A combined stop valve

Abstract

The application discloses a combined stop valve and belongs to the technical field of stop valve equipment, which comprises a valve body, a filtering mechanism is installed at the bottom of the valve body, a first valve cover is fixedly connected to the top center of the valve body, a flow guiding mechanism is installed on one side of the outer wall of the first valve cover, a sealing mechanism is installed at the inner center of the first valve cover, a second valve cover is fixedly connected to the top center of the first valve cover, and an adjusting mechanism is installed at the inner center of the second valve cover. The flow guiding mechanism is designed, only small-flow fluid needs to be treated, accurate adjustment of large fluid is realized, the energy consumption is relatively low, the device is less worn, the service life is relatively long, and the maintenance cost is relatively low.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of stop valves, and particularly relates to a combined stop valve. BACKGROUND

[0002] A stop valve is a valve used to control fluid flow, which mainly adjusts the flow of fluid by changing the distance between the valve core and the valve seat, and its basic function is to cut off or allow fluid to pass through the pipeline. The design structure of the stop valve is usually good in sealing and flow regulation, and is suitable for occasions requiring accurate flow control. However, the combined stop valve is a valve that combines multiple functions together. It usually combines the basic functions of the stop valve, such as flow regulation and cutting off, and may also integrate other functions, such as filtering, non-return or pressure reduction. The main purpose is to realize multiple control functions in one valve, thereby reducing the equipment installation space, simplifying the system design and reducing the cost.

[0003] The existing stop valve structure design is relatively simple. Each time the fluid is transported, the flow pressure cannot be accurately adjusted, which directly controls the valve, increases the energy consumption, and also increases the wear of the valve parts. The existing stop valve only simply cuts off and blocks the fluid, and has poor flow regulation ability and low functionality, so it is less used. SUMMARY

[0004] The technical problem to be solved by the application is to overcome the shortcomings of the prior art and provide a combined stop valve.

[0005] The technical scheme adopted to solve the above technical problem is a combined stop valve, which comprises a valve body, a filter mechanism is installed at the bottom of the valve body, and a first valve cover is fixedly connected to the top center of the valve body.

[0006] A flow guide mechanism is installed on one side of the outer wall of the first valve cover, a sealing mechanism is installed in the center of the first valve cover, and a second valve cover is fixedly connected to the top center of the first valve cover.

[0007] An adjustment mechanism is installed in the center of the second valve cover.

[0008] Further, a first flange is fixedly connected to one side of the valve body, a second flange is fixedly connected to the other side of the valve body, and a ring seat is fixedly connected to the center of the inner part of the valve body.

[0009] Through the above technical scheme, when the device is used, the first flange and the second flange are respectively connected with the external pipeline, the fluid flows to the ring seat through the first flange, and then flows to the second flange, and the sealing effect is improved when the ring seat is in contact with the sealing mechanism.

[0010] Further, the filtering mechanism comprises a mounting sleeve fixedly connected to the bottom end of the outer wall of the valve body, a first internal thread is arranged on the outer end of the inner wall of the mounting sleeve, a filter cartridge is arranged in the mounting sleeve, a mounting head is fixedly connected to the outer end of the filter cartridge, an external thread is arranged on the outer wall of the outer end of the filter cartridge, and the filter cartridge is threadedly connected to the first internal thread on the mounting sleeve through the external thread.

[0011] Through the above technical scheme, when the fluid flows to the ring seat through the first flange, the fluid passes through the filter cartridge at this time, thereby effectively intercepting the solid impurities, particulate matters or sediments in the pipeline, preventing them from entering the valve body, reducing the risk of equipment wear, corrosion and blockage, and prolonging the service life of the equipment; meanwhile, the mounting head can be rotated in the later period, so that the filter cartridge is rotated in the mounting sleeve, the filter cartridge is taken down, the impurities in the filter cartridge are cleaned, repeated use is realized, and the filtering effect is improved.

[0012] Further, the flow guiding mechanism comprises a connecting frame fixedly connected to one side of the outer wall of the first valve cover, a partition plate is fixedly connected to the center of the inner wall of the guide valve, a through hole is arranged in the center of the partition plate, a first conduit is fixedly connected between the guide valve and the first flange, a second conduit is fixedly connected between the guide valve and the first valve cover, a first spring is fixedly connected to the center of the inner surface of the bottom end of the guide valve, a ball is fixedly connected to the top end of the first spring, a connecting rod is fixedly connected to the top of the ball, a movable plug is fixedly connected to the top end of the connecting rod, a flow guiding cavity is arranged in the movable plug, a second spring is fixedly connected to the top end of the movable plug, and a discharge hole is arranged on the outer wall of the guide valve.

[0013] Through the above technical scheme, when the device is in use, the small flow fluid in the first flange first flows to the guide valve through the first conduit, when the fluid pressure is lower than the overall pressure of the movable plug, the fluid enters the first valve cover through the second conduit and acts on the sealing mechanism, at this time, the sealing mechanism is in a sealed state, when the fluid pressure is greater than the overall pressure of the movable plug, the fluid pushes the movable plug at this time, thereby pushing the second spring, so that the flow guiding cavity is aligned with the discharge hole, so that the fluid in the first valve cover is discharged outward through the second conduit, the flow guiding cavity and the discharge hole, and at the same time, the connecting rod and the ball are both moved upward, so that the ball is attached to the through hole, sealing the partition plate, at this time, the fluid in the first flange extrudes the sealing mechanism, realizing the opening of the valve, the fluid flows to the second flange through the ring seat, and the fluid in the first valve cover is slowly discharged.

[0014] Further, the connecting rod penetrates the through hole, the movable plug is in sliding connection with the inner wall of the guide valve, and the top end of the second spring is fixedly connected to the inner surface of the top end of the guide valve.

[0015] Through the technical scheme, the pressure of the movable plug is set, only a small flow of fluid needs to be processed, precise regulation of large fluid is realized, energy consumption is relatively low, the device is less worn, has a long service life, and has low maintenance cost.

[0016] Further, the sealing mechanism comprises a sealing seat arranged at the top of the ring seat, a valve rod is fixedly connected to the center of the top of the sealing seat, a first connecting seat is fixedly connected to the top of the valve rod, a plurality of third springs are fixedly connected to the top of the first connecting seat, a second connecting seat is fixedly connected to the top of the plurality of third springs, a threaded rod is fixedly connected to the center of the top of the second connecting seat, two limiting holes are formed in the top of the first connecting seat and the second connecting seat, a first fixing sleeve is fixedly connected to the center of the inner surface of the bottom of the first valve cover, a threaded sleeve is rotatably connected in the first fixing sleeve, a first bevel gear is fixedly connected to the top end of the threaded sleeve, a second fixing sleeve is fixedly connected to the outer wall of the second valve cover, a first rotating rod is rotatably connected in the second fixing sleeve, a second bevel gear is fixedly connected to the inner end of the first rotating rod, and a first hand wheel is fixedly connected to the outer end of the first rotating rod.

[0017] Through the technical scheme, when the fluid pressure in the first flange increases, the sealing seat is pushed, the sealing seat extrudes the plurality of third springs through the valve rod and the first connecting seat, the entire sealing seat moves upward, valve opening is realized, the fluid in the first flange flows to the second flange through the ring seat, when the pressure of the sealing seat needs to be adjusted, the first hand wheel is rotated, the first rotating rod is driven to rotate, the second bevel gear is driven to rotate, the second bevel gear drives the first bevel gear to rotate, the threaded sleeve is driven to rotate, the threaded rod is driven to move downward due to the sliding connection between the second connecting seat and the adjusting vertical frame, the plurality of third springs are extruded, and greater pressure is required to open the sealing seat, the functionality is strong, the actual demand can be adjusted and used, and the whole is more flexible and can adapt to different operation requirements.

[0018] Further, the first connecting seat and the second connecting seat are in sliding connection with the inner wall of the first valve cover, the threaded rod is in threaded connection with the threaded sleeve, and the first bevel gear is in meshing connection with the second bevel gear.

[0019] Through the technical scheme, the small flow of fluid flows between the cavities of the first connecting seat and the second connecting seat through the first conduit, and acts on the sealing seat, so that the sealing seat cannot be opened at will, and the stability is improved.

[0020] Further, a second internal thread is formed in the inner wall of the second valve cover.

[0021] Through the technical scheme, the threaded seat rotates in the second internal thread.

[0022] Further, the adjusting mechanism comprises a threaded seat arranged in the second valve cover, a second rotating rod fixedly connected to the top end of the threaded seat, a second hand wheel fixedly connected to the top end of the second rotating rod, and an adjusting straight bracket rotatably connected to the bottom end of the threaded seat.

[0023] By the above technical scheme, when the fluid flow size of the ring seat needs to be adjusted, the second hand wheel is rotated to drive the second rotating rod to rotate, thereby driving the threaded seat to rotate, so that the threaded seat rotates in the second internal thread and moves downward, thereby driving the adjusting straight bracket to move downward and further driving the limiting seat to move downward. When the sealing seat moves upward to open, it touches the adjusted limiting seat, that is, the maximum flow of the fluid, which is functional, provides flexibility and accuracy of flow control, and is widely used in various industrial fields requiring flow adjustment.

[0024] Further, the threaded seat is threadedly connected with the second valve cover through the second internal thread, and the adjusting straight bracket penetrates through the plurality of limiting holes.

[0025] By the above technical scheme, when the entire valve needs to be completely closed, the limiting seat is adjusted to the bottom end to push the sealing seat to abut against the ring seat, so that sealing is achieved, fluid leakage is effectively prevented, and better safety, reliability and system control are provided.

[0026] The beneficial effects of the present application are as follows: (1) The present application can precisely adjust large fluid by only processing small flow fluid through the design of the flow guide mechanism, so that the energy consumption is relatively low, the device is less worn, the service life is longer, and the maintenance cost is lower; (2) The present application can effectively intercept solid impurities, particulate matter or deposits in the pipeline through the design of the filtering mechanism, prevent them from entering the valve body, reduce the risk of equipment wear, corrosion and blockage, and prolong the service life of the equipment; meanwhile, the filtering mechanism can be removed later to clean the impurities in the filter cartridge, realize reuse, and improve the filtering effect; (3) The present application can arbitrarily adjust the opening pressure of the sealing seat through the design of the sealing mechanism and the adjusting mechanism, which is functional, can be adjusted and used according to actual needs, can also adjust the flow size of the fluid, provides flexibility and accuracy of flow control, and is widely used in various industrial fields requiring flow adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the first perspective overall appearance view of the present application;

[0028] Figure 2 is the second perspective overall appearance view of the present application;

[0029] Figure 3 is the overall front view of the present application;

[0030] Figure 4 This is an overall sectional view of the present invention;

[0031] Figure 5 This is a schematic diagram of the filter mechanism structure of the present invention;

[0032] Figure 6 This is an exploded view of the sealing mechanism and adjusting mechanism of the present invention;

[0033] Figure 7 for Figure 4 A magnified view of a section at point A in the middle;

[0034] Figure 8 for Figure 4 A magnified view of a section at point B in the middle;

[0035] Figure 9 for Figure 4 A magnified view of a section at point C.

[0036] Reference numerals: 1. Valve body; 11. First flange; 12. Second flange; 13. Ring seat; 2. Filtering mechanism; 201. Mounting sleeve; 202. First internal thread; 203. Filter cylinder; 204. Mounting head; 205. External thread; 3. First valve cover; 4. Flow guiding mechanism; 401. Connecting frame; 402. Pilot valve; 403. Partition plate; 404. Through hole; 405. First guide tube; 406. Second guide tube; 407. First spring; 408. Ball; 409. Connecting rod; 410. Movable plug; 411. Flow guiding cavity; 412. Second spring; 413. Drain hole; 5. Sealing mechanism; 501. Sealing seat; 502. Valve stem; 503. First connecting seat; 504. Third spring; 505. Second connecting seat; 506. Threaded rod; 507. Limiting hole; 508. First fixing sleeve; 509. Threaded sleeve; 510. First bevel gear; 511. Second fixing sleeve; 512. First rotating rod; 513. Second bevel gear; 514. First handwheel; 6. Second valve cover; 61. Second internal thread; 7. Adjusting mechanism; 701. Threaded seat; 702. Second rotating rod; 703. Second handwheel; 704. Adjusting bracket; 705. Limiting seat. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] like Figures 1-9As shown, a combined shut-off valve of this embodiment includes a valve body 1. A first flange 11 is fixedly connected to one side of the valve body 1, and a second flange 12 is fixedly connected to the other side of the valve body 1. An annular seat 13 is fixedly connected to the center of the inside of the valve body 1. When in use, the device is connected to an external pipeline through the first flange 11 and the second flange 12 respectively. Fluid flows through the first flange 11 to the annular seat 13 and then to the second flange 12. At the same time, the sealing effect is improved when the annular seat 13 is in contact with the sealing mechanism 5. A first valve cover 3 is fixedly connected to the center of the top of the valve body 1, and a second valve cover 6 is fixedly connected to the center of the top of the first valve cover 3. A second internal thread 61 is provided on the inner wall of the second valve cover 6, so that the threaded seat 701 rotates in the internal thread of the second internal thread 61.

[0039] like Figures 1-5 As shown, a filter mechanism 2 is installed at the bottom of the valve body 1. The filter mechanism 2 includes a mounting sleeve 201 fixedly connected to the bottom of the outer wall of the valve body 1. The outer end of the inner wall of the mounting sleeve 201 is provided with a first internal thread 202. A filter cylinder 203 is provided inside the mounting sleeve 201. An mounting head 204 is fixedly connected to the outer end of the filter cylinder 203. The outer end of the outer wall of the filter cylinder 203 is provided with an external thread 205. The filter cylinder 203 is threadedly connected to the first internal thread 202 on the mounting sleeve 201 through the external thread 205. When the fluid flows from the first flange 11 to the ring seat 13, it passes through the filter cylinder 203, thereby effectively intercepting solid impurities, particles or sediments in the pipeline, preventing them from entering the valve body 1, reducing the risk of equipment wear, corrosion and blockage, and extending the service life of the equipment. At the same time, the mounting head 204 can be rotated later to rotate the filter cylinder 203 inside the mounting sleeve 201, remove it, clean the impurities inside the filter cylinder 203, realize reuse, and improve the filtration effect.

[0040] like Figures 1-7As shown, the outer wall side of the first valve cover 3 is provided with a flow guide mechanism 4, the flow guide mechanism 4 comprises a connecting frame 401 fixedly connected to the outer wall side of the first valve cover 3, the inner wall center of a guide valve 402 is fixedly connected with a partition plate 403, the center of the partition plate 403 is provided with a through hole 404, the guide valve 402 and the first flange 11 are fixedly connected with a first conduit 405, the guide valve 402 and the first valve cover 3 are fixedly connected with a second conduit 406, the bottom end inner surface center of the guide valve 402 is fixedly connected with a first spring 407, the top end of the first spring 407 is fixedly connected with a ball 408, the top of the ball 408 is fixedly connected with a connecting rod 409, the top end of the connecting rod 409 is fixedly connected with a movable plug 410, the movable plug 410 is provided with a flow guide cavity 411, the top end of the movable plug 410 is fixedly connected with a second spring 412, the outer wall of the guide valve 402 is provided with a discharge hole 413, when the device is in use, the small flow fluid in the first flange 11 flows to the guide valve 402 through the first conduit 405, when the fluid pressure is lower than the overall pressure of the movable plug 410, the fluid enters the first valve cover 3 through the second conduit 406 and acts on the sealing mechanism 5, at this time the sealing mechanism 5 is in a sealed state, when the fluid pressure is greater than the overall pressure of the movable plug 410, at this time the fluid pushes the movable plug 410, so as to push the second spring 412, so that the flow guide cavity 411 is aligned with the discharge hole 413, so that the fluid in the first valve cover 3 is discharged outward through the second conduit 406, the flow guide cavity 411 and the discharge hole 413, at the same time the connecting rod 409 and the ball 408 move upward, so that the ball 408 is attached to the through hole 404, realizing the sealing of the partition plate 403, at this time the fluid in the first flange 11 extrudes the sealing mechanism 5, realizing the opening of the valve, the fluid flows to the second flange 12 through the ring seat 13, and the fluid in the first valve cover 3 is slowly discharged, the connecting rod 409 penetrates the through hole 404, the movable plug 410 is slidingly connected with the inner wall of the guide valve 402, the top end of the second spring 412 is fixedly connected with the top end inner surface of the guide valve 402, by setting the pressure of the movable plug 410, only a small flow of fluid needs to be handled, realizing the accurate adjustment of large fluid, so that the energy consumption is relatively low, thereby causing the device to be less worn and the service life to be longer, the maintenance cost is lower.

[0041] As Figures 1-8As shown, the inner center of the first valve cover 3 is provided with a sealing mechanism 5, the sealing mechanism 5 comprises a sealing seat 501 arranged at the top of the ring seat 13, the top center of the sealing seat 501 is fixedly connected with a valve rod 502, the top of the valve rod 502 is fixedly connected with a first connecting seat 503, the top of the first connecting seat 503 is fixedly connected with a plurality of third springs 504, the top of the plurality of third springs 504 is fixedly connected with a second connecting seat 505, the top center of the second connecting seat 505 is fixedly connected with a threaded rod 506, the top of the first connecting seat 503 and the second connecting seat 505 is provided with two limiting holes 507, the bottom inner surface center of the first valve cover 3 is fixedly connected with a first fixed sleeve 508, the first fixed sleeve 508 is rotatably connected with a threaded sleeve 509, the top end of the threaded sleeve 509 is fixedly connected with a first bevel gear 510, the outer wall of the second valve cover 6 is fixedly connected with a second fixed sleeve 511, the second fixed sleeve 511 is rotatably connected with a first rotating rod 512, the inner end of the first rotating rod 512 is fixedly connected with a second bevel gear 513, the outer end of the first rotating rod 512 is fixedly connected with a first hand wheel 514, when the fluid pressure in the first flange 11 increases, the sealing seat 501 is pushed, so that the sealing seat 501 extrudes the plurality of third springs 504 through the valve rod 502 and the first connecting seat 503, so that the entire sealing seat 501 moves upward to realize the opening of the valve, the fluid in the first flange 11 flows to the second flange 12 through the ring seat 13, when it is needed to adjust the pressure of the sealing seat 501, the first hand wheel 514 is rotated to drive the first rotating rod 512 to rotate, thereby driving the second bevel gear 513 to rotate, so that the second bevel gear 513 drives the first bevel gear 510 to rotate, thereby driving the threaded sleeve 509 to rotate, since the second connecting seat 505 is slidingly connected with the adjusting vertical frame 704, the threaded rod 506 is driven to move downward to extrude the plurality of third springs 504, so that greater pressure is needed to open the sealing seat 501, the functionality is strong, and the actual demand can be adjusted and used, so that the whole is more flexible, different operation requirements can be adapted, the first connecting seat 503 and the second connecting seat 505 are slidingly connected with the inner wall of the first valve cover 3, the threaded rod 506 is threadedly connected with the threaded sleeve 509, the first bevel gear 510 is engaged with the second bevel gear 513, the small flow fluid flows between the cavities of the first connecting seat 503 and the second connecting seat 505 through the first conduit 405, and acts on the sealing seat 501, so that the sealing seat 501 will not be opened at will, and the stability is improved.

[0042] As Figures 1-9As shown, the inner center of the second valve cover 6 is provided with an adjusting mechanism 7, which comprises a threaded seat 701 arranged in the second valve cover 6, the top end of the threaded seat 701 is fixedly connected with a second rotating rod 702, the top end of the second rotating rod 702 is fixedly connected with a second hand wheel 703, the bottom end of the threaded seat 701 is rotatably connected with an adjusting straight frame 704, the bottom end of the adjusting straight frame 704 is fixedly connected with a limiting seat 705, when it is needed to adjust the fluid flow size of the ring seat 13, the second hand wheel 703 is rotated, so that the second hand wheel 703 drives the second rotating rod 702 to rotate, thereby driving the threaded seat 701 to rotate, so that the threaded seat 701 is screwed in the second internal thread 61 and moves downward, thereby driving the adjusting straight frame 704 to move downward, and further driving the limiting seat 705 to move downward, when the sealing seat 501 moves upward to open, the limiting seat 705 which has been adjusted is touched, that is, the maximum flow of the fluid, which has strong functionality, provides flexibility and accuracy of flow control, and is widely used in various industrial fields requiring flow adjustment, the threaded seat 701 is screwed with the second valve cover 6 through the second internal thread 61, the adjusting straight frame 704 penetrates through a plurality of limiting holes 507, when it is needed to completely close the entire valve, the limiting seat 705 is directly adjusted to the bottom end, thereby pushing the sealing seat 501 to abut against the ring seat 13, so as to realize sealing and effectively prevent fluid leakage, thereby providing better safety, reliability and system control.

[0043] The working principle of the embodiment is as follows: when the device is in use, the first flange 11 and the second flange 12 are respectively connected with external pipelines, fluid flows to the ring seat 13 through the first flange 11, when the fluid pressure is lower than the overall pressure of the movable plug 410, the fluid enters the cavity between the first connecting seat 503 and the second connecting seat 505 through the second conduit 406, and acts on the sealing seat 501, at this time the sealing mechanism 5 is in a sealing state;

[0044] When the fluid pressure is greater than the overall pressure of the movable plug 410, at this time the fluid pushes the movable plug 410, thereby pushing the second spring 412, so that the flow guide cavity 411 is aligned with the discharge hole 413, so that the fluid in the first valve cover 3 is discharged outward through the second conduit 406, the flow guide cavity 411 and the discharge hole 413, at the same time the connecting rod 409 and the ball 408 are both moved upward, so that the ball 408 abuts against the through hole 404, thereby sealing the partition plate 403, at this time the fluid in the first flange 11 passes through the filter cylinder 203, effectively intercepting solid impurities, particulate matter or deposits in the pipeline, and extruding the sealing seat 501, so that the sealing seat 501 extrudes a plurality of third springs 504 through the valve rod 502 and the first connecting seat 503, so that the entire sealing seat 501 moves upward to realize opening, and the fluid in the first flange 11 flows to the second flange 12 through the ring seat 13;

[0045] When the pressure of the sealing seat 501 needs to be adjusted, the first hand wheel 514 is rotated to drive the first rotating rod 512 to rotate, thereby driving the second bevel gear 513 to rotate, so that the second bevel gear 513 drives the first bevel gear 510 to rotate, thereby driving the threaded sleeve 509 to rotate. Since the second connecting seat 505 is in sliding connection with the adjusting straight bracket 704, the threaded rod 506 is driven to move downward, thereby pressing the plurality of third springs 504, so that a greater pressure is required to open the sealing seat 501, and the pressure adjustment of the sealing seat 501 is realized.

[0046] When the fluid flow size of the ring seat 13 needs to be adjusted, the second hand wheel 703 is rotated to drive the second rotating rod 702 to rotate, thereby driving the threaded seat 701 to rotate, so that the threaded seat 701 is screwed in the second inner thread 61 to move downward, thereby driving the adjusting straight bracket 704 to move downward, and further driving the limiting seat 705 to move downward. When the sealing seat 501 is moved upward to be opened, the limiting seat 705 that has been adjusted is touched, that is, the maximum flow of the fluid passing through is adjusted.

[0047] When the entire valve needs to be completely closed, the limiting seat 705 is directly adjusted to the bottom end, thereby pushing the sealing seat 501 to be attached to the ring seat 13, so that the sealing is realized, and the fluid leakage is prevented.

[0048] The above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application.

Claims

1. A combined shut-off valve, comprising a valve body (1), characterized in that: A filter mechanism (2) is installed at the bottom of the valve body (1), and a first valve cover (3) is fixedly connected to the top center of the valve body (1), and a second valve cover (6) is fixedly connected to the top center of the first valve cover (3). A flow guiding mechanism (4) is installed on one side of the outer wall of the first valve cover (3). The flow guiding mechanism (4) includes a connecting frame (401) fixedly connected to one side of the outer wall of the first valve cover (3). A partition (403) is fixedly connected to the center of the inner wall of the pilot valve (402). A through hole (404) is opened in the center of the partition (403). A first conduit (405) is fixedly connected between the pilot valve (402) and the first flange (11). A second conduit (406) is fixedly connected between the pilot valve (402) and the first valve cover (3). A first spring (407) is fixedly connected to the center of the inner surface of the bottom end of the valve (402). A ball (408) is fixedly connected to the top of the first spring (407). A connecting rod (409) is fixedly connected to the top of the ball (408). A movable plug (410) is fixedly connected to the top of the connecting rod (409). A flow guide cavity (411) is opened in the movable plug (410). A second spring (412) is fixedly connected to the top of the movable plug (410). A drain hole (413) is opened on the outer wall of the pilot valve (402). A sealing mechanism (5) is installed at the center of the inner part of the first valve cover (3). The sealing mechanism (5) includes a sealing seat (501) disposed on the top of the ring seat (13). A valve stem (502) is fixedly connected to the top center of the sealing seat (501). A first connecting seat (503) is fixedly connected to the top of the valve stem (502). A plurality of third springs (504) are fixedly connected to the top of the first connecting seat (503). A second connecting seat (505) is fixedly connected to the top of the plurality of third springs (504). A threaded rod (506) is fixedly connected to the top center of the second connecting seat (505). The first connecting seat (503) and the second connecting seat... Two limiting holes (507) are opened on the top of (505). A first fixing sleeve (508) is fixedly connected to the center of the bottom inner surface of the first valve cover (3). A threaded sleeve (509) is rotatably connected inside the first fixing sleeve (508). A first bevel gear (510) is fixedly connected to the top of the threaded sleeve (509). A second fixing sleeve (511) is fixedly connected to the outer wall of the second valve cover (6). A first rotating rod (512) is rotatably connected inside the second fixing sleeve (511). A second bevel gear (513) is fixedly connected to the inner end of the first rotating rod (512). A first handwheel (514) is fixedly connected to the outer end of the first rotating rod (512). An adjustment mechanism (7) is installed at the center of the interior of the second valve cover (6).

2. The combined shut-off valve according to claim 1, characterized in that, A first flange (11) is fixedly connected to one side of the valve body (1), a second flange (12) is fixedly connected to the other side of the valve body (1), and an annular seat (13) is fixedly connected to the center inside the valve body (1).

3. A combined shut-off valve according to claim 1, characterized in that, The filtering mechanism (2) includes a mounting sleeve (201) fixedly connected to the bottom of the outer wall of the valve body (1). The outer end of the inner wall of the mounting sleeve (201) is provided with a first internal thread (202). The mounting sleeve (201) is provided with a filter cylinder (203). The outer end of the filter cylinder (203) is fixedly connected with a mounting head (204). The outer end of the outer wall of the filter cylinder (203) is provided with an external thread (205). The filter cylinder (203) is threadedly connected to the first internal thread (202) on the mounting sleeve (201) through the external thread (205).

4. A combined shut-off valve according to claim 1, characterized in that, The connecting rod (409) passes through the through hole (404), the movable plug (410) is slidably connected to the inner wall of the pilot valve (402), and the top end of the second spring (412) is fixedly connected to the inner surface of the top end of the pilot valve (402).

5. A combined shut-off valve according to claim 1, characterized in that, The first connecting seat (503) and the second connecting seat (505) are both slidably connected to the inner wall of the first valve cover (3), the threaded rod (506) is threadedly connected to the threaded sleeve (509), and the first bevel gear (510) meshes with the second bevel gear (513).

6. A combined shut-off valve according to claim 1, characterized in that, The inner wall of the second valve cover (6) is provided with a second internal thread (61).

7. A combined shut-off valve according to claim 6, characterized in that, The adjusting mechanism (7) includes a threaded seat (701) disposed in the second valve cover (6), a second rotating rod (702) is fixedly connected to the top end of the threaded seat (701), a second handwheel (703) is fixedly connected to the top end of the second rotating rod (702), an adjusting straight frame (704) is rotatably connected to the bottom end of the threaded seat (701), and a limit seat (705) is fixedly connected to the bottom end of the adjusting straight frame (704).

8. A combined shut-off valve according to claim 7, characterized in that, The threaded seat (701) is threadedly connected to the second valve cover (6) via the second internal thread (61), and the adjusting straight bracket (704) passes through multiple limiting holes (507).

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