CN114992341A - Be suitable for high pressure totally enclosed well head valve - Google Patents

Abstract

The invention belongs to the technical field related to wellhead valves, and particularly relates to a high-pressure-applicable fully-sealed wellhead valve which comprises a valve body, wherein a fixed plate is fixedly connected to the inner wall of the valve body, three openings are formed in the fixed plate, and baffle plates are arranged corresponding to the openings. The valve opening and closing device has the advantages that the valve opening and closing function is achieved through the baffle, meanwhile, if the situation that the water pressure is suddenly increased is met, the impact force of the water pressure can act on the baffle to enable the baffle to swing, the impact force can be buffered under the elastic action of the torsion spring at the rotating connection position of the baffle and the mounting plate, the valve is protected, when the valve is opened and closed, the inner wall of the valve body can be cleaned through the scraper, the influence on the circulation of water flow due to excessive dirt is avoided, and the service life of the valve is shortened. Meanwhile, the scraper can clean the scraper by utilizing the impact action of liquid flowing in the cleaning process, so that the phenomenon that the cleaning effect is influenced by residual dirt caused by long-time use of the scraper is avoided.

Description

A kind of valve suitable for high pressure fully sealed wellhead

technical field

The invention belongs to the related technical field of wellhead valves, and in particular relates to a wellhead valve suitable for high pressure and full sealing.

Background technique

A valve well is a valve for underground pipelines and underground pipelines (such as water, oil, natural gas pipelines, etc.). In order to facilitate the opening and closing of part of the pipeline network operation or maintenance operations, a pit (or well) similar to a small room is set up. , Install valves and other installations in this pit, which is convenient for regular inspection, cleaning and dredging of pipelines and prevents pipelines from being blocked. This pit is called a valve well. The valve set at the wellhead is called the wellhead valve. When the existing wellhead valve is subjected to sudden changes in water pressure or air pressure, the impact force of the water flow or airflow will directly act on the valve baffle, causing impact damage to the valve. A large amount of dirt is accumulated, which affects the flow of water or airflow and reduces the service life of the valve. Therefore, the present invention proposes a high-pressure fully-sealed wellhead valve.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a fully sealed wellhead valve suitable for high pressure, so as to solve the problem that the existing wellhead valve proposed in the above background technology is prone to impact damage to the valve when the water pressure or air pressure is subject to sudden changes in water pressure or air pressure. In addition, after working for a long time, a large amount of dirt accumulates on the inner wall of the valve body, which affects the flow of water or airflow.

To achieve the above object, the present invention provides the following technical solutions:

A fully sealed wellhead valve suitable for high pressure, which includes a valve body that is rotatably provided with a driving structure, a fixing plate is fixedly connected to the inner wall of the valve body, and three openings are opened inside the fixing plate, A first pinion gear is rotatably connected to the side, a first bevel gear is fixedly connected to one side of the first pinion, a first large gear is meshed and connected to the bottom of the first pinion, and the other side of the fixed plate A first connecting plate is rotatably connected, and the first connecting plate is fixedly connected with the first large gear through a rotating shaft. The rotating shaft is rotatably sleeved inside the fixed plate. Closed baffles, one end of the three baffles close to the first connecting plate is rotatably connected with a mounting plate, a torsion spring is installed at the rotational connection between the baffle and the installation plate, and a side surface of the mounting plate is fixedly connected with a torsion spring. A fixed gear, the center of the fixed gear is fixedly sleeved with a shaft rod, both ends of the shaft rod are rotatably connected with a support plate that is fixedly connected to a first connecting plate, and the interior of the first connecting plate is provided with three A bar-shaped chute, the interior of the three bar-shaped chute is slidably connected with a rack, the side of the fixing plate is provided with three arc-shaped chute, the side of the rack is fixedly connected with a sliding piece, the The rack is slidably connected with the arc-shaped chute through the sliding piece, the rack is meshed with the fixed gear, and the drive mechanism is meshed with the first bevel gear.

Preferably, an annular fixing plate is fixedly connected to the inner wall of the valve body, a fixing ring is arranged at the geometric center of the annular fixing plate, and three second connections are fixedly connected between the outer wall of the fixing ring and the inner wall of the annular fixing plate Plate, one end of the fixing ring is rotatably connected with a mounting column, the other end of the fixing ring is fixedly connected with a second pinion, the mounting column is connected with the second pinion through a one-way rotation mechanism, and the second pinion is A second large gear is meshed and connected above, one side of the second large gear is rotatably connected to the outer wall of the second connecting plate through a shaft, the other side of the second large gear is fixedly connected with a second bevel gear, and the mounting column The outer wall is rotatably connected with three connecting rods, and torsion springs are installed at the rotating joints of the three connecting rods and the mounting column, the ends of the connecting rods are fixedly connected with a circular plate, and the outer side of the circular plate is provided with a plane block , the side wall of the circular plate is fixedly connected with a first meshing tooth, the side surface of the annular fixed plate is provided with three grooves, and the outer walls of the three grooves are fixedly connected with a second meshing tooth, and the connecting rod The outer side of the valve is provided with a cleaning mechanism for cleaning the inner wall of the valve, and the driving structure is drivingly connected with the cleaning mechanism and the baffle;

Preferably, the cleaning mechanism includes a third connecting plate fixedly connected to the outer side of the connecting rod, a scraper is provided on one side of the third connecting plate, and a slider is fixedly connected to one end of the scraper, and the scraper is The bottom end of the plate is fixedly connected with two telescopic rods, one end of the telescopic rod is fixedly connected with the third connecting plate, and the outer side of the telescopic rod is sleeved with a spring.

Preferably, the driving structure includes a fixing rod rotatably connected to the inside of the valve outer wall, a top end of the fixing rod is fixedly connected with an adjusting disc, and a bottom end of the fixing rod is fixedly connected with a third bevel gear.

Preferably, both the first bevel gear and the second bevel gear are in meshing connection with the third bevel gear.

Preferably, when the connecting rod drives the circular plate to rotate to the groove, and when the plane block is completely disengaged from the annular fixing plate, the first meshing teeth will mesh with the second meshing teeth at this time.

Preferably, the baffles and the openings are arranged in a one-to-one correspondence relationship, and the vertical cross-sectional area of the baffles is larger than the vertical cross-sectional area of the openings.

Preferably, the telescopic rod includes an inner rod fixed to the bottom of the slider and an outer rod fixed to the top of the third connecting plate, the inner rod is slidably sleeved inside the outer rod, and the two ends of the spring are respectively connected to the bottom of the slider It is fixedly connected to the top of the third connecting plate.

Compared with the prior art, the present invention provides a fully sealed wellhead valve suitable for high pressure, which has the following beneficial effects:

1. The present invention plays the role of opening and closing the valve through the baffle. At the same time, if the water pressure or air pressure suddenly increases, the impact force of the water pressure or air pressure will act on the baffle to make it swing. Under the elastic action of the torsion spring at the rotating connection of the mounting plate, it can buffer the impact force and protect the valve;

2. When opening and closing the valve in the present invention, the scraper can clean the inner wall of the valve body, so as to avoid excessive dirt which would affect the flow of water or airflow and reduce the service life of the valve. At the same time, the scraper will use the impact of liquid or gas flow to clean itself during the cleaning process, so as to avoid the residual dirt caused by the long-term use of the scraper, which will affect the cleaning effect.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but not to limit the present invention. In the accompanying drawings:

Fig. 1 is a kind of applicable high-pressure fully-sealed wellhead valve three-dimensional structure schematic diagram proposed by the present invention;

2 is a schematic diagram of the internal cross-sectional structure of the valve body proposed by the present invention;

Fig. 3 is the enlarged structural representation of A in Fig. 2;

4 is a schematic diagram of a local explosion structure proposed by the present invention;

5 is a schematic diagram of the three-dimensional structure of the front side of the fixing plate proposed by the present invention;

6 is a schematic diagram of the three-dimensional structure of the rear side of the fixing plate proposed by the present invention;

7 is a schematic diagram of a three-dimensional cross-sectional structure of a fixing plate proposed by the present invention;

8 is a schematic diagram of the distribution structure of the arc chute proposed by the present invention;

9 is a schematic diagram of the three-dimensional structure of the front side of the annular fixing plate proposed by the present invention;

10 is a schematic diagram of the three-dimensional structure of the rear side of the annular fixing plate proposed by the present invention;

11 is a schematic diagram of the three-dimensional structure of the scraper proposed by the present invention;

12 is a schematic structural diagram of the working state of the scraper proposed by the present invention;

13 is a schematic structural diagram of the scraper motion state proposed by the present invention;

FIG. 14 is a schematic structural diagram of the rear view state of the scraper proposed by the present invention;

FIG. 15 is a schematic structural diagram of the scraper according to the present invention in the front view state;

In the figure: 1, valve body; 2, fixed plate; 3, opening; 4, first bevel gear; 5, first pinion; 6, first large gear; 7, first connecting plate; 8, bar slide Slot; 9. Baffle plate; 10. Mounting plate; 11. Fixed gear; 12. Support plate; 13. Rack; 1301. Slider; 14. Arc-shaped chute; 15. Ring fixed plate; 16. Second connection plate; 17, fixing ring; 18, mounting column; 19, second pinion; 20, second large gear; 21, second bevel gear; 22, connecting rod; 23, circular plate; 24, first meshing tooth; 25, plane block; 26, groove; 27, second meshing tooth; 28, cleaning mechanism; 281, third connecting plate; 282, telescopic rod; 283, spring; 284, scraper; 285, slider; 29, Drive structure; 291, the third bevel gear; 292, the fixed rod; 293, the adjustment disc.

Detailed ways

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 only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-15 , the present invention provides a technical solution: a fully sealed wellhead valve suitable for high pressure, which includes a valve body 1 , and a fixing plate 2 is fixedly connected to the inner wall of the valve body 1 . Three openings 3 are opened inside the fixing plate 2 . A first pinion gear 5 is rotatably connected to one side of the fixed plate 2 . A first bevel gear 4 is fixedly connected to one side of the first pinion gear 5 , and a first large gear 6 is meshed and connected to the bottom of the first pinion gear 5 . The other side of the fixed plate 2 is rotatably connected with a first connecting plate 7, and the first connecting plate 7 is fixedly connected with the first large gear 6 through a rotating shaft. The rotating shaft is rotatably sleeved inside the fixed plate 2 , so that the first large gear 6 can rotate while driving the first connecting plate 7 to rotate.

The front side of the fixed plate 2 is provided with three baffles 9 for closing the opening 3 . The baffles 9 are arranged in a one-to-one correspondence with the openings 3 , and the vertical cross-sectional area of the baffles 9 is larger than the vertical cross-sectional area of the openings 3 to ensure that the baffles 9 can completely seal the openings 3 . One end of the three baffles 9 close to the first connecting plate 7 is rotatably connected with a mounting plate 10 . A torsion spring is installed at the rotational connection between the baffle 9 and the mounting plate 10 . A fixed gear 11 is fixedly connected to the side surface of the mounting plate 10 . A shaft rod is fixedly sleeved at the center of the fixed gear 11 , and both ends of the shaft rod are rotatably connected with a support plate 12 that is fixedly connected to the first connecting plate 7 . The interior of the first connecting plate 7 is provided with three bar-shaped sliding grooves 8 , and racks 13 are slidably connected to the interiors of the three bar-shaped sliding grooves 8 . The side surface of the fixing plate 2 is provided with three arc-shaped sliding grooves 14 , and the side surface of the rack 13 is fixedly connected with a sliding member 1301 . The rack 13 is connected with the arc-shaped sliding groove 14 in a limited position and sliding connection through the sliding member 1301 , and the rack 13 is meshed and connected with the fixed gear 11 . The sliding member 1301 is a T-shaped block structure, the arc-shaped sliding groove 14 is a T-shaped groove, and the sliding member 1301 and the arc-shaped sliding groove 14 realize limited sliding.

An annular fixing plate 15 is fixedly connected to the inner wall of the valve body 1 . A fixing ring 17 is provided at the geometric center of the annular fixing plate 15 . Three second connecting plates 16 are fixedly connected between the outer wall of the fixing ring 17 and the inner wall of the annular fixing plate 15 . One end of the fixing ring 17 is rotatably connected with a mounting post 18 , the other end of the fixing ring 17 is fixedly connected with a second pinion 19 , and the mounting post 18 and the second pinion 19 are connected by a one-way rotation mechanism. The one-way rotation mechanism can be selected from the known ratchet pawl mechanism. A second large gear 20 is meshed and connected above the second pinion gear 19 . One side of the second large gear 20 is rotatably connected to the outer wall of the second connecting plate 16 through a shaft, and the other side of the second large gear 20 is fixedly connected with a second bevel gear 21 . Three connecting rods 22 are rotatably connected to the outer wall of the mounting post 18 , and torsion springs are installed at the rotational connections between the three connecting rods 22 and the mounting post 18 . A circular plate 23 is fixedly connected to the end of the connecting rod 22 . The outer side of the circular plate 23 is provided with a plane block 25 , and the side wall of the circular plate 23 is fixedly connected with the first meshing teeth 24 . Three grooves 26 are defined on the side surface of the annular fixing plate 15 . The outer walls of the three grooves 26 are fixedly connected with second meshing teeth 27 , and the first meshing teeth 24 are matched with the second meshing teeth 27 . The outer side of the connecting rod 22 is provided with a cleaning mechanism 28 for cleaning the inner wall of the valve body 1 . The valve body 1 is provided with a drive structure 29 for operating the cleaning mechanism 28 and the baffle 9 .

The cleaning mechanism 28 includes a third connecting plate 281 fixedly connected with the outer side of the connecting rod 22 . A scraper 284 is provided on one side of the third connecting plate 281 . A slider 285 is fixedly connected to one end of the scraper 284 . Two telescopic rods 282 are fixedly connected to the bottom end of the scraper 284 . One end of the telescopic rod 282 is fixedly connected with the third connecting plate 281 . A spring 283 is sleeved on the outer side of the telescopic rod 282 . The telescopic rod 282 includes an inner rod fixed to the bottom of the slider 285 and an outer rod fixed to the top of the third connecting plate 281 , and the inner rod is slidably sleeved inside the outer rod. Both ends of the spring 283 are fixedly connected to the bottom of the slider 285 and the top of the third connecting plate 281 respectively. The setting of the sliding block 285 reduces the friction between one end of the scraper 284 and the inner wall of the valve body 1 , so that the scraper 284 operates more smoothly.

The second bevel gear 21 drives the second pinion gear 19 to rotate through the second large gear 20 . The second pinion gear 19 drives the mounting column 18 to rotate, and the mounting column 18 drives the three connecting rods 22 to rotate. The connecting rod 22 drives the scraper 284 to rotate through the third connecting plate 281 and the telescopic rod 282 (the rotation is counterclockwise in FIG. 9 and clockwise in FIG. 10 ). During the rotation of the scraper 284, the dirt on the inner wall of the valve body 1 can be cleaned.

The drive structure 29 includes a fixed rod 292 rotatably connected to the inside of the outer wall of the valve body 1 . The top end of the fixing rod 292 is fixedly connected with the adjusting plate 293 , and the bottom end of the fixing rod 292 is fixedly connected with the third bevel gear 291 . Both the first bevel gear 4 and the second bevel gear 21 are meshed with the third bevel gear 291 . When the adjusting plate 293 is rotated, the adjusting plate 293 drives the fixed rod 292 to rotate, and the fixed rod 292 drives the third bevel gear 291 to rotate. Since both the first bevel gear 4 and the second bevel gear 21 are meshed with the third bevel gear 291 , the third bevel gear 291 can drive the first bevel gear 4 and the second bevel gear 21 to rotate when the third bevel gear 291 rotates.

It should be noted that when the connecting rod 22 drives the circular plate 23 to rotate to the groove 26, and when the plane block 25 is completely disengaged from the annular fixing plate 15, the first meshing teeth 24 will mesh with the second meshing teeth 27 at this time. .

The working principle and use flow of the present invention: Fig. 2 shows the state of the valve being closed. To switch to the open state, the adjusting plate 293 needs to be rotated. The adjusting plate 293 drives the third bevel gear 291 to rotate through the fixed rod 292 , and the third bevel gear 291 drives the first bevel gear 4 and the second bevel gear 21 to rotate. The first bevel gear 4 drives the first large gear 6 to rotate through the first pinion gear 5 . The first large gear 6 drives the first connecting plate 7 to rotate clockwise (clockwise in FIG. 5 ). When the first connecting plate 7 rotates, the baffle plate 9 and the rack 13 are driven to rotate. When the rack 13 rotates clockwise, through the limiting and guiding action of the bar-shaped chute 8 and the arc-shaped chute 14, the rack 13 moves to the outside in the bar-shaped chute 8 while rotating clockwise, and the rack 13 During the process of moving to the outside, the mounting plate 10 and the baffle 9 will be turned over by a certain angle through the fixed gear 11 , and the final state of the baffle 9 is shown in FIG. 12 . At this time, the opening 3 is no longer blocked by the baffle 9, the valve is opened, and the water or air flow will pass through the opening 3. At the same time, if the water pressure or air pressure suddenly increases, the impact force of the water pressure or air pressure will act on the The baffle 9 swings on it, and under the elastic action of the torsion spring at the rotating connection between the baffle 9 and the mounting plate 10, the impact force can be buffered and the valve can be protected.

The second bevel gear 21 drives the second pinion gear 19 to rotate through the second large gear 20 . The second pinion gear 19 drives the mounting column 18 to rotate, and the mounting column 18 drives the three connecting rods 22 to rotate. The connecting rod 22 drives the scraper 284 to rotate through the third connecting plate 281 and the telescopic rod 282 (the rotation is counterclockwise in FIG. 9 and clockwise in FIG. 10 ). During the rotation of the scraper 284, the dirt on the inner wall of the valve body 1 can be cleaned.

The connecting rod 22 drives the circular plate 23 to rotate, and the circular plate 23 slides on the annular fixed plate 15 through the plane block 25 . Under the restriction of the plane block 25 , unnecessary rotation of the connecting rod 22 during the revolving can be avoided, thereby affecting the cleaning process of the scraper 284 . When the connecting rod 22 drives the circular plate 23 to rotate to the groove 26, and when the plane block 25 is completely disengaged from the annular fixing plate 15, the first meshing teeth 24 will mesh with the second meshing teeth 27, so that the circular plate 23 Perform a counterclockwise rotation by a certain angle (counterclockwise in Figure 11). During the counterclockwise rotation of the circular plate 23 , the circular plate 23 drives the connecting rod 22 to rotate counterclockwise, and the connecting rod 22 drives the scraper 284 to rotate through the third connecting plate 281 and the telescopic rod 282 . When the scraper 284 rotates, the slider 285 will move the scraper 284 inward through the telescopic rod 282 under the blocking action of the inner wall of the valve body 1, and then the spring 283 will be compressed. At this time, the state of the scraper 284 is shown in the figure 12, Figure 13, Figure 14, Figure 15. In this state, the dust scraping surface of the scraper 284 is just inclined toward the opening 3, as shown in FIG. 15 . At this time, under the impact of the liquid, the dust scraping surface of the scraper 284 can be cleaned, so as to avoid residual dirt on the scraper 284 and affect the cleaning effect.

Afterwards, when the three connecting rods 22 continue to revolve, the first meshing teeth 24 on the circular plate 23 will disengage from the second meshing teeth 27, but due to the length design of the groove 26, the circular plate 23 will continue to be in the groove 26. At this time, since the first meshing teeth 24 are no longer meshed with the second meshing teeth 27, the connecting rod 22 will be restored to the initial state under the action of the torsion spring at the connecting rod 22 and the mounting post 18, and at the same time the spring 283 Under the action of elasticity, the scraper 284 will return to its original state. Then, the connecting rod 22 continues to revolve, so that the flat block 25 on the circular plate 23 is in sliding contact with the annular fixing plate 15 again. At this time, the scraper 284 will continue to clean the inner wall of the valve body 1 .

It should be noted that the outer diameters of the third bevel gear 291 , the first bevel gear 4 , the first pinion 5 , the first large gear 6 , the second bevel gear 21 , the second large gear 20 , and the second pinion 19 The setting of different sizes is to adjust the transmission ratio of the scraper 284 and the baffle 9, so that when the third bevel gear 291 rotates a certain degree, the baffle 9 will only rotate 60 degrees when the scraper 284 rotates for many times. .

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. The utility model provides a be suitable for high pressure full seal well head valve, its is provided with valve body (1) of drive structure (29) including rotating, fixedly connected with fixed plate (2) on the inner wall of valve body (1) fixed plate (2) inside three opening (3), its characterized in that have been seted up: one side of the fixing plate (2) is rotatably connected with a first small gear (5), one side of the first small gear (5) is fixedly connected with a first bevel gear (4), the lower part of the first small gear (5) is meshed with a first large gear (6), the other side of the fixing plate (2) is rotatably connected with a first connecting plate (7), the first connecting plate (7) is fixedly connected with the first large gear (6) through a rotating shaft, the rotating shaft is rotatably sleeved inside the fixing plate (2), three baffles (9) used for closing the opening (3) are arranged on the front side of the fixing plate (2), one ends of the three baffles (9) close to the first connecting plate (7) are rotatably connected with mounting plates (10), torsional springs are installed at the rotating connection parts of the baffles (9) and the mounting plates (10), and the side faces of the mounting plates (10) are fixedly connected with fixed gears (11), the fixed cover of center department of fixed gear (11) is equipped with the axostylus axostyle, the both ends of axostylus axostyle all rotate be connected with first connecting plate (7) fixed connection's backup pad (12), three bar spout (8) have been seted up to the inside of first connecting plate (7), three equal sliding connection in inside of bar spout (8) has rack (13), three arc spout (14) have been seted up to the side of fixed plate (2), the side fixed connection of rack (13) has slider (1301), rack (13) are through slider (1301) and arc spout (14) sliding connection, rack (13) are connected with fixed gear (11) meshing, actuating mechanism (29) are connected with first bevel gear (4) meshing.

2. The high-pressure full-sealing wellhead valve suitable for the oil well is characterized in that,

the valve is characterized in that an annular fixing plate (15) is fixedly connected to the inner wall of the valve body (1), a fixing ring (17) is arranged at the geometric center of the annular fixing plate (15), three second connecting plates (16) are fixedly connected between the outer wall of the fixing ring (17) and the inner wall of the annular fixing plate (15), one end of the fixing ring (17) is rotatably connected with a mounting column (18), the other end of the fixing ring (17) is fixedly connected with a second small gear (19), the mounting column (18) is connected with the second small gear (19) through a one-way rotating mechanism, a second large gear (20) is meshed and connected with the upper portion of the second small gear (19), one side of the second large gear (20) is rotatably connected to the outer wall of the second connecting plate (16) through a shaft rod, a second large gear (21) is fixedly connected to the other side of the second large gear (20), and three connecting rods (22) are rotatably connected to the outer wall of the mounting column (18), it is three the torsional spring is all installed with the rotation junction of erection column (18) in connecting rod (22), tip fixedly connected with plectane (23) of connecting rod (22), the outside of plectane (23) is equipped with plane piece (25), the first meshing tooth of lateral wall fixedly connected with (24) of plectane (23), three recess (26) have been seted up to the side of annular fixed plate (15), and is three equal fixedly connected with second meshing tooth (27) on recess (26) outer wall, the outside of connecting rod (22) is provided with carries out clear clean mechanism (28) to valve body (1) inner wall, and drive structure (29) are connected with clean mechanism (28), baffle (9) drive.

3. The applicable high-pressure fully-sealed wellhead valve according to claim 2,

clean mechanism (28) including with the outside fixed connection's of connecting rod (22) third connecting plate (281), one side of third connecting plate (281) is equipped with scraper blade (284), the one end fixedly connected with slider (285) of scraper blade (284), the bottom fixedly connected with two telescopic links (282) of scraper blade (284), the one end and the third connecting plate (281) fixed connection of telescopic link (282), the outside cover of telescopic link (282) is equipped with spring (283).

4. The high-pressure full-sealing wellhead valve according to claim 1 or 2, characterized in that: the driving structure (29) comprises a fixing rod (292) rotatably connected to the inner portion of the outer wall of the valve body (1), the top end of the fixing rod (292) is fixedly connected with an adjusting disc (293), and the bottom end of the fixing rod (292) is fixedly connected with a third bevel gear (291).

5. The valve of claim 4, wherein the valve is adapted to be used in a high pressure and fully sealed wellhead: the first bevel gear (4) and the second bevel gear (21) are in meshed connection with a third bevel gear (291).

6. The valve of claim 2, wherein the valve is adapted to be used in a high pressure and fully sealed wellhead, and is characterized in that: when the connecting rod (22) drives the circular plate (23) to rotate to the groove (26) and the plane block (25) is completely separated from the annular fixing plate (15), the first meshing teeth (24) are meshed with the second meshing teeth (27).

7. The valve of claim 1, wherein the valve is adapted to be used in a high pressure and fully sealed wellhead: the baffle plates (9) are arranged in one-to-one correspondence with the openings (3), and the vertical cross-sectional areas of the baffle plates (9) are larger than those of the openings (3).

8. The valve of claim 2, wherein the valve is adapted to be used in a high pressure and fully sealed wellhead: the telescopic rod (282) comprises an inner rod fixed to the bottom of the sliding block (285) and an outer rod fixed to the top of the third connecting plate (281), the inner rod is sleeved inside the outer rod in a sliding mode, and two ends of the spring (283) are fixedly connected with the bottom of the sliding block (285) and the top of the third connecting plate (281) respectively.

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