Intelligent hydraulic valve for hydraulic system

Abstract

The application relates to the technical field of hydraulic equipment, in particular to an intelligent hydraulic valve for a hydraulic system, which comprises a hydraulic valve body, an inlet pipe, a support pipe, an outlet pipe, a cover body and a sealing part. One end of the inlet pipe is communicated with the bottom of the hydraulic valve body, and the other end is communicated with a liquid tank. The support pipe is arranged on the top of the hydraulic valve body and is communicated with the inner cavity of the hydraulic valve body. One end of the outlet pipe is communicated with the support pipe, and the other end is communicated with the liquid tank. The cover body is arranged on the top of the support pipe and is used for plugging the upper end opening of the support pipe. The plugging rod is movably arranged in the pipe cavity of the support pipe. One end of the elastic part is connected with the upper end of the plugging rod, and the other end is connected with the cover body. One end of the sealing part is connected with the cover body, and the other end is abutted against the inner side wall of the support pipe. The elastic part arranged in the application can ensure that the plugging rod always moves in a single direction relative to the support pipe, so that the wear of the plugging rod and the support pipe can be ignored.

Description

Technical Field

[0001] This invention relates to the field of hydraulic equipment technology, and in particular to an intelligent hydraulic valve for hydraulic systems. Background Technology

[0002] Intelligent hydraulic valves are a new generation of hydraulic power control components that deeply integrate "mechanical-hydraulic-electronic-control-information". Essentially, they embed sensors, microprocessors, and high-speed communication interfaces into traditional hydraulic valves, enabling the valve itself to possess intelligent functions such as state perception, real-time decision-making, closed-loop compensation, fault diagnosis, and remote interaction. By replacing part of the hardware circuit with software algorithms, it can adaptively adjust pressure, flow rate, and flow direction according to operating conditions, achieving high-precision, energy-saving, and predictive maintenance hydraulic control. Intelligent hydraulic valves are the core control components of hydraulic systems, achieving high-precision control of the actuator's direction of movement, speed, and load protection by adjusting the pressure, flow rate, and flow direction of the hydraulic fluid. The pressure relief valve in an intelligent hydraulic valve is used to prevent pipe bursts due to excessive system pressure. However, in existing pressure relief valves, the valve core and seat move relative to each other during pressure relief. Because the sealing surfaces often use a contact design, wear or damage to the seals, valve core, and valve seat can easily occur after prolonged operation, leading to leakage problems. This not only affects system performance but may also cause safety hazards. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides an intelligent hydraulic valve for a hydraulic system, comprising:

[0004] Hydraulic valve body;

[0005] The inlet pipe is connected at one end to the bottom of the hydraulic valve body and at the other end to the liquid tank.

[0006] A support tube is located at the top of the hydraulic valve body and communicates with the inner cavity of the hydraulic valve body;

[0007] One end of the liquid outlet pipe is connected to the support pipe, and the other end is connected to the liquid tank.

[0008] A cover is provided at the top of the support tube and is used to seal the upper opening of the support tube;

[0009] The sealing rod is movably disposed within the cavity of the support tube;

[0010] The elastic part is connected at one end to the upper end of the sealing rod and at the other end to the cover.

[0011] The sealing part is connected to the cover body at one end and abuts against the inner wall of the support tube at the other end. The sealing part covers the sealing rod and the elastic part.

[0012] Specifically, when the liquid inside the hydraulic valve body is at a first preset pressure, the sealing rod is in the first position, and the sealing part closes the outlet pipe; when the liquid inside the hydraulic valve body is at a second preset pressure, the sealing rod is in the second position, and the sealing part moves upward to open the outlet pipe.

[0013] Optionally, the support tube includes a first cavity and a second cavity, the first cavity being located below the second cavity, the size of the first cavity being smaller than the size of the second cavity, the sealing rod being movably inserted into the first cavity and the second cavity, and a first gap existing between the sealing rod and the first cavity, the size of the first gap being between 0.01mm and 0.05mm, and a second gap existing between the sealing rod and the second cavity, the size of the second gap being between 2cm and 10cm.

[0014] Optionally, the elastic portion includes:

[0015] An elastic rod is provided at the upper end of the sealing rod;

[0016] An elastic cylinder is provided on the lower end face of the cover, and the elastic cylinder is movably sleeved outside the elastic rod;

[0017] A spring is wound around the elastic rod, and the two ends of the spring are respectively fixedly connected to the side wall of the elastic rod and the outer side wall of the elastic cylinder.

[0018] Optionally, the sealing portion includes:

[0019] A sealing plug is fixedly sleeved outside the sealing rod, and the sealing plug is movably disposed inside the second cavity and is slidably connected to the cavity wall of the second cavity;

[0020] An elastic tube is fixedly connected at its lower end to the upper end face of the sealing plug. The elastic tube covers the sealing rod and is fixedly connected at its upper end to the lower end face of the elastic pad. The elastic pad is fixedly connected to the lower end face of the cover body, and part of the elastic pad is located between the support tube and the cover body.

[0021] Optionally, the support tube has a first step and a second step. The first step is located at the top of the support tube and is disposed in contact with the elastic pad. The second step is located below the first step and inside the support tube. The lower end of the sealing plug is disposed in contact with the second step.

[0022] Optionally, it also includes a pressure relief hole, which is opened on the support tube. One end of the pressure relief hole is located on the second step, and the other end is located on the outer wall of the support tube. The pressure relief hole is used to connect the liquid outlet tube with the second lumen.

[0023] Optionally, the pressure relief hole has an L-shaped structure, and the vertical section of the pressure relief hole includes a trumpet-shaped pipe section and a straight pipe section, with the straight pipe section located below the trumpet-shaped section.

[0024] Optionally, it also includes a sealing part, which is disposed on the lower end face of the sealing plug and is movably disposed within the pressure relief hole.

[0025] Optionally, the sealing part includes a funnel-shaped column section, a straight column section, and a triangular section. The straight column section is located above the funnel-shaped column section, and the triangular section is located below the funnel-shaped column section. Both the funnel-shaped column section and the straight column section are located inside the funnel-shaped pipe section, and the funnel-shaped pipe section and the funnel-shaped column section are matched and arranged to match each other. The triangular section is located inside the straight pipe section.

[0026] Optionally, it also includes screws, which are threadedly connected to a first screw hole, a second screw hole and a third screw hole respectively. The first screw hole is located on the cover, the second screw hole is located on the support tube, and the third screw hole is located on the elastic pad. The screws are used to fix the support tube to the cover and to hold the elastic pad between the support tube and the cover.

[0027] The beneficial effects of this invention are as follows:

[0028] The support tube, outlet tube, cover, sealing rod, elastic part and sealing part of the present invention form a combination structure with similar function to a pressure relief valve. The difference between this combination structure and the existing pressure relief valve is that it adopts a separate sealing method, so there is no risk of leakage even if wear occurs. At the same time, the elastic part can ensure that the sealing rod always moves in a unidirectional direction relative to the support tube, so that the wear of the sealing rod and the support tube can be ignored. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an embodiment of the intelligent hydraulic valve for the hydraulic system of the present invention;

[0030] Figure 2 This invention relates to an intelligent hydraulic valve for hydraulic systems. Figure 1 Enlarged schematic diagram of structure A in the middle;

[0031] Figure 3 This invention relates to an intelligent hydraulic valve for hydraulic systems. Figure 1 A cross-sectional view of the pressure relief valve;

[0032] Figure 4 This invention relates to an intelligent hydraulic valve for hydraulic systems. Figure 3 Enlarged schematic diagram of the B-structure;

[0033] Figure 5This is a schematic diagram of the sealing part of the intelligent hydraulic valve for the hydraulic system of the present invention, which is located on the sealing plug and used to seal the pressure relief hole;

[0034] Figure 6 This is a schematic diagram of the structure in which the sealing part and the pressure relief hole are installed in the intelligent hydraulic valve of the hydraulic system of the present invention.

[0035] Explanation of reference numerals in the attached figures

[0036] Hydraulic valve body 1, liquid tank 2, inlet pipe 3, support pipe 4, outlet pipe 5, cover 6, screw 61, pressure relief hole 7, sealing rod 8, elastic part 9, elastic rod 91, elastic cylinder 92, spring 93, sealing part 10, sealing plug 101, elastic tube 102, elastic pad 103, sealing part 11. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but do not exclude other elements or objects.

[0038] Intelligent hydraulic valves are electromechanical-hydraulic integrated core components that integrate sensors, microprocessors, and communication modules into traditional hydraulic valves. They can monitor parameters such as pressure and flow in real time and make autonomous decisions to achieve high-precision, adaptive, and zero-leakage control.

[0039] To address the problems existing in the prior art, embodiments of the present invention provide an intelligent hydraulic valve for hydraulic systems. The present invention improves the structure of existing pressure relief valves by adding a combined structure of a support pipe 4, a cover 6, a sealing rod 8, an elastic part 9, and a sealing part 10. This combined structure replaces the pressure relief valve in existing equipment. In actual use, this combined structure can prevent equipment wear, extend the service life of the equipment, and avoid leakage caused by seal wear. Moreover, the combined structure is rationally designed so that even if the seal wears, leakage will not occur.

[0040] Furthermore, the innovative structure of this invention can not only be used in hydraulic systems, but also seamlessly adapt to extreme working conditions such as wind turbine pitch control, aircraft steering gear, and deep-sea wellheads. With its zero-leakage design of "independent sealing + unidirectional wear compensation", the maintenance cycle is extended from annual to ten-year cycle, reducing hydraulic oil leakage by 50 liters per unit per year. It is certified by both DNV and military standards, and has both digital twin interface and energy recovery expansion capabilities, providing a highly reliable, long-life, and low-emission integrated pressure control solution for hydraulic equipment worldwide.

[0041] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, the intelligent hydraulic valve for the hydraulic system of the present invention includes: a hydraulic valve body 1;

[0042] One end of the inlet pipe 3 (which can be understood as the upper end) is connected to the bottom of the hydraulic valve body 1, and the other end (which can be understood as the lower end) is connected to the liquid tank 2 (in one example, it can be understood as an oil tank); during operation, liquid enters the hydraulic valve body 1 from the liquid tank 2 through the inlet pipe 3; the upper end of the hydraulic valve body 1 is also provided with a delivery pipe, through which the liquid is delivered to the functional equipment.

[0043] The support pipe 4 is located at the top of the hydraulic valve body 1 and communicates with the inner cavity of the hydraulic valve body 1. One end (which can be understood as the upper end) of the outlet pipe 5 is connected to the support pipe 4, and the other end (which can be understood as the lower end) is connected to the liquid tank 2.

[0044] A cover 6 is located at the top of the support tube 4 and is used to seal the upper opening of the support tube 4. A sealing rod 8 is movably disposed within the cavity of the support tube 4; one end (which can be understood as the lower end) of the elastic part 9 is connected to the upper end of the sealing rod 8, and the other end (which can be understood as the lower end) is connected to the cover 6; one end (which can be understood as the upper end) of the sealing part 10 is connected to the cover 6, and the other end (which can be understood as the lower end) abuts against the inner wall of the support tube 4, and the sealing part 10 covers the sealing rod 8 and the elastic part 9. Specifically, when the liquid in the hydraulic valve body 1 is at a first preset pressure (below a preset threshold), the sealing rod 8 is in the first position, and the sealing part 10 closes the outlet pipe 5; when the liquid in the hydraulic valve body 1 is at a second preset pressure (above a preset threshold), the sealing rod 8 is in the second position, and the sealing part 10 moves upward to open the outlet pipe 5.

[0045] In one implementation, such as Figure 3 As shown, the support tube 4 includes a first cavity (unlabeled) and a second cavity (unlabeled); the first cavity is located below the second cavity. In one example, the first cavity can be understood as the lower cavity; the second cavity can be understood as the upper cavity.

[0046] Furthermore, the size of the first cavity is smaller than that of the second cavity, the sealing rod 8 is movably inserted into the first cavity and the second cavity, and there is a first gap between the sealing rod 8 and the first cavity. The size of the first gap is between 0.01mm and 0.05mm. The purpose of this setting is to ensure that the gap between the sealing rod 8 and the first cavity is almost negligible.

[0047] A second gap exists between the sealing rod 8 and the second cavity, with the size of the second gap ranging from 2cm to 10cm. By enlarging the second gap to 2-10cm, which is much larger than the first gap of only 0.01-0.05mm, the second cavity forms a low-resistance relief channel: providing instantaneous high-flow-rate pressure relief space when the sealing rod is raised, while avoiding impurities from getting stuck and absorbing pressure pulsations, and reducing the requirements for processing precision. This, together with the precision seal of the first gap, forms a "one-sealed, one-releasing" graded cooperation, achieving both zero leakage and high flow rate.

[0048] In one implementation, such as Figure 3 As shown, the elastic part 9 includes: an elastic rod 91 disposed at the upper end of the sealing rod 8; an elastic cylinder 92 disposed on the lower end face of the cover 6, the elastic cylinder 92 being movably sleeved outside the elastic rod 91; and a spring 93 wound around the elastic rod 91, the two ends of the spring 93 being fixedly connected to the side wall of the elastic rod 91 and the outer side wall of the elastic cylinder 92, respectively. In this example, the "elastic rod + elastic cylinder + outer spring" are coaxially nested. Compared with only a single spring, the lateral force, torsional force, and bending moment can all be contained within the precision guide pair of the elastic cylinder-rod pair. The spring only bears the pure axial load, thereby eliminating eccentric wear, ensuring that the sealing rod always moves along a single axis, significantly improving long-term displacement accuracy and sealing life, and reducing the risk of spring fatigue failure.

[0049] In one implementation, such as Figure 3 As shown, the sealing part 10 includes: a sealing plug 101 fixedly sleeved outside the sealing rod 8, the sealing plug 101 being movably disposed inside the second tube cavity and slidably connected to the cavity wall of the second tube cavity; an elastic tube 102 with its lower end fixedly connected to the upper end surface of the sealing plug 101, the elastic tube 102 covering the sealing rod 8, its upper end fixedly connected to the lower end surface of the elastic pad 103, the elastic pad 103 being fixedly connected to the lower end surface of the cover 6, and a portion of the elastic pad 103 being disposed between the support tube 4 and the cover 6.

[0050] In this embodiment, the sealing part 10 is designed as a three-layer linkage assembly of "sealing plug 101 + elastic tube 102 + elastic gasket 103". The core purpose is to completely decouple "wear" and "leakage" to achieve redundant sealing of "wearable - zero leakage". Specifically:

[0051] The sealing plug 101 only slides axially, while radial positioning is provided by the second cavity wall. The frictional force is unidirectional, and wear is concentrated on the outer edge of the sealing plug 101. The elastic tube 102 and the elastic pad 103, as flexible compensation elements, do not participate in sliding, thus avoiding the rotational and shearing wear of traditional O-rings or valve sealing surfaces. The elastic tube 102 is made of a high-resilience fatigue-resistant material, which absorbs and rebounds the minute wear displacement (μm level) of the sealing plug 101 in real time, ensuring that the sealing line always fits, forming the first "dynamic compensation" barrier.

[0052] The elastic gasket 103 is pre-compressed between the cover 6 and the support tube 4 by the screw, forming a static end face seal. Even if the sealing plug 101 develops circumferential wear due to long-term operation, the elastic gasket 103 can still continue to compress the elastic tube 102 through its own compression, maintaining a second "static redundancy" seal. The elastic tube 102 and the elastic gasket 103 are bonded together without gaps, forming a continuous "soft-soft" sealing chain, eliminating the microscopic leakage channels of traditional hard-hard fits.

[0053] Wear debris from the sealing plug 101 and the second cavity wall is completely covered by the elastic tube 102, preventing it from entering the first cavity and the main oil circuit of the system, thus avoiding accelerated wear caused by secondary grinding. The elastic pad 103 forms a "labyrinth + compression" double barrier between the cover 6 and the support tube 4. Even if a very small amount of liquid breaks through the sealing plug 101, it will be intercepted again in the compression zone of the elastic pad 103, achieving "internal leakage without external discharge".

[0054] The elastic pad 103 forms a "maze + compression" double barrier between the cover 6 and the support tube 4. Even if a very small amount of liquid breaks through the sealing plug 101, it will be intercepted again in the compression area of ​​the elastic pad 103, achieving "internal leakage without external discharge".

[0055] In one implementation, such as Figure 3 As shown, the support tube 4 has a first step (not shown) and a second step (not shown). The first step is located at the top of the support tube 4 and is in contact with the elastic pad 103. The second step is located below the first step and inside the support tube 4. The lower end of the sealing plug 101 is in contact with the second step.

[0056] In this embodiment, the first step inside the support tube 4 provides a rigid stop for the elastic pad 103, ensuring that the elastic pad 103 obtains a uniform and constant compression amount when the screw is tightened, forming a reliable end face seal; the second step sets a precise axial lower limit for the sealing plug 101, so that it always maintains a preset sealing force with the pressure relief hole 7 under low pressure or no pressure, and at the same time serves as a hard limit for the pressure relief opening stroke, thereby coaxially positioning the elastic pad 103, sealing plug 101 and sealing rod 8 at one time, which simplifies assembly and ensures long-term repeatability accuracy.

[0057] In one implementation, such as Figure 3 As shown, the intelligent hydraulic valve for the hydraulic system of the present invention also includes a pressure relief hole 7. The pressure relief hole 7 is opened on the support pipe 4. One end (which can be understood as the upper end) of the pressure relief hole 7 is located on the second step, and the other end (which can be understood as the lower end) is located on the outer side wall of the support pipe 4. The pressure relief hole 7 is used for the connection between the liquid outlet pipe 5 and the second pipe cavity.

[0058] In this embodiment, the pressure relief hole 7 is directly opened on the second step and connected to the liquid outlet pipe 5, so that the pressure relief hole 7 is sealed when the sealing plug 101 is sealed on the step surface. Once the pressure exceeds the limit and is pushed up, the orifice is exposed instantly, forming the shortest and most flexible relief channel. This ensures rapid unloading and avoids the eddy currents and energy loss caused by traditional side holes. At the same time, the step also serves as the sealing surface and the orifice cutting edge, simplifying the structure and reducing the volume.

[0059] In one implementation, such as Figure 3 As shown, the pressure relief hole 7 has an L-shaped structure, and the vertical section of the pressure relief hole 7 includes a trumpet-shaped pipe section and a straight pipe section, with the straight pipe section located below the trumpet-shaped section. In this embodiment, the pressure relief hole 7 is made into an "L"-shaped composite channel with the vertical section consisting of a trumpet shape followed by a straight pipe. This allows the flow area to be expanded by the trumpet opening when the sealing plug 101 is opened, reducing jet impact and noise. Subsequently, the straight pipe section maintains a stable flow guidance, achieving rapid pressure relief while reducing eddies, cavitation, and energy loss, and preventing impurities from depositing at the orifice.

[0060] In one implementation, such as Figure 5As shown, the intelligent hydraulic valve for the hydraulic system also includes a sealing part 11, which is disposed on the lower end face of the sealing plug 101 and is movably disposed within the pressure relief hole 7. In this embodiment, a sealing part 11 that can extend into the pressure relief hole 7 is added to the lower end face of the sealing plug 101, so that it forms a double line-surface fit with the horn-straight section inside the hole when closed, and automatically aligns using the hole wall guide. This achieves zero-leakage sealing under low pressure and can simultaneously detach with the overall lifting of the sealing plug when opened, avoiding the delay of overcoming local adhesion forces required by traditional valve cores, shortening response time and reducing wear. Thus, the two functions of "sealing" and "pressure relief" are integrated into the same moving part, simplifying the structure and improving long-term reliability.

[0061] Furthermore, such as Figure 5 and Figure 6 As shown, the sealing part 11 includes a trumpet-shaped column section, a straight column section and a triangular section. The straight column section is located above the trumpet-shaped column section, and the triangular section is located below the trumpet-shaped column section. Both the trumpet-shaped column section and the straight column section are located inside the trumpet-shaped pipe section, and the trumpet-shaped pipe section and the trumpet-shaped column section are matched and arranged to match each other. The triangular section is located inside the straight pipe section.

[0062] In this embodiment, the sealing section 11 is arranged from top to bottom as a straight column section, a trumpet-shaped column section, and a triangular section. These three sections are matched segment by segment with the trumpet-shaped pipe section and the straight pipe section of the pressure relief hole 7: the straight column section first enters the trumpet opening to achieve initial guidance and sealing; the trumpet-shaped column section then adheres to the trumpet pipe section to form a large-area elastic compression, blocking the liquid flow; the lowest triangular section extends into the straight pipe section, utilizing the wedge-shaped self-locking effect to enhance the low-pressure seal, while its tip can pierce and discharge impurities. When opened, the three sections disengage sequentially, and the flow area expands in a stepped manner, ensuring zero leakage when closed, low resistance and fast response at the moment of opening, and possessing a self-cleaning function. Thus, a balance between high sealing performance and low flow resistance is achieved in the same simple axial movement.

[0063] In one implementation, such as Figure 3 and Figure 4 As shown, the intelligent hydraulic valve for the hydraulic system also includes a screw 61, which is threadedly connected to a first screw hole, a second screw hole, and a third screw hole, respectively. The first screw hole is located on the cover 6, the second screw hole is located on the support tube 4, and the third screw hole is located on the elastic pad 103. The screw 61 is used for the fixed connection between the support tube 4 and the cover 6, and for clamping the elastic pad 103 between the support tube 4 and the cover 6.

[0064] In this embodiment, the same screw 61 is used to pass through the corresponding screw holes on the cover 6, the support tube 4 and the elastic pad 103 at the same time to achieve "one screw and three holes" integrated fastening: it not only locks the support tube and the cover into a rigid whole, but also applies a controllable amount of compression to the elastic pad during the tightening process to form an end face seal, without the need for additional clamps or sealing rings, reducing the number of parts, shortening the assembly chain and ensuring long-term sealing reliability.

[0065] While embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations fall within the scope and spirit of the present invention. Furthermore, the present invention described herein may have other embodiments and can be implemented or carried out in various ways.

Claims

1. An intelligent hydraulic valve for a hydraulic system, characterized in that, include: Hydraulic valve body (1); The inlet pipe (3) is connected at one end to the bottom of the hydraulic valve body (1) and at the other end to the liquid tank (2); A support tube (4) is provided at the top of the hydraulic valve body (1) and communicates with the inner cavity of the hydraulic valve body (1); The liquid outlet pipe (5) is connected at one end to the support pipe (4) and at the other end to the liquid tank (2); A cover (6) is provided on the top of the support tube (4) for sealing the upper opening of the support tube (4); The sealing rod (8) is movably disposed within the cavity of the support tube (4); The elastic part (9) is connected at one end to the upper end of the sealing rod (8) and at the other end to the cover (6); The sealing part (10) is connected at one end to the cover (6) and at the other end to the inner wall of the support tube (4). The sealing part (10) covers the sealing rod (8) and the elastic part (9). When the liquid in the hydraulic valve body (1) is at a first preset pressure, the sealing rod (8) is in a first position, and the sealing part (10) closes the outlet pipe (5); when the liquid in the hydraulic valve body (1) is at a second preset pressure, the sealing rod (8) is in a second position, and the sealing part (10) moves upward to open the outlet pipe (5); the support pipe (4) includes a first cavity and a second cavity, the first cavity is located below the second cavity, the size of the first cavity is smaller than the second cavity, the sealing rod (8) is movably inserted into the first cavity and the second cavity, and there is a first gap between the sealing rod (8) and the first cavity, the size of the first gap is between 0.01mm and 0.05mm, and there is a second gap between the sealing rod (8) and the second cavity, the size of the second gap is between 2cm and 10cm; the elastic part (9) includes: An elastic rod (91) is provided at the upper end of the sealing rod (8); An elastic cylinder (92) is provided on the lower end face of the cover (6), and the elastic cylinder (92) is movably sleeved outside the elastic rod (91); A spring (93) is wound around the elastic rod (91), and the two ends of the spring (93) are respectively fixedly connected to the side wall of the elastic rod (91) and the outer side wall of the elastic cylinder (92); the sealing part (10) includes: A sealing plug (101) is fixedly sleeved outside the sealing rod (8). The sealing plug (101) is movably disposed in the second cavity and is slidably connected to the cavity wall of the second cavity. The elastic tube (102) is fixedly connected at its lower end to the upper end surface of the sealing plug (101). The elastic tube (102) covers the sealing rod (8) and is fixedly connected at its upper end to the lower end surface of the elastic pad (103). The elastic pad (103) is fixedly connected to the lower end surface of the cover (6). A portion of the elastic pad (103) is located between the support tube (4) and the cover (6). The support tube (4) has a first step and a second step. The first step is located at the top of the support tube (4) and is in contact with the elastic pad (103). The second step is located below the first step and inside the support tube (4). The lower end of the sealing plug (101) is in contact with the second step.

2. The intelligent hydraulic valve for a hydraulic system according to claim 1, characterized in that, It also includes a pressure relief hole (7), which is opened on the support pipe (4). One end of the pressure relief hole (7) is located on the second step, and the other end is located on the outer wall of the support pipe (4). The pressure relief hole (7) is used to connect the liquid outlet pipe (5) with the second cavity.

3. The intelligent hydraulic valve for a hydraulic system according to claim 2, characterized in that, The pressure relief hole (7) has an L-shaped structure, and the vertical section of the pressure relief hole (7) includes a trumpet-shaped pipe section and a straight pipe section, with the straight pipe section located below the trumpet-shaped pipe section.

4. The intelligent hydraulic valve for a hydraulic system according to claim 3, characterized in that, It also includes a sealing part (11), which is located on the lower end face of the sealing plug (101) and is movably located inside the pressure relief hole (7).

5. The intelligent hydraulic valve for a hydraulic system according to claim 4, characterized in that, The sealing part (11) includes a trumpet-shaped column section, a straight column section and a triangular section. The straight column section is located above the trumpet-shaped column section, and the triangular section is located below the trumpet-shaped column section. Both the trumpet-shaped column section and the straight column section are located inside the trumpet-shaped pipe section, and the trumpet-shaped pipe section and the trumpet-shaped column section are matched and arranged to match each other. The triangular section is located inside the straight pipe section.

6. The intelligent hydraulic valve for a hydraulic system according to claim 5, characterized in that, It also includes screws (61), which are threaded to the first screw hole, the second screw hole and the third screw hole respectively. The first screw hole is located on the cover (6), the second screw hole is located on the support tube (4), and the third screw hole is located on the elastic pad (103). The screws (61) are used to fix the support tube (4) and the cover (6) and to hold the elastic pad (103) between the support tube (4) and the cover (6).

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