A balancing valve

Abstract

The application relates to the technical field of valve bodies, and discloses a balance valve which comprises a valve body, a valve core, a valve sleeve and a valve seat, the valve core, the valve sleeve and the valve seat are respectively installed in a valve body cavity of the valve body, and the valve seat is formed with a valve seat oil hole; the valve core is provided with a valve core cavity and a communication hole which are communicated with each other and arranged along a first direction, and the communication hole is located at an end of the valve core which faces the valve seat; the projection area of the valve core cavity along the first direction is the same as the projection area of the valve seat oil hole along the first direction; wherein the balance valve comprises an opening state for communication between the valve seat oil hole and a valve body oil hole and a closing state for disconnection between the valve seat oil hole and the valve body oil hole; when the balance valve is in the closing state, the oil pressure in the valve core cavity is the same as the oil pressure in the valve body oil hole, so that the acting force acting on the valve core is in a balanced state, the valve core of the balance valve is not affected by the oil pressure in the valve seat oil hole, the opening of the balance valve is not affected by the load pressure, and the use stability of the balance valve is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve body technology, specifically to a balancing valve. Background Technology

[0002] The hydraulic balance valve is an important component in the hydraulic system, mainly used to control the movement speed and position stability of the hydraulic cylinder.

[0003] The balancing valves on the market have an overflow function, that is, when the maximum load reaches the opening pressure set by the balancing valve, the balancing valve opens to overflow, and the oil at the load will move automatically. This overflow function is affected by the complex pressure of the load, which can easily lead to a decrease in the control stability of the balancing valve and make it unable to meet some working conditions that have high requirements for the stability of the balancing valve. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this application is to provide a balancing valve that allows the opening of the balancing valve to be unaffected by load pressure, thereby improving the stability of the balancing valve in use.

[0005] A balancing valve includes a valve body, a valve core, a valve sleeve, and a valve seat. The valve body has a valve body oil hole and a valve body cavity extending along a first direction, the valve body oil hole communicating with the valve body cavity. The valve core is installed in the valve body cavity and has a degree of freedom of movement along the first direction. The valve sleeve is located at one end of the valve body along the first direction and is at least partially installed in the valve body cavity. The valve seat is located at the other end of the valve body along the first direction, the valve seat is installed in the valve body cavity, and the valve seat has a degree of freedom of movement along the first direction. The valve seat has a valve seat oil hole. The valve core has interconnected valve core cavities and connecting holes arranged along a first direction, with the connecting holes located at the end of the valve core facing the valve seat; the projected area of ​​the valve core cavity along the first direction is the same as the projected area of ​​the valve seat oil hole along the first direction; wherein, the balancing valve includes an open state for connecting the valve seat oil hole and the valve body oil hole and a closed state for disconnecting the valve seat oil hole and the valve body oil hole; when the balancing valve is in the closed state, the oil pressure in the valve core cavity is the same as the oil pressure in the valve body oil hole, so that the balancing valve remains in the closed state.

[0006] Furthermore, the valve core has an adjusting groove extending along a first direction, and a connecting hole communicates with the adjusting groove; the balance valve includes an adjusting rod that extends at least partially into the adjusting groove, such that the adjusting rod and the adjusting groove together form a valve core cavity.

[0007] Furthermore, the balance valve includes a first sealing ring, which is installed on the side wall of the adjusting rod and abuts against the adjusting groove to form a sealed valve core cavity within the valve core.

[0008] Furthermore, the balancing valve also includes a valve core spring for providing force to the valve core, the valve core spring being connected to an adjusting rod; the adjusting rod has an adjusting degree of freedom to adjust relative to the valve core along a first direction, so as to change the force exerted by the valve core spring on the valve core.

[0009] Furthermore, the adjusting rod extends at least partially outside the valve sleeve, and the adjusting rod is connected to the valve sleeve by threads, so that the adjusting rod has a degree of freedom to adjust relative to the valve core in a first direction.

[0010] Furthermore, a limit ring is formed on the side wall of the adjusting rod, and the two ends of the valve core spring abut against the limit ring and the valve core, respectively.

[0011] Furthermore, the valve sleeve and valve body together form a first cavity, the first cavity is located at the end of the valve core facing the valve sleeve, and the valve core extends at least partially into the first cavity; the valve body has a back pressure hole, which communicates with the first cavity.

[0012] Furthermore, the balancing valve also includes a pressure relief component installed in the back pressure port, the pressure relief component having a disconnected state with the back pressure port open and a connected state with the back pressure port closed.

[0013] Furthermore, the valve body has a mounting ring groove, which is at least partially connected to the back pressure hole, and the pressure relief component is installed in the mounting ring groove.

[0014] Furthermore, the valve body and valve seat together form a second cavity, which is located at the end of the valve core facing the valve seat, and the valve core extends at least partially into the second cavity; the oil hole in the valve body and the oil hole in the valve seat are respectively connected to the second cavity.

[0015] Furthermore, the valve core and valve body together form a third cavity, which is located in the middle of the valve core along the first direction; the valve body has a pilot hole, which communicates with the third cavity.

[0016] By ensuring that the area of ​​the oil acting on the valve core cavity is the same as the area of ​​the oil hole in the valve seat, the force acting on the valve core is in a balanced state. This makes the valve core of the balancing valve unaffected by the oil pressure in the oil hole in the valve seat, and the opening of the balancing valve is unaffected by the load pressure, thus improving the stability of the balancing valve in use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the balancing valve provided in this application.

[0018] Figure 2 yes Figure 1 The diagram shows a half-section of the balancing valve.

[0019] Figure 3 yes Figure 1 The cross-sectional view of the valve body of the balancing valve shown.

[0020] Figure 4 yes Figure 1 The valve core shown is a cross-sectional view.

[0021] Reference numerals: Valve body 1, Valve body cavity 1-1, Valve body oil hole 1-2, Back pressure hole 1-4, Mounting ring groove 1-5, Pilot hole 1-6, First valve body section 1-7, Second valve body section 1-8, Third valve body section 1-9, Fourth valve body section 1-10, Fifth valve body section 1-11, Valve core 2, Valve core cavity 2-1, Connecting hole 2-2, Adjusting groove 2-3, Groove 2-4, Valve sleeve 3, Valve seat 4, Valve seat oil hole 4-1, Adjusting rod 5, Limiting ring 5-1, First sealing ring 6, Valve core spring 7, First cavity 8, Pressure relief component 9, Second cavity 10, Third cavity 11, Locking nut 12, Mounting end cap 13, Valve seat spring 14. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0023] like Figure 1 and Figure 2 As shown, as one implementation, a balancing valve includes a valve body 1, a valve core 2, a valve sleeve 3, and a valve seat 4. The valve body 1 has a valve body oil hole 1-2 and a valve body cavity 1-1 extending along a first direction. The valve body oil hole 1-2 communicates with the valve body cavity 1-1, allowing oil to flow into or out of the valve body cavity 1-1 through the valve body oil hole 1-2. The valve sleeve 3 is located at one end of the valve body 1 along the first direction and is connected to the valve body cavity 1-1 by threads, making the valve sleeve 3 and the valve body cavity 1-1 relatively fixed. The valve seat 4 is located at the other end of the valve body 1 along the first direction and is installed in the valve body cavity 1-1. The valve seat 4 has a degree of freedom of movement in the first direction, allowing it to slide within the valve body cavity 1-1. The valve core 2 is installed in the valve body cavity 1-1 between the valve sleeve 3 and the valve seat 4, and the valve core 2 also has a degree of freedom of movement in the first direction, allowing it to slide within the valve body cavity 1-1.

[0024] To more clearly describe the technical solution of this application, the following are defined: Figure 1 The left and right directions mentioned above. Wherein, the first direction refers to... Figure 1 The left and right directions in the middle.

[0025] like Figure 2 and Figure 3As shown, in one implementation, the valve body cavity 1-1 includes, from left to right, a first valve body section 1-7, a second valve body section 1-8, a third valve body section 1-9, a fourth valve body section 1-10, and a fifth valve body section 1-11 along the first direction. The valve core 2 is sealed and slidably connected to the second valve body section 1-8 and the third valve body section 1-9, respectively. The shoulder formed at the connection between the second valve body section 1-8 and the third valve body section 1-9 limits the amount of movement of the valve core 2 toward the valve seat 4.

[0026] Furthermore, the valve sleeve 3 is fixedly installed in the valve body section 1-7, the valve seat 4 is installed in the fifth valve body section 1-11, and the valve seat 4 can move in the first direction within the fifth valve body section 1-11.

[0027] It should be noted that when the valve core 2 abuts against the shoulder at the connection between the second valve body section 1-8 and the third valve body section 1-9, the end of the valve core 2 abuts against the valve seat 4, ensuring that the balance valve is in the closed state under normal conditions.

[0028] In one implementation, the valve sleeve 3 and the first valve body section 1-7 of the valve body 1 together form a first cavity 8. The first cavity 8 is located at the end of the valve core 2 facing the valve sleeve 3, and the valve core 2 extends at least partially into the first cavity 8. When the balance valve is opened, the valve core 2 moves toward the first cavity 8.

[0029] In one implementation, the fourth valve body segment 1-10 of the valve body 1 and the valve seat 4 together form a second cavity 10. The second cavity 10 is located at the end of the valve core 2 facing the valve seat 4, and the valve core 2 extends at least partially into the second cavity 10.

[0030] The valve seat 4 has a valve seat oil hole 4-1, which is connected to an external load.

[0031] The valve body oil hole 1-2 and the valve seat oil hole 4-1 are respectively connected to the second chamber 10, so that the oil can flow out from the valve body oil hole 1-2 through the second chamber 10 and out from the valve seat oil hole 4-1, or from the valve seat oil hole 4-1 through the second chamber 10 and out from the valve body oil hole 1-2.

[0032] In one implementation, the valve core 2 and the valve body 1 together form a third cavity 11. The third cavity 11 is located in the middle of the valve core 2 along the first direction. Two valve core sealing rings are installed on the outer side of the valve core 2. The two valve core sealing rings are located on both sides of the third cavity 11 to ensure the sealing of the third cavity 11.

[0033] Specifically, a groove 2-4 is formed on the side wall of the valve core 2. The groove 2-4 is located near the connection between the second valve body section 1-8 and the third valve body section 1-9, so that the connection between the valve core 2 and the second valve body section 1-8 and the third valve body section 1-9 forms a third cavity 11.

[0034] A pilot hole 1-6 is formed in the valve body 1. The pilot hole 1-6 is connected to the third chamber 11 and the pilot hole 1-6 is connected to the control oil circuit. The valve core 2 is moved by the oil in the control oil circuit.

[0035] The balance valve includes open, closed, and return states.

[0036] When the balance valve is in the open state, the control oil flows into the third chamber 11 through the pilot hole 1-6, causing the valve core 2 to move toward the valve sleeve 3, thus separating the valve core 2 from the valve seat 4. The oil flows out from the valve body oil hole 1-2 through the valve seat oil hole 4-1 and the second chamber 10. In this state, the valve seat 4 does not move (the end face of the valve seat 4 facing the valve core 2 abuts against the shoulder at the connection of the fourth valve body section 1-10 and the fifth valve body section 1-11).

[0037] When the balance valve is closed, the shoulder of the valve core 2 abuts against the connection between the second valve body section 1-8 and the third valve body section 1-9, and the end face of the valve core 2 facing the valve seat 4 abuts against the oil hole 4-1 of the valve seat, so that the oil cannot flow through the balance valve.

[0038] When the balance valve is in the return oil state, the oil flows into the second chamber 10 through the valve body oil hole 1-2. The oil pressure in the second chamber 10 increases until it can drive the valve seat 4 to move, so that the valve seat 4 moves away from the valve core 2, causing the valve core 2 to separate from the valve seat 4. The oil flows out from the valve seat oil hole 4-1 through the second chamber 10 from the valve body oil hole 1-2. In this state, the valve core 2 does not move (the valve core 2 abuts against the shoulder at the connection of the second valve body section 1-8 and the third valve body section 1-9).

[0039] It should be noted that when the balance valve is in the closed state, the shoulder of the valve core 2 abuts against the connection between the second valve body section 1-8 and the third valve body section 1-9. Figure 1 The position of the third chamber 11 is shown in the image; the shoulder of the valve core 2 is not fitted against the connection between the second valve body section 1-8 and the third valve body section 1-9. (For example...) Figure 2 and Figure 4 As shown, in one implementation, the valve core 2 has a valve core cavity 2-1 and a connecting hole 2-2. The valve core cavity 2-1 and the connecting hole 2-2 are arranged along the first direction and are interconnected. The connecting hole 2-2 is located at the end of the valve core 2 facing the valve seat 4. The projected area of ​​the valve core cavity 2-1 along the first direction is the same as the projected area of ​​the valve seat oil hole 4-1 along the first direction.

[0040] When the balance valve is in the open state, the end face of the valve core 2 facing the valve seat 4 is separated from the valve seat 4, so that the valve seat oil hole 4-1 and the valve body oil hole 1-2 are connected, and the oil can pass through the balance valve; when the balance valve is in the closed state, the end face of the valve core 2 facing the valve seat 4 abuts against the valve seat oil hole 4-1, so that the valve seat oil hole 4-1 and the valve body oil hole 1-2 are disconnected, and the oil cannot pass through the balance valve.

[0041] Furthermore, when the balance valve is in the open state, the oil flows into the valve core cavity 2-1 through the connecting hole 2-2. Since the projected area of ​​the valve core cavity 2-1 along the first direction is the same as the projected area of ​​the valve seat oil hole 4-1 along the first direction, the force exerted by the oil flowing into the valve core cavity 2-1 on the valve core 2 towards the valve seat is the same as the force exerted by the oil in the valve seat oil hole 4-1 on the valve core 2 towards the valve sleeve 3. This keeps the balance valve in the closed state, thereby ensuring that the valve core 2 of the balance valve is not affected by the oil pressure (load pressure) in the valve seat oil hole 4-1, thus improving the stability of the balance valve.

[0042] like Figure 4 As shown, in one implementation, the valve core 2 has an adjusting groove 2-3 extending along a first direction, a connecting hole 2-2 located at the end of the valve core 2 facing the valve seat 4, and the adjusting groove 2-3 located at the end of the valve core 2 facing the valve sleeve. The connecting hole 2-2 communicates with the adjusting groove 2-3 so that oil can flow into the adjusting groove 2-3 through the connecting hole 2-2.

[0043] Furthermore, the balance valve also includes an adjusting rod 5, which at least partially extends into the adjusting groove 2-3, so that the adjusting rod 5 and the adjusting groove 2-3 together form the valve core cavity 2-1.

[0044] When the balance valve is closed, the volume of the valve core cavity 2-1 is at its maximum. At the same time, since the projected area of ​​the valve core cavity 2-1 along the first direction is the same as the projected area of ​​the valve seat oil hole 4-1 along the first direction, the valve core 2 cannot move relative to the valve body 1.

[0045] It should be noted that the adjusting groove 2-3 can be a stepped hole or a cylindrical hole, but it is necessary to ensure that the length of the part where the adjusting groove 2-3 and the adjusting rod 5 mate is greater than or equal to the travel of the valve core 2, so as to prevent interference between the valve core 2 and the adjusting rod 5 during the movement.

[0046] like Figure 2 As shown, in one implementation, the balance valve includes a first sealing ring 6, which is installed on the side wall of the adjusting rod 5 and abuts against the adjusting groove 2-3, thereby ensuring the sealing of the valve core cavity 2-1 while the valve core 2 can move relative to the adjusting rod 5.

[0047] As one implementation, the balance valve also includes a valve core spring 7, which is connected to the adjusting rod 5. The valve core spring 7 is used to provide a force on the valve core 2 toward the valve seat 4, so that under normal conditions, the valve core 2 abuts against the oil hole 4-1 of the valve seat.

[0048] The adjusting rod 5 has the degree of freedom to adjust relative to the valve core 2 in the first direction. By changing the position of the adjusting rod 5, the compression of the valve core spring 7 is changed, thereby changing the force exerted by the valve core spring 7 on the valve core 2.

[0049] The oil in the pilot holes 1-6 is used to drive the valve core 2 to move relative to the valve body 1. By changing the force exerted by the valve core spring 7 on the valve core 2, the oil pressure used to drive the valve core 2 to move can be changed in order to meet the different driving requirements of the balance valve.

[0050] Specifically, to facilitate adjustment of the adjusting rod 5, the adjusting rod 5 extends at least partially to the outside of the valve sleeve 3, and the adjusting rod 5 is threadedly connected to the valve body 3, so that the adjusting rod has the degree of freedom to adjust relative to the valve core in the first direction.

[0051] By rotating the adjusting rod 5, the adjusting rod 5 can be moved toward or away from the valve core 2, and the adjusting rod 5 extends at least partially out of the valve sleeve 3, further improving the adjustment convenience of the adjusting rod 5.

[0052] In one implementation, a locking nut 12 is installed at the end of the adjusting rod 5 that extends out of the valve sleeve 3. When the adjusting rod 5 is adjusted to the desired position, the locking nut 12 is rotated to abut against the cross-section of the valve sleeve 3, thereby locking the adjusting rod 5.

[0053] As one implementation method, a limiting ring 5-1 is formed on the circumferential side wall of the adjusting rod 5, and the two ends of the valve core spring 7 abut against the limiting ring 5-1 and the valve core 2 respectively, which facilitates the connection between the valve core spring 7 and the adjusting rod 5 and improves the installation convenience of the valve core spring 7.

[0054] like Figure 2 and Figure 3 As shown, in one implementation, the valve body 1 has a back pressure hole 1-4, which is connected to the first cavity 8.

[0055] When the valve core 2 moves relative to the valve body 1, the oil pressure or air pressure in the first chamber 8 will change. The back pressure holes 1-4 are set to facilitate the depressurization or pressure maintenance of the first chamber 8, ensuring that the valve core 2 can move stably relative to the valve body 1.

[0056] As one implementation method, the balancing valve also includes a pressure relief component 9, which is installed in the back pressure port 1-4. The pressure relief component 9 has two usage states: a disconnected state and a connected state. In the disconnected state, the back pressure port 1-4 is open; in the connected state, the pressure relief component 9 blocks the end of the back pressure port 1-4.

[0057] When the air pressure in the first chamber 8 increases or decreases, the pressure relief component 9 separates from the back pressure hole 1-4, and the back pressure hole 1-4 opens, allowing the first chamber 8 to communicate with the atmosphere, thereby preventing the air pressure in the first chamber 8 from affecting the movement of the valve core 2.

[0058] When the air pressure in the first chamber 8 remains constant, the pressure relief component 9 is connected to the back pressure hole 1-4, closing the back pressure hole 1-4 to prevent debris from entering the first chamber 8 through the back pressure hole 1-4.

[0059] In one implementation, the valve body 1 has a mounting annular groove 1-5, which is at least partially connected to the back pressure hole 1-4. The pressure relief component 9 is installed in the mounting annular groove 1-5 so that the pressure relief component 9 can be connected to the back pressure hole 1-4.

[0060] Specifically, the pressure relief component 9 is a sealing ring structure. The installation ring groove 1-5 facilitates the stable installation of the pressure relief component 9 on the outside of the valve body 1.

[0061] Furthermore, the cross-sectional diameter of the pressure relief component 9 is greater than or equal to the diameter of the back pressure hole 1-4, so that when the pressure relief component 9 is in the connected state, the pressure relief component 9 can completely block the back pressure hole 1-4 to prevent foreign objects from entering the first cavity 8.

[0062] It should be noted that when the air pressure in the first chamber 8 decreases, air can enter the first chamber 8 through the gap between the back pressure hole 1-4 and the pressure relief component 9 or the threaded gap between the adjusting rod 5 and the valve sleeve 3.

[0063] like Figure 2 As shown, in one implementation, the balance valve also includes a mounting end cover 13 and a valve seat spring 14. The mounting end cover 1-3 is installed on the end of the fifth valve body section 1-11 away from the fourth valve body section 1-10. The valve seat 4 is located on the side of the fifth valve body section 1-11 facing the fourth valve body section 1-10. The valve seat spring 14 abuts against the valve seat 4 and the mounting end cover 13 respectively.

[0064] When the pressure of the oil in the first chamber 8 on the valve seat 4 is greater than the force of the valve seat spring 14 on the valve seat 4, the valve seat 4 moves toward the mounting end cover 13, causing the valve seat oil hole 4-1 to separate from the valve core 2, so that the oil flows out from the valve seat oil hole 4-1 through the valve body oil hole 1-2 and the second chamber 10.

[0065] It should be noted that, under normal conditions, the elastic force generated by the valve seat spring 14 is less than that generated by the valve core spring 7, so that the balance valve is normally in the closed state, the valve core 2 abuts against the valve seat 4, and the shoulder of the valve core 2 abuts against the connection between the second valve body section 1-8 and the third valve body section 1-9.

[0066] Finally, it should be noted that the above are only some preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A balancing valve, comprising: A valve body (1) is formed with a valve body oil hole (1-2) and a valve body cavity (1-1) extending in a first direction, wherein the valve body oil hole (1-2) is connected to the valve body cavity (1-1); Valve core (2), the valve core (2) is installed in the valve body cavity (1-1), and the valve core (2) has a degree of freedom of movement along a first direction; Valve sleeve (3), the valve sleeve (3) is located at one end of the valve body (1) along the first direction, and is at least partially installed in the valve body cavity (1-1); Valve seat (4), the valve seat (4) is located at the other end of the valve body (1) along the first direction, the valve seat (4) is installed in the valve body cavity (1-1), and the valve seat (4) has a degree of freedom of movement along the first direction, and the valve seat (4) has a valve seat oil hole (4-1). Its features are, The valve core (2) has valve core cavities (2-1) and connecting holes (2-2) that are interconnected and arranged along a first direction. The connecting holes (2-2) are located at the end of the valve core (2) facing the valve seat (4). The projected area of ​​the valve core cavity (2-1) along the first direction is the same as the projected area of ​​the valve seat oil hole (4-1) along the first direction. The balance valve includes an open state for communicating between the valve seat oil hole (4-1) and the valve body oil hole (1-2) and a closed state for disconnecting the valve seat oil hole (4-1) and the valve body oil hole (1-2). When the balance valve is in the closed state, the valve core cavity (2-1) is in a sealed state, and the volume of the valve core cavity (2-1) remains unchanged. The oil pressure in the valve core cavity (2-1) is the same as the oil pressure in the valve body oil hole (1-2), so that the balance valve remains in the closed state.

2. A balancing valve according to claim 1, characterized in that, The valve core (2) has an adjustment groove (2-3) extending in a first direction, and the connecting hole (2-2) communicates with the adjustment groove (2-3); The balance valve includes an adjusting rod (5), which at least partially extends into the adjusting groove (2-3) so that the adjusting rod (5) and the adjusting groove (2-3) together form a valve core cavity (2-1).

3. A balancing valve according to claim 2, characterized in that, The balance valve also includes a valve core spring (7) for providing force to the valve core (2), and the valve core spring (7) is connected to the adjusting rod (5); The adjusting rod (5) has an adjustment degree of freedom to adjust relative to the valve core (2) along the first direction, so as to change the force exerted by the valve core spring (7) on the valve core (2).

4. A balancing valve according to claim 2 or 3, characterized in that, The adjusting rod (5) extends at least partially outside the valve sleeve (3), and the adjusting rod (5) is connected to the valve sleeve (3) by a thread, so that the adjusting rod (5) has an adjustment freedom relative to the valve core (2) along the first direction.

5. A balancing valve according to claim 3, characterized in that, A limiting ring (5-1) is formed on the side wall of the adjusting rod (5), and the two ends of the valve core spring (7) abut against the limiting ring (5-1) and the valve core (2) respectively.

6. A balancing valve according to claim 1, characterized in that, The valve sleeve (3) and the valve body (1) together form a first cavity (8), the first cavity (8) is located at the end of the valve core (2) facing the valve sleeve (3), and the valve core (2) extends at least partially into the first cavity (8); The valve body (1) has a back pressure hole (1-4) which is connected to the first cavity (8).

7. A balancing valve according to claim 6, characterized in that, The balancing valve also includes a pressure relief component (9) installed in the back pressure port (1-4), the pressure relief component (9) having a disconnected state with the back pressure port (1-4) open and a connected state with the back pressure port (1-4) closed.

8. A balancing valve according to claim 7, characterized in that, The valve body (1) has an mounting annular groove (1-5), which is at least partially connected to the back pressure hole (1-4), and the pressure relief component (9) is installed in the mounting annular groove (1-5).

9. A balancing valve according to claim 1, characterized in that, The valve body (1) and the valve seat (4) together form a second cavity (10), the second cavity (10) is located at the end of the valve core (2) facing the valve seat (4), and the valve core (2) extends at least partially into the second cavity (10); The valve body oil hole (1-2) and the valve seat oil hole (4-1) are respectively connected to the second cavity (10).

10. A balancing valve according to claim 1, characterized in that, The valve core (2) and the valve body (1) together form a third cavity (11), and the third cavity (11) is located in the middle of the valve core (2) along the first direction; The valve body (1) has a pilot hole (1-6) which is connected to the third cavity (11).

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