Liquid level meter self-closing valve for steering engine and liquid level meter

Abstract

The utility model relates to a liquidometer self-closing valve for a steering engine, and belongs to the technical field of liquidometers, the liquidometer self-closing valve comprises a valve body and a valve rod, the valve rod penetrates through the valve body, one end of the valve rod is connected with a pressing cap, the pressing cap is connected with a reset spring, the reset spring is connected with the valve body, and the end, away from the pressing cap, of the valve body is a liquid inlet end; a first sealing assembly and a second sealing assembly are arranged on the valve rod, the first sealing assembly is used for limiting liquid from flowing out of the end, provided with the pressing cap, of the valve body, the second sealing assembly can seal the liquid inlet end of the valve body, and a liquid inlet channel is formed in the valve body. A flowing cavity allowing liquid to flow is reserved between the rod section, located between the first sealing assembly and the second sealing assembly, of the valve rod and the valve body channel, the flowing cavity is communicated with the liquid inlet channel, and during liquid inlet, the valve rod drives the second sealing assembly to be separated from the valve body. The liquid level meter has the advantages that the liquid level meter can be communicated with the steering engine oil tank when the liquid level is observed, and the liquid level meter is separated from the steering engine hydraulic oil tank at ordinary times.

Description

Technical Field

[0001] The present application relates to the technical field of liquid level gauges, and in particular to a push-type liquid level gauge for a steering gear. Background Art

[0002] A marine steering gear is a device used to control the direction of a ship, usually including a hydraulic system, which is used to adjust the angle of the rudder to change the course of the ship. Marine steering gear systems are crucial in the maritime and shipping fields to ensure that ships can navigate safely and accurately. Hydraulic steering gears use hydraulic oil during operation, and the hydraulic oil will be lost during use. Therefore, it is necessary to regularly check and replenish the hydraulic oil to ensure the normal operation and life of the system. The usual way to check the hydraulic oil is to install a level gauge connected to its oil tank on the outer wall of the steering gear. Most level gauges are generally made of glass for easy observation, and glass products are easy to break. Once the existing level gauge is broken, the oil inside the steering gear will leak out and it is difficult to seal. Utility Model Content

[0003] In order to enable the liquid level gauge to be connected to the steering gear oil tank when observing the liquid level, the liquid level gauge is separated from the steering gear hydraulic oil tank at normal times to avoid a large amount of hydraulic oil leakage in the steering gear oil tank when the liquid level gauge leaks, the present application provides a self-closing valve and a liquid level gauge for a steering gear liquid level gauge.

[0004] The present application provides a self-closing valve for a liquid level gauge for a steering gear, which adopts the following technical solution:

[0005] A self-closing valve for a liquid level gauge for a steering gear comprises a valve body and a valve stem, the valve stem passes through the valve body, one end of the valve stem is connected to a push cap, the push cap is connected to a return spring, the return spring is connected to the valve body, the end of the valve body away from the push cap is a liquid inlet end, the valve stem is provided with a first sealing component and a second sealing component, the first sealing component is used to limit the outflow of liquid from the end of the valve body provided with the push cap, the second sealing component can close the liquid inlet end of the valve body, the valve body is provided with a liquid inlet channel, the anchor rod is located between the first sealing component and the second sealing component, and a flow cavity for liquid flow is reserved between the rod section and the valve body channel, the flow cavity is communicated with the liquid inlet channel, when liquid is inlet, the valve stem drives the second sealing component to separate from the valve body.

[0006] By adopting the above technical solution, the liquid inlet end of the valve body is inserted into the steering gear oil tank, and the liquid inlet of the existing liquid level gauge is connected to the liquid inlet channel. When the oil level in the steering gear oil tank needs to be observed, the pressing cap is pressed, and the pressing cap drives the valve stem to move in the direction of extending into the steering gear oil tank. At this time, the reset spring is in a compressed state, and the valve stem drives the second sealing component to separate from the valve body, and the hydraulic oil flows from the liquid inlet end of the valve stem into the flow cavity. Since the first sealing component blocks one end of the valve body provided with the pressing cap, the hydraulic oil can only flow from the flow cavity to the liquid inlet channel, and then discharged into the liquid level gauge. When the liquid level of the hydraulic oil in the liquid level gauge no longer rises, the amount of hydraulic oil in the steering gear oil tank can be read. Finally, the pressing cap is released, the reset spring drives the pressing cap to reset, and the valve stem drives the second sealing component to re-close the liquid inlet end of the valve body.

[0007] Thereby, the liquid level gauge can be connected to the steering gear oil tank when observing the liquid level, and the liquid level gauge is separated from the steering gear hydraulic oil tank at ordinary times, so as to avoid the situation that a large amount of hydraulic oil in the steering gear oil tank leaks when the liquid level gauge leaks.

[0008] Optionally, the first sealing assembly includes a first sealing ring, the first sealing ring is arranged on the valve stem, the first sealing ring is in contact with the inner wall of the valve body, and the valve stem is provided with a first limiting member for limiting the relative displacement between the first sealing ring and the valve stem;

[0009] The second sealing assembly includes a second sealing ring, which is arranged on the valve stem and fits against the inner wall of the valve body. The valve stem is provided with a second limiting member for limiting the relative displacement between the second sealing ring and the valve stem.

[0010] By adopting the above technical solution, the first sealing ring limits the liquid from flowing out from one end of the valve body adjacent to the pressing cap, the second sealing ring cooperates with the valve stem to open or close the liquid inlet end of the valve body, the first limiting member keeps the first sealing ring and the valve stem relatively still, and the second limiting member keeps the second sealing ring and the valve stem relatively still, thereby avoiding the relative displacement of the first sealing ring, the second sealing ring and the valve stem when the valve stem moves, causing the first sealing ring and the second sealing ring to move to the liquid outlet channel or detach from one end of the valve sleeve, resulting in loss of sealing effect.

[0011] Optionally, the first limiting member includes a first limiting sleeve and a second limiting sleeve, the first limiting sleeve and the second limiting sleeve are both sleeved and fixed on the valve stem, and the first sealing ring is located between the first limiting sleeve and the second limiting sleeve and fits with the first limiting sleeve and the second limiting sleeve;

[0012] The second limiting member includes a third limiting sleeve and a fourth limiting sleeve, the third limiting sleeve and the fourth limiting sleeve are both sleeved and fixed on the valve stem, and the second sealing ring is located between the third limiting sleeve and the fourth limiting sleeve and fits with the third limiting sleeve and the fourth limiting sleeve.

[0013] Optionally, the first limit sleeve, the second limit sleeve, the third limit sleeve and the fourth limit sleeve are all slidably mounted on the valve stem, a positioning spring is mounted on the valve stem, the positioning spring is located between the second limit sleeve and the third limit sleeve, and abuts against the second limit sleeve and the third limit sleeve, and one end of the valve stem extending out of the liquid inlet end of the valve body is threadedly connected with a fixing nut, so the fixing nut abuts against the fourth limit sleeve, and the first limit sleeve abuts against the pressing cap.

[0014] By adopting the above technical solution, the pressing cap is pressed, and the pressing cap drives the valve stem to move in the direction of extending into the steering gear oil tank. At the same time, the pressing cap pushes the first limiting sleeve, the first limiting sleeve pushes the first sealing ring, and the first sealing ring pushes the second limiting sleeve. Since the distance that the pressing cap drives the valve stem to move is the same as the distance that the first limiting sleeve moves, the first sealing ring and the valve stem remain relatively stationary.

[0015] The second limit sleeve presses against the positioning spring, and the positioning spring only generates a force but does not deform. The positioning spring pushes the third limit sleeve to move, and the third limit sleeve presses against the second sealing ring. The second sealing ring presses against the fourth limit sleeve, and the fixing nut limits the movement of the fourth limit sleeve, so the second sealing ring and the valve stem remain relatively stationary.

[0016] Loosen the push cap, the reset spring drives the push cap to reset, the push cap pulls the valve stem to reset, the fixed nut pushes the fourth limit sleeve, and the fourth limit sleeve pushes the second sealing ring. The second sealing ring pushes the third limit sleeve, and the third limit sleeve pushes the positioning spring, the second limit sleeve, the first sealing ring, and the first limit sleeve to move in sequence, so that the first sealing ring and the second sealing ring remain relatively still when the valve body is reset. This design does not require the first limit sleeve, the second limit sleeve, the third limit sleeve, and the fourth limit sleeve to be reinforced by a fixing process, which is convenient for on-site installation and assembly.

[0017] Optionally, a guide channel is provided at the liquid inlet end of the valve body, and the guide channel is a frustoconical channel. The guide channel is connected to the flow cavity, and the minimum inner diameter of the guide channel is the same as the inner diameter of the flow cavity.

[0018] By adopting the above technical solution, the guide channel ensures that the second sealing ring can be smoothly retracted into the valve body after extending out of the valve body, thereby reducing the situation where the second sealing ring is slightly bent and deformed at the end of the valve stem after extending out of the valve body, resulting in the second sealing ring being stuck on the end face of the valve body after the valve stem is retracted.

[0019] Optionally, the outer diameter of one end of the valve body away from the liquid inlet end thereof is larger than the outer diameter of the liquid inlet end of the valve body, and a third sealing ring is sleeved on the valve body, and the third sealing ring fits against the stepped surface of the valve body.

[0020] By adopting the above technical solution, when the valve body is installed by passing through the liquid level gauge, the stepped surface can cooperate with the third sealing ring to fit the liquid level gauge, thereby enhancing the sealing effect of the connection between the liquid level gauge and the valve body.

[0021] Optionally, the pressing cap is provided with a fixing hole, the fixing hole is threadedly connected to one end of the valve body, and thread glue is injected into the fixing hole.

[0022] The present application provides a steering gear liquid level gauge adopting the following technical solution:

[0023] A liquid level gauge for a steering gear, using the above-mentioned self-closing valve for the liquid level gauge for the steering gear, comprising an observation shell, the observation shell is connected to the steering gear oil tank, the observation shell is provided with an insertion port, the valve body passes through the observation shell through the insertion port and is inserted into the steering gear oil tank, the observation shell is provided with a sealing groove, the sealing groove is circumferentially arranged and connected along the insertion port, the third sealing ring is located in the sealing groove, and the stepped surface of the valve body abuts against the side of the observation shell facing away from the steering gear oil tank.

[0024] By adopting the above technical scheme, the observation shell is first connected to the steering gear oil tank, and then the valve body is inserted into the observation shell and the steering gear oil tank. The valve body is connected to the observation shell and the steering gear oil tank at the same time, which enhances the stability of the connection between the observation shell and the steering gear oil tank. The third sealing ring cooperates with the stepped surface of the valve body and the observation shell, thereby improving the sealing of the connection between the valve body and the observation shell.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The level gauge can be connected to the steering gear oil tank when observing the liquid level. The level gauge is usually separated from the steering gear hydraulic oil tank to avoid the situation where a large amount of hydraulic oil in the steering gear oil tank leaks when the level gauge leaks;

[0027] 2. It is not necessary to use a fixing process to reinforce the first limiting sleeve, the second limiting sleeve, the third limiting sleeve and the fourth limiting sleeve, which is convenient for on-site installation and assembly;

[0028] 3. The valve body is connected to the observation housing and the steering gear oil tank at the same time, which strengthens the stability of the connection between the observation housing and the steering gear oil tank, and the third sealing ring cooperates with the stepped surface of the valve body and the observation housing to improve the sealing of the connection between the valve body and the observation housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0030] Explanation of the accompanying drawings: 1. valve body; 11. sliding channel; 12. flow channel; 13. guide channel; 14. third sealing ring; 15. liquid inlet channel; 2. valve stem; 21. fixing nut; 3. first sealing assembly; 31. first sealing ring; 32. first limiting piece; 321. first limiting sleeve; 322. second limiting sleeve; 4. second sealing assembly; 41. second sealing ring; 42. second limiting piece; 421. third limiting sleeve; 422. fourth limiting sleeve; 5. reset spring; 6. pressing cap; 61. fixing hole; 62. threaded glue; 7. flow chamber; 8. positioning spring; 9. observation shell; 91. insertion port; 92. sealing groove. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 This application is described in further detail.

[0032] The embodiment of the present application discloses a self-closing valve for a liquid level gauge used in a steering gear.

[0033] like Figure 1 The self-closing valve of the liquid level gauge for the steering gear comprises a valve body 1 and a valve stem 2. One end of the valve body 1 is a hexagonal column, and the other end of the valve body 1 is a cylindrical body. The radius of the circumscribed circle of one end of the valve body 1 is greater than the radius of the other end of the valve body 1. The end of the valve body 1 with a small radius is the liquid inlet end. The inside of the valve body 1 is provided with a sliding channel 11, a flow channel 12 and a guide channel 13 in sequence in the direction close to the liquid inlet end. The sliding channel 11, the flow channel 12 and the guide channel 13 are coaxially arranged with the valve body 1. The inner diameter of the sliding channel 11 is greater than the inner diameter of the flow channel 12. The guide channel 13 is a truncated cone channel. The guide channel 13 is connected with the flow channel 12, and the minimum inner diameter of the guide channel 13 is the same as the inner diameter of the flow channel 12. A third sealing ring 14 is sleeved at the variable cross-section of the valve body 1. A liquid inlet channel 15 is provided in the middle section of the valve body 1. The liquid inlet channel 15 passes through the circumference of the valve body 1 and is connected with the flow channel 12.

[0034] The valve stem 2 passes through the valve body 1. A first sealing component 3 is provided near the third sealing ring 14 of the valve stem 2. A second sealing component 4 is provided near the liquid inlet end of the valve body 1. A return spring 5 is provided in the sliding channel 11. The return spring 5 is fixed on the stepped surface of the sliding channel 11 and the flow channel 12. The return spring 5 is sleeved on the valve stem 2. The return spring 5 is connected to a pressing cap 6. A fixing hole 61 is provided at the center of the pressing cap 6. The end of the valve body 1 is threadedly connected to the fixing hole 61, and a thread glue 62 is injected into the fixing hole 61. The stem section of the valve stem 2 located between the first sealing component 3 and the second sealing component 4 and the inner wall of the flow channel 12 together enclose a flow cavity 7, and the flow cavity 7 is connected to the liquid inlet channel 15.

[0035] Insert the liquid inlet end of the valve body 1 into the steering gear oil tank, connect the liquid inlet of the existing liquid level gauge with the liquid inlet channel 15, and when the oil level in the steering gear oil tank needs to be observed, press the pressing cap 6, and the pressing cap 6 drives the valve stem 2 to move in the direction of extending into the steering gear oil tank. At this time, the reset spring 5 is in a compressed state, and the valve stem 2 drives the second sealing component 4 to separate from the valve body 1, and the hydraulic oil flows from the liquid inlet end of the valve stem 2 into the flow chamber 7. Since the first sealing component 3 blocks one end of the valve body 1 provided with the pressing cap 6, the hydraulic oil can only flow from the flow chamber 7 to the liquid inlet channel 15, and then discharge into the liquid level gauge. When the liquid level of the hydraulic oil in the liquid level gauge no longer rises, the amount of hydraulic oil in the steering gear oil tank can be read. Finally, release the pressing cap 6, the reset spring 5 drives the pressing cap 6 to reset, and the valve stem 2 drives the second sealing component 4 to re-close the liquid inlet end of the valve body 1.

[0036] Thereby, the liquid level gauge can be connected to the steering gear oil tank when observing the liquid level, and the liquid level gauge is separated from the steering gear hydraulic oil tank at ordinary times, so as to avoid the situation that a large amount of hydraulic oil in the steering gear oil tank leaks when the liquid level gauge leaks.

[0037] like Figure 1 The first sealing assembly 3 includes a first sealing ring 31, which is sleeved and fastened on the valve stem 2, and the first sealing ring 31 is in contact with the inner wall of the valve body 1. The valve stem 2 is provided with a first stopper 32 for limiting the relative displacement between the first sealing ring 31 and the valve stem 2;

[0038] The second sealing assembly 4 includes a second sealing ring 41, which is sleeved and fastened on the valve stem 2. The second sealing ring 41 fits the inner wall of the valve body 1, and the valve stem 2 is provided with a second limiter 42 for limiting the relative displacement between the second sealing ring 41 and the valve stem 2.

[0039] In the embodiment of the present application, the first limiting member 32 includes a first limiting sleeve 321 and a second limiting sleeve 322, both of which are sliding sleeves arranged on the valve stem 2, the second limiting member 42 includes a third limiting sleeve 421 and a fourth limiting sleeve 422, both of which are sliding sleeves arranged on the valve stem 2, the first sealing ring 31 is located between the first limiting sleeve 321 and the second limiting sleeve 322, and the first sealing ring 31 is fitted with the first limiting sleeve 321 and the second limiting sleeve 322, the second sealing ring 41 is located between the third limiting sleeve 421 and the fourth limiting sleeve 422, and the second sealing ring 41 is fitted with the third limiting sleeve 421 and the fourth limiting sleeve 422. The first limiting sleeve 321 extends into the sliding channel 11 and abuts against the pressing cap 6, a positioning spring 8 is connected between the second limiting sleeve 322 and the third limiting sleeve 421, and one end of the valve stem 2 extending out of the liquid inlet end is threadedly connected with a fixing nut 21, and the fixing nut 21 is tightly abutted against the fourth limiting sleeve 422.

[0040] The pressing cap 6 is pressed, and the pressing cap 6 drives the valve stem 2 to move in the direction of extending into the steering gear oil tank. At the same time, the pressing cap 6 pushes the first limiting sleeve 321, and the first limiting sleeve 321 pushes the first sealing ring 31, and the first sealing ring 31 pushes the second limiting sleeve 322. Since the distance that the pressing cap 6 drives the valve stem 2 to move is the same as the distance that the first limiting sleeve 321 moves, the first sealing ring 31 and the valve stem 2 remain relatively stationary.

[0041] The second limiting sleeve 322 presses against the positioning spring 8, and the positioning spring 8 only generates a force but does not deform. The positioning spring 8 pushes the third limiting sleeve 421 to move, and the third limiting sleeve 421 presses against the second sealing ring 41. The second sealing ring 41 presses against the fourth limiting sleeve 422. The fixing nut 21 limits the movement of the fourth limiting sleeve 422, so the second sealing ring 41 and the valve stem 2 remain relatively stationary.

[0042] When the pressing cap 6 is released, the reset spring 5 drives the pressing cap 6 to reset, and the pressing cap 6 pulls the valve stem 2 to reset, and the fixing nut 21 pushes the fourth limiting sleeve 422, and the fourth limiting sleeve 422 pushes the second sealing ring 41. The second sealing ring 41 pushes the third limiting sleeve 421, and the third limiting sleeve 421 then pushes the positioning spring 8, the second limiting sleeve 322, the first sealing ring 31, and the first limiting sleeve 321 to move in sequence, so that the first sealing ring 31 and the second sealing ring 41 also remain relatively still when the valve body 1 is reset, thereby preventing the first sealing ring 31, the second sealing ring 41 and the valve stem 2 from being relatively displaced when the valve stem 2 moves, so that the first sealing ring 31 and the second sealing ring 41 move to the liquid inlet channel 15 or detach from one end of the valve body 1, resulting in a loss of sealing effect.

[0043] In other embodiments, the first limiting sleeve 321, the second limiting sleeve 322, the third limiting sleeve 421 and the fourth limiting sleeve 422 may be directly fixed to the valve stem 2. The first limiting member 32 and the second limiting member 42 may also be annular grooves provided on the valve stem 2, and the first sealing ring 31 and the second sealing ring 41 are inserted into the corresponding annular grooves.

[0044] The implementation principle of the embodiment of the present application is as follows: insert the liquid inlet end of the valve body 1 into the steering gear oil tank, connect the liquid inlet of the existing liquid level gauge with the liquid inlet channel 15, and when it is necessary to observe the oil level in the steering gear oil tank, press the pressing cap 6, and the pressing cap 6 drives the valve stem 2 to move in the direction of extending into the steering gear oil tank. At this time, the reset spring 5 is in a compressed state, and the valve stem 2 drives the second sealing component 4 to separate from the valve body 1, and the hydraulic oil flows from the liquid inlet end of the valve stem 2 into the flow chamber 7. Since the first sealing component 3 blocks one end of the valve body 1 provided with the pressing cap 6, the hydraulic oil can only flow from the flow chamber 7 to the liquid inlet channel 15, and then discharge into the liquid level gauge. When the liquid level of the hydraulic oil in the liquid level gauge no longer rises, the amount of hydraulic oil in the steering gear oil tank can be read. Finally, release the pressing cap 6, the reset spring 5 drives the pressing cap 6 to reset, and the valve stem 2 drives the second sealing component 4 to re-close the liquid inlet end of the valve body 1.

[0045] Thereby, the liquid level gauge can be connected to the steering gear oil tank when observing the liquid level, and the liquid level gauge is separated from the steering gear hydraulic oil tank at ordinary times, so as to avoid the situation that a large amount of hydraulic oil in the steering gear oil tank leaks when the liquid level gauge leaks.

[0046] The embodiment of the present application also discloses a liquid level gauge for a steering gear, and the self-closing valve of the liquid level gauge for the steering gear using the embodiment of the present application includes an observation shell 9, which is connected to the steering gear oil tank. An insertion port 91 is provided on the side of the observation shell 9 away from the steering gear oil tank, and the insertion port 91 is coaxial with the oil port of the steering gear oil tank. The valve body 1 passes through the observation shell 9 through the insertion port 91 and is inserted into the steering gear oil tank. The valve body 1 is threadedly connected to the oil port of the steering gear oil tank, and a sealing groove 92 is provided on the observation shell 9. The sealing groove 92 is circumferentially opened and connected along the insertion port 91. The third sealing ring 14 is located in the sealing groove 92, and the stepped surface of the valve body 1 abuts against the side of the observation shell 9 away from the steering gear oil tank.

[0047] The observation shell 9 is first connected to the steering gear oil tank, and then the valve body 1 is inserted into the observation shell 9 and the steering gear oil tank. The valve body 1 is connected to the observation shell 9 and the steering gear oil tank at the same time, which enhances the stability of the connection between the observation shell 9 and the steering gear oil tank, and the third sealing ring 14 cooperates with the stepped surface of the valve body 1 and the observation shell 9, thereby improving the sealing of the connection between the valve body 1 and the observation shell 9.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A self-closing valve for a liquid level gauge for a steering gear, characterized in that: The invention comprises a valve body (1) and a valve stem (2), wherein the valve stem (2) passes through the valve body (1), one end of the valve stem (2) is connected to a pressing cap (6), the pressing cap (6) is connected to a return spring (5), the return spring (5) is connected to the valve body (1), the end of the valve body (1) away from the pressing cap (6) is a liquid inlet end, and the valve stem (2) is provided with a first sealing component (3) and a second sealing component (4), wherein the first sealing component (3) is used to limit the flow of liquid from the valve body (1) to the liquid inlet end. The second sealing component (4) can seal the liquid inlet end of the valve body (1), and the valve body (1) is provided with a liquid inlet channel (15). The valve stem (2) is located between the first sealing component (3) and the second sealing component (4), and a flow cavity (7) for liquid flow is left between the stem section and the valve body (1) channel. The flow cavity (7) is connected to the liquid inlet channel (15). When liquid is introduced, the valve stem (2) drives the second sealing component (4) to separate from the valve body (1).

2. The self-closing valve for a liquid level gauge for a steering gear according to claim 1, characterized in that: The first sealing assembly (3) comprises a first sealing ring (31), the first sealing ring (31) being arranged on the valve stem (2), the first sealing ring (31) being in contact with the inner wall of the valve body (1), and the valve stem (2) being provided with a first limiting member (32) for limiting relative displacement between the first sealing ring (31) and the valve stem (2); The second sealing assembly (4) comprises a second sealing ring (41), the second sealing ring (41) being arranged on the valve stem (2), the second sealing ring (41) being in contact with the inner wall of the valve body (1), and the valve stem (2) being provided with a second limiting member (42) for limiting relative displacement between the second sealing ring (41) and the valve stem (2).

3. The self-closing valve for a liquid level gauge for a steering gear according to claim 2, characterized in that: The first limiting member (32) comprises a first limiting sleeve (321) and a second limiting sleeve (322); the first limiting sleeve (321) and the second limiting sleeve (322) are both sleeved and fixed on the valve stem (2); the first sealing ring (31) is located between the first limiting sleeve (321) and the second limiting sleeve (322), and fits the first limiting sleeve (321) and the second limiting sleeve (322); The second limiting member (42) comprises a third limiting sleeve (421) and a fourth limiting sleeve (422), wherein the third limiting sleeve (421) and the fourth limiting sleeve (422) are both sleeved and fixed on the valve stem (2), and the second sealing ring (41) is located between the third limiting sleeve (421) and the fourth limiting sleeve (422), and fits the third limiting sleeve (421) and the fourth limiting sleeve (422).

4. The self-closing valve for a liquid level gauge for a steering gear according to claim 3, characterized in that: The first limiting sleeve (321), the second limiting sleeve (322), the third limiting sleeve (421) and the fourth limiting sleeve (422) are all slidably sleeved on the valve stem (2); a positioning spring (8) is sleeved on the valve stem (2); the positioning spring (8) is located between the second limiting sleeve (322) and the third limiting sleeve (421), and is in contact with the second limiting sleeve (322) and the third limiting sleeve (421); one end of the valve stem (2) extending out of the liquid inlet end of the valve body (1) is threadedly connected with a fixing nut (21), so that the fixing nut (21) is in contact with the fourth limiting sleeve (422), and the first limiting sleeve (321) is in contact with the pressing cap (6).

5. The self-closing valve for a liquid level gauge for a steering gear according to claim 2, characterized in that: The liquid inlet end of the valve body (1) is provided with a guide channel (13), the guide channel (13) is a truncated cone-shaped channel, the guide channel (13) is connected to the flow chamber (7), and the minimum inner diameter of the guide channel (13) is the same as the inner diameter of the flow chamber (7).

6. The self-closing valve for a liquid level gauge for a steering gear according to claim 1, characterized in that: The outer diameter of one end of the valve body (1) away from the liquid inlet end thereof is larger than the outer diameter of the liquid inlet end of the valve body (1); a third sealing ring (14) is sleeved on the valve body (1); the third sealing ring (14) is in contact with the stepped surface of the valve body (1).

7. The self-closing valve for a liquid level gauge for a steering gear according to claim 1, characterized in that: The pressing cap (6) is provided with a fixing hole (61), the fixing hole (61) is threadedly connected to one end of the valve body (1), and thread glue (62) is injected into the fixing hole (61).

8. A liquid level gauge for a steering gear, characterized in that: The self-closing valve of the liquid level gauge for the steering gear as claimed in claim 6 comprises an observation shell (9), wherein the observation shell (9) is connected to the steering gear oil tank, the observation shell (9) is provided with an insertion port (91), the valve body (1) passes through the observation shell (9) through the insertion port (91) and is inserted into the steering gear oil tank, the observation shell (9) is provided with a sealing groove (92), the sealing groove (92) is arranged circumferentially along the insertion port (91) and is connected, the third sealing ring (14) is located in the sealing groove (92), and the stepped surface of the valve body (1) abuts against the side of the observation shell (9) facing away from the steering gear oil tank.

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