A DMA boundary closure valve

Abstract

This utility model discloses a DMA boundary sealing valve, belonging to the field of water supply valves. The DMA boundary sealing valve of this utility model is installed on the inlet pipe of a DMA zone boundary. It includes a valve body and a valve core assembly disposed within the valve body. The valve body has a first bypass hole communicating with the inlet and a second bypass hole communicating with the outlet. The first and second bypass holes are connected by a small-diameter bypass pipe, which is equipped with a small-diameter flow meter. This utility model uses a small-diameter bypass pipe on the valve body to connect the inlet and outlet. After the boundary sealing valve is closed, the small-diameter bypass pipe maintains a low flow rate in the pipeline, preventing stagnant water and water quality problems. Simultaneously, the small-diameter flow meter measures the flow rate in the bypass pipe, monitoring minute flow changes and preventing blind spots caused by the complete closure of a valve in one pipeline. This also helps locate hidden leaks within the DMA zone and reduces leakage.

Description

Technical Field

[0001] This utility model relates to a water supply pipeline valve, and more specifically, to a DMA boundary sealing valve. Background Technology

[0002] The rapid pace of urbanization has led to the dense laying of water supply pipelines, but it has also brought about increasingly prominent problems such as aging pipeline networks and leakage. DMA (District Metering Area) is a pipeline network management method that divides the complex water supply network into several relatively independent monitoring zones and installs flow meters at the inlet and outlet of each zone to monitor the inflow and outflow of each zone in real time, thereby achieving accurate monitoring of water flow in each zone. The core purpose of this method is to control leakage, easily pinpoint potential leakage locations, and then take proactive measures to control leakage in the water supply network.

[0003] When dividing DMA (Diverterless Water Supply) zones, the number of flow meters is generally minimized to reduce management costs. Therefore, some boundary valves are appropriately closed without affecting the water supply safety of the DMA zone to reduce unnecessary flow meter installation. However, after the boundary valves are closed, the stagnant water flow at the end of the DMA network can lead to water quality deterioration (such as turbidity, yellowing, blackening, and foul odor), forming "dead water." To address this issue, the "Smart Water Management DMA Leakage Analysis System" (published on April 10, 2020), published in Chinese Patent Publication No. CN110991942A, mentions in its specification, in the section on "Ensuring Water Quality During Water Transmission and Distribution," that during DMA implementation, maintenance and management of valves can be carried out simultaneously, thereby actively and scientifically managing valves, fire hydrants, and other network ancillary structures. In actual operation, methods such as regularly flushing fire hydrants and rinsing pipes can be used to reduce "dead water." During the design, commissioning, and operation of the DMA, water quality can be analyzed through sampling, providing a reference for water supply companies to effectively manage network water quality. While these methods can reduce stagnant water and ensure water quality to some extent, they require regular water drainage and pipe flushing, increasing the workload of pipe maintenance and failing to fundamentally solve the aforementioned "stagnant water" problem. Summary of the Invention

[0004] 1. Technical problem to be solved by the utility model

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings of the existing technology and provide a DMA boundary sealing valve. The technical solution of this invention involves setting a small-diameter bypass pipe connecting the inlet and outlet on the valve body of the boundary sealing valve. After the boundary sealing valve is closed, the low flow rate in the pipeline is maintained through the small-diameter bypass pipe, preventing stagnant water from causing water quality problems. Simultaneously, a small-diameter flow meter is used to measure the flow rate in the bypass pipe, monitoring minute flow changes and preventing metering blind spots caused by the complete closure of a valve in one pipeline. This also helps to locate hidden leaks within the DMA zone and reduce leakage.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] This utility model discloses a DMA boundary sealing valve, which is installed on the inlet pipe of the DMA zone boundary. It includes a valve body and a valve core assembly disposed in the valve body. The valve body is provided with a first bypass hole communicating with the inlet and a second bypass hole communicating with the outlet. The first bypass hole and the second bypass hole are connected by a small-diameter bypass pipe, and a small-diameter flow meter is provided on the small-diameter bypass pipe.

[0009] Furthermore, the small-diameter bypass pipe is equipped with regulating valves at both the inlet and outlet ends of the small-diameter flow meter.

[0010] Furthermore, the flow velocity inside the small-diameter bypass pipe is controlled to be greater than or equal to 0.2 m / s.

[0011] Furthermore, the flow rate of the small-diameter bypass pipe is controlled between 0.1 and 0.5 m³ / s. 3 / h.

[0012] Furthermore, the diameter of the small-diameter bypass pipe is DN20 to DN40.

[0013] Furthermore, a pressure gauge and / or water quality monitor are also installed on the small-diameter bypass pipe via a tee fitting.

[0014] Furthermore, the small-diameter flow meter is an NB-IoT Internet of Things wireless remote water meter.

[0015] Furthermore, the DMA boundary sealing valve is installed inside the boundary valve well, and the small-diameter bypass pipe is formed by a series of pipe fittings sealed together, with the dial of the small-diameter flow meter facing the wellhead of the boundary valve well.

[0016] Furthermore, the DMA boundary closure valve is a soft-seal gate valve.

[0017] Furthermore, the valve core assembly includes a valve core, a valve stem, and a handwheel. The valve body is provided with a valve cover. The valve stem rotates and seals with the valve cover. The handwheel is fixedly connected to the outer end of the valve stem. The inner end of the valve stem is coaxially provided with a transmission screw. The valve core slides along the valve stem axially within the valve body and is located between the inlet and outlet. The valve core is provided with a transmission nut that is threadedly engaged with the transmission screw. The handwheel controls the rotation of the valve stem, which in turn moves the valve core within the valve body to control the opening and closing of the inlet and outlet and the degree of opening.

[0018] 3. Beneficial effects

[0019] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0020] (1) A DMA boundary sealing valve of this utility model is installed on the inlet pipe of the DMA zone boundary. It includes a valve body and a valve core assembly disposed in the valve body. The valve body is provided with a first bypass hole connected to the inlet and a second bypass hole connected to the outlet. The first bypass hole and the second bypass hole are connected by a small-diameter bypass pipe. A small-diameter flow meter is provided on the small-diameter bypass pipe. After the boundary sealing valve is closed, the low flow rate in the pipe is maintained through the small-diameter bypass pipe to avoid stagnant water in the pipe and water quality problems. At the same time, the flow rate in the bypass pipe is measured by the small-diameter flow meter to monitor small flow rate changes and avoid the metering blind zone caused by the complete closure of a valve in a certain pipeline. It also helps to locate hidden leaks in the DMA zone and reduce leakage.

[0021] (2) The DMA boundary sealing valve of this utility model has regulating valves on the small diameter bypass pipe at the inlet and outlet of the small diameter flow meter, which facilitates the adjustment of the flow velocity and flow rate in the bypass pipe.

[0022] (3) The DMA boundary sealing valve of this utility model has a flow velocity in a small-diameter bypass pipe that is controlled to be greater than or equal to 0.2m / s, which can prevent the bypass pipe from being blocked due to the deposition of suspended matter.

[0023] (4) The DMA boundary sealing valve of this utility model has a flow rate controlled in the small-diameter bypass pipe of 0.1 to 0.5 m³ / h. 3 / h,

[0024] (5) The DMA boundary sealing valve of this utility model has a small diameter bypass pipe with a diameter of DN20~DN40, which can be equipped with a small diameter flow meter. The installation cost is much lower than that of a large diameter water meter, and the cost of single-point modification is low.

[0025] (6) The DMA boundary sealing valve of this utility model can also be equipped with a pressure gauge and / or water quality monitor through a three-way pipe joint on its small diameter bypass pipe, which can monitor water pressure and water quality and upload them in real time to ensure the stability of pipeline operation and water quality compliance.

[0026] (7) The DMA boundary sealing valve of this utility model has a small-diameter flow meter that is an NB-IoT Internet of Things wireless remote water meter with high metering accuracy. It can upload flow data in real time, monitor the flow change in the bypass pipe online, assist in leakage monitoring and location, and realize the integration and linkage of the boundary sealing valve status and bypass flow data, which helps to realize automatic leakage early warning.

[0027] (8) A DMA boundary sealing valve of this utility model is installed in the boundary valve well. The small diameter bypass pipe is made of several pipe fittings sealed together, and the dial of the small diameter flow meter faces the wellhead of the boundary valve well. It can replace the original gate valve in the existing valve well without dismantling or building a well, and the modification is convenient. In addition, the overall structure is compact, and the orientation of the dial of the small diameter flow meter can be flexibly adjusted by changing the shape of the bypass pipe, which facilitates the data reading and calibration operation of the flow meter.

[0028] (9) The DMA boundary sealing valve of this utility model adopts a soft-seal gate valve, which has the advantages of high sealing performance, reliable closure, not easy to rust and long service life, and can ensure the safety of tap water quality. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a DMA boundary sealing valve according to the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0031] Figure 3 This is a schematic diagram of the valve body in a DMA boundary sealing valve according to the present invention;

[0032] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0033] Figure 5 This is a layout diagram of a bypass pipe in a DMA boundary closure valve according to the present invention;

[0034] Figure 6 for Figure 5 Schematic diagram of the structure in the CC direction;

[0035] Figure 7 This is an alternative layout diagram of the bypass pipe in a DMA boundary closure valve according to this utility model.

[0036] Explanation of the labels in the diagram:

[0037] 1. Valve body; 1-1. Inlet; 1-1a. First bypass hole; 1-2. Outlet; 1-2a. Second bypass hole; 2. Valve core; 2-1. Transmission nut; 3. Valve cover; 3-1. Seal; 4. Valve stem; 4-1. Transmission screw; 5. Handwheel; 6. Small-diameter bypass pipe; 6-1. Pipe fitting; 7. Regulating valve; 8. Small-diameter flow meter. Detailed Implementation

[0038] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0039] [Example]

[0040] This embodiment describes a DMA boundary shut-off valve, installed on the DMA zone boundary inlet pipe. Its main purpose is to isolate a specific closable inlet pipe of the DMA zone by closing the boundary shut-off valve, reducing the cost of installing a large-diameter performance gauge (flow meter) on that pipe. Combined with... Figures 1 to 4 As shown, the DMA boundary closure valve includes a valve body 1 and a valve core assembly disposed within the valve body 1. The valve core assembly is used to control the opening and closing of the inlet and outlet of the valve body 1. The structure of the valve core assembly is determined by different structural forms of boundary closure valves. Unlike existing boundary valves, in this embodiment, the valve body 1 is provided with a first bypass hole 1-1a communicating with the inlet 1-1 and a second bypass hole 1-2a communicating with the outlet 1-2. Both the first bypass hole 1-1a and the second bypass hole 1-2a can be disposed on the side wall of the valve body 1. The first bypass hole 1-1a and the second bypass hole 1-2a are connected by a small-diameter bypass pipe 6, and a small-diameter flow meter 8 is disposed on the small-diameter bypass pipe 6. The diameter of the small-diameter bypass pipe 6 is relative to the diameter of the inlet and outlet of the valve body 1, and the diameter of the bypass pipe is smaller than the diameter of the inlet and outlet of the valve body 1. The diameter of the small-diameter flow meter 8 is adapted to the diameter of the small-diameter bypass pipe 6. In existing technologies, after the boundary valve is closed, a dead water zone is created in the terminal pipe of the DMA network due to stagnant water flow. The DMA boundary sealing valve in this embodiment solves this problem. After the boundary sealing valve is closed, a low flow rate is maintained in the pipeline through a small-diameter bypass pipe 6, avoiding the formation of dead water in the pipeline and causing water quality problems. At the same time, the flow rate in the bypass pipe is measured by a small-diameter flow meter 8, which can monitor minute flow rate changes and avoid metering blind spots caused by the complete closure of a valve in a certain pipeline. This also helps to locate hidden leaks in the DMA zone and reduce leakage.

[0041] Reference Figure 1As shown, to facilitate flow regulation within the bypass pipe, regulating valves 7 are installed at both the inlet and outlet ends of the small-diameter flow meter 8 on the small-diameter bypass pipe 6. These regulating valves 7 can be ball valves, such as those made of brass, to easily regulate the flow velocity and flow rate within the bypass pipe. In this embodiment, the flow velocity within the small-diameter bypass pipe 6 is preferably controlled to be greater than or equal to 0.2 m / s to prevent blockage caused by suspended solids deposition. Furthermore, the flow rate of the small-diameter bypass pipe 6 is preferably controlled between 0.1 and 0.5 m³ / s. 3 / h can maintain a low flow rate in the bypass pipe at night, effectively preventing water quality deterioration at the end of the water supply.

[0042] In this embodiment, the diameter of the small-diameter bypass pipe 6 is preferably DN20 to DN40, and the material must be corrosion-resistant and hard, such as stainless steel or steel-plastic composite pipe. The small-diameter bypass pipe can be equipped with a small-diameter flow meter 8, and the installation cost is much lower than that of a large-diameter water meter, resulting in low cost for single-point modification.

[0043] In addition, a pressure gauge and / or water quality monitor can be installed on the small-diameter bypass pipe 6 via a tee fitting. The pressure gauge can monitor the pressure inside the bypass pipe to prevent high-pressure impact on the flow meter. The water quality monitor can monitor residual chlorine, pH value, and turbidity, etc. Of course, other monitoring equipment can also be installed to monitor water pressure and water quality and upload the data in real time, ensuring the stability of the pipeline network and that the water quality meets standards. The aforementioned small-diameter flow meter 8 is preferably an NB-IoT wireless remote water meter. The NB-IoT wireless remote water meter is an existing product with high metering accuracy and the ability to upload flow data in real time. It can monitor changes in flow in the bypass pipe online, assisting in leakage monitoring and location. Furthermore, it can integrate and link the status of the boundary closed valve with the bypass flow data, which will help to realize automatic leakage early warning in the future.

[0044] In this embodiment, the DMA boundary sealing valve is installed inside the boundary valve well. The small-diameter bypass pipe 6 is formed by sealing and connecting several pipe fittings 6-1, and the dial face of the small-diameter flow meter 8 faces the wellhead of the boundary valve well. It can replace the original gate valve in the existing valve well without dismantling or building a well, which is convenient and saves costs. Moreover, the overall structure is compact, and the orientation of the dial face of the small-diameter flow meter can be flexibly adjusted by changing the shape of the bypass pipe, which facilitates the data reading and calibration operation of the flow meter. Figure 5 and Figure 6 The diagram shows the installation method where the valve core operating axis of the DMA boundary closed valve is perpendicular to the ground. In order to make the dial face of the small diameter flow meter 8 face upward, the small diameter bypass pipe 6 has a horizontal pipe connected to the corresponding bypass hole. The two horizontal pipes are connected by a vertically extending connecting pipe through fittings such as elbows. The small diameter flow meter 8 is installed on the top of the small diameter bypass pipe 6. Figure 7The diagram shows the installation configuration of the DMA boundary closure valve with its valve core operating axis parallel to the ground. In this configuration, the first bypass hole 1-1a and the second bypass hole 1-2a on the valve body 1 face upwards. The small-diameter bypass pipe 6 can be installed in the vertical plane, and the small-diameter flow meter 8 is also installed on top of the small-diameter bypass pipe 6. The fittings 6-1 that make up the small-diameter bypass pipe 6 mainly include elbows, internal and external threaded joints, and short pipes. The bypass pipe can be flexibly assembled according to the installation method of the boundary closure valve to minimize the impact on the boundary valve well.

[0045] Specifically, in this embodiment, the DMA boundary closure valve is a soft-seal gate valve with a sealing class ≥ ANSI Class VI. It possesses advantages such as high sealing performance, reliable closure, resistance to rust, and long service life, ensuring the safety of tap water quality. See details below. Figure 1 and Figure 2 As shown, the valve core assembly of the soft-seal gate valve includes a valve core 2, a valve stem 4, and a handwheel 5. A valve cover 3 is provided on the valve body 1. The valve stem 4 rotates and seals with the valve cover 3. A dustproof ring and an O-ring, etc., can be installed between the valve cover 3 and the valve stem 4. The handwheel 5 is fixedly connected to the outer end of the valve stem 4. A transmission screw 4-1 is coaxially provided on the inner end of the valve stem 4. The valve core 2 slides axially within the valve body 1 along the valve stem 4 and is located between the inlet 1-1 and the outlet 1-2. A transmission nut 2-1 is provided on the valve core 2, which is threadedly engaged with the transmission screw 4-1. The handwheel 5 controls the rotation of the valve stem 4, causing the valve core 2 to move within the valve body 1, thereby controlling the opening and closing of the inlet 1-1 and the outlet 1-2, as well as their opening degree. Other structures of the soft-seal gate valve are similar to existing technologies and will not be described further here. Of course, the DMA boundary closure valve can also adopt other existing valve structure forms. Any other type of valve that can be used as a DMA boundary valve can be modified using the above bypass design.

[0046] This utility model discloses a boundary sealing valve for DMA (Diverterless Damage Control) systems. A small-diameter bypass pipe is installed on the valve body to connect the inlet and outlet. After the boundary sealing valve is closed, the small-diameter bypass pipe maintains a low flow rate within the pipeline, preventing stagnant water and water quality issues. Simultaneously, a small-diameter flow meter measures the flow rate within the bypass pipe, monitoring minute flow changes and preventing metering blind spots caused by the complete closure of a valve in one pipeline. This also helps locate hidden leaks within the DMA zone, reducing leakage.

[0047] Specifically, the DMA boundary sealing valve of this utility model has the advantages of low cost, significant water-saving benefits and high long-term value. It can effectively solve the water quality problem in the sealed area while ensuring independent metering accuracy, eliminate the cost of installing large-diameter meters, utilize the original valve well to save costs, and the old valves that are replaced can be reused. It is suitable for scenarios such as residential community pipe network sealing, old pipe network renovation, high-rise building water supply and industrial parks.

[0048] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A DMA boundary sealing valve, installed on the inlet pipe of a DMA zone boundary, comprising a valve body (1) and a valve core assembly disposed within the valve body (1), characterized in that: The valve body (1) is provided with a first bypass hole (1-1a) connected to the inlet (1-1) and a second bypass hole (1-2a) connected to the outlet (1-2). The first bypass hole (1-1a) and the second bypass hole (1-2a) are connected by a small-diameter bypass pipe (6). A small-diameter flow meter (8) is provided on the small-diameter bypass pipe (6).

2. The DMA boundary sealing valve according to claim 1, characterized in that: The small-diameter bypass pipe (6) is equipped with regulating valves (7) at both the inlet and outlet ends of the small-diameter flow meter (8).

3. The DMA boundary sealing valve according to claim 2, characterized in that: The flow velocity inside the small-diameter bypass pipe (6) is controlled to be greater than or equal to 0.2 m / s.

4. The DMA boundary sealing valve according to claim 3, characterized in that: The flow rate of the small-diameter bypass pipe (6) is controlled between 0.1 and 0.5 m. 3 / h.

5. The DMA boundary sealing valve according to claim 3, characterized in that: The diameter of the small-diameter bypass pipe (6) is DN20 to DN40.

6. The DMA boundary sealing valve according to claim 2, characterized in that: The small-diameter bypass pipe (6) is also equipped with a pressure gauge and / or a water quality monitor via a tee fitting.

7. The DMA boundary sealing valve according to claim 1, characterized in that: The small-diameter flow meter (8) is an NB-IoT Internet of Things wireless remote water meter.

8. The DMA boundary sealing valve according to claim 1, characterized in that: The DMA boundary sealing valve is installed inside the boundary valve well. The small-diameter bypass pipe (6) is formed by sealing and connecting several pipe fittings (6-1) and the dial of the small-diameter flow meter (8) faces the wellhead of the boundary valve well.

9. The DMA boundary sealing valve according to any one of claims 1 to 8, characterized in that: The DMA boundary closure valve is a soft-seal gate valve.

10. The DMA boundary sealing valve according to claim 9, characterized in that: The valve core assembly includes a valve core (2), a valve stem (4), and a handwheel (5). A valve cover (3) is provided on the valve body (1). The valve stem (4) rotates and seals with the valve cover (3). The handwheel (5) is fixedly connected to the outer end of the valve stem (4). A transmission screw (4-1) is coaxially provided on the inner end of the valve stem (4). The valve core (2) slides along the axial direction of the valve stem (4) in the valve body (1) and is located between the inlet (1-1) and the outlet (1-2). A transmission nut (2-1) is provided on the valve core (2) and threadedly engaged with the transmission screw (4-1). The valve core (2) is controlled by the handwheel (5) to rotate the valve stem (4) and drive the valve core (2) to move in the valve body (1) to control the opening and closing of the inlet (1-1) and the outlet (1-2) and the opening degree.

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