Fracturing gas production wellhead valve device capable of being automatically sealed

Abstract

The fracturing gas production wellhead valve device comprises a transmission actuator and a gate valve assembly, the gate valve assembly comprises a valve body, the transmission actuator and the valve body are fixedly connected through a support, a valve seat sealing ring is detachably installed in the valve body, and the valve seat sealing ring is fixedly connected with the transmission actuator. A valve deck is detachably mounted at the top end of the valve body through a thread set, and a valve rod piece in transmission connection with the transmission actuator is slidably connected into the valve deck. The fracturing gas production wellhead valve device capable of being automatically sealed can effectively solve the problems that in the prior art, a wellhead gate valve is mainly used for controlling opening and closing of fluid in a pipeline and guaranteeing safety and stability of the production process, but the wellhead gate valve is prone to rusting after being affected with damp, and a valve rod fails after a long time; when a transmission actuator is damaged, a valve rod cannot move downwards, a gate plate cannot be closed, and fluid backflow or gas leakage is caused.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to an automatically sealed fracturing gas production wellhead valve device. Background Art

[0002] Wellhead gate valve is a common type of valve, widely used in petroleum, natural gas, chemical, metallurgy and other industries. 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 up and down. When the gate is in the closed state, the fluid cannot pass through the valve, and the fluid in the pipeline is in a stopped state. When the gate is in the open state, the fluid can pass through the valve smoothly, and the fluid in the pipeline is in a flowing state. The opening and closing of the wellhead gate valve is usually achieved by a transmission actuator.

[0003] Wellhead gate valve is a valve that controls the flow of fluid in a pipeline by moving the gate up and down. It is usually installed at the wellhead of the pipeline, hence the name wellhead gate valve. The main function of existing wellhead gate valves is to control the opening and closing of fluid in the pipeline to ensure the safety and stability of the production process. However, wellhead gate valves are most likely to rust after being exposed to moisture, and the valve stem may fail over time. Secondly, when the transmission actuator is damaged, the valve stem will not be able to move downward, and the gate will not be able to close, resulting in fluid backflow or gas leakage. Summary of the invention

[0004] Technical issues solved In view of the above-mentioned shortcomings of the prior art, the present invention provides an automatically sealing fracturing gas wellhead valve device, which 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 stem may fail over time. Secondly, when the transmission actuator is damaged, the valve stem will not be able to move downward, and the gate plate will not be able to close, resulting in fluid backflow or gas leakage.

[0005] Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides an automatically sealed fracturing gas production wellhead valve device, comprising: Transmission actuator; A gate valve assembly, the gate valve assembly comprising a valve body, the transmission actuator and the valve body are fixedly connected via a bracket, a valve seat sealing ring is detachably mounted inside the valve body, a valve cover is detachably mounted on the top of the valve body via a threaded group, a valve stem member drivingly connected to the transmission actuator is slidably connected inside the valve cover, and a gate plate that fits the sealing surface of the valve seat sealing ring is fixedly connected to the bottom end of the valve stem member; The main body of the valve stem member adopts a detachable structure, and the valve stem member includes an upper valve stem and a lower valve stem. The top end of the upper valve stem is transmission-connected to the transmission actuator, and the bottom end of the lower valve stem is fixedly connected to the gate plate. A protective member capable of adjusting the position of the lower valve stem is provided inside the valve body. Wherein, the sealing surface of the valve seat sealing ring is designed to be at an oblique angle to the vertical center line of the valve body.

[0006] Furthermore, the interior of the upper valve stem adopts a hollow design, the bottom end of the upper valve stem is fixedly connected to a coupling tube, and a circular hole is opened on the circumferential outer surface of the coupling tube.

[0007] Furthermore, the top end of the lower valve stem is fixedly connected to a built-in rod that slides with the inner wall of the coupling tube, and the top end of the built-in rod passes through the coupling tube and extends to the interior of the upper valve stem, a built-in cavity is provided inside the built-in rod, and a reciprocating block is slidably connected to the inner wall of the built-in cavity, and a return spring connected to the inner wall of the built-in cavity is provided on the outer surface of the reciprocating block, the reciprocating block is fixedly connected to a ring on the side away from the return spring, and a limiting ball that engages with the inner wall of the circular hole is rotatably installed on the inner side of the ring.

[0008] Furthermore, the circumferential outer surface of the upper valve stem is rotatably connected to an adjustment ring via a circular track, and the adjustment ring is sleeved on the circumferential outer surface of the coupling tube, the inner wall of the adjustment ring is fixedly connected to an arc-shaped recessed block that fits the spherical surface of the limiting ball, and the circumferential outer surface of the adjustment ring is fixedly connected to an adjustment protrusion.

[0009] Furthermore, the protective part includes a counterweight plate, the circumferential outer surface of the counterweight plate is fitted with the inner wall of the valve body, the inner wall of the valve body is fixedly connected with a support block fitted with the lower surface of the counterweight plate, the upper surface of the counterweight plate is fixedly connected with a tooth plate, the upper surface of the tooth plate is rotatably connected to a rotating plate through a rotating groove, a sealing plate fixedly connected to the inner wall of the valve body is provided above the tooth plate, and a strong spring connected to the lower surface of the sealing plate is provided on the upper surface of the rotating plate.

[0010] 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.

[0011] 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.

[0012] Beneficial Effects Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: 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

[0013] 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.

[0014] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention; 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; Figure 3 It is a schematic diagram of the structure of the three-dimensional separation of the counterweight plate and the rotating plate in an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a three-dimensional partial cross-section of a valve body according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the three-dimensional combination of the adjusting ring and the adjusting groove according to an embodiment of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of a valve stem and a gate plate according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the structure of the adjustment ring and the upper valve stem being three-dimensionally separated according to an embodiment of the present invention; Figure 8 It is a schematic structural diagram of the upper valve stem and the lower valve stem being three-dimensionally separated in an embodiment of the present invention.

[0015] The numbers in the figure 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 stem; 241. Upper valve stem; 2411. Combination tube; 2412. Round hole; 2413. Adjusting ring; 2414. Arc concave block; 2415. Adjusting convex block; 242. Lower valve stem; 2421. Built-in rod; 2422. Built-in cavity; 2423. Reciprocating block; 2424. Return spring; 2425. Ring; 2426. Limiting ball; 25. Gate; 26. Protective part; 261. Counterweight plate; 2611. Adjusting groove; 2612. Descending groove; 262. Tooth plate; 263. Rotating plate; 264. Power spring; 3. Drive box. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention will be further described below in conjunction with the embodiments.

[0018] Example: See also Figure 1-Figure 8 The present invention provides a technical solution: an automatically sealed fracturing gas production wellhead valve device, comprising: Transmission actuator 1; The gate valve assembly 2 includes a valve body 21, the transmission actuator 1 and the valve body 21 are fixedly connected by a bracket, a valve seat sealing ring 22 is detachably installed inside the valve body 21, a valve cover 23 is detachably installed on the top of the valve body 21 through a threaded group, a valve stem 24 that is transmission-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 sealing ring 22 is fixedly connected to the bottom end of the valve stem 24; The main body of the valve stem 24 adopts a detachable structure. The valve stem 24 includes an upper valve stem 241 and a lower valve stem 242. The top end of the upper valve stem 241 is transmission-connected to the transmission actuator 1, and the bottom end of the lower valve stem 242 is fixedly connected to the gate 25. A protective member 26 for adjusting the position of the lower valve stem 242 is provided inside the valve body 21. The sealing surface of the valve seat sealing ring 22 is designed to be at an oblique angle to the vertical center line of the valve body 21 to prevent the gate plate 25 from being stuck when the temperature changes.

[0019] The interior of the upper valve stem 241 is hollow in design. The bottom end of the upper valve stem 241 is fixedly connected to a coupling tube 2411 , and a circular hole 2412 is formed on the circumferential outer surface of the coupling tube 2411 .

[0020] The top end of the lower valve stem 242 is fixedly connected to a built-in rod 2421 that slides with the inner wall of the connecting tube 2411, and the top end of the built-in rod 2421 penetrates the connecting tube 2411 and extends to the interior of the upper valve stem 241. A built-in cavity 2422 is provided inside the built-in rod 2421, and a reciprocating block 2423 is slidably connected to the inner wall of the built-in cavity 2422. A return spring 2424 connected to the inner wall of the built-in cavity 2422 is provided on the outer surface of the reciprocating block 2423. The reciprocating block 2423 is fixedly connected to a ring 2425 on one side 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 ring 2425.

[0021] The outer circumferential surface of the upper valve stem 241 is rotatably connected to an adjusting ring 2413 via a circular track, and the adjusting ring 2413 is sleeved on the outer circumferential surface of the coupling tube 2411. The inner wall of the adjusting ring 2413 is fixedly connected to an arc-shaped recessed block 2414 that fits the spherical surface of the limiting ball 2426, and the outer circumferential surface of the adjusting ring 2413 is fixedly connected to an adjusting protrusion 2415.

[0022] The protective member 26 includes a counterweight plate 261, the circumferential outer surface of the counterweight plate 261 is fitted with the inner wall of the valve body 21, the inner wall of the valve body 21 is fixedly connected with a support block 211 which is fitted with the lower surface of the counterweight plate 261, the upper surface of the counterweight plate 261 is fixedly connected with a tooth plate 262, the upper surface of the tooth plate 262 is rotatably connected with a rotating plate 263 through a rotating groove, a sealing plate 212 fixedly connected to the inner wall of the valve body 21 is provided above the tooth plate 262, and a strong spring 264 connected to the lower surface of the sealing plate 212 is provided on the upper surface of the rotating plate 263.

[0023] The valve cover 23, sealing plate 212, rotating plate 263, tooth plate 262, counterweight plate 261 and support block 211 are arranged in sequence from top to bottom. The lower surface of the counterweight plate 261 is provided with an adjustment groove 2611 close to the outer surface of the adjustment protrusion 2415. The top end of the upper valve stem 241 passes through the counterweight plate 261, tooth plate 262, rotating plate 263, sealing plate 212, valve cover 23 in sequence and extends to the outside. The outer surface of the circumference of the counterweight plate 261 is provided with a descending groove 2612 that fits with the support block 211.

[0024] A driving box 3 is disposed on the outer surface of the valve body 21 , and an output end of the driving box 3 is meshedly connected with a toothed plate 262 through a gear, and an outer surface of the gate plate 25 is slidably connected with an inner wall groove of the valve body 21 through a guide block.

[0025] refer to Figure 1-8Wellhead gate valve is a valve that controls the flow of fluid in a pipeline by moving the gate up and down. It is usually installed at the wellhead of the pipeline, hence the name wellhead gate valve. The main function of existing wellhead gate valves is to control the opening and closing of fluid in the pipeline to ensure the safety and stability of the production process. However, wellhead gate valves are most likely to rust after being exposed to moisture. Over time, the valve stem may fail (the open stem is prone to oxidation and corrosion). Secondly, when the transmission actuator is damaged, the valve stem will not be able to move downward, and the gate will not be able to close, resulting in fluid backflow or gas leakage. In order to overcome the above-mentioned defects, the present invention designs an automatically sealed fracturing gas production wellhead valve device.

[0026] When the transmission actuator 1 and the valve stem 24 are normal: Initially, the valve stem 24 is a complete whole. The built-in rod 2421 on the lower valve stem 242 extends into the upper valve stem 241. The bottom end of the connecting tube 2411 fits with the end face of the lower valve stem 242. At the same time, the limiting ball 2426 is acted upon by the elastic force of the return spring 2424. The limiting ball 2426 is engaged in the circular hole 2412, so that the upper valve stem 241, the connecting tube 2411, the built-in rod 2421, the lower valve stem 242 and the limiting ball 2426 are combined into a whole. In order to further improve the bonding strength between the upper valve stem 241 and the lower valve stem 242, the limiting ball 2426 of the present application adopts a circular groove on its spherical surface to rotate and install the collar 2425. Firstly, it can ensure that the limiting ball 2426 is normally inserted into the circular hole 2412 under the elastic force of the reset spring 2424. Secondly, the limiting ball 2426 can only "rotate horizontally" in the space surrounded by the collar 2425, and cannot "rotate vertically", which can prevent the limiting ball 2426 from rotating vertically out of the circular hole 2412 under the gravity of the lower valve stem 242 (including the gate plate 25). The combined bearing force of the limiting ball 2426 and the circular hole 2412 only needs to be able to overcome the lifting force of the gate plate 25. In the normal up and down movement of the valve stem 24 as a whole, the valve stem 24 and the protective member 26 do not interfere with each other, and the protective member 26 does not participate in the normal operation of the valve stem 24.

[0027] Valve opening: By starting the transmission actuator 1, the output end of the transmission actuator 1 drives the valve stem 24 to move upward along the inside of the valve cover 23, and drives the gate 25 to move upward along the sealing surface of the valve seat sealing ring 22, so that the fluid can smoothly pass 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 25 moves upward and completely disengages from the flow channel of the valve body 21. At this time, the adjusting ring 2413 and the adjusting protrusion 2415 move together to the space surrounded by the adjusting groove 2611 (the adjusting groove 2611 is in the vertical direction, and the groove is a through hole type), and the outer surface of the gate 25 is slidably connected to the inner wall groove of the valve body 21 through the guide block to prevent the gate 25 from rotating and deviating.

[0028] Valve closing: By starting the transmission actuator 1, the output end of the transmission actuator 1 drives the valve stem 24 to move downward along the inside of the valve cover 23, driving the outer surface of the gate 25 to slide downward through the guide block and the inner wall groove of the valve body 21, and the outer surface of the gate 25 moves downward along the sealing surface of the valve seat sealing ring 22 until the two are completely sealed and fit to prevent the fluid from passing.

[0029] When the transmission actuator 1 or the valve stem 24 is damaged: As can be seen from the above, the opening and closing of the valve depends entirely on the positional relationship between the gate plate 25 and the valve seat sealing ring 22. When the two are completely closed, the fluid is prevented from passing through. When the two are completely separated, the flow channel of the valve body 21 is opened, and the fluid can flow smoothly. When the transmission actuator 1 or the valve stem 24 is damaged, it is impossible to close the gate plate 25 and the valve seat sealing ring 22 again, and there is a risk of fluid backflow or gas leakage. In contrast, in this application, it is only necessary to start the drive box 3 (the box adopts a sealed structure, which is basically not used at ordinary times and is only used in emergencies), and the servo motor inside it rotates slowly through the gear meshing transmission tooth plate 262, driving the counterweight plate 261 to rotate slowly along the upper surface of the support block 211 (the counterweight plate 261 is usually under the elastic force of the strong spring 264, and the counterweight plate 261 always remains in a stationary state), and at the same time, the tooth plate 262 rotates slowly around the rotating plate 263. During the slow rotation of the counterweight plate 261 , the adjusting groove 2611 drives the adjusting protrusion 2415 to rotate slowly synchronously, drives the adjusting ring 2413 to rotate slowly around the annular track of the upper valve stem 241 , and drives the arc-shaped concave block 2414 to rotate slowly synchronously. During the rotation of the arc-shaped recessed block 2414, the arc surface of the arc-shaped recessed block 2414 begins to squeeze the limiting ball 2426. Since the limiting ball 2426 can only perform "horizontal rotation", the friction between the arc-shaped recessed block 2414 and the limiting ball 2426 is greatly reduced. The limiting ball 2426 drives the sleeve ring 2425 and the reciprocating block 2423 to move into the built-in cavity 2422 (the return spring 2424 undergoes elastic deformation) until the limiting ball 2426 is separated from the circular hole 2412. Under the joint gravity of the lower valve stem 242 and the gate plate 25, the gate plate 25 begins to fall freely, and the built-in rod 2421 slides downward along the inside of the upper valve stem 241 until the gate plate 25 fits with the valve seat sealing ring 22.

[0030] As the counterweight plate 261 rotates further slowly, the descending groove 2612 on the counterweight plate 261 begins to slowly fit the support block 211. When the two are completely overlapped, under the strong action of the strong spring 264, the counterweight plate 261 is driven to fall rapidly, and the adjustment groove 2611 of the counterweight plate 261 passes over the adjustment ring 2413 (the tooth plate 262 and the rotating plate 263 also pass over the adjustment ring 2413 synchronously), and the gate plate 25 is quickly pressed downward as a whole (replacing the conventional valve stem 24 to press), 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.

[0031] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, 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 sealed fracturing gas production wellhead valve device, characterized in that: include: Transmission actuator (1); A gate valve assembly (2), the gate valve assembly (2) comprising a valve body (21), the transmission actuator (1) and the valve body (21) being fixedly connected via a bracket, a valve seat sealing ring (22) being detachably mounted inside the valve body (21), a valve cover (23) being detachably mounted on the top of the valve body (21) via a threaded assembly, a valve stem (24) being slidably connected inside the valve cover (23) and being transmission-connected to the transmission actuator (1), and a gate plate (25) being fixedly connected to the bottom end of the valve stem (24) and being in contact with the sealing surface of the valve seat sealing ring (22); The main body of the valve stem member (24) adopts a detachable structure, and the valve stem member (24) comprises an upper valve stem (241) and a lower valve stem (242), the top end of the upper valve stem (241) is drivingly connected to the driving actuator (1), and the bottom end of the lower valve stem (242) is fixedly connected to the gate plate (25), and a protective member (26) capable of adjusting the position of the lower valve stem (242) is arranged inside the valve body (21); The sealing surface of the valve seat sealing ring (22) is designed to be at an oblique angle to the vertical center line of the valve body (21).

2. The automatic sealing fracturing gas production wellhead valve device according to claim 1, characterized in that: The interior of the upper valve stem (241) is of hollow design; the bottom end of the upper valve stem (241) is fixedly connected to a coupling tube (2411); and a circular hole (2412) is provided on the circumferential outer surface of the coupling tube (2411).

3. The automatic sealing fracturing gas production wellhead valve device according to claim 2, characterized in that: The top end of the lower valve stem (242) is fixedly connected to a built-in rod (2421) that slides with the inner wall of the connecting tube (2411), and the top end of the built-in rod (2421) passes through the connecting tube (2411) and extends to the interior of the upper valve stem (241); a built-in cavity (2422) is provided inside the built-in rod (2421); a reciprocating block (2423) is slidably connected to the inner wall of the built-in cavity (2422); a return spring (2424) that is connected to the inner wall of the built-in cavity (2422) is provided on the outer surface of the reciprocating block (2423); the reciprocating block (2423) is fixedly connected to a collar (2425) on the side 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).

4. The automatic sealing fracturing gas production wellhead valve device according to claim 3, characterized in that: The circumferential outer surface of the upper valve stem (241) is rotatably connected to an adjustment ring (2413) via a circular track, and the adjustment ring (2413) is sleeved on the circumferential outer surface of the coupling tube (2411), and the inner wall of the adjustment ring (2413) is fixedly connected to an arc-shaped concave block (2414) that fits the spherical surface of the limiting ball (2426), and the circumferential outer surface of the adjustment ring (2413) is fixedly connected to an adjustment protrusion (2415).

5. The automatic sealing fracturing gas production wellhead valve device according to claim 4, characterized in that: The protective member (26) comprises a counterweight plate (261), the circumferential outer surface of the counterweight plate (261) being in contact with the inner wall of the valve body (21), the inner wall of the valve body (21) being fixedly connected to a support block (211) in contact with the lower surface of the counterweight plate (261), the upper surface of the counterweight plate (261) being fixedly connected to a tooth plate (262), the upper surface of the tooth plate (262) being rotatably connected to a rotating plate (263) via a rotating groove, a sealing plate (212) being fixedly connected to the inner wall of the valve body (21) being provided above the tooth plate (262), and a strong spring (264) being connected to the lower surface of the sealing plate (212) being provided on the upper surface of the rotating plate (263).

6. The automatic sealing fracturing gas production wellhead valve device according to claim 5, characterized in that: The valve cover (23), the sealing plate (212), the rotating plate (263), the tooth plate (262), the counterweight plate (261) and the support block (211) are arranged in sequence from top to bottom; the lower surface of the counterweight plate (261) is provided with an adjustment groove (2611) close to the outer surface of the adjustment protrusion (2415); the top end of the upper valve stem (241) passes through the counterweight plate (261), the tooth plate (262), the rotating plate (263), the sealing plate (212) and the valve cover (23) in sequence and extends to the outside; the outer surface of the circumference of the counterweight plate (261) is provided with a descending groove (2612) in contact with the support block (211).

7. The automatic sealing fracturing gas production wellhead valve device according to claim 5, characterized in that: The outer surface of the valve body (21) is provided with a drive box (3), the output end of the drive box (3) is meshedly connected with a toothed plate (262) via a gear, and the outer surface of the gate plate (25) is slidably connected with an inner wall groove of the valve body (21) via a guide block.

Images