Hydraulic valve for hydraulic transmission

Abstract

The utility model provides a hydraulic valve for hydraulic transmission, which belongs to the technical field of hydraulic valves and comprises a valve body, a liquid inlet channel extending to an inner cavity is arranged at a liquid inlet of the valve body, a top plug is embedded into the inner wall of the tail end of the liquid inlet channel, and a sealing plug is embedded into the inner wall of the starting end of a liquid separation channel. A hydraulic linkage assembly is arranged on the side wall, where the liquid distribution openings are located, of the valve body, after liquid flows into the liquid inlet channels through the liquid inlets, the top plugs at the tail ends of the liquid inlet channels are pushed to move through the pressure of the liquid, the top plugs drive the sealing plugs to move through the hydraulic linkage assembly, the three liquid distribution channels are opened, and therefore the liquid is distributed through the hydraulic valve, and the liquid distribution effect is improved. According to the hydraulic valve, the three liquid separation channels are arranged, so that the liquid flows on the three liquid separation channels are the same, the influence on the working environment where the hydraulic valve is located is avoided, the outlets of the liquid separation channels can be selectively closed according to the use scene of the hydraulic valve, and the hydraulic valve has applicability by embedding the sealing plug into the liquid outlet.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a hydraulic valve for hydraulic transmission. Background Art

[0002] Hydraulic valves play a vital role in hydraulic transmission systems, controlling the flow direction, pressure and flow of fluids.

[0003] The related technology (publication number: CN208997062U) discloses a hydraulic valve for hydraulic transmission, and the disclosed technical solution is as follows: through the mutual cooperation between the clamping rod, the fixing nut and the extension rod, the fixing nut is rotated to release the limiting effect of the fixing nut on the clamping rod, and the clamping rod moves to the right inside the limiting groove and is clamped into the inside of the clamping groove on the left side of the extension rod. When the hydraulic pressure provides upward pressure to the extension rod through the piston, the clamping rod can limit the upward movement distance of the extension rod so that only a very small opening can be left at the intersection of the sealing gasket and the liquid inlet channel and the liquid outlet channel, thereby achieving the purpose of limiting the amount of liquid passing through the hydraulic valve, thereby improving the practicality of the hydraulic valve.

[0004] In the above-mentioned disclosed technical solutions, the following problems were found in the related technologies: the circulation mode of a single channel of a hydraulic valve cannot use a multi-port situation. When controlling multiple channels through a hydraulic valve, it is necessary to ensure that the flow in each channel is uniform. Once the flow in each circulation channel is uneven, it will affect the control accuracy, resulting in unstable system performance, which may affect the quality of the final product. Uneven flow may cause overheating in certain areas, because the flow rate of the fluid in these areas is slow, and the heat is not easy to dissipate. It will also affect the thermal stability and life of the system components. In this regard, we have proposed a new type of hydraulic valve for hydraulic transmission.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background technology section of this application, and therefore may include prior art information that does not constitute known to ordinary technicians in the field. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology. In order to solve the problem of uniform flow distribution in the above-mentioned prior art, the utility model provides a hydraulic valve for hydraulic transmission, which adopts a hydraulic flow distribution structure combined with a flow distribution port flow prompt structure to achieve the effect of improving the applicability of the hydraulic valve. The specific technical solution is:

[0007] A hydraulic valve for hydraulic transmission comprises a valve body, wherein a liquid inlet channel extending to an inner cavity is arranged at a liquid inlet of the valve body, liquid separation channels are evenly opened on the outer wall of the valve body, and the liquid inlet channel and the liquid separation channel are connected through the inner cavity of the valve body, a top plug is embedded in the inner wall at the end of the liquid inlet channel, and a sealing plug is embedded in the inner wall at the beginning of the liquid separation channel, a hydraulic linkage assembly is arranged on the side wall where the liquid separation port of the valve body is located, and the hydraulic linkage assembly drives the sealing plug and the top plug to move in opposite directions at the same time.

[0008] In the above technical solution, the hydraulic linkage assembly includes a transmission member fixedly connected to the side of the top plug close to the liquid separation channel, and the end of the transmission member away from the top plug passes through the side wall of the valve body and extends to the outside, a bracket is fixedly installed on the outer wall where the liquid separation port of the valve body is located, a fixed frame is fixedly installed inside the bracket, a linkage frame is slidably arranged inside the bracket, and each of the sealing plugs is connected to the linkage frame by a linkage member passing through the side wall of the valve body, and a bidirectional linkage component is arranged on the outer wall of the valve body to drive the transmission member and the linkage frame to move in opposite directions at the same time.

[0009] The two-way linkage component includes a linkage cylinder rotatably arranged on the fixed frame, the bottom end of the linkage cylinder is provided with a rotation guide groove spirally along the inner wall, the top end of the outer wall of the transmission member is provided with a driving guide block, and the driving guide block is slidably arranged on the rotation guide groove, and the linkage frame is threadedly connected to the outside of the linkage cylinder.

[0010] One end of a sliding rod is provided on the side of the sealing plug away from the liquid outlet, and the other end of the sliding rod extends to the inner cavity of the valve body. A pushing piece is fixedly installed on the outer wall of the end of the sliding rod away from the sealing plug. A prompt rod is embedded on the side wall of the valve body, and the end of the prompt rod located in the inner cavity of the valve body is attached to the side wall of the pushing piece. The outer cover of the prompt rod is provided with an outer cover fixedly connected to the side wall of the valve body, and the outer cover and the prompt rod are connected by an elastic member.

[0011] The outer cover is made of transparent material.

[0012] The inner wall of the bracket is provided with a directional sliding groove, and directional guide seats slidably arranged inside the directional sliding groove are fixedly installed on both sides of the linkage frame.

[0013] The linkage frame is evenly provided with making way grooves corresponding to the liquid outlet.

[0014] An end cap is arranged at the end of the linkage cylinder away from the valve body.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the hydraulic valve for hydraulic transmission:

[0016] 1. When the liquid flows into the liquid inlet channel through the liquid inlet, the pressure of the liquid pushes the top plug at the end of the liquid inlet channel to move, so that the top plug drives the sealing plug to move through the hydraulic linkage assembly, so that the three liquid separation channels are opened, and the liquid is diverted through the hydraulic valve, so that the liquid flow on the three liquid separation channels is the same, avoiding affecting the working environment of the hydraulic valve. According to the use scenario of the hydraulic valve, the outlet of the liquid separation channel can be selectively closed, and the sealing plug can be embedded in the liquid outlet, so that the hydraulic valve has applicability.

[0017] 2. During the use of the hydraulic valve, when a fault occurs and the liquid separation channel cannot be opened, twist the end cap at the top of the linkage cylinder. As the linkage cylinder rotates, the sealing plug and the top plug can be driven to move in opposite directions at the same time, thereby opening the liquid channel. In this way, the hydraulic valve can operate the liquid separation channel when an accident occurs.

[0018] 3. During the use of the hydraulic valve, when the sealing plug moves to open the liquid separation channel, the sealing plug drives the pushing piece to move through the sliding rod, so that the pushing piece pushes the arc-shaped end of the prompt rod. According to the length of the prompt rod extending out of the valve body, it can be judged whether the flow in each liquid separation channel is the same. When a problem occurs, the protruding length of the prompt rod in the outer cover is observed, which brings convenience to the use of the hydraulic valve.

[0019] Fourth, the sliding cooperation between the directional guide seat and the directional slide groove ensures the stability of the moving direction of the linkage frame, avoids position deviation, and thus ensures the stability of the liquid flow control process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a hydraulic valve for hydraulic transmission of the utility model. Figure Ⅰ ;

[0021] Figure 2 This is a schematic diagram of the structure of a hydraulic valve for hydraulic transmission of the utility model. Figure II ;

[0022] Figure 3 This is a structural cross-sectional view of a hydraulic valve for hydraulic transmission of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the linkage cylinder and linkage frame of the utility model;

[0024] Figure 5 It is a structural cross-sectional view of the linkage cylinder part of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the sliding rod and the prompting rod part of the utility model;

[0026] in, Figures 1 to 6 The corresponding relationship between the figure numbers and the component names is: 1-valve body, 2-liquid inlet channel, 3-liquid separation channel, 4-top plug, 5-sealing plug, 6-slide rod, 7-linkage frame, 8-bracket, 9-linkage member, 10-transmission member, 11-fixed frame, 12-linkage cylinder, 13-directional slide groove, 14-directional guide seat, 15-external thread, 16-rotation guide groove, 17-outer cover, 18-yield groove, 19-end cap, 20-driving guide block, 21-prompt rod, 22-pushing member, 23-elastic member. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The following is a combination of specific implementation cases and attached Figure 1 -Attached Figure 6 The present invention is further described below, but the present invention is not limited to these embodiments.

[0029] A hydraulic valve for hydraulic transmission includes a valve body 1, wherein a liquid inlet channel 2 extending to an inner cavity is provided at the liquid inlet of the valve body 1. A liquid inlet is provided at the bottom of the valve body 1, and a liquid inlet channel 2 is provided along the inner cavity where the liquid inlet is located, so that when the hydraulic valve is working, the liquid inlet is connected to the pipeline, so that the liquid enters the inside of the liquid inlet channel 2 through the liquid inlet. Liquid separation channels 3 connected to the liquid inlet channel 2 are evenly provided on the outer wall of the valve body 1. Three liquid outlets are fixedly embedded and installed in sequence on the top of the valve body 1, and a liquid separation channel 3 extending to the inner cavity is provided at the position where the liquid outlet is connected to the valve body 1, and the three liquid separation channels 3 are connected to the liquid inlet channel 2 at the inner cavity of the valve body 1. After the liquid passes through the liquid inlet channel 2, it is discharged from the three liquid separation channels 3 to the outside of the valve body 1 from the liquid outlet.

[0030] A top plug 4 is embedded in the inner wall at the end of the liquid inlet channel 2. The top plug 4 is embedded in the port where the liquid inlet channel 2 extends to the inner cavity of the valve body 1, and the opening and closing of the liquid inlet channel 2 is controlled by the top plug 4. The three liquid inlet channels 2 are embedded in the ports of the inner cavity of the valve body 1, and the opening and closing of each liquid separation channel 3 is controlled by the sealing plug 5. A sealing plug 5 is embedded in the inner wall at the beginning of the liquid separation channel 3. The liquid outlet is fixed on the surface of the valve body 1, that is, the liquid outlet is located at the liquid separation port at the end of the liquid separation channel 3. A hydraulic linkage assembly is arranged on the side wall where the liquid separation port of the valve body 1 is located, and the hydraulic linkage assembly drives the sealing plug 5 and the top plug 4 to move in opposite directions at the same time.

[0031] When the liquid flows into the liquid inlet channel 2 through the liquid inlet port, the top plug 4 at the end of the liquid inlet channel 2 is pushed to move by the pressure of the liquid, so that the top plug 4 drives the sealing plug 5 to move through the hydraulic linkage assembly, so that the top plug 4 and the sealing plug 5 move relative to each other, so that the three liquid separation channels 3 are opened. Thus, the liquid is diverted by the hydraulic valve, so that the liquid flow rates on the three liquid separation channels 3 are the same, avoiding the impact on the working environment of the hydraulic valve. According to the use scenario of the hydraulic valve, the outlet of the liquid separation channel 3 can be selectively closed, and the sealing plug is embedded at the liquid outlet, so that the hydraulic valve has applicability.

[0032] The hydraulic linkage assembly includes a transmission member 10 fixedly connected to the side of the top plug 4 close to the liquid separation channel 3, and the end of the transmission member 10 away from the top plug 4 penetrates the side wall of the valve body 1 and extends to the outside. One end of the transmission member 10 is vertically fixedly installed at the top center of the top plug 4, and the other end of the transmission member 10 penetrates the top of the valve body 1 and extends to the outside. The transmission member 10 can be a rod body, and the transmission member 10 slides in the through hole at the top of the valve body 1. So that the transmission member 10 drives the top plug 4 to move.

[0033] A bracket 8 is fixedly installed on the outer wall where the liquid dispensing port of the valve body 1 is located. Two brackets 8 are vertically fixed on the top of the valve body 1 in parallel with each other, and a linkage frame 7 parallel to the top of the valve body 1 fits and slides between the two brackets 8. A linkage frame 7 is slidably arranged inside the bracket 8, and each sealing plug 5 is connected to the linkage frame 7 through a linkage member 9 that penetrates the side wall of the valve body 1. The upper end of the linkage member 9 is vertically fixed to the bottom of the linkage frame 7, and the lower end of the linkage member 9 is vertically fixed to the top of the sealing plug 5. The linkage member 9 can be a rod body, and the linkage member 9 penetrates the top of the valve body 1. Each sealing plug 5 is connected to the linkage frame 7 through two linkage members 9 that are parallel to each other.

[0034] The outer wall of the valve body 1 is provided with a bidirectional linkage component that drives the transmission member 10 and the linkage frame 7 to move in opposite directions at the same time. When the liquid pushes the top plug 4 to move through the bidirectional linkage component, the linkage frame 7 simultaneously drives the sealing plug 5 to move through the linkage member 9, thereby evenly diverting the liquid through the valve body 1.

[0035] It is worth noting that the two-way linkage component includes a linkage cylinder 12 rotatably mounted on a fixed frame 11. A fixed frame 11 parallel to the surface of the valve body 1 is fixedly mounted between the two brackets 8. A through hole is longitudinally opened at a position opposite to the fixed frame 11 and the linkage cylinder 12. A bearing is embedded in the through hole. The linkage cylinder 12 is embedded in the bearing so that the linkage cylinder 12 rotates on the fixed frame 11. Figure 3For example, the side where the three liquid separation channels 3 are located is the upper end or top end, and the side where the liquid inlet channel 2 is located is the lower end or bottom end. The bottom end of the linkage cylinder 12 is provided with a rotation guide groove 16 along the inner wall spirally, and the top end of the outer wall of the transmission member 10 is provided with a driving guide block 20, and the driving guide block 20 is slidably arranged on the rotation guide groove 16, and the linkage frame 7 is threadedly connected to the outside of the linkage cylinder 12.

[0036] A threaded through hole is longitudinally provided at the position where the linkage frame 7 and the linkage cylinder 12 are opposite, so that the linkage frame 7 moves longitudinally when the linkage cylinder 12 rotates. A driving guide block 20 is fixedly installed on the outer wall of the end of the transmission member 10 outside the valve body 1, and the driving guide block 20 is embedded in the inside of the rotation guide groove 16. A partial external thread 15 is provided on the outer wall of the bottom end of the linkage cylinder 12, and is threadedly connected to the linkage frame 7 through the partial external thread 15. A spiral rotation guide groove 16 is provided upward from the bottom end of the inner wall of the linkage cylinder 12.

[0037] When the liquid flows into the liquid inlet channel 2 through the liquid inlet port, the top plug 4 at the end of the liquid inlet channel 2 is pushed to move by the pressure of the liquid, so that the top plug 4 drives the transmission member 10 to move in the vertical direction, so that the transmission member 10 drives the driving guide block 20 to slide along the inner wall of the rotating guide groove 16, and the spiral design of the rotating guide groove 16 makes the linkage cylinder 12 rotate, and as the linkage cylinder 12 rotates, the linkage frame 7 threadedly connected thereto drives the sealing plug 5 to move downward through the linkage member 9. Thus, the liquid separation channel 3 and the liquid inlet channel 2 are opened at the same time, and the liquid is diverted.

[0038] During the use of the hydraulic valve, when a fault occurs and the liquid separation channel 3 cannot be opened, the end cap 19 located at the top of the linkage cylinder 12 is twisted, and as the linkage cylinder 12 rotates, the sealing plug 5 and the top plug 4 can be driven to move in the opposite direction at the same time, thereby opening the liquid channel. This allows the hydraulic valve to operate the channel normally when an accident occurs.

[0039] In addition, one end of a slide bar 6 is provided on the side of the sealing plug 5 away from the liquid outlet, and the other end of the slide bar 6 extends to the inner cavity of the valve body 1. The top of the slide bar 6 is vertically fixed to the bottom of the sealing plug 5, and a movable groove is provided on the inner wall of the inner cavity of the valve body 1 opposite to the slide bar 6, so that the lower end of the slide bar 6 slides in the inner cavity of the movable groove. A pushing piece 22 is fixedly installed on the outer wall of the end of the slide bar 6 away from the sealing plug 5. A wedge-shaped pushing piece 22 is fixedly installed on the outer wall of the slide bar 6 located in the movable groove, and a prompt rod 21 is embedded on the side wall of the valve body 1, and the end of the prompt rod 21 located in the inner cavity of the valve body 1 is attached to the side wall of the pushing piece 22. The prompt rod 21 is movably embedded on the outer wall of the valve body 1 perpendicular to the liquid inlet channel 2, and the end of the prompt rod 21 located in the inner cavity of the valve body 1 is located in an arc. And the arc-shaped end of the prompt rod 21 is attached to the inclined surface of the pushing piece 22.

[0040] The outer cover of the prompt rod 21 is provided with an outer cover 17 fixed to the side wall of the valve body 1, and the outer cover 17 and the prompt rod 21 are connected by an elastic member 23, the elastic member 23 can be a compression spring, and the two ends of the elastic member 23 are respectively fixed at the relative positions of the outer cover 17 and the prompt rod 21. The outer cover 17 is fixed to the surface of the valve body 1 by bolts.

[0041] During the use of the hydraulic valve, when the sealing plug 5 moves to open the liquid separation channel 3, the sealing plug 5 drives the pushing piece 22 to move through the sliding rod 6, so that the pushing piece 22 pushes the arc-shaped end of the prompt rod 21. According to the length of the prompt rod 21 extending out of the valve body 1, it can be judged whether the flow rates in each liquid separation channel 3 are the same. When a problem occurs, the protruding length of the prompt rod 21 in the outer cover 17 is observed, thereby bringing convenience to the use of the hydraulic valve.

[0042] In addition, the outer cover 17 is made of transparent material. The outer cover 17 made of colorless and transparent material can more clearly understand the length of the prompt rod 21 protruding from the outside of the valve body 1. Therefore, the displacement distance of the sealing plug 5 can be understood, and the problem position affecting the liquid flow can be determined according to the position of the sealing plug 5.

[0043] Furthermore, a directional sliding groove 13 is formed on the inner wall of the bracket 8 , and directional guide seats 14 slidably arranged inside the directional sliding groove 13 are fixedly mounted on both sides of the linkage frame 7 .

[0044] The sliding cooperation between the directional guide seat 14 and the directional slide groove 13 ensures the stability of the moving direction of the linkage frame 7 and avoids position deviation, thereby ensuring the stability of the liquid flow control process.

[0045] The linkage frame 7 is evenly provided with a clearance groove 18 relative to the liquid outlet. The clearance groove 18 is longitudinally provided on the fixed frame 11 and the linkage frame 7 to ensure that the liquid outlet is not interfered when docking.

[0046] The end of the linkage cylinder 12 away from the valve body 1 is provided with an end cap 19. The end cap 19 is threadedly connected to the linkage cylinder 12, and the end cap 19 seals the linkage cylinder 12. At the same time, the end cap 19 can also drive the linkage cylinder 12 to rotate, thereby manually controlling the opening and closing of the hydraulic valve.

[0047] The present embodiment is a hydraulic valve for hydraulic transmission, and its working principle is as follows: when liquid flows into the liquid inlet channel 2 through the liquid inlet port, the top plug 4 at the end of the liquid inlet channel 2 is pushed to move by the pressure of the liquid, so that the top plug 4 drives the transmission member 10 to move in the vertical direction, so that the transmission member 10 drives the driving guide block 20 to slide along the inner wall of the rotating guide groove 16, and the spiral design of the rotating guide groove 16 makes the linkage cylinder member 12 rotate. As the linkage cylinder member 12 rotates, the linkage frame 7 threadedly connected to it drives the sealing plug 5 to move downward through the linkage member 9, thereby opening the liquid separation channel 3 and the liquid inlet channel 2 at the same time.

[0048] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0050] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic valve for hydraulic transmission, comprising a valve body (1), characterized in that: A liquid inlet channel (2) extending to the inner cavity is provided at the liquid inlet of the valve body (1); liquid separation channels (3) are evenly provided on the outer wall of the valve body (1); the liquid inlet channel (2) and the liquid separation channel (3) are connected through the inner cavity of the valve body (1); a top plug (4) is embedded in the inner wall at the end of the liquid inlet channel (2); a sealing plug (5) is embedded in the inner wall at the beginning of the liquid separation channel (3); a hydraulic linkage component is provided on the side wall where the liquid separation port of the valve body (1) is located, and the hydraulic linkage component drives the sealing plug (5) and the top plug (4) to move in opposite directions at the same time.

2. A hydraulic valve for hydraulic transmission according to claim 1, characterized in that: The hydraulic linkage assembly comprises a transmission member (10) fixedly connected to a side of the top plug (4) close to the liquid separation channel (3), and an end of the transmission member (10) away from the top plug (4) penetrates the side wall of the valve body (1) and extends to the outside, a bracket (8) is fixedly installed on the outer wall where the liquid separation port of the valve body (1) is located, a fixed frame (11) is fixedly installed inside the bracket (8), a linkage frame (7) is slidably arranged inside the bracket (8), and each of the sealing plugs (5) is connected to the linkage frame (7) via a linkage member (9) penetrating the side wall of the valve body (1), and a bidirectional linkage component is arranged on the outer wall of the valve body (1) to drive the transmission member (10) and the linkage frame (7) to move in opposite directions at the same time.

3. A hydraulic valve for hydraulic transmission according to claim 2, characterized in that: The bidirectional linkage component comprises a linkage cylinder (12) rotatably arranged on the fixed frame (11); a rotation guide groove (16) is spirally opened at the bottom end of the linkage cylinder (12) along the inner wall; a driving guide block (20) is arranged at the top end of the outer wall of the transmission member (10), and the driving guide block (20) is slidably arranged on the rotation guide groove (16); and the linkage frame (7) is threadedly connected to the outside of the linkage cylinder (12).

4. A hydraulic valve for hydraulic transmission according to claim 3, characterized in that: One end of a sliding rod (6) is provided on a side of the sealing plug (5) away from the liquid outlet, and the other end of the sliding rod (6) extends to the inner cavity of the valve body (1). A pushing piece (22) is fixedly mounted on the outer wall of the end of the sliding rod (6) away from the sealing plug (5). A prompt rod (21) is embedded on the side wall of the valve body (1), and the end of the prompt rod (21) located in the inner cavity of the valve body (1) is attached to the side wall of the pushing piece (22). The outer cover of the prompt rod (21) is provided with an outer cover (17) fixedly connected to the side wall of the valve body (1), and the outer cover (17) and the prompt rod (21) are connected via an elastic piece (23).

5. A hydraulic valve for hydraulic transmission according to claim 4, characterized in that: The outer cover (17) is made of a transparent material.

6. A hydraulic valve for hydraulic transmission according to claim 2, characterized in that: The inner wall of the bracket (8) is provided with a directional sliding groove (13), and directional guide seats (14) slidably arranged inside the directional sliding groove (13) are fixedly mounted on both sides of the linkage frame (7).

7. A hydraulic valve for hydraulic transmission according to claim 2, characterized in that: The linkage frame (7) is evenly provided with clearance grooves (18) opposite to the liquid outlet.

8. The hydraulic valve for hydraulic transmission according to claim 3, characterized in that: An end cap (19) is provided at the end of the linkage cylinder (12) away from the valve body (1).

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