Plug valve plug assembling device

Abstract

The invention discloses a plug valve plug assembling device, belongs to the technical field of valve assembling, and aims to solve the problem that a plug valve is difficult to assemble. Comprising a driving screw and a sleeve, the lower ends of a plurality of supporting studs are connected with a base, the upper ends of the supporting studs are connected with a supporting plate, a pressing ring is in sliding fit with the supporting studs, the driving screw is in threaded fit with a driving nut, and the sleeve is formed by detachably connecting and splicing two semi-tubular components; when the plug valve is assembled, the two semi-tubular components firstly press the two valve seats into the two annular grooves respectively, then the two semi-tubular components are connected to form a sleeve, the base is connected with the valve body, the sleeve is coaxial with the valve cavity hole, the sleeve is pressed on the valve body through the pressing ring, the lower end of the driving screw rod is connected with the plug cock, and the driving nut is located on the lower side of the connecting plate. When the driving screw rod is clamped, the driving nut is screwed upwards, and the driving screw rod can press the plug cock into the valve cavity hole. The problem that the valve plug of the plug valve is not easy to install is effectively solved.

Description

Technical Field

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

[0002] A plug valve is a valve that uses a plug with a hole as a seal. The plug is rotated by a driving device, and the opening on the plug is connected or closed with the flow channel of the valve body, thereby realizing the on-off function of the valve. The plug valve has a simple structure, fast switching, and low fluid resistance. It relies on the direct contact between the precision-machined valve seat sealing surface and the valve body to seal, so the opening and closing torque is large and the sealing surface is easy to wear.

[0003] In order to ensure the sealing performance of the valve, a combined elastic disc is designed on the back of the valve seat when the plug valve is designed. Before the valve seat is installed, the elastic disc is in an uncompressed state, the outer diameter of the valve seat sealing surface is larger than the inner hole diameter of the valve body, and the plug valve cannot be directly installed inside the valve body. Only when the elastic disc is compressed and deformed by external force, so that the outer diameter of the valve seat sealing surface is less than or equal to the inner hole diameter of the valve body, can it be installed into the valve body. Therefore, when installing and removing the plug valve, the elastic disc is compressed and deformed, and the spring force generated pushes the valve seat and the valve body to fit tightly together, and a large external force is required to overcome the friction between the valve seat and the valve body. If the plug valve is installed incorrectly, or it is installed by force with external force, it is very easy to cause damage to the valve seat sealing surface. Even if the plug valve is assembled into the valve body, the sealing performance of the plug valve cannot be guaranteed. Summary of the invention

[0004] The purpose of the present invention is to provide a plug valve plug assembly device to solve the problem of plug valve assembly difficulties. The technical solution adopted by the present invention is as follows:

[0005] A plug valve plug assembly device, the plug valve includes a valve body, a plug and two valve seats, the valve body is provided with a valve cavity hole that passes through from top to bottom and a medium inlet and outlet hole that passes through from left to right, the axis of the valve cavity hole intersects vertically with the axis of the medium inlet and outlet hole, two valve covers respectively close the two ends of the valve cavity hole, the plug includes a drive shaft head, a plug body and a positioning shaft head that are coaxially connected from top to bottom, a threaded blind hole is machined on the upper end surface of the drive shaft head, annular grooves are machined on both sides of the outer periphery of the plug body, and a horizontal opening and closing hole is provided on the plug body , the driving shaft head passes through the valve cover on the upper side, and the driving shaft head and the valve cover on the upper side are rotatably sealed. A positioning groove is provided on the upper end surface of the valve cover on the lower side, and the positioning shaft head is rotatably matched with the positioning groove. The valve seat is in a ring sleeve shape, and the connecting end surfaces of the two valve seats are respectively abutted against the groove bottoms of the two annular grooves through elastic discs. The sealing end surfaces of the two valve seats are respectively rotatably sealed with the valve cavity hole. When the valve is opened, the opening and closing hole is connected with the medium inlet and outlet holes to form a medium flow channel. When the valve is closed, the two valve seats respectively close the two sides of the medium inlet and outlet holes.

[0006] The assembly device comprises a base, a support stud, a pressure ring, a support plate, a drive screw and a sleeve, wherein the lower ends of the plurality of support studs are respectively connected to the base, the upper ends of the plurality of support studs are respectively connected to the support plate, the pressure rings are respectively slidably matched with the plurality of support studs, the support studs are provided with a second nut, the outer periphery of the sleeve is provided with a flange, the upper end of the drive screw is provided with a square column that can be snap-fitted with a wrench, the drive screw vertically passes through the support plate, the drive nut is threadably matched with the drive screw, the sleeve is composed of two semi-tubular components that are detachably connected and spliced, and the inner diameter of the sleeve is smaller than the inner diameter of the valve cavity hole;

[0007] When assembling the plug valve, the driving nut is located at the lower side of the support plate. First, the two semi-tubular components respectively press the two valve seats into the two annular grooves to compress and deform the two sets of elastic discs. Then, the two semi-tubular components are connected to form a sleeve. Then, the base is connected to the valve body, and the lower end of the sleeve passes through the base and abuts against the valve body. The sleeve is coaxial with the valve cavity hole. The lower end of the driving screw is connected to the threaded blind hole. The second nut is screwed. Several second nuts press the pressure ring onto the flange. Finally, the square column is fixed with a wrench to prevent the driving screw from rotating. The driving nut is screwed upward, and the driving screw is moved downward by using the thread principle, and the plug is pressed into the valve cavity hole.

[0008] When disassembling the plug valve, the driving nut is located on the upper side of the support plate. First, the base is connected to the valve body, so that the lower end of the sleeve passes through the base and abuts against the valve body. The sleeve is coaxial with the valve cavity hole, and the lower end of the driving screw is connected to the threaded blind hole. The second nut is screwed, and several second nuts press the pressure ring onto the flange. Then, the square column is fixed with a wrench to prevent the driving screw from rotating. The driving nut is screwed downward, and the driving screw is moved up by using the thread principle, and the plug is pulled into the sleeve. Then, the assembly device is removed from the valve body. Finally, the sleeve is split into two semi-tubular components and the plug is taken out.

[0009] Furthermore, a pointed ring structure is provided at the lower end of the sleeve, and the pointed ring structure is adapted to the chamfer of the upper end of the valve cavity hole. When the plug valve is assembled, the pointed ring structure cooperates with the chamfered stop of the upper end of the valve cavity hole.

[0010] Furthermore, a third nut is provided at the bottom of the driving screw rod, and when the driving screw rod is connected to the threaded blind hole, it is locked by the third nut.

[0011] Furthermore, the inner diameter of the valve cavity is defined as φD 3 , the inner diameter of the sleeve is φD 2 , then φD 2 Ratio φD 3 Smaller than 0.1mm.

[0012] Furthermore, the surface roughness of the inner hole of the sleeve is less than or equal to Ra0.2.

[0013] Furthermore, the valve body is provided with a plurality of flange blind holes for connecting with the valve cover, the base is composed of two connecting blocks, and a threaded stud is provided at the bottom of the connecting block. The threaded studs of the two connecting blocks respectively cooperate with any two opposite threads in the plurality of flange blind holes on the upper side, so that the two connecting blocks are respectively arranged on the opposite sides of the valve cavity hole, and the number of the supporting studs is two, and the lower ends of the supporting studs are respectively connected to the two connecting blocks.

[0014] Furthermore, two first nuts are provided on the top of the support stud, and the two first nuts are respectively pressed against and locked against the upper and lower end surfaces of the support plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Since the sleeve is composed of two semi-tubular components that can be detachably connected and assembled, the sleeve can be disassembled into two semi-tubular components first, so that sufficient space is formed between the two semi-tubular components, and the space is much larger than the sealing surface distance of the two valve seats when the elastic disc is not compressed, so as to facilitate the accommodation of the assembled plug and valve seat. After the two semi-tubular components are connected to form the sleeve, the sleeve is aligned with the valve cavity hole. Since the inner diameter of the sleeve is smaller than the diameter of the valve cavity hole, the drive nut is screwed, and the plug can be smoothly pressed into the valve cavity hole under the top pressure of the drive screw, which effectively solves the problem that the plug of the plug valve is difficult to install. The present invention has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the plug valve;

[0019] Figure 3 It is a cross-sectional view of the valve body;

[0020] Figure 4 It is a schematic diagram of the assembly of the valve plug and valve seat;

[0021] Figure 5 yes Figure 1 A magnified image of point A;

[0022] Figure 6 This is an axial view of the connection end of the valve seat;

[0023] Figure 7 is a cross-sectional view of the valve seat;

[0024] Figure 8 It is a schematic diagram of the state of disassembling the cock by the present invention;

[0025] Fig. 9 It is a schematic diagram of the sleeve rough machining the inner hole and cutting it into two semi-tubular components;

[0026] Fig.10 It is a schematic diagram of the inner hole being finely machined after two semi-tubular components are combined to form a sleeve;

[0027] Fig.11 is a cross-sectional view of the connection block;

[0028] Fig.12 yes Fig.11 Bottom view of .

[0029] In the figure, 1. valve body, 2. valve seat, 3. elastic disc, 4. plug, 5. valve cover, 6. base, 7. support stud, 8. pressure ring, 9. first nut, 10. support plate, 11. drive nut, 12. drive screw, 13. sleeve, 14. square column, 15. second nut, 16. valve cavity hole, 17. medium inlet and outlet hole, 18. threaded blind hole, 19. drive shaft head, 20. plug body, 21. positioning shaft head, 22. third nut, 23. semi-tubular component, 24. opening and closing hole, 25. pointed ring structure, 26. connecting block, 27. threaded head. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0031] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0033] Example: Figures 1 to 12As shown, a plug valve plug assembly device, the plug valve includes a valve body 1, a plug 4 and two valve seats 2, the valve body 1 is provided with a valve cavity hole 16 penetrating from top to bottom and a medium inlet and outlet hole 17 penetrating from left to right, the axis of the valve cavity hole 16 is perpendicular to the axis of the medium inlet and outlet hole 17, two valve covers 5 respectively close the two ends of the valve cavity hole 16, the plug 4 includes a drive shaft head 19, a plug body 20 and a positioning shaft head 21 coaxially connected from top to bottom, a threaded blind hole 18 is machined on the upper end surface of the drive shaft head 19, annular grooves are machined on both sides of the outer periphery of the plug body 20, the axis of the annular groove is perpendicular to the axis of the plug 4, the plug body 20 is provided with a horizontally penetrating opening and closing hole 24, the The axis of the opening and closing hole 24 intersects the axis of the cock 4 at right angles, the driving shaft head 19 passes through the upper valve cover 5, the driving shaft head 19 rotates and seals with the upper valve cover 5, a positioning groove is provided on the upper end surface of the lower valve cover 5, the positioning shaft head 21 is inserted into the positioning groove, the positioning shaft head 21 rotates and cooperates with the positioning groove, the valve seat 2 is in the shape of a ring sleeve, the connecting end faces of the two valve seats 2 are respectively abutted against the groove bottoms of the two annular grooves through elastic discs 3, the arcuate end faces of the sealing ends of the two valve seats 2 are respectively rotated and sealed with the valve cavity hole 16, when the valve is opened, the opening and closing hole 24 is connected with the medium inlet and outlet hole 17 to form a medium flow channel, when the valve is closed, the two valve seats 2 respectively close the two sides of the medium inlet and outlet hole 17;

[0034] The assembly device comprises a base 6, a support stud 7, a pressure ring 8, a support plate 10, a drive screw 12 and a sleeve 13, wherein the lower ends of a plurality of support studs 7 are respectively connected to the base 6, the upper ends of a plurality of support studs 7 are respectively connected to the support plate 10, the pressure ring 8 is respectively slidably matched with the plurality of support studs 7, a second nut 15 is provided on the support stud 7, a flange is provided on the outer periphery of the sleeve 13, a square column 14 which can be engaged with a wrench is provided on the upper end of the drive screw 12, the drive screw 12 vertically passes through the support plate 10, the drive nut 11 is threadedly matched with the drive screw 12, the sleeve 13 is composed of two semi-tubular components 23 which are detachably connected and spliced, and the inner diameter of the sleeve 13 is smaller than the inner diameter of the valve cavity hole 16;

[0035] When assembling the plug valve, the driving nut 11 is located at the lower side of the support plate 10. First, the two semi-tubular components 23 respectively press the two valve seats 2 into the two annular grooves to compress and deform the two sets of elastic discs 3. Then, the two semi-tubular components 23 are connected to form a sleeve 13. Then, the base 6 is connected to the valve body 1, so that the lower end of the sleeve 13 passes through the base 6 and abuts against the valve body 1. The sleeve 13 is coaxial with the valve cavity hole 16. The lower end of the driving screw 12 is connected to the threaded blind hole 18, and the second nut 15 is screwed. Several second nuts 15 press the pressure ring 8 on the flange. Finally, the square column 14 is fixed with a wrench to prevent the driving screw 12 from rotating. The driving nut 11 is screwed upward, and the driving screw 12 is moved downward by using the thread principle, and the plug 4 is pressed into the valve cavity hole 16.

[0036] When disassembling the plug valve, the drive nut 11 is located on the upper side of the support plate 10. First, the base 6 is connected to the valve body 1, so that the lower end of the sleeve 13 passes through the base 6 and abuts against the valve body 1. The sleeve 13 is coaxial with the valve cavity hole 16. The lower end of the drive screw 12 is connected to the threaded blind hole 18, and the second nut 15 is screwed. Several second nuts 15 press the pressure ring 8 on the flange, and then the square column 14 is fixed with a wrench to prevent the drive screw 12 from rotating. The drive nut 11 is screwed downward, and the drive screw 12 is moved up by using the thread principle, and the plug 4 is pulled into the sleeve 13. Then the assembly device is disassembled from the valve body 1, and finally the sleeve 13 is split into two semi-tubular components 23, and the plug 4 is taken out.

[0037] The lower end of the sleeve 13 is provided with a pointed ring structure 25, which is matched with the upper chamfer of the valve cavity hole 16. When the plug valve is assembled, the pointed ring structure 25 is matched with the chamfered stopper of the upper end of the valve cavity hole 16. The stopper match can facilitate the positioning of the sleeve 13 and the valve cavity hole 16.

[0038] The bottom of the driving screw 12 is provided with a third nut 22, and when the driving screw 12 is connected to the threaded blind hole 18, it is locked by the third nut 22. The third nut is used as a back nut to stop the driving screw 12 and the threaded blind hole 18 from retreating.

[0039] Define the inner diameter of the valve cavity hole 16 as φD 3 , the inner diameter of the sleeve 13 is φD 2 , then φD 2 Ratio φD 3 Smaller than 0.1mm.

[0040] The surface roughness of the inner hole of the sleeve 13 is less than or equal to Ra0.2. Reducing the roughness of the sleeve 13 can make the plug 4 easier to press into the valve cavity hole 16.

[0041] The valve body 1 is provided with a plurality of flange blind holes for connecting with the valve cover 5. The base 6 is composed of two connecting blocks 26. A threaded column head 27 is provided at the bottom of the connecting block 26. The threaded column heads 27 of the two connecting blocks 26 respectively cooperate with any two opposite threads in the plurality of flange blind holes on the upper side, so that the two connecting blocks 26 are respectively arranged on the opposite sides of the valve cavity hole 16. There are two supporting studs 7, and the lower ends of the supporting studs 7 are respectively connected to the two connecting blocks 26.

[0042] Two first nuts 9 are provided on the top of the support stud 7 , and the two first nuts 9 are respectively pressed against and locked with the upper and lower end surfaces of the support plate 10 .

[0043] When machining the sleeve 13, firstly rough-machine the inner diameter of the sleeve 13 to φD 1 , so that φD 1 Ratio φD 3The sleeve 13 is then cut into two semi-tubular components 23 using wire cutting technology, and the two semi-tubular components 23 are connected by hexagonal bolts to form the sleeve 13 again. Finally, the inner diameter of the sleeve 13 is finely machined to φD 2 , so that φD 2 Ratio φD 3 Smaller than 0.1mm.

[0044] When the plug valve of the present invention is used to assemble, firstly, two groups of elastic discs 3 are respectively installed into the two annular grooves, and then the connecting ends of the two valve seats 2 are respectively inserted into the two annular grooves, and then the sleeve 13 is split into two semi-tubular components 23, so that the two semi-tubular components 23 are respectively pressed toward the two valve seats 2 by radial embrace, and the elastic discs 3 are deformed by pressure, so that the two valve seats 2 are completely pressed into the corresponding annular grooves, and then the two semi-tubular components 23 are connected to form a sleeve 13, so that the plug 4, the valve seat 2 and the elastic disc 3 are all in the sleeve 13, and finally the device of the present invention is connected to the valve body 1, the driving screw 12 is connected to the threaded blind hole 18, so that the sleeve 13 is aligned with the upper end of the valve cavity hole 16, the square column 14 is fixed with a wrench, and the driving nut 11 is screwed, so that the plug 4 can be pressed into the valve cavity hole 16 through the driving screw 12.

[0045] Since the sleeve 13 is composed of two semi-tubular components 23 that are detachably connected and assembled, the sleeve 13 can be disassembled into two semi-tubular components 23 first, so that a sufficient space is formed between the two semi-tubular components 23, and the space is much larger than the sealing surface distance of the two valve seats 2 when the elastic disc 3 is not compressed, so as to facilitate the accommodation of the assembled cock 4 and the valve seat 2. After the two semi-tubular components 23 are connected to form the sleeve 13, the sleeve 13 is aligned with the valve cavity hole 16. Since the inner diameter of the sleeve 13 is smaller than the diameter of the valve cavity hole 16, the driving screw 12 is screwed, and under the top pressure of the driving screw 12, the cock 4 can be smoothly pressed into the valve cavity hole 16, effectively solving the problem that the valve plug of the cock valve is not easy to install. The present invention has a simple structure and is easy to operate.

[0046] When disassembling the plug valve, the reverse steps are adopted. It should be noted that in order to facilitate pulling the plug 4 from the valve cavity hole 16 into the sleeve 13, when assembling the sleeve 13, the two semi-tubular components 23 do not need to be connected too tightly, that is, a certain gap can be retained between the two semi-tubular components 23 so that the inner hole of the sleeve 13 is larger than the diameter of the valve cavity hole 16.

[0047] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A plug valve assembly device, the plug valve comprising a valve body (1), a plug (4) and two valve seats (2), the valve body (1) being provided with a valve cavity hole (16) extending vertically and a medium inlet and outlet hole (17) extending horizontally, the axis of the valve cavity hole (16) intersecting perpendicularly with the axis of the medium inlet and outlet hole (17), two valve covers (5) respectively closing the two ends of the valve cavity hole (16), the plug (4) comprising a drive shaft head (19), a plug body (20) and a positioning shaft head (21) coaxially connected in sequence from top to bottom, a threaded blind hole (18) being machined on the upper end surface of the drive shaft head (19), annular grooves being machined on both sides of the outer periphery of the plug body (20), and a horizontal A through opening and closing hole (24), a driving shaft head (19) passes through the upper valve cover (5), the driving shaft head (19) and the upper valve cover (5) are rotatably sealed, a positioning groove is provided on the upper end surface of the lower valve cover (5), the positioning shaft head (21) is rotatably matched with the positioning groove, the valve seat (2) is in a ring sleeve shape, the connecting end surfaces of the two valve seats (2) are respectively abutted against the groove bottoms of the two annular grooves through elastic discs (3), the sealing end surfaces of the two valve seats (2) are respectively rotatably sealed with the valve cavity hole (16), when the valve is opened, the opening and closing hole (24) is connected with the medium inlet and outlet hole (17) to form a medium flow channel, when the valve is closed, the two valve seats (2) respectively close the two sides of the medium inlet and outlet hole (17); Features: The assembly device comprises a base (6), a support stud (7), a pressure ring (8), a support plate (10), a drive screw (12) and a sleeve (13); the lower ends of a plurality of support studs (7) are respectively connected to the base (6); the upper ends of a plurality of support studs (7) are respectively connected to the support plate (10); the pressure ring (8) is respectively slidably matched with the plurality of support studs (7); a second nut (15) is provided on the support stud (7); a flange is provided on the outer periphery of the sleeve (13); a square column (14) which can be snap-fitted with a wrench is provided on the upper end of the drive screw (12); the drive screw (12) vertically passes through the support plate (10); the drive nut (11) is threadedly matched with the drive screw (12); the sleeve (13) is composed of two semi-tubular components (23) which are detachably connected and spliced; the inner diameter of the sleeve (13) is smaller than the inner diameter of the valve cavity hole (16); When assembling the plug valve, the driving nut (11) is located at the lower side of the support plate (10). First, the two semi-tubular components (23) respectively press the two valve seats (2) into the two annular grooves to compress and deform the two sets of elastic discs (3). Then, the two semi-tubular components (23) are connected to form a sleeve (13). Then, the base (6) is connected to the valve body (1) so that the lower end of the sleeve (13) passes through the base (6) and abuts against the valve body (1). The sleeve (13) is coaxial with the valve cavity hole (16), the lower end of the driving screw (12) is connected to the threaded blind hole (18), the second nut (15) is screwed, and a plurality of second nuts (15) press the pressure ring (8) onto the flange, and finally the square column (14) is fixed with a wrench to prevent the driving screw (12) from rotating, the driving nut (11) is screwed upward, the driving screw (12) is moved downward by using the thread principle, and the plug (4) is pressed into the valve cavity hole (16); When disassembling the plug valve, the driving nut (11) is located on the upper side of the supporting plate (10), and the base (6) is first connected to the valve body (1), so that the lower end of the sleeve (13) passes through the base (6) and abuts against the valve body (1), the sleeve (13) is coaxial with the valve cavity hole (16), the lower end of the driving screw (12) is connected to the threaded blind hole (18), and the second nut (15) is screwed. A plurality of second nuts (15) press the pressure ring (8) onto the flange, and then the square column (14) is fixed with a wrench to prevent the driving screw (12) from rotating, and the driving nut (11) is screwed downward, and the driving screw (12) is moved upward by using the thread principle, and the plug (4) is pulled into the sleeve (13), and then the assembly device is disassembled from the valve body (1), and finally the sleeve (13) is split into two semi-tubular components (23), and the plug (4) is taken out.

2. A plug valve plug assembly device according to claim 1, characterized in that: The lower end of the sleeve (13) is provided with a pointed ring structure (25), which is matched with the chamfered upper end of the valve cavity hole (16). When the plug valve is assembled, the pointed ring structure (25) is matched with the chamfered stopper at the upper end of the valve cavity hole (16).

3. A plug valve plug assembly device according to claim 1, characterized in that: A through hole is provided on the support plate (10), a driving nut (11) is connected to the support plate (10), and a driving screw rod (12) passes through the through hole on the support plate (10) and is threadably matched with the driving nut (11).

4. A plug valve plug assembly device according to claim 1, characterized in that: A third nut (22) is provided at the bottom of the driving screw rod (12). When the driving screw rod (12) is connected to the threaded blind hole (18), it is locked by the third nut (22).

5. A plug valve plug assembly device according to claim 1, characterized in that: The inner diameter of the valve cavity hole (16) is defined as φD3, and the inner diameter of the sleeve (13) is defined as φD2, and φD2 is 0.1 mm smaller than φD3.

6. A plug valve plug assembly device according to claim 1, characterized in that: The surface roughness of the inner hole of the sleeve (13) is less than or equal to Ra0.

2.

7. A plug valve plug assembly device according to claim 1, characterized in that: The valve body (1) is provided with a plurality of flange blind holes for connecting with the valve cover (5), the base (6) is composed of two connecting blocks (26), the bottom of the connecting block (26) is provided with a threaded column head (27), the threaded column heads (27) of the two connecting blocks (26) respectively cooperate with any two opposite threads in the plurality of flange blind holes on the upper side, so that the two connecting blocks (26) are respectively arranged on two opposite sides of the valve cavity hole (16), the number of the supporting studs (7) is two, and the lower ends of the supporting studs (7) are respectively connected to the two connecting blocks (26) accordingly.

8. A plug valve plug assembly device according to any one of claims 1 to 7, characterized in that: Two first nuts (9) are arranged on the top of the support stud (7), and the two first nuts (9) are respectively pressed against and locked with the upper and lower end surfaces of the support plate (10).

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