Material stirring structure and canning batching system
By setting up a tank bottom agitator under the mixing rack, the problem of material accumulation under the mixing rod is solved, uniform stirring of the materials in the tank is achieved, and mixing efficiency is improved.
Patent Information
- Application Number
- CN202421975419.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-15
AI Technical Summary
In the prior art, the material under the mixing rod or robotic arm cannot be effectively agitated, causing the material to accumulate at the bottom of the batching tank, affecting the mixing uniformity.
A material mixing structure is designed, including a mixing rack and a tank bottom agitator. The mixing rack and a tank bottom agitator are driven to rotate by driving the source. The mixing rack stirs most of the materials inside the batching tank body, and the tank bottom agitator supplements the bottom agitator, which solves the problem of uneven stirring.
More even stirring of the materials in the tank is achieved, avoiding material accumulation and improving the mixing effect.
Smart Images
Figure CN223042592U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of material stirring, and particularly relates to a material stirring structure and a tank assembly batching system. Background Technique
[0002] In the pharmaceutical and chemical industries, a large number of batching tanks are used to hold materials and stir and mix the materials in the tanks to form semi-finished products. When stirring the materials in the tank, mechanical stirring arms or stirring rods are mostly used to complete the stirring. In order to avoid damaging the inner wall of the batching tank by the mechanical arm or the stirring rod, usually there is a certain distance left between the mechanical arm or the stirring rod and the tank bottom. Although this method of leaving a distance protects the batching tank, the materials under the mechanical arm or the stirring rod cannot be effectively stirred, resulting in some materials accumulating at the bottom of the batching tank under the mechanical arm or the stirring rod, affecting the uniformity of material mixing. Content of the Utility Model
[0003] The utility model provides a material stirring structure and a tank assembly batching system, which can stir materials more evenly and avoid materials accumulating at the bottom of the tank under the stirring frame.
[0004] Embodiments of the utility model can be implemented as follows:
[0005] An embodiment of the utility model provides a material stirring structure, which includes:
[0006] A batching tank body; and
[0007] A stirring frame, which is rotatably arranged inside the batching tank body;
[0008] A tank bottom stirrer, which is located below the stirring frame and is used for stirring the materials deposited at the bottom of the batching tank body;
[0009] A driving source, which is connected to both the stirring frame and the tank bottom stirrer at the same time, and the driving source drives the stirring frame and the tank bottom stirrer to rotate.
[0010] Optionally, the driving source includes a first driving source and a second driving source which are independently arranged. The first driving source is connected to the stirring frame, and the second driving source is connected to the tank bottom stirrer.
[0011] Optionally, the material stirring structure further includes a first rotating shaft and a second rotating shaft. The stirring frame and the first driving source are respectively connected to both ends of the first rotating shaft, and the tank bottom stirrer and the second driving source are respectively connected to both ends of the second rotating shaft.
[0012] Optionally, the vertical projection size of the tank bottom stirrer on the batching tank body is smaller than the vertical projection size of the stirring frame on the batching tank body.
[0013] Optionally, sawteeth are arranged on one side of the tank bottom stirrer away from the second rotating shaft.
[0014] Optionally, the ingredient tank body is provided with a feeding interface, a feeding interface, a discharging interface, a cleaning interface and a steam interface.
[0015] An embodiment of the present invention further provides a tank assembly and batching system, including: a pipeline structure, a support frame, and the material stirring structure as described above.
[0016] Optionally, the pipeline structure includes a material conveying pipe, a feeding pipe, a discharging pipe, a flushing pipe, and a steam pipe;
[0017] The material conveying pipe is connected to the feeding interface;
[0018] The feeding pipe is connected to the feeding interface;
[0019] The discharging pipe is connected to the discharging interface;
[0020] The flushing pipe is connected to the cleaning interface;
[0021] The steam pipe is connected to the steam interface.
[0022] Optionally, the support frame is used to provide an installation position for the drive source, and the support frame is connected to the ingredient tank body.
[0023] Optionally, a sampling valve is provided on the ingredient tank body.
[0024] The beneficial effects of the material stirring structure and the tank assembly and batching system of the embodiments of the present invention include, for example:
[0025] The material stirring structure includes an ingredient tank body, a stirring frame, a bottom stirrer of the tank, and a drive source. The stirring frame is rotatably arranged inside the ingredient tank body. The bottom stirrer of the tank is located below the stirring frame. The drive source is connected to both the stirring frame and the bottom stirrer of the tank at the same time. The drive source drives the stirring frame and the bottom stirrer of the tank to rotate. The material inside the ingredient tank body is stirred and mixed by the rotating stirring frame, and the material deposited at the bottom of the ingredient tank body is stirred by the rotating bottom stirrer of the tank. The problem that materials are likely to accumulate under the stirring frame is solved. At the same time, the stirring frame stirs most of the materials inside the ingredient tank body, and the bottom stirrer of the tank supplements the stirring of the area that the stirring frame cannot effectively stir, so that the materials in the tank can be stirred more evenly.
[0026] The tank assembly and batching system includes a material stirring structure, which has all the functions of the material stirring structure. Description of the Drawings
[0027] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the embodiments. It should be understood that the following attached drawings only show some embodiments of the present utility model, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related attached drawings can also be obtained based on these attached drawings.
[0028] Figure 1 A cross-sectional view of the tank assembly and batching system provided in the first embodiment of the present utility model;
[0029] Figure 2 A schematic diagram of the batching tank body provided in the first embodiment of the present utility model;
[0030] Figure 3 A schematic structural diagram of the stirring frame provided in the first embodiment of the present utility model;
[0031] Figure 4 A schematic structural diagram of the support frame provided in the first embodiment of the present utility model;
[0032] Figure 5 A cross-sectional view of the tank assembly and batching system provided in the second embodiment of the present utility model;
[0033] Figure 6 A cross-sectional view of the tank assembly and batching system provided in the third embodiment of the present utility model.
[0034] Reference numerals: 10 - stirring frame; 11 - first rotating shaft; 20 - tank bottom stirrer; 21 - second rotating shaft; 30 - driving source; 301 - first driving source; 302 - second driving source; 40 - batching tank body; 401 - observation window; 402 - temperature control layer; 501 - feeding pipe; 502 - feeding tube; 503 - discharging pipe; 504 - flushing pipe; 5041 - spray head; 505 - sampling valve; 506 - steam pipe; 60 - support frame; 601 - vertical support rod; 602 - horizontal support rod; 603 - driving source mounting seat; 70 - temperature sensor; 80 - pressure sensor. Detailed implementation manners
[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the attached drawings here can be arranged and designed in various different configurations.
[0036] Accordingly, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the scope of protection of the present utility model.
[0037] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.
[0038] In the description of the present utility model, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.
[0039] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.
[0040] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.
[0041] Unless otherwise clearly defined and limited, terms such as "set", "connect" should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0042] It should be noted that, without conflict, the features in the embodiments of the present utility model can be combined with each other.
[0043] As described in the background art, when mixing multiple materials in places such as chemical plants and pharmaceutical factories, a batching tank / mixing tank / stirring tank is usually used in combination with a corresponding stirring structure for stirring and mixing. However, most of the conventional stirring structures are at a certain height from the bottom of the tank, and it is easy to cause the materials to accumulate at the bottom of the tank during the stirring process, and they cannot be stirred and mixed evenly.
[0044] The material stirring structure and tank batching system provided in the embodiments of the present invention can solve the above problems, and will be described in detail below.
[0045] Embodiment 1
[0046] Reference Figure 1 Referring to
[0047] this embodiment provides a tank batching system, including a batching tank body 40, a pipeline structure, a support frame 60, and a material stirring structure.
[0048] The following is a detailed description of the tank batching system.
[0049] The inside of the batching tank body 40 is hollow and is used to hold the materials that need to be stirred and mixed. The shape of the batching tank body 40 is generally cylindrical. The cylindrical tank body is convenient for stirring the materials and arranging the material stirring structure. At the same time, there are no dead corners when cleaning the inside of the tank. Of course, from the cross-section of the batching tank body 40, it can also be designed into other various shapes such as square, oval, spherical, etc.
[0050] In this embodiment, the batching tank body 40 is cylindrical, and the top and bottom of the batching tank body 40 are arc structures to facilitate the formation of a smooth inner wall to avoid the retention of materials in dead corners, and the top, bottom, and middle of the batching tank body 40 are integrally formed.
[0051] To facilitate the connection of pipeline structures to the batching tank body 40, a feeding interface, a feeding addition interface, a discharging interface, a cleaning interface, and a steam interface are provided on the batching tank body 40. The feeding interface is generally arranged at the top of the batching tank body 40 and can convey different volumes of material according to requirements. If the feeding interface is arranged in the middle of the side wall of the batching tank body 40, materials with a height exceeding the feeding interface cannot be input, and the material volume for single-time stirring and mixing may not be satisfied. The feeding addition interface can be arranged at the top of the batching tank body 40 or on the upper side wall of the batching tank body 40. The discharging interface is arranged at the bottom of the batching tank body 40 so that materials can be smoothly discharged by gravity. The cleaning interface is arranged at the top of the batching tank body 40. The steam interface can be arranged at any position of the batching tank body 40. In this embodiment, it is arranged at the top of the batching tank body 40.
[0052] The pipeline structures include but are not limited to a material conveying pipe 501, a feeding addition pipe 502, a discharging pipe 503, a flushing pipe 504, and a steam pipe 506.
[0053] The material conveying pipe 501 is used to convey materials into the interior of the batching tank body 40, and the material conveying pipe 501 is connected to the feeding interface.
[0054] The feeding addition pipe 502 is used to add materials into the interior of the batching tank body 40 during the material stirring process, and the feeding addition pipe 502 is directly connected to the feeding addition interface on the side wall of the batching tank body 40.
[0055] The discharging pipe 503 is used to discharge materials, and the discharging pipe 503 is connected to the discharging interface.
[0056] After the material stirring is completed, the flushing pipe 504 can be used to clean the residual materials in the batching tank body 40. The flushing pipe 504 is movably inserted into the cleaning interface so that the water outlet end of the flushing pipe 504 can move up and down to clean different parts inside the batching tank body 40. Optionally, a spray head 5041 is connected to the end of the flushing pipe 504. The spray head 5041 is located inside the batching tank body 40 and faces the inner side wall of the batching tank body 40. The spray head 5041 can spray the cleaning liquid discharged from the flushing pipe 504 in a spraying manner to increase the flushing area.
[0057] The steam pipe 506 is used to introduce clean high-temperature steam for sterilizing the interior of the batching tank body 40, and the steam pipe 506 is connected to the steam interface.
[0058] Except for the flushing pipe 504, the above pipelines and the corresponding interfaces can adopt connection methods such as plug-in connection, threaded connection, and welded connection.
[0059] For the case where the mixing of materials needs to be specifically detected, a sampling valve 505 is provided on the side wall of the batching tank body 40. By respectively arranging a plurality of sampling valves 505 at different heights on the side wall of the batching tank body 40, the mixing condition detection of materials at different layers can be realized, providing a reference basis for whether the mixed materials meet the standards. Of course, the sampling valve 505 and the batching tank body 40 are still cooperated in a sealed connection manner to control the on-off during the sampling process.
[0060] Please continue to refer to Figure 1 , the material mixing structure includes a mixing frame 10, a bottom tank stirrer 20, and a driving source 30. The mixing frame 10 and the bottom tank stirrer 20 are both located inside the batching tank body 40. The bottom tank stirrer 20 is located below the mixing frame 10. The mixing frame 10 mixes most of the materials in the batching tank body 40, and the bottom tank stirrer 20 is used to mix the materials deposited at the bottom of the batching tank body 40. The driving source 30 drives the mixing frame 10 and the bottom tank stirrer 20.
[0061] Specifically, the driving source 30 includes a first driving source 301 and a second driving source 302 which are independently arranged. The first driving source 301 is connected to the mixing frame 10, and the mixing frame 10 is driven to rotate by the first driving source 301. The second driving source 302 is connected to the bottom tank stirrer 20, and the bottom tank stirrer 20 is driven to rotate by the second driving source 302. In this embodiment, both the first driving source 301 and the second driving source 302 are servo motors.
[0062] Furthermore, the material mixing structure further includes a first rotating shaft 11 and a second rotating shaft 21. The mixing frame 10 and the first driving source 301 are respectively connected to both ends of the first rotating shaft 11. The bottom tank stirrer 20 and the second driving source 302 are respectively connected to both ends of the second rotating shaft 21. The mixing frame 10 is driven to rotate by the rotation of the first rotating shaft 11, and the bottom tank stirrer 20 is driven to rotate by the rotation of the second rotating shaft 21. The first rotating shaft 11 is welded to the mixing frame 10, and a shaft connector is used between the first rotating shaft 11 and the first driving source 301. Similarly, a welding connection is used between the bottom tank stirrer 20 and the second rotating shaft 21, and a shaft connector is used between the second rotating shaft 21 and the second driving source 302.
[0063] Refer to Figure 1 and in combination with Figure 3 , the mixing frame 10 is formed by connecting a plurality of U-shaped bent rods, and the U-shaped bent rods are also connected to the first rotating shaft 11 through reinforcing rods. Of course, the mixing frame 10 can also be set to other structural shapes, such as being set as a spiral blade, and the spiral blade is distributed along the axial direction of the first rotating shaft 11.
[0064] The bottom tank stirrer 20 is generally cylindrical in shape. On one side of the bottom tank stirrer 20 away from the second rotating shaft 21, there are sawteeth. The materials are agitated through the sawteeth, so that the materials below the stirring frame 10 can also be stirred, avoiding the deposition of materials at the bottom of the tank below the stirring frame 10.
[0065] Since the bottom tank stirrer 20 is arranged between the batching tank body 40 and the stirring frame 10, the vertical projection size of the bottom tank stirrer 20 on the batching tank body 40 is smaller than the vertical projection size of the stirring frame 10 on the batching tank body 40, and the height of the bottom tank stirrer 20 is lower than the distance from the stirring frame 10 to the batching tank body 40. Thus, the rotations of the bottom tank stirrer 20 and the stirring frame 10 do not affect each other. Here, the vertical projection refers to the projection from the top of the batching tank body 40 to the bottom of the batching tank body 40, and the vertical projection size refers to the length and width of the projection.
[0066] In addition, in order to facilitate the installation and positioning of the material stirring structure, a support frame 60 is provided on the batching tank body 40, and the material stirring structure is installed through the support frame 60.
[0067] Reference Figure 1 And in combination with Figure 4 , the support frame 60 includes a vertical support rod 601, a horizontal support rod 602 and a driving source mounting seat 603. The horizontal support rod 602 is connected to the vertical support rod 601 to form a frame structure, and the driving source mounting seat 603 is fixed on this frame structure. The first driving source 301 is installed on the driving source mounting seat 603. There is a threaded hole on the first driving source 301, and a corresponding screw hole is also provided on the driving source mounting seat 603. The first driving source 301 is fixed on the driving source mounting seat 603 by passing a bolt through the threaded hole and the screw hole. Similarly, the second driving source 302 can also be supported and fixed by the support frame 60. At this time, the vertical support rod 601 in the support frame 60 is installed on the ground.
[0068] Of course, the above-described structural form of the support frame 60 is only one implementation manner. The support frame 60 can also be set to any other structural manner. The support frame 60 can be connected to the outer wall of the top of the batching tank body 40, or connected to the side wall of the batching tank body 40, or the support frame 60 is connected and fixed to the ground.
[0069] In addition, when the materials need to be stirred and mixed while maintaining a certain temperature, a temperature regulating layer 402 can be provided on the outer wall of the batching tank body 40 to improve the internal temperature of the batching tank body 40 through the temperature regulating layer 402. The temperature regulating layer 402 covers the outer wall of the batching tank body 40 and is closely attached to the batching tank body 40 to facilitate heat transfer.
[0070] Specifically, the temperature adjustment layer 402 is used to lower or raise the internal temperature of the batching tank body 40. The temperature adjustment layer 402 is made of a material with good thermal conductivity. For example, asbestos is woven into a felt with a certain thickness, and a thin metal tube and a thin electric heating wire are arranged on the inner side of the felt. The two ends of the thin metal tube are connected to a cold source, and the thin electric heating wire is connected to a power source. When it is necessary to raise the temperature inside the batching tank body 40, the thin electric heating wire is energized to generate heat, and the heat is transferred to the batching tank body 40 through the asbestos. When it is necessary to lower the temperature inside the batching tank body 40, the two ends of the thin metal tube are connected to the cold source, and the cold source flows through the thin metal tube. The thin metal tube is in contact with the batching tank body 40, thereby taking away the heat inside the batching tank body 40.
[0071] In order to accurately grasp the pressure and temperature inside the batching tank body 40 during the material stirring process, a temperature sensor 70 and a pressure sensor 80 are provided on the batching tank body 40. Specifically, the detection components or probes of the temperature sensor 70 and the pressure sensor 80 are located inside the batching tank body 40, and the main body parts of the temperature sensor 70 and the pressure sensor 80 are located outside the batching tank body 40. In this embodiment, the models of the temperature sensor 70 and the pressure sensor 80 are not limited, and appropriate ones can be selected according to actual needs.
[0072] Reference Figure 2 , in order to facilitate observing the material stirring situation inside the batching tank body 40, an observation window 401 is provided on the side wall of the batching tank body 40. A through hole penetrating the inside is opened on the side wall of the batching tank body 40, and a transparent material is installed at this through hole. The transparent material is connected to the tank wall of the batching tank body 40 to form the observation window 401. The transparent material used for the observation window 401 is hermetically connected to the through hole on the side wall of the batching tank body 40 by a sealant.
[0073] Embodiment 2
[0074] Reference Figure 5 , the stirring frame 10 is connected to the first rotating shaft 11, the bottom stirrer 20 of the tank is connected to the bottom end of the first rotating shaft 11, and the upper end of the first rotating shaft 11 is connected to the driving source 30. When the driving source 30 starts to work, it drives the first rotating shaft 11, and the first rotating shaft 11 then drives the stirring frame 10 and the bottom stirrer 20 of the tank to rotate. Only one driving source 30 is provided in this embodiment, and the stirring frame 10 and the bottom stirrer 20 of the tank are simultaneously driven by one driving source 30. Other settings are the same as those in Embodiment 1.
[0075] Embodiment 3
[0076] Reference Figure 6, the bottom stirrer 20 is connected to the bottom end of the second rotating shaft 21, the upper end of the second rotating shaft 21 is connected to the first rotating shaft 11, the second rotating shaft 21 is arc-shaped, when the first rotating shaft 11 rotates, it drives the second rotating shaft 21 to rotate, and then drives the bottom stirrer 20 to rotate. Similarly, in this embodiment, only one driving source 30 is provided, and the stirring frame 10 and the bottom stirrer 20 are driven by one driving source 30 at the same time, and the others are the same as those in the first embodiment.
[0077] In summary, the working principle of the tank batching system provided by the above embodiments is as follows:
[0078] When it is necessary to stir and mix materials through the above-mentioned tank batching system, first convey various materials to the inside of the batching tank body 40 through the material conveying pipe 501. After the material conveying is completed, start the driving source 30. The driving source 30 drives the stirring frame 10 and the bottom stirrer 20 to rotate, so as to stir and mix the materials inside the batching tank body 40; after stirring for a period of time, extract the stirred and mixed materials from the sampling valve 505 as samples to detect whether they meet the standards. When the stirred and mixed materials meet the standards, discharge the mixed materials from the discharge pipe 503. When all the materials are discharged, flush the inside of the batching tank body 40 through the flushing pipe 504.
[0079] During the process of stirring and mixing the materials, the internal situation of the batching tank body 40 can be monitored by the temperature sensor 70 and the pressure sensor 80.
[0080] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A material stirring structure, characterized in that: include: Batching tank (40); as well as A stirring frame (10), the stirring frame (10) being rotatably disposed inside the batching tank (40); A tank bottom agitator (20), the tank bottom agitator (20) being located below the agitator frame (10), and the tank bottom agitator (20) being used to agitate the material deposited at the bottom of the batching tank body (40); A driving source (30) is connected to the stirring frame (10) and the tank bottom stirrer (20) at the same time, and the driving source (30) drives the stirring frame (10) and the tank bottom stirrer (20) to rotate.
2. The material stirring structure according to claim 1, characterized in that: The driving source (30) comprises a first driving source (301) and a second driving source (302) which are independently arranged, wherein the first driving source (301) is connected to the stirring frame (10), and the second driving source (302) is connected to the tank bottom agitator (20).
3. The material stirring structure according to claim 2, characterized in that: The material stirring structure also includes a first rotating shaft (11) and a second rotating shaft (21), the stirring frame (10) and the first driving source (301) are respectively connected to the two ends of the first rotating shaft (11), and the tank bottom agitator (20) and the second driving source (302) are respectively connected to the two ends of the second rotating shaft (21).
4. The material stirring structure according to claim 3, characterized in that: The vertical projection size of the tank bottom agitator (20) on the batching tank body (40) is smaller than the vertical projection size of the agitator frame (10) on the batching tank body (40).
5. The material stirring structure according to claim 4, characterized in that: The tank bottom agitator (20) is provided with saw teeth on a side away from the second rotating shaft (21).
6. The material stirring structure according to any one of claims 1 to 5, characterized in that: The batching tank body (40) is provided with a material input interface, a material addition interface, a material output interface, a cleaning interface and a steam interface.
7. A canning material filling system, characterized in that: include: A pipeline structure, a support frame (60), and a material stirring structure as claimed in claim 6.
8. The canning material filling system according to claim 7, characterized in that: The pipeline structure includes a feed pipe (501), a feed pipe (502), a discharge pipe (503), a flushing pipe (504), and a steam pipe (506); The feed pipe (501) is connected to the feed interface; The feeding pipe (502) is connected to the feeding interface; The discharge pipe (503) is connected to the discharge interface; The flushing pipe (504) is connected to the cleaning interface; The steam pipe (506) is connected to the steam interface.
9. The canning material filling system according to claim 7, characterized in that: The support frame (60) is used to provide an installation position for the driving source (30), and the support frame (60) is connected to the batching tank body (40).
10. The canning material filling system according to claim 7, characterized in that: The batching tank (40) is provided with a sampling valve (505).