Oil exploitation oil pipe stop valve

Abstract

The invention relates to the field of valves, in particular to an oil exploitation oil pipe stop valve which comprises a valve body, the valve body comprises an oil inlet end and an oil outlet end, a valve element sleeve is arranged between the oil inlet end and the oil outlet end, an oil outlet of the oil inlet end is communicated with the upper half portion of the valve element sleeve, and an oil inlet of the oil outlet end is communicated with the lower half portion of the valve element sleeve. A sliding layer is radially arranged in the middle of the valve core sleeve, a valve seat is arranged in the sliding layer, a valve core is arranged above the valve seat, the top of the valve core is fixedly connected with a valve rod, and the outer ring of the upper end of the valve rod is in threaded connection with a valve cover arranged at the upper end of the valve core sleeve; according to the designed stop valve, after the valve seat is damaged, the whole valve body does not need to be replaced, only the valve seat needs to be replaced, the use cost of the stop valve can be saved, meanwhile, the whole valve seat replacement process is easy to operate, the replacement efficiency is high, compared with replacement of the whole stop valve, the occupied time is short, the influence is small, the matching mode of the valve seat and the valve body is simple, and the cost is low. And long-time stable operation of the valve body can be ensured.

Description

Technical Field

[0001] The invention relates to the field of valves, in particular to a stop valve for an oil pipeline in petroleum production. Background Art

[0002] The stop valve is a commonly used valve in the petroleum pipeline system. The valve seat of the stop valve is a key component, and its sealing performance directly affects the safety and reliability of the petroleum pipeline system.

[0003] During the use of the stop valve, because petroleum often contains corrosive components such as hydrogen sulfide and carbon dioxide, these components will cause corrosion on the valve seat surface, resulting in damage to the valve seat sealing surface. In addition, when the petroleum fluid flows in the pipeline, it will have a scouring effect on the valve seat. Especially when the medium contains solid particles, these particles will abrade the valve seat sealing surface, resulting in damage to the sealing surface. For example, in a pipeline conveying sand-containing oil products, sand particles will cause serious wear on the valve seat. Moreover, some stop valves in the oil pipeline system are frequently operated. During operation, the valve is closed too quickly or with too much force, and a violent collision may occur between the valve core and the valve seat, resulting in damage to the valve seat sealing surface.

[0004] The existing stop valve is made of a valve seat and a valve body that are cast in one piece. When the valve seat inside the valve body is damaged, the sealing of the entire stop valve is destroyed, and the stop valve can only be replaced with a new one, which leads to a high cost of using the stop valve.

[0005] Therefore, in response to the above problems, a petroleum production oil pipeline stop valve is proposed. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the oil production oil pipeline stop valve described in the present invention includes a valve body, the valve body includes an oil inlet end and an oil outlet end, a valve core sleeve is provided between the oil inlet end and the oil outlet end, the oil outlet of the oil inlet end is connected with the upper half of the valve core sleeve, the oil inlet of the oil outlet end is connected with the lower half of the valve core sleeve, and a sliding layer is radially provided in the middle part of the valve core sleeve, a valve seat is provided in the sliding layer, an extension body sealedly connected to the valve seat is provided outside the valve seat, and the extension body can push the valve seat into the sliding layer along the jacking hole provided on the outer ring of the valve body, a valve core is provided above the valve seat, a valve stem is fixed to the top of the valve core, and the outer ring of the upper end of the valve stem is threadedly connected to the valve cover provided on the upper end of the valve core sleeve.

[0008] Preferably, the valve body further comprises a shell, which respectively wraps the pipe body at the oil inlet end and the oil outlet end, as well as the valve core sleeve, and the valve seat is fixed to the shell; The extension body includes a limit plate arranged outside the shell, the inner side wall of the limit plate is fixedly connected to a support plate, and the end of the support plate is provided with a mounting seat adapted to the outer ring of the valve seat; The outer ring of the shell is also provided with a clamp, which is used to fasten the limiting plate to the shell.

[0009] Preferably, two ring bodies are symmetrically provided on the outer ring of the shell, each ring body has a radial recess, and a notch is provided at the position opposite to the socket, the support plate is inserted into the socket, the two ends of the limit plate are embedded in the notch, the clamp is clamped in the recess, and the limit plate is fastened to the shell.

[0010] Preferably, bosses are symmetrically provided on the outer ring of each clamp, and each boss is threadedly connected with a top screw, which passes through the clamp and presses against the limit plate.

[0011] Preferably, annular grooves are provided on the upper and lower surfaces of the end of the support plate, and hollow sealing rings are provided in both annular grooves; An oil circuit is provided inside the supporting plate, the oil circuit passes through the annular groove and is connected to the sealing ring, and a pressure regulating bolt is threadedly connected inside the oil circuit, and the end of the pressure regulating bolt passes through the outside of the limiting plate.

[0012] Preferably, the upper and lower edges of the limit plate are provided with sliding grooves, and guard plates are slidably connected in the upper and lower sliding grooves, and the guard plates cover the pressure regulating bolts.

[0013] Preferably, one side of the top of the shell is threadedly connected to an inlet bolt, and the other side of the bottom of the shell is threadedly connected to an outlet bolt.

[0014] Preferably, an annular sealing groove is provided on the outer surface of the shell, and the sealing groove is arranged along the outer edge of the hole of the jack; and a sealing strip adapted to the sealing groove is provided on the inner side wall of the limiting plate.

[0015] Preferably, a discharge end cover is provided at the bottom of the shell, and a sealing cover of the discharge end cover covers the lower port of the valve core sleeve.

[0016] Preferably, two groups of fixing seats are symmetrically provided on the outer ring of the shell, the two groups of fixing seats are arranged on both sides of the socket, and the two fixing seats in each group are symmetrically arranged up and down; the upper and lower edges of the end of the limit plate are symmetrically fixed with connecting ears, the end of the limit plate is installed between two adjacent fixing seats, and the connecting ears are connected to the fixing seat by fastening bolts.

[0017] The present invention is beneficial in that: 1. In the present invention, the stop valve is designed so that when the valve seat is damaged, it is not necessary to replace the entire valve body, but only the valve seat needs to be replaced, which can save the cost of using the stop valve. At the same time, the entire valve seat replacement process is simple to operate and has high replacement efficiency. Compared with replacing the entire stop valve, it takes less time and has less impact. In addition, the valve seat and the valve body are simply matched to ensure that the valve body can operate stably for a long time.

[0018] 2. In the present invention, a sealing ring that can be expanded by injecting oil is designed, and the pressure-adjusting bolt is rotated so that the pressure-adjusting bolt moves toward the axis of the housing. At the same time, the pressure-adjusting bolt squeezes the hydraulic oil in the oil circuit and squeezes the hydraulic oil into the sealing ring. The sealing ring bulges due to the hydraulic oil, and the outer surface of the sealing ring is squeezed against the top and bottom surfaces of the sliding layer to seal the gap between the support plate and the sliding layer, thereby ensuring a sealed assembly between the support plate and the sliding layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of a stop valve for oil production pipes in accordance with the present invention; Figure 2 Schematic diagram of the cooperation between the valve core and the valve seat in the present invention; Figure 3 This is a three-dimensional diagram of the matching of the valve body and the housing in the present invention; Figure 4 A three-dimensional diagram of the matching of the discharge end cover and the housing in the present invention; Figure 5 is a three-dimensional diagram of the housing of the present invention; Figure 6 This is a cross-sectional view of the housing and valve body in the present invention; Figure 7 is a three-dimensional diagram of the extension body of the present invention; Figure 8 This is a three-dimensional diagram of the coordination between the clamp and the limiting plate in the present invention; Figure 9 It is a partial cross-sectional view of the extension body of the present invention; Figure 10 Schematic diagram of the cooperation between the guard plate and the pressure regulating bolt in the present invention; Figure 11 It is a three-dimensional diagram of the matching of the housing and the limiting plate in the present invention.

[0020] In the figure: 1. Valve body; 2. Oil inlet end; 3. Oil outlet end; 4. Valve core sleeve; 5. Sliding layer; 6. Valve seat; 7. Valve core; 8. Valve stem; 9. Valve cover; 10. Handwheel; 11. Housing; 12. Socket; 13. Extension body; 14. Limit plate; 15. Support plate; 16. Mounting seat; 17. Hoop; 18. Ring body; 19. Recess; 20. Notch; 21. Limit groove; 22. Boss; 23. Top screw; 24. Annular groove; 25. Sealing ring; 26. Oil circuit; 27. Pressure regulating bolt; 28. Slide; 29. Guard plate; 30. Clamp; 31. Inlet bolt; 32. Outlet bolt; 33. Cavity; 34. Sealing groove; 35. Discharge end cover; 36. Fixing seat; 37. Connecting ear; 38. Fastening bolt. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] Example 1: Reference Figures 1-9 , a petroleum production oil pipeline stop valve, including a valve body 1, the valve body 1 includes an oil inlet end 2 and an oil outlet end 3, a valve core sleeve 4 is provided between the oil inlet end 2 and the oil outlet end 3, the oil outlet of the oil inlet end 2 is communicated with the upper half of the valve core sleeve 4, the oil inlet of the oil outlet end 3 is communicated with the lower half of the valve core sleeve 4, and a sliding layer 5 is radially provided in the middle part of the valve core sleeve 4, a valve seat 6 is provided in the sliding layer 5, and an extension body 13 is provided outside the valve seat 6 and sealedly connected to the sliding layer 5, the extension body 13 can push the valve seat 6 into the sliding layer 5 along the socket 12 provided on the outer ring of the valve body 1, a valve core 7 is provided above the valve seat 6, the top of the valve core 7 is fixedly connected to the valve stem 8, the outer ring of the upper end of the valve stem 8 is threadedly connected to the valve cover 9 provided on the upper end of the valve core sleeve 4, and the upper end of the valve stem 8 is fixedly connected to the handwheel 10, and the handwheel 10 is turned to drive the valve stem 8 to rotate, and the valve stem 8 drives the valve core 7 to move up and down; In this embodiment, the valve seat 6 is detachably mounted on the valve body 1. Without replacing the entire valve body 1, only the valve seat 6 can be replaced to ensure the normal use of the valve body 1. In this embodiment, the specific replacement operation of the valve seat 6 inside the valve body 1 is as follows: first, the pipeline system connected to the valve body 1 is closed to suspend the flow of the medium. Then, the valve stem 8 is rotated to drive the valve core 7 to move upward, and the valve core 7 is separated from the valve seat 6. The valve seat 6 is then removed from the sliding layer 5 through the extension body 13. Then, a new valve seat 6 is replaced on the extension body 13. After that, the extension body 13 is pushed into the valve body 1 along the insertion hole 12. The extension body 13 pushes the new valve seat 8 into the sliding layer 5. At this time, the replacement of the valve seat 8 is completed; When the valve seat 6 of the stop valve is damaged, it is not necessary to replace the entire valve body 1, but only the valve seat 6 needs to be replaced, which can save the cost of using the stop valve. At the same time, the replacement process of the entire valve seat 6 is simple to operate and has high replacement efficiency. Compared with replacing the entire stop valve, it takes less time and has less impact. In addition, the valve seat 6 and the valve body 1 are simply matched to ensure that the valve body 1 can operate stably for a long time.

[0023] Reference Figures 1-9 The valve body 1 also includes a shell 11, which respectively wraps the pipe body of the oil inlet end 2 and the oil outlet end 3, as well as the valve core sleeve 4, and the valve seat 6 is fixed to the shell 11; the extension body 13 includes a limit plate 14 arranged outside the shell 11, and the inner side wall of the limit plate 14 is fixedly connected to a support plate 15, and the end of the support plate 15 is provided with a mounting seat 16 adapted to the outer ring of the valve seat 6; the outer ring of the shell 11 is also provided with a clamp 17, which is used to fasten the limit plate 14 to the shell 11; The outer shell 11 is provided to respectively wrap the pipe body of the oil inlet end 2 and the oil outlet end 3, and the valve core sleeve 4, protecting the oil inlet end 2, the oil outlet end 3 and the valve core sleeve 4, and completely wrapping the valve seat 6, further improving the safety of the valve body 1; When the housing 11 wraps and protects the valve core sleeve 4, an extension body 13 is provided. The extension body 13 is used to support the valve seat 6, so that the valve seat 6 can be smoothly installed in the valve core sleeve 4. Specifically, the extension body 13 is composed of a limit plate 14 and a support plate 15. The end of the support plate 15 is provided with a mounting seat 16 that adapts to the outer ring of the valve seat 6. The valve seat 6 is installed in the mounting seat 16. Then, the end of the support plate 15 passes through the housing 11 along the insertion hole 12 and pushes the valve seat 6 into the sliding layer 5. The end of the support plate 15 is sealed and embedded in the bottom of the sliding layer 5, and the valve seat 6 is opposite to the valve core 7 above it. The limit plate 14 is provided to limit the insertion of the support plate 15 into the outer shell 11, so that the valve seat 6 can be accurately opposite to the valve core 7. At the same time, the limit plate 14 cooperates with the two clamps 17 on the outer shell 11. The clamps 17 are used to fix the limit plate 14 on the outer shell 11 to ensure the stability of the end of the support plate 15 after it is embedded in the sliding layer 5, and also to ensure stable cooperation between the valve seat 6 and the valve core 7.

[0024] Reference Figures 1-9 Two ring bodies 18 are symmetrically provided on the outer ring of the housing 11. Each ring body 18 has a radial recess 19, and a notch 20 is provided at a position opposite to the insertion hole 12. The support plate 15 is inserted into the insertion hole 12, and the two ends of the limit plate 14 are embedded in the notch 20. The clamp 17 is clamped in the recess 19, and the limit plate 14 is fastened to the housing 11. The support plate 15 is inserted along the socket 12, and the end of the limit plate 14 is embedded in the notch 20. The socket 12 can constrain the extension body 13 to swing along the two ends of the valve body 1. The notch 20 can constrain the limit plate 14 to swing along the axis of the valve body 1, and a limit groove 21 for adapting the clamp 17 is provided on the outer surface of both ends of the limit plate 14. The limit groove 21 is neatly opposite to the recess 19, and the clamp 17 can be embedded in the recess 19 and the limit groove 21, further improving the stability of the extension body 13 installed on the outer shell 11, thereby improving the matching stability of the valve seat 6 and the valve core 7.

[0025] Reference Figure 8 , each of the clamps 17 is symmetrically provided with bosses 22 on the outer ring, and each boss 22 is threadedly connected with a top screw 23, which passes through the clamp 17 and presses against the limit plate 14; The extension body 13 is fixed to the shell 11 by the clamp 17. The clamp 17 itself will be subjected to the reaction force of the extension body 13 for a long time, resulting in the problem of deformation and relaxation of the clamp 17. Even if the bolt at the end of the clamp 17 is further tightened, the clamp 17 may not be able to effectively lock the extension body 13 to the shell 11. For this reason, a top screw 23 is provided on the clamp 17. The top screw 23 can assist the clamp 17 in tightening the extension body 13. The top screw 23 is rotated, and the end of the top screw 23 is pressed against the limit plate 14, specifically against the limit groove 21, and the clamp 17 is tightened to firmly lock the limit plate 14 on the shell 11, and extend the service life of the clamp 17 itself.

[0026] Reference Figure 2-Figure 9 Annular grooves 24 are formed on the upper and lower surfaces of the end of the support plate 15, and hollow sealing rings 25 are provided in the two annular grooves 24; an oil passage 26 is formed inside the support plate 15, and the oil passage 26 passes through the annular groove 24 and is connected to the sealing ring 25, and a pressure regulating bolt 27 is threadedly connected to the inside of the oil passage 26, and the end of the pressure regulating bolt 27 passes through the outside of the limit plate 14; After the valve seat 6 is damaged, the sealing between the valve core 7 and the valve seat 6 will be destroyed, and the sealing between the valve seat 6 and the valve body 1 is also crucial. Considering that a sealing rubber ring is provided between the sliding layer 5 and the supporting plate 15, but the supporting plate 15 is assembled in the sliding layer 5 in a radial sliding manner, providing a raised sealing rubber ring on the supporting plate 15 or the end face of the sealing seat will affect the sealing assembly between the supporting plate 15 and the sliding layer 5. For this purpose, a structure that can seal along the axial direction of the valve seat 6 is provided, that is, a hollow sealing ring 25 is provided in this embodiment, and hydraulic oil can be injected into the sealing ring 25 to bulge the sealing gap. The specific operation is as follows: First, rotate the pressure-regulating bolt 27, and the pressure-regulating bolt 27 moves toward the outside of the limit plate 14. The hydraulic oil in the oil circuit 26 drops, and the hydraulic oil in the sealing ring 25 is gradually squeezed into the oil circuit 26. Then install the support plate 15, and the support plate 15 pushes the valve seat 6 into the sliding layer 5. Then, the entire extension body 13 is fastened to the outer shell 11 through the clamp 17. At this time, the sealing ring 25 shrinks into the annular groove 24 under its own elasticity. Then, rotate the pressure-regulating bolt 27, and the pressure-regulating bolt 27 moves toward the axial direction of the outer shell 11. At the same time, the pressure-regulating bolt 27 squeezes the hydraulic oil in the oil circuit 26 and squeezes the hydraulic oil into the sealing ring 25. The sealing ring 25 bulges due to the hydraulic oil, and the outer surface of the sealing ring 25 is squeezed on the top and bottom surfaces of the sliding layer 5 to seal the gap between the support plate 15 and the sliding layer 5, ensuring a sealed assembly between the support plate 15 and the sliding layer 5.

[0027] Reference Figure 3 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10The upper and lower edges of the limit plate 14 are provided with a slide groove 28, and the upper and lower slide grooves 28 are slidably connected with a guard plate 29, which covers the pressure regulating bolt 27; The pressure-regulating bolt 27 is crucial to the sealing of the entire valve body 1. In the oil pipeline system, the flow of the medium will cause vibration of the pipeline and the valve. For the pressure-regulating bolt 27, the vibration will cause the pressure-regulating bolt 27 to rotate on its own, affecting the hydraulic oil pressure in the oil circuit 26, thereby affecting the sealing between the support plate 15 and the sliding layer 5. For this reason, a guard plate 29 is provided on the limit plate 14 to prevent the pressure-regulating bolt 27 from rotating on its own. In this embodiment, two left and right pressure-regulating bolts 27 are provided. The two pressure-regulating bolts 27 each control the hydraulic oil pressure in an oil circuit 26, and each oil circuit 26 is connected to a sealing ring 25; when it is necessary to adjust the two pressure-regulating bolts 27, the pressure-regulating bolt 27 can be adjusted. When the bolt 27 is rotated, the guard plate 29 is pushed to the left or right to expose the two pressure-adjusting bolts 27, and then the two pressure-adjusting bolts 27 are rotated. Thereafter, the guard plate 29 is pushed again to move to a position opposite to the two pressure-adjusting bolts 27. The inner wall of the guard plate 29 presses against the end face of the pressure-adjusting bolt 27 to restrain the movement of the pressure-adjusting bolt 27, or two clamping blocks 30 are symmetrically arranged on the upper and lower inner wall of the guard plate 29. When the pressure-adjusting bolt 27 is rotated, one of the surfaces of the hexagonal heads of the two pressure-adjusting bolts 27 is in a horizontal state. In the sliding guard plate 29, the clamping block 30 can clamp the head of the pressure-adjusting thread, further restraining the self-rotation of the pressure-adjusting bolt 27.

[0028] Reference Figure 6 , one side of the top of the housing 11 is threadedly connected to an inlet bolt 31, and the other side of the bottom of the housing 11 is threadedly connected to an outlet bolt 32; The housing 11 and the valve body 1 form a plurality of communicating cavities 33, such as Figure 6 As shown, there are two cavities 33 at the upper and lower positions of the oil inlet end 2, and two cavities 33 at the upper and lower positions of the oil outlet end 3. The cavities 33 are connected together. An inlet bolt 31 and an outlet bolt 32 are provided on the shell 11. The inlet bolt 31 and the outlet bolt 32 are loosened and removed, and hot water is injected into the connection position with the inlet bolt 31 on the shell 11. The hot water flows out from the connection position with the outlet bolt 32 on the shell 11, and the hot water heats the entire valve body 1 to heat the medium in the valve body 1. In the case that the valve body 1 is frozen, it can be quickly heated and unblocked in this way, so that the valve body 1 can be quickly put into use.

[0029] Reference Figure 5 The outer surface of the housing 11 is provided with a ring-shaped sealing groove 34, and the sealing groove 34 is provided along the outer edge of the hole 12; the inner wall of the limiting plate 14 is provided with a sealing strip adapted to the sealing groove 34; The sealing groove 34 is provided in conjunction with the sealing strip to seal the gap between the limit plate 14 and the outer shell 11. Even if part of the medium flows out from the gap between the sliding layer 5 and the support plate 15, the medium will first drip into the outer shell 11 to temporarily store the leaked medium to prevent the medium from polluting the environment. When the valve body 1 is subsequently maintained, the sealing between the support plate 15 and the sliding layer 5 will be further processed, and the leaked medium inside the outer shell 11 will be cleaned at the same time.

[0030] Reference Figure 4 The bottom of the housing 11 is provided with a discharge end cover 35, and the discharge end cover 35 seals and covers the lower end of the valve core sleeve 4; The discharge end cover 35 is fixed to the outer shell 11 by multiple bolts. Open the discharge end cover 35 and check the internal condition of the sliding layer 5 from the bottom of the valve body 1, or thoroughly clean the oil deposited inside the sliding layer 5 to ensure the precise assembly of the subsequent support plate 15 and the sliding layer 5.

[0031] Example 2: Reference Figure 11 As another embodiment of the present invention, two groups of fixing seats 36 are symmetrically provided on the outer ring of the housing 11. The two groups of fixing seats 36 are arranged on both sides of the insertion hole 12, and the two fixing seats 36 in each group are symmetrically arranged in the upper and lower directions. The upper and lower edges of the end of the limit plate 14 are symmetrically fixed with connecting ears 37. The end of the limit plate 14 is installed between two adjacent fixing seats 36. The connecting ears 37 are connected to the fixing seats 36 by fastening bolts 38. The extension body 13 can be directly and firmly assembled to the housing 11 by a plurality of fastening bolts 38 , without considering the frequent replacement of the subsequent valve seat 6 . This fixing method is suitable for valve bodies 1 with low operating frequency and valve seats 6 with low damage frequency.

[0032] Working principle: After the closure is closed, the valve core 7 is disengaged from the valve seat 6 and the valve core 7 is disengaged from the valve seat 6. The valve seat 6 is then removed from the sliding layer 5 by the extension body 13, and a new valve seat 6 is replaced on the extension body 13. The extension body 13 is then pushed into the valve body 1 along the insertion hole 12, and the extension body 13 pushes the new valve seat 8 into the sliding layer 5. At this time, the replacement of the valve seat 8 is completed. After the valve seat 6 is damaged, the stop valve does not need to replace the entire valve body 1, but only the valve seat 6 needs to be replaced, which can save the cost of using the stop valve. At the same time, the replacement process of the entire valve seat 6 is simple to operate and has high replacement efficiency. Compared with replacing the entire stop valve, it takes less time and has less impact. The valve seat 6 and the valve body 1 cooperate in a simple way, which can ensure the long-term stable operation of the valve body 1.

[0033] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A stop valve for oil production pipeline, characterized by: The closure of the valve core is connected to the closure of the valve body by a threaded connection, and the closure of the valve core is connected to the closure of the valve body by a threaded connection.

2. The oil production oil pipeline stop valve according to claim 1, characterized in that: The valve body further comprises a shell, which respectively covers the pipe body at the oil inlet end and the oil outlet end, as well as the valve core sleeve, and the valve seat is fixedly connected to the shell; The extension body includes a limit plate arranged outside the shell, the inner side wall of the limit plate is fixedly connected to a support plate, and the end of the support plate is provided with a mounting seat adapted to the outer ring of the valve seat; The outer ring of the shell is also provided with a clamp, which is used to fasten the limiting plate to the shell.

3. The oil production oil pipeline stop valve according to claim 2, characterized in that: Two ring bodies are symmetrically provided on the outer ring of the shell, each ring body has a radial recess, and a notch is provided at the position opposite to the jack. The support plate is inserted into the jack, the two ends of the limit plate are embedded in the notch, the clamp is clamped in the recess, and the limit plate is fastened to the shell.

4. The oil production oil pipe stop valve according to claim 3, characterized in that: Bosses are symmetrically provided on the outer ring of each clamp, and each boss is threadedly connected with a top screw, which passes through the clamp and presses against the limit plate.

5. The oil production oil pipeline stop valve according to claim 3, characterized in that: Annular grooves are provided on the upper and lower surfaces of the end of the support plate, and hollow sealing rings are provided in both annular grooves; An oil circuit is provided inside the supporting plate, the oil circuit passes through the annular groove and is connected to the sealing ring, and a pressure regulating bolt is threadedly connected inside the oil circuit, and the end of the pressure regulating bolt passes through the outside of the limiting plate.

6. The oil production oil pipeline stop valve according to claim 5, characterized in that: The upper and lower edges of the limit plate are provided with sliding grooves, and guard plates are slidably connected in the upper and lower sliding grooves, and the guard plates cover the pressure regulating bolts.

7. The oil production oil pipeline stop valve according to claim 3, characterized in that: One side of the top of the shell is threadedly connected with an inlet bolt, and the other side of the bottom of the shell is threadedly connected with an outlet bolt.

8. The oil production oil pipeline stop valve according to claim 6, characterized in that: The outer surface of the shell is provided with a ring-shaped sealing groove, which is arranged along the outer edge of the hole of the jack; the inner side wall of the limiting plate is provided with a sealing strip adapted to the sealing groove.

9. The oil production oil pipeline stop valve according to claim 8, characterized in that: A discharge end cover is provided at the bottom of the shell, and a sealing cover of the discharge end cover covers the lower port of the valve core sleeve.

10. The oil production oil pipeline stop valve according to claim 2, characterized in that: Two groups of fixing seats are symmetrically provided on the outer ring of the shell, and the two groups of fixing seats are arranged on both sides of the socket, and the two fixing seats in each group are symmetrically arranged up and down; the upper and lower edges of the end of the limit plate are symmetrically fixed with connecting ears, and the end of the limit plate is installed between two adjacent fixing seats, and the connecting ears are connected to the fixing seat by fastening bolts.

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