Hydraulic valves and hydraulic actuators

Abstract

This utility model belongs to the field of hydraulic technology, specifically relating to a hydraulic valve and a hydraulic actuation system. The hydraulic valve includes: a control module, a valve body, a movable unit, a variable diameter actuation unit, a feedback detection unit, and an actuation unit. Hydraulic oil is injected into the upper or lower oil chamber to drive the movable unit, variable diameter actuation unit, and actuation unit to move axially along the valve body, and the variable diameter actuation unit is adapted to push the feedback detection unit to move radially along the valve body. The control module is configured to detect the trigger signal of the feedback detection unit to obtain the movement position of the movable unit within the valve body. This utility model uses the movable unit to drive the variable diameter actuation unit and the actuation unit to move axially within the valve body, thereby physically driving the feedback detection unit to move radially along the valve body. The feedback detection unit can detect the movement position of the movable unit within the valve body in real time and quickly, thus accurately reflecting the actuation state of the hydraulic valve.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic technology, specifically relating to valves, and more particularly to a hydraulic valve and hydraulic actuation system. Background Technology

[0002] Traditional hydraulic valves use the pressure of hydraulic oil to push the valve core and have an electronic sensor at the valve to detect the valve opening. However, the electronic sensor itself has a limited response time, which causes errors between the detected value and the actual value.

[0003] Therefore, there is an urgent need to develop a new hydraulic valve and hydraulic actuation system to solve the technical problem of errors between the detected value and the actual value caused by the installation of electronic sensors at the valve to detect the valve opening in traditional hydraulic valves.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0005] This disclosure provides at least one hydraulic valve and a hydraulic actuation system.

[0006] In a first aspect, embodiments of this disclosure provide a hydraulic valve, comprising: a control module, a valve body, a movable unit, a diameter-changing actuating unit, a feedback detection unit, and an execution unit; wherein the movable unit and the diameter-changing actuating unit are movably disposed within the valve body, the valve body having an upper oil chamber and a lower oil chamber, the upper oil chamber and the lower oil chamber being located on opposite sides of the movable unit; the diameter-changing actuating unit is connected to the movable unit, the feedback detection unit elastically abuts against the diameter-changing actuating unit, and the feedback detection unit is electrically connected to the control module; the execution unit is connected to the diameter-changing actuating unit; hydraulic oil is injected into the upper or lower oil chamber to push the movable unit, the diameter-changing actuating unit, and the execution unit to move axially along the valve body, and the diameter-changing actuating unit is adapted to push the feedback detection unit to move radially along the valve body; and the control module is configured to obtain the moving position of the movable unit within the valve body by detecting a trigger signal from the feedback detection unit.

[0007] In one optional embodiment, the movable unit includes: a piston; the piston is located in the valve body and is arranged along the axial direction of the valve body, and the upper oil chamber and the lower oil chamber are respectively located on both sides of the piston; the upper oil chamber or the lower oil chamber is adapted to inject hydraulic oil to push the piston to move along the axial direction of the valve body.

[0008] In one optional embodiment, the movable unit further includes: a connector; the connector is connected to the piston and the variable diameter push unit respectively; the piston is adapted to drive the variable diameter push unit to move axially along the valve body via the connector.

[0009] In one optional embodiment, the variable diameter actuation unit includes: a variable diameter component; the variable diameter component is located inside the valve body and is arranged along the axial direction of the valve body, and the variable diameter component is connected to the piston through a connector; the feedback detection unit is located inside the valve body and is arranged along the radial direction of the valve body, and the feedback detection unit is in elastic contact with the variable diameter component; the variable diameter component moves along the axial direction of the valve body under the drive of the piston, thereby pushing the feedback detection unit to move along the radial direction of the valve body.

[0010] In one alternative embodiment, the variable diameter member is arranged in a columnar shape, and the diameter of the variable diameter member is gradually changed.

[0011] In one optional embodiment, the feedback detection unit includes: a contact rod, an elastic element, a first trigger block, a second trigger block, a first trigger switch, and a second trigger switch; a first mounting groove and a second mounting groove are provided in the valve body; the contact rod moves radially along the valve body, passes through the first mounting groove and the second mounting groove, and abuts against the variable diameter component; the elastic element is located in the first mounting groove and is movably connected to the contact rod; the first trigger block, the second trigger block, the first trigger switch, and the second trigger switch are located in the second mounting groove; the first trigger block and the second trigger block are connected to the contact rod; the first trigger block and the second trigger block are located between the first trigger switch and the second trigger switch; the first trigger switch and the second trigger switch are electrically connected to the control module; the variable diameter component is adapted to push the contact rod and the elastic element to move radially along the valve body, so that the first trigger block touches the first trigger switch or the second trigger block touches the second trigger switch; the control module is configured to obtain the movement position of the piston in the valve body by detecting the trigger signal of the first trigger switch and the trigger signal of the second trigger switch.

[0012] In one optional embodiment, the actuation unit includes: a hydraulic actuator; the hydraulic actuator is connected to a reducing member and a load respectively; the hydraulic actuator is adapted to move axially along the valve body under the drive of the reducing member, so as to drive the load to move axially along the valve body.

[0013] In one alternative embodiment, the piston and the valve body are in contact through a corresponding sealing ring to separate the upper oil chamber and the lower oil chamber.

[0014] In one optional embodiment, a top cover and a bottom cover are respectively provided on both sides of the valve body.

[0015] Secondly, embodiments of this disclosure also provide a hydraulic actuation system, which includes: employing a hydraulic valve as described above.

[0016] The beneficial effect of this utility model is that the movable unit drives the variable diameter push unit and the execution unit to move axially in the valve body, thereby physically pushing the feedback detection unit to move radially in the valve body. The feedback detection unit can detect the movement position of the movable unit in the valve body in real time and quickly, thus accurately reflecting the execution state of the hydraulic valve.

[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A front sectional view of a hydraulic valve provided in an embodiment of this disclosure;

[0021] Figure 2 A side sectional view of a hydraulic valve provided in an embodiment of this disclosure;

[0022] Figure 3 This is a structural diagram of a feedback detection unit provided in an embodiment of the present disclosure;

[0023] Figure 4 This is a schematic diagram of a hydraulic valve provided in an embodiment of the present disclosure.

[0024] In the picture:

[0025] 1. Valve body; 11. Upper oil chamber; 12. Lower oil chamber; 13. First mounting groove; 14. Second mounting groove;

[0026] 2. Moving unit; 21. Piston; 22. Connecting component;

[0027] 3. Variable diameter drive unit; 31. Variable diameter component;

[0028] 4. Feedback detection unit; 41. Abutment rod; 42. Elastic element; 43. First trigger block; 44. Second trigger block; 45. First trigger switch; 46. Second trigger switch;

[0029] 5. Actuation unit; 51. Hydraulic actuator;

[0030] 6. Sealing ring;

[0031] 7. Top cover;

[0032] 8. Bottom cover;

[0033] F1, axial; F2, radial. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0036] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0037] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0038] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0039] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0042] like Figures 1 to 4As shown, at least one embodiment provides a hydraulic valve, comprising: a control module, a valve body 1, a movable unit 2, a variable diameter actuation unit 3, a feedback detection unit 4, and an execution unit 5; wherein the movable unit 2 and the variable diameter actuation unit 3 are movably disposed within the valve body 1, the valve body 1 having an upper oil chamber 11 and a lower oil chamber 12, the upper oil chamber 11 and the lower oil chamber 12 being located on opposite sides of the movable unit 2; the variable diameter actuation unit 3 is connected to the movable unit 2, the feedback detection unit 4 elastically abuts against the variable diameter actuation unit 3, and the feedback detection unit 4 is electrically connected to the control module; the execution unit 5 is connected to the variable diameter actuation unit 3; hydraulic oil is injected into the upper oil chamber 11 or the lower oil chamber 12 to actuate the movable unit 2, the variable diameter actuation unit 3, and the execution unit 5 along the axial direction F1 of the valve body 1, and the variable diameter actuation unit 3 is adapted to push the feedback detection unit 4 to move along the radial direction F2 of the valve body 1; and the control module is configured to obtain the moving position of the movable unit 2 within the valve body 1 by detecting the trigger signal of the feedback detection unit 4.

[0043] Specifically, the control module can be, but is not limited to, an STM32 series microcontroller.

[0044] In at least one embodiment, the movable unit 2 drives the variable diameter pushing unit 3 and the execution unit 5 to move along the axial direction F1 in the valve body 1, thereby physically pushing the feedback detection unit 4 to move along the radial direction F2 in the valve body 1. The feedback detection unit 4 can detect the movement position of the movable unit 2 in the valve body 1 in real time and quickly, that is, accurately reflect the execution state of the hydraulic valve.

[0045] In at least one embodiment, please refer to Figure 1 , Figure 2 The movable unit 2 includes: a piston 21; the piston 21 is located inside the valve body 1 and is arranged along the axial direction F1 of the valve body 1, and the upper oil chamber 11 and the lower oil chamber 12 are respectively located on both sides of the piston 21; the upper oil chamber 11 or the lower oil chamber 12 is adapted to inject hydraulic oil to push the piston 21 to move along the axial direction F1 of the valve body 1.

[0046] Specifically, piston 21 plays a driving role. Under the push of hydraulic oil, piston 21 moves axially F1 within valve body 1, thereby driving actuator 5 to move axially F1, thus driving valve action.

[0047] In at least one embodiment, please refer to Figure 1 , Figure 2 The active unit 2 further includes a connector 22; the connector 22 is connected to the piston 21 and the variable diameter push unit 3 respectively; the piston 21 is adapted to drive the variable diameter push unit 3 to move along the axial direction F1 of the valve body 1 through the connector 22.

[0048] Specifically, the connector 22 connects the piston 21 and the variable diameter push unit 3 via corresponding splines, and the connector 22 can connect the piston 21 and the variable diameter push unit 3 in the axial direction F1 of the valve body 1, thereby realizing the linkage between the piston 21 and the variable diameter push unit 3.

[0049] In at least one embodiment, please refer to Figure 1 , Figure 2 The variable diameter pushing unit 3 includes: a variable diameter component 31; the variable diameter component 31 is located inside the valve body 1 and is arranged along the axial direction F1 of the valve body 1, and the variable diameter component 31 is connected to the piston 21 through a connecting member 22; the feedback detection unit 4 is located inside the valve body 1 and is arranged along the radial direction F2 of the valve body 1, and the feedback detection unit 4 is in elastic contact with the variable diameter component 31; the variable diameter component 31 moves along the axial direction F1 of the valve body 1 under the drive of the piston 21, thereby pushing the feedback detection unit 4 to move along the radial direction F2 of the valve body 1.

[0050] Specifically, since the feedback detection unit 4 is in elastic contact with the variable diameter component 31, and the piston 21 moves within the valve body 1, causing the variable diameter component 31 to move, the contact positions between the feedback detection unit 4 and the variable diameter component 31 are different, thus enabling the variable diameter component 31 to push against the feedback detection unit 4.

[0051] In at least one embodiment, please refer to Figure 1 , Figure 2 The variable diameter component 31 is columnar in shape, and its diameter gradually changes.

[0052] In at least one embodiment, please refer to Figure 3The feedback detection unit 4 includes: an abutment rod 41, an elastic element 42, a first trigger block 43, a second trigger block 44, a first trigger switch 45, and a second trigger switch 46; the valve body 1 has a first mounting groove 13 and a second mounting groove 14; the abutment rod 41 moves radially F2 along the valve body 1, passes through the first mounting groove 13 and the second mounting groove 14, and abuts against the reducing element 31; the elastic element 42 is located in the first mounting groove 13 and is movably connected to the abutment rod 41; the first trigger block 43, the second trigger block 44, the first trigger switch 45, and the second trigger switch 46 are located in the second mounting groove 14 ... The trigger block 44 is connected to the abutment rod 41. The first trigger block 43 and the second trigger block 44 are located between the first trigger switch 45 and the second trigger switch 46. The first trigger switch 45 and the second trigger switch 46 are electrically connected to the control module. The variable diameter member 31 is adapted to push the abutment rod 41 and the elastic member 42 to move radially F2 along the valve body 1, so that the first trigger block 43 touches the first trigger switch 45 or the second trigger block 44 touches the second trigger switch 46. The control module is configured to obtain the moving position of the piston 21 in the valve body 1 by detecting the trigger signal of the first trigger switch 45 and the trigger signal of the second trigger switch 46.

[0053] Specifically, the elastic element 42 can be a spring.

[0054] Specifically, the first trigger switch 45 and the second trigger switch 46 are micro switches, which output trigger signals when touched by the corresponding trigger blocks, thereby enabling the positioning of the piston 21.

[0055] Specifically, the abutment rod 41 is pushed by the diameter changer 31 to press the elastic member 42 to move. When the diameter changer 31 is reset, the elastic member 42 pushes the abutment rod 41 to always be in contact with the diameter changer 31.

[0056] In at least one embodiment, please refer to Figure 1 , Figure 2 The execution unit 5 includes a hydraulic actuator 51; the hydraulic actuator 51 is connected to the variable diameter member 31 and the load respectively; the hydraulic actuator 51 is adapted to move along the axial direction F1 of the valve body 1 under the drive of the variable diameter member 31, so as to drive the load to move along the axial direction F1 of the valve body 1.

[0057] Specifically, the hydraulic actuator 51 is capable of transmitting power.

[0058] In at least one embodiment, please refer to Figure 1 , Figure 2 The piston 21 is in contact with the valve body 1 through a corresponding sealing ring 6 to separate the upper oil chamber 11 and the lower oil chamber 12.

[0059] Specifically, the sealing ring 6 ensures that the pressure of the hydraulic oil in the upper oil chamber 11 and the lower oil chamber 12 is independent of each other.

[0060] In at least one embodiment, please refer to Figure 1 The valve body 1 is provided with a top cover 7 and a bottom cover 8 on both sides respectively.

[0061] Specifically, the top cover 7 and the bottom cover 8 serve a sealing function.

[0062] Based on the same technical concept, at least one embodiment also provides a hydraulic actuation system, which includes: employing a hydraulic valve as described above.

[0063] In summary, this utility model uses a movable unit to drive a variable diameter push unit and an execution unit to move axially within the valve body, thereby physically pushing a feedback detection unit to move radially within the valve body. The feedback detection unit can detect the movement position of the movable unit within the valve body in real time and quickly, thus accurately reflecting the execution state of the hydraulic valve.

[0064] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0065] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0066] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0067] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0068] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A fluid power valve, characterized by include: The control module comprises a valve body (1), an actuating unit (2), a variable diameter actuating unit (3), a feedback detection unit (4), and an actuating unit (5); among which... The movable unit (2) and the variable diameter push unit (3) are movably arranged inside the valve body (1). The valve body (1) has an upper oil chamber (11) and a lower oil chamber (12), and the upper oil chamber (11) and the lower oil chamber (12) are located on both sides of the movable unit (2). The variable diameter pushing unit (3) is connected to the moving unit (2), the feedback detection unit (4) is elastically abutted against the variable diameter pushing unit (3), and the feedback detection unit (4) is electrically connected to the control module; The execution unit (5) is connected to the variable diameter drive unit (3); Hydraulic oil is injected into the upper oil chamber (11) or lower oil chamber (12) to drive the movable unit (2), the variable diameter drive unit (3) and the execution unit (5) to move along the axial direction (F1) of the valve body (1), and the variable diameter drive unit (3) is adapted to push the feedback detection unit (4) to move along the radial direction (F2) of the valve body (1). as well as The control module is configured to obtain the movement position of the active unit (2) within the valve body (1) by detecting the trigger signal of the feedback detection unit (4).

2. The hydraulic valve as described in claim 1, characterized in that, The active unit (2) includes: piston (21); The piston (21) is located inside the valve body (1) and is arranged along the axial direction (F1) of the valve body (1), and the upper oil chamber (11) and the lower oil chamber (12) are located on both sides of the piston (21); The upper oil chamber (11) or lower oil chamber (12) is suitable for injecting hydraulic oil to push the piston (21) to move along the axial direction (F1) of the valve body (1).

3. The hydraulic valve as described in claim 2, characterized in that, The active unit (2) further includes: a connector (22); The connecting piece (22) is connected to the piston (21) and the variable diameter push unit (3) respectively; The piston (21) is adapted to drive the variable diameter push unit (3) to move along the axial direction (F1) of the valve body (1) via the connecting member (22).

4. The hydraulic valve as described in claim 3, characterized in that, The variable diameter drive unit (3) includes: a variable diameter component (31); The variable diameter component (31) is located inside the valve body (1) and is arranged along the axial direction (F1) of the valve body (1). The variable diameter component (31) is connected to the piston (21) through the connector (22). The feedback detection unit (4) is located inside the valve body (1) and is arranged along the radial direction (F2) of the valve body (1), and the feedback detection unit (4) is in elastic contact with the variable diameter part (31); The variable diameter component (31) moves along the axial direction (F1) of the valve body (1) under the drive of the piston (21), thereby pushing the feedback detection unit (4) to move along the radial direction (F2) of the valve body (1).

5. The hydraulic valve as described in claim 4, characterized in that, The variable diameter component (31) is columnar, and the diameter of the variable diameter component (31) is gradually changing.

6. The hydraulic valve as described in claim 4, characterized in that, The feedback detection unit (4) includes: abutment rod (41), elastic element (42), first trigger block (43), second trigger block (44), first trigger switch (45), and second trigger switch (46); The valve body (1) is provided with a first mounting groove (13) and a second mounting groove (14). The abutting rod (41) moves along the radial direction (F2) of the valve body (1), passes through the first mounting groove (13) and the second mounting groove (14), and abuts against the reducing part (31). The elastic element (42) is located in the first mounting groove (13) and is movably connected to the abutment rod (41). The first trigger block (43), the second trigger block (44), the first trigger switch (45), and the second trigger switch (46) are located in the second mounting groove (14). The first trigger block (43) and the second trigger block (44) are connected to the abutment rod (41). The first trigger block (43) and the second trigger block (44) are located between the first trigger switch (45) and the second trigger switch (46). The first trigger switch (45) and the second trigger switch (46) are electrically connected to the control module; The variable diameter component (31) is adapted to push the abutting rod (41) and the elastic component (42) to move radially (F2) along the valve body (1) so that the first trigger block (43) touches the first trigger switch (45) or the second trigger block (44) touches the second trigger switch (46). The control module is configured to obtain the movement position of the piston (21) within the valve body (1) by detecting the trigger signal of the first trigger switch (45) and the trigger signal of the second trigger switch (46).

7. The hydraulic valve as described in claim 4, characterized in that, The execution unit (5) includes: a hydraulic actuator (51); The hydraulic actuator (51) is connected to the variable diameter component (31) and the load respectively; The hydraulic actuator (51) is adapted to move along the axial direction (F1) of the valve body (1) under the drive of the variable diameter member (31) so as to drive the load to move along the axial direction (F1) of the valve body (1).

8. The hydraulic valve as described in claim 2, characterized in that, The piston (21) and the valve body (1) are in contact through a corresponding sealing ring (6) to separate the upper oil chamber (11) and the lower oil chamber (12).

9. The hydraulic valve as described in claim 1, characterized in that, The valve body (1) is provided with a top cover (7) and a bottom cover (8) on both sides respectively.

10. A fluid power actuation system, characterized by include: The hydraulic valve described in any one of claims 1-9 is used.

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