Top drive plug valve

Abstract

The invention relates to a top drive plug valve, and relates to the field of petroleum and natural gas drilling and well control equipment, a conical cylinder is coaxially arranged in a valve body and is close to the feeding end of the valve body, a valve element is close to the discharging end of the valve body, the conical cylinder and the side wall of the valve body define an annular cavity, and an inlet is formed in the position, close to the feeding end of the valve body, of the cavity; an inlet is formed in the valve body, an outlet is formed in the position close to the discharging end of the valve body, the inlet and the outlet are provided with a feeding one-way assembly and a discharging one-way assembly respectively, the feeding one-way assembly and the discharging one-way assembly enable fluid to flow from the inlet to the outlet of the cavity in a one-way mode, and the inner diameter of the conical cylinder is gradually reduced in the direction from the feeding end to the discharging end of the valve body. The top drive plug valve has the beneficial effects that the structural design is reasonable, the number of structural parts is small, stability is high, the application range is wide, the service life is long, and the opening and closing torque of the top drive plug valve under unbalanced pressure can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of oil and gas drilling and well control equipment, and in particular to a top drive plug valve. Background Art

[0002] The top drive plug valve is connected between the top drive main shaft and the protection joint. It is a control valve for opening and closing the channel inside the drill string in the drill string circulation system. Its function is to block the internal channel of the drill string when the formation pressure exceeds the static column pressure of the mud and the formation pressure pushes the mud to spray upward along the water hole of the drill string during the drilling process to avoid the occurrence of well kick and blowout accidents.

[0003] The top drive plug valve is divided into the top drive upper plug valve and the top drive lower plug valve. The structures of the two are basically the same, both of which are kelly drill stem valves with ball valve structure. Among them, the top drive upper plug valve is driven by a hydraulic actuator and opened and closed by the driller through the top drive control box; the top drive lower plug valve is a manual drill string safety valve, which is opened and closed by manually driving the knob with a wrench. When special working conditions occur, such as failure of hydraulic equipment or control panel, and the conditions for the hydraulic actuator to open and close the top drive upper plug valve are not met, the opening and closing torque of the plug valve is the key to determine whether the lower plug valve can be opened and closed manually. Since there are certain safety hazards in manually closing the valve, the closing torque needs to be evaluated before closing.

[0004] According to research, the torque that an average adult can normally output using a common wrench is 600N·m. When overflow occurs, during the process of closing the plug valve and ball valve, the channel area in the drill pipe is reduced, the pressure difference between the upper and lower parts of the valve core increases, and the friction torque becomes larger, which can easily lead to rotation failure and inability to close. Therefore, it is necessary to develop a top drive plug valve that can reduce torque.

[0005] Most of the research on top drive plug valves in China focuses on the mechanism analysis of the failure form of top drive plug valves and structural improvement measures, and there are few studies and analyses on the specific values ​​of the opening and closing torque under unbalanced pressure conditions. Foreign countries focus on the improvement of the structure of top drive plug valves and the research and improvement of the driving device of top drive plug valves. For example, the driving device of Canada Hi-Kalibre Company realizes the opening and closing of the top drive upper plug valve through a gear rack mechanism; the driving device of the American NOV company is driven by a hydraulic cylinder to drive the connecting rod to drive the sliding sleeve up and down, and at the same time drives the rocker arm assembly built into the sliding sleeve to rotate to realize the opening and closing of the top drive plug valve. Some manufacturers have also studied how to reduce the friction between the valve core and the valve seat. For example, Griffith Company added ear shafts on both sides of the ball valve, and the ear shafts were equipped with metal rolling radial bearings for straightening and reducing friction torque; Kelleyguard uses an automatic pressure balance channel to reduce the friction torque between the valve core and the valve seat and reduce the opening torque.

[0006] At present, the top drive plug valves used in the field have basically the same structure. Reducing the opening and closing torque of the ball valve generally starts with the surface treatment of the ball valve, reducing the friction coefficient of the ball valve surface, thereby reducing the opening and closing torque. When overflow occurs, the plug valve that reduces the surface roughness of the ball valve through the surface treatment process will not change the pressure on the valve core and valve seat, and the reduced opening and closing torque value is limited.

[0007] According to research, the pressure of the fluid inside the plug valve is an important factor affecting the torque required for its opening and closing. The greater the internal fluid pressure, the greater the pressure on the valve core, the greater the friction between the valve core and the ball seat, resulting in a greater torque required for opening and closing. Therefore, reducing the pressure of the fluid inside the plug valve is the key to reducing the closing torque. In response to this problem, the present invention proposes a top-driven plug valve, which reduces the pressure on the valve core by increasing the loss when the internal fluid is large, thereby reducing the torque required for the valve to close. Summary of the invention

[0008] The technical problem to be solved by the present invention is how to reduce the torque required when the valve core of a top drive plug valve is closed.

[0009] The technical solution of the present invention for solving the above technical problems is as follows: a top-driven plug valve comprises a valve body and a valve core arranged in the valve body, and also comprises a conical cylinder, wherein the conical cylinder is coaxially arranged in the valve body and is arranged close to the feed end of the valve body, the valve core is arranged close to the discharge end of the valve body, the conical cylinder and the side wall of the valve body form an annular cavity, the cavity has an inlet near the feed end of the valve body, and has an outlet near the discharge end of the valve body, the inlet and the outlet are respectively provided with a feed one-way component and a discharge one-way component, the feed one-way component and the discharge one-way component allow the fluid to flow unidirectionally from the inlet of the cavity to the outlet, and the inner diameter of the conical cylinder gradually decreases in the direction from the feed end to the discharge end of the valve body.

[0010] The beneficial effect of the present invention is that when the bottom hole pressure increases sharply due to accidents such as well kick and blowout, the feed one-way component is pushed open by the pressure, and a part of the fluid flows into the cavity, and then the discharge one-way component is pushed open, and flows out of the cavity, and the fluid in the other part of the valve body flows normally, creating an internal fluid vortex and counteraction, thereby reducing the fluid pressure inside the top drive plug valve, reducing the pressure between the valve core and the valve body, and then reducing the friction when the valve core rotates, and reducing the torque required to close the valve. This structure is relatively simple to process and can be widely used in the field of oil and gas drilling. Especially for the situation that the top drive plug valve is under unbalanced pressure conditions due to complex downhole working conditions and harsh well site environment. In addition, the pressure reduction between the valve core and the upper valve seat can reduce the degree of damage to the ball valve structure and extend its service life. Compared with the prior art, the present invention has a reasonable structural design, fewer structural parts, high stability, a wide range of applications, and a long service life, and can effectively reduce the opening and closing torque of the top drive plug valve under unbalanced pressure.

[0011] Among them, the inner wall of the cone is set to be conical. According to the Bernoulli principle, the outlet with a smaller diameter has a small flow area, a fast flow rate and a low pressure, while the inlet with a larger diameter has a large flow area, a slow flow rate and a high pressure. Therefore, the pressure at the inlet is greater than the pressure at the outlet, which can ensure that there is a pressure difference between the inlet and outlet of the cavity, so that the fluid can smoothly enter the cavity.

[0012] Based on the above technical solution, the present invention can also be improved as follows.

[0013] Furthermore, the inlet and the outlet are both arranged on the cone.

[0014] Furthermore, the outer diameter of the cone gradually decreases along the direction from the feed end to the discharge end of the valve body.

[0015] The beneficial effect of adopting the above further scheme is that the side wall of the cone cylinder facing the cavity is tapered, so that the outlet of the cavity is inclined, so that the fluid flowing out of the cavity and the original fluid of the valve body collide at a certain angle, and the fluid pressure reduction effect is significant.

[0016] Furthermore, the feed one-way component includes a compression spring and a sliding plug, one end of the compression spring is fixedly connected to the valve body, and the other end is fixedly connected to the sliding plug, and the sliding plug is slidably disposed in the inlet.

[0017] Furthermore, the sliding plug is provided with a first one-way tooth, and the cavity is provided with a second one-way tooth, the first one-way tooth and the second one-way tooth are meshed, and the sliding plug can move unidirectionally into the cavity.

[0018] The beneficial effect of adopting the above further solution is that the sliding plug can only be opened in one direction and cannot be reset when the fluid pressure changes. Since the pressure difference between the inlet and the outlet is unstable, if an ordinary resettable one-way valve is set at the inlet, the opening and closing of the inlet valve will be unstable, affecting the smooth entry of the fluid into the cavity. If a sliding plug is set to be opened only in one direction, it can ensure that the fluid enters the cavity smoothly and the pressure is reduced.

[0019] Furthermore, the discharge one-way component is a one-way valve.

[0020] The beneficial effect of adopting the above further solution is that the structure of the finished one-way valve is more stable and easy to install.

[0021] Furthermore, the top-driven plug valve also includes an upper ball seat, which is fixed in the valve body, and the valve core is rotatably installed in the upper ball seat.

[0022] The beneficial effect of adopting the above further solution is that the upper ball seat is used to limit the position of the valve core, so that the valve core can be assembled reliably.

[0023] Furthermore, the top drive plug valve also includes a split retaining ring, which is fixedly connected to the inner wall of the valve body and abuts against one axial end of the upper ball seat.

[0024] The beneficial effect of adopting the above further solution is that the spliced ​​retaining ring is used in the axial position of the upper ball seat, which facilitates the installation of the upper ball seat.

[0025] Furthermore, the top-driven plug valve also includes a handle, one end of which is fixedly connected to the valve core, and the other end of which extends out of the side wall of the valve body.

[0026] The beneficial effect of adopting the above further solution is that the other end of the handle is used to connect to a matching wrench, and by turning the wrench, the valve core is rotated at a fixed position to achieve opening and closing of the valve.

[0027] Furthermore, the feed end and the discharge end of the valve body have a lower joint and an upper joint respectively.

[0028] The beneficial effect of adopting the above further solution is that the valve body is connected to the pipeline through the lower joint and the upper joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A half-section view of the top drive plug valve of the present invention;

[0030] Figure 2 It is a schematic diagram of the fluid flow direction of the top drive plug valve of the present invention;

[0031] Figure 3 It is a left side view of the cone of the present invention;

[0032] Figure 4It is a schematic diagram of the matching structure of the first one-way tooth and the second one-way tooth.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. Upper joint; 2. Spliced ​​retaining ring; 3. Upper ball seat; 4. Handle; 5. Valve core; 6. Valve body; 7. One-way valve; 8. Conical cylinder; 9. Cavity; 10. Compression spring; 11. Sliding plug; 12. Lower joint; 13. Inlet; 14. Outlet. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] like Figure 1-Figure 4 As shown, this embodiment provides a top-driven plug valve, including a valve body 6 and a valve core 5 arranged in the valve body 6, and also includes a tapered cylinder 8, the tapered cylinder 8 is coaxially arranged in the valve body 6 and arranged near the feed end of the valve body 6, the valve core 5 is arranged near the discharge end of the valve body 6, the tapered cylinder 8 and the side wall of the valve body 6 form an annular cavity 9, the cavity 9 has an inlet 13 near the feed end of the valve body 6, and has an outlet 14 near the discharge end of the valve body 6, the inlet 13 and the outlet 14 are respectively provided with a feed one-way component and a discharge one-way component, the feed one-way component and the discharge one-way component allow the fluid to flow unidirectionally from the inlet 13 of the cavity 9 to the outlet 14, and the inner diameter of the tapered cylinder 8 gradually decreases along the direction from the feed end to the discharge end of the valve body 6.

[0037] When the bottom hole pressure increases sharply due to accidents such as well kick and blowout, the feed one-way component is pushed open by the pressure, and a part of the fluid flows into the cavity 9, and then the discharge one-way component is pushed open, flowing out of the cavity 9, and the other part of the normal fluid flowing in the valve body 6 is offset, creating an internal fluid vortex and offset, thereby reducing the fluid pressure inside the top drive plug valve, reducing the pressure between the valve core 5 and the valve body 6, and then reducing the friction when the valve core 5 rotates, and reducing the torque required to close the valve. This structure is relatively simple to process and can be widely used in the field of oil and gas drilling. Especially for the situation where the top drive plug valve is under unbalanced pressure conditions due to complex downhole working conditions and harsh well site environment. In addition, the reduction in pressure between the valve core and the upper valve seat can reduce the degree of damage to the ball valve structure and extend its service life. Compared with the prior art, the present invention has a reasonable structural design, fewer structural parts, high stability, a wide range of applications, and a long service life, and can effectively reduce the opening and closing torque of the top drive plug valve under unbalanced pressure.

[0038] Among them, the inner wall of the cone 8 is set to be conical. According to the Bernoulli principle, the flow area at the outlet 14 with a smaller diameter is small, the flow velocity is fast and the pressure is small, and the flow area at the inlet 13 with a larger diameter is large, the flow velocity is slow and the pressure is high. Therefore, the pressure at the inlet 13 is greater than the pressure at the outlet 14, which can ensure that there is a pressure difference between the inlet 13 and the outlet 14 of the cavity 9, so that the fluid can smoothly enter the cavity 9.

[0039] The inner diameter of the cone 8 gradually decreases from the feed end to the discharge end. Optionally, the inner wall of the cone 8 is tapered as a whole, or the cone 8 is tapered from the feed end to the middle, and the discharge end is cylindrical connected to the cone.

[0040] Optionally, multiple one-way feed components are provided along the circumference of the cone 8 .

[0041] Optionally, multiple one-way discharge components are provided along the circumference of the cone 8 .

[0042] On the basis of any of the above solutions, the inlet 13 and the outlet 14 are both arranged on the cone 8 .

[0043] On the basis of any of the above solutions, the outer diameter of the conical cylinder 8 gradually decreases along the direction from the feed end to the discharge end of the valve body 6.

[0044] The outlet 14 is perpendicular to the side wall of the cone cylinder 8, and the side wall of the cone cylinder 8 facing the cavity 9 is tapered, so the outlet 14 of the cavity 9 is inclined, so that the fluid flowing out of the cavity 9 and the original fluid of the valve body 6 collide at a certain angle, and the fluid pressure reduction effect is significant.

[0045] Based on any of the above schemes, the feed one-way component includes a compression spring 10 and a sliding plug 11, one end of the compression spring 10 is fixedly connected to the valve body 6, and the other end is fixedly connected to the sliding plug 11, and the sliding plug 11 is slidably arranged in the inlet 13.

[0046] Based on any of the above solutions, Figure 4 As shown, the sliding plug 11 is provided with a first one-way tooth, and the cavity 9 is provided with a second one-way tooth. The first one-way tooth and the second one-way tooth are meshed, and the sliding plug 11 can move unidirectionally into the cavity 9.

[0047] The sliding plug 11 can only be opened in one direction and cannot be reset when the pressure of the fluid changes. Since the pressure difference between the inlet 13 and the outlet 14 is unstable, if a common resettable one-way valve is set at the inlet 13, the opening and closing of the valve at the inlet 13 will be unstable, affecting the smooth entry of the fluid into the cavity 9. If the sliding plug 11 is set to be opened only in one direction, it can ensure that the fluid enters the cavity smoothly and the pressure is reduced.

[0048] Specifically, the first one-way tooth includes an inclined surface and a straight surface connected to each other, and the straight surface is perpendicular to the axis of the sliding plug 11. The second one-way tooth is a tooth-shaped structure that interlocks with the first one-way tooth. The inclined surfaces of the first one-way tooth and the second one-way tooth abut against each other, and can move relatively along the inclined surfaces; the straight surfaces of the first one-way tooth and the second one-way tooth abut against each other, and realize the limit of the movement of the sliding plug 11 toward the outside of the cavity 9.

[0049] Based on any of the above solutions, the one-way discharge component is a one-way valve 7.

[0050] The finished one-way valve 7 has a more stable structure and is easy to install.

[0051] On the basis of any of the above solutions, the top drive plug valve further includes an upper ball seat 3 , wherein the upper ball seat 3 is fixed in the valve body 6 , and the valve core 5 is rotatably installed in the upper ball seat 3 .

[0052] On the basis of any of the above solutions, the upper ball seat 3 is used to limit the position of the valve core 5 so that the valve core 5 can be assembled reliably.

[0053] On the basis of any of the above solutions, the top drive plug valve further comprises a split retaining ring 2 , which is fixedly connected to the inner wall of the valve body 6 and abuts against one axial end of the upper ball seat 3 .

[0054] The spliced ​​retaining ring 2 is used for the axial position of the upper ball seat 3 to facilitate the installation of the upper ball seat 3.

[0055] On the basis of any of the above solutions, the top-driven plug valve further includes a handle 4 , one end of which is fixedly connected to the valve core 5 , and the other end of which extends out of the side wall of the valve body 6 .

[0056] The other end of the handle 4 is used to connect to a matching spanner. By turning the spanner, the valve core 5 is rotated at a fixed position to open and close the valve.

[0057] On the basis of any of the above solutions, the feed end and the discharge end of the valve body 6 have a lower joint 12 and an upper joint 1 respectively.

[0058] The valve body 6 is connected to the pipeline via the lower joint 12 and the upper joint 1 .

[0059] In one of the specific embodiments, the conical cylinder 8 isolates the cavity 9 from the middle channel of the valve body 6, and the cavity 9 is filled with air. Three one-way valves 7 are arranged on the conical cylinder 8 in a circumferentially uniformly distributed manner according to the position shown in the figure. The one-way valves 7 only allow the fluid in the cavity 9 to flow to the middle channel, and the pressure required to open is extremely small. Three sets of compression springs 10 and sliding plugs 11 are arranged in combination, which are evenly distributed circumferentially at the feed end of the conical cylinder, as shown in the position in the figure. The sliding plug 11 is only allowed to slide in the direction of spring compression, that is, when the compression spring 10 is further compressed, the sliding plug 11 slides in the axial compression direction of the spring, and once "opened", it cannot be reset, so that the middle channel and the cavity 9 are in a connected state.

[0060] Figure 1 The valve core 5 is fully opened, and the torque reduction structure (check valve 7, cavity 9, compression spring 10 and sliding plug 11) is not in effect. When the fluid pressure inside the plug valve is normal and lower than the threshold value of compression spring 10, compression spring 10 will not be compressed and sliding plug 11 will not slide. The fluid flows out directly from the middle channel. At this time, compression spring 10 and sliding plug 11 have not changed, so the fluid will not enter cavity 9.

[0061] Figure 2 The valve is fully opened and the torque reduction structure has taken effect. The arrow indicates the flow of the fluid. When the internal fluid pressure is higher than the threshold, the compression spring 10 will be compressed, the sliding plug 11 will slide unidirectionally in the compression direction, the middle channel will be connected with the cavity 9, and the fluid in the cavity 9 will flow out of the one-way valve 7 and collide with the fluid in the middle channel of the valve body 6, thereby reducing the fluid pressure inside the top drive plug valve, reducing the pressure between the valve core 5 and the upper ball seat 3, and then reducing the friction when the valve core 5 rotates, reducing the torque required to close the valve.

[0062] It should be noted that when a dangerous accident occurs, the pressure in the top drive plug valve will increase sharply, the torque reduction structure will start, and the top drive plug valve generally needs to be closed urgently. After the accident is handled, the sliding plug 11 can be restored during equipment maintenance (for example, the sliding plug 11 is removed and reinstalled into the inlet 13 from the middle channel).

[0063] The use of top drive plug valve includes at least the following two working conditions:

[0064] Working condition 1: Achieve pressure reduction when abnormal working conditions occur.

[0065] When abnormal conditions such as well kick and blowout occur, the fluid pressure in the middle channel of the plug valve rises sharply, and the compression spring 10 is compressed at this time, and the fluid enters the cavity 9 from the sliding plug 11. Since the pressure at the sliding plug 11 is greater than the pressure at the one-way valve 7, the fluid flows out from the one-way valve 7. Vortex and backflow are caused at the one-way valve 7 in the middle channel, so that the fluid pressure passing through the valve core 5 is lower than the fluid pressure at the sliding plug 11, which helps to reduce the torque when closing the valve core 5.

[0066] Condition 2: Achieve pressure reduction during valve closing.

[0067] In the process of the valve core 5 being fully opened and fully closed, rotating the valve core 5 will gradually reduce the flow area of ​​the middle channel, gradually increase the internal pressure below the valve, and gradually increase the required torque. When the pressure exceeds a certain value, the compression spring 10 and the sliding plug 11 will be compressed, connecting the cavity 9 and the middle channel, which is consistent with the principle in working condition 1. Finally, the internal pressure is reduced and the torque required to close the valve is reduced.

[0068] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying 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 a limitation on the present invention.

[0069] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0071] 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 direct connection, or an indirect connection 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.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A top drive plug valve, comprising a valve body (6) and a valve core (5) arranged in the valve body (6), characterized in that: The valve body (6) further comprises a conical cylinder (8), wherein the conical cylinder (8) is coaxially arranged in the valve body (6) and is arranged near the feed end of the valve body (6); the valve core (5) is arranged near the discharge end of the valve body (6); the conical cylinder (8) and the side wall of the valve body (6) form an annular cavity (9); the cavity (9) has an inlet (13) near the feed end of the valve body (6) and an outlet (14) near the discharge end of the valve body (6); the inlet (13) and the outlet (14) are respectively provided with a feed one-way component and a discharge one-way component; the feed one-way component and the discharge one-way component enable the fluid to flow in one direction from the inlet (13) of the cavity (9) to the outlet (14); the inner diameter of the conical cylinder (8) gradually decreases along the direction from the feed end to the discharge end of the valve body (6).

2. A top drive plug valve according to claim 1, characterized in that: The inlet (13) and the outlet (14) are both arranged on the cone (8).

3. A top drive plug valve according to claim 2, characterized in that: The outer diameter of the conical cylinder (8) gradually decreases along the direction from the feed end to the discharge end of the valve body (6).

4. A top drive plug valve according to claim 1, characterized in that: The feed one-way component comprises a compression spring (10) and a sliding plug (11), one end of the compression spring (10) is fixedly connected to the valve body (6), and the other end is fixedly connected to the sliding plug (11), and the sliding plug (11) is slidably arranged in the inlet (13).

5. A top drive plug valve according to claim 4, characterized in that: The sliding plug (11) is provided with a first one-way tooth, and the cavity (9) is provided with a second one-way tooth. The first one-way tooth and the second one-way tooth are meshed, and the sliding plug (11) can move unidirectionally into the cavity (9).

6. A top drive plug valve according to claim 1, characterized in that: The one-way discharge component is a one-way valve (7).

7. A top drive plug valve according to claim 1, characterized in that: It also comprises an upper ball seat (3), wherein the upper ball seat (3) is fixed in the valve body (6), and the valve core (5) is rotatably mounted in the upper ball seat (3).

8. A top drive plug valve according to claim 7, characterized in that: It also includes a split retaining ring (2), which is fixedly connected to the inner wall of the valve body (6) and abuts against one axial end of the upper ball seat (3).

9. A top drive plug valve according to claim 1, characterized in that: It also comprises a handle (4), one end of which is fixedly connected to the valve core (5), and the other end of which extends out of the side wall of the valve body (6).

10. A top drive plug valve according to any one of claims 1 to 9, characterized in that: The inlet end and outlet end of the valve body (6) are respectively provided with a lower joint (12) and an upper joint (1).

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