Anti-corrosion vehicle urea filling valve

Abstract

The anti-corrosion urea filling valve comprises a valve body shell, an electromagnetic controller, an air cylinder, a valve rod, a valve element, a liquid inlet and a liquid outlet, the electromagnetic controller is arranged above the valve body shell, the air cylinder is arranged on the left side of the electromagnetic controller, the valve rod is arranged at the lower end of the air cylinder, the valve element is arranged at the lower end of the valve rod, and the liquid outlet is arranged at the lower end of the valve rod. The liquid inlet is formed in the left side of the valve body shell, the liquid outlet is formed in the lower portion of the valve body shell, and the electromagnetic controller is in telecommunication connection with the air cylinder. The function of the utility model is to prevent the urea liquid from being brought into the cylinder to cause pollution due to the vacuum state generated when the valve body is closed; the sealing mechanism can tightly seal the valve rod and the valve body shell, and the situation that different sealing rings are expanded due to long-time use and cause sealing failure is prevented; liquid below the liquid outlet cavity can be emptied, and pollution caused by crystallization of urea liquid remaining in the liquid outlet is prevented.

Description

Technical Field

[0001] This utility model belongs to the field of filling equipment technology, and in particular relates to a corrosion-resistant automotive urea filling valve. Background Technology

[0002] A filling valve is a type of on / off valve that precisely controls the flow rate. It is widely used in machinery used in food, packaging, petrochemical, metallurgy, painting, vehicle, and printing and dyeing industries. Valve features include a lightweight design, beautiful appearance, compact structure, and excellent performance.

[0003] A filling valve disclosed in the prior art, such as Chinese Patent (CN202465241U), includes a valve body with a filling channel. The upper part of the filling channel has a feed inlet, and the lower part has a discharge outlet. The filling channel is divided into a feed chamber, a control chamber, and a discharge chamber from top to bottom. The transition between the feed chamber and the control chamber is a narrow opening. The lower part of the control chamber has a structure that is wider at the top and narrower at the bottom. A cylinder is provided above the valve body. The piston rod of the cylinder is connected to the valve rod. The valve rod extends into the valve body, and the contact point between the valve rod and the valve body is sealed by a sealing ring. The lower end of the valve rod is located inside the control chamber, and a valve head is connected to it. The upper part of the valve head can be in sealed contact with the narrow opening. A flow damper is provided in the discharge chamber.

[0004] This method has the following drawbacks: 1. After the filling valve completes one filling cycle, a certain pressure is generated during the valve's upward retraction, squeezing the urine inside the valve into the cylinder. Under pressure, the sealing ring may not fully function as intended, carrying urine through the valve stem into the closing valve chamber of the air rod. When the next filling valve opens, the urine in the cylinder valve chamber is squeezed through the air pipe into the solenoid valve circuit. Although the amount each time is small, over time, the entire circuit experiences severe crystallization in the solenoid valve and cylinder. During this period, cleaning and replacing the solenoid valve and cylinder are frequent, increasing workload and seriously affecting production. 2. After prolonged use, the O-ring seal between the piston valve stem and the valve body will age and expand, leading to a decrease in sealing performance and requiring replacement of the seal. 3. After the filling valve closes, some unremoved urea will adhere to the lower part of the valve body. This urea will crystallize inside the valve body after drying, causing blockage. At the same time, the detached crystals can also enter the product to be filled, reducing the product's purity.

[0005] Therefore, this utility model provides a corrosion-resistant automotive urea filling valve. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model discloses a corrosion-resistant automotive urea filling valve. By opening a hole at the bottom of the sealed space between the cylinder and the valve to allow atmospheric connection, the vacuum state that may occur between the sealing mechanism and the valve core is released, preventing the vacuum state generated when the valve body is closed from bringing urea liquid into the cylinder and causing contamination. This allows the sealing mechanism to tightly seal the valve stem and the valve body shell, preventing the different sealing rings from expanding due to long-term use and causing sealing failure. It also allows the liquid below the liquid outlet to be drained, preventing urea liquid residue from crystallizing in the liquid outlet and causing contamination.

[0007] To achieve the above technical effects, this utility model provides a corrosion-resistant automotive urea filling valve, including a valve body shell, an electromagnetic controller, a cylinder, a valve stem, a valve core, an inlet, and an outlet. The electromagnetic controller is located above the valve body shell, the cylinder is located to the left of the electromagnetic controller, the valve stem is located at the lower end of the cylinder, the valve core is located at the lower end of the valve stem, the inlet is located on the left side of the valve body shell, and the outlet is located in the lower part of the valve body shell. The electromagnetic controller and the cylinder are electrically connected. The valve body shell also has an inlet chamber, an outlet chamber, and a cleaning chamber inside. The inlet chamber is located above the valve core, the outlet chamber is located below the valve core, and the cleaning chamber, which assists in emptying the liquid in the outlet chamber, is located on the upper side of the outlet chamber. A piston mechanism for generating a pressure difference seal is also provided at the connection between the cylinder and the valve stem. A sealing mechanism is provided at the connection between the valve stem and the upper end of the valve body shell.

[0008] Preferably, the piston mechanism further includes a piston body, a piston cavity, and a connecting pipe. The piston cavity is disposed above the sealing mechanism, the piston body is disposed between the piston cavities, the lower part of the piston body is connected to the upper end of the valve stem, the upper part of the piston body is connected to the output end of the cylinder, and the connecting pipe is disposed on the left side above the piston cavity, with the lower end of the connecting pipe connected to the left side of the cleaning cavity.

[0009] Preferably, the connecting pipe is also equipped with an electric three-way valve, which is electrically connected to the electromagnetic controller.

[0010] Preferably, the sealing mechanism further includes a lip seal ring, a sealing cavity, and a mounting shaft. The sealing cavity is located on the valve body shell on the side of the valve stem, the lip seal ring is located inside the lip seal ring, and the mounting shaft is located inside the right end of the lip seal ring.

[0011] Preferably, the sealing cavity further includes a negative pressure cavity and a pressure relief cavity, with the negative pressure cavity located above the sealing cavity and the pressure relief cavity located below the sealing cavity.

[0012] Preferably, the volume of the negative pressure chamber is larger than the volume of the pressure relief chamber.

[0013] Preferably, a pressure relief channel is provided on the side of the pressure relief chamber, a pressure relief pipe is provided outside the pressure relief channel, and an exhaust valve is provided above the pressure relief pipe.

[0014] Preferably, the sides of the cleaning cavity are provided with guide grooves.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The device is equipped with a cleaning chamber, a piston mechanism, and a sealing mechanism. By opening a hole in the lower part of the sealed space between the cylinder and the valve, the vacuum state that may occur between the sealing mechanism and the valve core is released, preventing the vacuum state generated when the valve body is closed from bringing urea liquid into the cylinder and causing contamination. When the valve body is opened and closed, the sealing mechanism generates a pressure difference below the sealing mechanism, which allows the sealing mechanism to tightly seal the valve stem and the valve body shell, preventing the different sealing rings from expanding and failing due to long-term use. The piston mechanism and the cleaning chamber flush the urea liquid on the surface of the outlet chamber downwards, allowing the liquid below the outlet chamber to be drained, preventing urea liquid residue from crystallizing in the outlet and causing contamination. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention;

[0018] Figure 2 This is a front view of the present invention;

[0019] Figure 3 yes Figure 2 A sectional view of section a.

[0020] Figure 4 yes Figure 3 A partial schematic diagram of b in the middle;

[0021] Figure 5 yes Figure 3 A partial schematic diagram of c in the middle;

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Valve body housing; 2. Electromagnetic controller; 3. Cylinder; 4. Valve stem; 5. Valve core; 6. Liquid inlet; 7. Liquid outlet; 8. Liquid inlet chamber; 9. Liquid outlet chamber; 10. Cleaning chamber; 11. Piston body; 12. Piston chamber; 13. Connecting pipe; 14. Electric three-way valve; 15. Lip seal; 16. Sealing chamber; 17. Mounting shaft; 18. Negative pressure chamber; 19. Pressure relief chamber; 20. Pressure relief channel; 21. Pressure relief pipe; 22. Exhaust valve; 23. Guide groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] The prior art in this embodiment has the following problems: The inventors have discovered the following defects in the prior art: First, after the filling valve completes one filling cycle, a certain pressure will appear during the upward retraction process of the valve closing, squeezing the urine in the valve into the cylinder. Under pressure, the sealing ring may not fully play its due role, carrying the urine through the valve stem into the closing valve chamber of the air rod. When the next filling valve opens, the urine in the cylinder valve chamber will be squeezed into the solenoid valve circuit through the air pipe. Although the amount each time is small, over time, the solenoid valve circuit and cylinder crystallization become severe. During this period, cleaning and replacing solenoid valves and cylinders was frequent, increasing workload and seriously affecting production; secondly, after long-term use, the O-ring seal between the piston valve rod and the valve body will age and expand, which will lead to a poor sealing effect and require replacement of the seal; thirdly, after the filling valve is closed, some unremoved urea will adhere to the lower part of the valve body. After drying, this urea will crystallize inside the valve body, causing blockage inside the valve body. At the same time, the detached crystals will also enter the product to be filled, reducing the purity of the product. Example 1

[0026] like Figures 1 to 5 As shown:

[0027] Therefore, the inventor provides a corrosion-resistant automotive urea filling valve, including a valve body shell 1, an electromagnetic controller 2, a cylinder 3, a valve stem 4, a valve core 5, an inlet 6, and an outlet 7. The electromagnetic controller 2 is located above the valve body shell 1, the cylinder 3 is located to the left of the electromagnetic controller 2, the valve stem 4 is located at the lower end of the cylinder 3, the valve core 5 is located at the lower end of the valve stem 4, the inlet 6 is located to the left of the valve body shell 1, and the outlet 7 is located at the lower part of the valve body shell 1. The electromagnetic controller 2 and the cylinder 3 are electrically connected. The valve body shell 1 also has an inlet chamber 8, an outlet chamber 9, and a cleaning chamber 10 inside. The inlet chamber 8 is located above the valve core 5, the outlet chamber 9 is located below the valve core 5, and the cleaning chamber 10, which assists in emptying the liquid in the outlet chamber 9, is located on the upper side of the outlet chamber 9. A piston mechanism for generating a pressure difference seal is also provided at the connection between the cylinder 3 and the valve stem 4. A sealing mechanism is provided at the connection between the valve stem 4 and the upper end of the valve body shell 1.

[0028] Using the above scheme, when the valve is closed, the cylinder 3 retracts, driving the valve stem 4 upward to lift the valve core 5 and press it against the lower outlet of the liquid inlet chamber 8. The liquid is sealed by the O-ring above the liquid inlet chamber 8. At this time, the liquid will not flow from the lower liquid outlet chamber 9 to the liquid outlet 7. When filling is required, the electromagnetic controller 2 controls the cylinder 3 to extend and lower the valve core 5, releasing the seal between the upper part of the valve core 5 and the liquid inlet chamber 8. This allows the liquid to enter the liquid inlet chamber 8 from the liquid inlet 6, enter the liquid outlet chamber 9 from the side of the valve core 5, and flow out of the liquid outlet 7 into the container to complete the filling. After filling is completed, the cylinder 3 drives the valve stem 4 to retract again, causing the piston mechanism to move upward. During this process, the piston mechanism is linked with the sealing mechanism to prevent liquid backflow. The piston mechanism can also be linked to drain the liquid in the liquid outlet chamber 9 below the cleaning chamber. Example 2

[0029] like Figures 1 to 5 As shown:

[0030] Furthermore, the piston mechanism also includes a piston body 11, a piston cavity 12, and a connecting pipe 13. The piston cavity 12 is disposed above the sealing mechanism, the piston body 11 is disposed between the piston cavities 12, the lower part of the piston body 11 is connected to the upper end of the valve stem 4, the upper part of the piston body 11 is connected to the output end of the cylinder 3, and the connecting pipe 13 is disposed on the left side above the piston cavity 12. The lower end of the connecting pipe 13 is connected to the left side of the cleaning cavity 10.

[0031] Furthermore, an electric three-way valve 14 is also provided on the connecting pipe 13, and the electric three-way valve 14 is electrically connected to the electromagnetic controller 2.

[0032] The piston body 11 moves within the piston cavity 12 as the cylinder 3 controls the valve rod 4 to open and close. When the piston body 11 moves downward, the valve core 5 opens, and liquid filling begins. At this time, the left end of the electric three-way valve 14 is connected to the upper end, allowing external gas to enter the area above the piston cavity 12. The lower end of the electric three-way valve 14 closes to prevent liquid from flowing back into the piston cavity 12 from the lower end. When the piston body 11 moves upward, the valve core 5 closes, stopping the filling process. At this time, the left end of the electric three-way valve 14 closes, and the upper end is connected to the lower end. Gas above the piston cavity 12 flows into the cleaning cavity through the connecting pipe 13. Example 3

[0033] like Figures 1 to 5 As shown:

[0034] Furthermore, the sealing mechanism also includes a lip seal 15, a sealing cavity 16, and a mounting shaft 17. The sealing cavity 16 is disposed on the valve body housing 1 on the side of the valve stem 4, the lip seal 15 is disposed inside the lip seal 15, and the mounting shaft 17 is disposed inside the right end of the lip seal 15.

[0035] Furthermore, the sealing cavity 16 also includes a negative pressure cavity 18 and a pressure relief cavity 19. The negative pressure cavity 18 is located above the sealing cavity 16, and the pressure relief cavity 19 is located below the sealing cavity 16.

[0036] Furthermore, the volume of the negative pressure chamber 18 is larger than the volume of the pressure relief chamber 19;

[0037] Furthermore, a pressure relief channel 20 is provided on the side of the pressure relief chamber 19, a pressure relief pipe 21 is provided outside the pressure relief channel 20, and an exhaust valve 22 is provided above the pressure relief pipe 21.

[0038] When the valve body opens to start the filling operation, the piston body 11 moves downward in the piston cavity 12. The gas below the piston cavity 12 enters the negative pressure cavity 18 through the gap between the valve stem 4 and the valve body shell 1. The gas exerts downward pressure on the lip seal ring 15. At the same time, the lip seal ring 15 rotates downward under pressure on the mounting shaft 17. Depending on the actual use, the mounting shaft 17 can be set as a torsion spring. This forces the gas in the pressure relief cavity 19 downward. Part of the gas is discharged from the pressure relief channel 20 through the half-open exhaust valve 22 on the pressure relief pipe 21. The other part of the gas is discharged into the liquid inlet cavity 8 to form an air seal. This prevents the liquid from entering the liquid inlet cavity 8 from the liquid inlet 6 during filling and flowing back into the piston cavity 12 above through the gap. At the same time, the lip seal ring 15 is subjected to downward pressure, which allows the lip seal ring 15 to fit tightly against the valve stem 4, increasing the sealing effect and preventing the liquid in the filling valve from flowing back.

[0039] After the valve body finishes filling, the piston body 11 moves upward within the piston, squeezing the gas in the piston cavity 12 upward. This gas is then forced through the connecting pipe 13 into the cleaning cavity 10. Upon entering the cleaning cavity 10, the gas blows the residual liquid in the outlet cavity 9 downward, discharging it into a container through the outlet 7. This prevents urea liquid from remaining in the valve and causing blockage and crystallization. Simultaneously, the lower volume of the piston cavity 12 increases, drawing gas out of the negative pressure cavity 18, thus reducing the pressure in the negative pressure cavity 18. At the same time, the pressure relief cavity... Air below 19 enters the pressure relief chamber 19 from the exhaust valve 22 through the pressure relief pipe 21 and pressure relief channel 20. At this time, the pressure in the pressure relief chamber 19 is greater than the pressure in the negative pressure chamber 18. The pressure relief chamber 19 generates an upward pressure on the lip seal 15, causing the lip seal 15 to have an upward tendency on the mounting shaft 17, so that the contact surface between the lip seal 15 and the valve stem 4 is tightly pressed, preventing the liquid in the liquid inlet chamber 8 from being guided upward by the suction force of the cylinder 3 into the space between the cylinder 3 and the electromagnetic controller 2, causing contamination. Example 4

[0040] like Figures 1 to 5 As shown:

[0041] Furthermore, guide grooves 23 are provided on the sides of the cleaning cavity 10;

[0042] After the valve body finishes filling, the gas below the piston chamber 12 enters the cleaning chamber 10, and the airflow is distributed through the guide groove 23 and sprayed downward along the inner wall of the liquid outlet chamber 9, flushing the urea liquid on the surface of the liquid outlet chamber 9 downward, so that the liquid below the liquid outlet chamber 9 can be drained.

[0043] In summary, this device includes a cleaning chamber 10, a piston mechanism, and a sealing mechanism. By opening a hole at the bottom of the sealed space between the cylinder 3 and the valve to allow atmospheric connection, the vacuum state that may occur between the sealing mechanism and the valve core 5 is released, preventing the vacuum state generated when the valve body is closed from bringing urea liquid into the cylinder 3 and causing contamination. When the valve body is opened and closed, the sealing mechanism generates a pressure difference below it, allowing the sealing mechanism to tightly seal the valve stem 4 and the valve body shell 1, preventing the sealing rings from expanding due to long-term use and causing seal failure. The piston mechanism and the cleaning chamber 10 flush the urea liquid on the surface of the outlet chamber 9 downwards, allowing the liquid below the outlet chamber 9 to be drained, preventing urea liquid residue from crystallizing in the outlet 7 and causing contamination.

[0044] The working principle of this utility model:

[0045] When the valve body opens to start the filling operation, the piston body 11 moves downward, the valve core 5 opens, and the liquid begins to be filled. At this time, the left end of the electric three-way valve 14 is connected to the upper end, and the outside gas enters the piston cavity 12. The lower end of the electric three-way valve 14 is closed to prevent the liquid from flowing back into the piston cavity 12 from the lower end.

[0046] Gas below the piston chamber 12 enters the negative pressure chamber 18 through the gap between the valve stem 4 and the valve body shell 1. The gas exerts downward pressure on the lip seal 15, and the lip seal 15 rotates downward under pressure on the mounting shaft 17. Depending on the actual use, the mounting shaft 17 can be set as a torsion spring, which forces the gas in the pressure relief chamber 19 downward. Part of the gas is discharged from the pressure relief channel 20 through the half-open exhaust valve 22 on the pressure relief pipe 21, and the other part of the gas is discharged into the liquid inlet chamber 8 to form an air seal, preventing liquid from entering the liquid inlet chamber 8 from the liquid inlet 6 during filling and flowing back into the piston chamber 12 above through the gap. At the same time, the lip seal 15 is subjected to downward pressure, which allows the lip seal 15 to fit tightly against the valve stem 4, increasing the sealing effect and preventing liquid backflow in the filling valve.

[0047] When the valve body finishes filling, the piston body 11 moves upward, closing the valve core 5 and stopping the filling process. The piston body 11 moves upward within the piston, squeezing the gas in the piston cavity 12 upward. This gas is then forced into the cleaning cavity 10 through the connecting pipe 13. After entering the cleaning cavity 10, the gas blows the residual liquid in the outlet cavity 9 downward, discharging it into a container through the outlet 7. This prevents urea liquid from remaining in the valve and causing blockage and crystallization. Simultaneously, the lower volume of the piston cavity 12 increases, drawing gas out of the negative pressure cavity 18, causing the negative pressure cavity 18 to... As the pressure in chamber 8 decreases, air below the pressure relief chamber 19 enters the pressure relief chamber 19 from the exhaust valve 22 through the pressure relief pipe 21 and the pressure relief channel 20. At this time, the pressure in the pressure relief chamber 19 is greater than the pressure in the negative pressure chamber 18. The pressure relief chamber 19 generates an upward pressure on the lip seal ring 15, causing the lip seal ring 15 to have an upward tendency on the mounting shaft 17, so that the contact surface between the lip seal ring 15 and the valve stem 4 is tightly pressed, preventing the liquid in the liquid inlet chamber 8 from being guided upward by the suction force of the cylinder 3 into the space between the cylinder 3 and the electromagnetic controller 2, causing contamination.

[0048] After the valve body finishes filling, the gas below the piston chamber 12 enters the cleaning chamber 10, and the airflow is distributed through the guide groove 23 and sprayed downward along the inner wall of the liquid outlet chamber 9, flushing the urea liquid on the surface of the liquid outlet chamber 9 downward, so that the liquid below the liquid outlet chamber 9 can be drained, preventing the urea liquid from crystallizing in the liquid outlet 7 and causing pollution.

[0049] This concludes the description of the working principle of the device.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

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

Claims

1. A corrosion-resistant automotive urea filling valve, comprising a valve body shell (1), an electromagnetic controller (2), a cylinder (3), a valve stem (4), a valve core (5), an inlet (6), and an outlet (7), wherein the electromagnetic controller (2) is disposed above the valve body shell (1), the cylinder (3) is disposed to the left of the electromagnetic controller (2), the valve stem (4) is disposed at the lower end of the cylinder (3), the valve core (5) is disposed at the lower end of the valve stem (4), the inlet (6) is disposed to the left of the valve body shell (1), and the outlet (7) is disposed at the lower part of the valve body shell (1), and the electromagnetic controller (2) and the cylinder (3) are electrically connected, characterized in that: The valve body shell (1) is also provided with an inlet chamber (8), an outlet chamber (9), and a cleaning chamber (10). The inlet chamber (8) is located above the valve core (5), the outlet chamber (9) is located below the valve core (5), and the cleaning chamber (10) which helps to drain the liquid in the outlet chamber (9) is located on the upper side of the outlet chamber (9). The connection between the cylinder (3) and the valve stem (4) is also provided with a piston mechanism that generates a pressure difference seal. The connection between the valve stem (4) and the upper end of the valve body shell (1) is provided with a sealing mechanism.

2. The corrosion-resistant automotive urea filling valve according to claim 1, characterized in that: The piston mechanism further includes a piston body (11), a piston cavity (12), and a connecting pipe (13). The piston cavity (12) is located above the sealing mechanism, and the piston body (11) is located between the piston cavities (12). The lower part of the piston body (11) is connected to the upper end of the valve stem (4), and the upper part of the piston body (11) is connected to the output end of the cylinder (3). The connecting pipe (13) is located on the left side above the piston cavity (12), and the lower end of the connecting pipe (13) is connected to the left side of the cleaning cavity (10).

3. The corrosion-resistant automotive urea filling valve according to claim 2, characterized in that: The connecting pipe (13) is also equipped with an electric three-way valve (14), which is electrically connected to the electromagnetic controller (2).

4. The corrosion-resistant automotive urea filling valve according to claim 1, characterized in that: The sealing mechanism further includes a lip seal (15), a sealing cavity (16), and a mounting shaft (17). The sealing cavity (16) is located on the valve body shell (1) on the side of the valve stem (4). The lip seal (15) is located inside the lip seal (15), and the mounting shaft (17) is located inside the right end of the lip seal (15).

5. The corrosion-resistant automotive urea filling valve according to claim 4, characterized in that: The sealing cavity (16) further includes a negative pressure cavity (18) and a pressure relief cavity (19). The negative pressure cavity (18) is located above the sealing cavity (16), and the pressure relief cavity (19) is located below the sealing cavity (16).

6. The corrosion-resistant automotive urea filling valve according to claim 5, characterized in that: The volume of the negative pressure chamber (18) is greater than the volume of the pressure relief chamber (19).

7. A corrosion-resistant automotive urea filling valve according to claim 5, characterized in that: The pressure relief chamber (19) is provided with a pressure relief channel (20) on its side, and a pressure relief pipe (21) is provided outside the pressure relief channel (20). An exhaust valve (22) is provided above the pressure relief pipe (21).

8. The corrosion-resistant automotive urea filling valve according to claim 1, characterized in that: The cleaning cavity (10) is provided with guide grooves (23) on its side.

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