Flow meter and water distributor

Abstract

The present invention claims a flow meter and a water distributor. The flow meter includes a housing, a valve core rod, and a measuring rod. The housing has a first inlet and a second inlet. The valve core rod has a connecting channel and is rotatably mounted inside the housing to control the opening / closing of the connecting channel with the first and second inlets under the action of the valve core rod. The measuring rod is axially slidably mounted inside the valve core rod. The measuring rod has a force-bearing ring disposed within the connecting channel. The medium introduced into the connecting channel can act on the force-bearing ring to drive the measuring rod to slide axially relative to the valve core rod and measure the flow rate of the medium passing through the connecting channel. The flow meter of the present invention only requires the rotation of the valve core rod to be turned on, which is not only simple to operate, but also the height of the valve core rod does not change. This makes the use of the flow meter unaffected by the installation space of the flow meter, thereby improving the application range of the flow meter.

Description

Technical Field

[0001] This invention belongs to the technical field of flow control, and in particular relates to a flow meter and a water distributor. Background Technology

[0002] A manifold, also known as a distributor or collector, is a water distribution and collection device used in water systems to connect the supply and return water of various heating pipes. In underfloor heating systems, the manifold is primarily responsible for opening and closing the water flow in the underfloor heating loop. Water from the gas boiler flows through the main pipe into the filter to isolate impurities, and then the water is evenly distributed into the loop through the manifold branches. After heat exchange, the water returns to the main collection pipe and then flows back into the heating system through the return outlet.

[0003] Flow meters are typically installed on different main water pipes of a distributor, allowing circulating water in the main pipes to flow into the branch circulation pipes through flow meter regulation. The flow meter not only regulates and monitors the flow rate in each branch circulation pipe but also controls the opening and closing of each circulation pipe. Currently, existing flow meters used in distributors employ a spiral upward and downward adjustment method. Furthermore, fully opening the flow meter usually requires rotating the valve core 3-4 times, which is not only cumbersome but also requires sufficient space during installation to accommodate the valve core's height adjustment during operation, thus limiting the application environment of the flow meter. Summary of the Invention

[0004] In view of this, it is necessary to provide a flow meter and water distributor to solve the above-mentioned technical problems.

[0005] A flow meter, used in a water distributor, characterized in that the flow meter comprises:

[0006] A housing, wherein a first inlet and a second inlet are provided on the housing;

[0007] A valve core main rod, on which a connecting channel is formed, is rotatably mounted within the housing to control the opening / closing of the connecting channel with the first inlet and the second inlet under the action of the valve core main rod; and

[0008] A measuring rod is axially slidably mounted inside the valve core main rod. The measuring rod is provided with a force-bearing ring, which is disposed in the connecting channel. The medium introduced into the connecting channel can act on the force-bearing ring to drive the measuring rod to slide axially relative to the valve core main rod and measure the flow rate of the medium passing through the connecting channel.

[0009] In this application, the valve core rod is rotatably installed inside the housing, and the medium introduced into the connecting channel on the valve core rod drives the measuring rod to slide axially relative to the valve core rod. This allows the flow meter to be turned on simply by driving the valve core rod to rotate, which is not only easy to operate, but also ensures that the height of the valve core rod does not change when the flow meter is turned on. This makes the use of the flow meter unaffected by the installation space, thereby improving the application range of the flow meter.

[0010] In one embodiment, the valve core main rod has a first connecting hole and a second connecting hole on its rod wall, the first connecting hole being matched with the first inlet and the second connecting hole being matched with the second inlet;

[0011] The first inlet is connected to the connection channel through the first connection hole, and the second inlet is connected to the connection channel through the second connection hole.

[0012] It is understandable that the connection between the connecting channel and the first and second inlets is specifically achieved through the structural arrangement of the first and second connecting holes on the valve core main rod.

[0013] In one embodiment, the valve core main rod is provided with a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being disposed between the valve core main rod and the housing, wherein the first sealing ring and the first connecting hole are arranged at intervals along the circumference of the valve core main rod, and the second sealing ring and the second connecting hole are arranged at intervals along the circumference of the valve core main rod.

[0014] The first sealing ring and the second sealing ring can be deformed under pressure to simultaneously seal the corresponding first inlet and second inlet.

[0015] It is understandable that the structure of the first and second sealing rings is designed to meet the flow control requirements between the first and second inlets when the flow meter is in operation, by controlling the rotation angle of the valve core rod.

[0016] In one embodiment, the flow meter further includes a positioning element, and an arc-shaped groove is provided on the valve core main rod, the arc-shaped groove being correspondingly provided with the positioning element;

[0017] The positioning element passes through the housing and extends into the corresponding arc-shaped groove to axially limit the valve core rod to the housing.

[0018] It is understandable that the rotational connection between the valve core main rod and the housing is achieved through the structural design of the positioning component and the cooperation between the positioning component and the arc groove.

[0019] In one embodiment, the first inlet and / or the second inlet are configured as an elliptical structure.

[0020] It is understandable that setting the first inlet and / or the second inlet to an elliptical structure, compared to a circular inlet, results in a larger diameter for the elliptical first inlet and / or the second inlet. This can prevent sand particles or dirt mixed in with the medium from clogging the first inlet and / or the second inlet.

[0021] In one embodiment, the flow meter further includes a third sealing ring and a fourth sealing ring, which are disposed between the valve core main rod and the housing, and located on the outer sides of the first inlet and the second inlet, for sealing the valve core main rod and the housing during assembly.

[0022] It is understandable that the assembly sealing between the valve core main rod and the housing is specifically achieved through the structural arrangement of the first and fourth sealing rings.

[0023] In one embodiment, the force-bearing ring has a force-bearing surface, the plane of which is in the same direction as the radial direction of the measuring rod.

[0024] It is understandable that by setting the plane direction of the force-bearing surface on the force-bearing ring to be the same as the radial direction of the measuring rod, the contact area between the force-bearing ring and the medium introduced into the connecting channel can be increased, so that the medium can push the measuring rod to move axially through the force-bearing ring.

[0025] In one embodiment, the measuring rod is further provided with an indicator ring, and the measuring rod can drive the indicator ring to move axially relative to the valve core main rod;

[0026] The measuring rod is also fitted with an elastic element, the two ends of which abut against the indicator ring and the valve core rod, respectively, to drive the measuring rod to elastically reset.

[0027] It is understandable that, through the above-mentioned structure of the elastic element, the elasticity of the measuring rod can be elastically reset by utilizing the structural characteristics of the elastic element, so as to meet the needs of the flow meter for repeated flow adjustment.

[0028] In one embodiment, the flow meter further includes a metering cover, which is fitted onto the measuring rod and connected and fixed to the valve core main rod;

[0029] The metering cover is marked with a flow rate scale, which can cooperate with the indicator ring to reflect the flow rate of the medium.

[0030] Understandably, fitting the metering cover onto the measuring rod and connecting it to the valve core rod prevents external dust from entering the flow meter, thus ensuring its normal operation. Simultaneously, the flow scale on the metering cover engages with the indicator ring to obtain the flow rate value of the medium passing through the flow meter.

[0031] This application also claims protection for a water distributor, including a water distributor body and a flow meter as described in any of the above claims, wherein the water distributor body has a water distribution main pipe, the water distribution main pipe is correspondingly provided with the flow meter, and the flow meter is installed on the corresponding water distribution main pipe.

[0032] In this application, the flow meter structure facilitates the adjustment of the flow rate during the operation of the main body of the water distributor, and does not require additional space due to the lack of flow meter adjustment, thereby improving the application range of the water distributor.

[0033] Due to the application of the above technical solution, this application has the following beneficial effects compared with the prior art:

[0034] The flow meter and distributor claimed in this application have a valve core rod rotatably mounted inside the housing. The measuring rod is driven to slide axially relative to the valve core rod by the medium introduced into the connecting channel on the valve core rod. This allows the flow meter to be turned on simply by driving the valve core rod to rotate, which is not only easy to operate, but also ensures that the height of the valve core rod does not change when the flow meter is turned on. This makes the use of the flow meter unaffected by the installation space, thereby improving the application range of the flow meter. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a flow meter provided in an embodiment of this application;

[0037] Figure 2 This is a cross-sectional view of a flow meter provided in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the shell structure in this application;

[0039] Figure 4 This is a schematic diagram of the valve core main rod in this application;

[0040] Figure 5This is a schematic diagram of the measuring rod in this application.

[0041] Reference numerals: 100, flow meter; 10, housing; 11, first inlet; 12, second inlet; 13, positioning element; 131, positioning pin; 14, threaded connection; 20, valve core main rod; 201, rod wall; 21, connecting channel; 22, arc groove; 23, first connecting hole; 24, second connecting hole; 30, measuring rod; 31, force ring; 311, force surface; 32, indicating ring; 33, elastic element; 40, metering cover; 41, flow scale; 50, metering cover outer sleeve; 101, first sealing ring; 102, second sealing ring; 103, third sealing ring; 104, fourth sealing ring; 105, fifth sealing ring; 106, sixth sealing ring. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that when a component is said to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or may have an intervening component.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] The flow meter 100 claimed in this application is used in a water distributor to collect water; specifically, the water distributor is used in a floor heating water system.

[0046] The water distributor includes a water distributor body and a flow meter 100. The water distributor body has a water distribution main pipe, and the water distribution main pipe is correspondingly set with the flow meter 100, and the flow meter 100 is installed on the corresponding water distribution main pipe.

[0047] like Figure 1 , Figure 2 As shown, a flow meter 100 provided in one embodiment of this application includes a housing 10, a valve core main rod 20, and a measuring rod 30. The housing 10 has a first inlet 11 and a second inlet 12. The valve core main rod 20 has a connecting channel 21. The valve core main rod 20 is rotatably mounted inside the housing 10 to control the connection / disconnection between the connecting channel 21 and the first inlet 11 and the second inlet 12 under the drive of the valve core main rod 20. The measuring rod 30 is axially slidably mounted inside the valve core main rod 20. The measuring rod 30 has a force-bearing ring 31, which is disposed within the connecting channel 21. The medium introduced into the connecting channel 21 can act on the force-bearing ring 31 to drive the measuring rod 30 to slide axially relative to the valve core main rod 20, and to measure the flow rate of the medium passing through the connecting channel 21. It should be noted that the medium in the connecting channel 21 of the valve core main rod 20 is specifically introduced through the first inlet 11 and the second inlet 12 of the housing 10.

[0048] It is understood that the flow meter 100 of this application, through the reasonable structural arrangement of the housing 10, valve core main rod 20 and measuring rod 30, enables the flow meter 100 to be turned on simply by driving the valve core main rod 20 to rotate. The pressure generated by the medium introduced into the connecting channel 21 on the force ring 31 is used to make the measuring rod 30 move axially relative to the valve core main rod 20, thereby achieving the purpose of measuring the medium flow rate. It is not only easy to operate, but also the height of the valve core main rod 20 does not change when the flow meter 100 is turned on. This allows the use of the flow meter 100 to be unaffected by the flow meter installation space, thereby improving the application range of the flow meter 100.

[0049] The valve core main rod 20 extends outward relative to the housing 10, so that when the flow meter 100 is turned on, a person can act on the part of the valve core main rod 20 that extends out of the housing 10, so as to rotate the valve core main rod 20 relative to the housing 10, which facilitates the operation of the flow meter 100.

[0050] like Figure 3 As shown, the first inlet 11 and / or the second inlet 12 are configured with an elliptical structure. Preferably, both the first inlet 11 and the second inlet 12 are configured with an elliptical structure. Compared with a circular inlet, the elliptical first inlet 11 and / or the second inlet 12 have a larger diameter, which can prevent sand particles or dirt mixed in the medium from clogging the first inlet 11 and / or the second inlet 12. It should be noted that the shape of the first inlet 11 and / or the second inlet 12 is not limited to that shown in the figure. Those skilled in the art can configure the first inlet 11 and / or the second inlet 12 with other irregular shapes, which will not be elaborated here.

[0051] like Figure 2As shown, the flow meter 100 also includes a positioning element 13. An arc-shaped groove 22 is formed on the valve core main rod 20, and the arc-shaped groove 22 is correspondingly arranged with the positioning element 13. The positioning element 13 passes through the housing 10 and extends into the corresponding arc-shaped groove 22 to axially limit the valve core main rod 20 to the housing 10, thereby specifically realizing the rotational connection between the valve core main rod 20 and the housing 10. It should be noted that the positioning element 13 is preferably set as a positioning pin 131, which can be threaded into the housing 10 to limit the positioning pin 131 to the housing 10.

[0052] In one embodiment, there are two positioning members 13, and there are also two corresponding arc-shaped grooves 22 on the valve core main rod 20. The part of the positioning member 13 that passes through the housing 10 can extend into the corresponding arc-shaped groove 22, which can further improve the stability of the assembly between the housing 10 and the valve core main rod 20.

[0053] like Figure 1 , Figure 2 As shown, the housing 10 is also provided with a threaded connection part 14, and the flow meter 100 is specifically installed to the main water distribution pipe of the water distributor (not shown) by means of the threaded connection part 14 on the housing 10. Of course, in order to ensure the sealing of the flow meter 100 on the main water distribution pipe, a fifth sealing ring 105 can be fitted on the threaded connection part 14 to seal the housing 10 and the main water distribution pipe.

[0054] like Figure 4 As shown, the valve core main rod 20 has a first connecting hole 23 and a second connecting hole 24 on its rod wall 201. The first connecting hole 23 is matched with the first inlet 11, and the second connecting hole 24 is matched with the second inlet 12. The first inlet 11 is connected to the connecting channel 21 through the first connecting hole 23, and the second inlet 12 is connected to the connecting channel 21 through the second connecting hole 24, thereby realizing the connection between the connecting channel 21 and the first inlet 11 and the second inlet 12. It should be noted that the first connecting hole 23 being matched with the first inlet 11 and the second connecting hole 24 being matched with the second inlet 12 specifically means that the first connecting hole 23 and the first inlet 11, and the second connecting hole 24 and the second inlet 12, are set to have the same shape and size.

[0055] like Figure 2As shown, the valve core main rod 20 is provided with a first sealing ring 101 and a second sealing ring 102. The first sealing ring 101 and the second sealing ring 102 are disposed between the valve core main rod 20 and the housing 10. The first sealing ring 101 and the first connecting hole 23 are arranged at intervals along the circumference of the valve core main rod 20, and the second sealing ring 102 and the second connecting hole 24 are arranged at intervals along the circumference of the valve core main rod 20. Moreover, the first sealing ring 101 and the second sealing ring 102 can be deformed under pressure to simultaneously block the corresponding first inlet 11 and second inlet 12. When the flow meter 100 is working, the valve core main rod 20 rotates relative to the housing 10. The valve core main rod 20 can drive the first sealing ring 101 and the second sealing ring 102 to disengage from the corresponding first inlet 11 and the corresponding second inlet 12. By using different rotation angles of the valve core main rod 20, the overlapping area between the first inlet 11 and the first connecting hole 23, and between the second inlet 12 and the second connecting hole 24 can be controlled, thereby achieving the purpose of adjusting the flow rate of the medium introduced by the first inlet 11 and the second inlet 12.

[0056] It should be noted that the first sealing ring 101 and the second sealing ring 102 are partially embedded in the rod wall 201 of the valve core main rod 20, so that when the valve core main rod 20 rotates relative to the housing 10, the valve core main rod 20 can simultaneously drive the first sealing ring 101 and the second sealing ring 102 to rotate relative to the housing 10.

[0057] like Figure 2 As shown, the flow meter 100 also includes a third sealing ring 103 and a fourth sealing ring 104. The third sealing ring 103 and the fourth sealing ring 104 are disposed between the valve core main rod 20 and the housing 10, and are located on the outer sides of the first inlet 11 and the second inlet 12, for sealing the assembly of the valve core main rod 20 and the housing 10. It should be noted that, to ensure the sealing performance during assembly between the valve core main rod 20 and the housing 10, the number of third sealing rings 103 and fourth sealing rings 104 can be set to multiple according to the application requirements; this will not be elaborated upon here.

[0058] like Figure 2 , Figure 5 As shown, the force-receiving ring 31 has a force-receiving surface 311, the plane direction of which is the same as the radial direction of the measuring rod 30. This increases the contact area between the force-receiving ring 31 and the medium introduced into the connecting channel 21, so that the medium can push the measuring rod 30 axially through the force-receiving ring 31. It should be noted that the outer diameter of the force-receiving ring 31 is smaller than the inner diameter of the connecting channel 21, so that the measuring rod 30 can move axially within the connecting channel 21 under the drive of the force-receiving ring 31, and the medium introduced by the first inlet 11 and the second inlet 12 can be discharged outward from the connecting channel 21, that is, the flow meter 100 achieves the function of collecting flow in the water distributor.

[0059] The force-bearing ring 31 and the measuring rod 30 are connected as one unit to facilitate the production and manufacturing of the measuring rod 30.

[0060] In one embodiment, the measuring rod 30 is further provided with an indicator ring 32, which can drive the indicator ring 32 to move axially relative to the valve core main rod 20. An elastic element 33 is also fitted onto the measuring rod 30, with its two ends abutting against the indicator ring 32 and the valve core main rod 20 respectively, to drive the measuring rod 30 to elastically reset, thus meeting the flow meter 100's requirement for repeated flow adjustment. That is, when the flow meter 100 is turned on and the medium is circulated, the medium needs to overcome the resistance of the elastic element 33 and drive the measuring rod 30 to move axially. The resistance that the measuring rod 30 needs to overcome during movement corresponds one-to-one with the flow rate of the medium passing through the connecting channel 21. It should be noted that the elastic element 33 is specifically set as a spring; however, those skilled in the art can also use other flexible elements such as bellows or rubber sleeves.

[0061] like Figure 1 As shown, the flow meter 100 also includes a metering cover 40, which is fitted onto the measuring rod 30 and fixedly connected to the valve core main rod 20. The metering cover 40 is marked with a flow rate scale 41, which engages with the indicator ring 32 to indicate the flow rate of the medium. That is, when the measuring rod 30 moves the indicator ring 32 to one of the positions on the flow rate scale 41 on the metering cover 40, the reading at that position is the flow rate of the medium passing through the connecting channel 21. It should be noted that the metering cover 40 is made transparent to allow for easy reading of the value of the flow rate scale 41 corresponding to the indicator ring 32.

[0062] It is understood that when the flow meter 100 of this application is working, the measuring rod 30 always moves within the metering cover 40 and the valve core main rod 20, and achieves overall sealing of the flow meter 100. This can prevent external dust from entering the flow meter 100, thereby ensuring the normal use of the flow meter 100.

[0063] like Figure 2 As shown, the metering cover 40 and the valve core main rod 20 are connected and fixed by threads to facilitate the installation of the metering cover 40 onto the valve core main rod 20; and in order to improve the sealing performance of the assembly between the metering cover 40 and the valve core main rod 20, a sixth sealing ring 106 can be provided between the valve core main rod 20 and the metering cover 40.

[0064] Furthermore, the flow meter 100 also includes a metering cover sleeve 50, which is fitted onto the metering cover 40 to protect the metering cover 40.

[0065] In summary, the flow meter 100 for which this application seeks protection can adjust the flow rate by rotating the valve core main rod 20, so as to facilitate the control of the flow meter 100. During this process, the height of the valve core main rod 20 of the flow meter 100 will not change, so the use of the flow meter 100 is not affected by the installation space of the flow meter 100, thereby improving the application range of the flow meter 100.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and variations made to the above embodiments within the essential spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A flow meter used in a water distributor, characterized in that, The flow meter (100) includes: The housing (10) has a first inlet (11) and a second inlet (12). A valve core main rod (20) is provided with a connecting channel (21). The valve core main rod (20) is rotatably installed inside the housing (10) to control the opening / closing of the connecting channel (21) with the first inlet (11) and the second inlet (12) under the drive of the valve core main rod (20); and A measuring rod (30) is axially slidably installed inside the valve core main rod (20). The measuring rod (30) is provided with a force ring (31), which is located in the connecting channel (21). The medium introduced into the connecting channel (21) can act on the force ring (31) to drive the measuring rod (30) to slide axially relative to the valve core main rod (20) and measure the flow rate of the medium when it passes through the connecting channel (21). The valve core main rod (20) has a first connecting hole (23) and a second connecting hole (24) on its rod wall (201). The first connecting hole (23) is matched with the first inlet (11), and the second connecting hole (24) is matched with the second inlet (12). The first inlet (11) is connected to the connecting channel (21) through the first connecting hole (23), and the second inlet (12) is connected to the connecting channel (21) through the second connecting hole (24).

2. The flow meter according to claim 1, characterized in that, The valve core main rod (20) is provided with a first sealing ring (101) and a second sealing ring (102). The first sealing ring (101) and the second sealing ring (102) are disposed between the valve core main rod (20) and the housing (10). The first sealing ring (101) and the first connecting hole (23) are arranged at intervals along the circumference of the valve core main rod (20), and the second sealing ring (102) and the second connecting hole (24) are arranged at intervals along the circumference of the valve core main rod (20). The first sealing ring (101) and the second sealing ring (102) can be deformed under pressure to simultaneously block the corresponding first inlet (11) and second inlet (12).

3. The flow meter according to claim 1, characterized in that, The flow meter (100) also includes a positioning element (13), and an arc-shaped groove (22) is provided on the valve core main rod (20), and the arc-shaped groove (22) is correspondingly provided with the positioning element (13); The positioning element (13) passes through the housing (10) and extends into the corresponding arc groove (22) to axially limit the valve core rod (20) to the housing (10).

4. The flow meter according to claim 1, characterized in that, The first inlet (11) and / or the second inlet (12) are configured as elliptical structures.

5. The flow meter according to claim 1, characterized in that, The flow meter (100) also includes a third sealing ring (103) and a fourth sealing ring (104). The third sealing ring (103) and the fourth sealing ring (104) are disposed between the valve core main rod (20) and the housing (10) and are located on the two outer sides of the first inlet (11) and the second inlet (12) to seal the valve core main rod (20) and the housing (10).

6. The flow meter according to claim 1, characterized in that, The force ring (31) has a force-bearing surface (311), and the plane direction of the force-bearing surface (311) is the same as the radial direction of the measuring rod (30).

7. The flow meter according to claim 1, characterized in that, The measuring rod (30) is also provided with an indicator ring (32), and the measuring rod (30) can drive the indicator ring (32) to move axially relative to the valve core main rod (20); The measuring rod (30) is also fitted with an elastic element (33), the two ends of which abut against the indicator ring (32) and the valve core main rod (20) respectively, so as to drive the measuring rod (30) to elastically reset.

8. The flow meter according to claim 7, characterized in that, The flow meter (100) also includes a metering cover (40), which is fitted onto the measuring rod (30) and connected and fixed to the valve core main rod (20); The metering cover (40) is marked with a flow rate scale (41), which can cooperate with the indicator ring (32) to reflect the flow rate of the medium.

9. A water distributor, characterized in that, The device includes a water distributor body and a flow meter (100) as described in any one of claims 1-8. The water distributor body has a water distribution main pipe, which is correspondingly arranged with the flow meter (100), and the flow meter (100) is installed on the corresponding water distribution main pipe.

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