Urea valve

Abstract

This utility model discloses a urea valve, including a urea valve body, a quick external connection mechanism, a connection stabilization mechanism, and a stabilization auxiliary mechanism. The quick external connection mechanism includes an outer fixed sleeve and a quick-clamp tube. The connection stabilization mechanism includes an outer rotating bracket and an extension bracket. The stabilization auxiliary mechanism includes an outer rotating sleeve and a rubber ring. The quick external connection mechanism achieves quick connection and disassembly of the urea valve through the plug-in design of the outer fixed sleeve and the quick-clamp tube. The double sealing design of the sealing ring and the encryption ring effectively prevents fluid leakage. The cooperation between the directional block and the directional groove ensures the correct connection direction and prevents incorrect installation. The connection stabilization mechanism adopts a mechanical locking design of the extension bracket and the embedded groove, which achieves automatic locking under the elastic force of the extension spring. The allowance groove allows the extension bracket to slide slightly longitudinally, providing adaptive adjustment space. The rotation unlocking design of the outer rotating bracket facilitates quick disassembly.

Description

Technical Field

[0001] This utility model relates to the field of valve body technology, and more specifically, to urea valves. Background Technology

[0002] In existing technologies, urea valve designs often suffer from inconvenient connection and disassembly. As a key component in the emission system, the urea valve typically requires frequent connection and disassembly with external components, such as interfaces with urea tanks and supply pipelines. Due to the relatively simple or imprecise interface structures of existing urea valves, numerous operational steps are required during connection. Furthermore, improper operation during disassembly can lead to decreased sealing performance or interface damage, increasing maintenance difficulty and time costs.

[0003] In addition, the existing urea valve connection methods are usually relatively simple, and the sealing measures used may not be sufficient to ensure the firmness and sealing of the interface. During the connection process, there may be problems such as aging of the sealing ring and uneven compression, which may cause urea liquid to leak at the valve interface. Leakage not only affects the working efficiency of the urea system, but may also cause environmental pollution and even safety hazards. The simple connection structure is also easy to loosen due to vibration or external impact, thereby increasing the risk of leakage. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a urea valve to solve the technical problems mentioned in the background art, such as the inconvenience of connecting and disassembling the urea valve to the outside world, and the easy leakage due to simple connection.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a urea valve, comprising a urea valve body, a quick external connection mechanism, a connection stabilization mechanism, and a stabilization auxiliary mechanism. The quick external connection mechanism includes an outer fixed sleeve and a quick-clamp tube. The outer fixed sleeve is fixedly installed at the outlet and inlet ends of the urea valve body. The quick-clamp tube can be directionally extended into the outer fixed sleeve. A sealing ring is installed on the inner wall of the outer fixed sleeve, and the side wall of the quick-clamp tube can be pressed against the sealing ring. The connection stabilization mechanism includes an outer rotating frame and an extension frame. The outer rotating frame is rotatably mounted on the outer wall of the outer fixed sleeve and has a groove. The extension frame is laterally slidably mounted on the outer wall of the outer fixed sleeve. An extension spring is installed between the extension frame and the outer wall of the outer fixed sleeve. An embedding groove is opened on the outer wall of the quick-clamp tube, and the extension spring can pull the extension frame into the embedding groove, so that the quick-clamp tube is stably connected to the outer fixed sleeve. A margin groove is opened on the outer wall of the outer fixed sleeve, and the extension frame is slightly longitudinally slidable within the margin groove.

[0008] The present invention is further configured such that the stabilizing auxiliary mechanism includes an outer rotating sleeve and a rubber ring. The outer rotating sleeve is rotatably mounted on the outer wall of the outer fixed sleeve. A rotary push plate is installed at the top end of the outer rotating sleeve. A push plate is longitudinally slidably mounted on the outer wall of the outer fixed sleeve, and the rubber ring is installed at the top end of the push plate. The rotation of the rotary push plate causes the push plate to longitudinally push the rubber ring against the bottom of the extension frame, causing the extension frame to move slightly longitudinally, and causing the outer wall of the quick-clamp tube to press against the sealing ring.

[0009] The present invention is further configured such that a connecting plate is installed at one end of the quick-clamp tube, and the connecting plate is connected to an external tube body, thereby facilitating system integration.

[0010] The present invention is further configured such that an directional groove is provided on the outer wall of the quick-clamp tube, and an directional block is installed on the inner wall of the outer fixed sleeve. The directional block and the directional groove are directionally slidably arranged in cooperation. The directional groove is opened on the outer wall of the quick-clamp tube and cooperates with the directional block to realize the guiding and positioning function.

[0011] The present invention is further configured such that the rotation of the outer rotating frame moves the groove away from the extension frame, pushes the extension frame away from the embedding groove, disengages the quick-clamp tube from the outer fixed sleeve, and the extension frame is laterally slidably installed on the outer wall of the outer fixed sleeve, which can be embedded in the embedding groove of the quick-clamp tube, providing mechanical locking.

[0012] The present invention is further configured such that a double-layer clamping ring is fixedly installed on the outer wall of the outer fixed sleeve, and a receiving clamping ring is installed at the bottom end of the outer rotating sleeve. The receiving clamping ring is limited to rotate within the double-layer clamping ring, and the double-layer clamping ring is fixedly installed on the outer wall of the outer fixed sleeve, providing a rotational limiting basis for the outer rotating sleeve.

[0013] The present invention is further configured such that a positioning hole is provided on the double-layer clamping ring, and a bidirectional spring rod is installed on the clamping ring. The bidirectional spring rod can extend into the positioning hole step by step, so that the outer rotating sleeve can rotate stably. The positioning hole receives the bidirectional spring rod and provides a positioning function for the rotation angle.

[0014] The present invention is further configured such that a sealing ring is installed on the outer wall of the quick-release tube, and the sealing ring is pressed against the inner wall of the outer fixed sleeve. The pressing of the sealing ring against the inner wall of the outer fixed sleeve provides additional sealing protection and enhances the overall sealing performance.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a urea valve, which has the following beneficial effects:

[0017] This utility model features a quick external connection mechanism. Through the plug-in design of the outer fixed sleeve and quick-clamp tube, the quick external connection mechanism enables the rapid connection and disassembly of the urea valve. The double sealing design of the sealing ring and the encryption ring effectively prevents fluid leakage. The cooperation between the directional block and the directional groove ensures the correct connection direction, prevents incorrect installation, improves the convenience of operation and the reliability of connection, and solves the problem of cumbersome and time-consuming traditional connection methods.

[0018] This utility model is equipped with a connection stabilization mechanism, which adopts a mechanical locking design between the extension frame and the embedded groove. It achieves automatic locking under the elastic force of the extension spring. The allowance groove allows the extension frame to slide slightly longitudinally, providing adaptive adjustment space. The rotation unlocking design of the outer rotating frame facilitates quick disassembly. This structure significantly improves connection stability and prevents accidental detachment due to vibration or pressure changes during use, while maintaining ease of operation.

[0019] This utility model is equipped with a stabilizing auxiliary mechanism. Through the coordinated work of the outer rotating sleeve, the rotating push plate and the pushed plate, the rotational force is converted into longitudinal thrust. The rubber ring applies elastic pressure to the extension frame, making the quick-clamp tube press more tightly against the sealing ring, enhancing the sealing effect. The limiting design of the double-layer clamping ring and the clamped ring, together with the angle control of the bidirectional spring rod and the positioning hole, realizes stable and precise rotation operation, providing additional stability and sealing reliability for the connection, and effectively coping with various challenges in the working environment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the device in the unused state of this utility model;

[0021] Figure 2 This is a schematic diagram of the rapid external connection mechanism in this utility model;

[0022] Figure 3 This is a schematic diagram of the connecting and stabilizing mechanism in this utility model;

[0023] Figure 4 This is a schematic diagram of the structure connecting the stabilizing mechanism and the stabilizing auxiliary mechanism in this utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the connecting stabilizing mechanism and the stabilizing auxiliary mechanism in this utility model.

[0025] In the diagram: 1. Urea valve body; 2. Outer fixed sleeve; 3. Quick-clamp tube; 4. Sealing ring; 5. Outer rotating bracket; 6. Extension bracket; 7. Groove; 8. Extension spring; 9. Embedded groove; 10. Reserve groove; 11. Outer rotating sleeve; 12. Rubber ring; 13. Rotary push plate; 14. Push plate; 15. Connecting plate; 16. Orientation groove; 17. Orientation block; 18. Double-layer clamping ring; 19. Clamping ring; 20. Positioning hole; 21. Two-way spring rod; 22. Encryption ring. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-5 The urea valve includes a urea valve body 1, a quick external connection mechanism, a connection stabilization mechanism, and a stabilization auxiliary mechanism. The quick external connection mechanism includes an outer fixed sleeve 2 and a quick-clamp tube 3. The outer fixed sleeve 2 is fixedly installed at the outlet and inlet ends of the urea valve body 1. The quick-clamp tube 3 can be directionally inserted into the outer fixed sleeve 2. A sealing ring 4 is installed on the inner wall of the outer fixed sleeve 2. The side wall of the quick-clamp tube 3 can be pressed against the sealing ring 4. The connection stabilization mechanism includes an outer rotating frame 5 and an extension frame 6. The outer rotating frame 5 is rotatably limited and installed on the outer fixed sleeve 1. On the outer wall of the fixed sleeve 2, the outer rotating frame 5 has a groove 7. The extension frame 6 is slidably installed on the outer wall of the outer fixed sleeve 2. An extension spring 8 is installed between the extension frame 6 and the outer wall of the outer fixed sleeve 2. An embedding groove 9 is provided on the outer wall of the quick-clamp tube 3. The extension spring 8 can pull the extension frame 6 into the embedding groove 9, so that the quick-clamp tube 3 is stably connected in the outer fixed sleeve 2. An allowance groove 10 is provided on the outer wall of the outer fixed sleeve 2. The extension frame 6 is set to slide slightly longitudinally in the allowance groove 10.

[0030] In this embodiment, the quick-connect mechanism achieves rapid connection through the outer fixed sleeve 2 and the quick-clamp tube 3. During use, the quick-clamp tube 3 is oriented and inserted into the outer fixed sleeve 2. The side wall of the quick-clamp tube 3 presses against the sealing ring 4 on the inner wall of the outer fixed sleeve 2, forming a sealed connection. The directional groove 16 on the outer wall of the quick-clamp tube 3 slides in conjunction with the directional block 17 on the inner wall of the outer fixed sleeve 2 to ensure correct insertion direction. After connection, the connecting plate 15 at one end of the quick-clamp tube 3 connects with the outer tube body, forming a complete flow channel. Furthermore, the encryption ring 22 on the outer wall of the quick-clamp tube 3 connects with the inner wall of the outer fixed sleeve 2. The wall compression further enhances the sealing performance. The connection stabilization mechanism ensures that the connection between the quick-clamp tube 3 and the outer fixed sleeve 2 is stable and reliable. When the quick-clamp tube 3 is inserted into the outer fixed sleeve 2, the embedding groove 9 on the outer wall of the quick-clamp tube 3 aligns with the extension bracket 6 on the outer wall of the outer fixed sleeve 2. Under the pulling force of the extension spring 8, the extension bracket 6 automatically embeds into the embedding groove 9 to form a mechanical lock. The allowance groove 10 on the outer wall of the outer fixed sleeve 2 allows the extension bracket 6 to slide slightly longitudinally, providing a certain adjustment space. The locking method prevents the quick-clamp tube 3 from accidentally falling off, while maintaining a certain degree of elasticity and adaptability.

[0031] The stabilizing auxiliary mechanism includes an outer rotating sleeve 11 and a rubber ring 12. The outer rotating sleeve 11 is rotatably mounted on the outer wall of the outer fixed sleeve 2. A rotary push plate 13 is installed at the top end of the outer rotating sleeve 11. A push plate 14 is longitudinally slidably mounted on the outer wall of the outer fixed sleeve 2, and the rubber ring 12 is installed at the top end of the push plate 14. The rotation of the rotary push plate 13 causes the push plate 14 to longitudinally push the rubber ring 12 against the bottom of the extension frame 6, causing the extension frame 6 to move slightly longitudinally, and causing the outer wall of the quick-clamp tube 3 to press against the sealing ring 4.

[0032] In this embodiment, the stabilizing auxiliary mechanism provides additional stability and sealing enhancement through the outer rotating sleeve 11 and the rubber ring 12. During operation, rotating the push plate 13 at the top of the outer rotating sleeve 11 causes the longitudinally sliding push plate 14 on the outer wall of the outer fixed sleeve 2 to move upward. The rubber ring 12 at the top of the push plate 14 presses against the bottom of the extension frame 6, causing the extension frame 6 to move slightly longitudinally, thereby making the outer wall of the quick-clamp tube 3 press more tightly against the sealing ring 4, enhancing the sealing effect. The outer rotating sleeve 11 is limited to rotating within the double-layer clamping ring 18 by the clamping ring 19 at the bottom. The bidirectional spring rod 21 can extend into the positioning hole 20 step by step to achieve stable rotation control.

[0033] Please see Figures 1-5As a supplementary implementation of the urea valve for the quick-connect mechanism, connection stabilization mechanism, and stabilization auxiliary mechanism: A connecting plate 15 is installed at one end of the quick-clamping tube 3, and it is connected to the external pipe body through the connecting plate 15. A directional groove 16 is opened on the outer wall of the quick-clamping tube 3, and a directional block 17 is installed on the inner wall of the outer fixed sleeve 2. The directional block 17 and the directional groove 16 are directionally slidably arranged. The rotation of the outer rotating frame 5 causes the groove 7 to move away from the extension frame 6, pushing the extension frame 6 away from the embedding groove 9, so that the quick-clamping tube 3 and the outer fixed sleeve 2 are connected. The sleeve 2 is disengaged from the snap-fit. A double-layer clamping ring 18 is fixedly installed on the outer wall of the outer fixed sleeve 2. A receiving clamping ring 19 is installed at the bottom end of the outer rotating sleeve 11. The receiving clamping ring 19 is limited to rotate within the double-layer clamping ring 18. A positioning hole 20 is opened on the double-layer clamping ring 18. A bidirectional spring rod 21 is installed on the receiving clamping ring 19. The bidirectional spring rod 21 can extend into the positioning hole 20 step by step to make the outer rotating sleeve 11 rotate stably. A security ring 22 is installed on the outer wall of the quick-clamp tube 3, and the security ring 22 is pressed against the inner wall of the outer fixed sleeve 2.

[0034] More specifically, the quick-release tube 3 is inserted directionally into the outer sleeve 2 at the outlet or inlet end of the urea valve body 1. The directional groove 16 of the quick-release tube 3 cooperates with the directional block 17 to ensure the correct orientation. During insertion, the side wall of the quick-release tube 3 presses against the sealing ring 4, and the sealing ring 22 is squeezed against the inner wall of the outer sleeve 2 to form a preliminary seal. When the quick-release tube 3 reaches the appropriate position, the extension spring 8 pulls the extension bracket 6 into the insertion groove 9 on the outer wall of the quick-release tube 3 to achieve mechanical locking and prevent accidental dislodgement. The outer rotating sleeve 11 is then rotated. The upper rotary push plate 13 applies pressure to the extension frame 6 through the push plate 14 and the rubber ring 12, causing the quick-clamp tube 3 to press further against the sealing ring 4, enhancing the sealing effect. The clamping ring 19 at the bottom of the outer rotating sleeve 11 rotates within the double-layer clamping ring 18. The bidirectional spring rod 21 extends into the positioning hole 20 to provide stable rotation control. When disassembly is required, rotate the outer rotating frame 5 to move the groove 7 away from the extension frame 6, push the extension frame 6 away from the embedded groove 9, release the mechanical lock, and then pull out the quick-clamp tube 3 to complete the disassembly.

[0035] In summary, during the use or operation of the overall equipment: when the quick external connection mechanism is required, the quick external connection mechanism achieves a quick connection through the outer fixed sleeve 2 and the quick-clamp tube 3. During use, the quick-clamp tube 3 is oriented and inserted into the outer fixed sleeve 2. The side wall of the quick-clamp tube 3 presses against the sealing ring 4 on the inner wall of the outer fixed sleeve 2 to form a sealed connection. The directional groove 16 on the outer wall of the quick-clamp tube 3 cooperates with the directional block 17 on the inner wall of the outer fixed sleeve 2 to ensure the correct insertion direction. After the connection is completed, the connecting plate 15 at one end of the quick-clamp tube 3 cooperates with the external tube body to form a complete flow channel. In addition, the encryption ring 22 on the outer wall of the quick-clamp tube 3 is squeezed against the inner wall of the outer fixed sleeve 2 to further enhance the sealing performance.

[0036] When the stabilizing mechanism is required to operate, it ensures a stable and reliable connection between the quick-release tube 3 and the outer sleeve 2. After the quick-release tube 3 is inserted into the outer sleeve 2, the embedding groove 9 on the outer wall of the quick-release tube 3 aligns with the extension bracket 6 on the outer wall of the outer sleeve 2. Under the tension of the extension spring 8, the extension bracket 6 automatically embeds into the embedding groove 9, forming a mechanical lock. The allowance groove 10 on the outer wall of the outer sleeve 2 allows the extension bracket 6 to slide slightly longitudinally, providing a certain adjustment space. The locking method prevents the quick-release tube 3 from accidentally falling off, while maintaining a certain degree of elasticity and adaptability.

[0037] When the stabilizing auxiliary mechanism is required to operate, it provides additional stability and sealing enhancement through the outer rotating sleeve 11 and the rubber ring 12. During operation, rotating the push plate 13 at the top of the outer rotating sleeve 11 causes the longitudinally sliding push plate 14 on the outer wall of the outer fixed sleeve 2 to move upward. The rubber ring 12 at the top of the push plate 14 presses against the bottom of the extension frame 6, causing the extension frame 6 to move slightly longitudinally, thereby making the outer wall of the quick-clamp tube 3 press more tightly against the sealing ring 4, enhancing the sealing effect. The outer rotating sleeve 11 is limited to rotating within the double-layer clamping ring 18 through the clamping ring 19 at the bottom. The bidirectional spring rod 21 can extend into the positioning hole 20 step by step to achieve stable rotation control.

[0038] Insert the quick-release tube 3 into the outer sleeve 2 at the outlet or inlet end of the urea valve body 1. The directional groove 16 of the quick-release tube 3 cooperates with the directional block 17 to ensure the correct orientation. During insertion, the side wall of the quick-release tube 3 presses against the sealing ring 4, and the encryption ring 22 is squeezed against the inner wall of the outer sleeve 2 to form a preliminary seal. When the quick-release tube 3 reaches the appropriate position, the extension spring 8 pulls the extension frame 6 into the embedding groove 9 on the outer wall of the quick-release tube 3 to achieve mechanical locking and prevent accidental dislodgement. Rotate the rotary push plate 13 on the outer rotating sleeve 11, and apply pressure to the extension frame 6 through the push plate 14 and the rubber ring 12, so that the quick-release tube 3 is further pressed against the sealing ring 4 to enhance the sealing effect. The clamping ring 19 at the bottom of the outer rotating sleeve 11 rotates in the double-layer clamping ring 18. The bidirectional spring rod 21 extends into the positioning hole 20 to provide stable rotation control. When disassembly is required, rotate the outer rotating frame 5 to move the groove 7 away from the extension frame 6, push the extension frame 6 away from the embedding groove 9, release the mechanical lock, and then pull out the quick-release tube 3 to complete the disassembly.

[0039] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

[0040] In all the solutions mentioned above, those involving the operation of electrical components, unless otherwise explicitly described, are controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies, and their specific circuit structures will not be elaborated here. In all the solutions mentioned above, those involving motors can be used with a reducer if necessary. The connection structure and working principle between the motor and the reducer are existing, well-known technologies, and will not be elaborated here.

Claims

1. A urea valve, comprising a urea valve body (1), a quick external connection mechanism, a connection stabilization mechanism, and a stabilization auxiliary mechanism, characterized in that: The quick external connection mechanism includes an outer fixed sleeve (2) and a quick-clamp tube (3). The outer fixed sleeve (2) is fixedly installed at the outlet and inlet ends of the urea valve body (1). The quick-clamp tube (3) can be directionally inserted into the outer fixed sleeve (2). A sealing ring (4) is installed on the inner wall of the outer fixed sleeve (2). The side wall of the quick-clamp tube (3) can be pressed against the sealing ring (4). The connection stabilization mechanism includes an outer rotating frame (5) and an insertion frame (6). The outer rotating frame (5) is rotatably mounted on the outer wall of the outer fixed sleeve (2). A recess is provided on the outer rotating frame (5). The groove (7) and the insertion frame (6) are laterally slidably installed on the outer wall of the outer fixed sleeve (2). An insertion spring (8) is installed between the insertion frame (6) and the outer wall of the outer fixed sleeve (2). An embedding groove (9) is opened on the outer wall of the quick-clamp tube (3). The insertion spring (8) can pull the insertion frame (6) into the embedding groove (9) so that the quick-clamp tube (3) is stably connected in the outer fixed sleeve (2). A margin groove (10) is opened on the outer wall of the outer fixed sleeve (2). The insertion frame (6) is slightly longitudinally slidable in the margin groove (10).

2. The urea valve according to claim 1, characterized in that: The stabilizing auxiliary mechanism includes an outer rotating sleeve (11) and a rubber ring (12). The outer rotating sleeve (11) is rotatably mounted on the outer wall of the outer fixed sleeve (2). A rotary push plate (13) is installed at the top end of the outer rotating sleeve (11). A push plate (14) is longitudinally slidably mounted on the outer wall of the outer fixed sleeve (2). The rubber ring (12) is installed at the top end of the push plate (14). The rotation of the rotary push plate (13) causes the push plate (14) to longitudinally push the rubber ring (12) against the bottom of the extension frame (6), causing the extension frame (6) to move slightly longitudinally, and causing the outer wall of the quick-clamp tube (3) to press against the sealing ring (4).

3. The urea valve according to claim 1, characterized in that: One end of the quick-release tube (3) is equipped with a connecting plate (15), and is connected to the external tube body through the connecting plate (15).

4. The urea valve according to claim 1, characterized in that: The outer wall of the quick-release tube (3) is provided with a directional groove (16), and the inner wall of the outer fixed sleeve (2) is provided with a directional block (17). The directional block (17) and the directional groove (16) are directionally slidably configured.

5. The urea valve according to claim 1, characterized in that: The rotation of the outer rotating frame (5) causes the groove (7) to move away from the extension frame (6), pushes the extension frame (6) away from the embedding groove (9), and causes the quick-clamp tube (3) to disengage from the outer fixed sleeve (2).

6. The urea valve according to claim 2, characterized in that: A double-layer clamping ring (18) is fixedly installed on the outer wall of the outer fixed sleeve (2), and a receiving ring (19) is installed at the bottom end of the outer rotating sleeve (11). The receiving ring (19) is limited to rotating within the double-layer clamping ring (18).

7. The urea valve according to claim 6, characterized in that: The double-layer clamping ring (18) is provided with a positioning hole (20), and a bidirectional spring rod (21) is installed on the clamping ring (19). The bidirectional spring rod (21) can extend into the positioning hole (20) step by step, so that the outer rotating sleeve (11) can rotate stably.

8. The urea valve according to claim 1, characterized in that: The fast-lock tube (3) is provided with a security ring (22) installed on its outer wall, and the security ring (22) is pressed against the inner wall of the outer sleeve (2).

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