A proportional flow valve

Abstract

The utility model relates to valve technical field discloses a proportional flow valve, including magnetism guide bush, moving iron, adjusting rod, valve sleeve, proportional valve core and compensation valve core, magnetism guide bush has mounting hole and accommodation chamber, moving iron is installed in the accommodation chamber and slides, the part of adjusting rod is located in mounting hole and is provided with elastic member between moving iron, adjusting rod can move along the extension direction of mounting hole to adjust the pre -tightening force of elastic member, valve sleeve is assembled on magnetism guide bush and is opened valve port A, valve port B and valve port C, one end of proportional valve core is connected with moving iron, the other end is located in valve sleeve and is opened axial oil hole and side hole, fluid can flow out from valve port C through valve port A, axial oil hole and side hole, compensation valve core is located in valve sleeve, can move along the axial movement of valve sleeve. The proportional flow valve can adjust the threshold of valve through adjusting rod to make it satisfy the stipulated range, need not to carry out high accuracy control to spring length, rigidity and the like parameter, has reduced the processing difficulty, has improved the yield of product simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically to a proportional flow valve. Background Technology

[0002] Proportional flow valves, controlled by proportional electromagnets, can proportionally control parameters such as pressure and flow rate in hydraulic systems. Proportional control involves adjusting the current flowing through the coil of the proportional electromagnet to control the movement of the valve core, thereby changing the valve opening. Existing proportional flow valves have fixed threshold values, determined after assembly. These threshold values ​​significantly impact valve performance. Precise control of spring length, stiffness, and the depth of spring mounting holes on the moving and stationary iron cores is required to maintain the threshold within a certain range, placing high demands on manufacturing processes. However, achieving simultaneous control of these parameters within reasonable ranges during production is extremely difficult, resulting in low product yield. Therefore, there is an urgent need for a proportional flow valve with an adjustable threshold that can meet specified threshold ranges without requiring precise parameter control during production, thus reducing manufacturing difficulty and improving product yield. Utility Model Content

[0003] The purpose of this invention is to provide a proportional flow valve that can adjust the threshold, improve threshold consistency, thereby reducing production difficulty and increasing yield.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a proportional flow valve, comprising: a magnetic sleeve and a moving iron, the magnetic sleeve having a mounting hole and a receiving cavity, the moving iron being axially slidably mounted in the receiving cavity; an adjusting rod, at least a portion of which is located in the mounting hole, an elastic element being provided between the adjusting rod and the moving iron, the adjusting rod being movable along the extension direction of the mounting hole to adjust the preload of the elastic element; a valve sleeve, assembled on the magnetic sleeve, the valve sleeve having valve port A, valve port B and valve port C; a proportional valve core, one end of which is connected to the moving iron, the other end of which is located inside the valve sleeve and has an axial oil passage hole and a side hole, fluid being able to flow out from valve port C through valve port A, the axial oil passage hole and the side hole; and a compensating valve core, disposed inside the valve sleeve, the compensating valve core being movable along the axial direction of the valve sleeve.

[0005] As an alternative, a limiting groove is formed on the cavity wall of the accommodating cavity, and the proportional flow valve further includes a limiting member, at least a portion of which is embedded in the limiting groove. A portion of the limiting member protrudes radially relative to the groove wall of the limiting groove, and one end of the moving iron abuts against the limiting member and limits its movement along the direction of the moving iron's movement.

[0006] As an alternative, the magnetic sleeve includes a magnetic tube and a threaded sleeve, one end of which is fitted onto the magnetic tube and threadedly connected to it, and a first sealing element is provided at the threaded connection between the threaded sleeve and the magnetic tube.

[0007] As an alternative, the moving iron has a connecting groove at one end near the proportional valve core, and the proportional valve core has a connector that matches the connecting groove, the connector being snapped into the connecting groove.

[0008] As an alternative, the adjusting rod has a limiting head at one end near the moving iron, at least a portion of the elastic element is sleeved on the limiting head, the moving iron has a groove at one end near the adjusting rod, at least a portion of the elastic element is embedded in the groove, one end of the elastic element abuts against the shoulder of the limiting head, and the other end abuts against the bottom of the groove.

[0009] As an alternative, the proportional flow valve further includes a second seal, the adjusting rod having a circumferential mounting groove, at least a portion of the second seal being mounted in the mounting groove, with one side of the second seal abutting the bottom of the mounting groove along the radial direction of the adjusting rod, and the other side of the second seal abutting the wall of the mounting hole.

[0010] As an alternative, the proportional flow valve further includes a nut that is threadedly connected to the portion of the adjusting rod located outside the magnetic tube, and one end of the nut abuts against the magnetic tube.

[0011] As an alternative, the proportional flow valve further includes a valve seat located at the end of the valve sleeve near the moving iron. At least a portion of the valve seat passes through the compensating valve core. The valve seat has a valve seat hole communicating with the valve port C, and one end of the proportional valve core passes through the valve seat.

[0012] As an alternative, the proportional flow valve includes an initial state in which the side hole and the valve seat hole are misaligned and not in communication.

[0013] As an optional embodiment, the proportional flow valve further includes a spring seat and a limiting sleeve. At least a portion of the spring seat passes through the compensating valve core, and one end of the spring seat abuts against the valve seat. A compensating spring is provided between the spring seat and the compensating valve core. One end of the compensating spring abuts against the spring seat, and the other end abuts against the compensating valve core. The limiting sleeve passes through the end of the valve sleeve, and the compensating valve core abuts against the limiting sleeve under the elastic force of the compensating spring.

[0014] The beneficial effects of this utility model are: The proportional flow valve provided by this utility model has a pull-type structure. An elastic element is positioned between a magnetic tube and a moving iron. An adjusting rod passes through the magnetic tube, with one end of the rod abutting against the elastic element. This allows direct adjustment of the elastic element's preload, enabling adjustable threshold force and improving threshold consistency. The threshold can be adjusted later to ensure it meets the specified range. Therefore, high-precision control of parameters such as spring length, stiffness, and spring mounting hole depth is unnecessary during production, reducing processing difficulty and effectively improving product yield. Attached Figure Description

[0015] Figure 1 A cross-sectional view of the proportional flow valve provided by this utility model in its initial state, with the coil assembly hidden. Figure 2 A cross-sectional view of the proportional flow valve provided by this utility model in its working state, with the coil assembly hidden. Figure 3 A cross-sectional view of the moving iron of the proportional flow valve provided by this utility model; Figure 4 A cross-sectional view of the proportional valve core of the proportional flow valve provided by this utility model; Figure 5 A partially enlarged view of the mounting structure of the proportional flow valve limiting component provided by this utility model; Figure 6 A partially enlarged view of the mounting structure of the second sealing element of the proportional flow valve provided in this utility model; Figure 7 A cross-sectional view of the proportional flow valve provided by this utility model.

[0016] In the picture: 1. Magnetic sleeve; 110. Magnetic tube; 120. Threaded sleeve; 130. Mounting hole; 140. Receiving cavity; 1401. Limiting groove; 2. Moving iron; 21. Connecting groove; 22. Groove; 3. Adjusting rod; 31. Limit head; 32. Mounting groove; 4. Elastic element; 5. Valve sleeve; 6. Proportional valve core; 61. Axial oil passage hole; 62. Side hole; 63. Connector; 7. Compensating valve core; 71. Right annular surface; 72. Left annular surface; 8. Limiting element; 9. First sealing element; 10. Second sealing element; 11. Nut; 12. Valve seat; 121. Valve seat bore; 13. Spring seat; 14. Limit sleeve; 15. Compensating spring; 16. Coil; 17. Fastener. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0018] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0019] like Figures 1-7 As shown, this utility model provides a proportional flow valve, including a magnetic sleeve 1, a moving iron 2, an adjusting rod 3, a valve sleeve 5, a proportional valve core 6, and a compensating valve core 7. The magnetic sleeve 1 has a coaxially arranged mounting hole 130 and a receiving cavity 140. The moving iron 2 is axially slidably installed in the receiving cavity 140. The valve sleeve 5 is fixedly connected to one end of the magnetic sleeve 1 near the receiving cavity 140 and has valve ports A, B, and C. One end of the proportional valve core 6 is connected to the moving iron 2, and the other end is axially slidably installed in the valve sleeve 5. The proportional valve core 6 has an axial oil passage hole 61 and a side hole 62. Fluid can flow out from the valve port C through the valve port A, the axial oil passage hole 61, and the side hole 62. The compensating valve core 7 is located in the valve sleeve 5 and can move axially along the valve sleeve 5 under the pressure difference between the valve ports A and C, thereby adjusting the opening amount of the valve ports B and C.

[0020] Among them, reference Figure 1 The accommodating cavity 140 is located at the end of the magnetic sleeve 1 near the valve sleeve 5, and the mounting hole 130 is located at the end of the magnetic sleeve 1 away from the valve sleeve 5 and communicates with the accommodating cavity 140. The radial dimension of the mounting hole 130 is smaller than the radial dimension of the accommodating cavity 140. The moving iron 2 is axially slidably installed in the accommodating cavity 140. At least part of the adjusting rod 3 passes through the mounting hole 130 and is adjustablely connected to the hole wall of the mounting hole 130.

[0021] In this embodiment, the adjusting rod 3 is threadedly connected to the wall of the mounting hole 130. Specifically, the wall of the mounting hole 130 is machined with a first threaded section, and the outer peripheral wall of the adjusting rod 3 is machined with a second threaded section. One end of the adjusting rod 3 is screwed into the mounting hole 130 so that the first threaded section and the second threaded section engage, thereby achieving a threaded connection between the adjusting rod 3 and the mounting hole 130. The other end of the adjusting rod 3 is located outside the mounting hole 130, and the portion outside the mounting hole 130 is threadedly connected to a nut 11. One end of the nut 11 abuts against the left end face of the magnetic sleeve 1 to lock the position of the adjusting rod 3 and prevent it from loosening due to vibration during valve operation.

[0022] An elastic element 4 is provided between the adjusting rod 3 and the moving iron 2. The end of the adjusting rod 3 near the moving iron 2 has a limiting head 31, the radial dimension of which is smaller than that of the adjusting rod 3, thus forming an annular shoulder. At least a portion of one end of the elastic element 4 is fitted onto the limiting head 31 and abuts against the shoulder of the limiting head 31. A groove 22 is formed at the end of the moving iron 2 near the adjusting rod 3. At least a portion of the other end of the elastic element 4 is embedded in the groove 22 and abuts against the bottom of the groove 22, thereby achieving bidirectional limiting of the elastic element 4 and preventing it from shifting during compression / reset. In this embodiment, the elastic element 4 is a spring; other embodiments include, but are not limited to, this structure.

[0023] By rotating the adjusting rod 3, the depth to which the adjusting rod 3 is screwed into the mounting hole 130 can be changed, allowing the adjusting rod 3 to move along the extension direction of the mounting hole 130, thereby adjusting the compression of the elastic element 4 and thus adjusting the preload of the elastic element 4, which is the threshold of the proportional flow valve. This eliminates the need for high-precision control of parameters such as spring length and stiffness during the production process to ensure that the valve reaches the threshold range. Even if there is a deviation in the threshold, the preload of the elastic element 4 can still be adjusted by adjusting the adjusting rod 3, so that the threshold of the valve meets the requirements.

[0024] Furthermore, to prevent hydraulic oil leakage from the gap between the mounting hole 130 and the adjusting rod 3, the proportional flow valve is also equipped with a second seal 10. (Refer to...) Figure 6 The adjusting rod 3 has a circumferential mounting groove 32. At least a portion of the second seal 10 is embedded in the mounting groove 32. Along the radial direction of the adjusting rod 3, one side of the second seal 10 abuts against the bottom of the mounting groove 32, and the other side abuts against the wall of the mounting hole 130, thereby achieving a radial seal between the mounting hole 130 and the adjusting rod 3, effectively blocking the leakage path of hydraulic oil. In this embodiment, the second seal 10 is an O-ring.

[0025] Reference Figure 1 , Figure 2 The valve sleeve 5 is threaded to the right end of the magnetic sleeve 1. The valve sleeve 5 has valve ports A, B, and C, with valve ports B and C spaced apart on the side wall of the valve sleeve 5. Valve port A is located on the end face of the valve sleeve 5 away from the magnetic sleeve 1. The valve sleeve 5 has an axially penetrating mounting cavity. One end of the proportional valve core 6 is connected to the moving iron 2, and the other end is axially slidably disposed in the mounting cavity and has an axial oil passage hole 61 and a side hole 62. Fluid can flow out from valve port C through valve port A, the axial oil passage hole 61, and the side hole 62 in sequence. Specifically, refer to Figure 3 , Figure 4The proportional valve core 6 is connected to the moving iron 2 by having a connecting groove 21 at one end of the moving iron 2 near the proportional valve core 6. The proportional valve core 6 has a connector 63 that matches the connecting groove 21. The connector 63 is engaged within the connecting groove 21. Therefore, when the moving iron 2 moves, it can drive the proportional valve core 6 to move together, thereby changing the opening size of the side hole 62 of the proportional valve core 6. In this embodiment, the connecting groove 21 completely penetrates the moving iron 2 radially, and its axial section is "T"-shaped. The connector 63 is a "T"-shaped structure that matches the connecting groove 21. The connector 63 can be engaged into the connecting groove 21 from the through opening in the connecting groove 21 radially. The connector 63 and the connecting groove 21 can be fitted with a clearance fit or an interference fit. After engagement, the axial sides of the connector 63 are limited by the groove wall of the connecting groove 21, so it will not come out axially. The aforementioned axial section refers to the section passing through the axis of the moving iron 2 and perpendicular to the through direction of the connecting groove 21.

[0026] The compensating valve core 7 is axially slidably disposed within the mounting cavity. Under the pressure difference between valve port A and valve port C, the compensating valve core 7 can move axially along the valve sleeve 5 to adjust the opening amount of valve port B and valve port C. A compensating spring 15 is provided inside the compensating valve core 7, which can be compressed when the compensating valve core 7 moves axially.

[0027] When oil enters through valve port A, the hydraulic pressure at the inlet side of valve port A acts on the right annular surface 71 of the compensating valve core 7 (assuming the hydraulic pressure is F1), and the hydraulic pressure at the outlet side of valve port B acts on the left annular surface 72 of the compensating valve core 7 (assuming the hydraulic pressure is F2). At this time, due to the pressure difference generated by the hydraulic oil flow, F1 > F2, and the compensating valve core 7 moves to the left, compressing the compensating spring 15 (assuming the spring force is ΔP). At this point, an approximate equation can be formed: ΔP = F1 - F2. During this process, the compensating valve core 7 keeps the pressure difference balanced, and the flow rate at valve port C is determined by the opening size of the side hole 62 of the proportional valve core 6, unaffected by the load downstream of valve port C.

[0028] Furthermore, the proportional flow valve also includes a valve seat 12, a spring seat 13, and a limiting sleeve 14. The valve seat 12 is located at the end of the valve sleeve 5 near the moving iron 2, and at least partially passes through the compensating valve core 7. A valve seat hole 121 communicating with the valve port C is provided on the peripheral side wall of the valve seat 12. One end of the proportional valve core 6 passes through the valve seat 12 and can slide axially along the inner cavity of the valve seat 12. In the initial state, i.e., when no power is applied, refer to... Figure 1 The side hole 62 and the valve seat hole 12 are misaligned and not connected; in the working state, i.e. when energized, refer to... Figure 2The moving iron 2 moves to the left under the action of electromagnetic force, which in turn drives the proportional valve core 6 to move to the left, making the side hole 62 connected to the valve seat hole 121. At least a portion of the spring seat 13 passes through the compensating valve core 7, and one end of it abuts against the valve seat 12. The compensating spring 15 is sleeved on the spring seat 13, with one end of the compensating spring 15 abutting against the spring seat 13 and the other end abutting against the compensating valve core 7. The limiting sleeve 14 passes through the end of the valve sleeve 5 away from the proportional valve core 6. The compensating valve core 7 abuts against the limiting sleeve 14 under the elastic force of the compensating spring 15. The right end of the limiting sleeve 14 is provided with a retaining ring to prevent the components inside the valve sleeve 5 from falling out.

[0029] Furthermore, the proportional flow valve also includes a limiting element 8 to limit the extreme positions of the moving iron 2. Specifically, refer to... Figure 1 , Figure 6 A limiting groove 1401 is formed on the cavity wall of the accommodating cavity 140. At least a portion of the limiting member 8 is embedded in the limiting groove 1401, and at least a portion of the limiting member 8 protrudes outward relative to the groove wall of the limiting groove 1401. Along the direction of movement of the moving iron 2, under the elastic force of the elastic member 4, one end of the moving iron 2 abuts against the limiting member 8. In order to facilitate the assembly of the limiting member 8, in this embodiment, the magnetic sleeve 1 includes a magnetic tube 110 and a threaded sleeve 120. One end of the threaded sleeve 120 is sleeved on the end of the magnetic tube 110 away from the adjusting rod 3 and is threadedly connected to the magnetic tube 110. During assembly, the limiting member 8 can be installed first, and then the threaded sleeve 120 can be installed. A first sealing element 9 is provided at the threaded connection between the threaded sleeve 120 and the magnetic tube 110. The first sealing element 9 is sleeved on the magnetic tube 110 and seals the magnetic tube 110 and the threaded sleeve 120 radially to prevent hydraulic oil in the accommodating cavity 140 from leaking from the connection between the magnetic tube 110 and the threaded sleeve 120. In this embodiment, the first sealing element 9 is an O-ring, and the limiting element 8 is an elastic retaining ring, which can be a C-ring, a spiral retaining ring, etc.

[0030] Furthermore, referring to Figure 7 The proportional flow valve also includes a coil assembly, which includes a coil 16 and a fastener 17. The coil 16 is sleeved on the outside of the magnetic tube 110. The fastener 17 is threaded to the end of the magnetic tube 110 away from the screw sleeve 120 to fix the coil 16. Under the action of the fastener 17, one end of the coil 16 abuts against the screw sleeve 120 and the other end abuts against the fastener 17.

[0031] The working principle of the proportional flow valve provided by this utility model is as follows: when coil 16 is de-energized, the proportional flow valve is in its initial state, referring to... Figure 1 The side hole 62 is misaligned and not connected to the valve seat hole 121. Hydraulic oil enters the mounting cavity from valve port A, acting on the right annular surface 71 of the compensating valve core 7, pushing the compensating valve core 7 to move to the left, opening valve port B, and hydraulic oil flows out from valve port B. When coil 16 is energized, the proportional flow valve is in working condition, referring to... Figure 2Under the action of electromagnetic force, the moving iron 2 overcomes the elastic force of the elastic element 4 and moves to the left, thereby driving the proportional valve core 6 to move to the left. As the proportional valve core 6 moves to the left, the side hole 62 and the valve seat hole 12 gradually connect. Hydraulic oil enters from valve port A, passes through the axial oil passage hole 61, the side hole 62, and the valve seat hole 121 in sequence, and flows out from valve port C. At the same time, the hydraulic pressure at valve port A will act on the right annular surface 71 of the compensating spring 15 (assuming the hydraulic pressure is F1), and the hydraulic pressure at valve port B will act on the left annular surface 72 of the compensating valve core 7 (assuming the hydraulic pressure is F2). At this time, due to the pressure difference, i.e., F1 > F2, the compensating valve core 7 will overcome the elastic force of the compensating spring 15 and move to the left to adjust the opening of valve port A and valve port B. Assuming that the elastic force of the compensating spring 15 after compression is ΔP, at this time, the following approximate equation can be formed: ΔP = F1 - F2, and the compensating valve core 7 reaches a new equilibrium. During this process, as long as the electromagnetic force remains unchanged, that is, the position of the proportional valve core 6 remains unchanged, the compensation valve core 7 can keep the pressure difference in dynamic balance. Therefore, the flow rate at valve port C remains basically stable and is not affected by the fluctuation of its downstream load.

[0032] When the threshold of the proportional flow valve needs to be adjusted, loosen the nut 11 and rotate the adjusting rod 3 to change its depth into the mounting hole 130, thereby changing the compression of the elastic element 4 and adjusting the preload, i.e., the valve threshold. After adjustment, tighten the nut 11 to lock the position of the adjusting rod 3.

[0033] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A proportional flow valve, characterized in that, include: A magnetic sleeve (1) and a moving iron (2) are provided. The magnetic sleeve (1) has a mounting hole (130) and a receiving cavity (140). The moving iron (2) is axially slidably installed in the receiving cavity (140). An adjusting rod (3) is provided, at least a portion of which is located in the mounting hole (130). An elastic element (4) is provided between the adjusting rod (3) and the moving iron (2). The adjusting rod (3) can move along the extension direction of the mounting hole (130) to adjust the preload of the elastic element (4). A valve sleeve (5) is assembled on the magnetic sleeve (1), and the valve sleeve (5) has valve port A, valve port B and valve port C. The proportional valve core (6) is connected to the moving iron (2) at one end and located inside the valve sleeve (5) at the other end, and is provided with an axial oil passage hole (61) and a side hole (62). Fluid can flow out from the valve port C through the valve port A, the axial oil passage hole (61) and the side hole (62). The compensation valve core (7) is disposed inside the valve sleeve (5), and the compensation valve core (7) can move along the axial direction of the valve sleeve (5).

2. A proportional flow valve according to claim 1, characterized in that, The cavity wall of the accommodating cavity (140) is provided with a limiting groove (1401). The proportional flow valve also includes a limiting member (8). At least a portion of the limiting member (8) is embedded in the limiting groove (1401). A portion of the limiting member (8) protrudes radially relative to the groove wall of the limiting groove (1401). Along the movement direction of the moving iron (2), one end of the moving iron (2) abuts against the limiting member (8) for limiting.

3. A proportional flow valve according to claim 2, characterized in that, The magnetic sleeve (1) includes a magnetic tube (110) and a threaded sleeve (120). One end of the threaded sleeve (120) is sleeved on the magnetic tube (110) and threadedly connected to the magnetic tube (110). A first sealing element (9) is provided at the threaded connection between the threaded sleeve (120) and the magnetic tube (110).

4. A proportional flow valve according to claim 2, characterized in that, The moving iron (2) has a connecting groove (21) at one end near the proportional valve core (6), and the proportional valve core (6) has a connector (63) that is adapted to the connecting groove (21), and the connector (63) is snapped into the connecting groove (21).

5. A proportional flow valve according to claim 4, characterized in that, The adjusting rod (3) has a limiting head (31) at one end near the moving iron (2). At least a portion of the elastic member (4) is sleeved on the limiting head (31). The moving iron (2) has a groove (22) at one end near the adjusting rod (3). At least a portion of the elastic member (4) is embedded in the groove (22). One end of the elastic member (4) abuts against the shoulder of the limiting head (31), and the other end abuts against the bottom of the groove (22).

6. A proportional flow valve according to claim 5, characterized in that, It also includes a second seal (10), the adjusting rod (3) having a circumferential mounting groove (32), at least a portion of the second seal (10) being mounted in the mounting groove (32), along the radial direction of the adjusting rod (3), one side of the second seal (10) abutting the bottom of the mounting groove (32), and the other side of the second seal (10) abutting the wall of the mounting hole (130).

7. A proportional flow valve according to claim 3, characterized in that, The proportional flow valve also includes a nut (11), which is threaded to the part of the adjusting rod (3) located outside the magnetic tube (110), and one end of the nut (11) abuts against the magnetic tube (110).

8. A proportional flow valve according to claim 6 or 7, characterized in that, It also includes a valve seat (12), which is located at one end of the valve sleeve (5) near the moving iron (2). At least a portion of the valve seat (12) passes through the compensating valve core (7). The valve seat (12) has a valve seat hole (121) communicating with the valve port C. One end of the proportional valve core (6) passes through the valve seat (12).

9. A proportional flow valve according to claim 8, characterized in that, The proportional flow valve includes an initial state in which the side hole (62) and the valve seat hole (121) are misaligned and not in communication.

10. A proportional flow valve according to claim 9, characterized in that, It also includes a spring seat (13) and a limiting sleeve (14). At least a portion of the spring seat (13) is inserted into the compensating valve core (7), and one end of the spring seat (13) abuts against the valve seat (12). A compensating spring (15) is provided between the spring seat (13) and the compensating valve core (7). One end of the compensating spring (15) abuts against the spring seat (13), and the other end abuts against the compensating valve core (7). The limiting sleeve (14) is inserted into the end of the valve sleeve (5). The compensating valve core (7) abuts against the limiting sleeve (14) under the elastic force of the compensating spring (15).

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