Balance valve

Abstract

The utility model relates to the technical field of hydraulic valves, in particular to a balance valve which comprises a valve sleeve, a one-way valve and a valve element, and a first oil port and a second oil port which are formed in the radial direction are sequentially formed in the valve sleeve from the inserting end. The one-way valve is arranged in the valve sleeve and located between the second oil port and the first oil port. The valve element is arranged in the valve sleeve in a sliding mode. In the initial state, one end of the valve element abuts against the valve body of the one-way valve in a sealed mode. When entering from the second oil port, a medium acts on the valve body of the one-way valve so that the valve body can move away from the valve element. When entering from the first oil port, a medium acts on one end of the valve element so that the valve element can move away from the valve body. According to the balance valve, the first oil port is formed in the plug-in mounting end in the radial direction, so that impact of high pressure and large flow can be reduced, the large-flow balance valve is formed, and in addition, the balance valve has the advantages of being high in response, stability and integration degree, low in flow resistance and the like.

Description

Technical Field

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

[0002] As a core component for load control in fields such as engineering machinery and lifting equipment, the hydraulic balance valve's structure directly affects the system's flow carrying capacity and dynamic response characteristics. The hydraulic balance valve plays a crucial role in controlling the large flow load of the actuator.

[0003] In existing technologies, high-flow hydraulic systems (flow range ≥250L / min) generally use plate-type balance valves, which are fixed to the oil cylinder with bolts, requiring a large installation space. To meet the requirements of high flow rate and stability, plate-type balance valves are large in size and have complex flow distribution channels, resulting in high costs. Plate-type balance valves have large pressure losses, leading to increased temperature rise and faster aging of seals. The main valve core of the plate-type balance valve is driven by a pilot piston, resulting in a long dynamic response time under sudden flow changes, leading to a higher instantaneous overshoot pressure peak.

[0004] In the prior art, a utility model patent with application number "202321279768.8" and title "A Threaded High-Pressure Cartridge Balance Valve" discloses a cartridge balance valve. This balance valve still has certain problems: 1. The balance valve includes a through hole located on the axial end face. Oil enters through the through hole during operation. When high pressure and large flow enter, a large pressure shock will be generated, affecting the stability of the system; 2. The balance valve has a threaded groove on its outer periphery and is installed by threaded connection, which has low stability and safety. Utility Model Content

[0005] This invention addresses the technical problem in existing balance valves where high pressure and high flow rates cause significant pressure shocks, leading to low system stability. It proposes a balance valve that reduces the impact of high pressure and high flow rates by radially opening a first oil port at the cartridge end, thus creating a high-flow-rate balance valve and improving system stability.

[0006] The technical solution of this utility model:

[0007] A balancing valve, comprising:

[0008] A valve sleeve, wherein a first oil port and a second oil port are formed radially from the insertion end;

[0009] A one-way valve is disposed within the valve sleeve and located between the second oil port and the first oil port;

[0010] A valve core, which is slidably disposed within the valve sleeve;

[0011] In the initial state, one end of the valve core is in sealed contact with the valve body of the one-way valve; when the medium enters from the second oil port, it acts on the valve body of the one-way valve to make the valve body move away from the valve core; when the medium enters from the first oil port, it acts on one end of the valve core to make the valve core move away from the valve body.

[0012] Furthermore, the first oil port includes a plurality of circumferentially distributed first oil holes; the second oil port includes a plurality of circumferentially distributed second oil holes.

[0013] Furthermore, the one-way valve includes a valve body, a first spring, and a first spring seat. The first spring seat is fixedly installed on the side near the first oil port, the valve body is slidably disposed on the side near the second oil port, and the first spring is compressed and disposed between the first spring seat and the valve body.

[0014] The center of the valve body is connected to the first oil port, and a first oil cavity is formed between the first spring seat, the inner wall of the valve sleeve and the valve body. A first oil drain port is formed on the enclosing wall of the valve body or the first spring seat, which connects the first oil cavity and the first oil port.

[0015] Furthermore, the valve sleeve is also radially provided with a third oil port, which is located on the side of the second oil port away from the first oil port;

[0016] The other end of the valve core is provided with a second spring and a second spring seat. The second spring is pressed between the second spring seat and the valve core. A shoulder is also formed radially on the valve core. The inner wall of the valve sleeve is provided with a second limiting step corresponding to the shoulder to limit the initial position of the valve core. The medium can enter from the third oil port between the second limiting step and one side of the shoulder on the valve core to push the valve core away from the valve body of the one-way valve.

[0017] Furthermore, the balance valve also includes a pressure sleeve, which is threaded to the inner wall of the valve sleeve, and the second spring is disposed in the pressure sleeve;

[0018] A first gasket is provided between the pressure sleeve and the other side of the upper shoulder of the valve core. The first gasket is pressed against the pressing step provided on the inner wall of the valve sleeve. A second oil cavity is formed between the first gasket, the inner wall of the valve sleeve and the valve core. An oil drain groove is provided on the first gasket. A second oil drain port is provided in the valve sleeve. The oil drain groove is connected to one end of the second oil cavity and the second oil drain port. The other end of the second oil drain port is connected to the second oil port.

[0019] Furthermore, the first gasket is fitted onto the valve core with a clearance fit, and a second gasket is provided between the pressure sleeve and the first gasket. The second gasket protrudes toward the first gasket to form a convex ring, and sealing elements are respectively provided on the radially outer and radially inner sides of the convex ring.

[0020] Furthermore, the balance valve also includes a mounting base that surrounds the pressure sleeve. An adjusting screw is threaded onto the mounting base, the inner end of which acts on the second spring seat. A sealing lock nut is also provided on the outer end of the adjusting screw and the mounting base.

[0021] Furthermore, a third oil cavity is formed between the mounting base, the valve sleeve, and the second gasket, and the valve core is also provided with a connecting port in the middle that connects the third oil cavity and the first oil port.

[0022] Furthermore, the balancing valve also includes a mounting base, which is threaded to the outer wall of the valve sleeve, and the mounting base is provided with multiple mounting holes.

[0023] Furthermore, the end face of the insertion end of the valve sleeve is also provided with a fourth oil port in the axial direction, and the fourth oil port is connected to the first oil port.

[0024] By adopting the above technical solution, the balancing valve provided by this utility model has the following beneficial effects compared with the prior art:

[0025] 1. This utility model extends the cartridge end of the balance valve and radially sets a first oil port near the cartridge end. Since the high-pressure and high-flow-rate medium enters the valve from the radial direction, it can reduce pressure shock and improve the stability of the system.

[0026] 2. This utility model provides a first drain port on the valve body of the one-way valve, which connects the first oil chamber and the first oil port; when the balance valve opens and closes, it can quickly relieve pressure through the first drain port, and the valve body of the one-way valve can also quickly reset, thereby improving the dynamic response of the balance valve and avoiding the micro-movement phenomenon of the oil cylinder caused by the valve body not closing in time.

[0027] 3. This utility model provides an oil drain groove on the first gasket and a second oil drain port in the valve sleeve. When the valve core moves, it can reduce the resistance to its movement, thereby improving the dynamic response performance of the balance valve.

[0028] 4. This utility model has a mounting base connected to the valve sleeve, and the mounting base is provided with four mounting holes, which can be used with screws to fix the balance valve to the target position; under the condition of frequent opening and closing of the balance valve, it can withstand alternating pressure, improve the life of the balance valve, dynamic response, and the safety of the entire engineering machinery.

[0029] 5. This utility model also provides an axially connected port in the middle of the valve core, connecting the third oil chamber and the first oil port. By setting this port, the effective pressure area of ​​the valve core can be set more accurately, which is beneficial to improving the accuracy of the pilot ratio of the balance valve. Furthermore, the diameter of this port is very small, which can play a damping role when the pressure of the first oil port fluctuates, thus reducing the positional fluctuation of the valve core. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the balancing valve of this utility model;

[0031] Figure 2 This is a perspective view of the balance valve of this utility model;

[0032] Figure 3 This is a schematic diagram of the mounting base of this utility model;

[0033] Figure 4 This is a schematic diagram of the principle of the balance valve of this utility model.

[0034] in,

[0035] Valve sleeve 1, inner groove 11, first limiting step 12, second limiting step 13, clamping step 14; one-way valve 2, valve body 21, enclosing wall 211, first spring 22, first spring seat 23, elastic retaining ring for hole 24; valve core 31, shoulder 311, second spring 32, second spring seat 33, third gasket 34, pressure sleeve 35, first gasket 36, second gasket 37, convex ring 371; mounting base 4, mounting hole 41, adjusting screw 42, sealing lock nut 43;

[0036] First oil port 51, first oil hole 511, second oil port 52, second oil hole 521, third oil port 53, fourth oil port 54, connecting port 55; first oil cavity 61, second oil cavity 62, third oil cavity 63; first oil drain port 71, second oil drain port 72, oil drain groove 73; first sealing ring 81, second sealing ring 82, third sealing ring 83, fourth sealing ring 84, fifth sealing ring 85, sixth sealing ring 86, seventh sealing ring 87, eighth sealing ring 88, ninth sealing ring 89; first opening retaining ring 91, second opening retaining ring 92, third opening retaining ring 93. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0040] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0041] like Figure 1-2 As shown, this embodiment provides a balancing valve, which includes a valve sleeve 1, a one-way valve 2, and a valve core 31, wherein one end of the valve sleeve 1 is... Figure 1 Middle right end ( Figure 1(The image taken from the front view after rotating 90 degrees clockwise, the same below) forms the insertion end for installation. A first oil port 51 and a second oil port 52 are sequentially formed on the valve sleeve 1 from right to left along its axial direction from this insertion end. Both the first oil port 51 and the second oil port 52 are radially open. Further, the one-way valve 2 is disposed within the valve sleeve 1 and located between the second oil port 52 and the first oil port 51. The one-way valve 2 has a valve body 21, which can be pushed open to allow media such as oil to flow from the second oil port 52 to the first oil port 51. Further, the valve core 31 is slidably disposed within the valve sleeve 1 and located on the side of the one-way valve 2 biased towards the second oil port 52.

[0042] In the initial state, one end of the valve core 31 is... Figure 1 The right end of the valve core 31 seals against the left end of the valve body 21 of the check valve 2, preferably with a conical fit. A compression spring can be provided to act on both the valve core 31 and the valve body 21 of the check valve 2 to achieve this contact. When the medium enters from the second port 52 and the pressure is sufficient, the pressure acts on the valve body 21 of the check valve 2, causing it to move away from the valve core 31 towards the right, thereby releasing the seal between the valve core 31 and the valve body 21 of the check valve 2. The medium can then flow from the second port 52 to the first port 51. When the medium enters from the first port 51 and the pressure is sufficient, the pressure acts on the valve core 31, for example, at both ends of the valve core 31. The pressure difference causes the valve core 31 to move away from the valve body 21 towards the left, thereby releasing the seal between the valve core 31 and the valve body 21 of the check valve 2. The medium can then flow from the first port 51 to the second port 52.

[0043] Thus, the balancing valve provided in this embodiment, compared with the prior art, has an extended cartridge end and a first oil port 51 is radially arranged near the cartridge end. Since the high-pressure and high-flow-rate medium enters the valve from the radial direction, pressure shock can be reduced and the stability of the system can be improved.

[0044] Preferably, such as Figure 2 As shown, the first oil port 51 includes a plurality of circumferentially distributed first oil holes 511, and the second oil port 52 includes a plurality of circumferentially distributed second oil holes 521. The number of first oil holes 511 and second oil holes 521 can be set as needed; for example, in this embodiment, four are circumferentially distributed.

[0045] like Figure 1As shown, the one-way valve 2 in this embodiment includes a valve body 21, a first spring seat 23, and a first spring 22. The first spring seat 23 is fixedly installed on the side near the first oil port 51. For example, a limiting face is provided in the valve sleeve 1 to limit the left side of the first spring seat 23, and an inner groove 11 is provided in the valve sleeve 1 on the right side of the first spring seat 23. An elastic retaining ring 24 is inserted into the inner groove 11 through the hole to limit the right side of the first spring seat 23, thereby fixing the first spring seat 23. The valve body 21 is slidably disposed on the side near the second oil port 52. The first spring 22 is pressed between the first spring seat 23 and the valve body 21. A first limiting step 12 is also provided on the inner wall of the valve sleeve 1 between the valve body 21 and the second oil port 52. The first limiting step 12 is used to limit the extreme position of the valve body 21 on the side near the second oil port 52.

[0046] Furthermore, the center of the valve body 21 is through and communicates with the first oil port 51, and the center of the first spring seat 23 is also through, so that the medium can flow between the first oil port 51 and the second oil port 52 when the seal between the valve core 31 and the valve body 21 is released. The first spring seat 23, the inner wall of the valve sleeve 1 and the valve body 21 enclose a first oil cavity 61, and an enclosing wall 211 extends on the valve body 21, which extends to the center of the first spring seat 23 and does not affect the sliding of the valve body 21. A first drain port 71 communicating with the first oil cavity 61 and the first oil port 51 is also formed on the enclosing wall 211; when the balance valve opens and closes, the enclosed first oil cavity 61 can be quickly depressurized through the first drain port 71, and the valve body 21 of the one-way valve 2 can also be quickly reset, thereby improving the dynamic response of the balance valve and avoiding the micro-movement of the cylinder caused by the valve body 21 not closing in time. In other embodiments, the enclosing wall 211 may also be formed by extending on the first spring seat 23, but the structure of the valve body 21 needs to be adapted to ensure that the sliding of the valve body 21 is not affected.

[0047] See also Figure 1 In this embodiment, a third oil port 53 is radially provided on the valve sleeve 1. This third oil port 53 is located on the side of the second oil port 52 opposite to the first oil port 51, and preferably has one port and is preferably obliquely arranged. The other end of the valve core 31 is... Figure 1 The left end is also provided with a second spring 32 and a second spring seat 33. The left end of the second spring seat 33 is pressed or fixed, and the right end acts on the second spring 32. The second spring 32 is pressed between the second spring seat 33 and the valve core 31. Preferably, a third gasket 34 can be provided between the right end of the second spring 32 and the valve core 31 to stably press the valve core 31.

[0048] Furthermore, the middle section of the valve core 31 is radially formed with a shoulder 311. The inner wall of the valve sleeve 1 is also provided with a second limiting step 13 corresponding to this shoulder 311. This second limiting step 13 is located on the right side of the shoulder 311. When the second spring 32 pushes the valve core 31 until the right side of the shoulder 311 contacts the second limiting step 13, the valve core 31 is limited to its initial position. The third oil port 53 connects to the outside and the area between the second limiting step 13 and the right side of the shoulder 311 on the valve core 31. The medium can enter from the third oil port 53 between the second limiting step 13 and the right side of the shoulder 311 on the valve core 31 to assist in pushing the valve core 31 away from the valve body 21 of the one-way valve 2. A groove such as a relief groove can be provided at the edge corner of the shoulder 311 and the second limiting step 13, and the third oil port 53 connects to this groove and the outside.

[0049] The balance valve in this embodiment also includes a pressure sleeve 35, which is disposed at the left end of the valve sleeve 1 and threaded to the inner wall of the valve sleeve 1. The pressure sleeve 35 has a through-hole, and the second spring 32 and the third washer 34 are disposed in the pressure sleeve 35 to enable stable movement. A portion of the second spring seat 33 is also disposed in the pressure sleeve 35.

[0050] Furthermore, a first gasket 36 is provided between the pressure sleeve 35 and the other side of the shoulder 311 on the valve core 31. A pressing step 14 is provided on the inner wall of the valve sleeve 1, and the first gasket 36 is directly or indirectly pressed onto the pressing step 14 by the pressure sleeve 35. The first gasket 36, the inner wall of the valve sleeve 1, the valve core 31 and its shoulder 311 enclose a second oil cavity 62. An oil drain groove 73 is provided on the first gasket 36, and a second oil drain port 72 is provided in the valve sleeve 1. The oil drain groove 73 connects to one end of the second oil cavity 62 and the second oil drain port 72, and the other end of the second oil drain port 72 connects to the second oil port 52. In this way, by providing the oil drain groove 73 and the second oil drain port 72, when the valve core 31 moves, the resistance to its movement can be reduced, thereby improving the dynamic response performance of the balance valve.

[0051] Since the first gasket 36 needs to be pressed against the pressing step 14, the oil drain groove 73 is only opened with a certain arc in the circumferential direction to ensure that both pressing and connection can be achieved. Based on this, the shape and size of the oil drain groove 73 can be set as needed, for example, the oil drain groove 73 can be set in a certain position. Figure 1 The upper part shown is connected to the first end of the second oil drain port 72 of the lower part through grooves such as the radially outer circumferential relief groove; alternatively, the oil drain groove 73 can be directly set in Figure 1 The lower half of the middle part is directly in contact with and connected to the first end of the second oil drain port 72.

[0052] Furthermore, in this embodiment, a first gasket 36 is fitted onto the valve core 31 with a clearance fit. A second gasket 37 is also pressed between the pressure sleeve 35 and the first gasket 36. The second gasket 37 protrudes towards the first gasket 36 to form a raised ring 371. Sealing elements, optionally but not limited to, are provided on the radially outer and radially inner sides of this raised ring 371. This allows for easier installation of the sealing elements and achieves a better sealing effect.

[0053] like Figure 1-3 As shown, the balance valve in this embodiment also includes a mounting base 4, which is threaded to the outer wall of the valve sleeve 1. The mounting base 4 has multiple axial mounting holes 41, for example, four mounting holes 41, which are either squarely distributed or evenly distributed along the circumference. The balance valve can be fixed to the target position on the construction machinery using screws through these four mounting holes 41. Under frequent opening and closing conditions, the balance valve can withstand alternating pressure, improving its lifespan, dynamic response, and the overall safety of the construction machinery.

[0054] Furthermore, the mounting base 4 is arranged around the pressure sleeve 35, and an adjusting screw 42 is threadedly connected to the center of the left end of the mounting base 4. The inner end of the adjusting screw 42 acts on the second spring seat 33. By rotating this adjusting screw 42, the position of the second spring seat 33 can be adjusted, thereby adjusting the initial pressure applied by the second spring 32 to the valve core 31. In this embodiment, a sealing lock nut 43 is also provided at the outer end of the adjusting screw 42 and the mounting base 4. After adjustment, the sealing lock nut 43 is used for sealing and locking.

[0055] Furthermore, in this embodiment, a third oil chamber 63 is formed between the mounting base 4, the valve sleeve 1, and the second gasket 37. A connecting port 55, axially connecting the third oil chamber 63 and the first oil port 51, is also provided in the middle of the valve core 31. Since the effective pressure area of ​​the first oil port 51 on the valve core 31 is the annular area formed by the difference in dimensions at both ends of the valve core 31, by providing this connecting port 55, the effective pressure area of ​​the valve core 31 can be set more accurately, which is beneficial to improving the accuracy of the pilot ratio of the balance valve, and also facilitates the accurate design of other pilot ratios. Moreover, the diameter of the connecting port 55 is very small, which can play a damping role when the pressure of the first oil port 51 fluctuates, reducing the positional fluctuation of the valve core 31.

[0056] Preferably, in this embodiment, a fourth oil port 54 is axially provided on the end face of the insertion end of the valve sleeve 1, and the fourth oil port 54 is connected to the first oil port 51. This facilitates the processing of the valve sleeve 1, and the user can select the oil inlet method as needed. For example, oil can be introduced from both the radially arranged first oil port 51 and the axially arranged fourth oil port 54 at the same time. Since some oil enters from the radial direction, it can also play a certain role in mitigating impact.

[0057] Furthermore, this embodiment also requires an adaptively designed sealing structure. For example, a first sealing ring 81 is provided on the radially outer side of the main body of the valve body 21 of the one-way valve 2; a second sealing ring 82 and a third sealing ring 83 are provided on the radially outer side of the valve core 31, located on both sides of the third oil port 53; a fourth sealing ring 84 and a fifth sealing ring 85 are provided on the radially inner and radially outer sides of the convex ring 371 of the second gasket 37; a sixth sealing ring 86 is provided on the outer wall of the valve sleeve 1, located between the first oil port 51 and the second oil port 52, which can be used in conjunction with the first opening retaining ring 91 to improve stability and reliability; a seventh sealing ring 87 is provided on the outer wall of the valve sleeve 1, located between the second oil port 52 and the third oil port 53, which can be used in conjunction with the second opening retaining ring 92; an eighth sealing ring 88 is provided on the outer wall of the valve sleeve 1, located between the third oil port 53 and the mounting base 4, which can be used in conjunction with the third opening retaining ring 93; and a ninth sealing ring 89 is provided between the inner wall of the mounting base 4 and the outer wall of the valve sleeve 1. The type of sealing ring can be set as needed, such as a rod sealing ring, a hole sealing ring, a Glyd ring, an O-ring, etc.

[0058] Before operation, the balance valve in this embodiment first sets the overflow pressure according to requirements: the medium enters through the first oil port 51, and then enters the third oil chamber 63 through the connecting port 55 in the center of the valve core 31. The effective area of ​​the pressure at the first oil port 51 on the valve core 31 is the annular area formed by the difference in size between the two ends of the valve core 31. When the pressure difference is large enough, it can push the valve core 31 to move. The second oil port 52 serves as the return oil port; when the valve core 31 is pushed, the medium returns through the second oil port 52. By adjusting the adjusting screw 42, the second spring seat 33 is moved, thereby adjusting the compression of the second spring 32 to achieve the required set pressure.

[0059] Combination Figure 4 In this embodiment, when the balance valve is working, in the first working condition, the medium enters the valve sleeve 1 through the second oil port 52, and the resulting pressure difference pushes the valve body 21 of the one-way valve 2 to move, while compressing the first spring 22. The medium can flow from between the valve body 21 and the valve core 31 to the first oil port 51. When the equipment is shut down or the pressure of the second oil port 52 is unloaded, the valve body 21 of the one-way valve 2 will reset and move in the opposite direction under the action of the first spring 22. The first drain port 71 provided on the valve body 21 can accelerate the reset of the valve body 21.

[0060] In the second operating scenario, the medium enters through the radially opened first oil port 51 and passes through the central connecting port 55 of the valve core 31 into the third oil chamber 63. When the pressure difference created by the pressure at the first oil port 51 on the valve core 31 is insufficient to move the valve core 31, the medium simultaneously enters the third oil port 53, creating a pressure difference on the valve core 31. The two pressure differences act simultaneously, pushing the valve core 31 to move. The second oil port 52 serves as a return port, allowing the medium to return oil. Furthermore, as the valve core 31 moves, oil can be quickly drained through the drain groove 73 and the second drain port 72, reducing the resistance to the valve core 31's movement. Thus, the movement distance of the valve core 31 can be controlled by controlling the pressure at the third oil port 53.

[0061] As can be seen from the above, the balancing valve provided in this embodiment reduces the impact of high pressure and high flow by radially opening a first oil port at the cartridge end of the balancing valve, thus forming a high flow balancing valve. In addition, it also has the advantages of high response, high stability, high integration and low flow resistance.

[0062] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A balanced valve, characterized in that, include: Valve sleeve (1), wherein a first oil port (51) and a second oil port (52) are formed radially from the insertion end on the valve sleeve (1); A one-way valve (2) is disposed inside the valve sleeve (1) and located between the second oil port (52) and the first oil port (51); Valve core (31), which is slidably disposed within the valve sleeve (1); In the initial state, one end of the valve core (31) is sealed and abuts against the valve body (21) of the one-way valve (2); when the medium enters from the second oil port (52), it acts on the valve body (21) of the one-way valve (2) to make the valve body (21) move away from the valve core (31); when the medium enters from the first oil port (51), it acts on one end of the valve core (31) to make the valve core (31) move away from the valve body (21).

2. Balanced valve according to claim 1, characterized in that The first oil port (51) includes a plurality of circumferentially distributed first oil holes (511); the second oil port (52) includes a plurality of circumferentially distributed second oil holes (521).

3. Balanced valve according to claim 1, characterized in that The one-way valve (2) includes a valve body (21), a first spring (22) and a first spring seat (23). The first spring seat (23) is fixedly installed on the side near the first oil port (51). The valve body (21) is slidably disposed on the side near the second oil port (52). The first spring (22) is pressed between the first spring seat (23) and the valve body (21). The center of the valve body (21) is connected to the first oil port (51). A first oil cavity (61) is formed between the first spring seat (23), the inner wall of the valve sleeve (1) and the valve body (21). A first drain port (71) is formed on the enclosing wall (211) of the valve body (21) or the first spring seat (23) to connect the first oil cavity (61) and the first oil port (51).

4. The balanced valve of claim 1, wherein The valve sleeve (1) is also provided with a third oil port (53) radially, and the third oil port (53) is located on the side of the second oil port (52) away from the first oil port (51); The other end of the valve core (31) is provided with a second spring (32) and a second spring seat (33). The second spring (32) is pressed between the second spring seat (33) and the valve core (31). A shoulder (311) is also formed radially on the valve core (31). The inner wall of the valve sleeve (1) is also provided with a second limiting step (13) corresponding to the shoulder (311) to limit the initial position of the valve core (31). The medium can enter from the third oil port (53) between the second limiting step (13) and one side of the shoulder (311) on the valve core (31) to push the valve core (31) away from the valve body (21) of the one-way valve (2).

5. Balanced valve according to claim 4, characterized in that The balance valve also includes a pressure sleeve (35), which is threaded to the inner wall of the valve sleeve (1), and the second spring (32) is disposed in the pressure sleeve (35); A first gasket (36) is provided between the pressure sleeve (35) and the other side of the shoulder (311) on the valve core (31). The first gasket (36) is pressed against the pressing step (14) provided on the inner wall of the valve sleeve (1). A second oil cavity (62) is formed between the first gasket (36), the inner wall of the valve sleeve (1) and the valve core (31). An oil drain groove (73) is provided on the first gasket (36). A second oil drain port (72) is provided in the valve sleeve (1). The oil drain groove (73) is connected to one end of the second oil cavity (62) and the second oil drain port (72). The other end of the second oil drain port (72) is connected to the second oil port (52).

6. Balanced valve according to claim 5, characterized in that The first gasket (36) is fitted onto the valve core (31) with a clearance fit. A second gasket (37) is provided between the pressure sleeve (35) and the first gasket (36). The second gasket (37) protrudes toward the first gasket (36) to form a convex ring (371). Sealing elements are provided on the radial outer side and radial inner side of the convex ring (371).

7. Balanced valve according to claim 6, characterized in that The balance valve also includes a mounting base (4), which surrounds the pressure sleeve (35). An adjusting screw (42) is also threaded onto the mounting base (4). The inner end of the adjusting screw (42) acts on the second spring seat (33). The outer ends of the adjusting screw (42) and the mounting base (4) are also provided with sealing lock nuts (43).

8. Balanced valve according to claim 7, characterized in that The mounting base (4), valve sleeve (1), and second gasket (37) form a third oil chamber (63), and the valve core (31) is also provided with a connecting port (55) in the middle to connect the third oil chamber (63) and the first oil port (51).

9. Balanced valve according to claim 1 or 7, characterized in that The balancing valve also includes a mounting base (4), which is threaded to the outer wall of the valve sleeve (1), and the mounting base (4) is provided with a plurality of mounting holes (41).

10. The balanced valve of claim 1, wherein The valve sleeve (1) is provided with a fourth oil port (54) on the end face of the insertion end, and the fourth oil port (54) is connected to the first oil port (51).

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