Pressure-stabilizing operation water supply system based on skiing field type water system

Abstract

The utility model discloses a pressure stabilizing operation water supply system based on a ski field type water system, which comprises a water supply pool, a water supply pump set and a water supply pipeline which are sequentially connected, the water supply pipeline comprises a main pipe, a branch pipe and a water drain pipe, and the branch pipe and the water drain pipe are respectively connected to the tail end of the main pipe. A drain opening of the pressure release valve group is connected with the water supply tank through a water return pipeline; the feed pump set comprises a fixed-frequency water pump and a variable-frequency water pump; and the pressure release valve group comprises at least two pressure holding and fixing valves. The constant-frequency water pump water supply system is suitable for modification of the constant-frequency water pump water supply system, a small number of variable-frequency water pumps and pressure release valve sets are added, the problems of water pump overheating, system overpressure and water pump surging of a traditional constant-frequency water pump water supply system are solved, and safe and stable operation of the system is guaranteed; meanwhile, the problem that all water supply pumps need to be provided with frequency converters is solved, and system investment cost is effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of water supply and drainage engineering technology, and relates to a pressure-stabilized water supply system based on a ski resort-type water system. Background Technology

[0002] With the widespread adoption of winter sports, various regions are developing rural winter tourism and promoting the construction of ski resorts and similar sports facilities. Existing ski resort projects typically use branched pipe networks for their water supply systems, with terminal water pressure requirements ranging from 25mH2O to 50mH2O. Current system designs generally employ high-flow, high-lift variable frequency pumps equipped with frequency converters, leading to excessively high project investment.

[0003] Given a fixed investment amount, the ski resort's water supply system uses fixed-frequency water pumps. Due to the large variation in water consumption at the end, generally from 10 m³ / h to the design full load condition (several hundred m³ / h), the system's pipeline network will experience "overpressure" problems and the water pump will "overheat" under low flow conditions at the end.

[0004] Operating at low flow rates causes the pump body temperature to rise, resulting in minimal useful work being done by the pump. Most of the shaft power is converted into heat energy, which is transferred to the liquid inside the pump, causing the entire casing to heat up. During long-term operation at low flow rates, a phenomenon known as "surge" will occur, characterized by regular, periodic changes in flow rate and pump outlet pressure. Surge produces vibration and noise, negatively impacting the pump. Utility Model Content

[0005] The purpose of this invention is to provide a pressure-stabilized water supply system based on a ski resort-type water system, which solves the problem of overpressure and pressure buildup in the pipeline network of the existing fixed-frequency water pump system.

[0006] The technical solution adopted in this utility model is a pressure-stabilized water supply system based on a ski resort-type water system, including a water supply tank, a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe and branch pipes and a drain pipe respectively connected to the end of the main pipe. The other end of the drain pipe is connected to a pressure relief valve group. The drain port of the pressure relief valve group is connected to the water supply tank through a return water pipe. The water supply pump group includes a fixed-frequency water pump and a variable-frequency water pump. The pressure relief valve group includes at least two pressure-holding and pressure-stabilizing valves.

[0007] The features of this utility model also include:

[0008] The number of variable frequency water pumps shall not exceed the number of fixed frequency water pumps, and the number of variable frequency water pumps shall be 1 to 3.

[0009] There are two pressure sustaining and regulating valves, namely the first pressure sustaining and regulating valve and the second pressure sustaining and regulating valve.

[0010] The operating pressure of the first pressure-holding and regulating valve is set to 1.2 times the working pressure of the water supply pipeline.

[0011] The operating pressure of the second pressure-holding valve is set to 1.5 times the working pressure of the water supply pipeline.

[0012] The return water pipeline includes a first return water pipe and a second return water pipe, which are respectively connected to the drain ports of the first pressure-holding valve and the second pressure-holding valve.

[0013] A butterfly valve is installed on the drain pipe.

[0014] The pressure-holding and constant-pressure valve is a spring-loaded, low-pressure safety valve.

[0015] The beneficial effects of this utility model are:

[0016] This utility model is applicable to the renovation of water supply systems using fixed-frequency water pumps. By adding a small number of pressure-regulating water pumps and pressure relief valve groups, it eliminates the problems of water pump overheating, system "overpressure", and water pump "surging" in traditional fixed-frequency water pump water supply systems, ensuring the safe and stable operation of the system. At the same time, it solves the problem that all water supply pumps need to be equipped with frequency converters, effectively reducing system investment costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the constant pressure water supply system based on a ski resort-like water system, which is a structural diagram of the present invention.

[0018] In the diagram, 1. First pressure-holding and constant pressure valve, 2. Second pressure-holding and constant pressure valve, 3. First return water pipe, 4. Second return water pipe, 5. Water supply tank, 6. Variable frequency water pump, 7. Fixed frequency water pump, 8. Main pipe, 9. Branch pipe, 10. Drain pipe. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, the present invention relates to a pressure-stabilized water supply system based on a ski resort-type water system, comprising a water supply tank 5, a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe 8 and branch pipes 9 and drain pipes 10 connected to the ends of the main pipe 8, respectively. The other end of the drain pipe 10 is connected to a pressure relief valve group, and the drain outlet of the pressure relief valve group is connected to the water supply tank 5 through a return water pipeline. The water supply pump group includes a fixed-frequency water pump 7 and a variable-frequency water pump 6. The pressure relief valve group includes at least two pressure-holding and pressure-stabilizing valves.

[0021] The number of variable frequency water pumps 6 is no greater than the number of fixed frequency water pumps 7, and the number of variable frequency water pumps 6 is 1 to 3.

[0022] The water supply pump set provides power to the water supply system. When fixed-frequency pumps account for a large proportion of the water supply pump set, the cost of installing multiple fixed-frequency pumps with a small number of variable-frequency pumps is much lower than that of installing all variable-frequency pumps. Furthermore, because fixed-frequency pumps have fewer components, they offer higher stability and reliability in harsh environments, are easier to maintain, and have strong resistance to electromagnetic interference. The overall water supply volume of the water supply system can be adjusted slightly by using variable-frequency pumps to reduce pipeline pressure.

[0023] Each water pump in the water supply pump set is equipped with a rubber expansion joint, a slow-closing check valve, and a gate valve between itself and the water supply pipeline.

[0024] The main pipe in a water supply system is the pipe that undertakes the main water delivery task, and its diameter is generally large. Branch pipes are pipes that branch off from the main pipe, with relatively smaller diameters, and their main function is to distribute the water delivered from the main pipe to various specific water-using points. In this utility model, the main water supply pipe is the main pipe in the water supply system that delivers water from the water supply tank 5 to various branch pipes or water-taking areas. Installing a pressure relief valve assembly at the end of the main pipe can effectively solve the overpressure problem before the branching, ensuring the safety of subsequent branch pipes.

[0025] The test pressure of the pipeline network is generally 1.5 times the design pressure. Therefore, at least two pressure sustaining and stabilizing valves should be set. One pressure stabilizing valve is set to release pressure less than 1.5 times the design pressure to ensure safety. The other pressure sustaining and stabilizing valves are used to release overpressure to prevent the pipeline network from continuing to be over-pressurized when the pressure relief is insufficient, even exceeding the test pressure. They can also ensure normal pressure relief valves can function properly in case of failure.

[0026] Therefore, the multiple pressure-holding and pressure-regulating valves in the pressure relief valve group are set with different pressure relief values ​​according to the design pressure of the water supply system, so as to carry out graded protection of the water supply network, and enable each pressure-holding and pressure-regulating valve to open and close respectively under different operating stages or working conditions, and effectively regulate the pipeline pressure.

[0027] There are two pressure sustaining and regulating valves, namely the first pressure sustaining and regulating valve 1 and the second pressure sustaining and regulating valve 2. The operating pressure of the first pressure sustaining and regulating valve 1 is set to 1.2 times the working pressure of the water supply pipeline; the operating pressure of the second pressure sustaining and regulating valve 2 is set to 1.5 times the working pressure of the water supply pipeline.

[0028] The return water pipeline includes a first return water pipe 3 and a second return water pipe 4, which are respectively connected to the drain ports of two pressure-holding and pressure-regulating valves.

[0029] A butterfly valve is installed on the drain pipe 10. The butterfly valve remains open when the pressure sustaining and regulating valve is working normally. If the pressure sustaining and regulating valve needs maintenance or replacement, the butterfly valve is temporarily closed for maintenance or replacement.

[0030] The pressure-holding and constant-pressure valve is a spring-loaded, low-pressure safety valve.

[0031] This utility model is mainly applied to special water supply systems such as ski resorts where the terminal flow rate is unstable, the system head requirement is high, and the system is relatively small. Based on the modification of the system, it ensures the stable operation of the fixed frequency water pump water supply system, avoids the occurrence of system "overpressure" and water pump "surging", significantly reduces project investment, and improves the operational stability of the water supply system.

[0032] The working principle of the pressure-stabilized water supply system based on the water system of a ski resort is as follows:

[0033] During the water supply process in the pipeline network, power is provided to several fixed-frequency water pumps in the water pump group. Under low flow conditions at the end of the water supply pipeline, if the system is over-pressured, the variable frequency water pump 6 is used to adjust the pump speed first, thereby adjusting the water supply and reducing the pipeline network pressure.

[0034] However, the variable frequency water pump 6 has a limited adjustment range. If the pipeline continues to be over-pressurized to more than 1.2 times the design pressure of the pipeline, the first pressure holding and regulating valve 1 will open and discharge water to the water supply tank 5 through the return water pipe 3; if the system pressure returns to the design pressure, the pressure holding and regulating valve 1 will close.

[0035] If the pipeline pressure still cannot be reduced and exceeds 1.5 times the design pressure, the pressure holding and regulating valve 2 will open, and water will be discharged to the water supply tank 5 through the return water pipe 4. At this time, the pressure holding and regulating valve 1 and the pressure holding and regulating valve 2 will open simultaneously, and water will be discharged to the water supply tank 5 through the return water pipe, thereby maximizing the regulation of the pressure at the end of the pipeline.

[0036] When the system pressure drops to within 1.5 times the design pressure, the first pressure-holding and regulating valve 1 closes; when the system pressure drops to below 1.2 times the design pressure, the pressure-holding and regulating valve 1 closes.

[0037] As the water supply system changes with the water consumption at the end of the water supply pipeline and the pressure of the water supply network system, the integrated variable frequency water pump 6, the first pressure holding and stabilizing valve 1, and the second pressure holding and stabilizing valve 2 are adjusted and started according to the pressure to maintain the normal system pressure.

[0038] This invention can also be applied to the renovation of existing water supply pump sets that are all fixed-frequency pumps. A few of the fixed-frequency pumps in the water supply pump set are equipped with frequency converters or inverters, making the water supply pump set meet the requirements of this application. Several pressure-holding and pressure-regulating valves are also installed at the end of the main water supply pipeline. This simple and conveniently solves the problem of "pressure buildup" in the water supply pipeline caused by the use of all fixed-frequency pumps in early projects.

[0039] Example 1

[0040] This embodiment is based on a pressure-stabilized water supply system for ski resort-type water systems, including a water supply tank 5, a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe 8 and branch pipes 9 and drain pipes 10 connected to the ends of the main pipe 8, respectively. The other end of the drain pipe 10 is connected to a pressure relief valve group, and the drain outlet of the pressure relief valve group is connected to the water supply tank 5 through a return water pipeline. The water supply pump group includes a fixed-frequency water pump 7 and a variable-frequency water pump 6. The pressure relief valve group includes at least two pressure-holding and pressure-stabilizing valves.

[0041] Its working principle is as follows:

[0042] During the water supply process in the pipeline network, several fixed-frequency pumps in the water supply pump group provide the main power. Under the condition of low flow at the end, if the system overpressure occurs in the water supply pipeline, the variable frequency pump 6 is used to adjust the pump speed and adjust the water supply to reduce the pipeline pressure. If the pipeline continues to be overpressured and exceeds the pressure relief pressure value set by the pressure holding and regulating valve, the pressure holding and regulating valve opens and water is discharged to the water supply tank 5 through the return water pipeline. When the system pressure returns to the design pressure, the pressure holding and regulating valve closes.

[0043] Example 2

[0044] This embodiment is based on a pressure-stabilized water supply system for ski resort-type water systems, including a water supply tank 5, a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe 8 and branch pipes 9 and drain pipes 10 connected to the ends of the main pipe 8, respectively. The other end of the drain pipe 10 is connected to a pressure relief valve group, and the drain outlet of the pressure relief valve group is connected to the water supply tank 5 through a return water pipeline. The water supply pump group includes a fixed-frequency water pump 7 and a variable-frequency water pump 6. The pressure relief valve group includes at least two pressure-holding and pressure-stabilizing valves.

[0045] Variable frequency water pump 6 is a fixed frequency water pump with a variable frequency cabinet or variable frequency drive installed. This transformation is a substantially identical replacement solution.

[0046] Both variable frequency (VFD) water pumps and fixed frequency (VFD) water pumps can adjust the motor speed by changing the power supply frequency, thereby controlling parameters such as flow rate and pressure. They are essentially the same. In new construction projects, VFD water pump 6 and VFD water pump 7 can be directly combined into a water supply pump set to reduce construction costs. In the renovation of old projects, VFDs or VFD cabinets can be added to the existing VFD water pumps to improve the overall safety and water supply effect of the water supply system at a lower cost.

[0047] Its working principle is as follows:

[0048] During the water supply process in the pipeline network, several fixed-frequency pumps in the water supply pump group provide the main power. Under the condition of low flow at the end, if the system overpressure occurs in the water supply pipeline, the variable frequency pump 6 is used to adjust the pump speed and adjust the water supply to reduce the pipeline pressure. If the pipeline continues to be overpressured and exceeds the pressure relief pressure value set by the pressure holding and regulating valve, the pressure holding and regulating valve opens and water is discharged to the water supply tank 5 through the return water pipeline. When the system pressure returns to the design pressure, the pressure holding and regulating valve closes.

[0049] Example 3

[0050] This embodiment is based on a pressure-stabilized water supply system for ski resort-type water systems, including a water supply tank 5, a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe 8 and branch pipes 9 and drain pipes 10 connected to the ends of the main pipe 8, respectively. The other end of the drain pipe 10 is connected to a pressure relief valve group, and the drain outlet of the pressure relief valve group is connected to the water supply tank 5 through a return water pipeline. The water supply pump group includes a fixed-frequency water pump 7 and a variable-frequency water pump 6. The pressure relief valve group includes at least two pressure-holding and pressure-stabilizing valves.

[0051] There are two pressure sustaining and regulating valves: a first pressure sustaining and regulating valve 1 and a second pressure sustaining and regulating valve 2. The first pressure sustaining and regulating valve 1 is set to 1.2 times the working pressure of the water supply network; the second pressure sustaining and regulating valve 2 is set to 1.5 times the working pressure of the water supply network.

[0052] Its working principle is as follows:

[0053] During the water supply process in the pipeline network, power is provided to several fixed-frequency water pumps in the water pump group. Under low flow conditions at the end of the water supply pipeline, if the system is over-pressured, the variable frequency water pump 6 is used to adjust the pump speed first, thereby adjusting the water supply and reducing the pipeline network pressure.

[0054] However, the variable frequency water pump 6 has a limited adjustment range. If the pipeline continues to be over-pressurized to more than 1.2 times the design pressure of the pipeline, the first pressure holding and regulating valve 1 will open and discharge water to the water supply tank 5 through the return water pipe 3; if the system pressure returns to the design pressure, the pressure holding and regulating valve 1 will close.

[0055] If the pipeline pressure still cannot be reduced and exceeds 1.5 times the design pressure, the pressure holding and regulating valve 2 will open, and water will be discharged to the water supply tank 5 through the return water pipe 4. At this time, the pressure holding and regulating valve 1 and the pressure holding and regulating valve 2 will open simultaneously, and water will be discharged to the water supply tank 5 through the return water pipe, thereby maximizing the regulation of the pressure at the end of the pipeline.

[0056] When the system pressure drops to within 1.5 times the design pressure, the first pressure-holding and regulating valve 1 closes; when the system pressure drops to below 1.2 times the design pressure, the pressure-holding and regulating valve 1 closes.

[0057] Example 4

[0058] This embodiment is based on a pressure-stabilized water supply system for ski resort-type water systems, including a water supply tank 5, a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe 8 and branch pipes 9 and drain pipes 10 connected to the ends of the main pipe 8, respectively. The other end of the drain pipe 10 is connected to a pressure relief valve group, and the drain outlet of the pressure relief valve group is connected to the water supply tank 5 through a return water pipeline. The water supply pump group includes a fixed-frequency water pump 7 and a variable-frequency water pump 6. The pressure relief valve group includes at least two pressure-holding and pressure-stabilizing valves.

[0059] The water supply pump set consists of one variable frequency pump (6) and two fixed frequency pumps (7).

[0060] There are two pressure sustaining and regulating valves: a first pressure sustaining and regulating valve 1 and a second pressure sustaining and regulating valve 2. The first pressure sustaining and regulating valve 1 is set to 1.2 times the working pressure of the water supply network; the second pressure sustaining and regulating valve 2 is set to 1.5 times the working pressure of the water supply network.

[0061] Its working principle is as follows:

[0062] During the water supply process in the pipeline network, power is provided to several fixed-frequency water pumps in the water pump group. Under low flow conditions at the end of the water supply pipeline, if the system is over-pressured, the variable frequency water pump 6 is used to adjust the pump speed first, thereby adjusting the water supply and reducing the pipeline network pressure.

[0063] However, the variable frequency water pump 6 has a limited adjustment range. If the pipeline continues to be over-pressurized to more than 1.2 times the design pressure of the pipeline, the first pressure holding and regulating valve 1 will open and discharge water to the water supply tank 5 through the return water pipe 3; if the system pressure returns to the design pressure, the pressure holding and regulating valve 1 will close.

[0064] If the pipeline pressure still cannot be reduced and exceeds 1.5 times the design pressure, the pressure holding and regulating valve 2 will open, and water will be discharged to the water supply tank 5 through the return water pipe 4. At this time, the pressure holding and regulating valve 1 and the pressure holding and regulating valve 2 will open simultaneously, and water will be discharged to the water supply tank 5 through the return water pipe, thereby maximizing the regulation of the pressure at the end of the pipeline.

[0065] When the system pressure drops to within 1.5 times the design pressure, the first pressure-holding and regulating valve 1 closes; when the system pressure drops to below 1.2 times the design pressure, the pressure-holding and regulating valve 1 closes.

[0066] Example 5

[0067] This embodiment is based on a pressure-stabilized water supply system for ski resort-type water systems, including a water supply tank 5, a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe 8 and branch pipes 9 and drain pipes 10 connected to the ends of the main pipe 8, respectively. The other end of the drain pipe 10 is connected to a pressure relief valve group, and the drain outlet of the pressure relief valve group is connected to the water supply tank 5 through a return water pipeline. The water supply pump group includes a fixed-frequency water pump 7 and a variable-frequency water pump 6. The pressure relief valve group includes at least two pressure-holding and pressure-stabilizing valves.

[0068] The water supply pump set consists of 2 variable frequency pumps (6) and 5 fixed frequency pumps (7).

[0069] There are two pressure sustaining and regulating valves: a first pressure sustaining and regulating valve 1 and a second pressure sustaining and regulating valve 2. The first pressure sustaining and regulating valve 1 is set to 1.2 times the working pressure of the water supply network; the second pressure sustaining and regulating valve 2 is set to 1.5 times the working pressure of the water supply network.

[0070] Its working principle is as follows:

[0071] During the water supply process in the pipeline network, power is provided to several fixed-frequency water pumps in the pump group. Under low flow conditions at the end of the water supply pipeline, if the system is over-pressured, the pump speed is adjusted by one variable-frequency water pump to regulate the water supply and reduce the pipeline network pressure. If the adjustment capacity is insufficient, two variable-frequency water pumps are used for adjustment at the same time.

[0072] However, the variable frequency water pump 6 has a limited adjustment range. If the pipeline continues to be over-pressurized to more than 1.2 times the design pressure of the pipeline, the first pressure holding and regulating valve 1 will open and discharge water to the water supply tank 5 through the return water pipe 3; if the system pressure returns to the design pressure, the pressure holding and regulating valve 1 will close.

[0073] If the pipeline pressure still cannot be reduced and exceeds 1.5 times the design pressure, the pressure holding and regulating valve 2 will open, and water will be discharged to the water supply tank 5 through the return water pipe 4. At this time, the pressure holding and regulating valve 1 and the pressure holding and regulating valve 2 will open simultaneously, and water will be discharged to the water supply tank 5 through the return water pipe, thereby maximizing the regulation of the pressure at the end of the pipeline.

[0074] When the system pressure drops to within 1.5 times the design pressure, the first pressure-holding and regulating valve 1 closes; when the system pressure drops to below 1.2 times the design pressure, the pressure-holding and regulating valve 1 closes.

[0075] Example 6

[0076] This embodiment is based on a pressure-stabilized water supply system for ski resort-type water systems, including a water supply tank 5, a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe 8 and branch pipes 9 and drain pipes 10 connected to the ends of the main pipe 8, respectively. The other end of the drain pipe 10 is connected to a pressure relief valve group, and the drain outlet of the pressure relief valve group is connected to the water supply tank 5 through a return water pipeline. The water supply pump group includes a fixed-frequency water pump 7 and a variable-frequency water pump 6. The pressure relief valve group includes at least two pressure-holding and pressure-stabilizing valves.

[0077] The water supply pump set consists of one variable frequency pump (6) and two fixed frequency pumps (7).

[0078] There are three pressure-holding and pressure-regulating valves, which are set to 1.5 times, 1.3 times, and 1.2 times the working pressure of the water supply network, respectively.

[0079] Its working principle is as follows:

[0080] During the water supply process in the pipeline network, power is provided to several fixed-frequency water pumps in the water pump group. Under low flow conditions at the end of the water supply pipeline, if the system is over-pressured, the variable frequency water pump 6 is used to adjust the pump speed first, thereby adjusting the water supply and reducing the pipeline network pressure.

[0081] However, the variable frequency water pump 6 has a limited adjustment range. If the pipeline continues to be over-pressurized to 1.2 times, 1.3 times and 1.5 times the design pressure of the pipeline, the corresponding pressure holding and regulating valve will open and drain water to the water supply tank 5 to gradually restore the system to the normal pressure value.

Claims

1. A pressure-stabilized water supply system based on a ski resort-type water system, characterized in that, The system includes a water supply tank (5), a water supply pump group, and a water supply pipeline connected in sequence. The water supply pipeline includes a main pipe (8) and branch pipes (9) and drain pipes (10) connected to the ends of the main pipe (8), respectively. The other end of the drain pipe (10) is connected to a pressure relief valve group. The drain outlet of the pressure relief valve group is connected to the water supply tank (5) through a return water pipeline. The water supply pump group includes a fixed frequency water pump (7) and a variable frequency water pump (6). The pressure relief valve group includes at least two pressure-holding and pressure-regulating valves.

2. The pressure-stabilized water supply system based on a ski resort-type water system according to claim 1, characterized in that, The number of variable frequency water pumps (6) is no greater than the number of fixed frequency water pumps (7), and the number of variable frequency water pumps (6) is 1 to 3.

3. The pressure-stabilized water supply system based on a ski resort-type water system according to claim 1, characterized in that, There are two pressure-holding and pressure-regulating valves, namely the first pressure-holding and pressure-regulating valve (1) and the second pressure-holding and pressure-regulating valve (2).

4. The pressure-stabilized water supply system based on a ski resort-type water system according to claim 3, characterized in that, The operating pressure of the first pressure-holding and pressure-regulating valve (1) is set to 1.2 times the working pressure of the water supply pipeline.

5. The pressure-stabilized water supply system based on a ski resort-type water system according to claim 3, characterized in that, The operating pressure of the second pressure-holding valve (2) is set to 1.5 times the working pressure of the water supply pipeline.

6. The pressure-stabilized water supply system based on a ski resort-type water system according to claim 3, characterized in that, The return water pipeline includes a first return water pipe (3) and a second return water pipe (4), which are respectively connected to the drain ports of the first pressure holding valve (1) and the second pressure holding valve (2).

7. The pressure-stabilized water supply system based on a ski resort-type water system according to claim 1, characterized in that, A butterfly valve is provided on the drain pipe (10).

8. The pressure-stabilized water supply system based on a ski resort-type water system according to claim 1, characterized in that, The pressure-holding and constant-pressure valve is a spring-loaded micro-lift safety valve.

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