Assembled pressure self-sealing stop valve and use method thereof

Abstract

The present invention discloses an assembled pressure self-sealing stop valve and a method of using the same, including a valve body for installing and protecting an internal structure, a bracket detachably mounted on the top of the valve body for limiting the position of an internal valve stem, a clamp wrapped around the connection between the valve body and the bracket for connecting and fixing the valve body and the bracket, a drive mechanism bolted to the top of the bracket for driving and adjusting the internally connected valve stem, and a valve stem movably connected to the interior of the valve body. The present invention pre-installs the sealing assembly and lubrication assembly to be installed on the outer wall of the valve stem, so that the valve stem can be loaded into the interior of the valve body together with the sealing assembly and the lubrication assembly, thereby improving the assembly efficiency of the stop valve, and the use of the lubrication assembly can add lubricating oil to the outer wall of the frequently used valve stem, so that it remains lubricated during the up and down movement, thereby reducing the degree of wear of the components connected to the outer wall.

Description

Technical Field

[0001] The invention relates to the technical field of stop valve application, and in particular to an assembled pressure self-sealing stop valve and a use method thereof. Background Art

[0002] Pressure self-sealing stop valve is a valve used in high-pressure environment. It is mainly used to cut off, connect and adjust the flow direction of fluid. Due to its good sealing performance and high temperature and high pressure resistance, pressure self-sealing stop valve is widely used in industrial fields such as petroleum, chemical industry, and electric power, especially in occasions that require frequent switching or strict cutting off functions.

[0003] During the assembly process of the existing stop valve, it is necessary to pre-install the internal valve stem into the interior of the valve body, and then the sealing component on the valve stem is installed by sleeve connection. Since the internal space of the valve body is small, the assembly is difficult, which is not conducive to regular inspection and maintenance of the stop valve. In addition, during long-term use, the lubrication effect between the valve stem and the sealing component will be reduced, the wear between the valve stem and the sealing component will be increased, and the service life of the sealing component will be reduced. Therefore, the present invention proposes an assembled pressure self-sealing stop valve and a method for using the same. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an assembled pressure self-sealing stop valve and a method of using the same. The sealing component and lubrication component to be installed are pre-installed on the outer wall of the valve stem, so that the valve stem can be installed into the interior of the valve body together with the sealing component and the lubrication component, thereby improving the assembly efficiency of the stop valve. The lubrication component can also be used to add lubricating oil to the outer wall of the valve stem that is frequently used, so that it remains lubricated during its up and down movement, thereby reducing the degree of wear of the components connected to the outer wall.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide an assembled pressure self-sealing stop valve, including a valve body, which is used to install and protect the internal structure; the bracket is detachably mounted on the top of the valve body, and is used to limit the position of the internal valve stem; the clamp is wrapped around the connection between the valve body and the bracket, and is used to connect and fix the valve body and the bracket; the driving mechanism is bolted to the top of the bracket, and is used to drive and adjust the internally connected valve stem; the valve stem is movably connected to the inside of the valve body, and is used to open and close the channel inside the valve body; the The positioning sealing plate is sleeved on the outer wall of the valve stem and installed on the inner wall of the valve body near the bottom, which is used to isolate and seal the inner cavity of the valve body. The lubrication assembly is sleeved on the outer wall of the valve stem and snap-connected to the top position of the positioning sealing plate, which is used to provide lubricating oil to the outer wall of the valve stem. The valve cover assembly is sleeved on the outer wall of the valve stem and installed at the top position of the valve body. At the same time, the bottom of the bracket presses and fixes it, which is used to further seal the valve stem connection. The rubber bellows is embedded in the bottom of the positioning sealing plate, which is used to seal the connection between the moving valve stem and the positioning sealing plate.

[0006] The present invention is further configured as follows: a through hole is opened near the middle of the outer wall of the valve body, and the through hole is filled with a rubber plug, and the rubber plug corresponds to the middle of the outer wall of the lubrication component.

[0007] Through the above technical solution, it is convenient to use the rubber stopper to inject lubricating oil into the interior of the lubricating component using an external syringe.

[0008] The present invention is further configured as follows: a limit movable groove is symmetrically opened on the outer wall of the bracket near the top position, a fixed sleeve is sleeved on the outer wall of the valve stem near the end surface position, a limit column is symmetrically arranged on the side wall of the fixed sleeve, and the outer wall of the limit column is slidably connected to the inner wall of the limit movable groove.

[0009] Through the above technical solution, when the valve stem is driven, it can slide inside the limiting movable groove through the limiting column outside the fixed sleeve, thereby improving the stability of the valve stem during adjustment.

[0010] The present invention is further configured as follows: the driving mechanism includes a shell bolted to the top of the bracket, a driving motor is bolted to one side of the shell, a bevel gear A is installed on the end face of the driving shaft of the driving motor, the outer wall of the bevel gear A is meshingly connected with a bevel gear B, the inner wall of the bevel gear B is threadedly connected to the outer wall of the threaded rod fixedly connected to the top of the valve stem, and the bevel gear B is rotatably connected to the inner wall of the shell through a bearing sleeved on its outer wall.

[0011] Through the above technical solution, the drive motor is started, and its output shaft drives the bevel gear A on the end face to rotate, so that the meshing bevel gear B rotates on the bearing, and the threaded rod connected with the internal thread drives the valve stem at the bottom to move up and down, so that the valve disc and valve seat at the bottom are pressed against and separated from each other, thereby realizing the opening and closing operation of the stop valve.

[0012] The present invention is further configured as follows: a valve disc is threadedly connected to the bottom of the valve stem, and the bottom of the valve disc is chamfered and tightly pressed against the valve seat inside the valve body; an extrusion block is sleeved on the outer wall of the valve stem near the top of the valve disc, and the extrusion block can be pressed against the inclined surface B set at the bottom position of the inner wall of the positioning sealing plate through the inclined surface A set on the top thereof.

[0013] Through the above technical solution, when the valve stem is lifted, it can be pressed against the inner wall of the inclined surface B through the extrusion block, thereby sealing and reinforcing the connection and improving the sealing between the valve stem and the positioning sealing plate.

[0014] The present invention is further configured as follows: an embedding groove A and an embedding groove B are respectively opened at relative positions of the top of the valve disc and the bottom of the positioning sealing plate, and the two end surfaces of the rubber bellows are respectively embedded in the embedding groove A and the embedding groove B, and the extrusion block is wrapped inside.

[0015] Through the above technical solution, when the valve stem is lifted, it can squeeze the rubber bellows, and under the action of the rubber bellows, the sealing between the valve stem and the positioning sealing plate is improved, thereby increasing the service life of the positioning sealing plate.

[0016] The present invention is further configured as follows: the lubrication assembly includes an oil storage shell, the middle portion of the oil storage shell is configured as a rubber edge, the inner arc wall of the oil storage shell is configured as an opening, the opening position of which is filled with a sponge, and a snap-fit ​​groove is configured at the bottom of the oil storage shell near the inner wall, and is sleeved on an extension portion configured at the top of the positioning sealing plate through the snap-fit ​​groove.

[0017] Through the above technical solution, the lubricating oil inside the oil storage shell can be applied to the outer wall of the valve stem using the internal sponge, so that the valve stem can remain lubricated, and the lubricating oil can be injected into the interior of the oil storage shell using a syringe through the external rubber stopper.

[0018] The present invention is further configured as follows: the valve cover assembly includes a sealing block, a plurality of sealing scrapers are evenly arranged on the inner wall of the sealing block near the bottom, a plurality of drainage holes are opened at the intervals between the three sealing scrapers at the bottom, a packing layer is arranged on the inner wall of the sealing block near the middle, a compression sleeve is threadedly connected to the inner wall of the sealing block near the top, and a spring is sleeved on the outer wall of the compression sleeve.

[0019] Through the above technical scheme, multiple sealing scrapers can be used to seal the outer wall of the valve body to prevent the fluid from being carried out after leakage from the bottom, and multiple drainage holes can be used to discharge the carried fluid, thereby improving the sealing effect of the sealing block. At the same time, the packing layer compressed by the compression sleeve can further increase the sealing effect between the sealing block and the valve stem.

[0020] The present invention is further configured as follows: the top surface extension of the compression sleeve is pressed against the top of the spring, and the bottom of the spring is pressed against the inside of the positioning groove opened on the top of the sealing block, and at the same time, the bottom of the compression sleeve is pressed against the top of the packing layer.

[0021] Through the above technical solution, the internal packing layer can be tightly compressed by using the compression sleeve to improve the sealing effect, and the compression sleeve can be tightly fixed by using the spring to prevent loosening during use.

[0022] On the other hand, a method for using an assembled pressure self-sealing stop valve is provided, comprising the following steps: S1. First, thread the valve disc onto the bottom of the valve stem; S2. Then, put the rubber bellows on the valve stem so that its bottom is embedded into the inside of the embedding groove A; S3, then the lubrication assembly is engaged with the top of the positioning sealing plate through the engagement groove at the bottom thereof, and after being assembled, the lubrication assembly is sleeved on the outer wall of the valve stem as a whole, so that the internal sponge body fits the outer wall of the valve stem to maintain the lubrication of the outer wall of the valve stem, and at the same time, the top of the rubber bellows is embedded into the embedding groove B at the bottom of the positioning sealing plate to achieve fixation; S4, then sleeve the sealing block on the outer wall of the valve stem, fill the packing layer at the connection between the valve stem and the sealing block, and sleeve the compression sleeve on the valve stem so that it is threadedly connected with the inner wall of the sealing block, thereby compressing the internal packing layer, and at the same time, the stability of the installation can be achieved by cooperating with the spring after compression; S5, then install the components installed on the valve stem into the interior of the valve body through the valve stem, and press the lubrication component in advance, so that the positioning sealing plate at the bottom can be installed in the groove opened at the corresponding position of the inner wall of the valve body, so as to achieve fixation, and make the rubber edge inside the lubrication component correspond to the rubber plug outside; S6. Then, the entire valve cover assembly is pressed to make it slide on the valve stem so that the sealing block fits tightly on the top of the valve body, and the compression sleeve is rotated again to further strengthen the compression effect on the internal packing layer; S7. Then, fix the bracket to the top of the valve body through a clamp, and install the fixing sleeve on the outer wall of the valve stem near the top, so that the limit columns on both sides are slidably connected to the inside of the limit movable groove; S8. Finally, bolt the housing to the top of the bracket, and thread the internal bevel gear B to the outer wall of the threaded rod; S9. When the stop valve needs to be opened and closed, it is only necessary to start the driving motor. Its output shaft drives the bevel gear A on the end face to rotate, so that the meshing bevel gear B rotates on the bearing, and the threaded rod connected with the internal thread drives the valve stem at the bottom to move up and down, so that the valve disc and valve seat at the bottom are pressed against and separated from each other, thereby realizing the operation of opening and closing the stop valve.

[0023] The beneficial effects of the present invention are as follows: 1. The present invention proposes an assembled pressure self-sealing stop valve and a method for using the same, by pre-installing the sealing assembly and lubricating assembly to be installed on the outer wall of the valve stem, so that the valve stem can be installed into the interior of the valve body together with the sealing assembly and the lubricating assembly, thereby improving the assembly efficiency of the stop valve; 2. The assembled pressure self-sealing stop valve and its use method proposed by the present invention can add lubricating oil to the outer wall of the frequently used valve stem by using a lubricating component, so that it can maintain lubrication during the up and down movement, reducing the degree of wear of the parts connected to the outer wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a first structural diagram of the present invention; Figure 2 is a second structural diagram of the present invention; Figure 3 It is a cross-sectional structural diagram of the present invention; Figure 4 It is a structural diagram of the valve stem in the present invention; Figure 5 for Figure 3 The enlarged view of point A in the middle; Figure 6 for Figure 3 The enlarged view of point B in the middle; Figure 7 for Figure 3 Enlarged view of point C in the middle.

[0025] In the figure: 1. valve body; 11. rubber plug; 2. Bracket; 21. Position limiting movable slot; 3. Hoop; 4. Driving mechanism; 41. Housing; 42. Driving motor; 43. Bevel gear A; 44. Bevel gear B; 45. Bearing; 5. Valve stem; 51. Valve disc; 511. Embedding groove A; 52. Extrusion block; 521. Inclined surface A; 53. Fixed sleeve; 531. Limiting column; 54. Threaded rod; 6. Positioning sealing plate; 61. Embedding groove B; 62. Inclined surface B; 7. Lubrication assembly; 71. Oil storage shell; 72. Rubber edge; 73. Sponge body; 74. Engagement groove; 8. Valve cover assembly; 81. Sealing block; 82. Sealing scraper; 83. Drain hole; 84. Packing layer; 85. Compression sleeve; 86. Spring; 87. Positioning groove; 9. Rubber bellows. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0027] like Figure 1-Figure 4 As shown, an assembled pressure self-sealing stop valve includes a valve body 1 for installing and protecting the internal structure. A through hole is opened near the middle of the outer wall of the valve body 1, and a rubber plug 11 is filled in the through hole. The rubber plug 11 corresponds to the middle of the outer wall of the lubricating component 7, so that the lubricating oil can be injected into the lubricating component 7 by using an external syringe using the rubber plug 11. The bracket 2 is detachably mounted on the top of the valve body 1 to limit the position of the internal valve stem 5. The outer wall of the bracket 2 is symmetrical near the top. A limit movable groove 21 is opened, and a fixing sleeve 53 is sleeved on the outer wall of the valve stem 5 near the end face. The side wall of the fixing sleeve 53 is symmetrically provided with a limit column 531, and the outer wall of the limit column 531 is slidably connected to the inner wall of the limit movable groove 21, so that when the valve stem 5 is driven, it can slide inside the limit movable groove 21 through the limit column 531 outside the fixing sleeve 53, thereby improving the stability of the valve stem 5 during adjustment. The clamp 3 is wrapped around the connection between the valve body 1 and the bracket 2, and is used to connect and fix the valve body 1 and the bracket 2.

[0028] like Figure 3 As shown, the driving mechanism 4 is bolted to the top of the bracket 2, and is used to drive and adjust the internally connected valve stem 5. The driving mechanism 4 includes a shell 41 bolted to the top of the bracket 2, and a driving motor 42 is bolted to one side of the shell 41. A bevel gear A43 is installed on the end face of the driving shaft of the driving motor 42. The outer wall of the bevel gear A43 is meshedly connected with a bevel gear B44. The inner wall of the bevel gear B44 is threadedly connected to the outer wall of the threaded rod 54 fixedly connected to the top of the valve stem 5, and the bevel gear B44 is rotatably connected to the inner wall of the shell 41 through a bearing 45 sleeved on its outer wall. When the driving motor 42 is started, its output shaft drives the bevel gear A43 on the end face to rotate, so that the meshed bevel gear B44 rotates on the bearing 45, and the threaded rod 54 with the internal thread connection drives the valve stem 5 at the bottom to move up and down, so that the valve disc 51 and the valve seat at the bottom are pressed against and away from each other, thereby realizing the opening and closing operation of the stop valve.

[0029] like Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, the valve stem 5 is movably connected to the inside of the valve body 1, and is used to open and close the channel inside the valve body 1. The bottom of the valve stem 5 is threadedly connected with a valve flap 51, and the top of the valve flap 51 and the bottom of the positioning sealing plate 6 are respectively provided with an embedding groove A511 and an embedding groove B61 at relative positions. The rubber bellows 9 is embedded in the bottom of the positioning sealing plate 6 to seal the connection between the movable valve stem 5 and the positioning sealing plate 6. The two end faces of the rubber bellows 9 are respectively embedded in the embedding groove A511 and the embedding groove B61, and the extrusion block 52 is wrapped inside, so that when the valve stem 5 is lifted, it can extrude the rubber bellows 9 and And under the action of the rubber bellows 9, the sealing between the valve stem 5 and the positioning sealing plate 6 is improved, thereby increasing the service life of the positioning sealing plate 6. The bottom of the valve disc 51 is chamfered and tightly pressed against the valve seat inside the valve body 1. The outer wall of the valve stem 5 is sleeved with an extrusion block 52 near the top of the valve disc 51. The extrusion block 52 can press against the inclined surface B62 set at the bottom position of the inner wall of the positioning sealing plate 6 through the inclined surface A521 set at its top. When the valve stem 5 is lifted, it can press against the inner wall of the inclined surface B62 through the extrusion block 52, thereby sealing and reinforcing the connection, thereby improving the sealing between the valve stem 5 and the positioning sealing plate 6.

[0030] like Figure 3 and Figure 5 As shown, the positioning sealing plate 6 is sleeved on the outer wall of the valve stem 5 and installed on the inner wall of the valve body 1 near the bottom, which is used to isolate and seal the inner cavity of the valve body 1. The lubricating component 7 is sleeved on the outer wall of the valve stem 5 and is snap-connected to the top position of the positioning sealing plate 6 to provide lubricating oil to the outer wall of the valve stem 5. The lubricating component 7 includes an oil storage shell 71. The middle part of the oil storage shell 71 is set as a rubber edge 72. The inner arc wall of the oil storage shell 71 is set as an opening, and its opening position is filled with a sponge 73. The bottom of the oil storage shell 71 is provided with a snap-fit ​​groove 74 near the inner wall, and is sleeved on the extension part set on the top of the positioning sealing plate 6 through the snap-fit ​​groove 74. The internal sponge 73 can be used to apply the lubricating oil inside the oil storage shell 71 to the outer wall of the valve stem 5, so that the valve stem 5 can be kept lubricated, and the lubricating oil can be injected into the interior of the oil storage shell 71 using a syringe through the external rubber plug 11.

[0031] like Figure 3 and Figure 6As shown, the valve cover assembly 8 is sleeved on the outer wall of the valve stem 5 and installed at the top position of the valve body 1, and the bottom of the bracket 2 presses and fixes it, which is used to further seal the connection of the valve stem 5. The valve cover assembly 8 includes a sealing block 81, and the inner wall of the sealing block 81 is evenly provided with a plurality of sealing scrapers 82 near the bottom position, and a plurality of drainage holes 83 are opened at the intervals of the three sealing scrapers 82 at the bottom. A packing layer 84 is provided near the middle position of the inner wall of the sealing block 81, and a compression sleeve 85 is threadedly connected to the inner wall of the sealing block 81 near the top position. The top surface extension of the compression sleeve 85 is pressed against the top of the spring 86, and the bottom of the spring 86 is pressed against the fixed hole opened at the top of the sealing block 81. The inner portion of the positioning groove 87, and the bottom of the compression sleeve 85 is pressed against the top of the packing layer 84. The compression sleeve 85 can be used to tightly compress the internal packing layer 84 to improve the sealing effect, and the spring 86 can be used to tightly fix the compression sleeve 85 to prevent loosening during use. The outer wall of the compression sleeve 85 is sleeved with a spring 86, and a plurality of sealing scrapers 82 can be used to seal the outer wall of the valve body 5 to prevent the fluid from being carried out after the bottom leaks, and a plurality of drainage holes 83 can be used to discharge the carried fluid, thereby improving the sealing effect of the sealing block 81. At the same time, the packing layer 84 compressed by the compression sleeve 85 can further increase the sealing effect between the sealing block 81 and the valve stem 5.

[0032] like Figure 1-Figure 7 As shown, a method for using an assembled pressure self-sealing stop valve comprises the following steps; S1. First, thread the valve disc 51 onto the bottom of the valve stem 5; S2, then put the rubber bellows 9 on the valve stem 5, so that its bottom is embedded in the embedding groove A511; S3, then the lubrication assembly 7 is engaged with the top of the positioning sealing plate 6 through the engagement groove 74 at the bottom thereof, and after being assembled, the lubrication assembly 7 is sleeved on the outer wall of the valve stem 5 as a whole, so that the internal sponge 73 fits the outer wall of the valve stem 5 to keep the lubrication of the outer wall of the valve stem 5, and at the same time, the top of the rubber bellows 9 is embedded into the embedding groove B61 at the bottom of the positioning sealing plate 6 to achieve fixation; S4, then the sealing block 81 is sleeved on the outer wall of the valve stem 5, the packing layer 84 is filled at the connection between the valve stem 5 and the sealing block 81, and the compression sleeve 85 is sleeved on the valve stem 5, so that it is threadedly connected with the inner wall of the sealing block 81, and then the internal packing layer 84 is compressed, and the compression spring 86 is used to achieve installation stability; S5, then install the components installed on the valve stem 5 into the interior of the valve body 1 through the valve stem 5, and press the lubricating component 7 in advance, so that the positioning sealing plate 6 at the bottom can be installed in the groove opened at the corresponding position of the inner wall of the valve body 1, so as to achieve fixation, and make the rubber edge 72 inside the lubricating component 7 correspond to the external rubber plug 11; S6. Then, the entire valve cover assembly 8 is pressed to make it slide on the valve stem 5, so that the sealing block 81 is tightly fitted on the top of the valve body 1, and the compression sleeve 85 is rotated again to further strengthen the compression effect on the internal packing layer 84; S7, then fix the bracket 2 to the top of the valve body 1 through the clamp 3, and install the fixing sleeve 53 on the outer wall of the valve stem 5 near the top, and make the limiting columns 531 on both sides slidably connected to the inside of the limiting movable groove 21; S8, finally bolt the housing 41 to the top of the bracket 2, and make the internal bevel gear B44 threadedly connected to the outer wall of the threaded rod 54; S9. When the stop valve needs to be opened and closed, it is only necessary to start the driving motor 42. Its output shaft drives the bevel gear A43 on the end face to rotate, so that the meshing bevel gear B44 rotates on the bearing 45, and the threaded rod 54 connected with the internal thread drives the bottom valve stem 5 to move up and down, so that the bottom valve disc 51 and the valve seat are pressed against and separated from each other, thereby realizing the operation of opening and closing the stop valve.

[0033] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An assembled pressure self-sealing stop valve, characterized in that: include A valve body (1) is used to install and protect the internal structure; A bracket (2), the bracket (2) being detachably mounted on the top of the valve body (1) and used for limiting the position of the internal valve stem (5); A clamp (3), the clamp (3) being wrapped around the connection between the valve body (1) and the bracket (2) and being used to connect and fix the valve body (1) and the bracket (2); A driving mechanism (4), the driving mechanism (4) being bolted to the top of the bracket (2) and used for driving and adjusting the valve stem (5) connected inside; A valve stem (5), the valve stem (5) being movably connected to the interior of the valve body (1) and used for opening and closing the passage inside the valve body (1); A positioning sealing plate (6), the positioning sealing plate (6) being sleeved on the outer wall of the valve stem (5) and installed on the inner wall of the valve body (1) near the bottom, and being used to isolate and seal the inner cavity of the valve body (1); a lubrication assembly (7), the lubrication assembly (7) being sleeved on the outer wall of the valve stem (5) and being snap-connected to the top position of the positioning sealing plate (6) and being used for providing lubrication oil to the outer wall of the valve stem (5); A valve cover assembly (8), wherein the valve cover assembly (8) is sleeved on the outer wall of the valve stem (5) and installed at the top of the valve body (1), and is pressed and fixed by the bottom of the bracket (2) to further seal the connection of the valve stem (5); A rubber bellows (9) is embedded in the bottom of the positioning sealing plate (6) and is used to seal the connection between the movable valve stem (5) and the positioning sealing plate (6).

2. The assembled pressure self-sealing stop valve according to claim 1, characterized in that: A through hole is provided near the middle of the outer wall of the valve body (1), and a rubber plug (11) is filled inside the through hole, and the rubber plug (11) corresponds to the middle of the outer wall of the lubrication assembly (7).

3. The assembled pressure self-sealing stop valve according to claim 1, characterized in that: The outer wall of the bracket (2) is symmetrically provided with a limit movable groove (21) near the top, the outer wall of the valve stem (5) is sleeved with a fixing sleeve (53) near the end surface, the side wall of the fixing sleeve (53) is symmetrically provided with a limit column (531), and the outer wall of the limit column (531) is slidably connected to the inner wall of the limit movable groove (21).

4. The assembled pressure self-sealing stop valve according to claim 1, characterized in that: The driving mechanism (4) comprises a housing (41) bolted to the top of the bracket (2); a driving motor (42) is bolted to one side of the housing (41); a bevel gear A (43) is mounted on the end face of the driving shaft of the driving motor (42); the outer wall of the bevel gear A (43) is meshingly connected to a bevel gear B (44); the inner wall of the bevel gear B (44) is threadedly connected to the outer wall of a threaded rod (54) fixedly connected to the top of the valve stem (5); and the bevel gear B (44) is rotatably connected to the inner wall of the housing (41) via a bearing (45) sleeved on the outer wall thereof.

5. The assembled pressure self-sealing stop valve according to claim 1, characterized in that: The bottom of the valve stem (5) is threadedly connected to a valve flap (51), and the bottom of the valve flap (51) is chamfered and tightly pressed against a valve seat inside the valve body (1). An extrusion block (52) is sleeved on the outer wall of the valve stem (5) near the top of the valve flap (51), and the extrusion block (52) can press against an inclined surface B (62) set at the bottom of the inner wall of the positioning sealing plate (6) through an inclined surface A (521) set at the top.

6. The assembled pressure self-sealing stop valve according to claim 5, characterized in that: An embedding groove A (511) and an embedding groove B (61) are respectively provided at relative positions on the top of the valve flap (51) and the bottom of the positioning sealing plate (6); both end surfaces of the rubber bellows (9) are respectively embedded in the embedding groove A (511) and the embedding groove B (61), and the extrusion block (52) is wrapped therein.

7. The assembled pressure self-sealing stop valve according to claim 1, characterized in that: The lubrication assembly (7) comprises an oil storage shell (71), the middle portion of the oil storage shell (71) is provided with a rubber edge (72), the inner arc wall of the oil storage shell (71) is provided with an opening, the opening position of which is filled with a sponge (73), and a snap-fit ​​groove (74) is provided at the bottom of the oil storage shell (71) near the inner wall, and is sleeved on an extension portion provided at the top of the positioning sealing plate (6) through the snap-fit ​​groove (74).

8. The assembled pressure self-sealing stop valve according to claim 1, characterized in that: The valve cover assembly (8) comprises a sealing block (81), a plurality of sealing scrapers (82) are evenly arranged on the inner wall of the sealing block (81) near the bottom, a plurality of drainage holes (83) are provided at intervals between three sealing scrapers (82) at the bottom, a packing layer (84) is arranged near the middle of the inner wall of the sealing block (81), a compression sleeve (85) is threadedly connected to the inner wall of the sealing block (81) near the top, and a spring (86) is sleeved on the outer wall of the compression sleeve (85).

9. The assembled pressure self-sealing stop valve according to claim 8, characterized in that: The top surface extension of the compression sleeve (85) is pressed against the top of the spring (86), and the bottom of the spring (86) is pressed against the inside of a positioning groove (87) opened at the top of the sealing block (81), while the bottom of the compression sleeve (85) is pressed against the top of the packing layer (84).

10. A method for using an assembled pressure self-sealing stop valve according to any one of claims 1 to 9, characterized in that: The steps include: S1. First, thread the valve disc (51) onto the bottom of the valve stem (5); S2. Then, the rubber bellows (9) is put on the valve stem (5) so that its bottom is embedded in the embedding groove A (511); S3, then the lubrication assembly (7) is engaged with the top of the positioning sealing plate (6) through the engagement groove (74) at the bottom thereof, and after the assembly, the lubrication assembly (7) is sleeved on the outer wall of the valve stem (5) as a whole, so that the sponge body (73) inside fits the outer wall of the valve stem (5) to maintain the lubrication of the outer wall of the valve stem (5), and at the same time, the top of the rubber bellows (9) is embedded in the embedding groove B (61) at the bottom of the positioning sealing plate (6) to achieve fixation; S4, then sleeve the sealing block (81) onto the outer wall of the valve stem (5), fill the packing layer (84) at the connection between the valve stem (5) and the sealing block (81), and sleeve the compression sleeve (85) onto the valve stem (5) so that it is threadedly connected to the inner wall of the sealing block (81), thereby compressing the internal packing layer (84), and at the same time, the compression spring (86) can achieve installation stability; S5, then, the components mounted on the valve stem (5) are installed together into the interior of the valve body (1) through the valve stem (5), and the lubricating component (7) is pressed in advance, so that the positioning sealing plate (6) at the bottom can be installed in the groove opened at the corresponding position of the inner wall of the valve body (1), thereby achieving fixation, and making the rubber edge (72) inside the lubricating component (7) correspond to the rubber plug (11) outside; S6. Then, the entire valve cover assembly (8) is pressed to make it slide on the valve stem (5), so that the sealing block (81) is tightly fitted on the top of the valve body (1), and the compression sleeve (85) is rotated again to further strengthen the compression effect on the internal packing layer (84); S7, then fix the bracket (2) to the top of the valve body (1) through the clamp (3), and install the fixing sleeve (53) on the outer wall of the valve stem (5) near the top, so that the limiting columns (531) on both sides are slidably connected to the inside of the limiting movable groove (21); S8. Finally, bolt the housing (41) to the top of the bracket (2), and thread the internal bevel gear B (44) to the outer wall of the threaded rod (54); S9. When the stop valve needs to be opened or closed, the drive motor (42) only needs to be started. The output shaft of the drive motor (42) drives the bevel gear A (43) on the end surface to rotate, so that the meshing bevel gear B (44) rotates on the bearing (45), and the threaded rod (54) connected with the internal thread drives the valve stem (5) at the bottom to move up and down, so that the valve disc (51) and the valve seat at the bottom are pressed against and separated from each other, thereby realizing the operation of opening and closing the stop valve.

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