An automatically sealable wellhead valve device for fracturing and gas production

Abstract

The present invention discloses a fracturing gas production wellhead valve device capable of automatic sealing, which includes a transmission actuator and a gate valve assembly. The gate valve assembly includes a valve body. The transmission actuator and the valve body are fixedly connected through a bracket. A valve seat sealing ring is detachably installed inside the valve body. The top of the valve body is detachably installed with a valve cover through a thread group. A valve rod member that is in transmission connection with the transmission actuator is slidably connected inside the valve cover. The present invention relates to the technical field of valves. The fracturing gas production wellhead valve device capable of automatic sealing can effectively solve the problems in the prior art. The main function of the wellhead gate valve is to control the opening and closing of the fluid in the pipeline to ensure the safety and stability of the production process. However, the wellhead gate valve is most likely to rust after being exposed to moisture, and the valve rod may malfunction after a long time. Secondly, when the transmission actuator is damaged, the valve rod will not be able to move downward, and the gate plate will not be able to close, resulting in fluid backflow or gas leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a fracturing gas production wellhead valve device with automatic sealing. Background Art

[0002] A wellhead gate valve is a common type of valve, which is widely used in industries such as petroleum, natural gas, chemical engineering, and metallurgy. Its main function is to control the fluid in the pipeline so that it can flow smoothly or stop flowing. The working principle of the wellhead gate valve is to control the flow of the fluid in the pipeline by moving the gate plate up and down. When the gate plate is in the closed state, the fluid cannot pass through the valve, and at this time, the fluid in the pipeline is in a stopped state. When the gate plate is in the open state, the fluid can flow smoothly through the valve, and at this time, the fluid in the pipeline is in a flowing state. The opening and closing of the wellhead gate valve are usually realized by a transmission actuator.

[0003] A wellhead gate valve is a valve that controls the flow of fluid in the pipeline by moving the gate plate up and down. It is usually installed at the wellhead of the pipeline, so it is named the wellhead gate valve. The main function of the existing wellhead gate valve is to control the opening and closing of the fluid in the pipeline to ensure the safety and stability of the production process. However, the wellhead gate valve is most likely to rust after being exposed to moisture, and the valve stem may malfunction after a long time. Secondly, when the transmission actuator is damaged, the valve stem will also be unable to move downward, and the gate plate will then be unable to close, resulting in fluid backflow or gas leakage. Summary of the Invention

[0004] Technical Problems to be Solved

[0005] In view of the above-mentioned disadvantages of the prior art, the present invention provides a fracturing gas production wellhead valve device with automatic sealing, which can effectively solve the problems in the prior art that the main function of the wellhead gate valve is to control the opening and closing of the fluid in the pipeline to ensure the safety and stability of the production process, but the wellhead gate valve is most likely to rust after being exposed to moisture, and the valve stem may malfunction after a long time. Secondly, when the transmission actuator is damaged, the valve stem will also be unable to move downward, and the gate plate will then be unable to close, resulting in fluid backflow or gas leakage.

[0006] Technical Solutions

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] The present invention provides a fracturing gas production wellhead valve device with automatic sealing, including:

[0009] A transmission actuator;

[0010] Gate valve assembly, the gate valve assembly includes a valve body, the transmission actuator and the valve body are fixedly connected through a bracket, a valve seat seal ring is detachably installed inside the valve body, the top of the valve body is detachably installed with a valve cover through a thread group, a valve rod member that is slidably connected inside the valve cover and is in transmission connection with the transmission actuator is provided, and a gate plate that is in sealing contact with the sealing surface of the valve seat seal ring is fixedly connected to the bottom end of the valve rod member;

[0011] Among them, the main body of the valve rod member adopts a split structure, the valve rod member includes an upper valve rod and a lower valve rod, the top end of the upper valve rod is in transmission connection with the transmission actuator, the bottom end of the lower valve rod is fixedly connected to the gate plate, and a protective member for adjusting the position of the lower valve rod is arranged inside the valve body;

[0012] Among them, the sealing surface of the valve seat seal ring is designed at an oblique angle with respect to the vertical center line of the valve body.

[0013] Furthermore, the inside of the upper valve rod adopts a hollow design, the bottom end of the upper valve rod is fixedly communicated with a connecting pipe, and round holes are formed on the circumferential outer surface of the connecting pipe.

[0014] Furthermore, an inner rod that slides on the inner wall of the connecting pipe is fixedly connected to the top end of the lower valve rod, and the top end of the inner rod penetrates through the connecting pipe and extends into the upper valve rod. An inner cavity is formed inside the inner rod, a reciprocating block is slidably connected to the inner wall of the inner cavity, a return spring connected to the inner wall of the inner cavity is arranged on the outer surface of the reciprocating block, a sleeve ring is fixedly connected to the side of the reciprocating block away from the return spring, and a limiting ball that is engaged with the inner wall of the round hole is rotatably installed on the inner side of the sleeve ring.

[0015] Furthermore, an adjusting ring is rotatably connected to the circumferential outer surface of the upper valve rod through an annular track, and the adjusting ring is sleeved on the circumferential outer surface of the connecting pipe. An arc-shaped concave block that is in spherical contact with the limiting ball is fixedly connected to the inner wall of the adjusting ring, and an adjusting convex block is fixedly connected to the circumferential outer surface of the adjusting ring.

[0016] Furthermore, the protective member includes a counterweight plate, the circumferential outer surface of the counterweight plate is in contact with the inner wall of the valve body, a support block that is in contact with the lower surface of the counterweight plate is fixedly connected to the inner wall of the valve body, a toothed plate is fixedly connected to the upper surface of the counterweight plate, a rotating plate is rotatably connected to the upper surface of the toothed plate through a rotating groove, a sealing plate fixedly connected to the inner wall of the valve body is arranged above the toothed plate, and a strong spring connected to the lower surface of the sealing plate is arranged on the upper surface of the rotating plate.

[0017] Furthermore, the valve cover, sealing plate, rotating plate, tooth plate, counterweight plate and support block are arranged in sequence from top to bottom, the lower surface of the counterweight plate is provided with an adjustment groove close to the outer surface of the adjustment protrusion, the top end of the upper valve stem passes through the counterweight plate, tooth plate, rotating plate, sealing plate, valve cover in sequence and extends to the outside, and the circumferential outer surface of the counterweight plate is provided with a descending groove that fits with the support block.

[0018] Furthermore, a drive box is provided on the outer surface of the valve body, the output end of the drive box is meshedly connected with a gear and a toothed plate, and the outer surface of the gate plate is slidably connected with a sliding groove on the inner wall of the valve body through a guide block.

[0019] Beneficial Effects

[0020] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0021] The present invention is provided with a valve seat sealing ring, a valve stem, a gate plate and a protective part. The drive box is started, and the servo motor inside the drive box rotates slowly through the gear meshing transmission tooth plate, driving the counterweight plate to rotate slowly along the upper surface of the support block. At the same time, the adjusting groove drives the adjusting protrusion to rotate slowly and synchronously, and drives the arc-shaped concave block to rotate slowly and synchronously. The arc surface of the arc-shaped concave block begins to squeeze the limiting ball. Since the limiting ball can only perform "horizontal rotation", the friction between the arc-shaped concave block and the limiting ball is greatly reduced. The limiting ball drives the sleeve ring and the reciprocating block to move into the built-in cavity until the limiting ball is separated from the circular hole. Under the common gravity of the lower valve stem and the gate plate, the gate plate begins to fall freely until the gate plate fits with the valve seat sealing ring. As the counterweight plate rotates further slowly, the descending groove on the counterweight plate begins to slowly fit the support block. When the two are completely overlapped, the counterweight plate is driven to fall rapidly under the strong force of the strong spring. The adjusting groove of the counterweight plate passes over the adjusting ring, and the gate plate is quickly pressed downward as a whole, so that the gate plate and the valve seat sealing ring are completely closed, realizing automatic sealing and avoiding fluid backflow or gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a three-dimensional partial cross-section of a gate valve assembly according to an embodiment of the present invention;

[0025] Figure 3 Schematic structural diagram of the counterweight plate and the rotating plate separated three-dimensionally in the embodiment of the present invention;

[0026] Figure 4 Schematic structural diagram of a three-dimensional partial section of the valve body in the embodiment of the present invention;

[0027] Figure 5 Schematic structural diagram of the regulating ring and the regulating groove combined three-dimensionally in the embodiment of the present invention;

[0028] Figure 6 Schematic structural diagram of the valve rod member and the gate plate three-dimensionally in the embodiment of the present invention;

[0029] Figure 7 Schematic structural diagram of the regulating ring and the upper valve rod separated three-dimensionally in the embodiment of the present invention;

[0030] Figure 8 Schematic structural diagram of the upper valve rod and the lower valve rod separated three-dimensionally in the embodiment of the present invention.

[0031] The reference numerals in the figure respectively represent: 1, transmission actuator; 2, gate valve assembly; 21, valve body; 211, support block; 212, sealing plate; 22, valve seat sealing ring; 23, valve cover; 24, valve rod member; 241, upper valve rod; 2411, connecting pipe; 2412, round hole; 2413, regulating ring; 2414, arc-shaped concave block; 2415, regulating convex block; 242, lower valve rod; 2421, built-in rod; 2422, built-in cavity; 2423, reciprocating block; 2424, return spring; 2425, collar; 2426, limit ball; 25, gate plate; 26, protective member; 261, counterweight plate; 2611, regulating groove; 2612, descending groove; 262, toothed plate; 263, rotating plate; 264, strong spring; 3, drive box. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] The present invention will be further described below with reference to the embodiments.

[0034] Embodiment:

[0035] Please refer to Figures 1 - 8 , the present invention provides a technical solution: a fracturing gas production wellhead valve device capable of automatic sealing, comprising:

[0036] Transmission actuator 1;

[0037] Gate valve assembly 2, the gate valve assembly 2 includes a valve body 21, the transmission actuator 1 and the valve body 21 are fixedly connected through a bracket, a valve seat seal ring 22 is detachably installed inside the valve body 21, the top end of the valve body 21 is detachably installed with a valve cover 23 through a thread group, a valve rod member 24 drivingly connected to the transmission actuator 1 is slidably connected inside the valve cover 23, and a gate plate 25 that fits the sealing surface of the valve seat seal ring 22 is fixedly connected to the bottom end of the valve rod member 24;

[0038] Among them, the main body of the valve rod member 24 adopts a split structure, the valve rod member 24 includes an upper valve rod 241 and a lower valve rod 242, the top end of the upper valve rod 241 is drivingly connected to the transmission actuator 1, the bottom end of the lower valve rod 242 is fixedly connected to the gate plate 25, and a protective member 26 for adjusting the position of the lower valve rod 242 is arranged inside the valve body 21;

[0039] Among them, the sealing surface of the valve seat seal ring 22 is designed at an oblique angle with the vertical center line of the valve body 21 to prevent the gate plate 25 from being stuck when the temperature changes.

[0040] The inside of the upper valve rod 241 adopts a hollow design, the bottom end of the upper valve rod 241 is fixedly communicated with a connecting pipe 2411, and circular holes 2412 are opened on the circumferential outer surface of the connecting pipe 2411.

[0041] The top end of the lower valve rod 242 is fixedly connected with an inner rod 2421 that slides on the inner wall of the connecting pipe 2411, and the top end of the inner rod 2421 penetrates through the connecting pipe 2411 and extends into the upper valve rod 241. An inner cavity 2422 is opened inside the inner rod 2421, a reciprocating block 2423 is slidably connected to the inner wall of the inner cavity 2422, a return spring 2424 connected to the inner wall of the inner cavity 2422 is arranged on the outer surface of the reciprocating block 2423, a collar 2425 is fixedly connected to the side of the reciprocating block 2423 away from the return spring 2424, and a limiting ball 2426 that engages with the inner wall of the circular hole 2412 is rotatably installed on the inner side of the collar 2425.

[0042] The circumferential outer surface of the upper valve rod 241 is rotatably connected with an adjusting ring 2413 through an annular track, and the adjusting ring 2413 is sleeved on the circumferential outer surface of the connecting pipe 2411. An arc-shaped concave block 2414 that fits the spherical surface of the limiting ball 2426 is fixedly connected to the inner wall of the adjusting ring 2413, and an adjusting convex block 2415 is fixedly connected to the circumferential outer surface of the adjusting ring 2413.

[0043] The protective member 26 includes a counterweight plate 261. The circumferential outer surface of the counterweight plate 261 is in contact with the inner wall of the valve body 21. A support block 211 that is in contact with the lower surface of the counterweight plate 261 is fixedly connected to the inner wall of the valve body 21. A toothed plate 262 is fixedly connected to the upper surface of the counterweight plate 261. A rotating plate 263 is rotatably connected to the upper surface of the toothed plate 262 through a rotating groove. Above the toothed plate 262, there is a sealing plate 212 fixedly connected to the inner wall of the valve body 21. A strong spring 264 connecting the upper surface of the rotating plate 263 to the lower surface of the sealing plate 212 is arranged on the upper surface of the rotating plate 263.

[0044] The valve cover 23, the sealing plate 212, the rotating plate 263, the toothed plate 262, the counterweight plate 261, and the support block 211 are arranged in sequence from top to bottom. An adjustment groove 2611 that is close to the outer surface of the adjustment convex block 2415 is formed on the lower surface of the counterweight plate 261. The top end of the upper valve stem 241 sequentially penetrates through the counterweight plate 261, the toothed plate 262, the rotating plate 263, the sealing plate 212, the valve cover 23 and extends to the outside. A descending groove 2612 that is in contact with the support block 211 is formed on the circumferential outer surface of the counterweight plate 261.

[0045] A drive box 3 is arranged on the outer surface of the valve body 21. The output end of the drive box 3 is meshed with the toothed plate 262 through a gear. The outer surface of the gate plate 25 is slidably connected to the inner wall chute of the valve body 21 through a guide block.

[0046] Reference Figures 1 - 8 , the wellhead gate valve is a valve that controls the fluid flow in the pipeline by moving the gate plate up and down. It is usually installed at the wellhead of the pipeline, so it is named the wellhead gate valve. The main function of the existing wellhead gate valve is to control the opening and closing of the fluid in the pipeline to ensure the safety and stability of the production process. However, the wellhead gate valve is most likely to rust after being exposed to moisture. After a long time, the valve stem may malfunction (the exposed valve stem is prone to oxidation and corrosion). Secondly, when the transmission actuator is damaged, the valve stem will also be unable to move downward, and the gate plate will not be able to close, resulting in fluid backflow or gas leakage;

[0047] In order to overcome the above-mentioned defects, the present invention designs a fracturing gas production wellhead valve device with automatic sealing.

[0048] When the transmission actuator 1 and the valve rod member 24 are normal:

[0049] Initially, the valve rod member 24 is a complete whole. The built-in rod 2421 on the lower valve rod 242 extends into the upper valve rod 241. The bottom end of the coupling pipe 2411 abuts against the end face of the lower valve rod 242. At the same time, the limiting ball 2426 is under the elastic force of the return spring 2424, and the limiting ball 2426 is engaged in the round hole 2412, so that the upper valve rod 241, the coupling pipe 2411, the built-in rod 2421, the lower valve rod 242, and the limiting ball 2426 are combined into a whole. In order to further improve the bonding strength between the upper valve rod 241 and the lower valve rod 242, the limiting ball 2426 of the present application is provided with a circular groove on its spherical surface for rotatably installing a collar 2425. First, it can ensure that under the elastic force of the return spring 2424, the limiting ball 2426 can be normally inserted into the round hole 2412. Second, within the space enclosed by the collar 2425, the limiting ball 2426 can only perform "horizontal rotation" and cannot perform "vertical rotation", which can prevent the limiting ball 2426 from rotating vertically out of the round hole 2412 under the action of the gravity of the lower valve rod 242 (including the gate plate 25). The bonding force between the limiting ball 2426 and the round hole 2412 only needs to be able to overcome the lifting force of the gate plate 25. During the normal up and down movement of the valve rod member 24 as a whole, there is no interference between the valve rod member 24 and the protective member 26, and the protective member 26 does not participate in the normal operation of the valve rod member 24.

[0050] Valve opening: By starting the drive actuator 1, the output end of the drive actuator 1 drives the valve rod member 24 to move upward along the inside of the valve cover 23, driving the gate plate 25 to move upward along the sealing surface of the valve seat seal ring 22. The fluid can flow smoothly through the flow channel of the valve body 21. At this time, the fluid in the flow channel is in a flowing state until the gate plate 25 moves upward completely out of the flow channel of the valve body 21. At this time, the adjusting ring 2413 and the adjusting convex block 2415 jointly move into the space enclosed by the adjusting groove 2611 (the adjusting groove 2611 is in the vertical direction and the notch is a through-hole type). The outer surface of the gate plate 25 is slidably connected to the inner wall chute of the valve body 21 through a guide block to prevent the gate plate 25 from rotating and shifting.

[0051] Valve closing: By starting the drive actuator 1, the output end of the drive actuator 1 drives the valve rod member 24 to move downward along the inside of the valve cover 23, driving the outer surface of the gate plate 25 to slide downward through the guide block and the inner wall chute of the valve body 21. The outer surface of the gate plate 25 moves downward along the sealing surface of the valve seat seal ring 22 until the two are completely sealed and fitted to prevent the fluid from passing through.

[0052] When the drive actuator 1 or the valve rod member 24 is damaged:

[0053] As can be seen from the above, the opening and closing of the valve completely depend on the positional relationship between the gate plate 25 and the valve seat sealing ring 22. When the two are completely closed, the fluid passage is blocked. When the two are completely separated, the flow passage of the valve body 21 is opened, and the fluid can flow smoothly. When the drive actuator 1 or the valve rod member 24 is damaged, the gate plate 25 and the valve seat sealing ring 22 cannot be closed again, and there is a risk of fluid backflow or gas leakage at this time. In contrast, in this application, only need to start the drive box 3 (the box body adopts a sealed structure and is basically not used usually, only used in case of emergency). The servo motor inside it drives the toothed plate 262 to rotate slowly through gear meshing, driving the counterweight plate 261 to rotate slowly along the upper surface of the support block 211 (usually, under the elastic force of the strong spring 264, the counterweight plate 261 always remains stationary), and at the same time, the toothed plate 262 rotates slowly around the rotating plate 263. During the slow rotation of the counterweight plate 261, the adjustment groove 2611 drives the adjustment convex block 2415 to rotate slowly synchronously, driving the adjustment ring 2413 to rotate slowly around the annular track of the upper valve rod 241, and driving the arc-shaped concave block 2414 to rotate slowly synchronously. During the rotation of the arc-shaped concave block 2414, the arc surface of the arc-shaped concave block 2414 begins to squeeze the limit ball 2426. Since the limit ball 2426 can only perform "horizontal rotation", the friction between the arc-shaped concave block 2414 and the limit ball 2426 is greatly reduced. The limit ball 2426 drives the collar 2425 and the reciprocating block 2423 to move towards the inside of the built-in cavity 2422 (the return spring 2424 undergoes elastic deformation) until the limit ball 2426 disengages from the round hole 2412. Under the combined gravity of the lower valve rod 242 and the gate plate 25, the gate plate 25 begins to freely fall, and the built-in rod 2421 slides downward along the inside of the upper valve rod 241 until the gate plate 25 fits with the valve seat sealing ring 22.

[0054] As the counterweight plate 261 further rotates slowly, the descending groove 2612 on the counterweight plate 261 begins to slowly fit with the support block 211. When the two completely coincide, under the strong action of the strong spring 264, the counterweight plate 261 is driven to fall rapidly. The adjustment groove 2611 of the counterweight plate 261 passes over the adjustment ring 2413 (the toothed plate 262 and the rotating plate 263 also pass over the adjustment ring 2413 synchronously), and the whole gate plate 25 is rapidly pressed downward (replacing the conventional pressing by the valve rod member 24), so that the gate plate 25 and the valve seat sealing ring 22 are completely closed, realizing automatic sealing and avoiding fluid backflow or gas leakage.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatically sealable fracturing gas production wellhead valve device, characterized in that, Comprising: A transmission actuator (1); A gate valve assembly (2), the gate valve assembly (2) includes a valve body (21), the transmission actuator (1) and the valve body (21) are fixedly connected through a bracket, a valve seat sealing ring (22) is detachably installed inside the valve body (21), a valve cover (23) is detachably installed at the top of the valve body (21) through a thread group, a valve rod member (24) that is in transmission connection with the transmission actuator (1) is slidably connected inside the valve cover (23), and a gate plate (25) that is in sealing contact with the sealing surface of the valve seat sealing ring (22) is fixedly connected to the bottom end of the valve rod member (24); Wherein, the main body of the valve rod member (24) adopts a split structure, the valve rod member (24) includes an upper valve rod (241) and a lower valve rod (242), the top end of the upper valve rod (241) is in transmission connection with the transmission actuator (1), the bottom end of the lower valve rod (242) is fixedly connected to the gate plate (25), and a protective member (26) for adjusting the position of the lower valve rod (242) is arranged inside the valve body (21); the protective member (26) includes a counterweight plate (261), the circumferential outer surface of the counterweight plate (261) is in contact with the inner wall of the valve body (21), a support block (211) that is in contact with the lower surface of the counterweight plate (261) is fixedly connected to the inner wall of the valve body (21), a toothed plate (262) is fixedly connected to the upper surface of the counterweight plate (261), a rotating plate (263) is rotatably connected to the upper surface of the toothed plate (262) through a rotating groove, a sealing plate (212) that is fixedly connected to the inner wall of the valve body (21) is arranged above the toothed plate (262), and a strong spring (264) that is connected to the lower surface of the sealing plate (212) is arranged on the upper surface of the rotating plate (263); Wherein, the sealing surface of the valve seat sealing ring (22) is designed at an oblique angle with respect to the vertical center line of the valve body (21).

2. The automatically sealable fracturing gas production wellhead valve device according to claim 1, wherein: The inside of the upper valve rod (241) adopts a hollow design, the bottom end of the upper valve rod (241) is fixedly communicated with a connecting pipe (2411), and circular holes (2412) are formed on the circumferential outer surface of the connecting pipe (2411).

3. The automatic sealing fracturing gas production wellhead valve device according to claim 2, characterized in that: An inner rod (2421) that slides with the inner wall of the connecting pipe (2411) is fixedly connected to the top end of the lower valve rod (242), and the top end of the inner rod (2421) penetrates through the connecting pipe (2411) and extends into the upper valve rod (241). An inner cavity (2422) is formed inside the inner rod (2421), a reciprocating block (2423) is slidably connected to the inner wall of the inner cavity (2422), a return spring (2424) that is connected to the inner wall of the inner cavity (2422) is arranged on the outer surface of the reciprocating block (2423), a collar (2425) is fixedly connected to the side of the reciprocating block (2423) away from the return spring (2424), and a limiting ball (2426) that is engaged with the inner wall of the circular hole (2412) is rotatably installed inside the collar (2425).

4. The automatic-sealing fracturing gas production wellhead valve device according to claim 3, wherein: An adjusting ring (2413) is rotationally connected to the outer circumferential surface of the upper valve stem (241) through an annular track, and the adjusting ring (2413) is sleeved on the outer circumferential surface of the connecting pipe (2411). An arc-shaped concave block (2414) that fits the spherical surface of the limiting ball (2426) is fixedly connected to the inner wall of the adjusting ring (2413), and an adjusting convex block (2415) is fixedly connected to the outer circumferential surface of the adjusting ring (2413).

5. The automatic-sealing fracturing gas production wellhead valve device according to claim 4, characterized in that: The valve cover (23), the sealing plate (212), the rotating plate (263), the toothed plate (262), the counterweight plate (261), and the support block (211) are arranged in sequence from top to bottom. An adjusting groove (2611) that is close to the outer surface of the adjusting convex block (2415) is formed on the lower surface of the counterweight plate (261). The top end of the upper valve stem (241) sequentially penetrates through the counterweight plate (261), the toothed plate (262), the rotating plate (263), the sealing plate (212), the valve cover (23) and extends to the outside. A descending groove (2612) that fits the support block (211) is formed on the outer circumferential surface of the counterweight plate (261).

6. The automatic sealing fracturing gas production wellhead valve device according to claim 5, characterized in that: A driving box (3) is arranged on the outer surface of the valve body (21). The output end of the driving box (3) is engaged with the toothed plate (262) through a gear. The outer surface of the gate plate (25) is slidably connected to the inner wall chute of the valve body (21) through a guide block.

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