JP4376603B2 - Water meter unit - Google Patents

Description

  The present invention relates to a water meter for measuring the amount of water used, and a meter unit capable of providing, as a unit, a stop cock or a connecting device arranged before and after the water meter, such as a housing complex. The present invention relates to a water meter unit suitable for installation in a pipe shaft disposed in the vicinity of a doorway.

  Conventionally, a storage space called a pipe shaft has been provided near the doorway of an apartment house, etc., and a meter unit with a water meter for measuring water usage is installed in this storage space. Yes. Since the water meter installed in the middle of the water pipe needs to be replaced after the lapse of a predetermined period stipulated by the Measurement Law, it can be replaced on the meter unit body by a fixing means such as a screw fixing type or crimp fixing type. Has been. However, in the case of the screw-fixed type, the structure is such that the inner peripheral female threaded portion of the nut provided on both sides of the meter unit main body and the outer peripheral male threaded portion at both ends of the water meter are screwed together. In addition, it is necessary to carry out the operation by always holding the water meter by hand during work because the water meter rotates together with the nut as the nut rotates. It was.

  Therefore, there is now a tendency to adopt a crimping type. This crimp-fixed type is provided with water meter support members on both sides of the meter unit body, and one support member presses the connection end surface of the water meter so that the water meter is sandwiched between both support members. There are a structure using a spring, a structure using a spring, a structure using a cam mechanism, and a structure using a rotating member. Typical examples are shown below (for example, see Patent Document 1 or 2). .)

  The device described in Japanese Patent Laid-Open No. 11-93226 (Patent Document 1) has a check valve cartridge built in a downstream support member that holds a water meter. The support ring is held inside the support member by screwing the mounting ring onto the female screw formed at the end of the meter-side support member body. The mounting ring is provided with a separate receiving surface for supporting the connection end of the water meter, and after placing the connection end of the water meter on the upstream and downstream receiving surfaces, In this structure, the pressure is held by both the upstream and downstream support members.

Also, the device described in Japanese Patent Laid-Open No. 3-137520 (Patent Document 2) is provided in the downstream support member that holds a water meter, as in Japanese Patent Laid-Open No. 11-93226 (Patent Document 1). A check valve cartridge is built in, and this check valve cartridge is held inside the support member by screwing a connecting member into a female screw formed at the end of the cylindrical support member body on the meter side. ing. The connecting member is integrally provided with a receiving surface for receiving the connection end of the water meter, and after placing the connection end of the water meter on both the upstream and downstream receiving surfaces, In this structure, the pressure is held by both the upstream and downstream support members.
Japanese Patent Laid-Open No. 11-93226 Japanese Patent Laid-Open No. 3-137520

  However, in the apparatuses described in JP-A-11-93226 and JP-A-3-137520, when the check valve cartridge or the like is cleaned or replaced, the mounting ring and the connecting member are attached and detached. A tool is necessary, especially in a narrow pipe shaft, and the tool is difficult to handle, and in some cases, a special tool has to be prepared. Therefore, it is conceivable to increase the width of the mounting ring and provide a handle for manual operation on the outer periphery, but this mounting ring is a part that also functions as a contact portion with the water meter. As the width of the ring is increased, the length of the entire apparatus must be increased, and a large installation place is required.

  Furthermore, since the apparatus described in Japanese Patent Application Laid-Open No. 3-137520 (Patent Document 2) is integrally formed with a receiving surface for supporting the connecting end portion of the water meter at the lower end surface of the connecting member. In order to properly support the meter, it is necessary to complete the screwing with the support member after accurately checking the level of the receiving surface, and when it is necessary to remove the connecting member for maintenance etc. Is always accompanied by the work of accurately checking the level of the receiving surface at the time of installation, especially for those who perform maintenance work in poorly working conditions such as dark places and narrow places. It is extremely difficult to accurately check the degree. If a water meter is supported on a receiving surface that does not have levelness, the meter's shaft center will not be held at the proper position, reducing the sealing performance and causing fluid leakage. Living It ruosore be had.

  In addition, the apparatus described in Japanese Patent Laid-Open No. 3-137520 (Patent Document 2) greatly reduces the space below the water meter with a protrusion on the base body that prevents inadvertent rotation of the water meter. Since it is provided in such a state, it is not possible to secure an effective gap between the water meter and the base body, and it is not possible to insert a heat insulation material for preventing freezing of the water meter into this part. Etc. also had problems.

  The present invention has been developed as a result of diligent research in view of the above-mentioned problems, and the object of the present invention is to drastically improve attachment, removal work, maintenance work, etc. of a check valve cartridge and the like. At the same time, it is possible to hold the water meter flow axis at the proper position at the same time, and the entire water meter unit can be made compact, saving space and improving durability and economy. The object is to provide an excellent water meter unit.

In order to achieve the above object, according to a first aspect of the present invention, an upstream side first support mechanism and a downstream side second support mechanism are provided in a holding portion erected on both sides of a base body. In the water meter unit in which both ends of the water meter are held by the two support mechanisms, the second support mechanism on the downstream side includes a cylindrical member fixed to the holding portion, and a handle screwed to the cylindrical member. And a check valve cartridge that is detachably attached to the nut member and housed in the cylindrical member, and an outer end surface of the cylindrical member and an inner end surface formed on the nut member Are brought into contact with each other via an O-ring, and this contact position is a screwing end position when the nut member and the cylindrical member are screwed together, and the outer end of the nut member is downstream of the water meter. A circular arc-shaped receiving surface that supports the side connection end A groove portion is formed at the tip end portion of the receiving surface which is integrally extended with the rib protruding from the downstream bottom portion of the water meter, and the receiving surface is a threaded end of the nut member. A water meter which is held at a position below the nut member at the position and in a horizontal position, and further, a clamping surface for clamping one end surface of the water meter via a seal member is formed on the outer end surface of the nut member. Is a unit.

In the invention according to claim 2 , the cylindrical member is inserted into the mounting hole formed in the holding portion, and the flange portion provided on the primary side of the cylindrical member is locked to the mounting hole edge portion of the holding portion. This is a water meter unit in which a male screw part formed on the side is screwed with a fixing nut and a cylindrical member is fixed to a holding part .

According to the first aspect of the present invention, since there is no corroded portion such as a joint portion, the corrosion resistance is greatly improved, a meter unit having excellent piping strength is possible, and a receiving surface is provided integrally on the nut member. In addition, by integrally providing a groove portion that engages with a rib projecting from the downstream bottom portion of the water meter on the receiving surface, various functions of the second support mechanism can be exhibited by a single nut member. It is possible to significantly reduce manufacturing costs by reducing the number of parts and processing steps. That is, the single nut member provided in the second support mechanism makes it easy to attach and detach the check valve cartridge, and the nut member can be easily attached to and detached from the cylindrical member by operating the handle. At the end position, the receiving surface of the nut member can be properly held in a horizontal state, and not only can the one end of the water meter be supported by the receiving surface provided on the nut member, but also the water meter The water meter can be clamped and held in an appropriate state by the engagement state between the rib and the groove . Furthermore, since an effective gap space can be ensured between the water meter and the base body, for example, the entire water meter can be covered with a heat insulating material, and the entire meter unit is made compact. As a result, the space for installing the meter unit can be saved.

Removing the nuts member, can be extracted together also a check valve cartridge along with the nut member, it is possible to improve the workability.

Furthermore , when the nut member is screwed to the abutting surface of the cylindrical member, the receiving surface provided on the nut member is automatically placed at an appropriate position. Therefore, even if the nut member is removed for maintenance or the like, the screw is again screwed. When worn, the receiving surface can be reproduced at an appropriate position, and the water meter supported by this receiving surface is held in an appropriate state. It is possible to reliably match the flow path axis. In addition, the nut member, the check valve cartridge, and the like can be easily attached and detached even in places with poor work conditions such as dark places and narrow places, so that workability can be dramatically improved.

Also , when removing the nut member for maintenance work, attachment, removal work, etc., it can be manually attached and detached with the handle provided on the nut member without using a tool. It becomes possible to improve.

According to the second aspect of the present invention, it is possible to match the upstream and downstream flow path axes in the meter unit main body very easily and reliably.

An embodiment of a water meter unit according to the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing the structure of a water meter unit. As shown in the figure, a water meter unit 1 (hereinafter referred to as a meter unit 1) includes a base body 4 having a pair of holding portions 2 and 3 erected on both sides, and a pair of holding portions 2 and 3 The first support mechanism 5 on the upstream side, the second support mechanism 6 on the downstream side, and the like, which are mounted to face each other, and the first support mechanism 5 on the upstream side are fixed to the holding portion 2 in the present embodiment. An upstream cylindrical member 7 and an arcuate receiving surface 8 that is inserted in the upstream cylindrical member 7 and supports an upstream connection end (screw portion in this example) M1 of the water meter M. The slide member 9 is provided with a protruding member, and the rotary member 10 is moved forward and backward. In addition, the structure of said 1st support mechanism 5 is not limited to this example, What is necessary is just to be able to detachably hold water meter M in an appropriate state.

  The second support mechanism 6 on the downstream side is screwed onto the downstream side cylindrical member 11 fixed to the holding portion 3 and the meter side outer periphery of the downstream side cylindrical member 11, and is connected to the downstream side of the water meter M. A nut member 13 provided with an arc-shaped receiving surface 12 for supporting an end portion (screw portion in this example) M2 and the nut member 13 is screwed to be accommodated and held in the downstream cylindrical member 11. When the nut member 13 is screwed to the downstream tubular member 11, the outer end surface 11a of the downstream tubular member 11 and the inner end surface of the nut member 13 are configured. At the position where 13a abuts, both end positions are screwed, and the receiving surface 12 protruding from the nut member 13 is set at a position below the nut member 13 to connect the downstream side of the water meter M. It has a structure that supports the end M2 at an appropriate position. There. Further, the receiving surface 12 is formed with a groove 12a that engages with a rib M3 projecting from the bottom of the downstream side of the water meter M. In the figure, reference numeral 15 denotes a handle for manual operation provided on the outer peripheral surface of the nut member 13.

  FIG. 2 is a cross-sectional view taken along the line AA in FIG. As shown in the figure, the base body 4 has an elongated base portion 4a, is a hollow shape with a substantially trapezoidal cross section with an open bottom, and is stronger than a hollow shape with a rectangular cross section, The base body 4 has sufficient strength to withstand the reaction force when holding the water meter M while holding the water meter M while reducing the weight. The holding portions 2 and 3 are erected from the base portion 4a via a gentle phase portion, and the holding portions 2 and 3 are provided with attachment holes 2a and 3a. The periphery of the hole edges of the mounting holes 2a and 3a has a planar shape, and flange portions 7a and 11b, which will be described later, provided on the upstream side cylindrical member 7 and the downstream side cylindrical member 11, the upstream side cylindrical member 7 and the downstream side. Fixing nuts 16 and 17 used when the side cylindrical member 11 is fixed to the mounting holes 2a and 3a are in contact with the flat surface. Further, notches 4b and 4b are provided at both ends of the base body 4 so that bolts (not shown) for fixing the base body 4 to the floor or the like are locked. Of course, this fixing is not essential. In addition, the base body 4 of this example is made of ductile cast iron, and an epoxy resin powder coating (film thickness maximum of about 600 μm) is applied to the entire surface.

Here, the upstream first support mechanism shown as an example in the present embodiment will be described.
FIG. 3 is a cross-sectional view showing the structure of the first support mechanism 5. As shown in the figure, a flange portion 7a is provided on the outer periphery of the upstream cylindrical member 7, and when the upstream cylindrical member 7 is inserted into the mounting hole 2a of the holding portion 2 from the primary side, the flange portion 7a. Is engaged with the edge of the mounting hole of the holding portion 2. A male screw part (parallel male screw) 7b is formed on the outer periphery of the meter, and a fixing nut 16 for fixing the upstream cylindrical member 7 to the holding part 2 and an inner side of the upstream cylindrical member 7 are provided. A rotating member 10 for advancing and retracting the inserted slide member 9 is screwed.

  The slide member 9 includes a cylindrical portion 9 a inserted into the upstream cylindrical member 7 and an annular flange portion 9 b pressed by the rotating member 10, and the cylindrical portion 9 a is upstream of the O ring 18. The side cylindrical member 7 is in sliding contact with the inner peripheral surface. The annular flange portion 9b has a larger diameter than the male screw portion 7b formed on the outer periphery of the upstream cylindrical member 7, and the meter side end surface 9c has an outer side of the upstream connection end portion M1 of the water meter M. A sandwiching surface 9d corresponding to the diameter is formed in an inlay structure that is one step lower than the meter-side end surface 9c, and an O-ring 19 that seals against the water meter M is disposed on the sandwiching surface 9d. ing. Only the clamping surface 9d is cut, the meter-side end surface 9c is a cast surface or a forged surface, and the O-ring 19 may be in the form of another seal member as long as it is annular.

  An arc-shaped receiving surface 8 that supports the upstream connection end M1 of the water meter M is integrally provided at a position below the meter-side end surface 9c of the slide member 9. A guide groove 8a extending in the advancing / retreating direction of the slide member 9 is formed at the lowermost portion of the receiving surface 8, and a columnar protrusion 20 protruding from the upper surface of the base body 4 is engaged with the guide groove 8a. Thus, the slide member 9 is guided in the advancing / retreating direction while preventing the slide member 9 from rotating as the rotating member 10 rotates.

  On the inner periphery of the rotating member 10, a female screw portion 10 a that is screwed with a male screw portion 7 b formed on the outer periphery of the upstream cylindrical member 7 is formed. A stepped surface 10b is formed with the meter side larger than the female threaded portion 10a, and when the rotating member 10 is advanced, the stepped surface 10b is the back surface of the annular flange portion 9b of the slide member 9. Press. Further, the outer surface of the annular flange portion 9b of the slide member 9 is inscribed in the inner surface of the large-diameter portion of the rotating member 10, and the rotating member 10 can be rotated while being aligned by the slide member 9. Yes. A retaining ring 21 for locking the annular flange portion 9b of the slide member 9 is fitted to the inner periphery of the end portion on the meter side of the rotary member 10, and the slide member 9 is also rotated as the rotary member 10 rotates and retreats. I try to move them back together. Moreover, the outer peripheral surface of the rotating member 10 is provided with fin-shaped gripping portions 10c for manually operating the rotating member 10, and each gripping portion 10c has a through hole 10d. The through hole 10d and the hole 2b provided on the upper part of the holding part 2 can be fastened with a binding band or the like (not shown) to prevent inadvertent rotation of the rotating member 10, and a suitable clamping state of the water meter M Is surely maintained.

  In this example, as shown in FIG. 1 or FIG. 3, an elbow 22 bent at 90 degrees is extended to the upstream cylindrical member 7, and the upstream cylindrical member 7 is held by the holding portion 2. In order to be able to change the direction even if it is fixed to, a washer 23 made of an elastic member such as NBR is interposed between the holding portion 2 and the fixing nut 16, and the elastic force of the washer 23 Without removing the fixing nut 16, the direction of the elbow 22 can be freely changed under an appropriate frictional force. Moreover, as shown in FIG. 1, the union nut 24 is provided in the upstream edge part of the elbow 22, The state which adjusted the direction of the stop cock 25 shown in the figure, the pressure reducing valve which is not shown in figure, etc. appropriately I am trying to connect with. Thereby, the water stop cock 25, a connection tool, etc. can be provided as a unit. In the figure, reference numeral 26 denotes a pipe end anticorrosion core.

Next, the downstream second support mechanism will be described.
FIG. 4 is a cross-sectional view showing the structure of the second support mechanism 6. As shown in the figure, a flange portion 11b is provided on the outer periphery of the downstream cylindrical member 11, and when the downstream cylindrical member 11 is inserted into the mounting hole 3a of the holding portion 3 from the primary side, this flange portion 11 b is engaged with the edge of the mounting hole of the holding portion 3. A male screw part (parallel male screw) 11c is formed on the outer periphery of the secondary side, and a fixing nut 17 is screwed when the downstream cylindrical member 11 is fixed to the holding part 3. Further, a pipe internal thread part 11 d is formed on the inner periphery of the secondary side end part, and a downstream pipe can be connected via the pipe end anticorrosion core 26. The downstream cylindrical member 11 has a cylindrical portion 11e extending on the primary side, and a check valve cartridge 14 is accommodated in the cylindrical portion 11e. Further, a male screw portion 11f that is screwed with the female screw portion 13b of the nut member 13 is formed on the outer periphery of the cylindrical portion 11e, and the cylindrical portion 11e and the nut member 13 are connected to the meter side from the male screw portion 11f. An O-ring 27 for sealing is disposed.

As shown in FIG. 4, on the inner periphery of the nut member 13, there are a stepped surface 13c fitted to the end of the check valve cartridge 14 and an outer end surface 11a of the downstream tubular member 11 screwed. An inner end face 13a in contact therewith is provided. The check valve cartridge 14 is liquid-tightly fitted to the stepped surface 13c of the nut member 13 by utilizing the elastic force of an O-ring 28 disposed on the outer periphery of the valve seat 14a, and the downstream cylinder When the nut member 13 is removed from the cylindrical member 11, the check valve cartridge 14 can be taken out together with the nut member 13.

  On the meter-side end surface 13d of the nut member 13, a clamping surface 13e corresponding to the outer diameter of the downstream connection end M2 of the water meter M is formed in an inlay structure that is one step lower than the meter-side end surface 13d. In addition, an O-ring 29 that seals between the water meter M is disposed on the clamping surface 13e. Note that the clamping surface 13e is cut, the meter side end surface 13d is a cast surface or a forged surface, and the O-ring 29 may be in the form of another seal member as long as it is annular.

  On the meter-side end surface 13d of the nut member 13, an arcuate receiving surface 12 that supports the downstream connection end M2 of the water meter M is provided in a projecting manner. When the nut member 13 is screwed to the downstream cylindrical member 11, the position where the outer end surface 11a of the downstream cylindrical member 11 and the inner end surface 13a of the nut member 13 are in contact with each other is defined as a screwing end position. In addition, the receiving surface 12 protruding from the nut member 13 is set at a position below the nut member 13 which is a level, and the downstream connection end M2 of the water meter M is supported at an appropriate position. It has a structure. Accordingly, the nut member 13 and the downstream cylindrical member 11 are screwed together by a manual rotation operation using the handle 15, and the inner end surface 13a of the nut member 13 abuts against the outer end surface 11a of the downstream cylindrical member 11. When contacted, the receiving surface 12 at this position is reliably disposed at an appropriate position having a level, so that the level of the nut member 13 screwed to the downstream side tubular member 11 is reliably reproduced.

A groove portion 12 a that engages with a rib M < b > 3 protruding from the downstream bottom portion of the water meter M is formed at the tip portion 12 b of the receiving surface 12. The groove 12a is formed so as to be always engaged with the rib M3 of the water meter M, and the position of the water meter M between the first support mechanism 5 on the upstream side and the second support mechanism 6 on the downstream side. The rib M3 of the water meter M and the groove portion 12a are maintained in engagement with each other, and the water meter M is prevented from being tilted or rotated in the circumferential direction before holding the water meter M. Thus, the water meter M can be held under pressure in an appropriate state.

  FIG. 5 is a perspective view showing an example of the nut member 13. As shown in the figure, a handle 15 for attaching and detaching the nut member 13 and the downstream cylindrical member 11 by manual operation is provided on the outer peripheral surface of the nut member 13. In this example, the handle 15 is provided with gripping portions 15a radially every 90 ° in the upper, lower, left and right circumferential directions at an appropriate position having a level where the receiving surface 12 is the lowermost portion. By forming so as to cover the formation region of the female screw portion 13b formed on the peripheral surface, the nut member 13 is formed while minimizing the length C in the axial direction. The number, shape, and the like of the gripping portions 15a are arbitrary. Preferably, when the receiving surface 12 is disposed at an appropriate position having a level, at least one pair of gripping portions 15a having the level is provided at this position. Good. Thereby, for example, when the downstream cylindrical member 11 screwed with the nut member 13 is positioned and fixed to the holding portion 3, it can be arranged in an appropriate state while checking the level of the gripping portion 15a. The nut member 13 can be positioned at an appropriate position with respect to the circumferential direction. In this example, the downstream side tubular member 11 is positioned in the rotational direction at the appropriate position with respect to the holding part 3, and the fixing pin 30 is fitted into the pin hole 3 b provided in the upper part of the holding part 3. After being fixed in a non-rotatable manner, the fixing nut 17 is fixed in a state in which the positioning in the pipe axis direction is performed.

Next, the operation of the above embodiment will be described.
The connection ends M1 and M2 of the water meter M are placed on the receiving surfaces 8 and 12 of the first support mechanism 5 on the upstream side and the second support mechanism 6 on the downstream side, respectively. The flow path of the two support mechanism 6 and the flow path of the water meter M are positioned on the same axis, and the rib M3 of the water meter M is fitted into the groove 12a formed on the receiving surface 12 of the second support mechanism 6. The direction of the water meter M is confirmed and the water meter M is prevented from rotating or laterally shifting. At this time, since the receiving portions 8 and 12 that support the connection end portions M1 and M2 of the water meter M are formed in an arc shape, it is easy to place them. Further, the rotary member 10 of the first support mechanism 5 is manually operated via the handle 10c, and the slide member 9 is advanced. As a result, the water meter M is pressed downstream so that the water meter M is held between the holding surface 9d of the slide member 9 and the holding surface 13e of the nut member 13, and is attached to the holding surfaces 9d and 13e. With the O-rings 19 and 29, the clamping surfaces 9d and 13e and the upstream and downstream connection end surfaces of the water meter M are sealed in a liquid-tight manner, and the water meter M is connected to the meter unit main body 1. . Thereafter, the flow path to the water main is opened, and then the handle 25a of the stop cock 25 provided upstream of the first support mechanism 5 is rotated in an appropriate direction, and the ball 25b is rotated to connect the flow path.

  On the other hand, when removing the water meter M from the meter unit main body 1, the handle 25a of the stop cock 25 is rotated in an appropriate direction, the ball 25b is rotated to close the flow path, and the water main and the water meter M are closed. After closing the flow path between the two, the rotary member 10 of the first support mechanism 5 is rotated and the slide member 9 is moved backward to release the force holding the water meter M under pressure. The meter M can be detached.

  Further, when handling the nut member 13 and the check valve cartridge 14 of the second support mechanism 6 in maintenance work, replacement work, etc., even when the nut member 13 is removed from the downstream cylindrical member 11, the handle 15 When the nut member 13 and the downstream cylindrical member 11 are screwed together by a manual rotation operation using, and the inner end surface 13a of the nut member 13 comes into contact with the outer end surface 11a of the downstream cylindrical member 11, The levelness of the receiving surface at this position is reliably reproduced. In addition, when the receiving surface 12 is disposed at an appropriate position having levelness, at least one pair of gripping portions 15a having levelness at this position is provided on the outer peripheral surface of the nut member 13, so that the gripping surface 15a can be gripped during mounting work. Only by checking the level of the portion 15a, it is possible to check whether proper attachment has been performed. Accordingly, the nut member 13, the check valve cartridge 14 and the like can be easily attached and detached even in a place with poor working conditions such as a dark place and a narrow place, and placed on the receiving portion 12 in which the levelness is reproduced. The water meter M can hold the axial center at an appropriate position, and can reliably match the flow paths of the first support mechanism 5 and the second support mechanism 6 with the flow path of the water meter M. .

  FIG. 6 is a front view showing a state in which the water meter M is covered with the heat insulating material 31. As shown in the figure, when the meter unit 1 is used in an area called a semi-cold region, a heat insulating material 31 is inserted from a widely secured gap portion, and the water meter M is covered with the heat insulating material 31. Thus, freezing can be easily prevented, and the entire periphery of the meter unit 1 can be covered with the heat insulating material 31.

It is sectional drawing which showed the structure of the meter unit for water supplies in this invention. It is the sectional view on the AA line in FIG. It is sectional drawing which showed the structure of the 1st support mechanism of an upstream. It is sectional drawing which showed the structure of the 2nd support mechanism of the downstream. It is the perspective view which showed an example of the nut member. It is sectional drawing which showed the state which covered the water meter with the heat insulating material.

Explanation of symbols

1 Water meter unit (meter unit body)
2, 3 Holding portion 3a Mounting hole 4 Base body 5 First support mechanism 6 Second support mechanism 11 Downstream cylindrical member 11a Outer end surface 12 Receiving surface 13 Nut member 13a Inner end surface 14 Check valve cartridge 15 Handle 17 Fixed nut 29 O-ring M Water meter M1 Upstream connection end M2 Downstream connection end M3 Rib

Claims (2)

For the water supply, the first support mechanism on the upstream side and the second support mechanism on the downstream side are provided in the holding portions that are erected on both sides of the base body, and both ends of the water meter are held by the first and second support mechanisms. In the meter unit, the second support mechanism on the downstream side is detachably attached to the cylindrical member fixed to the holding portion, a nut member having a handle screwed to the cylindrical member, and the nut member . And a check valve cartridge housed in the cylindrical member , wherein an outer end surface of the cylindrical member and an inner end surface formed on the nut member are brought into contact with each other via an O-ring, and the contact position is An arcuate receiving surface that supports the downstream connection end of the water meter is integrated with the outer end of the nut member as a screwing end position when the nut member and the cylindrical member are screwed together. Protruding, and this receiving surface is extended to the tip part A groove for engaging a rib projecting from the downstream bottom of the road meter is formed, and this receiving surface is held at a position below the nut member and at a horizontal position at the time of the screwing end position of the nut member. Furthermore, the water meter unit is characterized in that a clamping surface for clamping one end surface of the water meter via a seal member is formed on the outer end surface of the nut member . A cylindrical member is inserted into the mounting hole formed in the holding portion, the flange portion provided on the primary side of the cylindrical member is locked to the mounting hole edge of the holding portion, and the male screw portion formed on the secondary side is The water meter unit according to claim 1, wherein a tubular member is fixed to the holding portion by screwing with a fixing nut .

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