Plug valve

Abstract

The plug valve comprises a valve body and a pressure relief structure, and the valve body is provided with a first circulation cavity, a second circulation cavity and a mounting cavity which communicate with one another; the pressure relief structure comprises a rotating part and a non-return part, the rotating part is rotationally arranged in the mounting cavity, a penetrating part and a communicating part communicating with the penetrating part are formed in the rotating part, the rotating part is suitable for rotating relative to the valve body under the action of external force, so that the penetrating part communicates with the first circulating cavity and the second circulating cavity, and the non-return part is arranged in the communicating part; when the rotating part is assembled on the valve body, air in the mounting cavity is suitable for flowing into the penetrating part from the communicating part through the non-return part, and when the penetrating part communicates with the first circulating cavity and the second circulating cavity, air is suitable for flowing into the first circulating cavity and the second circulating cavity from the penetrating part so as to balance the pressure in the mounting cavity. According to the plug valve of the structure, the pressure in the mounting cavity can be balanced, the rotating piece and the valve body cannot be blocked, and normal work of the plug valve can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a plug valve. Background Art

[0002] A plug valve is a rotary valve in the shape of a closing piece or a plunger. It is a valve that can be opened or closed by rotating 90 degrees to connect or separate the channel opening on the valve plug with the channel opening on the valve body.

[0003] In the prior art, the shape of the valve plug of the plug valve can be cylindrical or conical. In the cylindrical valve plug, the channel is generally rectangular, while in the conical valve plug, the channel is generally trapezoidal. These shapes make the structure of the plug valve light and most suitable for cutting off and connecting media and diverting, but depending on the applicable properties and the erosion resistance of the sealing surface, it can sometimes be used for throttling. As for the assembly of the valve plug, it is all done by installing one end of the valve plug in the groove on the valve body and the other end outside the valve body, so that the staff can rotate the valve plug by rotating the end of the valve plug, so that the channel opening on the valve plug can be connected or blocked with the channel on the valve body.

[0004] However, in the existing plug valve, due to the presence of air in the groove on the valve body when the valve plug is assembled with the valve body, when the end of the valve plug extends into the groove, the end of the valve plug will squeeze the air in the groove, thereby forming a pressure build-up in the groove and causing the valve plug to get stuck. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that when the valve plug of the existing plug valve is assembled with the groove on the valve body, pressure build-up occurs in the groove, causing the valve plug to get stuck.

[0006] To this end, the present invention provides a plug valve, comprising:

[0007] A valve body, on which a first flow cavity, a second flow cavity and a mounting cavity are connected and arranged;

[0008] The pressure relief structure comprises a rotating member and a check member, wherein the rotating member is rotatably arranged in the installation cavity, and a through portion and a connecting portion connected to the through portion are provided on the rotating member, and under the action of an external force, the rotating member is adapted to rotate relative to the valve body so that the through portion is connected to the first flow cavity and the second flow cavity, and the check member is arranged in the connecting portion;

[0009] When the rotating member is assembled on the valve body, the air in the installation cavity is suitable for flowing from the connecting portion into the through-portion through the check member, and when the through-portion is connected with the first circulation chamber and the second circulation chamber, the air is suitable for flowing from the through-portion into the first circulation chamber and the second circulation chamber to balance the pressure in the installation cavity.

[0010] Optionally, in the above-mentioned stopcock, a rotating part is provided on the rotating member, part of the communicating part is opened on the rotating part, a rotating fitting part is provided in the mounting cavity, and the rotating part is suitable for being rotatably connected with the rotating fitting part.

[0011] Optionally, the above-mentioned stopcock valve further includes a bearing, which is arranged in the rotating fitting part, and when the rotating part is rotatably connected with the rotating fitting part, the bearing is arranged between the rotating part and the rotating fitting part.

[0012] Optionally, in the above-mentioned stopcock, the installation cavity has an opening connected to the outside, so that the active end of the rotating member can extend to the outside through the opening.

[0013] Optionally, the above-mentioned stopcock valve further includes a closing member, on which a yielding portion is provided, and the closing member is suitable for being connected to the valve body to close the opening, and the active end of the rotating member is extended to the outside through the yielding portion.

[0014] Optionally, the above-mentioned stopcock valve also includes a holding structure, which includes a bracket and a holding piece. The bracket is connected to the valve body, and a connecting portion is provided on the bracket. The working end of the rotating member is suitable for extending to the outside through the connecting portion and connected to the holding piece, so that the holding piece drives the rotating member to rotate under the action of external force.

[0015] Optionally, in the above-mentioned stopcock valve, the holding structure also includes a positioning piece, the positioning piece is arranged on the bracket, and a positioning mark is provided on the positioning piece. When the holding piece drives the rotating piece to rotate under the action of external force, the holding piece is suitable to correspond to the positioning mark so that the through-hole is connected with the first flow cavity and the second flow cavity.

[0016] Optionally, the above-mentioned plug valve further includes a sealing structure, wherein the sealing structure includes a first sealing member, and the first sealing member is arranged between the rotating member and the valve body to seal the gap between the rotating member and the valve body.

[0017] Optionally, in the above-mentioned stopcock, the sealing structure further includes a second sealing member, and the second sealing member is arranged between the rotating member and the closing member to seal the gap between the rotating member and the closing member.

[0018] Optionally, in the above-mentioned stopcock valve, the sealing structure further includes a third sealing member, and the third sealing member is arranged between the valve body and the closing member to seal the gap between the valve body and the closing member.

[0019] The technical solution provided by the present invention has the following advantages:

[0020] 1. The plug valve provided by the present invention has a pressure relief structure arranged on the valve body, and a first flow chamber, a second flow chamber and a mounting chamber are provided on the valve body and are connected to each other, and the mounting chamber is arranged between the first flow chamber and the second flow chamber, and the pressure relief structure includes a rotating member and a check member, wherein the rotating member is rotatably arranged in the mounting chamber, so that under the action of an external force, the rotating member can rotate relative to the valve body in the mounting chamber, and in addition, a through portion and a connecting portion connected to the through portion are provided on the rotating member, so that when the rotating member rotates relative to the valve body, the through portion can be connected with the first flow chamber and the second flow chamber, thereby allowing the medium flowing in the first flow chamber to flow into the second flow chamber through the through portion to complete the circulation of the medium, and the check member is specifically arranged in the connecting portion, and the check member has a connected state and an isolated state. In the connected state, the air in the mounting chamber can pass through the check member The check piece flows from the connecting part into the through-hole, and in the isolated state, the flowing medium in the through-hole cannot flow from the connecting part into the installing cavity through the check piece. Therefore, through the isolated state of the check piece, when the medium flows from the first circulation cavity to the second circulation cavity, the medium can flow between the first circulation cavity flow and the second circulation cavity through the through-hole, and the medium will not flow from the connecting part into the installing cavity through the check piece, so as to ensure the normal circulation of the medium. Through the connected state of the check piece, the air in the installing cavity will flow from the connecting part into the through-hole through the check piece when the rotating part is assembled, and will flow into the first circulation cavity and the second circulation cavity in the through-hole, and then the air in the installing cavity will be discharged to avoid the formation of pressure in the installing cavity and balance the pressure in the installing cavity. At the same time, it will not cause the rotating part and the valve body to get stuck, which is beneficial to ensure the normal operation of the plug valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic plan view of a plug valve provided in an embodiment of the present invention;

[0023] Figure 2It is a partial plan view of a plug valve provided in an embodiment of the present invention;

[0024] Description of reference numerals:

[0025] 1-valve body; 11-rotational matching part;

[0026] 2-pressure relief structure; 21-rotating member; 211-penetrating portion; 212-connecting portion; 213-rotating portion; 22-check member; 3-bearing; 4-closing member;

[0027] 5-holding structure; 51-bracket; 52-holding member; 53-positioning member;

[0028] 6-sealing structure; 61-first sealing member; 62-second sealing member; 63-third sealing member. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example

[0034] This embodiment provides a plug valve, such as Figure 1 and Figure 2 As shown, it includes a valve body 1 and a pressure relief structure 2, and the valve body 1 is provided with a first flow chamber, a second flow chamber and a mounting chamber that are connected to each other; the pressure relief structure 2 includes a rotating member 21 and a check member 22, the rotating member 21 is rotatably arranged in the mounting chamber, and the rotating member 21 is provided with a through portion 211 and a connecting portion 212 that is connected to the through portion 211, and under the action of external force, the rotating member 21 is suitable for rotating relative to the valve body 1 so that the through portion 211 is connected with the first flow chamber and the second flow chamber, and the check member 22 is arranged in the connecting portion 212; when the rotating member 21 is assembled on the valve body 1, the air in the mounting chamber is suitable for flowing from the connecting portion 212 into the through portion 211 through the check member 22, and when the through portion 211 is connected with the first flow chamber and the second flow chamber, the air is suitable for flowing from the through portion 211 into the first flow chamber and the second flow chamber to balance the pressure in the mounting chamber.

[0035] The plug valve of the above structure has a pressure relief structure 2 arranged on the valve body 1. The valve body 1 is provided with a first flow chamber, a second flow chamber and a mounting chamber which are connected to each other, and the mounting chamber is arranged between the first flow chamber and the second flow chamber. The pressure relief structure 2 includes a rotating member 21 and a check member 22. The rotating member 21 and the check member 22 are respectively a valve plug and a check valve in this embodiment. The rotating member 21 is rotatably arranged in the mounting chamber, so that under the action of external force, the rotating member 21 can rotate relative to the valve body 1 in the mounting chamber. In addition, the rotating member 21 is provided with a through portion 211 and a connecting portion 212 which is connected to the through portion 211. The through portion 211 and the connecting portion 212 are respectively a through hole and a connecting hole in this embodiment. When the rotating member 21 rotates relative to the valve body 1, the through portion 211 can be connected with the first flow chamber and the second flow chamber, so that the medium flowing in the first flow chamber can flow into the second flow chamber through the through portion 211 to complete the circulation of the medium.

[0036] Specifically, the check piece 22 is specifically arranged in the connecting portion 212. The check piece 22 has a connecting state and an isolating state. In the connecting state, the air in the installation cavity can flow from the connecting portion 212 into the through portion 211 through the check piece 22. In the isolating state, the flowing medium in the through portion 211 cannot flow from the connecting portion 212 into the installation cavity through the check piece 22. Therefore, through the isolating state of the check piece 22, when the medium flows from the first flow cavity to the second flow cavity, the medium can flow between the first flow cavity and the second flow cavity through the through portion 211, and the medium The air in the installation cavity will not flow from the connecting portion 212 into the installation cavity through the check piece 22 to ensure the normal circulation of the medium. Instead, through the connected state of the check piece 22, the air in the installation cavity will flow from the connecting portion 212 into the through-portion 211 through the check piece 22 when the rotating part 21 is assembled, and will flow into the first circulation cavity and the second circulation cavity in the through-portion 211, thereby discharging the air in the installation cavity to avoid the formation of pressure build-up in the installation cavity and balance the pressure in the installation cavity. At the same time, it will not cause the rotating part 21 and the valve body 1 to get stuck, which is beneficial to ensure the normal operation of the plug valve.

[0037] The plug valve provided in this embodiment is as follows Figure 1 and Figure 2 As shown, a rotating part 213 is provided on the rotating member 21 , part of the communicating part 212 is opened on the rotating part 213 , a rotating matching part 11 is provided in the installation cavity, and the rotating part 213 is suitable for being rotatably connected with the rotating matching part 11 .

[0038] The stopcock valve of the above structure is provided with a rotating portion 213 on the rotating member 21 and a rotating matching portion 11 provided in the installation cavity. In the present embodiment, the rotating portion 213 and the rotating matching portion 11 are respectively a protrusion provided on the rotating member 21 and a groove provided in the installation cavity. Therefore, when the rotating member 21 is installed in the installation cavity, the rotating portion 213 can be inserted into the rotating matching portion 11 to realize the rotational connection between the rotating portion 213 and the rotating matching portion 11, thereby rotatably setting the rotating member 21 in the installation cavity.

[0039] The plug valve provided in this embodiment is as follows Figure 2 As shown, it also includes a bearing 3, which is arranged in the rotating matching portion 11. When the rotating portion 213 is rotatably connected with the rotating matching portion 11, the bearing 3 is arranged between the rotating portion 213 and the rotating matching portion 11.

[0040] The stopcock valve of the above structure is provided with a bearing 3 between the rotating part 213 and the rotating matching part 11. The bearing 3 is specifically provided in the rotating matching part 11, and when the rotating part 213 is inserted into the rotating matching part 11, the bearing 3 is provided between the rotating part 213 and the rotating matching part 11. Therefore, when the rotating part 213 rotates relative to the rotating matching part 11 under the action of external force, the bearing 3 can effectively reduce the friction between the rotating part 213 and the rotating matching part 11, which is beneficial to improve the service life of the rotating part 21 and the valve body 1.

[0041] The plug valve provided in this embodiment is as follows Figure 1 As shown, the installation cavity has an opening connected to the outside, so that the active end of the rotating member 21 can extend to the outside through the opening.

[0042] The plug valve of the above structure is provided with an opening connected to the outside by setting the installation cavity, so that when the rotating member 21 is installed in the installation cavity, the active end of the rotating member 21 can extend to the outside through the opening, so that the staff can rotate the active end of the rotating member 21 to rotate the rotating member 21 relative to the valve body 1, and make the through-portion 211 connected or disconnected with the first flow cavity and the second flow cavity, so as to realize the flow or non-flow of the medium.

[0043] The plug valve provided in this embodiment is as follows Figure 1 As shown, a closing member 4 is also included. A clearance portion is provided on the closing member 4. The closing member 4 is suitable for being connected to the valve body 1 to close the opening, and the active end of the rotating member 21 is extended to the outside through the clearance portion.

[0044] The plug valve of the above structure is connected to the valve body 1 by a closure member 4, which is a valve cover in this embodiment. The closure member 4 can be connected to the valve body 1, thereby closing the opening of the installation cavity to prevent the medium flowing in the valve body 1 from flowing out to the outside through the opening. At the same time, a yielding portion is provided on the closure member 4, which is a yielding hole in this embodiment, and the yielding portion corresponds to the opening of the installation cavity, so that after the closure member 4 is connected to the valve body 1, the active end of the rotating member 21 can extend to the outside through the opening and the yielding portion.

[0045] The plug valve provided in this embodiment is as follows Figure 1 As shown, it also includes a holding structure 5, which includes a bracket 51 and a holding piece 52. The bracket 51 is connected to the valve body 1, and a connecting portion is provided on the bracket 51. The active end of the rotating member 21 is suitable for extending to the outside through the connecting portion and connected to the holding piece 52, so that under the action of external force, the holding piece 52 drives the rotating member 21 to rotate.

[0046] The stopcock valve of the above structure is provided with a holding structure 5 on the valve body 1, and the holding structure 5 specifically includes a bracket 51 and a holding piece 52, wherein the bracket 51 is connected to the valve body 1, and a connecting portion is provided on the bracket 51, and the connecting portion is a connecting hole in the present embodiment, so that the working end of the rotating member 21 can be extended to the outside through the connecting portion, and the working end of the rotating member 21 extended to the outside can be connected with the holding piece 52, so that the staff can drive the working end of the rotating member 21 to rotate by rotating the holding piece 52, which is conducive to the convenience of operation of the staff.

[0047] The plug valve provided in this embodiment is as follows Figure 1 As shown, the holding structure 5 also includes a positioning member 53, which is arranged on the bracket 51. A positioning mark is arranged on the positioning member 53. When the holding member 52 drives the rotating member 21 to rotate under the action of external force, the holding member 52 is suitable to correspond to the positioning mark so that the through-portion 211 is connected with the first flow cavity and the second flow cavity.

[0048] The stopcock valve of the above structure also includes a positioning member 53 by setting a holding structure 5. The positioning member 53 in the present embodiment is a positioning plate. The positioning member 53 is specifically arranged on the bracket 51, and a positioning mark is arranged on the positioning member 53. Therefore, when the holding member 52 drives the rotating member 21 to rotate under the action of an external force, the holding member 52 can be processed to correspond to the positioning mark on the positioning member 53, so that the through-hole 211 on the rotating member 21 can be connected with the first flow cavity and the second flow cavity. When the holding member 52 does not correspond to the positioning mark on the positioning member 53, it indicates that the through-hole 211 on the rotating member 21 is not connected with the first flow cavity and the second flow cavity.

[0049] The plug valve provided in this embodiment is as follows Figure 1 and Figure 2 As shown, a sealing structure 6 is also included. The sealing structure 6 includes a first sealing member 61 . The first sealing member 61 is disposed between the rotating member 21 and the valve body 1 to seal a gap between the rotating member 21 and the valve body 1 .

[0050] The plug valve of the above structure is provided with a sealing structure 6 on the valve body 1. The sealing structure 6 specifically includes a first sealing member 61. The first sealing member 61 is a ferrule in the present embodiment. The first sealing member 61 is specifically provided between the valve body 1 and the rotating member 21, so that the first sealing member 61 seals the gap between the valve body 1 and the rotating member 21. Therefore, when the medium flows, the medium will not flow into the installation cavity through the gap between the valve body 1 and the rotating member 21.

[0051] The plug valve provided in this embodiment is as follows Figure 1 As shown, the sealing structure 6 further includes a second sealing member 62 , which is disposed between the rotating member 21 and the closing member 4 to seal the gap between the rotating member 21 and the closing member 4 .

[0052] The plug valve of the above structure also includes a second sealing member 62 by setting a sealing structure 6. The second sealing member 62 is a filler in the present embodiment. The second sealing member 62 is specifically arranged between the rotating member 21 and the closing member 4, so that the second sealing member 62 can seal the gap between the closing member 4 and the rotating member 21, thereby preventing the medium from flowing out to the outside through the gap between the closing member 4 and the rotating member 21.

[0053] The plug valve provided in this embodiment is as follows Figure 1 As shown, the sealing structure 6 further includes a third sealing member 63 , which is disposed between the valve body 1 and the closing member 4 to seal the gap between the valve body 1 and the closing member 4 .

[0054] The plug valve of the above structure also includes a third sealing member 63 by setting a sealing structure 6. The third sealing member 63 is a gasket in this embodiment. The third sealing member 63 is specifically arranged between the closing member 4 and the valve body 1, so that the third sealing member 63 can seal the gap between the closing member 4 and the valve body 1, thereby preventing the medium from flowing out to the outside through the gap between the closing member 4 and the valve body 1.

[0055] The plug valve provided by the present invention has a pressure relief structure 2 arranged on the valve body 1, and the valve body 1 is provided with a first flow chamber, a second flow chamber and a mounting chamber that are connected to each other, and the mounting chamber is arranged between the first flow chamber and the second flow chamber. The pressure relief structure 2 includes a rotating member 21 and a check member 22, wherein the rotating member 21 is rotatably arranged in the mounting chamber, so that under the action of an external force, the rotating member 21 can rotate relative to the valve body 1 in the mounting chamber. In addition, the rotating member 21 is provided with a through portion 211 and a connecting portion 212 connected to the through portion 211, so that when the rotating member 21 rotates relative to the valve body 1, the through portion 211 can be connected with the first flow chamber and the second flow chamber, thereby allowing the medium flowing in the first flow chamber to flow into the second flow chamber through the through portion 211 to complete the circulation of the medium. The check member 22 is specifically arranged in the connecting portion 212, and the check member 22 has a connected state and an isolated state. In the connected state, the air in the mounting chamber can pass through the check member 22 The medium flows from the connecting portion 212 into the through-portion 211. In the isolated state, the flowing medium in the through-portion 211 cannot flow from the connecting portion 212 into the installation cavity through the check piece 22. Therefore, through the isolated state of the check piece 22, when the medium flows from the first flow cavity to the second flow cavity, the medium can flow between the first flow cavity and the second flow cavity through the through-portion 211, and the medium will not flow from the connecting portion 212 into the installation cavity through the check piece 22 to ensure the normal circulation of the medium. Through the connected state of the check piece 22, the air in the installation cavity will flow from the connecting portion 212 into the through-portion 211 through the check piece 22 when the rotating part 21 is assembled, and will flow into the first flow cavity and the second flow cavity in the through-portion 211, thereby discharging the air in the installation cavity to avoid the formation of pressure in the installation cavity and balance the pressure in the installation cavity. At the same time, it will not cause the rotating part 21 and the valve body 1 to get stuck, which is beneficial to ensure the normal operation of the plug valve.

[0056] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A plug valve, characterized in that: include: A valve body (1) is provided with a first flow cavity, a second flow cavity and a mounting cavity which are connected to each other; The pressure relief structure (2) comprises a rotating member (21) and a check member (22), wherein the rotating member (21) is rotatably arranged in the installation cavity, and the rotating member (21) is provided with a through portion (211) and a connecting portion (212) connected to the through portion (211); under the action of an external force, the rotating member (21) is adapted to rotate relative to the valve body (1) so that the through portion (211) is connected to the first circulation cavity and the second circulation cavity, and the check member (22) is arranged in the connecting portion (212); When the rotating member (21) is assembled on the valve body (1), the air in the installation cavity is suitable for flowing from the connecting portion (212) into the through-portion (211) through the check member (22), and when the through-portion (211) is connected with the first circulation chamber and the second circulation chamber, the air is suitable for flowing from the through-portion (211) into the first circulation chamber and the second circulation chamber to balance the pressure in the installation cavity.

2. The plug valve according to claim 1, characterized in that: The rotating member (21) is provided with a rotating portion (213), part of the communicating portion (212) is opened on the rotating portion (213), a rotating matching portion (11) is provided in the installation cavity, and the rotating portion (213) is suitable for being rotatably connected with the rotating matching portion (11).

3. The plug valve according to claim 2, characterized in that: It also includes a bearing (3), which is arranged in the rotating matching part (11); when the rotating part (213) is rotationally connected with the rotating matching part (11), the bearing (3) is arranged between the rotating part (213) and the rotating matching part (11).

4. The plug valve according to claim 3, characterized in that: The installation cavity has an opening communicating with the outside world, so that the action end of the rotating member (21) can extend to the outside world through the opening.

5. The plug valve according to claim 4, characterized in that: It also comprises a closing member (4), on which a clearance portion is provided. The closing member (4) is suitable for being connected to the valve body (1) to close the opening, and the active end of the rotating member (21) is extended to the outside through the clearance portion.

6. The plug valve according to any one of claims 1 to 5, characterized in that: The valve body (1) further comprises a holding structure (5), wherein the holding structure (5) comprises a bracket (51) and a holding member (52), wherein the bracket (51) is connected to the valve body (1), and a connecting portion is provided on the bracket (51), and an active end of the rotating member (21) is adapted to extend to the outside through the connecting portion and be connected to the holding member (52), so that under the action of an external force, the holding member (52) drives the rotating member (21) to rotate.

7. The plug valve according to claim 6, characterized in that The holding structure (5) further comprises a positioning member (53), wherein the positioning member (53) is arranged on the bracket (51), and a positioning mark is arranged on the positioning member (53). When the holding member (52) drives the rotating member (21) to rotate under the action of an external force, the holding member (52) is adapted to correspond to the positioning mark so that the through portion (211) is connected to the first circulation cavity and the second circulation cavity.

8. The plug valve according to claim 5, characterized in that: The valve body (21) further comprises a sealing structure (6), wherein the sealing structure (6) comprises a first sealing member (61), wherein the first sealing member (61) is arranged between the rotating member (21) and the valve body (1) to seal a gap between the rotating member (21) and the valve body (1).

9. The plug valve according to claim 8, characterized in that The sealing structure (6) further comprises a second sealing member (62), wherein the second sealing member (62) is arranged between the rotating member (21) and the closing member (4) to seal the gap between the rotating member (21) and the closing member (4).

10. The plug valve according to claim 9, characterized in that The sealing structure (6) further comprises a third sealing member (63), wherein the third sealing member (63) is arranged between the valve body (1) and the closing member (4) to seal the gap between the valve body (1) and the closing member (4).

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