Eccentric double-hemisphere intelligent irrigation regulating valve

By designing an eccentric double-hemispherical intelligent irrigation regulating valve in the irrigation system, the problem that existing three-way valves cannot regulate flow on one side has been solved, realizing flexible flow control and remote operation, and is suitable for areas with high sediment content.

CN224380697UActive Publication Date: 2026-06-19LONGYAO ZHENGDIE VALVE CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
LONGYAO ZHENGDIE VALVE CO LTD
Filing Date
2025-08-21
Publication Date
2026-06-19

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  • Figure CN224380697U_ABST
    Figure CN224380697U_ABST
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Abstract

This invention provides an eccentric double-hemispherical intelligent irrigation regulating valve, comprising a valve body, valve cores, and an adjusting assembly. The valve body includes an inlet pipe and two outlet pipes connected to it. A valve core is installed at the inlet end of each outlet pipe. The flow rate of the water flowing out of the two outlet pipes is adjusted by rotating the valve cores using the adjusting assembly. Specifically, in this application, valve cores are installed on both outlet pipes. When both valve cores are closed, the entire three-way valve is closed. When a single valve core is open, irrigation water flows to one side. When both valve cores are open, irrigation water is supplied to both outlet pipes. The adjusting assembly allows adjustment of the valve core opening relative to the outlet pipes, enabling flexible and convenient adjustment of the flow rate on one side based on the irrigation area.
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Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to an eccentric double hemisphere intelligent irrigation regulating valve. Background Technology

[0002] During irrigation, farmland typically splits its main water supply line into two branches for bidirectional irrigation. Therefore, a three-way valve is installed on the main water supply line to divide it into two water lines. However, most three-way valves on the market currently have their valve cores located at the junction of the inlet and outlet pipes. These valve cores primarily switch the direction of water output and cannot adjust the output flow of the two branches. When bidirectional irrigation is required, it is impossible to adjust the flow rate on each side individually, making it inconvenient to control the branch flow rate during irrigation when the irrigated areas are different. Utility Model Content

[0003] This utility model provides an eccentric double hemisphere intelligent irrigation regulating valve, which aims to solve the problem that the existing three-way valve cannot adjust the flow at the output end on one side, thus making it inconvenient to control the branch flow during irrigation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an eccentric double-hemispherical intelligent irrigation regulating valve, comprising:

[0005] The valve body includes an inlet pipe and two outlet pipes connected to the inlet pipe;

[0006] There are two valve cores, which are rotatably installed at the ends of the two outlet pipes that communicate with the inlet pipes, and are used to control the flow state of the outlet pipes.

[0007] An adjustment component, mounted on the valve body, is used to drive the valve core to rotate and adjust the opening of the outlet pipe.

[0008] In one possible implementation, the regulating component includes:

[0009] The main shaft is rotatably mounted on the valve body;

[0010] A drive unit is mounted on the valve body and is connected to the main shaft for transmission.

[0011] A limiting component is disposed between the main shaft and the valve body to limit the main shaft from continuing to rotate in the same direction when the outlet pipe is in a normally open or normally closed state.

[0012] In one possible implementation, the limiting component includes:

[0013] A cylindrical block is fixedly mounted on the main shaft, and an arc-shaped groove is provided on the side wall of the cylindrical block;

[0014] A limiting component is fixedly installed on the valve body, and a limiting piece is bent and slidably disposed inside the arc-shaped groove on the limiting component.

[0015] In one possible implementation, one end of the cylindrical block is provided with an anti-rotation block, one end of the spindle is provided with an anti-rotation hole for mounting the anti-rotation block, and the bottom end of the anti-rotation hole is threaded with a fastener for fixing the anti-rotation block into the anti-rotation hole.

[0016] In one possible implementation, a housing for mounting the drive component is fixedly mounted on the outer side of the valve body, and the main shaft includes:

[0017] The drive section is rotatably disposed inside the housing and is connected to the drive end of the drive component.

[0018] A transmission section is connected between the drive section and the valve core, and the transmission section is provided with a rotation hole to facilitate the rotation of the transmission section.

[0019] In one possible implementation, the bottom of the housing is provided with an inner sleeve protruding outwards, and the outer side wall of the valve body is provided with an outer sleeve for installing the inner sleeve protruding outwards, and the inner sleeve is threadedly connected with a fastener for fixing to the inside of the outer sleeve.

[0020] In one possible implementation, the inlet pipe is provided with two outlet ends for communicating with the outlet pipe, and the outlet pipe is detachably installed on the outlet ends.

[0021] In one possible implementation, a flange for fixing to the outlet end is fixedly installed at the end of the outlet pipe, and a sealing ring is provided between the flange and the outlet end.

[0022] In one possible implementation, a guide sleeve is provided protruding from the side of the flange and slidably disposed inside the liquid outlet end, and the sealing ring is installed on the outside of the guide sleeve.

[0023] In one possible implementation, a support shaft is fixedly mounted on the valve core, a semi-circular hole for mounting the support shaft is provided on the inner wall of the liquid outlet end, and an arc-shaped hole corresponding to the semi-circular hole is provided at the end of the guide sleeve, and the semi-circular hole and the arc-shaped hole form a guide hole for mounting the support shaft.

[0024] The solution shown in this application, compared with the prior art, incorporates a valve body comprising an inlet pipe and two outlet pipes interconnected with it. The two outlet pipes are coaxially aligned, with the axis of the inlet pipe perpendicular to the axis of the outlet pipes. A valve core is installed at the inlet end of each outlet pipe, and the flow rate of the water from both outlet pipes is adjusted by rotating the valve core using an adjusting assembly. Specifically, this application provides valve cores on both outlet pipes. When both valve cores are closed, the entire three-way valve is closed. When a single valve core is open, irrigation water flows to one side. When both valve cores are open, irrigation water is supplied to both outlet pipes. Furthermore, the opening between the valve core and the outlet pipe is adjusted by rotating the valve core using the adjusting assembly, allowing for flexible and convenient adjustment of the water flow rate on one side based on the irrigation area, making it more suitable for on-site use. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of the eccentric double-hemispherical intelligent irrigation regulating valve provided in an embodiment of this utility model;

[0026] Figure 2 A schematic diagram of the spindle mounting structure provided for an embodiment of this utility model;

[0027] Figure 3 Provided for the embodiments of this utility model Figure 1 Enlarged view of part A in the middle;

[0028] Figure 4 This is a schematic diagram of the internal structure of the box provided in an embodiment of the present utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Valve body; 11. Inlet pipe; 111. Outlet end; 12. Outlet pipe; 121. Flange; 122. Sealing ring; 123. Guide sleeve; 13. Outer sleeve; 131. Fixing component; 2. Valve core; 21. Support shaft; 3. Adjustment assembly; 31. Main shaft; 311. Drive section; 312. Transmission section; 32. Drive component; 33. Limiting assembly; 331. Cylindrical block; 332. Limiting component; 333. Fastener; 4. Housing; 41. Inner sleeve. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] Please refer to the following: Figures 1 to 4The eccentric double-hemispherical intelligent irrigation regulating valve provided by this utility model will now be described. The eccentric double-hemispherical intelligent irrigation regulating valve includes a valve body 1, a valve core 2, and an adjusting assembly 3. The valve body 1 includes an inlet pipe 11 and two outlet pipes 12 connected to the inlet pipe 11; there are two valve cores 2, each rotatably mounted at the end of the two outlet pipes 12 connected to the inlet pipe 11, used to control the flow state of the outlet pipes 12; the adjusting assembly 3 is mounted on the valve body 1 and is used to drive the valve cores 2 to rotate, thereby adjusting the opening degree of the outlet pipes 12.

[0033] The eccentric double-hemispherical intelligent irrigation regulating valve provided in this embodiment, compared with the prior art, features a valve body 1, which includes an inlet pipe 11 and two outlet pipes 12 connected to the inlet pipe 11. The two outlet pipes 12 are coaxially arranged, and the axis of the inlet pipe 11 is perpendicular to the axis of the outlet pipe 12. A valve core 2 is installed at the inlet end of each of the two outlet pipes 12, and the flow rate of the water flowing out of the two outlet pipes 12 is adjusted by rotating the valve core 2 using an adjusting component 3. Specifically, in this application, a valve core 2 is provided on each of the two outlet pipes 12. When both valve cores 2 are closed, a three-way valve can be closed. When a single valve core 2 is open, the irrigation water source can flow to one side. When both valve cores 2 are open, the irrigation water source can be supplied to both outlet pipes 12. Furthermore, by adjusting component 3, the valve core 2 can be rotated to adjust the opening between the valve core 2 and the outlet pipe 12, allowing the water output on one side to be freely adjusted according to the irrigation area on site, making it more flexible and convenient for on-site use.

[0034] Specifically, in this embodiment, the ball core is a hemispherical valve core 2, and a rotation space for accommodating the rotation of the ball core is provided at the intersection of the inlet pipe 11 and the outlet pipe 12.

[0035] Specifically, in this embodiment, during irrigation, the incoming water contains some sediment. This application uses two hemispherical valve cores to individually regulate the flow rate of the outlet pipe 12. Compared to the existing technology of a single-ball valve core, this avoids sediment residue inside the valve body. The structure in this application can effectively discharge sediment during irrigation, reducing the impact of sediment water quality on the overall service life of the valve body. It is suitable for applications in areas with high sediment water quality. Simultaneously, the design of the hemispherical valve core 2 reduces the overall space of the valve body 1, increasing the flow area within the effective space of the valve body 1.

[0036] In some embodiments, the adjustment component 3 described above may employ, for example... Figure 1 , Figure 2 and Figure 4 The structure shown. See also... Figure 1 , Figure 2 and Figure 4The adjusting assembly 3 includes a main shaft 31, a drive component 32, and a limiting assembly 33. The main shaft 31 is rotatably mounted on the valve body 1; the drive component 32 is mounted on the valve body 1 and is connected to the main shaft 31 in a transmission manner; the limiting assembly 33 is located between the main shaft 31 and the valve body 1, and is used to limit the main shaft 31 from continuing to rotate in the same direction when the outlet pipe 12 is in a normally open or normally closed state. A rotating end for connecting the main shaft 31 is provided at the end of the valve core 2. The rotating end is rotatably mounted on the valve body 1, and a sealing sleeve is fitted on the outside of the rotating end to achieve a sealed connection between the sealing end and the valve body 1. A plug-in part is provided at the end of the main shaft 31. The plug-in part is inserted into the rotating end, and an anti-rotation edge is provided between the plug-in part and the rotating end to prevent the plug-in part from rotating relative to the rotating end.

[0037] Specifically, in this embodiment, the drive component 32 is mounted on the valve body 1. The drive component 32 is a motor. The drive component 32 drives the main shaft 31 to rotate, and the main shaft 31 drives the valve core 2 to rotate. Thus, the opening between the valve core 2 and the outlet pipe 12 can be adjusted by the drive component 32.

[0038] Specifically, in this embodiment, the drive end of the drive component 32 and the main shaft 31 are connected by gear transmission.

[0039] Preferably, in this embodiment, the application further includes a controller for controlling the working state of the drive component 32, which can remotely control the working state of the drive component 32 to achieve remote control of the water output. Specific control methods and techniques are existing technologies and will not be described further here.

[0040] Specifically, in this embodiment, the design of the limiting component 33 allows the valve core 2 to rotate between fully open and fully closed. When the main shaft 31 rotates in one direction until the limiting component 33 acts as a limiting element, the valve core 2 is in a fully open or fully closed state. This facilitates the closing or full opening of the valve body 1.

[0041] In some embodiments, the aforementioned limiting component 33 may employ, for example... Figure 2 The structure shown. See also Figure 2The limiting assembly 33 includes a cylindrical block 331 and a limiting member 332. The cylindrical block 331 is fixedly mounted on the main shaft 31, and an arc-shaped groove is provided on the side wall of the cylindrical block 331. The limiting member 332 is fixedly mounted on the valve body 1, and a limiting piece that is bent and slidably disposed inside the arc-shaped groove is provided on the limiting member 332. The cylindrical block 331 is mounted on the top of the main shaft 31, and an arc-shaped groove is provided on the outer side wall of the cylindrical block 331. The limiting piece is slidably disposed inside the arc-shaped groove. The limiting piece and the limiting member 332 are integrally formed. The limiting member 332 is fixedly mounted on the valve body 1 by bolts, so that when the main shaft 31 rotates, it will drive the cylindrical block 331 to rotate together. This allows the limiting piece to slide inside the arc-shaped groove. When the limiting piece abuts against the end of the arc-shaped groove, it limits the rotation of the cylindrical block 331. The structure is simple and saves installation space.

[0042] Specifically, in this embodiment, the length direction of the arc-shaped groove is set along the circumference of the cylindrical block 331.

[0043] In some embodiments, the cylindrical block 331 described above can be as follows: Figure 2 The structure shown. See also Figure 2 One end of the cylindrical block 331 has a protruding anti-rotation block, and one end of the main shaft 31 has an anti-rotation hole for installing the anti-rotation block. The bottom end of the anti-rotation hole is threaded with a fastener 333 for fixing the anti-rotation block inside the anti-rotation hole. The anti-rotation block and the axis of the cylindrical block 331 are parallel and spaced apart, as are the anti-rotation hole and the axis of the main shaft 31. When the anti-rotation block is installed inside the anti-rotation hole, the cylindrical block 331 and the main shaft 31 are coaxial. This ensures the relative position of the cylindrical block 331 and the main shaft 31 along their circumferential direction. An anti-rotation edge is provided between the main shaft 31 and the rotating end of the valve core 2, allowing the cylindrical block 331 to maintain its relative position with the valve core 2 along its circumferential direction. When the limiting plate abuts against the end of the arc-shaped groove, the valve core 2 is in a fully closed or fully open state.

[0044] Specifically, in this embodiment, the anti-rotation block is provided with a through hole for avoiding the fastener 333. The fastener 333 is a bolt, which can be used to fix the anti-rotation block to the spindle 31.

[0045] In some embodiments, the spindle 31 described above can be as follows: Figure 1 , Figure 3 and Figure 4 The structure shown. See also... Figure 1 , Figure 3 and Figure 4A housing 4 for mounting the drive component 32 is fixedly installed on the outside of the valve body 1. The main shaft 31 includes a drive section 311 and a transmission section 312. The drive section 311 is rotatably disposed inside the housing 4 and is connected to the drive end of the drive component 32. The transmission section 312 is connected between the drive section 311 and the valve core 2, and a rotation hole is provided on the transmission section 312 to facilitate its rotation. The housing 4 is fixedly installed on the outside of the valve body 1, and the drive component 32 and the limiting component 33 are both installed inside the housing 4, which can protect the drive component 32 and the limiting component 33. When the housing 4 is in a closed state, the inside of the housing 4 is a sealed structure with the outside.

[0046] Specifically, in this embodiment, the drive section 311 is rotatably disposed inside the housing 4, and the transmission section 312 is located between the housing 4 and the valve body 1. A rotating hole is provided on the outer wall of the transmission section 312, and the cross-section of the rotating hole is hexagonal, so that the opening degree of the valve core 2 can be manually adjusted by using a hexagonal wrench. Even if the drive component 32 fails, the opening degree of the valve core 2 can still be adjusted manually.

[0047] Specifically, in this embodiment, a slot for placing a hex wrench is provided on the housing 4, and a slot for mounting the hex wrench is also provided on the side wall of the housing 4. This allows for the storage of hex wrenches for later use.

[0048] In some embodiments, the aforementioned housing 4 may adopt the following... Figure 1 , Figure 2 and Figure 4 The structure shown. See also... Figure 1 , Figure 2 and Figure 4 The bottom of the housing 4 has a protruding inner sleeve 41, and the outer wall of the valve body 1 has a protruding outer sleeve 13 for mounting the inner sleeve 41. A fastener 131 for fixing the inner sleeve 41 to the inside of the outer sleeve 13 is threaded onto the inner sleeve 41. When installing the housing 4 onto the valve body 1, the inner sleeve 41 can be slid into the outer sleeve 13. The fastener 131 is a bolt that passes through the outer sleeve 13 and is threaded onto the inner sleeve 41. Thus, the inner sleeve 41 is fixed to the inside of the outer sleeve 13 through the fastener 131, achieving a secure connection between the inner sleeve 41 and the outer sleeve 13.

[0049] Preferably, in this embodiment, a clearance is provided on the side wall of the outer sleeve 13 to allow for the avoidance of a wrench. Meanwhile, the inner sleeve 41 is coaxial with the outer sleeve 13, but the axes of the inner sleeve 41 and the main shaft 31 are parallel and spaced apart. This facilitates the alignment of the mounting position of the fixing member 131 and, during application, prevents the inner sleeve 41 from rotating relative to the outer sleeve 13 when the main shaft 31 rotates, thus avoiding affecting the opening and closing accuracy of the valve core 2.

[0050] In some embodiments, the inlet pipe 11 may be as follows: Figure 1 , Figure 3 The structure shown. See also... Figure 1 , Figure 3 The inlet pipe 11 has two outlet ends 111 for communicating with the outlet pipe 12. The outlet pipe 12 is detachably installed on the outlet ends 111. The two outlet ends 111 are coaxially arranged. The outlet pipe 12 is detachably installed at the outlet ends 111. A sealing ring is provided at the end of the outlet pipe 12 for sealing connection with the valve core 2. One end of the sealing ring is inserted and fixed to the end of the outlet pipe 12. By detachably installing the outlet pipe 12 to the outlet ends 111, it is convenient for later maintenance and replacement of the sealing ring.

[0051] In some embodiments, the above-mentioned outlet pipe 12 can be adopted as follows: Figure 3 , Figure 4 The structure shown. See also... Figure 3 , Figure 4 A flange 121 is fixedly installed at the end of the outlet pipe 12 for fixing to the outlet end 111, and a sealing ring 122 is provided between the flange 121 and the outlet end 111. The flange 121 is bolted to the end of the outlet pipe 12, and the sealing ring 122 achieves a seal between the outlet pipe 12 and the outlet end 111. The structure is simple and facilitates the connection and disassembly of the outlet pipe 12 and the outlet end 111.

[0052] In some embodiments, the flange 121 described above can be as follows: Figure 3 The structure shown. See also Figure 3 A guide sleeve 123 protrudes from the side of the flange 121 and slides inside the outlet end 111. A sealing ring 122 is installed on the outside of the guide sleeve 123. The guide sleeve 123 protrudes from the side of the flange 121 near the outlet end 111. When installing the flange 121, the guide sleeve 123 can slide into the outlet end 111, ensuring that the sealing ring 122 is located inside the outlet end 111. The guide sleeve 123 facilitates positioning of the relative position of the outlet pipe 12 and the outlet end 111, ensuring that the valve core 2 can stably abut against the sealing ring at the end of the outlet pipe 12 to achieve a sealing operation.

[0053] In some embodiments, the valve core 2 may be adopted as follows: Figure 1 The structure shown is described in the following document. Figure 1A support shaft 21 is fixedly mounted on the valve core 2. A semi-circular hole for mounting the support shaft 21 is provided on the inner wall of the outlet end 111. An arc-shaped hole corresponding to the semi-circular hole is provided at the end of the guide sleeve 123, and the semi-circular hole and the arc-shaped hole together form a guide hole for mounting the support shaft 21. The two ends of the valve core 2 are the support shaft 21 and the rotating end, respectively. Specifically, the rotating end is detachably mounted on the valve core 2, while the support shaft 21 and the valve core 2 are integrally formed. During installation, the valve core 2 is placed inside the outlet end 111, and then the rotating end is connected to the valve core 2. Finally, the guide sleeve 123 on the end face of the flange 121 is slid into the outlet end 111, so that the semi-circular hole on the outlet end 111 and the arc-shaped hole at the end of the guide sleeve 123 together form a guide hole for limiting the support shaft 21. The support shaft 21 is rotatably positioned inside the guide hole, thus facilitating the disassembly and installation of the valve core 2.

[0054] Specifically, in this embodiment, the valve core 2 and the rotating end are separate structures. The valve core 2 has a mounting hole for installing the rotating end, and the rotating end is fixed inside the mounting hole by bolts. Simultaneously, the rotating end has an insert portion for sliding into the mounting hole. The insert portion is arranged parallel to the axis of the rotating end at intervals. This prevents the valve core 2 from shifting circumferentially with the rotating end during rotation.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An eccentrically double-hemisphere smart irrigation regulating valve, characterized in that, include: Valve body (1), the valve body (1) includes an inlet pipe (11) and two outlet pipes (12) connected to the inlet pipe (11); There are two valve cores (2). The two valve cores (2) are respectively rotatably installed at the ends of the two outlet pipes (12) that are connected to the inlet pipe (11) to control the flow state of the outlet pipes (12); An adjustment component (3) is installed on the valve body (1) and is used to drive the valve core (2) to rotate in order to adjust the opening of the liquid outlet pipe (12).

2. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 1, characterized in that, The adjustment component (3) includes: The main shaft (31) is rotatably mounted on the valve body (1); A drive unit (32) is mounted on the valve body (1) and is connected to the main shaft (31) for transmission. A limiting component (33) is disposed between the main shaft (31) and the valve body (1) to limit the main shaft (31) from continuing to rotate in the same direction when the outlet pipe (12) is in a normally open or normally closed state.

3. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 2, characterized in that, The limiting component (33) includes: A cylindrical block (331) is fixedly installed on the main shaft (31), and an arc-shaped groove is provided on the side wall of the cylindrical block (331); A limiting member (332) is fixedly installed on the valve body (1), and a limiting piece that is slidably disposed inside the arc-shaped groove is bent on the limiting member (332).

4. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 3, characterized in that, One end of the cylindrical block (331) is provided with an anti-rotation block, and one end of the main shaft (31) is provided with an anti-rotation hole for installing the anti-rotation block, and the bottom end of the anti-rotation hole is threaded with a fastener (333) for fixing the anti-rotation block into the anti-rotation hole.

5. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 2, characterized in that, A housing (4) for mounting the drive component (32) is fixedly installed on the outer side of the valve body (1), and the main shaft (31) includes: The drive section (311) is rotatably disposed inside the housing (4) and is connected to the drive end of the drive component (32) in a transmission manner; A transmission section (312) is connected between the drive section (311) and the valve core (2), and the transmission section (312) is provided with a rotating hole to facilitate the rotation of the transmission section (312).

6. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 5, characterized in that, The bottom of the housing (4) is provided with an inner sleeve (41), and the outer side wall of the valve body (1) is provided with an outer sleeve (13) for installing the inner sleeve (41), and the inner sleeve (41) is threadedly connected with a fastener (131) for fixing to the inside of the outer sleeve (13).

7. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 1, characterized in that, The inlet pipe (11) is provided with two outlet ends (111) for communicating with the outlet pipe (12), and the outlet pipe (12) is detachably installed on the outlet ends (111).

8. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 7, characterized in that, The end of the outlet pipe (12) is fixedly installed with a flange (121) for fixing to the outlet end (111), and a sealing ring (122) is provided between the flange (121) and the outlet end (111).

9. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 8, characterized in that, The flange (121) has a guide sleeve (123) protruding from its side and slidably disposed inside the liquid outlet end (111), and the sealing ring (122) is installed on the outside of the guide sleeve (123).

10. The eccentric double-hemispherical intelligent irrigation regulating valve as described in claim 9, characterized in that, A support shaft (21) is fixedly installed on the valve core (2). A semi-circular hole for installing the support shaft (21) is provided on the inner wall of the liquid outlet end (111). An arc-shaped hole corresponding to the semi-circular hole is provided at the end of the guide sleeve (123). The semi-circular hole and the arc-shaped hole form a guide hole for installing the support shaft (21).