Valve sleeve assembly and hydraulic valve

Abstract

The utility model relates to the technical field of hydraulic valves, and discloses a valve sleeve assembly and a hydraulic valve. The hydraulic valve comprises a valve sleeve assembly, the valve sleeve assembly comprises a first valve sleeve and a second valve sleeve, the first valve sleeve and the second valve sleeve are connected in a fastened mode, a first inner hole is formed in the first valve sleeve, and a second inner hole is formed in the second valve sleeve. A first guide straight section coaxial with the first inner hole is arranged on the first valve sleeve, a second guide straight section coaxial with the second inner hole is arranged on the second valve sleeve, and the first guide straight section is matched with the second guide straight section. Through the cooperation of the first guide straight section and the second guide straight section, the guide correction effect is achieved, so that the matched connection of the first valve sleeve and the second valve sleeve is corrected to be forced to be coaxial, and the first inner hole of the first valve sleeve and the second inner hole of the second valve sleeve are coaxial.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a valve sleeve component and a hydraulic valve. Background Art

[0002] In existing hydraulic valves, it is usually necessary to install the valve core inside the valve sleeve to achieve sealing. However, due to installation problems, the valve sleeve must be made into two parts. The valve core is first installed in the inner hole of the first valve sleeve, and then the second valve sleeve is fastened to the first valve sleeve to seal the valve core inside and realize the action control function of the valve core.

[0003] In the actual processing, valve sleeves generally need to undergo heat treatment, and parts have processing errors before and after heat treatment. That is to say, both valve sleeves are roughly processed and formed before heat treatment, including the fastening and fitting parts of the two valve sleeves (such as threads), and only the internal inner holes are processed after heat treatment. However, since the two sleeves are clamped twice before and after heat treatment, there are positioning errors in the secondary clamping, which makes it difficult to ensure the coaxiality of the inner hole and the fastening and fitting parts of a single valve sleeve. After the two valve sleeves are fastened together, the coaxiality between the inner holes of the two valve sleeves cannot be guaranteed. If the inner holes of the two valve sleeves are not coaxial, it will cause certain difficulties in the movement, reset and sealing of the valve core.

[0004] Therefore, there is an urgent need to provide a valve sleeve assembly and a hydraulic valve to solve the above problems. Utility Model Content

[0005] One purpose of the utility model is to provide a valve sleeve assembly, which can solve the technical problem of non-coaxiality between the inner holes of a first valve sleeve and a second valve sleeve.

[0006] Another object of the utility model is to provide a hydraulic valve, which can solve the technical problem of the misalignment between the inner holes of the first valve sleeve and the second valve sleeve by providing the valve sleeve assembly.

[0007] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0008] A valve sleeve assembly comprises a first valve sleeve and a second valve sleeve, wherein the first valve sleeve is tightly connected to the second valve sleeve, a first inner hole is provided in the first valve sleeve, and a second inner hole is provided in the second valve sleeve;

[0009] The first valve sleeve is provided with a first straight guide section coaxial with the first inner hole, the second valve sleeve is provided with a second straight guide section coaxial with the second inner hole, and the first straight guide section matches with the second straight guide section.

[0010] As an optional solution, the first valve sleeve and the second valve sleeve are fastened by threads.

[0011] As an optional solution, one end of the first valve sleeve close to the second valve sleeve is provided with an internal thread, and one end of the second valve sleeve close to the first valve sleeve is provided with an external thread matching the internal thread.

[0012] As an optional solution, the first guide straight section is protruding from the circumferential side wall of the first inner hole close to the inner thread, and the second guide straight section is provided on the outer circumference of one end of the second valve sleeve close to the first valve sleeve, and the second guide straight section is located on the side of the outer thread close to the first inner hole.

[0013] As an optional solution, the inner diameter of the first straight guide section is smaller than the minor diameter of the internal thread, and the outer diameter of the second straight guide section is smaller than the inner diameter of the first straight guide section.

[0014] As an optional solution, there is a clearance fit between the threads of the first valve sleeve and the threads of the second valve sleeve.

[0015] As an optional solution, the second valve sleeve is constructed as a step structure to form a limiting surface, and the end surface of the first valve sleeve can abut against the limiting surface.

[0016] A hydraulic valve comprises a valve core and the above-mentioned valve sleeve assembly, wherein the valve core is arranged in the valve sleeve assembly.

[0017] As an optional solution, the first inner hole includes a first hole and a second hole that are coaxially connected, the aperture of the first hole is larger than the aperture of the second hole, and a first oil port and a second oil port are provided on the outer wall of the valve sleeve assembly, the first oil port is connected to the first hole, and the second oil port is connected to the second hole;

[0018] The valve core includes a valve stem and a valve core body connected to each other, the valve stem is located in the second hole, the valve core body is located in the first hole, and the valve core can move axially along the first inner hole to switch between a first position and a second position; when in the first position, the valve core body blocks the orifice of the second hole, and the first oil port is connected to the second inner hole; when in the second position, the valve core body blocks the orifice of the second inner hole, and the second oil port is connected to the first oil port.

[0019] As an optional solution, conical sealing surfaces are provided at both axial ends of the valve core body.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides a valve sleeve assembly, comprising a first valve sleeve and a second valve sleeve, wherein a first inner hole and a first guide straight section on the first valve sleeve are coaxially arranged, and a second inner hole and a second guide straight section on the second valve sleeve are coaxially arranged. When the first valve sleeve and the second valve sleeve are matched and connected, the first guide straight section cooperates with the second guide straight section to play a guiding correction role, so as to correct the connection between the first valve sleeve and the second valve sleeve to force them to be coaxial. Therefore, through the correction of the guide straight section, the first inner hole of the first valve sleeve and the second inner hole of the second valve sleeve can be made coaxial.

[0022] The utility model also provides a hydraulic valve, which can ensure that the first inner hole of the first valve sleeve and the second inner hole of the second valve sleeve are coaxial by arranging the valve sleeve assembly, thereby solving the problems of valve core movement, resetting and sealing difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to explain the embodiments of the utility model or the technical solutions in the prior art more clearly and easily, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of the hydraulic valve provided by the embodiment of the utility model in the first state;

[0025] Figure 2 It is a structural schematic diagram of the hydraulic valve provided by the embodiment of the utility model in the second state;

[0026] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0027] In the figure:

[0028] 10. Valve sleeve assembly; 11. First valve sleeve; 111. First inner hole; 1111. First hole; 1112. Second hole; 112. First guide straight section; 113. Internal thread; 114. Chamfer; 115. First oil port; 116. Second oil port; 12. Second valve sleeve; 121. Second inner hole; 122. Second guide straight section; 123. External thread; 124. Limiting surface;

[0029] 20. valve core; 21. valve stem; 22. valve core body; 221. conical sealing surface;

[0030] 30. Magnetic sleeve; 40. Moving iron; 50. Push rod; 60. Spring; 70. Spring seat. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] Embodiment 1

[0036] This embodiment provides a valve sleeve assembly 10 and a hydraulic valve using the valve sleeve assembly 10, wherein the hydraulic valve can be a solenoid reversing valve, a one-way valve, a pressure reducing valve or other hydraulic valve structure, which is not specifically limited here. Figure 2 and Figure 3As shown, the hydraulic valve includes a valve core 20 and the above-mentioned valve sleeve assembly 10, the valve sleeve assembly 10 includes a first valve sleeve 11 and a second valve sleeve 12, the first valve sleeve 11 is fastened to the second valve sleeve 12, the first valve sleeve 11 is provided with a first inner hole 111, the second valve sleeve 12 is provided with a second inner hole 121, the valve core 20 is provided in the first inner hole 111 and can move along the axial direction of the first inner hole 111, so that the valve core 20 can be switched between a position of sealing the first inner hole 111 and a position of sealing the second inner hole 121, thereby realizing the conduction, cutoff or switching of the oil circuit of the fluid. In an optional embodiment, the first valve sleeve 11 and the second valve sleeve 12 are fastened by threads. In another optional embodiment, the first valve sleeve 11 and the second valve sleeve 12 can also be fastened by fasteners such as a wire retaining ring. This embodiment is described by taking the threaded connection between the first valve sleeve 11 and the second valve sleeve 12 as an example.

[0037] When assembling the valve core 20, first install the valve core 20 in the first inner hole 111 of the first valve sleeve 11, and then thread the second valve sleeve 12 onto the first valve sleeve 11 to seal the valve core 20 inside, thereby realizing the action control function of the valve core 20, and the installation is convenient and quick.

[0038] In the actual processing, both the first valve sleeve 11 and the second valve sleeve 12 need to be heat treated to improve the mechanical properties of the material and the cutting processability of the metal. That is to say, the first valve sleeve 11 is roughly machined into shape, including the thread, before heat treatment, and only the first inner hole 111 is processed after heat treatment. However, due to the secondary clamping before and after heat treatment, there is a positioning error in the secondary clamping, which makes it difficult to ensure the coaxiality of the thread and the first inner hole 111 of the first valve sleeve 11; the second valve sleeve 12 is similarly machined into shape, including the thread, before heat treatment, and only the second inner hole 121 is processed after heat treatment. However, due to the secondary clamping before and after heat treatment, it is difficult to ensure the coaxiality of the thread and the second inner hole 121 of the second valve sleeve 12. In this way, after the first valve sleeve 11 and the second valve sleeve 12 are threadedly connected together, the coaxiality of the first inner hole 111 and the second inner hole 121 cannot be guaranteed. If the first inner hole 111 and the second inner hole 121 are not coaxial, it will cause certain difficulties in the movement, resetting and sealing of the valve core 20.

[0039] In order to solve the above problems, Figure 3As shown, the first valve sleeve 11 is provided with a first straight guide section 112 coaxial with the first inner hole 111, and the second valve sleeve 12 is provided with a second straight guide section 122 coaxial with the second inner hole 121, and the first straight guide section 112 matches with the second straight guide section 122. The first straight guide section 112 and the first inner hole 111 on the first valve sleeve 11 are formed by clamping and processing once after heat treatment, so the coaxiality is good, and the second straight guide section 122 and the second inner hole 121 on the second valve sleeve 12 are also formed by clamping and processing once after heat treatment, so the coaxiality is also good. Therefore, when the first valve sleeve 11 and the second valve sleeve 12 are threadedly matched, the first guide straight section 112 and the second guide straight section 122 cooperate with each other to play a guiding correction role, so as to correct the threaded connection between the first valve sleeve 11 and the second valve sleeve 12 so that the two are forced to be coaxial. Therefore, through the correction of the guide straight section, the first inner hole 111 of the first valve sleeve 11 and the second inner hole 121 of the second valve sleeve 12 can be made coaxial, thereby solving the problem of difficulty in movement, resetting and sealing of the valve core 20, and the different axes of the two threads are adaptively adjusted through the gap between the threads.

[0040] In an optional embodiment, if Figure 3 As shown, an end of the first valve sleeve 11 close to the second valve sleeve 12 is provided with an internal thread 113, that is, an end of the first valve sleeve 11 close to the second valve sleeve 12 is provided with a threaded hole for the second valve sleeve 12 to be plugged in and matched, and an end of the second valve sleeve 12 close to the first valve sleeve 11 is provided with an external thread 123 matched with the internal thread 113. In this embodiment, the second valve sleeve 12 is plugged into the threaded hole of the first valve sleeve 11, and the external thread 123 of the second valve sleeve 12 is fastened by matching with the internal thread 113 of the first valve sleeve 11.

[0041] On this basis, combined with Figure 3 The first straight guide section 112 is protrudingly provided on the circumferential side wall of the first inner hole 111 close to the internal thread 113, and the second straight guide section 122 is provided on the outer circumference of one end of the second valve sleeve 12 close to the first valve sleeve 11, and the second straight guide section 122 is located on the side of the external thread 123 close to the first inner hole 111. When installing the second valve sleeve 12, first insert one end of the second valve sleeve 12 into the first valve sleeve 11, and then screw the second valve sleeve 12 so that the external thread 123 of the second valve sleeve 12 cooperates with the internal thread 113 of the first valve sleeve 11. After screwing to a certain position, the second guide straight section 122 on the second valve sleeve 12 cooperates with the first guide straight section 112 in the first valve sleeve 11, and then continue to screw the second valve sleeve 12. During the screwing process, the threaded connection between the first valve sleeve 11 and the second valve sleeve 12 can be corrected through the cooperation of the second guide straight section 122 and the first guide straight section 112 so that the two are forced to be coaxial, and finally the first inner hole 111 of the first valve sleeve 11 and the second inner hole 121 of the second valve sleeve 12 are coaxial, and the different axes of the threads of the two are adaptively adjusted through the gap between the threads.

[0042] In another optional embodiment, the second valve sleeve 12 can also be mounted outside the first valve sleeve 11, that is, the end of the first valve sleeve 11 close to the second valve sleeve 12 is provided with an external thread 123, and the end of the second valve sleeve 12 close to the first valve sleeve 11 is provided with an internal thread 113 matching the external thread 123, which can also achieve the above-mentioned fastening connection effect and will not be repeated here.

[0043] In an optional embodiment, the internal thread 113 of the first valve sleeve 11 and the external thread 123 of the second valve sleeve 12 are clearance-fitted. It should be noted that, under normal circumstances, the normal clearance fit between the internal thread 113 and the external thread 123 can meet the requirements of adaptive adjustment, but if the internal thread 113 and the external thread 123 are not processed well, assembly difficulties may occur. At this time, it is necessary to adaptively increase the fitting clearance between the internal thread 113 and the external thread 123 to improve the assembly, thereby increasing the adaptive adjustment ability between the internal thread 113 and the external thread 123, and avoiding jamming due to over-constraint between the internal thread 113 and the external thread 123 during the correction process. In another optional embodiment, the adaptive adjustment ability between the internal thread 113 and the external thread 123 can also be improved by appropriately shortening the axial length of the internal thread 113 and the external thread 123. In another optional embodiment, if space permits, the distance between the leftmost end of the second guide straight section 122 and the external thread 123 can be increased by increasing the axial length of the second guide straight section 122, thereby improving the adaptive adjustment capability between the internal thread 113 and the external thread 123.

[0044] In an optional embodiment, if Figure 3 As shown, the inner diameter of the first straight guide section 112 is smaller than the minor diameter of the internal thread 113, and the outer diameter of the second straight guide section 122 is slightly smaller than the inner diameter of the first straight guide section 112. This arrangement makes it easier and tighter for the first straight guide section 112 and the second straight guide section 122 to fit together, and the coaxiality of the first valve sleeve 11 and the second valve sleeve 12 is increased through the mutual cooperation between the first straight guide section 112 and the second straight guide section 122. In an optional embodiment, as Figure 3 As shown, a chamfer 114 is provided at one end of the first valve sleeve 11 close to the second valve sleeve 12, and the chamfer 114 is arranged around the edge of the opening of the first valve sleeve 11. By providing the chamfer 114, the end of the second valve sleeve 12 can be quickly inserted into the first valve sleeve 11, and the operation is convenient and quick.

[0045] In an optional embodiment, if Figure 3As shown, the second valve sleeve 12 is constructed as a step structure to form a limit surface 124, and the end surface of the first valve sleeve 11 can abut against the limit surface 124. In the above arrangement, the limit surface 124 can play a limiting role. When the limit surface 124 of the second valve sleeve 12 abuts against the end surface of the first valve sleeve 11 during the process of screwing the second valve sleeve 12, it means that the second valve sleeve 12 is installed in place.

[0046] Embodiment 2

[0047] This embodiment provides a hydraulic valve, and the hydraulic valve uses the valve sleeve assembly 10 in Embodiment 1. In this embodiment, the hydraulic valve is an electromagnetic reversing valve as an example for description.

[0048] like Figure 1 As shown, the electromagnetic reversing valve includes a valve core 20 and a valve sleeve assembly 10 in the first embodiment, and the valve core 20 is arranged in the inner hole of the valve sleeve assembly 10. Specifically, the electromagnetic reversing valve also includes a magnetic sleeve 30, which is threadedly connected to the end of the first valve sleeve 11 away from the second valve sleeve 12, and a movable moving iron 40 is arranged in the magnetic sleeve 30, and the moving iron 40 abuts against the valve core 20 through a push rod 50. The electromagnetic reversing valve also includes a spring 60 and a spring seat 70, the spring seat 70 is fixedly connected to the end of the valve core 20 away from the second valve sleeve 12, the spring 60 is sleeved on the valve core 20, and one end of the spring 60 abuts against the spring seat 70, and the other end abuts against the first valve sleeve 11.

[0049] Combination Figure 2 and Figure 3 As shown, the first inner hole 111 of the first valve sleeve 11 includes a first hole 1111 and a second hole 1112 that are coaxially connected. The aperture of the first hole 1111 is larger than the aperture of the second hole 1112. The outer wall of the second valve sleeve 12 of the valve sleeve assembly 10 is provided with a first oil port 115 and a second oil port 116. The first oil port 115 is connected to the first hole 1111, and the second oil port 116 is connected to the second hole 1112. The valve core 20 includes a valve stem 21 and a valve core body 22 connected to each other. The valve stem 21 is located in the second hole 1112, the valve core body 22 is located in the first hole 1111, and the valve core 20 can move axially along the first inner hole 111 to switch between the first position and the second position; in the first position, the valve core body 22 blocks the orifice of the second hole 1112, and the first oil port 115 is connected with the second inner hole 121; in the second position, the valve core body 22 blocks the orifice of the second inner hole 121, and the second oil port 116 is connected with the first oil port 115.

[0050] like Figure 1As shown, when the coil (not shown) of the electromagnetic reversing valve is not energized, the valve core 20 is pushed to move to the left by the spring 60, so that the valve core 20 is located in the first position. At this time, the valve core body 22 seals the orifice of the second hole 1112 and opens the orifice of the second inner hole 121, so that the first oil port 115 and the second oil port 116 are cut off, and the first oil port 115 is connected to the second inner hole 121. The oil can flow to the first oil port 115 through the second inner hole 121, or flow to the second inner hole 121 through the first oil port 115; Figure 2 and Figure 3 As shown, when the coil is energized, the moving iron 40 and the magnetic sleeve 30 are magnetized and attract each other, and the moving iron 40 pushes the valve core 20 to move to the right through the push rod 50 to overcome the elastic force of the spring 60, so that the valve core 20 switches to the second position. At this time, the valve core body 22 seals the orifice of the second inner hole 121 and opens the orifice of the second hole 1112 to cut off the first oil port 115 and the second inner hole 121, and the second oil port 116 is connected to the first oil port 115. The oil can flow to the first oil port 115 through the second oil port 116, or flow to the second oil port 116 through the first oil port 115, so as to realize the switching of the oil circuit.

[0051] It can be seen that the hydraulic valve in this embodiment, by setting the valve sleeve assembly 10 in Example 1, can ensure that the first inner hole 111 of the first valve sleeve 11 and the second inner hole 121 of the second valve sleeve 12 are coaxial, thereby ensuring the smoothness of the movement and switching of the valve core 20 and ensuring the sealing performance of the valve core 20.

[0052] In an optional implementation, if Figure 3 As shown, both axial ends of the valve core body 22 are provided with a conical sealing surface 221. When the valve core body 22 seals the opening of the second hole 1112, the conical sealing surface 221 at one end of the valve core body 22 contacts the opening of the second hole 1112 to form a seal, and the sealing surface is a line contact seal formed by the annular line and the conical surface, and the sealing effect is good. When the valve core body 22 seals the opening of the second inner hole 121, the conical sealing surface 221 at the other end of the valve core body 22 contacts the opening of the second inner hole 121 to form a seal, and the sealing surface is also a line contact seal formed by the annular line and the conical surface, and the sealing effect is good.

[0053] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A valve sleeve assembly, characterized in that: The valve comprises a first valve sleeve (11) and a second valve sleeve (12), wherein the first valve sleeve (11) is fixedly connected to the second valve sleeve (12), a first inner hole (111) is provided in the first valve sleeve (11), and a second inner hole (121) is provided in the second valve sleeve (12); The first valve sleeve (11) is provided with a first straight guide section (112) coaxial with the first inner hole (111), and the second valve sleeve (12) is provided with a second straight guide section (122) coaxial with the second inner hole (121), and the first straight guide section (112) and the second straight guide section (122) cooperate with each other.

2. The valve sleeve assembly according to claim 1, characterized in that: The first valve sleeve (11) and the second valve sleeve (12) are fastened together by threads.

3. The valve sleeve assembly according to claim 2, characterized in that: An end of the first valve sleeve (11) close to the second valve sleeve (12) is provided with an internal thread (113), and an end of the second valve sleeve (12) close to the first valve sleeve (11) is provided with an external thread (123) matching the internal thread (113).

4. The valve sleeve assembly according to claim 3, characterized in that: The first guide straight section (112) is protrudingly provided on the circumferential side wall of one end of the first inner hole (111) close to the internal thread (113), and the second guide straight section (122) is provided on the outer circumference of one end of the second valve sleeve (12) close to the first valve sleeve (11), and the second guide straight section (122) is located on a side of the external thread (123) close to the first inner hole (111).

5. The valve sleeve assembly according to claim 3, characterized in that: The inner diameter of the first straight guide section (112) is smaller than the minor diameter of the internal thread (113), and the outer diameter of the second straight guide section (122) is smaller than the inner diameter of the first straight guide section (112).

6. The valve sleeve assembly according to claim 2, characterized in that: There is a clearance fit between the thread of the first valve sleeve (11) and the thread of the second valve sleeve (12).

7. The valve sleeve assembly according to any one of claims 1 to 6, characterized in that: The second valve sleeve (12) is constructed as a step structure to form a limiting surface (124), and the end surface of the first valve sleeve (11) can abut against the limiting surface (124).

8. A hydraulic valve, characterized in that: It comprises a valve core (20) and a valve sleeve assembly according to any one of claims 1 to 7, wherein the valve core (20) is arranged in the valve sleeve assembly.

9. The hydraulic valve according to claim 8, characterized in that: The first inner hole (111) comprises a first hole (1111) and a second hole (1112) which are coaxially connected, the diameter of the first hole (1111) is larger than the diameter of the second hole (1112), and a first oil port (115) and a second oil port (116) are provided on the outer wall of the valve sleeve assembly, the first oil port (115) is connected to the first hole (1111), and the second oil port (116) is connected to the second hole (1112); The valve core (20) comprises a valve stem (21) and a valve core body (22) connected to each other, wherein the valve stem (21) is located in the second hole (1112), and the valve core body (22) is located in the first hole (1111), and the valve core (20) can move axially along the first inner hole (111) to switch between a first position and a second position; when in the first position, the valve core body (22) blocks the orifice of the second hole (1112), and the first oil port (115) is communicated with the second inner hole (121); when in the second position, the valve core body (22) blocks the orifice of the second inner hole (121), and the second oil port (116) is communicated with the first oil port (115).

10. The hydraulic valve according to claim 9, characterized in that Conical sealing surfaces (221) are provided at both axial ends of the valve core body (22).

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