A one-way valve

Abstract

The application provides a one-way valve, which comprises a valve body, a one-way valve core assembly and a locking valve core assembly; the valve body is provided with an oil inlet, an oil outlet, a first accommodating cavity and a second accommodating cavity; a deformation damping ring is arranged in the second accommodating cavity; when a main oil passage is opened, the deformation damping ring is located between a conical body and a conical port; the outer side of the deformation damping ring is a sealing piston surface, and the inner side is a multi-section corrugated structure; the deformation damping ring can be radially contracted under axial pressure; a ring-shaped control cavity is formed around the outer side of the deformation damping ring on the second accommodating cavity; the ring-shaped control cavity is connected with the oil inlet through a pilot oil passage; a micro relief valve is elastically connected in the second accommodating cavity and located between the deformation damping ring and the conical port; the ring-shaped control cavity is connected with the micro relief valve through a bypass oil passage; when the main oil passage is closed, the outlet of the micro relief valve abuts against the conical body; and the conical body, the deformation damping ring and the conical port form a self-adapting three-stage buffer.

Description

Technical Field

[0001] This invention relates to the field of high-pressure, high-flow hydraulic components, and particularly to a one-way valve. Background Technology

[0002] As a key fluid control component in hydraulic systems, check valves are widely used in the piping systems of various industrial equipment to ensure stable fluid transmission in a single direction.

[0003] In a conventional design, a check valve consists of a valve body and a movable valve core assembly. The valve body has an inlet and an outlet on each side. The valve core assembly moves under the influence of a pressure difference. When the inlet pressure is higher than the outlet pressure, the fluid force causes the valve core to open, thus connecting the oil circuit. Conversely, when the outlet pressure is dominant, the valve core returns to its original position and closes, blocking reverse flow.

[0004] Existing technologies, such as those described in patent document CN202411354807.5, employ a conical valve core with a fixed geometry and a conical valve seat to form a throttling buffer mechanism. However, this structure has significant limitations: its buffering effect relies entirely on preset rigid geometric parameters, lacking dynamic response capability. In actual operating conditions, when system pressure fluctuates, flow changes, or load changes abruptly, the fixed buffer design cannot adjust the throttling intensity in real time, easily leading to insufficient buffering, causing water hammer effect, mechanical impact, and damage to sealing components, or causing excessive throttling, resulting in additional energy loss and response lag, affecting the overall stability and reliability of the system. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems by providing a one-way valve.

[0006] The technical solution of the present invention is a one-way valve, comprising a valve body, a one-way valve core assembly, and a locking valve core assembly; The valve body is provided with an oil inlet, an oil outlet, a first accommodating cavity, and a second accommodating cavity. The first accommodating cavity communicates with the second accommodating cavity and the oil outlet. The oil inlet communicates with the second accommodating cavity. The connection between the first accommodating cavity and the second accommodating cavity is a conical opening. The valve core head of the locking valve core assembly is a flexible conical body. When the main oil circuit is closed, the valve core head blocks the conical opening. When the main oil circuit is open, the conical body and the conical opening are located on the oil flow path. The second accommodating cavity is provided with a deformation damping ring. When the main oil circuit is open, the deformation damping ring is located between the conical body and the conical opening. The outer side of the deformation damping ring is a sealing piston surface, and the inner side is a multi-segment corrugated structure. The deformation damping ring can contract radially under axial pressure. The second accommodating cavity is provided with an annular control cavity surrounding the outer side of the deformation damping ring. The annular control cavity is connected to the oil inlet through a pilot oil passage. A miniature overflow valve is elastically connected in the second accommodating cavity between the deformation damping ring and the conical opening. The annular control cavity is connected to the miniature overflow valve through a bypass oil passage. When the main oil circuit is closed, the outlet of the miniature overflow valve abuts against the conical body. The conical body, the deformation damping ring, and the conical opening form an adaptively adjustable three-stage buffer.

[0007] In one embodiment, the deformation damping ring is made of a hydraulically responsive polymer.

[0008] In one embodiment, a limiting retaining ring is provided in the second accommodating cavity, and the limiting retaining ring is located at both ends of the deformation damping ring to fix its axial position.

[0009] As one implementation, the pilot oil passage is provided with a micro throttling orifice.

[0010] In one embodiment, the locking valve core assembly includes a valve core body and a mating component, the mating component being sleeved on the valve core body and the mating component being threadedly connected to the valve core body.

[0011] In one embodiment, the valve body is provided with a third accommodating cavity, which is located on one side of the second accommodating cavity and on the side of the oil inlet away from the first accommodating cavity. The third accommodating cavity is provided with a retractable limiting member, and the retraction direction of the limiting member is perpendicular to the movement direction of the locking valve core. When the oil pressure at the oil inlet is higher than a set value, the limiting member extends into the second accommodating cavity.

[0012] In one embodiment, the limiting member has a guide slope at one end facing the second accommodating cavity, and the guide slope faces the side where the first accommodating cavity is located.

[0013] In one embodiment, the locking valve core assembly further includes an isolation plate located between the oil inlet and the mating part, and the isolation plate is sealed around the valve core rod of the locking valve core assembly.

[0014] In one embodiment, the inner cavity of the first accommodating cavity has a conical structure.

[0015] The advantages of this invention compared to the prior art are that the one-way valve uses a three-stage adaptive adjustment buffer formed by a cone-shaped body, a deformation damping ring, and a cone-shaped opening. Combining the radial contraction characteristics of the deformation damping ring with the function of a miniature relief valve, it dynamically responds to changes in oil pressure to adjust the throttling intensity in real time. It has an adaptive adjustment buffer function, which can dynamically adjust the throttling intensity according to the oil pressure inside the valve, effectively suppressing water hammer effect and mechanical shock, while avoiding energy loss and response lag caused by excessive throttling, thus improving the stability and reliability of the hydraulic system. Attached Figure Description

[0016] Figure 1 A perspective sectional view of a one-way valve provided for an embodiment of the present invention; Figure 2 A planar sectional view of a one-way valve provided for an embodiment of the present invention.

[0017] In the diagram: 1. Valve body; 2. One-way valve core assembly; 3. Locking valve core assembly; 4. Oil inlet; 5. Oil outlet; 6. First accommodating cavity; 7. Second accommodating cavity; 8. Conical opening; 9. Deformation damping ring; 10. Annular control cavity; 11. Pilot oil passage; 12. Miniature relief valve; 13. Bypass oil passage; 14. Limiting retaining ring; 15. Valve core body; 16. Mating component; 17. Third accommodating cavity; 18. Limiting component; 19. Isolation plate; 20. Valve core head. Detailed Implementation

[0018] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] In one implementation, such as Figures 1 to 2 As shown.

[0020] The one-way valve provided in this embodiment includes a valve body 1, a one-way valve core assembly 2, and a locking valve core assembly 3. The valve body 1 has an oil inlet 4, an oil outlet 5, a first accommodating cavity 6, and a second accommodating cavity 7. The first accommodating cavity 6 communicates with the second accommodating cavity 7, and the first accommodating cavity 6 communicates with the oil outlet 5. The oil inlet 4 communicates with the second accommodating cavity 7. The connection between the first accommodating cavity 6 and the second accommodating cavity 7 is a conical opening 8. The valve core head 20 of the locking valve core assembly 3 is a flexible conical body. When the main oil circuit is closed, the valve core head 20 blocks the conical opening 8. When the main oil circuit is open, the conical body and the conical opening 8 are located on the oil flow path. The second accommodating cavity 7 is provided with a deformation damping ring 9. When the main oil circuit is open, the deformation damping ring 9 is located... Between the valve core head 20 and the conical port 8, the outer side of the deformation damping ring 9 is a sealing piston surface, and the inner side is a multi-segment corrugated structure. The deformation damping ring 9 can contract radially under axial pressure. The second accommodating cavity 7 is provided with an annular control cavity 10 surrounding the outer side of the deformation damping ring 9. The annular control cavity 10 is connected to the oil inlet 4 through the pilot oil passage 11. The second accommodating cavity 7 is elastically connected to a miniature relief valve 12 located between the deformation damping ring 9 and the conical port 8. The annular control cavity 10 is connected to the miniature relief valve 12 through the bypass oil passage 13. When the main oil circuit is closed, the outlet of the miniature relief valve 12 abuts against the valve core head 20. The valve core head 20, the deformation damping ring 9, and the conical port 8 form an adaptive three-stage buffer.

[0021] In this embodiment, the valve core head 20 is a flexible sealing component, which functions to achieve dynamic sealing or throttling under different pressure conditions. The valve core head 20 can be made of rubber, silicone, or other polymer materials with certain elasticity and oil resistance. Its shape design can be adjusted to a conical, elliptical conical, or multi-stage conical structure according to actual needs to meet different sealing and throttling requirements. The flexibility of the valve core head 20 can be achieved by changing the material hardness or wall thickness, for example, by setting cavities or reinforcing ribs inside the valve core head 20 to optimize its deformation capacity. The deformation damping ring 9, as a dynamic adjustment element, mainly functions to change the flow area through its own deformation, thereby adjusting the fluid resistance. The multi-segment corrugated structure of the deformation damping ring 9 can achieve different deformation characteristics by changing the number, depth, or spacing of the corrugations. For example, the corrugated structure can be designed with equal spacing, gradually varying spacing, or staggered arrangement to adapt to different pressure variation ranges. The miniature relief valve 12, as an auxiliary adjustment element, mainly provides a pressure relief channel when the pressure inside the valve is too high. The elastic connection structure of the miniature overflow valve 12 can be achieved by using metal bellows, rubber diaphragms or spring plates to ensure that it can maintain stable connection performance under different working conditions.

[0022] In this embodiment, the valve body 1, the one-way valve core assembly 2, and the locking valve core assembly 3 together constitute the basic fluid control structure. The inlet 4, outlet 5, first accommodating cavity 6, and second accommodating cavity 7 on the valve body 1 define the fluid path. The first accommodating cavity 6 communicates with the outlet 5, and the inlet 4 communicates with the second accommodating cavity 7. The first accommodating cavity 6 and the second accommodating cavity 7 are connected by a conical opening 8, which serves as a fixed throttling point to provide initial buffering. The valve core head 20 of the locking valve core assembly 3 is a flexible conical body. When the main oil circuit is closed, it seals the conical opening 8 to achieve a sealing function. When the main oil circuit is open, the valve core head 20 is located on the flow path and participates in throttling. Its flexible design allows it to deform under pressure changes, thereby adapting to different operating conditions. The principle of the one-way valve's closing and opening is as follows: Under the action of its spring, the valve core head 20 of the locking valve core assembly 3 seals the connection between the first accommodating cavity 6 and the second accommodating cavity 7. The one-way valve core of the one-way valve core assembly 2, under the action of its spring, blocks the conical opening 8 of the first accommodating cavity 6. The limiting member 18, under the action of its spring, is completely located in the third accommodating cavity 17. At this time, the oil circuit is completely cut off, and the one-way valve is in the closed state. When oil enters through the oil inlet 4, the oil enters the third accommodating cavity 17 through the oil passage. The oil pressure pushes the limiting member 18 to compress its spring, causing the limiting member 18 to partially extend into the second accommodating cavity 7. The operator turns the handwheel clockwise, causing the valve core rod to rotate. Since the valve core head 20 is pressed tightly at the end of the second accommodating cavity 7 and cannot move, the mating part moves to the right along the thread, compressing the spring. During the rightward movement of the mating part 16, its right side contacts the guide slope of the limiting member 18, pushing the limiting member 18 to temporarily retract. Continuing to rotate, after the mating part 16 completely passes the limiting member 18, the limiting member 18, under the action of its spring, extends back into the second accommodating cavity 7. At this time, the mating part 16 is stuck by the limiting member 18 and cannot move to the left. Next, turn the handwheel counterclockwise. Due to the limiting position of the mating part 16, the valve core rod drives the valve core head 20 to move to the right. The second accommodating chamber 7 is opened, and the oil flows from the oil inlet 4 through the conical surface of the valve core head 20 and enters the first accommodating chamber 6. The oil pushes the one-way valve core assembly 2 to the left, compressing its spring and opening the conical port 8, allowing the oil to flow to the oil outlet 5. At this time, the one-way valve is fully open, and the oil passage is unobstructed.

[0023] When the oil passage is unobstructed, the oil also enters the annular control chamber 10 through the pilot oil passage 11, controlling the radial contraction of the deformation damping ring 9 according to the real-time oil pressure. As the corrugated structure of the deformation damping ring 9 gradually compresses and the inner diameter decreases, the flow area decreases. This causes a throttling effect when the oil passes through, softening the pressure rise slope within the valve. Since the deformation damping ring 9 is located between the valve core head 20 and the conical port 8, it forms an adaptive three-stage buffer together with the valve core head 20 and the conical port 8. Specifically, the conical surface and flexibility of the valve core head 20 allow it to adapt to pressure fluctuations, the deformation damping ring 9 dynamically adjusts the damping strength through radial contraction, and the conical port 8 provides the basic throttling function. Furthermore, it can dynamically adjust the buffering characteristics according to actual operating conditions, avoiding problems of insufficient buffering or excessive throttling. This is reflected in the fact that the higher the oil pressure at the inlet 4, the more pronounced the throttling effect of the deformation damping ring 9. The lower the oil pressure at the inlet 4, the better the flowability of the deformation damping ring 9. If the oil pressure continues to rise when the deformation damping ring 9 contracts to its designed minimum inner diameter, then the miniature relief valve 12 opens, providing an additional passage. It should be noted that the miniature relief valve 12 can only be opened when the oil passage is unobstructed. When the oil passage is completely cut off, the valve core head 20, under the action of its spring, blocks the connection between the first receiving cavity 6 and the second receiving cavity 7. The flexible valve core head 20 undergoes a certain circumferential expansion due to close contact, causing it to abut against the outlet of the miniature relief valve 12. Furthermore, the elastic connection structure of the miniature relief valve 12 ensures that the two are in close contact, forming a seal.

[0024] Therefore, this one-way valve, through the adaptive adjustment of the three-stage buffer formed by the valve core head 20, the deformation damping ring 9, and the conical port 8, combined with the radial contraction characteristics of the deformation damping ring 9 and the function of the miniature relief valve 12, dynamically responds to changes in oil pressure to adjust the throttling intensity in real time. It has an adaptive adjustment buffer function, which can dynamically adjust the throttling intensity according to the oil pressure inside the valve, effectively suppressing water hammer effect and mechanical shock, while avoiding energy loss and response lag caused by excessive throttling, and improving the stability and reliability of the hydraulic system.

[0025] In one embodiment, the deformation damping ring 9 of the check valve is made of a hydraulically responsive polymer.

[0026] In this embodiment, the deformation damping ring 9 is an elastic element capable of adjusting its molecular structure or elastic modulus in real time according to changes in oil pressure. It can be implemented using a smart polymer material with pressure-sensitive properties. This hydraulically responsive polymer exhibits softening properties under high pressure to increase radial contraction, while hardening under low pressure to reduce contraction, thus achieving dynamic adjustment. By selecting a hydraulically responsive polymer as the constituent material of the deformation damping ring 9, the ring can produce precise radial contraction behavior under axial pressure. When the main oil circuit is opened, the pressure at the inlet 4 is transmitted to the annular control chamber 10 through the pilot oil passage 11, and the hydraulically responsive polymer automatically adjusts its deformation degree according to the actual oil pressure. Under high pressure conditions, material softening causes the deformation damping ring 9 to produce greater radial contraction, thereby expanding the oil flow area and effectively preventing impact phenomena caused by insufficient buffering. Under low pressure conditions, material hardening allows the deformation damping ring 9 to maintain a smaller radial contraction, maintaining an appropriate throttling effect and avoiding excessive throttling that reduces system efficiency. This dynamic adjustment characteristic ensures that the check valve can maintain a stable three-stage buffering effect under different operating conditions.

[0027] In one embodiment, the second accommodating cavity 7 of the one-way valve is provided with a limiting retaining ring 14, which is located at both ends of the deformation damping ring 9 to fix its axial position.

[0028] In this embodiment, the limiting retaining ring 14 is a positioning structure used to restrict the axial movement of the deformation damping ring 9. The limiting retaining ring 14 forms a tight fit with the inner wall of the second accommodating cavity 7 to ensure its stability in a high-pressure oil environment. The two ends of the deformation damping ring 9 refer to its two end faces along the axial direction. This double-end fixing method effectively eliminates the instability of single-point fixing, thereby preventing the deformation damping ring 9 from tilting or slipping under dynamic operating conditions.

[0029] In one embodiment, the pilot oil passage 11 of the one-way valve is provided with a micro throttling orifice.

[0030] In this embodiment, the purpose of the micro-throttling orifice is to control the flow velocity of the oil in the pilot oil passage 11 by limiting the cross-sectional area of ​​the oil flow, thereby preventing sudden pressure changes from directly affecting the deformation damping ring 9. The micro-throttling orifice, located in the pilot oil passage 11, effectively slows down the rate of pressure increase or decrease within the annular control cavity 10. This process allows the multi-segment corrugated structure of the deformation damping ring 9 to radially contract or expand at a smoother rhythm under axial pressure.

[0031] In one implementation, such as Figure 2 As shown.

[0032] The locking valve core assembly 3 of the one-way valve provided in this embodiment includes a valve core body 15 and a mating part 16. The mating part 16 is sleeved outside the valve core body 15 and the mating part 16 and the valve core body 15 are threaded together.

[0033] In this embodiment, the valve core body 15 refers to the core component in the one-way valve used to realize the opening and closing of the oil circuit, and it is made of metal or high-strength composite material. The mating part 16 mates with the valve core body 15 and is a sleeve with an internal thread structure. Precision machining ensures a tight fit with the external thread of the valve core body 15. The threaded connection provides an adjustable connection method, allowing the valve core assembly to be adjusted in position according to actual operating conditions.

[0034] In one implementation, such as Figure 2 As shown.

[0035] The valve body 1 of the one-way valve provided in this embodiment is provided with a third accommodating cavity 17. The third accommodating cavity 17 is located on one side of the second accommodating cavity 7 and on the side of the oil inlet 4 away from the first accommodating cavity 6. The third accommodating cavity 17 is provided with a retractable limiting member 18, and the extension and retraction direction of the limiting member 18 is perpendicular to the movement direction of the locking valve core assembly 3. When the oil pressure at the oil inlet 4 is higher than the set value, the limiting member 18 extends into the second accommodating cavity 7.

[0036] In this embodiment, the third accommodating cavity 17 is used to accommodate and guide the movement of the limiting member 18. Its purpose is to provide a precise movement path for the limiting member 18 while ensuring that the cavity is directly exposed to the high-pressure oil path of the oil inlet 4, thereby achieving an immediate response to oil pressure changes. The limiting member 18 can extend and retract under specific conditions. Its purpose is to suppress the axial displacement of the locking valve core through physical obstruction, while avoiding interference with the valve core's movement trajectory. The extension and retraction direction of the limiting member 18 is perpendicular to the movement direction of the locking valve core. This orthogonal arrangement forms a physical obstruction when the limiting member 18 extends into the second accommodating cavity 7, precisely suppressing the axial displacement of the locking valve core while avoiding interference with the valve core's movement trajectory. When the oil pressure at the oil inlet 4 exceeds a set threshold, the limiting member 18 automatically extends into the second accommodating cavity 7 according to the oil pressure change, using oil pressure as a driving source to achieve passive control.

[0037] In one embodiment, the limiting member 18 of the one-way valve is provided with a guide slope at one end facing the second accommodating cavity 7, and the guide slope faces the side where the first accommodating cavity 6 is located.

[0038] In this embodiment, the guide ramp can be implemented using a straight ramp, an arc-shaped transition ramp, or a multi-segment broken-line ramp. The purpose is to disperse the force through the tilt angle, transforming rigid impact into smooth sliding guidance, thereby reducing local stress concentration. The side where the first accommodating cavity 6 is located refers to the direction corresponding to the position of the first accommodating cavity 6, which can be ensured to be consistent with the valve core's movement direction by setting the ramp orientation during processing. When the oil pressure at the oil inlet 4 is higher than the set value, the limiting member 18 extends into the second accommodating cavity 7, at which point the guide ramp can form a progressive contact with the movement path of the locking valve core assembly 3. During the movement of the valve core towards the oil outlet 5, the ramp can actively guide it to be limited.

[0039] In one implementation, such as Figure 2 As shown.

[0040] The locking valve core assembly 3 of the one-way valve provided in this embodiment also includes an isolation plate 19, which is located between the oil inlet 4 and the mating part 16, and the isolation plate 19 is sealed outside the valve core body 15.

[0041] In this embodiment, the isolation plate 19 is used to prevent fluid from entering a specific area, and can be implemented using a metal plate, a polymer composite material plate, or a flexible sealing gasket. The position design of the isolation plate 19 must ensure that it can effectively block high-pressure oil from directly impacting the threaded connection interface, thereby avoiding loosening or failure caused by oil erosion. By adding the isolation plate 19, the problem of high-pressure oil intruding into the mating part 16 area is specifically solved. The isolation plate 19 is located between the oil inlet 4 and the mating part 16. This position design ensures that the high-pressure oil flowing in from the oil inlet 4 is physically blocked before reaching the mating part 16, preventing the oil from directly impacting or seeping into the threaded connection interface between the valve core body 15 and the mating part 16.

[0042] In one embodiment, the inner cavity of the first receiving chamber 6 of the one-way valve has a conical structure.

[0043] In this embodiment, the first accommodating cavity 6 refers to the cavity structure within the valve body 1 used to contain oil and guide its flow to the conical orifice 8. It can be implemented using a tapered conical design, the purpose of which is to optimize the continuity of the oil flow path through geometric matching. The conical structure design can dynamically adjust the oil velocity distribution according to fluid dynamics principles, thereby reducing energy dissipation and turbulence caused by abrupt changes in cross-section. The conical inner cavity structure dynamically guides the fluid path according to changes in oil pressure, ensuring a more stable oil film distribution in the contact area between the valve core head 20 and the conical orifice 8, thus enhancing the radial contraction response capability of the deformation damping ring 9 under axial pressure.

[0044] The above detailed embodiments further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A one-way valve, characterized in that, Includes valve body, one-way valve core assembly, and locking valve core assembly; The valve body is provided with an oil inlet, an oil outlet, a first accommodating cavity, and a second accommodating cavity. The first accommodating cavity communicates with the second accommodating cavity and the oil outlet. The oil inlet communicates with the second accommodating cavity. The connection between the first accommodating cavity and the second accommodating cavity is a conical opening. The valve core head of the locking valve core assembly is a flexible conical body. When the main oil circuit is closed, the valve core head blocks the conical opening. When the main oil circuit is open, the conical body and the conical opening are located on the oil flow path. The second accommodating cavity is provided with a deformation damping ring. When the main oil circuit is open, the deformation damping ring is located between the conical body and the conical opening. The outer side of the deformation damping ring is a sealing piston surface, and the inner side is a multi-segment corrugated structure. The deformation damping ring can contract radially under axial pressure. The second accommodating cavity is provided with an annular control cavity surrounding the outer side of the deformation damping ring. The annular control cavity is connected to the oil inlet through a pilot oil passage. A miniature overflow valve is elastically connected in the second accommodating cavity between the deformation damping ring and the conical opening. The annular control cavity is connected to the miniature overflow valve through a bypass oil passage. When the main oil circuit is closed, the outlet of the miniature overflow valve abuts against the conical body. The conical body, the deformation damping ring, and the conical opening form an adaptively adjustable three-stage buffer.

2. The one-way valve according to claim 1, characterized in that, The deformation damping ring is made of a hydraulically responsive polymer.

3. The one-way valve according to claim 1, characterized in that, The second accommodating cavity is provided with a limiting retaining ring, which is located at both ends of the deformation damping ring to fix its axial position.

4. The one-way valve according to claim 1, characterized in that, The pilot oil passage is equipped with a micro throttling orifice.

5. The one-way valve according to claim 1, characterized in that, The locking valve core assembly includes a valve core body and a mating component. The mating component is sleeved on the valve core body and the mating component is threadedly connected to the valve core body.

6. The one-way valve according to claim 5, characterized in that, The valve body is provided with a third accommodating cavity, which is located on one side of the second accommodating cavity and on the side of the oil inlet away from the first accommodating cavity. The third accommodating cavity is provided with a retractable limiting member, and the retraction direction of the limiting member is perpendicular to the movement direction of the locking valve core assembly. When the oil pressure at the oil inlet is higher than a set value, the limiting member extends into the second accommodating cavity.

7. The one-way valve according to claim 6, characterized in that, The limiting member has a guide slope at one end facing the second accommodating cavity, and the guide slope faces the side where the first accommodating cavity is located.

8. The one-way valve according to claim 5, characterized in that, The locking valve core assembly also includes an isolation plate, which is located between the oil inlet and the mating part, and the isolation plate is sealed around the valve core body.

9. The one-way valve according to claim 1, characterized in that, The inner cavity of the first accommodating cavity has a conical structure.

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