the branched pipe member 36A of the modified example is viewed from the pipe axial direction X. Is. In FIG. 15B, a part of the branch piping member 36A of the modified example is shown in cross section. Since the branch piping member 36A of the modified example has a configuration corresponding to the branch piping member 36, the same reference numerals are given to the corresponding configurations.

As shown in FIG. 15A, the branch pipe member 36A has a pipe main body portion 37 that communicates the flow path switching valve 21 and the water stop valve 32, and a branch pipe portion 38 that branches from the pipe main body portion 37. Be prepared. The pipe shaft 37a of the pipe main body 37 is parallel to the axis of the main pipe 8. A drain port 34 is provided in the pipe main body 37, and a drain plug 35 is attached to the drain port 34. As shown in FIG. 15B, the branch pipe portion 38 includes a bent portion 38a that bends upward from the pipe main body portion 37 toward the other side Y2 (the side of the main pipe 8) in the width direction Y. The water passage port 31 is an upper end opening of the branch pipe portion 38. The water passage port 31 is closed by the lid member 33.
The center 31a of the water passage port 31 is located on the other side Y2 (the side of the main pipe 8) in the width direction Y from the pipe shaft 37a of the pipe main body 37.

Here, the branch pipe member 36A is composed of two members, a first pipe member 61 including a pipe main body portion 37, and a second pipe member 62 including a bent portion 38a and a water passage port 31. The first pipe member 61 includes a main pipe portion 61a constituting the pipe main body portion 37, and a connecting pipe portion 61b protruding from the middle of the main pipe portion 61a in a direction orthogonal to the main pipe portion 61a. The main pipe portion 61a is provided with a drain port 34. The connecting pipe portion 61b is provided with two annular grooves, and an O-ring 63 is attached to each annular groove. The connecting pipe portion 61b includes a flange 61c extending outward on the boundary portion with the main pipe portion 61a. Further, the first pipe member 61 includes a first bolt fastening portion 61d for fixing the branch pipe member 36A to the bottom plate 16 of the unit box 6. The first bolt fastening portion 61d extends downward Z2 from the main portion 61a.

The second pipe member 62 extends in the vertical direction Z. The second pipe member 62 is provided with an opening 62a at the lower end portion. Further, the second pipe member 62 is provided with a bent portion 38a on the side opposite to the opening 62a at the lower end portion. Further, the second pipe member 62 includes a tubular portion 62b extending inward of the second pipe member 62 from the opening edge of the opening 62a. Further, the second pipe member 62 includes a second bolt fastening portion 62c for fixing the branch pipe member 36A to the bottom plate 16 of the unit box 6. The second bolt fastening portion 62c extends downward Z2 from the lower end portion of the bent portion 38a.

Here, in the first pipe member 61, the connecting pipe portion 61b is inserted into the tubular portion 62b of the second pipe member 62 via the opening 62a, and the flange 61c is in contact with the opening edge of the opening 62a. It is integrated with the pipe member 62. Two O-rings 63 are interposed between the connecting pipe portion 61b of the first pipe member 61 and the cylinder portion 62b of the second pipe member 62.

Even when the branch pipe member 36A of this example is used, the branch pipe portion 38 of the branch pipe member 36A includes a bent portion 38a that bends upward Z1 from the pipe main body portion 37 toward the main pipe 8. The water passage port 31 is the upper end opening of the branch pipe portion 38, and the center 31a of the water passage port 31 is located closer to the main pipe 8 than the pipe shaft 37a of the pipe main body portion 37. Therefore, if the ceiling plate 14 of the unit box 6 is removed, external pipes, hoses, etc. can be connected to the water passage port 31 from the upper Z1. Further, since the center 31a of the water passage port 31 is located on the side of the main pipe 8 with respect to the pipe shaft 37a of the pipe main body 37, the center 31a of the water passage port 31 is the main pipe with respect to the pipe shaft 37a of the pipe main body 37. The meter unit 1 can be made smaller in the width direction Y as compared with the case where it is separated from 8. Further, since the branch piping member 36A is composed of two members, it is easy to manufacture the branch piping member 36A.

1 ... Meter unit, 2 ... Primary side piping, 3 ... Secondary side piping, 5 ... Unit body, 6 ... Unit box, 7 ... Water meter, 8 ... Main piping, 8a ... First connection part, 8b ... Second connection Part, 9 ... bypass pipe, 10 ... reinforcing member, 11 ... base, 13 ... box body, 14 ... ceiling plate, 15 ... opening / closing lid, 16 ... bottom plate, 21 ... flow path switching valve, 22 ... sluice valve, 23 ... pipe Joint mechanism, 24 ... 1st pipe joint member, 25 ... fixed pipe, 26 ... moving pipe, 26a ... small diameter part, 26b ... large diameter part, 26c ... annular flange, 27 ... O ring, 28 ... fastening mechanism, 29 ... moving Regulatory mechanism, 31 ... Water flow port, 31a ... Center of water flow port, 32 ... Water stop valve, 33 ... Lid member, 34 ... Drain port, 35 ... Drain plug, 36, 36A ... Branch piping member, 37 ... Piping body, 37a ... pipe shaft, 38 ... branch pipe portion, 38a ... bent portion, 41 ... first fixing portion, 42 ... second fixing portion, 43 ... second pipe joint member, 45 ... first support portion, 46 ... second support Part, 50 ... Check valve, 55 ... Packing, 56 ... Bag nut, 56a ... Bag part, 57 ... Joint nut, 57a ... Bag part, 58 ... Joint packing, 59 ... Joint seat, 61 ... First pipe member, 61a ... Main pipe part, 61b ... Connection pipe part, 61c ... Flange, 61d ... First bolt fastening part, 62 ... Second pipe member, 62a ... Opening, 62b ... Cylinder part, 62c ... Second bolt fastening part, 63 ... O Ring, 70 ... Lock nut, 71 ... Male screw, 72 ... Receiving part, 73 ... O ring, S1 ... 1st flow path, S2 ... 2nd flow path, S3 ... 3rd flow path, S4 ... 4th flow path, S5 ... 5th flow path, S6 ... 6th flow path, S7 ... 7th flow path, X ... pipe axis direction of main pipe, Y ... width direction, Z ... vertical direction

Claims (10)

The main pipe, which is located between the primary side pipe and the secondary side pipe and goes through the water meter,
It has a bypass pipe that connects one side of the water meter and the other side of the water meter in the main pipe and extends to the side of the water meter.
The main pipe includes a flow path switching valve arranged on one side of the water meter at a first connection portion to which the bypass pipe is connected.
A sluice valve arranged between the second connection portion to which the bypass pipe is connected and the water meter on the other side of the water meter is provided.
The bypass pipe is characterized by including a water passage port, a water stop valve located between the water passage port and the second connection portion, and a lid member that opens and closes the water passage port. unit. The end of the flow path switching valve of the main pipe is connected to the primary side pipe.
The end of the main pipe opposite to the flow path switching valve is connected to the secondary side pipe.
The flow path switching valve switches the water flowing from the primary side pipe to the first flow path passing through the water meter or the water flowing from the primary side pipe to the second flow path flowing through the bypass pipe. The meter unit according to claim 1. The flow path switching valve switches the water flowing from the first flow path, the second flow path, or the primary side pipe to the first flow path and the third flow path through the second flow path. The meter unit according to claim 2. The meter unit according to claim 2 or 3, wherein the main pipe is provided with a check valve between the water meter and the sluice valve. The end of the flow path switching valve of the main pipe is connected to the secondary side pipe.
The end of the main pipe opposite to the flow path switching valve is connected to the primary side pipe.
The flow path switching valve is a fourth flow path in which water flowing from the primary side pipe and passing through the water meter flows into the secondary side pipe, and water flowing in from the primary side pipe and passing through the water meter. Is switched to a fifth flow path through which the bypass pipe flows, or a sixth flow path in which water flowing from the primary side pipe and passing through the bypass pipe flows into the secondary side pipe. The meter unit according to 1. In the flow path switching valve, water flowing from the fourth flow path, the fifth flow path, the sixth flow path, or the primary side pipe and passing through the water meter flows into the fourth flow path and the first flow path. The meter unit according to claim 5, wherein the meter unit is switched to a seventh flow path flowing through the five flow paths. The bypass pipe includes a branch piping member arranged between the flow path switching valve and the water stop valve.
The branch pipe member includes a pipe main body portion that communicates the flow path switching valve and the water stop valve, and a branch pipe portion that branches from the pipe main body portion.
The branch pipe portion includes a bent portion that bends upward from the pipe main body portion toward the main pipe side.
The water passage port is an upper end opening of the branch pipe portion, and is
The meter unit according to any one of claims 1 to 6, wherein the center of the water passage port is located closer to the main pipe than the pipe shaft of the pipe main body. The meter unit according to any one of claims 1 to 7, wherein the bypass pipe includes a drain port and a drain plug detachably attached to the drain port. The main pipe has a pipe joint mechanism provided between the water meter and a pipe member located next to the water meter.
The pipe joint mechanism includes a fixed pipe connected to the piping member, a moving pipe supported by the fixed pipe in a state of being movable in the pipe axis direction of the fixed pipe, and the moving pipe and the water meter. The meter unit according to any one of claims 1 to 8, further comprising a fastening mechanism for fastening and a movement restricting mechanism for disabling the movement of the moving pipe with respect to the fixed pipe. It has a reinforcing member that extends along the main pipe on the opposite side of the bypass pipe with the main pipe in between.
The main pipe has a pipe joint mechanism provided between the water meter and a pipe member located next to the water meter.
The pipe joint mechanism includes a fixed pipe connected to the pipe member, a moving pipe supported on the inner peripheral side of the fixed pipe in a state of being movable in the pipe axis direction of the fixed pipe, and an outer circumference of the fixed pipe. A lock nut that is rotatably supported around the tube axis of the fixed tube while being immovable in the direction of the tube axis of the fixed tube on the side is provided.
The moving pipe is provided with a male screw screwed to the locknut on the outer peripheral surface, is moved by the rotation of the locknut, and is crimped to the water meter.
The reinforcing member is provided on one side of the water meter and the pipe joint mechanism in the main pipe, and on the other side of the water meter and the pipe joint mechanism in the main pipe. 2. The meter unit according to any one of claims 1 to 8, wherein the meter unit is bridged and fixed to a fixed portion.

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