Box-type pressure regulating tower and pressure regulating method

Abstract

This invention discloses a box-type pressure regulating tower and pressure regulating method, including a valve body, a piston, a piston cylinder, a water tank, and a water supply valve control assembly. The piston cylinder is located at the top of the valve body, and the piston is located inside the piston cylinder. The water tank is located at the top of the piston cylinder. A sealing surface is provided at the bottom of the valve body below the piston, and a flow guiding channel runs through the middle of the piston. The piston is configured such that when the pressure in the pipeline is lower than a first threshold, the piston seals against the sealing surface, thereby closing the flow guiding channel; when the pressure in the pipeline is higher than a second threshold, the lower surface of the piston moves upward under the force of water pressure, thereby opening the flow guiding channel. The water supply valve control assembly is separate from the piston and is configured such that when the pressure in the pipeline is lower than the second threshold, water in the water tank flows to the valve body through the water supply valve control assembly; when the pressure in the pipeline is higher than the second threshold, the water supply valve control assembly is in a closed state. The first threshold is higher than the second threshold. This invention can reduce the height of the pressure regulating tower required for high-pressure pipelines, has low cost, and high safety.

Description

Technical Field

[0001] This invention relates to the field of pipeline valve technology, specifically to a box-type pressure regulating tower and pressure regulating method. Background Technology

[0002] In pressurized water transmission pipelines and pressurized water diversion pipelines for hydropower generation, water hammer prevention devices such as bidirectional surge tanks are often required to prevent water hammer damage. Theory and extensive engineering practice have proven that bidirectional surge tanks are the most effective and reliable among all water hammer prevention devices. However, bidirectional surge tanks also have a fatal drawback in engineering applications: their height must be higher than or equal to the highest water pressure line of the pipeline at their installation location. If the pipeline pressure is low, a bidirectional surge tank is generally unnecessary. If the pipeline pressure is very high, a bidirectional surge tank is required, but at this point, the water pressure line is very high, so the bidirectional surge tank is also very high, often reaching tens or even hundreds of meters. This results in high project costs, increased operational and management burdens, difficulty in coordinating with the surrounding environment, and difficulty in ensuring the safety of the structure itself. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a box-type surge tank and a pressure regulating method. The present invention features a novel structural design, enabling the achievement of higher opening pressure settings with a lower water head. This significantly reduces the height of the surge tank required for high-pressure pipelines, resulting in low cost and high safety.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] On one hand, the present invention provides a box-type pressure regulating tower, including a valve body, a piston, a piston cylinder, a water tank, and a water supply valve control assembly. The piston cylinder is disposed on the top of the valve body, the piston is disposed inside the piston cylinder, the water tank is disposed on the top of the piston cylinder, a sealing surface is provided at the bottom of the valve body below the piston, and a flow guiding channel is provided through the middle of the piston. The piston is configured such that when the pressure in the pipeline is lower than a first threshold, the bottom surface of the piston seals against the sealing surface to close the flow guiding channel; when the pressure in the pipeline is higher than a second threshold, the lower surface of the piston moves upward under the force of water pressure to open the flow guiding channel. The water supply valve control assembly is disposed separately from the piston. The water supply valve control assembly is configured such that when the pressure in the pipeline is lower than the second threshold, water in the water tank flows to the valve body through the water supply valve control assembly; when the pressure in the pipeline is higher than the second threshold, the water supply valve control assembly is in a closed state; the first threshold is higher than the second threshold.

[0006] The water supply valve control assembly is separately configured from the piston, including the water supply valve control assembly being configured between the valve body and the water tank, and including but not limited to the pipeline being configured between the valve body and the water tank. The on / off state of the water supply valve control assembly is not used to control the piston.

[0007] The sealing surface provided at the bottom of the valve body includes, but is not limited to, a boss provided at the bottom of the valve body, with the top surface of the boss serving as the sealing surface.

[0008] Preferably, the piston includes an upper piston section and a lower piston section arranged coaxially and connected vertically. The inner part of the lower surface of the lower piston section can form a seal with the top surface of the sealing surface, and the outer part of its lower surface is in direct contact with the water flow inside the valve body.

[0009] More preferably, the lower piston section includes a first lower piston section and a second lower piston section arranged coaxially and connected vertically. The lower surface of the second lower piston section can form a seal with the top surface of the sealing surface. The lower surface of the first lower piston section is in direct contact with the water flow inside the valve body. The ratio of the lower surface area of ​​the second lower piston section to the lower surface area of ​​the first lower piston section does not exceed 5%.

[0010] More preferably, the ratio of the area of ​​the piston's upper surface subjected to water pressure from the water tank to the area of ​​the piston's lower surface subjected to water pressure from the pipe is (5-15):1.

[0011] Preferably, a filter screen is provided on the piston at the upper outlet of the guide channel, and the flow area of ​​the filter screen is more than twice the flow area of ​​the guide channel.

[0012] Preferably, the water supply valve control assembly includes a connecting pipe and a one-way valve. The connecting pipe is located on the side of the lower water tank, with its upper end connected to the lower water tank and its lower end connected to the valve body. The one-way valve is located at the connection between the connecting pipe and the valve body, and the one-way valve only allows water to flow from the lower water tank to the valve body.

[0013] More preferably, the top of the connecting pipe is provided with a reserved interface.

[0014] Preferably, the water tank includes an upper water tank and a lower water tank, the bottom of the upper water tank is inserted into and communicates with the lower water tank, and a height adjustment component for adjusting the height of the water tank is provided between the upper water tank and the lower water tank.

[0015] More preferably, the height adjustment assembly includes a screw, a nut, and a screw interface. The screw is vertically fixed to the top of the lower water tank, the screw interface is fixed to the outer wall of the upper water tank and sleeved on the screw, and nuts are threaded onto the screws on both the upper and lower sides of the screw interface.

[0016] On the other hand, the present invention provides a pressure regulating method for a box-type pressure regulating tower, comprising:

[0017] When the pressure inside the pipeline is between a first threshold and a second threshold, both the water supply valve control component and the flow guiding channel are in a closed state, wherein the first threshold is higher than the second threshold.

[0018] When the pressure inside the pipeline is higher than the first threshold, the water supply valve control component is in the closed state. The piston moves upward under the action of the water pressure in the pipeline, thereby opening the flow channel. At this time, the water in the pipeline flows from the flow channel to the water tank for pressure relief. As the pressure inside the pipeline decreases, the piston gradually moves downward until the flow channel is closed.

[0019] When the pressure inside the pipeline is lower than the second threshold, the flow channel is closed, and the one-way valve opens under the pressure of the water tank. At this time, the water in the water tank flows from the connecting pipe to the valve body. As the pressure inside the pipeline rises, the opening angle of the one-way valve gradually decreases until it closes.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] Traditional surge tanks typically integrate the water supply valve control assembly and the piston together. While this integration reduces the overall size of the surge tank, it introduces some interference between the two during water supply and drainage. For example, in the event of a sudden pressure surge and water hammer in the pipeline, the water supply valve control assembly must be closed first before the piston can be pushed to release pressure, resulting in a delay and hindering timely response. In contrast, this invention separates the water supply valve control assembly and the piston, allowing them to operate independently without interference. When the water pressure in the pipeline changes abruptly, both the piston and the water supply valve control assembly can respond immediately.

[0022] This invention separates the water supply valve control component and the piston. This is not only to prevent interference between the two, but more importantly, to increase the amplification ratio of the pressure regulating tower (5-15:1). That is, while keeping the water pressure-receiving area on the upper surface of the piston constant, the water pressure-receiving area on the lower surface of the piston is greatly reduced. Due to this amplification ratio, a higher opening pressure setting can be achieved with a lower water head. In other words, the same pressure relief function can be achieved with a very small pressure regulating tower height, which greatly reduces the height of the pressure regulating tower required for high-pressure pipelines, resulting in low construction costs. At the same time, pressure relief / compensation can be performed when the pipeline pressure rises / falls to a certain value, avoiding / suppressing water hammer and ensuring high safety.

[0023] Because there is a linear relationship between the height of the pressure regulating tower and the piston opening pressure, in engineering applications, when adjusting the opening pressure as needed, the insertion depth between the upper and lower water tanks can be adjusted by adjusting the nut on the screw, thereby controlling the installation height of the upper water tank and adjusting the height of the pressure regulating tower to achieve significant adjustment of the opening pressure. Furthermore, a smaller diameter rectifier tube is installed at the highest point of the overflow pipe. When fine-tuning of the stable liquid level in the water tank is required, the height of the rectifier tube can be adjusted by rotating it, thereby adjusting the liquid level in the tower and also achieving slight adjustment of the opening pressure. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the present invention;

[0025] Figure 2 This is a schematic cross-sectional view of the valve body according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic cross-sectional view of a height adjustment component according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of piston force analysis according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of piston force analysis according to another embodiment of the present invention.

[0029] Reference numerals: 1. Valve body; 11. Boss; 110. Sealing surface; 12. Top flange; 13. First guide sleeve; 14. Vent hole; 15. Side flange; 2. Piston; 21. Upper section of piston; 22. Lower section of piston; 221. Lower section of first piston; 222. Lower section of second piston; 24. Flow guide channel; 25. Filter screen; 3. Piston cylinder; 4. Water tank; 41. Upper water tank; 42. Lower water tank; 43. Height adjustment assembly; 431. Screw; 432. Nut; 433. Screw interface; 44. Overflow pipe; 45. Rectifying pipe; 5. Water supply valve control assembly; 51. Connecting pipe; 52. Check valve; 53. Reserved interface; 6. Support leg; 7. Top cover. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present patent.

[0031] like Figure 1-5 As shown, the present invention provides a box-type pressure regulating tower, including a valve body 1, a piston 2, a piston cylinder 3, a water tank 4, and a water replenishment valve control assembly 5. The piston cylinder 3 is sealed to the top of the valve body 1, the piston 2 is disposed inside the piston cylinder 3 and forms a sliding fit relationship with it, the water tank 4 is sealed to the top of the piston cylinder 3, and the water replenishment valve control assembly 5 is used to unidirectionally replenish water from the water tank 4 into the valve body 1.

[0032] Please refer to 2, in one embodiment:

[0033] The valve body 1 has a T-shaped or angled structure. Side flanges 15 are provided on both the left and right sides of the valve body 1 for connecting pressure pipelines and check valves 52; the side flanges 15 can be arranged at 180° or 9°; a top flange 12 is provided at the top, which is fixedly connected to the piston cylinder 3. A first guide sleeve 13 is embedded in the middle of the top flange 12, and the mating part between the top flange 12 and the first guide sleeve 13 is sealed. A vent hole 14 is provided on the top flange 12 for venting and replenishing air in the piston cylinder 3 during the movement of the piston 2; a boss 11 is provided at the bottom of the valve body 1 corresponding to the piston 2, and the top surface of the boss 11 is a sealing surface 110, which mates with the bottom surface of the piston 2 to form a seal; three or more base plates are provided on the outer side of the bottom of the valve body 1, and the base plates and support legs 6 are connected to form the equipment foundation support.

[0034] Please refer to 4, in one embodiment:

[0035] Piston 2 is a stepped hollow cylinder. A flow channel 24 is provided through the middle of piston 2. Piston 2 includes an upper piston section 21, a first lower piston section 221, and a second lower piston section 222, which are coaxially arranged and connected from top to bottom. The outer diameters of the upper piston section 21, the first lower piston section 221, and the second lower piston section 222 decrease sequentially. The upper piston section 21 is located inside the piston cylinder 3 and slides after cooperating with the inner wall of the piston cylinder 3 and is provided with a seal. The first lower piston section 221 slides after cooperating with the first guide sleeve 13 and is provided with a seal. The second lower piston section 222 is located inside the valve body 1, and a seal can be formed between the lower surface of the second lower piston section 222 and the sealing surface 110. The ratio of the lower surface area of ​​the second piston lower section 222 to the lower surface area of ​​the first piston lower section 221 does not exceed 5%. The lower surface area of ​​the second piston lower section 222 is designed to be much smaller than the lower surface area of ​​the first piston lower section 221. This ensures that the area of ​​water flow acting on the lower surface of the piston remains basically unchanged at the moment of opening, and does not affect the opening action.

[0036] The above-described piston 2 structure ensures that the piston 2 is subjected to the following forces when it is in the pre-opening and stable-opening states:

[0037] H×S i +G=P×S2

[0038] In the formula:

[0039] H represents the liquid level in the water tank, in MPa;

[0040] S1 is the piston's surface area subjected to water pressure from the tank, in mm. 2 ;

[0041] G is the piston weight, in N;

[0042] P is the pressure at the inlet of the surge tank, in MPa;

[0043] S2 is the piston's surface area subjected to water pressure from the pipe, in mm. 2 ;

[0044] Based on the equipment structure, it can be concluded that:

[0045]

[0046] In the formula: D1 is the outer diameter of the upper section of the piston, D2 is the outer diameter of the lower section of the first piston, and D3 is the inner diameter of the flow channel.

[0047] Due to this balance, when P rises, meaning the pipeline pressure exceeds the equipment's set opening pressure (i.e., the first threshold), piston 2 moves upward to open, allowing water to flow through the guide channel into the upper water tank 4, and then through the funnel into the overflow pipe 44 for discharge, thus achieving the pressure relief function. The ratio of S1 to S2 is the amplification ratio of the pressure regulating tower, typically between 5 and 15. Because of this amplification ratio, a higher opening pressure setting can be achieved with a lower water head. In contrast, traditional bidirectional pressure regulating towers (i.e., high-level communicating vessels) can achieve the same pressure relief function with a much smaller height.

[0048] Please refer to 5, in one embodiment:

[0049] Piston 2 is a stepped hollow cylinder. The difference between this embodiment and the piston in the previous embodiment is that piston 2 in this embodiment is a two-step hollow cylinder, consisting of an upper piston section 21 and a lower piston section 22. The lower surface of the lower piston section 22 is flat. The inner part of the lower surface of the lower piston section 22 can form a seal with the sealing surface 110, while the outer part of the lower surface of the lower piston section 22 is in direct contact with the water flow in the valve body. Alternatively, the ratio of the area of ​​the inner part of the lower surface of the lower piston section 22 to the area of ​​the outer part of the lower surface of the lower piston section 22 can be designed to not exceed 5%.

[0050] Please refer to 1, in one embodiment:

[0051] A filter screen 25 is installed on the piston 2 at the upper outlet corresponding to the flow channel 24. Its function is to prevent debris in the top water tank 4 from entering the pipe. The filter screen 25 is a U-shaped filter screen 25, and its flow area should be more than twice the flow area of ​​the piston 2 to minimize the head loss generated when the water flows through.

[0052] Please refer to 1, in one embodiment:

[0053] The water tank 4 includes an upper water tank 41 and a lower water tank 42. The bottom of the upper water tank 41 is inserted into and communicates with the lower water tank 42. The lower water tank 42 is connected and fixed to the piston cylinder 3, and a seal is provided at the connection. The inner diameter of the lower water tank 42 is slightly smaller than the inner diameter of the piston cylinder 3, thus limiting the maximum upward movement of the piston 2 after connection. The lower pipe of the upper water tank 41 is inserted into the lower water tank 42, and a seal is provided at the mating part. A height adjustment component 43 is provided at the connection position between the lower water tank 42 and the upper water tank 41. The insertion depth of the upper water tank 41 in the lower water tank 42 can be adjusted by the height adjustment component 43, thereby controlling the installation height of the upper water tank 41. By adjusting the nut 432 on the screw 431, the overall height of the water tank 4 can be adjusted over a wide range, thereby adjusting the opening pressure.

[0054] like Figure 3 As shown, the height adjustment assembly 43 includes a screw 431, a nut 432, and a screw interface 433. The screw 431 is vertically fixed to the top of the lower water tank 42. The screw interface 433 is fixed to the outer wall of the upper water tank 41 and sleeved onto the screw 431. Nuts 432 are threaded onto the screws 431 on both the upper and lower sides of the screw interface 433. By adjusting the nuts 432 on the screws 431, the overall height of the water tank 4 can be adjusted over a wide range, thereby adjusting the opening pressure.

[0055] Please refer to 1, in one embodiment:

[0056] The water supply valve control assembly 5 includes a connecting pipe 51 and a one-way valve 52. The connecting pipe 51 is located on the side of the lower water tank 42. The upper end of the connecting pipe 51 is connected to the lower water tank 42, and the lower end of the connecting pipe 51 is connected to the valve body 1. The one-way valve 52 is located at the connection between the lower end of the connecting pipe and the valve body 1. The one-way valve 52 only allows water to flow from the lower water tank 42 to the valve body 1.

[0057] A check valve 52 is installed between the water tank 4 and the valve body 1. Therefore, when the pipeline pressure is lower than the pressure value (second threshold) generated by the water tank 4 on the check valve, the check valve 52 opens under the action of the pressure difference between the water level in the water tank 4 and the pipeline, allowing water in the tower to flow into the valve body 1 through the check valve 52 and into the pipeline to replenish the pipeline medium and prevent negative pressure. The check valve 52 can be of various types and can be installed horizontally or vertically. However, it must be ensured that a pressure difference of 0.3 to 0.5 m is sufficient for full opening. The illustrated structure is a simple spring-loaded check valve 52. Due to the limited height and diameter of the water tank 4, its volume may be too small to meet the system's water replenishment needs. In this case, an external water tank can be connected through the reserved interface 53.

[0058] The upper water tank 41 is equipped with an overflow pipe 44 and a rectifier pipe 45. The overflow pipe 44 is located at the top of the water tank 4 and has an inverted trapezoidal funnel structure inside. When the liquid level exceeds the top of the funnel, it can be tilted over the funnel and flow out from the overflow port. The rectifier pipe 45 has an L-shaped adjustable structure. When it is necessary to fine-tune the stable liquid level in the water tank 4, the height of the rectifier pipe 45 can be adjusted by rotating the L-shaped rectifier pipe 45, thereby adjusting the liquid level in the tower and achieving a small range of adjustment of the opening pressure.

[0059] The normal maximum liquid level of water tank 4 can be adjusted by rotating the rectifier tube 45. The top of water tank 4 is equipped with a top cover 7 to prevent external debris from entering and to prevent it from falling; under good operating conditions, the top cover may not be required.

[0060] Based on the above-described pressure regulating tower structure, the present invention provides a pressure regulating method for a box-type pressure regulating tower, comprising:

[0061] When the pressure inside the pipeline is between the first threshold and the second threshold, the water supply valve control assembly (5) and the flow guiding channel (24) are both in the closed state, wherein the first threshold is higher than the second threshold;

[0062] When the pressure inside the pipeline is higher than the first threshold, the water supply valve control component (5) is in the closed state. The piston (2) moves upward under the action of the water pressure in the pipeline, thereby opening the flow channel (24). At this time, the water in the pipeline flows from the flow channel (24) to the water tank (4) to release pressure. As the pressure inside the pipeline decreases, the piston (2) gradually moves downward until the flow channel (24) is closed.

[0063] When the pressure inside the pipeline is lower than the second threshold, the flow channel (24) is closed, and the one-way valve (52) opens under the pressure of the water tank (4). At this time, the water in the water tank (4) flows from the connecting pipe (51) to the valve body (1). As the pressure inside the pipeline rises, the opening angle of the one-way valve (52) gradually decreases until it closes.

[0064] The first threshold is the sum of the piston's own weight and the water pressure generated by the water tank, and the second threshold is the water pressure generated by the water tank on the one-way valve.

[0065] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the box-type pressure regulating tower and pressure regulating method of this invention, and can produce the positive effects described in this invention.

[0066] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0067] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

[0069] The above description is merely a preferred embodiment of the present invention, but the present invention is not limited to the specific embodiments described above. Those skilled in the art can make various modifications, additions, or substitutes with similar methods without departing from the principles of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A box-type pressure regulating tower, comprising a valve body (1), a piston (2), a piston cylinder (3), a water tank (4), and a water supply valve control assembly (5), characterized in that: A sealing surface (110) is provided at the bottom of the valve body (1) below the piston (2), and a flow channel (24) is provided through the middle of the piston (2); the piston (2) is configured such that when the pressure in the pipeline is lower than the first threshold, the bottom surface of the piston (2) seals against the sealing surface (110) to close the flow channel (24); when the pressure in the pipeline is higher than the first threshold, the lower surface of the piston (2) moves upward under the force of water pressure to open the flow channel (24); the water supply valve control assembly (5) is set separately from the piston (2), and the water supply valve control assembly (5) is configured such that when the pressure in the pipeline is lower than the second threshold, the water in the water tank (4) flows to the valve body (1) through the water supply valve control assembly (5); when the pressure in the pipeline is higher than the second threshold, the water supply valve control assembly is in a closed state; the first threshold is higher than the second threshold; The piston (2) includes an upper piston section (21) and a lower piston section (22) arranged coaxially and connected vertically. The lower piston section (22) includes a first lower piston section (221) and a second lower piston section (222) arranged coaxially and connected vertically. The ratio of the lower surface area of ​​the second lower piston section (222) to the lower surface area of ​​the first lower piston section (221) does not exceed 5%. The ratio of the area of ​​the upper surface of the piston (2) subjected to water pressure from the water tank to the area of ​​the lower surface of the piston (2) subjected to water pressure from the pipe is (5~15):

1. The water tank (4) includes an upper water tank (41) and a lower water tank (42). The bottom of the upper water tank (41) is inserted into and communicates with the lower water tank (42). A height adjustment component (43) for adjusting the height of the water tank (4) is provided between the upper water tank (41) and the lower water tank (42). The water supply valve control assembly (5) includes a connecting pipe (51) and a one-way valve (52). The connecting pipe (51) is located on the side of the lower water tank (42). The upper end of the connecting pipe (51) is connected to the lower water tank (42), and the lower end of the connecting pipe (51) is connected to the valve body (1). The one-way valve (52) is located at the connection between the connecting pipe (51) and the valve body (1). The one-way valve (52) only allows water to flow from the lower water tank (42) to the valve body (1).

2. The box-type pressure regulating tower according to claim 1, characterized in that: The inner part of the lower surface of the piston lower section (22) can form a seal with the top surface of the sealing surface (110), and the outer part of its lower surface is in direct contact with the water flow inside the valve body (1).

3. The box-type pressure regulating tower according to claim 2, characterized in that: The lower surface of the second piston lower section (222) can form a seal with the top surface of the sealing surface (110), and the lower surface of the first piston lower section (221) is in direct contact with the water flow inside the valve body (1).

4. The box-type pressure regulating tower according to claim 1, characterized in that: A filter screen (25) is provided on the piston (2) at the upper outlet of the guide channel (24), and the flow area of ​​the filter screen (25) is more than twice the flow area of ​​the guide channel (24).

5. The box-type pressure regulating tower according to claim 1, characterized in that: The top of the connecting pipe (51) is provided with a reserved interface (53).

6. The box-type voltage regulating tower according to claim 1, characterized in that: The height adjustment assembly (43) includes a screw (431), a nut (432) and a screw interface (433). The screw (431) is vertically fixed to the top of the lower water tank (42). The screw interface (433) is fixed to the outer wall of the upper water tank (41) and sleeved on the screw (431). Nuts (432) are threaded onto the screws (431) on both the upper and lower sides of the screw interface (433).

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