Valve element structure, flow valve and hydraulic system

Abstract

The valve element structure comprises a valve element body (1), an orifice plug (2) and a check ring (3), an oil port A, an oil port B and a valve element oil cavity (4) are formed in the valve element body (1), the valve element oil cavity (4) is communicated with the oil port A and the oil port B, and a supporting flange (5) is formed on the inner wall face of the valve element body (1). A check ring installation groove (7) used for installing the check ring (3) is formed in the inner wall face of the valve element body (1), one end of the orifice plug (2) abuts against the supporting flange (5), the other end of the orifice plug (2) abuts against the check ring (3), and a throttling hole (6) used for communicating the oil port A with the oil port B is formed in one end of the orifice plug (2). In addition, the utility model further relates to a flow valve comprising the valve core structure and a hydraulic system. The valve element structure is convenient and fast to machine and install, and the orifice plug is firmly installed and is not prone to falling off.

Description

Technical Field

[0001] The utility model relates to a hydraulic valve core, in particular to a valve core structure, and further to a flow valve and a hydraulic system. Background Art

[0002] The flow control valve is a common hydraulic valve that adjusts the output flow by controlling the relative movement of the valve core and the valve body to change the valve port area. Among them, the throttle hole is a very common design in the flow valve. The main function of the throttle hole is to change the pressure difference before and after, produce throttling, pressure regulation and buffering effects, thereby controlling the flow, pressure and other characteristic quantities of the fluid in the flow valve.

[0003] When machining the throttle hole, the drill needs to be inserted into the middle of the valve core, which is difficult to position. In addition, due to the small diameter of the throttle hole, the drill is slender and easy to break. Therefore, the prior art sets a throttle plug, on which a throttle hole is formed. The throttle plug is installed in the valve core through threads, so that the throttle plug can be processed independently of the valve core. However, since the throttle plug and the valve core are designed as a split body, and the throttle plug and the valve core are connected through threads, during the use of the flow valve, the throttle plug is easily damaged under the long-term influence of the pressure shock and vibration of the oil, causing the throttle plug to fall off, thereby causing the flow valve to malfunction.

[0004] In view of this, it is necessary to design a valve core structure that can effectively solve the above technical problems. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a valve core structure, which is convenient to process and install, and the throttle plug is firmly installed and not easy to fall off.

[0006] Furthermore, the technical problem to be solved by the utility model is to provide a flow valve, the valve core structure of which is convenient to process, and the throttle plug is firmly installed and not easy to fall off.

[0007] Furthermore, the technical problem to be solved by the utility model is to provide a hydraulic system, in which the throttle plug of the overflow valve of the hydraulic system is not easy to fall off.

[0008] In order to solve the above technical problems, the utility model provides a valve core structure, which includes a valve core body, a throttle plug and a retaining ring. The valve core body forms oil port A, oil port B and a valve core oil chamber, the valve core oil chamber connects oil port A and oil port B, the inner wall surface of the valve core body forms a supporting flange, the inner wall surface of the valve core body is formed with a retaining ring mounting groove for installing the retaining ring, one end of the throttle plug abuts on the supporting flange, the other end of the throttle plug abuts on the retaining ring, and one end of the throttle plug forms a throttling hole for connecting oil port A and oil port B.

[0009] Preferably, the retaining ring is a wire retaining ring.

[0010] Preferably, the retaining ring mounting groove is arranged close to the oil port A or the oil port B.

[0011] On the basis of the technical solutions of the above valve core structure, the utility model further provides a flow valve, which includes the valve core structure of any of the above technical solutions.

[0012] Specifically, the flow valve also includes a valve body, a spring and a spring seat. The valve body is formed with an oil port C, an oil port D, a first oil chamber and a second oil chamber. The oil port C is connected to the oil port D through the first oil chamber and the second oil chamber in sequence. The valve core structure is arranged in the second oil chamber. The spring seat forms a flange step surface. The valve core structure forms a supporting step surface. The spring is arranged between the flange step surface and the supporting step surface to provide the valve core structure with a force to drive it to block the passage between the first oil chamber and the second oil chamber.

[0013] Preferably, the supporting flange divides the valve core oil chamber into a throttle plug installation chamber and a guide chamber, the throttle plug installation chamber is used to install the throttle plug, the spring seat forms a guide portion, the guide portion is slidably arranged in the guide chamber, the spring sleeve is arranged at one end of the valve core body close to the guide chamber, the guide portion is slidably arranged in the guide chamber, the guide portion and the throttle plug are spaced apart so that the valve core structure and the guide portion cooperate to form a valve core inner chamber.

[0014] Preferably, a plug is further included, a plug installation opening is formed at one end of the valve body away from the oil port C, the plug is sealably installed at the plug installation opening, and a spring seat is arranged at one end of the plug close to the second oil chamber.

[0015] Preferably, a plug sealing ring is also included, and a sealing ring installation groove for installing the plug sealing ring is formed between the plug and the valve body.

[0016] Preferably, a normally open throttle hole is formed at a position of the valve body corresponding to the first oil chamber.

[0017] On the basis of the above-mentioned technical solutions of the valve core structure and the flow valve, the utility model further provides a hydraulic system, which includes the valve core structure or the flow valve of any of the above-mentioned technical solutions.

[0018] Through the above technical scheme, the utility model provides a valve core structure, the valve core body and the throttle plug of the valve core structure can be processed independently, so that the throttle hole on the throttle plug can be processed independently of the valve core body, the throttle hole is convenient to process, and the drill bit is not easy to break during processing. The prior art uses a threaded connection between the throttle plug and the valve core body. Under the action of pressure shock and vibration, the threaded structure is easily damaged, causing the throttle plug to fall off. The present application limits the two ends of the throttle plug by a retaining ring and a supporting flange to achieve the connection between the throttle plug and the valve core. The structure is compact and the connection is firm and will not fall off, thereby improving the reliability and service life of the valve core structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a valve core structure of a specific implementation mode of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a flow valve according to a specific implementation mode of the utility model.

[0021] Description of Reference Numerals

[0022] 1 Valve core body 2 Throttle plug

[0023] 3 retaining ring 4 valve core oil chamber

[0024] 5Support flange 6Throttle hole

[0025] 7 retaining ring installation groove 8 valve body

[0026] 9 spring 10 spring seat

[0027] 11 first oil chamber 12 second oil chamber

[0028] 13 flange step surface 14 support step surface

[0029] 15 throttle plug installation cavity 16 guide cavity

[0030] 17 guide part 18 plug sealing ring

[0031] 19 plug 20 plug installation port

[0032] 21 Sealing ring 22 Sealing ring installation groove

[0033] 23 Normal throttle hole 24 Wrench hole

[0034] 25 oil chamber communication port 26 blocking slope

[0035] 27 Valve core cavity DETAILED DESCRIPTION

[0036] The following is a further detailed description of the implementation of the utility model in conjunction with the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the utility model, but cannot be used to limit the scope of the utility model. The utility model can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0037] The utility model provides these embodiments to make the utility model thorough and complete, and fully express the scope of the utility model to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps described in these embodiments should be interpreted as merely exemplary, rather than as a limitation.

[0038] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "inside" and "outside" and the like indicate positions or positional relationships only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0040] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0041] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0043] like Figure 1 and Figure 2As shown, the valve core structure of the utility model includes a valve core body 1, a throttle plug 2 and a retaining ring 3. The valve core body 1 forms an oil port A, an oil port B and a valve core oil chamber 4. The valve core oil chamber 4 communicates with the oil port A and the oil port B. The inner wall surface of the valve core body 1 forms a supporting flange 5. The supporting flange 5 divides the valve core oil chamber 4 into a throttle plug installation chamber 15 and a guide chamber 16. The inner wall surface of the valve core body 1 corresponding to the throttle plug installation chamber 15 forms a retaining ring installation groove 7. The throttle plug 7 is installed between the supporting flange 5 and the retaining ring installation groove 7. The retaining ring 3 is installed in the retaining ring installation groove 7 so that both ends of the throttle plug 7 are respectively supported by the supporting flange 5. The throttle plug 2 is stopped by the retaining ring 3, and a throttle hole 6 is formed in the middle position of the end face of the throttle plug 2. The throttle hole 6 can connect the oil port A and the oil port B. The valve core structure adopts a split valve core body 1 and a throttle plug 2, so that the throttle plug 2 can be processed independently of the valve core body 1, so that when processing the throttle hole 6, it is not necessary to extend the drill into the valve core oil chamber 4 for processing, but directly position and process it on the end face of the throttle plug 2, positioning and processing are more convenient, and the drill size is shortened, reducing the risk of drill breakage. In addition, the support flange 5 and the retaining ring installation groove 7 of the utility model are easier to process than the threaded structure. When the valve core body 1 is small in size, it is inconvenient to rotate the throttle plug 2 and install it in the valve core body 1 through the threaded structure. The installation process of the retaining ring 3 of the utility model is as follows: first press the retaining ring 3, then put the compressed retaining ring 3 into the valve core oil chamber 4, and finally push the retaining ring 3 to the retaining ring installation groove 7. After the retaining ring is moved to the retaining ring installation groove 7, it recovers elastically. The elastically recovered retaining ring 3 can be close to the retaining ring installation groove 7 and abut the throttle plug 2, which is convenient for installation. Compared with the threaded structure, the structural strength of the support flange 5 and the retaining ring 3 of the present application is higher, and it is not easy to deform and damage under the impact and vibration of the oil, ensuring that the throttle plug and the valve core body 1 are firmly connected, avoiding the throttle plug from falling off, and improving the reliability and stability of the valve core structure.

[0044] In some preferred embodiments, the retaining ring 3 is a steel wire retaining ring, which has a high structural strength and is not easily deformed or damaged under the impact and vibration of oil pressure, thereby improving the reliability and stability of the valve core structure.

[0045] In some preferred embodiments, the retaining ring mounting groove 7 is arranged close to the oil port A or the oil port B, such as Figure 1 As shown, the retaining ring mounting groove 7 of this embodiment is set to be close to the oil port A, and the supporting flange 5 is processed and formed at the corresponding position on the inner wall surface of the valve core body 1 according to the axial size of the throttle plug 2, so that the supporting flange 5 and the retaining ring mounting groove 7 are closer to the oil port A, which is convenient for the processing of the supporting flange 5 and the retaining ring mounting groove 7, and also convenient for the installation of the throttle plug 2 and the retaining ring 3.

[0046] On the basis of the valve core structure provided by the above technical solution of the utility model, the utility model also provides a flow valve, which includes the above valve core structure of the present application, so that the valve core structure of the flow valve is easy to process, and the throttle plug is firmly installed and not easy to fall off.

[0047] In some specific embodiments, Figure 2 As shown, the flow valve of this embodiment also includes a valve body 8, a spring 9 and a spring seat 10. The valve body 8 is formed with an oil port C, an oil port D, a first oil chamber 11 and a second oil chamber 12. The oil port C can be connected to the oil port D through the first oil chamber 11 and the second oil chamber 12 in sequence. The spring seat 10 and the valve core structure are arranged in the second oil chamber 12 along the axial direction of the valve body 8. The spring seat 10 forms a flange step surface 13, and the valve core structure forms a supporting step surface 14. The spring 9 is arranged between the flange step surface 13 and the supporting step surface 14. An oil chamber connecting port 25 is formed at the connection between the first oil chamber 11 and the second oil chamber 12. A blocking slope 26 is formed at the position of the valve core body 1 close to the oil chamber connecting port 25. The spring 9 provides a force to the valve core structure to drive the valve core structure to move toward the first oil chamber 11, so that the blocking slope 26 abuts against the oil chamber connecting port 25, so that the valve core structure blocks the passage between the first oil chamber 11 and the second oil chamber 12.

[0048] In some specific embodiments, Figure 2 As shown, the valve core structure of this embodiment is a one-way valve core. When the oil port C enters high-pressure oil, the valve core structure can be pushed to move, opening the passage between the oil port C and the oil port D. When the oil port D enters high-pressure oil, the valve core structure is tightly attached to the oil chamber communication port 25 under the action of the hydraulic oil in the second oil chamber 12 and the spring 9, so that the hydraulic oil in the second oil chamber 12 cannot enter the first oil chamber 11, and the oil port C and the oil port D are not connected. In other specific embodiments, the valve core structure can also be bidirectionally conductive.

[0049] In some preferred embodiments, Figure 2As shown, the supporting flange 5 of the valve core structure divides the valve core oil chamber 4 into a throttle plug installation chamber 15 and a guide chamber 16. The throttle plug installation chamber 15 is used to install the throttle plug 2. The spring seat 10 forms a guide portion 17. The spring 9 is sleeved on one end of the valve core body 1 close to the guide chamber 16. The guide portion 17 is slidably arranged in the guide chamber 16, and the guide portion 17 and the throttle plug 2 are arranged at intervals, so that the inner wall surface of the guide chamber 16 of the valve core structure and the guide portion 17 cooperate to form a valve core inner chamber 27. The valve core body 1 is hollow to form the guide chamber 16, and the guide portion 17 of the spring seat 10 extends into the guide chamber 16. The structure is simple and compact, and the space occupation is reduced. The guide portion 17 and the guide chamber 16 cooperate with each other to guide the sliding of the valve core structure, avoid the deviation of the valve core structure, and ensure the stability of the valve core structure. When high-pressure oil enters the oil port C, the hydraulic oil flows into the valve core cavity 27 from the throttle hole 6. The oil in the valve core cavity 27 can provide the throttle plug 2 with a force toward the oil cavity connecting port 25, delaying the opening time of the valve core structure.

[0050] In some preferred embodiments, the flow valve also includes a plug 19, and a plug installation port 20 is formed at one end of the valve body 8 away from the oil port C. The plug 19 is sealingly installed at the plug installation port 20, and the spring seat 10 is installed at one end of the plug close to the second oil chamber 12, thereby facilitating the installation of the valve seat and the valve core structure.

[0051] In some preferred embodiments, the flow valve of this embodiment also includes a plug sealing ring 18, and a sealing ring installation groove 22 for installing the plug sealing ring is formed between the plug 19 and the valve body 8, thereby realizing the sealing between the valve body 8 and the plug 19. In some embodiments, the valve body 8 and the plug 19 are threadedly connected, and a wrench hole 24 is formed at the end of the plug 19 away from the spring seat 10. By tightening or loosening the wrench hole with a wrench, the plug drives the spring seat to approach or move away from the valve core structure, thereby changing the compression amount of the spring 9, changing the pressure of the spring 9 on the valve core structure, and then changing the opening pressure of the valve core structure.

[0052] A normally-open throttle hole 23 is formed on the side wall of the valve body 8 at a position corresponding to the first oil chamber 11. The normally-open throttle hole 23 is used to connect the first oil chamber 11 and the external oil circuit. When high-pressure oil enters the oil port C, the hydraulic oil in the oil port C can be depressurized from the normally-open throttle hole 23 to the external oil circuit, thereby delaying the opening time of the valve core structure.

[0053] The utility model provides a preferred flow valve, such as Figure 1 to Figure 2As shown, the flow valve includes a valve core structure, a valve body 8, a spring 9 and a spring seat 10. The valve core structure includes a valve core body 1, a throttle plug 2 and a wire retaining ring (retaining ring 3). The valve core body 1 forms an oil port A, an oil port B and a valve core oil chamber 4. The inner wall surface of the valve core body 1 also forms a supporting flange 5 to separate the valve core oil chamber 4 into a throttle plug installation chamber 15 close to the oil port A and a guide chamber 16 close to the oil port B. A throttle hole 6 is formed at the center of the end face of one end of the throttle plug 2. Since the valve core body 1 and the throttle plug 2 are processed independently of each other, there is no need to insert the drill bit into the valve core oil chamber 4 when processing the throttle hole 6. Instead, the end face of the throttle plug 2 is directly processed, which is convenient for positioning the throttle hole 6 and reduces the risk of drill bit breakage during processing. A retaining ring mounting groove 7 is formed on the inner wall surface of the main body 1 corresponding to the throttle plug mounting cavity 15, and the processed throttle plug 2 is installed in the throttle plug mounting cavity 15, one end of the throttle plug 2 is against the supporting flange 5, and then the wire retaining ring is installed in the retaining ring mounting groove 7, so that the other end of the throttle plug 2 is against the wire retaining ring, and the inner wall surface of the valve core main body 1 cooperates with the wire retaining ring and the supporting flange 5 to fix the throttle plug 2. Compared with the threaded structure, this structure is easy to process, simple to install, has high structural strength and firm connection. Under the influence of long-term impact and vibration of hydraulic oil, the supporting flange 5 and the wire retaining ring are not easily damaged, thereby preventing the throttle plug 2 from falling off and improving the reliability of the flow valve. The valve body 8 includes a valve body 8 and a plug 19. The valve body 8 is formed with an oil port C and an oil port D. The valve core structure is installed in the valve body 8. The end of the valve core body 1 close to the oil port C forms a blocking slope 26. The valve body 8 forms an oil cavity communication port 25 to separate the inner cavity of the valve body 8 into a first oil cavity 11 connected to the oil port C and a second oil cavity 12 connected to the oil port D. The end of the valve body 8 away from the oil port D forms a plug installation port 20. The plug 19 is installed in the plug installation port 20 through a threaded structure. A sealing ring installation groove 22 in which the plug sealing ring 18 is installed is formed between the valve body 8 and the plug 19. The plug 19 is close to the oil port C. A spring seat 10 is installed at one end of the valve body 8, and a guide portion 17 is formed on the spring seat 10. The guide cavity 16 of the valve core structure is slidably matched with the guide portion 17. The spring seat 10 forms a flange step surface 13, and the outer surface of the valve core body 1 forms a support step surface 14. The spring 9 is sleeved on the outer wall surface of the valve core body 1 corresponding to the guide cavity 16. The two ends of the spring 9 respectively abut against the flange step surface 13 and the support step surface 14. The spring 9 provides the valve core structure with a force to drive it to move toward the oil port C, so that the blocking slope 26 abuts against the oil cavity connecting port 25, blocking the passage between the first oil cavity 11 and the second oil cavity 12. A plurality of sealing rings 21 are installed on the outer wall surface of the valve body 8 to improve the sealing performance of the flow valve after installation. A normally open throttle hole 23 is formed at the position of the valve body 8 corresponding to the first oil cavity 11.When high-pressure oil enters the oil port C, and the pressure of the hydraulic oil in the first oil chamber 11 on the valve core structure is less than the sum of the pressure of the hydraulic oil in the second oil chamber 12 and the spring 9 on the valve core structure, the blocking slope 26 abuts against the oil chamber connecting port 25, and the valve core structure blocks the passage between the first oil chamber 11 and the second oil chamber 12, so that the oil pressure in the first oil chamber 11 continues to increase. On the one hand, the hydraulic oil in the first oil chamber 11 flows out from the normally open throttle hole 23, slowing down the pressure-building speed of the first oil chamber 11, and on the other hand, it flows into the valve core inner cavity 27 from the throttle hole 6, further slowing down the pressure-building speed of the first oil chamber 11, and the hydraulic oil in the valve core inner cavity 27 provides the valve core structure with pressure to drive it to move toward the oil port C, thereby delaying the opening of the valve core structure. At the start time, when the pressure of the hydraulic oil in the first oil chamber 11 on the valve core structure is greater than the pressure of the hydraulic oil in the second oil chamber 12 and the valve core inner chamber 27 and the spring 9 on the valve core structure, the hydraulic oil in the oil port C pushes the valve core structure to move to the side away from the oil port C, and the blocking slope 26 is separated from the oil chamber connecting port 25, thereby opening the passage between the first oil chamber 11 and the second oil chamber 12, and the hydraulic oil in the oil port C enters the oil port D through the first oil chamber 11 and the second oil chamber 12. When the oil pressure of the oil port C is less than the sum of the oil pressures of the spring 9 and the oil port D, the hydraulic oil in the oil port D and the spring 9 push the valve core structure to move to the side close to the oil port C, and the blocking slope 26 abuts against the oil chamber connecting port 25 again, cutting off the passage between the oil ports C and D. In addition, a wrench hole 24 is formed at one end of the plug 19 away from the spring seat 10, so as to adjust the distance between the plug 19 and the valve core structure, change the compression amount of the spring 9, and thus change the opening pressure of the valve core structure.

[0054] Based on the valve core structure and flow valve provided by the above technical solution of the utility model, the utility model also provides a hydraulic system, which includes the valve core structure and / or flow valve mentioned above in the present application, so that the valve core structure of the hydraulic system is easy to process, and the throttle plug is firmly installed and not easy to fall off.

[0055] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0056] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A valve core structure, characterized in that: The invention comprises a valve core body (1), a throttle plug (2) and a retaining ring (3); the valve core body (1) forms an oil port A, an oil port B and a valve core oil chamber (4); the valve core oil chamber (4) connects the oil port A and the oil port B; the inner wall surface of the valve core body (1) forms a supporting flange (5); the inner wall surface of the valve core body (1) forms a retaining ring mounting groove (7) for mounting the retaining ring (3); one end of the throttle plug (2) abuts against the supporting flange (5); the other end of the throttle plug (2) abuts against the retaining ring (3); one end of the throttle plug (2) forms a throttling hole (6) for connecting the oil port A and the oil port B.

2. The valve core structure according to claim 1, characterized in that: The retaining ring (3) is a steel wire retaining ring.

3. The valve core structure according to claim 1, characterized in that: The retaining ring mounting groove (7) is arranged to be close to the oil port A or the oil port B.

4. A flow valve, characterized in that: The invention comprises a valve core structure according to any one of claims 1 to 3.

5. The flow valve according to claim 4, characterized in that: The invention also comprises a valve body (8), a spring (9) and a spring seat (10); the valve body (8) is formed with an oil port C, an oil port D, a first oil chamber (11) and a second oil chamber (12); the oil port C is connected to the oil port D through the first oil chamber (11) and the second oil chamber (12) in sequence; the valve core structure is arranged in the second oil chamber (12); the spring seat (10) forms a flange step surface (13); the valve core structure forms a support step surface (14); the spring (9) is arranged between the flange step surface (13) and the support step surface (14) to provide the valve core structure with a force to drive it to block the passage between the first oil chamber (11) and the second oil chamber (12).

6. The flow valve according to claim 5, characterized in that: The supporting flange (5) divides the valve core oil chamber (4) into a throttle plug installation chamber (15) and a guide chamber (16); the throttle plug installation chamber (15) is used to install the throttle plug (2); the spring seat (10) forms a guide portion (17); the spring (9) is sleeved on one end of the valve core body (1) close to the guide chamber (16); the guide portion (17) is slidably arranged in the guide chamber (16); the guide portion (17) and the throttle plug (2) are spaced apart so that the valve core structure and the guide portion (17) cooperate to form a valve core inner chamber (27).

7. The flow valve according to claim 6, characterized in that: The valve body (8) further comprises a plug (19); a plug mounting opening (20) is formed at one end of the valve body (8) away from the oil port C; the plug (19) is sealingly mounted at the plug mounting opening (20); and the spring seat (10) is arranged at one end of the plug (19) close to the second oil chamber (12).

8. The flow valve according to claim 7, characterized in that: It also comprises a plug sealing ring (18), and a sealing ring installation groove (22) for installing the plug sealing ring (18) is formed between the plug (19) and the valve body (8).

9. The flow valve according to claim 5, characterized in that: The valve body (8) is formed with a normally open throttle hole (23) communicating with the first oil chamber (11).

10. A hydraulic system, characterized in that: The invention comprises the valve core structure according to any one of claims 1 to 3 or the flow valve according to any one of claims 4 to 9.

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