A balanced spool valve assembly

Abstract

The present application relates to the technical field of balance valve, and discloses a balance valve core assembly, which comprises a pressure adjusting screw, the outer arc surface of the pressure adjusting screw is threadedly connected with a screw sleeve, the inner surface of the screw sleeve is sleeved with a pressure spring, the end of the pressure spring away from the screw sleeve is in contact with a balance valve core, and the outer arc surface of the balance valve core is embedded with an isolation sleeve.The present application is provided with a spring cavity oil outlet groove, a spring cavity quick oil discharge groove and a quick oil supplement one-way valve composed of a spring cavity oil inlet one-way valve, a spring cavity oil inlet one-way valve spring, a spring positioning sheet and a clamping spring on the balance valve core, so that the oil in the spring cavity can be supplemented and discharged in a directional manner when the balance valve core moves, the oil discharge can be controlled in stages when the balance valve core is opened, the oil can be quickly supplemented through the one-way valve when the balance valve core is closed, the relative negative pressure in the spring cavity is avoided, the anti-shaking performance and the dynamic performance at the opening moment of the balance valve are effectively coordinated, the stability and the timeliness of the valve core movement are ensured, and the core performance requirements of the balance valve are met.

Description

Technical Field

[0001] This invention relates to the field of balance valve technology, specifically to a balance valve core assembly. Background Technology

[0002] The balance valve is a key pressure control component in a hydraulic control system. It is primarily used to regulate the flow direction and pressure stability of hydraulic fluid within the hydraulic circuit, preventing problems such as excessive descent and impact under gravity or external forces. It is widely used in engineering machinery, mining machinery, and hydraulic lifting equipment. Its core components typically include a valve core, spring, valve sleeve, and adjusting screw. Through the balancing effect of spring force and hydraulic pressure, it controls the on / off state and flow rate of the hydraulic fluid, thereby ensuring the smooth operation of hydraulic actuators such as hydraulic cylinders and hydraulic motors.

[0003] In existing technologies, balance valves mostly rely on the clearance between the valve core and the valve sleeve or a single oil outlet groove to discharge and replenish the oil in the spring chamber, thereby controlling the opening and closing speed of the valve core. In practical applications, balance valves are often connected in series in the return oil circuit of hydraulic actuators. When the system needs to drive the load, the control oil pushes the valve core to overcome the spring force and open, and the oil is discharged through the clearance or oil outlet groove, achieving smooth load movement. When the system stops supplying oil, the spring force pushes the valve core to reset and close, blocking the reverse flow of oil and preventing the load from falling on its own. For example, in the boom extension circuit of a crane, existing balance valves use the above structure to maintain the positional stability of the boom during the lifting and lowering process, preventing the boom from suddenly sinking.

[0004] The most critical shortcoming of existing balance valves is that they cannot simultaneously achieve both anti-vibration performance and dynamic performance at the moment of opening. To improve anti-vibration performance, existing designs often reduce the fit clearance between the valve core and the valve sleeve or use a single small-sized oil outlet groove to slow down the valve core opening speed. However, this results in a delay in the dynamic response at the moment of opening, which cannot meet the system's requirement for rapid start-up. If the clearance or the size of the oil outlet groove is increased to ensure dynamic performance at the moment of opening, it will lead to a decrease in the stability of the valve core during movement, making it prone to vibration and affecting the operating accuracy and load control stability of the hydraulic system. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a balanced valve core assembly that solves the problem of balanced valves in the prior art being unable to simultaneously achieve anti-vibration and dynamic opening performance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a balance valve core assembly, comprising a pressure adjusting screw, a threaded sleeve connected to the outer arc surface of the pressure adjusting screw, a pressure spring fitted onto the inner surface of the threaded sleeve, a balance valve core being contacted at the end of the pressure spring away from the threaded sleeve, an isolation sleeve embedded in the outer arc surface of the balance valve core, a one-way valve sleeve fitted onto the right side of the outer arc surface of the balance valve core, a one-way valve spring fixedly connected to the left side of the inner surface of the one-way valve sleeve, a gasket being contacted at the end of the one-way valve spring away from the one-way valve sleeve, a spring positioning plate fixedly connected to the left side of the inner surface of the balance valve core, a retaining ring fixedly connected to the left side of the spring positioning plate, a spring cavity inlet oil one-way valve spring being contacted to the right side of the spring positioning plate, and a spring cavity inlet oil one-way valve being contacted to the right side of the spring cavity inlet oil one-way valve spring.

[0007] Preferably, the outer arc surface of the balance valve core is provided with a spring cavity oil outlet groove along the axial direction. The spring cavity oil outlet groove penetrates the side wall of the balance valve core and is located between the one-way valve sleeve and the isolation sleeve.

[0008] Preferably, a spring cavity quick oil discharge groove is provided on the outer arc surface of the balance valve core near the isolation sleeve. The axial length of the spring cavity quick oil discharge groove is shorter than the axial length of the spring cavity oil outlet groove. The spring cavity quick oil discharge groove and the spring cavity oil outlet groove are distributed at intervals in the circumferential direction of the balance valve core.

[0009] Preferably, the isolation sleeve has an annular structure, with its inner arc surface tightly fitted to the outer arc surface of the balance valve core, its outer arc surface in contact with the inner ring of the pressure spring, and its axial ends respectively positioned opposite to the end face of the pressure spring and the end face of the one-way valve sleeve.

[0010] Preferably, the sidewall of the balance valve core is provided with a spring cavity oil inlet channel hole in the radial direction. The spring cavity oil inlet channel hole is located on the right side of the spring cavity oil inlet check valve. The spring cavity oil inlet channel hole penetrates the inner and outer arc surfaces of the balance valve core. The diameter of the spring cavity oil inlet channel hole is smaller than the outer diameter of the spring cavity oil inlet check valve.

[0011] Preferably, there is a gap between the inner arc surface of the one-way valve sleeve and the outer arc surface of the balance valve core, the left end face of the one-way valve sleeve is provided with an annular boss, the inner arc surface of the annular boss fits with the outer arc surface of the balance valve core, and the right end face of the one-way valve sleeve is a planar structure.

[0012] Preferably, the gasket is an annular thin sheet structure, the inner hole of the gasket is sleeved on the outer arc surface of the balance valve core, the left end face of the gasket contacts the right end of the one-way valve spring, and the right end face of the gasket fits against the stepped surface of the outer arc surface of the balance valve core.

[0013] Preferably, the spring positioning plate has an annular structure, the outer arc surface of the spring positioning plate is interference-fitted with the inner surface of the balance valve core, a circular groove is provided on the right end face of the spring positioning plate, the inner diameter of the circular groove is adapted to the outer diameter of the oil inlet check valve spring of the spring cavity, and the left end face of the spring positioning plate is in contact with the right end face of the snap ring.

[0014] Preferably, the retaining ring is engaged in an annular groove on the inner surface of the balance valve core, the outer diameter of the retaining ring is adapted to the inner diameter of the balance valve core, and the left end face of the retaining ring does not extend beyond the left end face of the balance valve core.

[0015] Preferably, the spring cavity oil inlet check valve has a cylindrical structure, the outer arc surface of the spring cavity oil inlet check valve is slidably connected to the inner surface of the balance valve core, the left end face of the spring cavity oil inlet check valve is in contact with the right end of the spring of the spring cavity oil inlet check valve, and the right end face of the spring cavity oil inlet check valve is provided with a hemispherical protrusion.

[0016] Working Principle: When this device is in use, the control oil acts on the one-way valve sleeve, pushing it towards the threaded sleeve until S2 reaches zero. At this point, the one-way valve sleeve stops moving due to the threaded sleeve's limitation. The balance valve then enters a state where it can output flow. The opening process of the balance valve core is divided into two stages. The first stage is in the range of 0 to S2, where the balance valve core quickly discharges oil through the spring cavity's rapid oil discharge groove, causing the valve core to move rapidly. The second stage is in the range of S2 to the maximum stroke, where the oil in the spring cavity is discharged through the spring cavity's oil outlet groove. If S3 equals S2, the oil is directly discharged through the spring cavity's oil outlet groove; if S3... When the oil level is greater than S2, the oil is first discharged through the gap between the balance valve core and the isolation sleeve, and then discharged through the oil outlet groove of the spring cavity. The discharge speed at this stage is determined by the size and shape of the oil outlet groove of the spring cavity, achieving slow opening of the valve core. If the oil outlet groove of the spring cavity is not machined, the oil is discharged through the gap between the balance valve core and the isolation sleeve. The size of the gap directly controls the opening speed. When the balance valve core moves from left to right, the volume of the spring cavity increases, and the one-way valve structure composed of the spring cavity oil inlet check valve, the spring cavity oil inlet check valve spring, the spring positioning plate, and the snap ring opens. The oil flows through the spring cavity oil inlet channel hole and the one-way valve... The valve enters the spring cavity to prevent relative negative pressure from occurring in the spring cavity. When the balance valve core moves from right to left, the one-way valve structure closes, preventing the oil in the spring cavity from being discharged through the one-way valve. The oil is discharged only through the oil outlet groove of the spring cavity or the fitting clearance. If the outer diameter of the pressure spring is small enough, the isolation sleeve can be omitted. At this time, the oil in the spring cavity is discharged through the gap between the balance valve core and the screw sleeve. The size of the gap also affects the opening speed. When the balance valve core is closed, the volume of the spring cavity decreases, and the above-mentioned one-way valve structure opens quickly. The oil quickly fills the spring cavity, pushing the balance valve core to quickly reset and complete the closing action.

[0017] This invention provides a balanced valve core assembly. It has the following beneficial effects: 1. This invention achieves directional replenishment and discharge of oil in the spring cavity when the balance valve core moves by setting an oil outlet groove and a rapid oil discharge groove in the spring cavity of the balance valve core, as well as a rapid replenishment check valve composed of a spring cavity oil inlet check valve, a spring cavity oil inlet check valve spring, a spring positioning plate, and a snap ring. When the balance valve core is open, the oil discharge can be controlled in stages, and when closed, oil is quickly replenished through the check valve, avoiding relative negative pressure in the spring cavity. This effectively coordinates the anti-vibration performance and dynamic performance at the moment of opening of the balance valve, ensuring the stability and timely response of the valve core movement, and meeting the core performance requirements of the balance valve.

[0018] 2. This invention achieves oil discharge function by relying on the fit gap between the isolation sleeve and the balance valve core, or the gap formed between the valve core and the balance valve core, without setting an oil outlet groove in the spring cavity. This improves the flexibility of structural design. This design can be adapted to pressure springs with different outer diameters. When the outer diameter of the pressure spring is small, there is no need to install the isolation sleeve or process the oil outlet groove to meet the oil discharge requirements of the spring cavity. This simplifies the assembly process while ensuring the stability of the oil discharge path and is compatible with the design and application scenarios of balance valves of different specifications.

[0019] 3. This invention expands the structural adaptability of the oil outlet groove by setting it to various shapes and forms, including triangular grooves. Different shapes of oil outlet grooves correspond to different oil discharge rates. The structure of the oil outlet groove can be adjusted according to the actual working conditions of the balance valve, realizing precise control of the slow opening time of the balance valve core in the range from S2 to the maximum stroke. It is not limited to a single groove design, reducing the structural design limitations of the balance valve in different application scenarios and improving the adaptability of the assembly to working conditions. Attached Figure Description

[0020] Figure 1 This is a front cross-sectional view of the present invention; Figure 2 This is a schematic diagram of the rapid oil discharge channel of the spring cavity in this invention; Figure 3 This is a top view sectional view of the present invention; Figure 4 This is a schematic diagram of the cross-section of the spring cavity oil outlet groove and the oil inlet check valve of the present invention. Figure 5 This is a cross-sectional schematic diagram of the spring cavity oil outlet groove and the oil inlet check valve of the present invention. Figure 6 This is a schematic diagram of the spring cavity rapid oil discharge channel and oil outlet groove on the main valve core of the present invention; Figure 7 This is a cross-sectional structural diagram of the present invention without the need for an isolation sleeve.

[0021] The components include: 1. Pressure adjusting screw; 2. Screw sleeve; 3. Pressure spring; 4. Isolation sleeve; 5. Balance valve core; 6. Check valve sleeve; 7. Check valve spring; 8. Gasket; 9. Spring cavity inlet check valve; 10. Spring cavity inlet check valve spring; 11. Spring positioning plate; 12. Snap ring; 13. Spring cavity inlet check valve; 14. Spring cavity outlet groove; 15. Spring cavity inlet channel hole; 16. Spring cavity quick drain groove. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example: Please see the appendix Figure 1This invention provides a balance valve core assembly, including a pressure adjusting screw 1. A threaded sleeve 2 is threaded onto the outer arc surface of the pressure adjusting screw 1. By rotating the pressure adjusting screw 1, the axial position of the threaded sleeve 2 can be adjusted, thereby changing the pre-compression of the pressure spring 3 to set the initial opening pressure of the balance valve. A pressure spring 3 is fitted onto the inner surface of the threaded sleeve 2, providing axial return force for the balance valve core 5. When there is no control oil, the balance valve core 5 remains closed, blocking the reverse flow of oil. The end of the pressure spring 3 away from the threaded sleeve 2 contacts the balance valve core 5. As the core moving component of the balance valve, it achieves the opening and closing of the oil passage and flow regulation through axial movement. An isolation sleeve 4 is embedded in the outer arc surface of the balance valve core 5 to isolate the spring cavity from the oil inlet, limiting the discharge path of the oil in the spring cavity and preventing oil crossflow from affecting the stability of the valve core movement. A one-way valve sleeve 6 is fitted onto the right side of the outer arc surface of the balance valve core 5. It works with the control oil to push the balance valve core 5 to move, while being limited by the threaded sleeve 2. When S2 When the size returns to zero, the movement stops, allowing the balance valve to enter a state where it can output flow. A check valve spring 7 is fixedly connected to the left side of the inner surface of the check valve sleeve 6, providing axial reset force for the check valve sleeve 6. When controlling the oil pressure relief, it pushes the check valve sleeve 6 back to its initial position. The end of the check valve spring 7 away from the check valve sleeve 6 is in contact with a gasket 8 to prevent the check valve spring 7 from directly contacting the stepped surface of the outer arc surface of the balance valve core 5, reducing wear between the spring end face and the valve core. A spring positioning piece 11 is fixedly connected to the left side of the inner surface of the balance valve core 5 to position the spring cavity inlet check valve spring 10, preventing it from radially shifting during operation. A retaining ring 12 is fixedly connected to the left side of the spring positioning piece 11 to limit the axial displacement of the spring positioning piece 11 and prevent it from coming out of the inner hole of the balance valve core 5. The right side of the spring positioning piece 11 contacts the spring cavity inlet check valve spring 10, forming the spring cavity inlet check valve 13. The spring provides normally closed spring force, allowing the check valve to open only when there is a relative negative pressure in the spring cavity. The right side of the spring 10 is in contact with the spring 13, controlling that the oil can only flow into the spring cavity in one direction, preventing the oil in the spring cavity from flowing back through it. The spring positioning plate 11 has a ring structure, and the outer arc surface of the spring positioning plate 11 is interference-fitted with the inner surface of the balance valve core 5 to ensure reliable connection between the spring positioning plate 11 and the balance valve core 5 and to avoid axial movement during operation. A circular groove is provided on the right end face of the spring positioning plate 11. The inner diameter of the circular groove is adapted to the outer diameter of the spring 10, further limiting the radial position of the spring 10. The left end face of the spring positioning plate 11 is in contact with the right end face of the retaining ring 12. Through the axial limiting action of the retaining ring 12, the spring positioning plate 11 is... Maintaining a fixed position, the retaining ring 12 engages with the annular groove on the inner surface of the balance valve core 5.The snap ring 12 allows for quick assembly and fixation, while facilitating subsequent maintenance and disassembly. The outer diameter of the snap ring 12 matches the inner diameter of the balance valve core 5, preventing radial wobble caused by gaps between the snap ring 12 and the inner hole of the balance valve core 5. The left end face of the snap ring 12 does not extend beyond the left end face of the balance valve core 5.

[0024] Please see the appendix Figure 1 and appendix Figure 7 The isolation sleeve 4 has an annular structure. The inner arc surface of the isolation sleeve 4 is tightly fitted with the outer arc surface of the balance valve core 5 to ensure the coaxiality of the isolation sleeve 4 and the balance valve core 5, preventing oil leakage from the gap between them and ensuring the isolation effect between the spring cavity and the oil inlet. The outer arc surface of the isolation sleeve 4 contacts the inner ring of the pressure spring 3, providing radial positioning for the pressure spring 3 and preventing radial offset when the pressure spring 3 is compressed or reset, ensuring that the elastic force is transmitted axially to the balance valve core 5. The two axial ends of the isolation sleeve 4 are respectively set opposite to the end face of the pressure spring 3 and the end face of the one-way valve sleeve 6, limiting the axial installation position of the isolation sleeve 4, and separating the pressure spring 3 and the one-way valve sleeve 6 to prevent direct contact and wear. A gap is left between the inner arc surface of the one-way valve sleeve 6 and the outer arc surface of the balance valve core 5 to provide axial movement space for the one-way valve sleeve 6, ensuring that it can move flexibly with changes in control oil pressure. The left end face of the one-way valve sleeve 6 is provided with an annular boss, and the inner arc surface of the annular boss is fitted with the balance valve core 5. The outer arc surface of the gasket 6 fits into the balance valve core 5, reducing the clearance between the one-way valve sleeve 6 and the balance valve core 5 and preventing control oil leakage from the clearance. The inner arc surface of the annular boss fits into the outer arc surface of the balance valve core 5. The right end face of the one-way valve sleeve 6 is a flat structure, which facilitates the fit with the seals in the hydraulic system oil circuit and ensures the sealing performance of the oil circuit. The gasket 8 is an annular thin sheet structure. The inner hole of the gasket 8 fits into the outer arc surface of the balance valve core 5, ensuring that the gasket 8 and the balance valve core 5 are coaxial and avoiding uneven force on the one-way valve spring 7 due to the misalignment of the gasket 8. The left end face of the gasket 8 contacts the right end of the one-way valve spring 7, buffering the force of the one-way valve spring 7 and preventing the spring from directly impacting the balance valve core 5. The right end face of the gasket 8 fits into the stepped surface of the outer arc surface of the balance valve core 5, limiting the axial position of the gasket 8 and preventing it from axially moving with the compression and reset of the one-way valve spring 7.

[0025] Please refer to Figure 2 and Appendix. Figure 3As shown in Figures 4 and 6, the outer arc surface of the balance valve core 5 has an axially formed spring cavity oil outlet groove 14, providing a discharge channel for the oil in the spring cavity. This accommodates the slow oil discharge requirement in the later stages of the balance valve core 5's opening. The spring cavity oil outlet groove 14 penetrates the side wall of the balance valve core 5 and is located between the one-way valve sleeve 6 and the isolation sleeve 4, defining the effective area of ​​the spring cavity oil outlet groove 14. This ensures that the oil is discharged through this groove only when the valve core is opened to the corresponding position. A spring cavity rapid oil discharge groove 16 is formed on the outer arc surface of the balance valve core 5 near the isolation sleeve 4, providing a high-flow oil discharge channel for the initial opening of the balance valve core 5. The axial length of the spring cavity rapid oil discharge groove 16 is shorter than the axial length of the spring cavity oil outlet groove 14, adapting to the balance valve core 5's... To meet the initial short-stroke, rapid oil discharge requirement, the spring cavity rapid oil discharge groove 16 and the spring cavity oil outlet groove 14 are spaced apart circumferentially on the balance valve core 5. This avoids the two grooves overlapping circumferentially, which would affect the oil discharge efficiency and the structural strength of the valve core. A spring cavity oil inlet channel hole 15 is radially formed on the side wall of the balance valve core 5 to provide a channel for oil to enter the spring cavity. The spring cavity oil inlet channel hole 15 is located to the right of the spring cavity oil inlet check valve 13, ensuring that the oil must pass through the spring cavity oil inlet check valve 13 before entering the spring cavity, achieving one-way control. The spring cavity oil inlet channel hole 15 penetrates the inner and outer arc surfaces of the balance valve core 5, allowing external oil to enter the balance valve core 5 and flow into the spring cavity. The diameter of the spring cavity oil inlet channel hole 15 is smaller than the outer diameter of the spring cavity oil inlet check valve 13 to prevent the spring cavity oil inlet check valve 13 from leaking oil through the spring cavity oil inlet channel hole 15. To ensure the structural integrity of the check valve, the spring chamber inlet check valve 13 is cylindrical. The outer arc surface of the spring chamber inlet check valve 13 is slidably connected to the inner surface of the balance valve core 5. The left end face of the spring chamber inlet check valve 13 is in contact with the right end of the spring chamber inlet check valve spring 10. The spring force of the spring chamber inlet check valve spring 10 keeps the spring chamber inlet check valve 13 in a normally closed state. The right end face of the spring chamber inlet check valve 13 is provided with a hemispherical protrusion to reduce the resistance when the oil pushes the spring chamber inlet check valve 13 to open, and improve the response speed of the check valve to the pressure change of the spring chamber.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A balance valve core assembly, comprising a pressure adjusting screw (1), characterized in that, The pressure adjusting screw (1) is threaded with a sleeve (2) on its outer arc surface. A pressure spring (3) is sleeved on the inner surface of the sleeve (2). The end of the pressure spring (3) away from the sleeve (2) contacts a balance valve core (5). An isolation sleeve (4) is embedded on the outer arc surface of the balance valve core (5). A one-way valve sleeve (6) is sleeved on the right side of the outer arc surface of the balance valve core (5). A one-way valve spring (7) is fixedly connected to the left side of the inner surface of the one-way valve sleeve (6). A gasket (8) is contacted at the end of the one-way valve spring (7) away from the one-way valve sleeve (6). A spring positioning piece (11) is fixedly connected to the left side of the inner surface of the balance valve core (5). A snap ring (12) is fixedly connected to the left side of the spring positioning piece (11). A spring cavity oil inlet one-way valve spring (10) is contacted to the right side of the spring cavity oil inlet one-way valve spring (10). A spring cavity oil inlet one-way valve (13) is contacted to the right side of the spring cavity oil inlet one-way valve spring (10). The outer arc surface of the balance valve core (5) is provided with a spring cavity oil outlet groove (14) along the axial direction. The spring cavity oil outlet groove (14) penetrates the side wall of the balance valve core (5) and is located between the one-way valve sleeve (6) and the isolation sleeve (4). The outer arc surface of the balance valve core (5) near the isolation sleeve (4) is provided with a spring cavity quick oil discharge groove (16). The axial length of the spring cavity quick oil discharge groove (16) is shorter than the axial length of the spring cavity oil outlet groove (14). The spring cavity quick oil discharge groove (16) and the spring cavity oil outlet groove (14) are distributed at intervals in the circumferential direction of the balance valve core (5). The isolation sleeve (4) is a ring structure. The inner arc surface of the isolation sleeve (4) is closely fitted with the outer arc surface of the balance valve core (5). The outer arc surface of the isolation sleeve (4) is in contact with the inner ring of the pressure spring (3). The two axial ends of the isolation sleeve (4) are respectively set opposite to the end face of the pressure spring (3) and the end face of the one-way valve sleeve (6). The side wall of the balance valve core (5) is provided with a spring cavity oil inlet channel hole (15) in the radial direction. The spring cavity oil inlet channel hole (15) is located on the right side of the spring cavity oil inlet check valve (13). The spring cavity oil inlet channel hole (15) penetrates the inner and outer arc surfaces of the balance valve core (5). The diameter of the spring cavity oil inlet channel hole (15) is smaller than the outer diameter of the spring cavity oil inlet check valve (13). The spring positioning plate (11) has an annular structure. The outer arc surface of the spring positioning plate (11) is interference-fitted with the inner surface of the balance valve core (5). A circular groove is provided on the right end face of the spring positioning plate (11). The inner diameter of the circular groove is adapted to the outer diameter of the spring cavity oil inlet check valve spring (10). The left end face of the spring positioning plate (11) is in contact with the right end face of the snap ring (12). The spring cavity oil inlet check valve (13) has a cylindrical structure. The outer arc surface of the spring cavity oil inlet check valve (13) is slidably connected to the inner surface of the balance valve core (5). The left end face of the spring cavity oil inlet check valve (13) is in contact with the right end of the spring cavity oil inlet check valve spring (10). The right end face of the spring cavity oil inlet check valve (13) is provided with a hemispherical protrusion.

2. The balance valve core assembly according to claim 1, characterized in that, There is a gap between the inner arc surface of the one-way valve sleeve (6) and the outer arc surface of the balance valve core (5). The left end face of the one-way valve sleeve (6) is provided with an annular boss. The inner arc surface of the annular boss fits against the outer arc surface of the balance valve core (5). The right end face of the one-way valve sleeve (6) is a planar structure.

3. The balance valve core assembly according to claim 1, characterized in that, The gasket (8) is an annular thin sheet structure. The inner hole of the gasket (8) is sleeved on the outer arc surface of the balance valve core (5). The left end face of the gasket (8) is in contact with the right end of the one-way valve spring (7). The right end face of the gasket (8) is in contact with the stepped surface opened on the outer arc surface of the balance valve core (5).

4. A balance valve core assembly according to claim 1, characterized in that, The snap ring (12) is snapped into the annular groove opened on the inner surface of the balance valve core (5). The outer diameter of the snap ring (12) is adapted to the inner diameter of the balance valve core (5). The left end face of the snap ring (12) does not extend beyond the left end face of the balance valve core (5).

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