A bidirectional balancing valve

Abstract

The application relates to the technical field of hydraulic control, and discloses a bidirectional balance valve, which comprises a valve body provided with a mounting cavity and a balance assembly at least partially mounted in the mounting cavity, the balance assembly comprises a balance valve core and a one-way valve core, the balance valve core penetrates through the one-way valve core, the one-way valve core and the balance valve core are matched to form a valve port, along the axial direction of the balance valve core, the one-way valve core can act relative to the balance valve core to unidirectionally open the valve port, the mounting cavity and the balance assembly are provided with at least two groups, a communication cavity is arranged in communication between the two mounting cavities, the communication cavity is provided with a sliding block and a hard sleeve, at least part of the sliding block is located in the hard sleeve, and the sliding block is matched in sliding mode with the hard sleeve to push one side of the balance valve core to move and open the valve port. The hard sleeve is arranged between the cavity wall of the communication cavity and the sliding block, and the problem that the valve body is abraded during use to affect the use performance of the bidirectional balance valve is solved.

Description

Technical Field

[0001] This application relates to the field of hydraulic control technology, and in particular to a bidirectional balance valve. Background Technology

[0002] Two-way balance valve assemblies are widely used in hydraulic systems and are key hydraulic components in heavy-duty machinery. At least two balance valves are installed within the valve body to form an oil circuit, working in conjunction with the hydraulic cylinder. When oil enters one side and the pressure exceeds the set opening pressure of the balance valve, the oil pressure is transmitted to the slider between the two balance valves. The slider opens the valve on the other side, causing the hydraulic cylinder to actuate. When neither side is receiving oil, both balance valves are closed, effectively cutting off the circuit on both sides of the cylinder and preventing the cylinder from changing position due to external forces.

[0003] In related technologies, a slider slides within a channel to open a valve on the other side. The reciprocating motion of the slider causes wear on the channel, and the gap between the slider and the inner wall of the channel gradually increases, affecting the rapid response and stability of the bidirectional balancing valve. Utility Model Content

[0004] This application provides a bidirectional balancing valve, which solves the problem that wear of the valve body during use affects the performance of the bidirectional balancing valve.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application propose a bidirectional balancing valve, comprising: a valve body having an installation cavity and a balancing assembly at least partially installed in the installation cavity; the balancing assembly includes a balancing valve core and a one-way valve core, the balancing valve core passing through the one-way valve core, the one-way valve core and the balancing valve core cooperating to form a valve port; along the axial direction of the balancing valve core, the one-way valve core is capable of moving relative to the balancing valve core to open the valve port in one direction; the installation cavity and the balancing assembly are provided with at least two sets, and a connecting cavity is provided between the two installation cavities; the connecting cavity is provided with a slider and a rigid sleeve, at least a portion of the slider is located within the rigid sleeve and slides in cooperation with the rigid sleeve to push one side of the balancing valve core to move and open the valve port.

[0007] The bidirectional balancing valve provided in this application embodiment has a hard sleeve between the valve body and the slider. Under the action of hydraulic pressure, the slider pushes the balancing valve core on one side to open the valve port. During the opening or closing of the valve port, the slider and the hard sleeve slide against each other, so the wear is mainly on the inner wall of the hard sleeve. On the one hand, the hard sleeve has higher hardness and better wear resistance; on the other hand, the hard sleeve and the valve body are set separately, which is conducive to timely replacement of the hard sleeve and reduces the impact on the performance of the bidirectional balancing valve.

[0008] Optionally, the hardness of the rigid sleeve is greater than the hardness of the valve body.

[0009] Typically, a flow channel is provided within the valve body to connect various valve components. Due to performance requirements, the valve body is preferably made of aluminum. The slider and the hard sleeve slide in contact. The hard sleeve is made of a material with a hardness greater than that of the valve body. Compared to a hard sleeve with a hardness less than or equal to that of the valve body, this design can significantly reduce wear on the hard sleeve.

[0010] Optionally, the rigid sleeve is fixed to the valve body by press fitting, and the rigid sleeve is interference-fitted with the cavity wall of the communicating cavity.

[0011] To improve the stability of the connection between the rigid sleeve and the valve body, the rigid sleeve and the valve body are fixed in the communicating cavity by press fitting. The interference fit between the two can reduce leakage caused by the installation gap between the rigid sleeve and the valve body, and prevent the rigid sleeve from moving when the slider moves, thus affecting the stability of the bidirectional balance valve.

[0012] Optionally, the rigid sleeve includes a protrusion that protrudes radially outward, the communicating cavity includes a flared portion, one side of the flared portion is connected to the wall of the mounting cavity, and at least a portion of the protrusion abuts against and limits the flared portion.

[0013] The rigid sleeve has a raised part, which can be used for positioning during the installation of the rigid sleeve. When the raised part abuts against the flared part, it can be confirmed that it is installed in the optimal position, which ensures the performance of the bidirectional balance valve on the one hand, and improves the installation efficiency on the other hand.

[0014] Optionally, the rigid sleeve is sleeve-shaped, the mounting cavity includes a bottom wall, the bottom wall is connected to the wall of the communicating cavity, and the end of the rigid sleeve is flush with the bottom wall.

[0015] When the valve is closed, the balance valve core abuts against the bottom wall of the mounting cavity. If the end of the hard sleeve protrudes from the bottom wall, the balance valve core will be pushed up by the protruding part of the hard sleeve, and a gap can easily form between the balance valve core and the one-way valve core, leading to leakage. The end of the hard sleeve is flush with the bottom wall, which also makes it less prone to cavitation and other phenomena, thus improving the stability of the bidirectional balance valve.

[0016] Optionally, the rigid sleeve includes two cylindrical units, each of which is provided with the protrusion. The two cylindrical units are sleeved on the outside of the slider, and the cylindrical units enter from opposite sides and are press-fitted into the valve body.

[0017] To enable bidirectional limiting of the rigid sleeve, protrusions are provided on both sides of the rigid sleeve. The rigid sleeve is configured as two cylindrical units, which can be inserted from both sides of the connecting cavity during installation. Compared with deforming it after installation to form protrusions, this method is more convenient and improves installation efficiency.

[0018] Optionally, the two cylindrical units abut against each other on opposite sides or the two cylindrical units have a minimum distance L, where L ≤ 0.5 mm.

[0019] Because of the machining gap between the two cylinder units, the fluid velocity increases sharply when passing through the suddenly contracting gap, causing a sudden drop in local pressure and easily leading to cavitation. By having the two cylinder units abut against each other on opposite sides or controlling the distance between them, cavitation can be effectively reduced, thereby extending the service life of the bidirectional balancing valve.

[0020] Optionally, the valve body has a C port and a V port, the V port being away from the communicating cavity relative to the C port, the valve port being located between the C port and the V port, and the one-way valve core and the balance valve core opening the valve port relative to each other to connect the C port and the V port.

[0021] The present application provides a bidirectional balancing valve that uses a hard sleeve between the valve body and the slider. When there is a pressure difference on both sides of the slider, the slider slides within the hard sleeve, thereby reducing wear on the valve body and extending the service life of the bidirectional balancing valve. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the bidirectional balancing valve provided in the embodiments of this application;

[0024] Figure 2 This is a cross-sectional schematic diagram of the valve body provided in an embodiment of this application;

[0025] Figure 3 This is a partial cross-sectional schematic diagram provided for an embodiment of this application;

[0026] Figure 4 Example 1 Figure 1 A magnified view of a portion at point A;

[0027] Figure 5 Example 2 Figure 1 A magnified view of the area at point B;

[0028] Figure 6 Example 3 Figure 1 A magnified view of a portion at point C.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1. Valve body; 1a. Mounting cavity; 1b. Bottom wall; 1c. Communicating cavity; 1d. Flared part; 2. Balancing assembly; 21. Balancing valve core; 21a. Balancing channel; 22. One-way valve core; 25. First elastic element; 26. Second elastic element; 27. Valve port; 3. Valve seat; 3a. First port; 3b. Second port; 41. Slider; 42. Hard sleeve; 421. Protrusion; 422. Cylinder unit; 51. C1 oil port; 52. C2 oil port; 53. V1 oil port; 54. V2 oil port. Detailed Implementation

[0031] 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.

[0032] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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.

[0033] In hydraulic systems, a two-way balance valve is typically used in conjunction with a hydraulic cylinder. The valve on the other side can only open and activate the cylinder when oil is supplied to one side and the pressure exceeds the valve's opening pressure setting. When neither side is supplied with oil, both balance valves are closed, effectively creating a circuit breaker on both sides of the cylinder, ensuring that the cylinder's position is not altered by external forces.

[0034] This application provides an embodiment of a bidirectional balancing valve, referring to... Figure 1 and Figure 2 In Embodiment 1, the bidirectional balancing valve includes a valve body 1 and balancing components 2. At least two sets of balancing components 2 are provided. The valve body 1 has mounting cavities 1a, the number of which corresponds to the number of balancing components 2. At least a portion of one set of balancing components 2 is installed within one mounting cavity 1a. The valve body 1 has C-ports and V-ports. Typically, C-ports are used to connect to the hydraulic cylinder, and V-ports are used to connect to various valve components. Specifically, C-ports include C1 port 51 and C2 port 52, and V-ports include V1 port 53 and V2 port 54. C1 port 51 and V1 port 53 are located on one side of the valve body 1 (corresponding to the left side in the figure), and C2 port 52 and V2 port 54 are located on the other side of the valve body 1 (corresponding to the right side in the figure).

[0035] Reference Figure 2 and Figure 3 Each balancing component 2 includes a balancing valve core 21 and a one-way valve core 22, both of which are installed in the mounting cavity 1a. The balancing valve core 21 passes through the one-way valve core 22. The balancing component 2 has a valve port 27. Along the axial direction of the balancing valve core 21, the one-way valve core 22 can cooperate with the balancing valve core 21 to open the valve port 27 in one direction. A connecting cavity 1c is provided in the valve body 1. The connecting cavity 1c extends along the axial direction of the balancing valve core 21 and connects the two mounting cavities 1a. A slider 41 is also provided in the valve body 1. At least a portion of the slider 41 is slidably installed in the connecting cavity 1c. The slider 41 can move within the connecting cavity 1c to push the balancing valve core 21 in the other mounting cavity 1a to move in the opposite direction and open the valve port 27.

[0036] Ports C1 51 and V1 53 are located on opposite sides of valve port 27. Port C1 51 is closer to the connecting cavity 1c than port V1 53. When valve port 27 is open, ports C1 51 and V1 53 are connected. The connection between ports C2 52 and V2 54 is similar. When oil enters through port V1 53, the one-way valve core 22 can be pushed open under the pressure of the oil. In another operating condition, when the oil pressure in one mounting cavity 1a is greater than the oil pressure in the other mounting cavity, the slider 41 moves towards the side with lower oil pressure under the action of hydraulic pressure, pushing the balance valve core on that side to open the valve port and release pressure.

[0037] Specifically, the bidirectional balancing valve also includes a valve seat 3, a portion of which is inserted into the mounting cavity 1a, and the valve seat 3 is fixed to the valve body 1. In this embodiment, the valve seat 3 is threadedly connected to the valve body 1, and a sealing ring is also fitted on the outside of the valve seat 3. During the installation of the valve seat 3, the valve seat 3 and the valve body 1 clamp the sealing ring to reduce external leakage.

[0038] The balancing assembly 2 also includes a first elastic element 25 and a second elastic element 26. Under the action of the second elastic element 26, the one-way valve core 22 and the balancing valve core 21 abut against each other, keeping the valve port 27 closed. The mounting cavity 1a has a bottom wall 1b on the side away from its opening. The force applied by the first elastic element 25 to the balancing valve core 21 causes the end of the balancing valve core 21 away from the first elastic element 25 to abut against the bottom wall 1b; while the force applied by the second elastic element 26 to the one-way valve core 22 causes the one-way valve core 22 to abut against the balancing valve core 21. The second elastic element 26 provides the force for the one-way valve core 22 to close the valve port 27. When the forces on both sides reach equilibrium, the valve port 27 is closed, which is the closed valve state.

[0039] Aluminum, as a commonly used material in the valve industry, possesses inherent machinability, corrosion resistance, and lightweight properties, making it particularly suitable for small to medium-sized, mass-produced hydraulic components. Therefore, valve bodies are typically made of aluminum or aluminum alloy. However, during experiments, it was found that aluminum components have poor wear resistance, and when used in valve products, the moving parts are prone to wear.

[0040] The valve seat 3 also has a first port 3a and a second port 3b, both of which are located on the side wall of the valve seat 3, allowing communication between the inner and outer sides of the valve seat 3. The first port 3a is farther away from the one-way valve core 22 than the second port 3b. The balance valve core 21 has a balance channel 21a, which is an axially penetrating channel through the balance valve core 21. In the closed state, the oil from the V1 port 53 can enter the valve seat 3 through the first port 3a and then exert a force on the slider 41 through the balance channel 21a. Normally, the flow area of ​​the first port 3a is smaller than that of the second port 3b. The oil from the V1 port 53 enters the valve seat 3 through the second port 3b. When the oil pressure reaches the opening force of the one-way valve core 22, the one-way valve core 22 is pushed open, completing the pressure relief.

[0041] In related technologies, when a pressure difference is created between the two mounting chambers, the slider moves under hydraulic pressure to open the valve port on one side. However, the reciprocating motion of the slider causes wear on the channel, and the gap between the slider and the inner wall of the channel gradually increases, affecting the rapid response and stability of the bidirectional balancing valve.

[0042] Reference Figure 3 and Figure 4 To solve this problem, a rigid sleeve 42 is provided in the connecting cavity 1c. At least a portion of the slider 41 is located in the rigid sleeve 42 and slides in cooperation with the rigid sleeve 42 to push the balance valve core 21 on one side to move and open the valve port 27.

[0043] Under the action of hydraulic pressure, the slider 41 pushes the balance valve core 21 on one side to open the valve port 27. During the process of opening or closing the valve port 27, the slider 41 slides with the hard sleeve 42. Therefore, the wear is mainly on the inner wall of the hard sleeve 42. On the one hand, the hard sleeve 42 has higher hardness and better wear resistance; on the other hand, the hard sleeve 42 and the valve body 1 are set separately, which is conducive to timely replacement of the hard sleeve 42 and reduces the impact on the performance of the bidirectional balance valve.

[0044] Furthermore, the hardness of the hard sleeve 42 is greater than that of the valve body 1, and it can be made of materials such as steel. The sliding contact between the slider 41 and the hard sleeve 42 is prone to wear. Setting the hard sleeve 42 to be made of a material with a hardness greater than that of the valve body 1 can reduce the wear of the hard sleeve 42 to a greater extent compared to setting the hardness of the hard sleeve 42 to be less than or equal to that of the valve body 1, which is beneficial to extending the service life of the bidirectional balance valve.

[0045] The rigid sleeve 42 is press-fitted to the valve body 1, and the rigid sleeve 42 is interference-fitted with the cavity wall of the connecting cavity 1c. To improve the stability of the connection between the rigid sleeve 42 and the valve body 1, the rigid sleeve 42 and the valve body 1 are fixed in the connecting cavity 1c by press-fitting. The interference fit between the two can reduce leakage caused by the installation gap between the rigid sleeve 42 and the valve body 1, and also prevent the rigid sleeve 42 from moving when the slider 41 moves, thus avoiding affecting the stability of the bidirectional balance valve.

[0046] To improve the stability of the rigid sleeve 42 during installation, the rigid sleeve 42 includes a protrusion 421 located at the end and protruding radially outward. The communicating cavity 1c includes a flared portion 1d, one side of which connects to the wall of the mounting cavity 1a. At least a portion of the protrusion 421 abuts against and limits the flared portion 1d. The rigid sleeve 42 containing the protrusion 421 is an integral structure, and the protrusion 421 is annularly shaped to completely fit the flared portion 1d.

[0047] During the installation of the rigid sleeve 42, the protrusion 421 can be used for positioning. When the protrusion 421 abuts against the flared part 1d, it can be confirmed that it is installed in the optimal position, which ensures the performance of the bidirectional balance valve on the one hand and improves the installation efficiency on the other.

[0048] To improve the bidirectional stability of the rigid sleeve 42, two sets of protrusions 421 are provided, located at both ends, and two sets of flared portions 1d are provided, for the protrusions 421 to abut and limit.

[0049] In the first embodiment, the rigid sleeve 42 is an integral sleeve. Considering that the protrusion 421 may prevent the rigid sleeve 42 from being completely installed into the communicating cavity 1c, this embodiment provides an installation method to ensure that the rigid sleeve 42 can be completely installed into the communicating cavity 1c. Before installation, the rigid sleeve 42 may have a set of protrusions 421 or may not have protrusions 421. The rigid sleeve 42 is installed into the communicating cavity 1c from the side without protrusions 421. After reaching the preferred installation position, a tightening device is used to make the rigid sleeve 42 fit against the inner wall of the communicating cavity 1c, and the tightening device is used to form the protrusions 421 to reduce wear on the inner wall. Preferably, before installation, the rigid sleeve 42 has a set of protrusions 421. During installation, the protrusions 421 abut against the flared portion 1d on one side and reach the preferred installation position, improving installation efficiency.

[0050] The bottom wall 1b connects to the wall of the connecting cavity 1c, and the end of the rigid sleeve 42 is flush with the bottom wall 1b. In the closed state, the balance valve core 21 abuts against the bottom wall 1b of the mounting cavity 1a. If the end of the rigid sleeve 42 protrudes from the bottom wall 1b, the balance valve core 21 will be pushed up by the protruding part of the rigid sleeve 42, and a gap may easily form between the balance valve core 21 and the one-way valve core 22, leading to leakage. The end of the rigid sleeve 42 is flush with the bottom wall 1b, which also makes cavitation less likely, thus improving the stability of the bidirectional balance valve.

[0051] Reference Figure 3 and Figure 5 In the second embodiment, the rigid sleeve 42 includes two cylindrical units 422, each of which is provided with a protrusion 421. The two cylindrical units 422 are sleeved on the outside of the slider 41, and the cylindrical units 422 enter from opposite sides and are press-fitted with the valve body 1.

[0052] To enable the rigid sleeve 42 to be bidirectionally limited, protrusions 421 are provided on both sides of the rigid sleeve 42. The rigid sleeve 42 is configured as two cylindrical units 422. During installation, it can be inserted from both sides of the connecting cavity 1c. Compared with deforming it after installation to form protrusions 421, this method is more convenient and improves installation efficiency.

[0053] Reference Figure 3 , Figure 5 and Figure 6 Furthermore, the two cylindrical units 422 abut against each other on opposite sides, or, in the third embodiment, the two cylindrical units 422 have a gap L, preferably L≤0.5mm.

[0054] Because of the machining gap between the cylindrical unit 422 and the cavity wall of the connecting chamber 1c, the fluid velocity increases sharply when passing through the suddenly contracting gap, causing a sudden drop in local pressure and easily leading to cavitation. Maintaining a small gap or no gap between the two cylindrical units 422 can effectively reduce cavitation and thus extend the service life of the bidirectional balancing valve.

[0055] The bidirectional balancing valve includes a first state, in which the valve port 27 formed by one set of balancing valve cores 21 and one-way valve cores 22 is in the maximum open state. At this time, at least a portion of the slider 41 is still located within the channel formed by the rigid sleeve 42. In the maximum open state, at least a portion of the slider 41 remains within the channel, effectively preventing the slider 41 from dislodging and ensuring the stability of the bidirectional balancing valve. It should be noted that the first state here refers to the situation where there is a hydraulic difference between the two mounting chambers 1a. Under the action of hydraulic pressure, the slider 41 is pushed to the side with lower hydraulic pressure until it can no longer be pushed, i.e., one of the terminal positions.

[0056] When there is a pressure difference between the two mounting cavities 1a, the slider 41 moves to the side with less pressure under pressure. The slider 41 can push the balance valve core 21 on that side to actuate, compress the first elastic element 25 to open the valve port 27, so as to achieve the effect of pressure relief.

[0057] The two-way balance valve also includes a second state. In the second state, the oil at port 53 of V1 pushes open the one-way valve core 22, and the valve port 27 opens, allowing the oil to be depressurized from port 51 of C1.

[0058] The overall working principle of this scheme is as follows: When oil enters through port V1 53, the hydraulic oil is divided into two paths. One path enters through port 3b. When the oil pressure is greater than the force exerted by the second elastic element 26 on the one-way valve core 22, the oil pushes the one-way valve core 22 to open the valve port 27, allowing the hydraulic oil entering from port V1 53 to flow into the rod chamber of the cylinder through port 27 and finally through port C1 51. The other path enters the valve seat 3 from port 3a and then enters the balance channel 21a. When the oil pressure reaches the set pressure, it pushes the slider 41 to move, thereby pushing the balance valve core 21 in another mounting cavity 1a to move. The valve port on this side is then opened, allowing the hydraulic oil in the rodless cavity of the cylinder to enter the mounting cavity 1a on this side through port C2 52 and finally flow out from port V2 54 through the valve port on this side. Conversely, when oil enters through port V2 54, one stream of hydraulic oil flows into the rodless chamber of the cylinder through the right valve port, while the other stream pushes the slider 41 to the left, opening the left valve port 27. This allows the oil in the rod chamber of the cylinder to flow out from port C1 51 through valve port 27 and out through port V1 53. This reciprocating cycle allows the cylinder piston rod to move left and right or up and down to perform the desired action. When the oil flow is simultaneously cut off at ports V1 53 and V2 54, the cylinder can be locked, keeping the load in a stable state.

[0059] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The above descriptions are merely embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

[0061] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A bidirectional balancing valve, characterized in that, include: A valve body (1) with an installation cavity (1a) and a balancing assembly (2) at least partially installed in the installation cavity (1a). The balancing assembly (2) includes a balancing valve core (21) and a one-way valve core (22). The balancing valve core (21) passes through the one-way valve core (22). The one-way valve core (22) and the balancing valve core (21) cooperate to form a valve port (27). Along the axial direction of the balancing valve core (21), the one-way valve core (22) can move relative to the balancing valve core (21) to open the valve port (27) in one direction. The mounting cavity (1a) and the balancing assembly (2) are provided with at least two sets of connections. A connecting cavity (1c) is provided between the two mounting cavities (1a). The connecting cavity (1c) is provided with a slider (41) and a rigid sleeve (42). At least a portion of the slider (41) is located inside the rigid sleeve (42) and slides in cooperation with the rigid sleeve (42) to push the balancing valve core (21) on one side to move and open the valve port (27).

2. The bidirectional balancing valve according to claim 1, characterized in that, The hardness of the hard sleeve (42) is greater than that of the valve body (1).

3. The bidirectional balancing valve according to claim 2, characterized in that, The rigid sleeve (42) is fixed to the valve body (1) by press fitting, and the rigid sleeve (42) is interference-fitted with the cavity wall of the communicating cavity (1c).

4. The bidirectional balancing valve according to claim 3, characterized in that, The rigid sleeve (42) includes a protrusion (421) that protrudes radially outward, the communicating cavity (1c) includes a flared portion (1d), one side of the flared portion (1d) is connected to the wall of the mounting cavity (1a), and at least a portion of the protrusion (421) abuts against and limits the flared portion (1d).

5. The bidirectional balancing valve according to claim 3 or 4, characterized in that, The rigid sleeve (42) is sleeve-shaped, the mounting cavity (1a) includes a bottom wall (1b), the bottom wall (1b) is connected to the wall of the communicating cavity (1c), and the end of the rigid sleeve (42) is flush with the bottom wall (1b).

6. The bidirectional balancing valve according to claim 4, characterized in that, The rigid sleeve (42) includes two cylindrical units (422), each of which is provided with the protrusion (421). The two cylindrical units (422) are sleeved on the outside of the slider (41), and the cylindrical units (422) enter from opposite sides and press-fit with the valve body (1).

7. The bidirectional balancing valve according to claim 6, characterized in that, The two cylindrical units (422) abut against each other on opposite sides or the two cylindrical units (422) have a gap L, where L ≤ 0.5 mm.

8. The bidirectional balancing valve according to claim 3 or 4, characterized in that, Including the first state, in which the valve port (27) formed by one of the balance valve cores (21) and the one-way valve cores (22) is in the maximum open state, at least a portion of the slider (41) is still located in the channel formed by the rigid sleeve (42).

9. The bidirectional balancing valve according to claim 8, characterized in that, The valve body (1) has a C port and a V port. The V port is far away from the communicating cavity (1c) relative to the C port. The valve port (27) is located between the C port and the V port. The one-way valve core (22) and the balance valve core (21) move relative to each other to open the valve port (27) so that the C port and the V port are connected.

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