Rotary valve and experimental system with same

Abstract

The invention discloses a rotary valve and an experiment system with the rotary valve, the rotary valve provided by the invention has four rotary positions, liquid at different positions in the four positions flows out from the same waste liquid interface on a first valve body, interfaces on the outer surface of the first valve body are simplified, the number of the interfaces on the first valve body is only seven, and the number of the interfaces on the first valve body is greatly reduced. The first valve body can achieve the same function as a rotary valve with eight or more connectors in the prior art, and the first valve body is simple in structure and low in manufacturing cost.

Description

Technical Field

[0001] The present application relates to the technical field of fluid equipment, and in particular to a rotary valve and an experimental system having the rotary valve. Background Art

[0002] Rotary valves of different structures are usually used in liquid chromatography analysis systems to meet experimental requirements. Usually, there are many functions to be realized in liquid chromatography analysis systems, and the structure of the rotary valve is relatively complex. Some rotary valves have as many as eight or even more external structures. The rotary valve has a complex structure and is difficult to process, so the manufacturing cost is relatively high.

[0003] Therefore, how to simplify the structure of the rotary valve and reduce the experimental cost has always been a technical issue that technicians in this field are concerned about. Summary of the invention

[0004] One object of the present application is to provide a rotary valve with a relatively simple structure and relatively low use cost. Another object of the present application is to provide an experimental system having the rotary valve.

[0005] The present application provides a rotary valve, comprising a first valve body and a second valve body capable of relative rotation; the first valve body has a connecting surface and a first mating surface, the connecting surface is provided with a first liquid injection interface (syr), a second liquid injection interface (syp), a sample pump interface (sap), a chromatography column interface (col), a waste liquid interface (w), a first sample loop interface (loopf) and a second sample loop interface (loope); the mating surface has a first opening, a second opening, a third opening, a fourth opening, a fifth opening, and a sixth opening to a seventh opening, which correspond to the first liquid injection interface (syr), the second liquid injection interface (syp), the sample pump interface (sap), the chromatography column interface, the waste liquid interface, the first sample loop interface and the second sample loop interface one by one and are connected through the interior of the first valve body; wherein the number of the waste liquid interface is one, the fifth opening comprises a first slot section and a second slot section connected, the first slot section has at least two points located on the same diameter, and the second slot section extends along the radial direction of the first valve body;

[0006] The second valve body is provided with a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a fifth flow channel, and the flow channels are not connected to each other;

[0007] The second valve body can rotate relative to the first valve body to a first position, a second position, a third position and a fourth position;

[0008] When the second valve body is in the first position, the second injection interface is connected to the chromatography column interface through the second flow channel, the first injection interface is connected to the first sample loop interface through the fourth flow channel, and the second sample loop interface is connected to the waste liquid interface through the first flow channel and the first groove section;

[0009] When the second valve body is in the second position, the second injection interface is connected to the second sample loop interface through the second flow channel, and the first sample loop interface is connected to the chromatography column interface through the fourth flow channel; the first flow channel is connected to the first groove section, so that the sample pump interface is connected to the waste liquid interface;

[0010] When the second valve body is in the third position, the second flow channel is connected to the second groove section, so that the second injection interface is connected to the waste liquid interface; the chromatography column interface is connected to the sample pump interface through the fourth flow channel;

[0011] When the second valve body is in the fourth position, the second injection interface is connected to the chromatography column interface through the second flow channel; the sample pump interface is connected to the first sample loop interface through the fifth flow channel, and the third flow channel is connected to the second groove section, so that the second sample loop interface is connected to the waste liquid interface.

[0012] The rotary valve provided in the present application has four rotation positions, and liquids at different positions of the four positions all flow out from the same waste liquid interface on the first valve body, simplifying the interfaces on the outer surface of the first valve body. The first valve body has only seven interfaces, which can achieve the same function as the current rotary valve with eight or more interfaces on the first valve body. The first valve body of the present application has a simple structure and a relatively low manufacturing cost.

[0013] In one example, the first slot segment is an arc segment,

[0014] Alternatively or / and, the second groove segment is a straight line segment.

[0015] In one example, the second flow channel is a linear groove passing through the rotation center of the second valve body, and the second flow channel includes a first diameter section and a second diameter section located on both sides of the rotation center;

[0016] When the second valve body is located at the first position, the second liquid injection interface is connected to the chromatography column interface through the first diameter section;

[0017] When the second valve body is located at the second position, the second liquid injection interface is connected to the second sample ring interface through the first diameter section;

[0018] When the second valve body is in the third position, the first diameter section is communicated with the second groove section;

[0019] When the second valve body is in the fourth position, the second liquid injection port is connected to the chromatography column port through the second diameter section.

[0020] In one example, the first flow channel and the fourth flow channel are arranged symmetrically with respect to the second flow channel.

[0021] In one example, the first opening, the second opening, the third opening, the fourth opening, the fifth opening, and the sixth opening to the seventh opening all have sections located on the same diameter;

[0022] Alternatively or / and, the first to fifth flow channels are grooves arranged on the end surface of the second valve body.

[0023] In one example, the fifth flow channel is a groove provided on the mating surfaces of the second valve body and the first valve body, and both ends of the groove are located on both sides of the second flow channel and the third flow channel.

[0024] In one example, the fifth flow channel includes two recesses opened on the end surface of the second valve body, and the two recesses are connected through the interior of the second valve body.

[0025] In one example, the two notches of the fifth flow channel are located on both sides of the first flow channel and the second flow channel.

[0026] In one example, the third flow channel is a linear groove.

[0027] The present application also provides an experimental system, comprising a system pump, a sample pump, a chromatography column and a sample loop, and also comprising any of the rotary valves described above.

[0028] The experimental system of the present application has the rotary valve described in any of the above embodiments, so the experimental system also has the above technical effects of the above rotary valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of an embodiment of the test system provided by the present application;

[0030] Figure 2 for Figure 1 The schematic diagram of the structure of the rotary valve in the experimental system shown;

[0031] Figure 3 for Figure 2 A top view of the first valve body from the mating surface direction; the dotted line in the figure is the main internal channel structure of the first valve body;

[0032] Figure 4 for Figure 3 A non-perspective schematic diagram of the structure shown;

[0033] Figure 5 This is a three-dimensional schematic diagram of a second valve body in an embodiment of the present application;

[0034] Figure 6 for Figure 2 A schematic top view of the structure shown;

[0035] Figures 7 to 10 for Figure 2 A perspective schematic diagram of the second valve body in the rotary valve in the first position, the second position, the third position and the fourth position, wherein the perspective diagram of the matching flow passages in the first valve body and the second valve body, and the flow path of the fluid are mainly shown;

[0036] Fig.11 This is a schematic structural diagram of a second valve body in another embodiment of the present application.

[0037] The one-to-one correspondence between the reference numerals and components in the accompanying drawings is as follows:

[0038] 100 rotary valve; 200 sample loop; 300 chromatography column; 400 syringe; 501 first pump; 502 second pump; 503 third pump; 600 waste liquid storage device; 701 first reversing valve; 702 second reversing valve; 703 third reversing valve;

[0039] 1 first valve body; 11' first injection interface; 12' second injection interface; 13' sample pump interface; 14' chromatography column interface; 15' waste liquid interface; 16' first sample loop interface; 17' second sample loop interface; 11 first interface; 12 second interface; 13 third interface; 14 fourth interface; 15 fifth interface; 151 first slot section; 152 second slot section; 16 sixth interface; 17 seventh interface; 11A first channel; 12A second channel; 13A third channel; 14A fourth channel; 15A fifth channel; 16A sixth channel; 17A seventh channel; 101 connection surface; 102 matching surface;

[0040] 2 second valve body; 210 second matching surface; 21 first flow channel; 22 second flow channel; 23 third flow channel; 24 fourth flow channel; 25 fifth flow channel; 251 first recess; 252 first recess; 25A first section; 25B ​​second section. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] This article takes the application of a rotary valve in a liquid chromatography analysis experimental system as an example to introduce the technical solution and technical effects. Those skilled in the art should understand that the rotary valve in this application can also be applied to other systems.

[0043] Please refer to Figures 1 to 10 , Figure 1 A schematic diagram of the structure of an embodiment of the test system provided by the present application; Figure 2 for Figure 1 The schematic diagram of the structure of the rotary valve in the experimental system shown; Figure 3 for Figure 2 A top view of the first valve body from the mating surface direction; the dotted line in the figure is the main internal channel structure of the first valve body; Figure 4 for Figure 3 A non-perspective schematic diagram of the structure shown; Figure 5 This is a three-dimensional schematic diagram of a second valve body in an embodiment of the present application; Figure 6 for Figure 2 A schematic top view of the structure shown; Figures 7 to 10 for Figure 2 The schematic perspective view shows the second valve body in the rotary valve in the first position, the second position, the third position and the fourth position, which mainly shows the perspective view of the matching flow channels in the first valve body and the second valve body, and the flow path of the fluid.

[0044] The present application provides an experimental system, which at least includes a system pump, a sample pump, a chromatography column 300, a sample ring 200 and a rotary valve 100. The number of system pumps can be one or more than two, depending on the specific experimental requirements. The specific structure of the system pump and the sample pump is not recorded in this article, but this does not hinder the understanding of the technical solution of this article by those skilled in the art.

[0045] The system pump is mainly used to provide power for the sample liquid to flow in the experimental system.

[0046] The present application provides a rotary valve, which includes a first valve body 1 and a second valve body 2 that can rotate relative to each other, that is, the second valve body 2 can rotate around the central axis of rotation of the two. The second valve body 2 can be a cylindrical structure. The second valve body 2 can be partially located inside the first valve body 1, that is, the first valve body 1 has an inner cavity, and the second valve body 2 can be partially or completely located in the inner cavity of the first valve body 1, and the first valve body 1 and the second valve body 2 rotate in a circumferential direction. The appearance of the first valve body 1 and the second valve body 2 can be designed as needed, and this article does not make specific restrictions.

[0047] Of course, the second valve body 2 may also be completely located outside the first valve body 1 .

[0048] In this embodiment, the first valve body 1 has a connecting surface and a first mating surface, wherein the connecting surface is provided with a first liquid injection interface 11', a second liquid injection interface 12', a sample pump interface 13', a chromatography column interface 14', a waste liquid interface 15', a first sample ring interface 16' and a second sample ring interface 17', the first liquid injection interface 11' is used to connect the first liquid injection component, the first liquid injection component can be a quantitative solution injection component, such as a syringe 400, the operator can use the syringe 400 to send a small amount of liquid sample into the sample ring 200 through the rotary valve 1. The second liquid injection interface 12' can be connected to the above-mentioned system pump, and the system pump is connected to the second liquid injection interface through a pipeline, a two-way valve or a three-way valve and other valve components. Figure 1 The number of system pumps is shown as three, namely the first pump 501, the second pump 502 and the third pump 503, and the inlet of each pump is connected to a reversing valve: the first reversing valve 701, the second reversing valve 702, and the third reversing valve 703. Figure 1 A1, A2, B1, B2, C1, and C2 represent connected liquid pipelines, respectively. The sample pump interface is connected to the sample pump. The first sample loop interface and the second sample loop interface are connected to the two ends of the sample loop, respectively. The chromatography column interface 14' is connected to the chromatography column 300, and the waste liquid interface 15' is connected to the waste liquid pipeline, and a waste liquid storage device 600 can be set on the waste liquid pipeline.

[0049] In the embodiment of the present application, the mating surface 102 of the first valve body 1 has a first opening 11 to a seventh opening 17, which are respectively connected to the first injection interface 11', the second injection interface 12', the sample pump interface 13', the chromatography column interface 14', the waste liquid interface 15', the first sample ring interface 16' and the second sample ring interface 17' in a one-to-one correspondence. That is, the first injection interface 11' is connected to the first opening 11 through the first channel 11A inside the first valve body 1, and the second injection interface 12' is connected to the second channel 12A inside the first valve body 1. The first valve body 1 is connected to the second opening 12, the sample pump interface 13' is connected to the third opening 13 through the third channel 13A in the first valve body 1, the chromatography column interface 14' is connected to the fourth opening 14 through the fourth channel 14A in the first valve body 1, the waste liquid interface 15' is connected to the fifth opening 15 through the fifth channel 15A in the first valve body 1, the first sample loop interface 16' is connected to the sixth opening 16 through the sixth channel 16A in the first valve body 1, and the second sample loop interface 17' is connected to the seventh opening 17 through the seventh channel 17A in the first valve body 1. The first channel 11A to the seventh channel 17A are independent of each other. As shown in the figure, the internal channels of the first valve body 1 can be of the same shape or different shapes.

[0050] As can be seen from the above description, the connection surface 101 is mainly used to set the connection port with external devices and pipelines such as the system pump, sample pump, chromatography column 300, sample loop 200, syringe 400, etc. The connection surface 101 is usually the outer surface of the first valve body 1.

[0051] Each interface on the connection surface 101 can be set at a suitable position as long as it can be reliably connected to other components. In order to ensure the reliability of the connection pipeline and improve the connection efficiency, the interface of each interface unit can be marked.

[0052] The number of the waste liquid interface 15 ′ in the embodiment of the present application is one, the fifth opening 15 includes a first slot section 151 and a second slot section 152 connected to each other, the first slot section 151 has at least two points located on the same diameter, and the second slot section 152 extends along the radial direction of the first valve body 1 .

[0053] In the present application, the second valve body 2 is provided with a first flow channel 21, a second flow channel 22, a third flow channel 23, a fourth flow channel 24 and a fifth flow channel 25, and the flow channels are not connected to each other; that is, the flow channels are independent of each other.

[0054] The second valve body 2 of the present application can rotate relative to the first valve body 1 to a first position, a second position, a third position and a fourth position.

[0055] Please refer to Figure 7 When the second valve body 2 is in the first position, the second injection interface is connected to the chromatography column interface through the second flow channel 22, and the flow path of the sample is: system pump → second injection interface 12' → second opening 12 → second flow channel 22 → fourth opening 14 → chromatography column interface → chromatography column. At the same time, the first injection interface 11' is connected to the first sample loop interface through the fourth flow channel 24, and the second sample loop interface 17' is connected to the waste liquid interface through the first flow channel 21 and the first groove section 151. The flow path of the liquid in the first injection interface is: syringe 400 → first injection interface 11' → first opening 11 → first sample loop interface 16' → sample loop → second sample loop interface 17' → first groove section 151 → first groove section 151 of the fifth opening 15 → waste liquid interface → waste liquid pipeline.

[0056] In short, in the first position, the syringe 400 can inject a quantitative sample into the sample loop through the rotary valve 100, and discharge the waste liquid in the sample loop through the rotary valve 100. At the same time, the system pump can inject a specific liquid into the chromatography column through the rotary valve 100.

[0057] Please refer to Figure 8When the second valve body 2 is in the second position, the second injection interface 12' is connected to the second sample ring interface 17' through the second flow channel 22, and the first sample ring interface 16' is connected to the chromatography column interface 14' through the fourth flow channel 24. The flow path of the liquid in the system pump is: system pump → second injection interface 12' → second opening 12 → second flow channel 22 → second sample ring interface 17' → sample ring 200 → first sample ring interface 16' → fourth flow channel 24 → chromatography column interface 14'. At the same time, the first flow channel 21 is connected to the first slot section 151, so that the sample pump interface is connected to the waste liquid interface, that is, the liquid in the sample pump can flow to the waste liquid pipeline through the rotary pump, and the flow path is: sample pump → sample pump interface → first flow channel 21 → first slot section 151 of the fifth opening 15 → waste liquid interface 15' → waste liquid pipeline.

[0058] In short, in the second position, the liquid in the sample pump can be discharged to the waste line through the rotary valve 100, and the system pump can load the sample to the chromatography column through the sample loop.

[0059] Please refer to Fig. 9 When the second valve body 2 is in the third position, the second flow channel 22 is connected to the second groove section 152, so that the second injection interface is connected to the waste liquid interface; the chromatography column interface is connected to the sample pump interface through the fourth flow channel 24; the system pump can flush the corresponding flow channel in the rotary valve 100, and the sample pump can load the chromatography column.

[0060] Please refer to Fig.10 When the second valve body 2 is in the fourth position, the second injection interface is connected to the chromatography column interface through the second flow channel 22, and the liquid flow path is: system pump→second injection interface→second opening 12→second flow channel 22→fourth opening 14→chromatography column interface→chromatography column; at the same time, the sample pump interface is connected to the first sample loop interface through the fifth flow channel 25, and the third flow channel 23 is connected to the second groove section 152, so that the second sample loop interface is connected to the waste liquid interface.

[0061] In short, in the fourth position, the liquid in the sample pump can be discharged to the waste liquid pipeline through the rotary valve 100. At the same time, the system pump can fill the chromatography column with liquid.

[0062] The flow rate of the fluid passing through the rotary valve in each position can be controlled by a flow valve (not shown in the figure) arranged on the corresponding pipeline.

[0063] From the above description, it can be seen that the rotary valve 100 provided in the present application has four rotation positions, and the liquids at different positions of the four positions all flow out from the same waste liquid interface on the first valve body 1, which simplifies the interface on the outer surface of the first valve body 1. The first valve body 1 has only seven interfaces, which can achieve the same function as the current rotary valve 100 with eight or more interfaces. The first valve body 1 of the present application has a simple structure and a relatively low manufacturing cost.

[0064] In the embodiment of the present application, the first slot section 151 may be an arc section with a predetermined length, which is conducive to docking with other openings. Of course, the first slot section 151 may also be a curved section in other forms, as long as the above functions can be achieved.

[0065] In the embodiment of the present application, the second slot section 152 is a straight segment, which is easy to process. Of course, the second slot section 152 can also be a non-straight segment, such as a curved and extended slot section.

[0066] In the embodiment of the present application, the second flow channel 22 is a straight groove passing through the rotation center of the second valve body 2, and the second flow channel 22 includes a first diameter section and a second diameter section located on both sides of the rotation center; when the second valve body 2 is in the first position, the second liquid injection interface is connected to the chromatography column interface through the first diameter section; when the second valve body 2 is in the second position, the second liquid injection interface is connected to the second sample ring interface through the first diameter section; when the second valve body 2 is in the third position, the first diameter section is connected to the second groove section 152; when the second valve body 2 is in the fourth position, the second liquid injection interface is connected to the chromatography column interface through the second diameter section.

[0067] In this embodiment, the linear groove can realize the functional requirements of the above four positions and is simple and easy to process.

[0068] In the embodiment of the present application, the first opening 11, the second opening 12, the third opening 13, the fourth opening 14, the fifth opening 15, the sixth opening 16 to the seventh opening 17 all have sections located on the same diameter, which is convenient for processing and rotation to achieve the above functions. Accordingly, the interface on the end surface of the second valve body 2 that is connected to each opening should also cover a partial area of ​​the corresponding opening.

[0069] The first flow channel 21 and the fourth flow channel 24 are symmetrically arranged with respect to the second flow channel 22 , and the first flow channel 21 and the fourth flow channel 24 may be a V-shaped structure, an arc-shaped structure, or an S-shaped structure.

[0070] The fifth flow channel 25 includes two recesses opened on the end face of the second valve body 2, namely a first recess 251 and a second recess 252. The two recesses are connected through the interior of the second valve body 2. This can simplify the structure on the end face of the second valve body 2 as much as possible, provide space for the arrangement of other flow channels, and help to improve the structural strength of the end face, thereby improving the overall strength of the rotary valve 100. Figure 5 The fifth flow channel 25 is shown in FIG. 2 as a V-shaped structure including a first section 251 and a second section 252, which has a simple structure and is easy to process. Of course, the fifth flow channel 25 can also be in other structural forms.

[0071] In a specific embodiment, two notches of the fifth flow channel 25 are located on both sides of the first flow channel 21 and the second flow channel 22 .

[0072] In the above embodiment, the third flow channel 23 is a linear groove, which has a relatively simple structure and is easy to implement.

[0073] In another specific embodiment, please refer to Fig.11 , Fig.11 This is a schematic diagram of the structure of the second valve body in another embodiment of the present application. The first to fifth flow channels can all be grooves arranged on the end surface of the second valve body for easy processing. Figure 5 The embodiment shown is the same as the embodiment shown, except that the fifth flow channel in this embodiment is located on the end surface of the second valve body. The distance from the two end notches of the fifth flow channel to the central axis is Figure 5 The distances from the two notches to the central axis are approximately the same.

[0074] The shapes of the flow channels and the openings in the present application are not limited to the above descriptions herein, as long as they can meet the required functions of the above four positions.

[0075] The experimental system in the embodiment of the present application has the rotary valve described in any of the above embodiments, so the experimental system also has the above technical effects of the above rotary valve.

[0076] The above is a detailed introduction to a rotary valve and an experimental system with the rotary valve provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A rotary valve, characterized in that: It comprises a first valve body and a second valve body which can rotate relative to each other; the first valve body has a connecting surface and a first mating surface, the connecting surface is provided with a first liquid injection interface, a second liquid injection interface, a sample pump interface, a chromatography column interface, a waste liquid interface, a first sample loop interface and a second sample loop interface; the mating surface has a first opening, a second opening, a third opening, a fourth opening, a fifth opening, and a sixth opening to a seventh opening which correspond to the first liquid injection interface, the second liquid injection interface, the sample pump interface, the chromatography column interface, the waste liquid interface, the first sample loop interface and the second sample loop interface one by one and are connected through the interior of the first valve body; The number of the waste liquid interface is one, the fifth opening comprises a first slot section and a second slot section connected to each other, the first slot section has at least two points located on the same diameter, and the second slot section extends along the radial direction of the first valve body; The second valve body is provided with a first flow channel, a second flow channel, a third flow channel, a fourth flow channel and a fifth flow channel, and the flow channels are not connected to each other; The second valve body can rotate relative to the first valve body to a first position, a second position, a third position and a fourth position; When the second valve body is in the first position, the second injection interface is connected to the chromatography column interface through the second flow channel, the first injection interface is connected to the first sample loop interface through the fourth flow channel, and the second sample loop interface is connected to the waste liquid interface through the first flow channel and the first groove section; When the second valve body is in the second position, the second injection interface is connected to the second sample loop interface through the second flow channel, and the first sample loop interface is connected to the chromatography column interface through the fourth flow channel; the first flow channel is connected to the first groove section, so that the sample pump interface is connected to the waste liquid interface; When the second valve body is in the third position, the second flow channel is connected to the second groove section, so that the second injection interface is connected to the waste liquid interface; the chromatography column interface is connected to the sample pump interface through the fourth flow channel; When the second valve body is in the fourth position, the second injection interface is connected to the chromatography column interface through the second flow channel; the sample pump interface is connected to the first sample loop interface through the fifth flow channel, and the third flow channel is connected to the second groove section, so that the second sample loop interface is connected to the waste liquid interface.

2. The rotary valve according to claim 1, characterized in that The first slot segment is an arc segment, Alternatively or / and, the second groove segment is a straight line segment.

3. The rotary valve according to claim 2, characterized in that The second flow channel is a linear groove passing through the rotation center of the second valve body, and the second flow channel includes a first diameter section and a second diameter section located on both sides of the rotation center; When the second valve body is located at the first position, the second liquid injection interface is connected to the chromatography column interface through the first diameter section; When the second valve body is located at the second position, the second liquid injection interface is connected to the second sample ring interface through the first diameter section; When the second valve body is in the third position, the first diameter section is communicated with the second groove section; When the second valve body is in the fourth position, the second liquid injection port is connected to the chromatography column port through the second diameter section.

4. The rotary valve according to claim 3, characterized in that The first flow channel and the fourth flow channel are arranged symmetrically with respect to the second flow channel.

5. The rotary valve according to any one of claims 1 to 4, characterized in that: The first opening, the second opening, the third opening, the fourth opening, the fifth opening, and the sixth opening to the seventh opening all have sections located on the same diameter; Alternatively or / and, the first to fifth flow channels are grooves arranged on the end surface of the second valve body.

6. The rotary valve according to any one of claims 1 to 4, characterized in that: The fifth flow channel is a groove arranged on the matching surfaces of the second valve body and the first valve body, and both ends of the groove are located on both sides of the second flow channel and the third flow channel.

7. The rotary valve according to any one of claims 1 to 4, characterized in that: The fifth flow channel includes two recesses opened on the end surface of the second valve body, and the two recesses are connected through the interior of the second valve body.

8. The rotary valve according to claim 7, characterized in that The two notches of the fifth flow channel are located on both sides of the first flow channel and the second flow channel.

9. The rotary valve according to any one of claims 1 to 6, characterized in that: The third flow channel is a linear groove.

10. An experimental system, characterized in that: The invention comprises a system pump, a sample pump, a chromatography column and a sample loop, and also comprises the rotary valve according to any one of claims 1 to 9.

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