Pilot-operated type proportional flow valve

Abstract

The utility model discloses a pilot-operated type proportional flow valve, and relates to the technical field of hydraulic pressure. The pilot-operated type proportional flow valve comprises a valve sleeve, a main valve element, a pilot-operated valve element and a driving assembly. The valve sleeve is provided with a valve cavity, an oil inlet and an oil outlet. The main valve element comprises a valve element body and a blocking piece, the valve element body is arranged in the valve cavity in a sliding mode and comprises a sliding channel, a first channel and a second channel, the sliding channel penetrates through the valve element body in the axial direction, the blocking piece blocks one end of the sliding channel, and the two ends of the first channel communicate with the valve cavity and the oil inlet correspondingly. The two ends of the second channel communicate with the sliding channel and the oil outlet correspondingly. The pilot valve element is arranged in the sliding channel in a sliding mode and provided with a blocking part. The driving assembly comprises a driving piece, and the driving piece can drive the pilot valve element to slide in the sliding channel. According to the pilot-operated type proportional flow valve, under the condition that the size precision of the main valve is guaranteed, the machining convenience of the main valve element is improved, and the product percent of pass is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pressure, in particular to a pilot-operated proportional flow valve. Background Art

[0002] A pilot-operated proportional flow valve consists of a main valve core and a pilot valve core. The pilot valve core slides within the main valve core and is controlled by a solenoid valve. Adjusting the pilot valve opening controls the flow rate through the pilot valve, thereby adjusting the threshold of the solenoid relief valve. To prevent the oil pressure at the oil outlet from affecting the pilot valve core, the oil hole connecting the main and pilot valve cores is designed as a blind hole.

[0003] However, the pilot-operated proportional flow valve has high precision, so the main valve core and the pilot valve core need to be matched very precisely. Therefore, the processing requirements for the blind hole of the main valve core are high, the processing is difficult, the product defect rate is high, and the cost is increased. Utility Model Content

[0004] The purpose of the utility model is to provide a pilot-operated proportional flow valve, which can improve the processing convenience and product qualification rate of the main valve core while ensuring the dimensional accuracy of the main valve.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A pilot-operated proportional flow valve, comprising:

[0007] A valve sleeve, wherein the valve sleeve is provided with a valve cavity, an oil inlet and an oil outlet;

[0008] A main valve core, the main valve core comprising a valve core body and a blocking member, the valve core body being slidably disposed in the valve cavity, the valve core body comprising a sliding channel, a first channel, and a second channel, the sliding channel axially penetrating the valve core body, the blocking member blocking one end of the sliding channel, the two ends of the first channel respectively communicating with the valve cavity and the oil inlet, and the two ends of the second channel respectively communicating with the sliding channel and the oil outlet;

[0009] A pilot valve core is slidably disposed in the sliding channel, and the pilot valve core is provided with a blocking portion;

[0010] The driving assembly includes a driving member connected to the pilot valve core. The driving member can drive the pilot valve core to slide in the sliding channel so that the blocking portion blocks or opens the opening of the sliding channel away from one end of the blocking member.

[0011] As an optional solution of the above-mentioned pilot-operated proportional flow valve, the blocking member is interference-fitted with the sliding channel.

[0012] As an optional solution of the above-mentioned pilot-operated proportional flow valve, the blocking member includes a fixed portion and a guide portion, the fixed portion is in sealing contact with the inner wall of the sliding channel, and the diameter of the guide portion gradually decreases in a direction away from the fixed portion.

[0013] As an optional solution for the above-mentioned pilot-operated proportional flow valve, the valve core body is provided with multiple fixed protrusions, the multiple fixed protrusions are located in the sliding channel, and the fixed protrusions are arranged to protrude inward relative to the inner wall of the sliding channel to abut and limit the blocking member.

[0014] As an optional solution of the above-mentioned pilot-operated proportional flow valve, the valve core body includes a crushing portion, the crushing portion is located at an end of the valve core body away from the pilot valve core, and the fixing protrusion is crushed into shape by the crushing portion.

[0015] As an optional solution of the above-mentioned pilot-operated proportional flow valve, the pilot valve core is provided with a third channel, and the third channel is connected to the valve cavity and the sliding channel.

[0016] As an optional solution of the above-mentioned pilot proportional flow valve, the pilot valve core is further provided with a communication groove, and when the blocking portion opens the opening of the sliding channel away from one end of the blocking member, the communication groove connects the second channel and the valve cavity.

[0017] As an optional solution for the above-mentioned pilot-operated proportional flow valve, the main valve core also includes a first damping hole, the two ends of which are opened on the outer wall of the main valve core and the inner wall of the first channel, and the outer wall of the main valve core is provided with a connecting groove, which connects the oil inlet and the first damping hole.

[0018] As an optional solution for the above-mentioned pilot proportional flow valve, the main valve core also includes a second damping hole, and the valve sleeve is provided with a pressure relief hole. When the main valve core slides in the valve cavity and re-abuts against the pilot valve core so that the second channel is blocked, the second damping hole is connected to the pressure relief hole.

[0019] As an optional solution of the above-mentioned pilot-operated proportional flow valve, the main valve core is provided with a plurality of the first channels and / or the second channels at intervals along the circumferential direction.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a pilot-operated proportional flow valve. In this pilot-operated proportional flow valve, the main valve core has a sliding channel with both ends extending to the surface. One end of the sliding channel is blocked by a blocking member. The pilot valve core slides within the sliding channel. The blocking member prevents the oil pressure at the oil outlet from affecting the pilot valve core, ensuring the normal operation of the pilot valve core. Furthermore, by blocking one end of the sliding channel with the blocking member to form a blind hole structure, the main valve core only needs to be machined through the sliding channel. This improves the ease of machining and product qualification rate of the main valve core while maintaining the dimensional accuracy of the main valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a first sectional view of the pilot-operated proportional flow valve provided by the utility model;

[0023] Figure 2 This is a second sectional view of the pilot-operated proportional flow valve provided by the utility model;

[0024] Figure 3 This is a structural diagram of the main valve core provided by the utility model;

[0025] Figure 4 This is a structural diagram of the pilot valve core provided by the utility model;

[0026] Figure 5 It is a structural schematic diagram of the blocking piece provided by the utility model.

[0027] In the picture:

[0028] 1. Valve sleeve; 11. Valve chamber; 12. Oil inlet; 13. Oil outlet; 14. Pressure relief hole; 15. Crushing groove;

[0029] 2. Main valve core; 21. Valve core body; 211. Sliding channel; 212. First channel; 213. Second channel; 22. Blocking member; 221. Fixing portion; 222. Guide portion; 23. First damping orifice; 24. Connecting groove; 25. Second damping orifice; 26. First annular groove; 27. Second annular groove;

[0030] 3. Pilot valve core; 31. Blocking portion; 32. Communication groove; 33. Third channel; 34. Third damping hole;

[0031] 4. Driving assembly; 41. Driving member; 42. Elastic member. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0034] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0035] Unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0037] This embodiment provides a pilot-operated proportional flow valve, such as Figures 1 to 3As shown, the pilot-operated proportional flow valve includes a valve sleeve 1, a main valve core 2, and a pilot valve core 3. The valve sleeve 1 defines a valve chamber 11 and an oil inlet 12 and an oil outlet 13 connected to the valve chamber 11. The main valve core 2 slides within the valve chamber 11 and can abut against the outer edge of the oil outlet 13. The main valve core 2 can connect the oil inlet 12 and the oil outlet 13 or isolate the oil inlet 12 from the oil outlet 13 by sliding. The main valve core 2 has a sliding channel 211, and the pilot valve core 3 is disposed within the sliding channel 211. By controlling the sliding of the pilot valve core 3 within the main valve core 2, the opening of the pilot-operated proportional flow valve can be controlled with a relatively small force.

[0038] In the prior art, to prevent the oil pressure at the oil outlet 13 from affecting the pilot valve core 3, the sliding passage 211 between the main valve core 2 and the pilot valve core 3 must be designed as a blind hole. However, pilot-operated proportional flow valves require high precision, so the main valve core 2 and the pilot valve core 3 must fit together very precisely. This places high demands on the processing of the blind hole of the main valve core 2, making it difficult to process, resulting in a high defect rate and increased costs.

[0039] like Figures 1 to 3 As shown, in order to solve the above problems, the main valve core 2 includes a valve core body 21 and a sealing member 22. The valve core body 21 is slidably arranged in the valve cavity 11. The valve core body 21 includes a sliding channel 211, a first channel 212 and a second channel 213. The sliding channel 211 penetrates the valve core body 21 axially. The sealing member 22 blocks one end of the sliding channel 211. The two ends of the first channel 212 are respectively connected to the valve cavity 11 and the oil inlet 12, and the two ends of the second channel 213 are respectively connected to the sliding channel 211 and the oil outlet 13. The pilot valve core 3 is provided with a sealing portion 31. By controlling the movement of the pilot valve core 3, the sealing portion 31 can block or open the opening of the sliding channel 211 away from one end of the sealing member 22.

[0040] In the initial state, the blocking portion 31 of the pilot valve core 3 blocks the sliding channel 211 of the main valve core 2. At this time, the valve chamber 11 is in a closed state, and the oil pressure of the hydraulic oil in the valve chamber 11 will cause the main valve core 2 to only abut against the outer edge of the oil outlet 13, so that the pilot proportional flow valve is in a closed state; when the pilot valve core 3 is driven to move relative to the main valve core 2, the blocking portion 31 and the sliding channel 211 are separated from the opening at one end of the blocking member 22, and the hydraulic oil at the oil inlet 12 will enter the valve chamber 11 through the first channel 212, and then flow out of the oil outlet 13 after passing through the second channel 213. At this time, the oil pressure in the valve chamber 11 is greatly reduced, so that the hydraulic oil can push the main valve core 2 to move, and the main valve core 2 is separated from the outer edge of the oil outlet 13. At this time, the oil inlet 12 is connected to the oil outlet 13, and the pilot proportional flow valve is in an open state.

[0041] In this pilot-operated proportional flow valve, one end of the sliding channel 211 is blocked by a blocking member 22. The pilot valve core 3 slides within the sliding channel 211. The blocking member 22 prevents the oil pressure at the oil outlet 13 from affecting the pilot valve core 3, ensuring the normal operation of the pilot valve core 3. Furthermore, by blocking one end of the sliding channel 211 with the blocking member 22, a blind hole structure is formed, requiring only the through-channel 211 to be machined for the main valve core 2. This improves the ease of machining and product quality of the main valve core 2 while maintaining the dimensional accuracy of the main valve.

[0042] To ensure stable sliding of the pilot valve core 3 within the sliding channel 211, the end of the pilot valve core 3 closest to the blocking member 22 slides against the inner wall of the sliding channel 211 with a small clearance. In this embodiment, the pilot valve core 3 is further provided with a communication groove 32. When the blocking portion 31 opens the end of the sliding channel 211 away from the blocking member 22, the communication groove 32 connects the second channel 213 and the valve chamber 11, ensuring that hydraulic oil in the valve chamber 11 can enter the second channel 213.

[0043] In this embodiment, the main valve core 2 also includes a first damping hole 23, the two ends of which are opened on the outer wall of the main valve core 2 and the inner wall of the first channel 212, and the outer wall of the main valve core 2 is provided with a connecting groove 24, which connects the oil inlet 12 and the first damping hole 23.

[0044] The hydraulic oil can enter the first damping hole 23 through the gap between the connecting groove 24 and the valve sleeve 1, and enter the valve chamber 11 through the first channel 212. Moreover, since the first damping hole 23 can reduce the pressure of the hydraulic oil, that is, when the main valve core 2 is moving, the first damping hole 23 can provide damping force for the movement of the main valve core 2, so that the movement of the main valve core 2 is more stable and the position where the main valve core 2 stays is more precise.

[0045] When the main valve core 2 moves to the position of the maximum opening, the main valve core 2 will be limited. At this time, the main valve core 2 will not continue to move. In order to avoid excessive pressure of the hydraulic oil on the end of the main valve core 2 away from the oil outlet 13, which will cause the main valve core 2 to be unstable, the main valve core 2 also includes a second damping hole 25, and the valve sleeve 1 is provided with a pressure relief hole 14. When the main valve core 2 slides in the valve cavity 11 and re-abuts the pilot valve core 3 so that the second channel 213 is blocked, the second damping hole 25 is connected to the pressure relief hole 14.

[0046] That is to say, when the main valve core 2 moves to the position of maximum opening and is limited, the hydraulic oil entering the first channel 212 through the first damping hole 23 and the hydraulic oil in the valve chamber 11 can be discharged through the second damping hole 25 and the pressure relief hole 14, ensuring that the pressure at the end of the main valve core 2 away from the oil outlet 13 is reduced, so that the hydraulic oil at the oil inlet 12 can stably press the main valve core 2 at the position of maximum opening.

[0047] Furthermore, the outer circumference of the main valve core 2 is provided with a first annular groove 26 and a second annular groove 27 extending in the circumferential direction. The first damping orifice 23 is provided in the first annular groove 26, and the second damping orifice 25 is provided in the second annular groove 27, to ensure smooth flow of hydraulic oil. A connecting groove 24 is provided through the sidewall of the first annular groove 26 on the side closest to the oil inlet 12, and multiple connecting grooves 24 are provided at intervals along the circumference.

[0048] like Figure 1 、 Figure 2 and Figure 4 As shown, the diameter of the blocking portion 31 gradually increases as it moves away from the main valve core 2. This structure allows the end of the blocking portion 31 closest to the main valve core 2 to enter the sliding channel 211 first. The pilot valve core 3 then moves to a position where the inclined surface of the blocking portion 31 abuts the outer edge of the opening of the sliding channel 211 to complete the blocking of the sliding channel 211. This improves the reliability of the seal, reduces the requirements for machining accuracy, and facilitates machining.

[0049] It is worth noting that the blocking member 22 needs to be sealed and connected to the sliding channel 211, and the reliability of the connection must be ensured. In some embodiments, the blocking member 22 can be welded to the sliding channel 211, or can be fixed with fixing members such as screws, and a sealing ring is provided between the blocking member 22 and the inner wall of the sliding channel 211.

[0050] In this embodiment, the blocking member 22 and the sliding channel 211 are interference fit. This structure can ensure both the reliability of the connection between the blocking member 22 and the sliding channel 211 and the sealing between the blocking member 22 and the sliding channel 211. It also has a simple structure and is easy to process.

[0051] Since the blocking member 22 and the sliding channel 211 have an interference fit, the diameter of the blocking member 22 should be slightly larger than the inner diameter of the sliding channel 211. During assembly, when the blocking member 22 has not entered the sliding channel 211, it is necessary to make the blocking member 22 roughly aligned with the sliding channel 211. Figure 1 、 Figure 2 and Figure 5 As shown, for ease of assembly, the blocking member 22 includes a fixing portion 221 and a guiding portion 222 . The fixing portion 221 is in sealing contact with the inner wall of the sliding channel 211 , and the diameter of the guiding portion 222 gradually decreases in a direction away from the fixing portion 221 .

[0052] The guide portion 222 can enter the sliding channel 211 first, and then in the process of pressing the blocking piece 22 completely into the sliding channel 211, the guide portion 222 can slide and abut against the outer edge of the opening of the sliding channel 211, so that the blocking piece 22 slides into the sliding channel 211, and the fixing portion 221 is interference fit with the sliding channel 211, completing the assembly and sealing.

[0053] To prevent the blocking member 22 from falling out of the sliding channel 211 under the action of oil pressure, the valve core body 21 is provided with multiple fixing protrusions. These fixing protrusions are located in the sliding channel 211 and protrude inwardly relative to the wall of the sliding channel 211 to abut and limit the blocking member 22. These fixing protrusions can limit the blocking member 22 in position, ensuring that the blocking member 22 does not fall out of the sliding channel 211.

[0054] It is understandable that the fixing protrusion needs to be arranged in the sliding channel 211 after the blocking member 22 is installed in the sliding channel 211. In some embodiments, the fixing protrusion can be formed by a screw, a pin, etc.

[0055] In this embodiment, the valve core body 21 includes a crushing portion, which is located at the end of the valve core body 21 away from the pilot valve core 3, and the fixed protrusion is crushed into shape by the crushing portion. That is, through mechanical processing, the crushing portion of the valve core body 21 is crushed to form a crushing groove 15, and at the same time, a fixed protrusion corresponding to the crushing groove 15 is formed on the inner wall of the sliding channel 211, thereby fixing the sealing part 22, improving processing efficiency and reducing costs.

[0056] like Figure 1 and Figure 2 As shown, the pilot valve core 3 defines a third passage 33, which communicates with the valve cavity 11 and the sliding passage 211. It will be appreciated that the third passage 33 allows the hydraulic oil between the pilot valve core 3 and the blocking member 22 to communicate with the hydraulic oil in the valve cavity 11, thereby ensuring that the oil pressure difference across the pilot valve core 3 is not excessive, allowing the pilot valve core 3 to move relative to the main valve core 2.

[0057] like Figure 1 、 Figure 2 and Figure 4 As shown, the pilot valve core 3 is provided with a third damping hole 34, which connects the valve chamber 11 and the sliding channel 211. The third damping hole 34 can reduce the pressure of the hydraulic oil. That is to say, no matter which direction the pilot valve core 3 moves, the third damping hole 34 can provide a damping force for the movement of the pilot valve core 3, so that the movement of the pilot valve core 3 is more stable and the position where the pilot valve core 3 stays is more precise.

[0058] In order to increase the amount of hydraulic oil reaching the oil outlet 13 through the connecting groove 32 and the second channel 213 when the pilot valve core 3 moves, the main valve core 2 is provided with a plurality of first channels 212 at intervals along the circumference, which is equivalent to increasing the cross-sectional area of ​​the flow channel of the hydraulic oil between the valve cavity 11 and the oil outlet 13, thereby increasing the amount of circulating hydraulic oil.

[0059] Similarly, the main valve core 2 is provided with a plurality of second passages 213 at intervals along its circumference. When the pilot valve core 3 blocks the sliding passage 211, the oil pressure at the end of the main valve core 2 facing away from the oil outlet 13 increases, thereby driving the main valve core 2 to block the oil outlet 13. The plurality of second passages 213 can increase the movement speed of the main valve core 2, thereby improving the regulation efficiency.

[0060] It is worth noting that the movement of the pilot valve core 3 can be achieved through manual control or automatic control by setting an independent structure.

[0061] In this embodiment, the pilot-operated proportional flow valve further includes a drive assembly 4 , which includes a drive member 41 . The drive member 41 is connected to the pilot valve core 3 , and the drive member 41 can drive the pilot valve core 3 to slide in the sliding channel 211 .

[0062] Specifically, the drive assembly 4 also includes an electromagnetic coil, and the drive part 41 is an armature. The electromagnetic coil is sleeved on the valve sleeve 1, and the armature is passed through the electromagnetic coil. By energizing the electromagnetic coil, the armature can drive the pilot valve core 3 to move away from the main valve core 2, thereby connecting the connecting groove 32 to the second channel 213 and the valve chamber 11, and by controlling the current of the electromagnetic coil, the threshold of the pilot proportional flow valve can be adjusted.

[0063] Furthermore, the drive assembly 4 further includes an elastic member 42, which abuts the valve sleeve 1 and the pilot valve core 3 to move the pilot valve core 3 toward the main valve core 2. The elastic member 42 can drive the pilot valve core 3 and the main valve core 2 to reset after the electromagnetic coil is de-energized, thereby closing the pilot proportional flow valve.

[0064] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A pilot-operated proportional flow valve, characterized in that: include: A valve sleeve (1), wherein the valve sleeve (1) is provided with a valve cavity (11), an oil inlet (12) and an oil outlet (13); A main valve core (2), the main valve core (2) comprising a valve core body (21) and a blocking member (22), the valve core body (21) being slidably disposed in the valve cavity (11), the valve core body (21) comprising a sliding channel (211), a first channel (212) and a second channel (213), the sliding channel (211) penetrating the valve core body (21) in the axial direction, the blocking member (22) blocking one end of the sliding channel (211), the two ends of the first channel (212) being respectively connected to the valve cavity (11) and the oil inlet (12), and the two ends of the second channel (213) being respectively connected to the sliding channel (211) and the oil outlet (13); A pilot valve core (3) is slidably disposed in the sliding channel (211), and the pilot valve core (3) is provided with a blocking portion (31); A drive assembly (4) includes a drive member (41), wherein the drive member (41) is connected to the pilot valve core (3), and the drive member (41) is capable of driving the pilot valve core (3) to slide in the sliding channel (211), so that the blocking portion (31) blocks or opens the opening of the sliding channel (211) away from one end of the blocking member (22).

2. The pilot-operated proportional flow valve according to claim 1, characterized in that: The blocking member (22) is interference-fitted with the sliding channel (211).

3. The pilot-operated proportional flow valve according to claim 1, characterized in that: The blocking member (22) comprises a fixing portion (221) and a guiding portion (222); the fixing portion (221) is in sealing contact with the inner wall of the sliding channel (211); and the diameter of the guiding portion (222) gradually decreases in a direction away from the fixing portion (221).

4. The pilot-operated proportional flow valve according to claim 1, characterized in that: The valve core body (21) is provided with a plurality of fixed protrusions, the plurality of fixed protrusions are located in the sliding channel (211), and the fixed protrusions are provided to protrude inwardly relative to the inner wall of the sliding channel (211) to abut and limit the blocking member (22).

5. The pilot-operated proportional flow valve according to claim 4, characterized in that: The valve core body (21) includes a crushing portion, which is located at one end of the valve core body (21) away from the pilot valve core (3), and the fixing protrusion is crushed and formed by the crushing portion.

6. The pilot-operated proportional flow valve according to claim 1, characterized in that: The pilot valve core (3) is provided with a third channel (33), and the third channel (33) is connected with the valve cavity (11) and the sliding channel (211).

7. The pilot-operated proportional flow valve according to claim 1, characterized in that: The pilot valve core (3) is further provided with a communication groove (32). When the blocking portion (31) opens the opening of the sliding channel (211) away from one end of the blocking member (22), the communication groove (32) connects the second channel (213) and the valve cavity (11).

8. The pilot-operated proportional flow valve according to claim 1, characterized in that: The main valve core (2) further comprises a first damping hole (23), the two ends of which are opened on the outer wall of the main valve core (2) and the inner wall of the first channel (212), and the outer wall of the main valve core (2) is provided with a connecting groove (24), and the connecting groove (24) is connected with the oil inlet (12) and the first damping hole (23).

9. The pilot-operated proportional flow valve according to claim 1, characterized in that: The main valve core (2) further includes a second damping hole (25), and the valve sleeve (1) is provided with a pressure relief hole (14). When the main valve core (2) slides in the valve cavity (11) and abuts against the pilot valve core (3) again so that the second channel (213) is blocked, the second damping hole (25) is communicated with the pressure relief hole (14).

10. The pilot-operated proportional flow valve according to any one of claims 1 to 9, characterized in that: The main valve core (2) is provided with a plurality of the first channels (212) and / or the second channels (213) at intervals along the circumferential direction.

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