Large-caliber fluorine lining gate valve

Abstract

The utility model relates to the technical field of gate valves, in particular to a large-diameter fluorine-lined gate valve which comprises a gate valve body, a high platform is integrally formed at the top end of the middle of the gate valve body, a valve cover is arranged at the top end of the high platform, and a valve rod is movably connected in the valve cover and the high platform in a sleeved mode. A gate plate is arranged at the bottom end of the valve rod and located in the gate valve body. Preliminary positioning is achieved through matching of the positioning rod and the positioning groove, then fastening is conducted through the synergistic effect of the clamping block, the clamping block and the nut sleeve, the nut sleeve is connected to the threaded groove in the outer wall of the valve deck through the threads, when the nut sleeve is rotated, pressure can be evenly applied to the clamping block, and the valve deck is fixed. The clamping blocks are arranged on the first flange and the second flange, so that the clamping blocks uniformly act on the first flange and the second flange, the connection stress between the valve cover and the gate valve body is more uniform, the problem of loose connection or untight sealing caused by uneven local stress is avoided, and the tightness and stability of connection are effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a large-diameter fluorine-lined gate valve. Background Art

[0002] As key equipment for controlling the flow of fluids in various fields, including industrial production, fluid transportation, and municipal water supply and drainage, gate valves are crucial for their performance and reliability. Large-diameter fluorine-lined gate valves, due to their unique application scenarios and media characteristics, place higher demands on connection methods and sealing performance.

[0003] Existing large-diameter gate valves usually use multiple bolts to fix the valve cover and the gate valve body. During the manual tightening of the bolts, it is difficult to ensure that the tightening degree of each bolt is completely consistent due to factors such as the operator's strength, operating techniques, and operating sequence.

[0004] For example, in the pipeline systems of some large chemical companies, large-diameter gate valves have a large number of bolts. When operators manually tighten the bolts, it is difficult to accurately control the tightening torque of each bolt, resulting in some bolts being over-tightened and some bolts being under-tightened. Over-tightening may cause the bolts to deform or even break, affecting the reliability of the connection; under-tightening will make the connection between the valve cover and the gate valve body loose, which is prone to leakage and other problems. Utility Model Content

[0005] The purpose of the utility model is to provide a large-diameter fluorine-lined gate valve to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large-diameter fluorine-lined gate valve, comprising a gate valve body, a high platform integrally formed at the top of the middle part of the gate valve body, a valve cover arranged at the top of the high platform, a valve stem movably sleeved inside the valve cover and the high platform, a gate plate arranged at the bottom end of the valve stem and inside the gate valve body; a fixing mechanism is arranged between the high platform and the outer side of the valve cover, and a sealing mechanism is arranged between the high platform and the inner side of the valve cover.

[0007] Preferably, the fixing mechanism includes flange 1 and flange 2, flange 1 is fixedly connected to the top end of the platform, and flange 2 is fixedly connected to the bottom end of the valve cover, and a plurality of clamping grooves are provided with equal curvature on the outside of the opposite sides of flange 1 and flange 2, and a clamping block is clamped between the outer sides of the clamping grooves, a clamping block is fixedly installed on the top end of the clamping block, and a clamping groove matching the clamping block is provided with equal curvature on the outer wall of the valve cover.

[0008] Preferably, the fixing mechanism further includes a thread groove, which is arranged on the outer wall of the valve cover, and the outside of the valve cover is threadedly connected to a nut sleeve through the thread groove, and a plurality of drive blocks are arranged at equal arcs on the outer wall of the nut sleeve.

[0009] Preferably, a plurality of positioning rods are provided at equal arcs on the outer ring of the upper end of the flange 1, and a positioning groove matching the positioning rods is provided on the outer ring of the flange 2.

[0010] Preferably, the sealing mechanism includes a sealing groove, which is annularly arranged in the middle of the flange 1 and the flange 2, and a sealing ring is arranged between the sealing grooves.

[0011] Preferably, a lining is provided on the inner wall of the gate valve body, and the material of the lining is polytetrafluoroethylene.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This large-diameter fluorine-lined gate valve realizes preliminary positioning through the cooperation of the positioning rod and the positioning groove, and then uses the coordinated action of the clamping block, the card block and the nut sleeve to tighten. The nut sleeve is connected to the thread groove on the outer wall of the valve cover through a thread. When the nut sleeve is rotated, it can evenly apply pressure to the card block, thereby making the clamping block evenly act on flange 1 and flange 2, making the connection between the valve cover and the gate valve body more evenly stressed, avoiding the problem of loose connection or poor sealing due to uneven local stress, and effectively ensuring 1. The tightness and stability of the connection; 2. This large-diameter fluorine-lined gate valve, in the pipeline system for conveying fluid media, the tightness of the connection is directly related to the sealing performance of the gate valve. Since the fixing mechanism of the gate valve can ensure the tight connection between the valve cover and the gate valve body, the sealing ring in the sealing mechanism can play a better role. After being evenly squeezed, the sealing ring can more effectively fill the gap between flange one and flange two to prevent the medium from leaking from the connection, thereby improving the sealing reliability of the gate valve. It is especially suitable for pipeline systems that convey high-pressure, toxic, flammable and explosive and other special media. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall main structure of the utility model.

[0014] Figure 2 This is a schematic diagram of the valve cover installation structure of the present utility model.

[0015] Figure 3 This is a schematic diagram of the sealing ring installation structure of the present utility model.

[0016] Figure 4 For the utility model Figure 1 Enlarged schematic diagram of point A in the middle.

[0017] In the figure: 1. Gate valve body; 2. Platform; 3. Valve cover; 4. Valve stem; 5. Gate disc; 6. Flange 1; 7. Flange 2; 8. Clamping groove; 9. Clamping block; 10. Clamping block; 11. Clamping groove; 12. Threaded groove; 13. Nut sleeve; 14. Drive block; 15. Positioning rod; 16. Positioning groove; 17. Sealing groove; 18. Sealing ring; 19. Lining. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figure 1-4 As shown, the utility model provides a technical solution: a large-diameter fluorine-lined gate valve, including a gate valve body 1, an inner lining 19 is provided on the inner wall of the gate valve body 1, the material of the lining 19 is polytetrafluoroethylene, a high platform 2 is integrally formed at the top of the middle part of the gate valve body 1, a valve cover 3 is provided at the top of the high platform 2, a valve stem 4 is movably sleeved inside the valve cover 3 and the high platform 2, a gate plate 5 is provided at the bottom end of the valve stem 4 and inside the gate valve body 1; a fixing mechanism is provided between the high platform 2 and the outer side of the valve cover 3, the fixing mechanism includes a flange 1 6 and a flange 2 7, the flange 1 6 is fixedly connected to the top of the high platform 2, the flange 2 7 is fixedly connected to the bottom end of the valve cover 3, and the flange 1 6 is fixedly connected to the flange 2. A number of clamping grooves 8 are provided on the outside of the opposite side of flange 2 7 with equal curvature, a clamping block 9 is clamped between the outer sides of the clamping grooves 8, a clamping block 10 is fixedly installed on the top of the clamping block 9, and a clamping groove 11 matching the clamping block 10 is provided on the outer wall of the valve cover 3 with equal curvature, the fixing mechanism also includes a threaded groove 12, a threaded groove 12 is provided on the outer wall of the valve cover 3, and a nut sleeve 13 is threadedly connected to the outside of the valve cover 3 through the threaded groove 12, and a number of driving blocks 14 are provided on the outer wall of the nut sleeve 13 with equal curvature, a number of positioning rods 15 are provided with equal curvature on the outer ring of the upper end of flange 1 6, and a positioning groove 16 matching the positioning rod 15 is provided on the outer ring of flange 2 7.

[0020] In this embodiment, preliminary positioning is achieved by the cooperation of the positioning rod 15 and the positioning groove 16, and then tightening is performed by the coordinated action of the clamping block 9, the block 10 and the nut sleeve 13. The nut sleeve 13 is connected to the threaded groove 12 on the outer wall of the valve cover 3 by a thread. When the nut sleeve 13 is rotated, it can evenly apply pressure to the block 10, thereby making the clamping block 9 evenly act on flange 1 6 and flange 2 7, so that the connection between the valve cover 3 and the gate valve body 1 is more evenly stressed, avoiding the problem of loose connection or poor sealing due to local uneven stress, and effectively ensuring the tightness and stability of the connection.

[0021] like Figure 3 As shown, a sealing mechanism is provided between the platform 2 and the inner side of the valve cover 3 , and the sealing mechanism includes a sealing groove 17 . The sealing groove 17 is provided in an annular shape in the middle of the flange 1 6 and the flange 2 7 , and a sealing ring 18 is provided between the sealing grooves 17 .

[0022] In this embodiment, in the pipeline system for conveying fluid media, the tightness of the connection is directly related to the sealing performance of the gate valve. Since the fixing mechanism of the gate valve can ensure the tight connection between the valve cover 3 and the gate valve body 1, the sealing ring 18 in the sealing mechanism can play a better role. After being uniformly squeezed, the sealing ring 18 can more effectively fill the gap between flange 1 6 and flange 2 7 to prevent the medium from leaking from the connection, thereby improving the sealing reliability of the gate valve. It is particularly suitable for pipeline systems that convey special media such as high-pressure, toxic, flammable and explosive media.

[0023] Working principle: When it is necessary to cut off the flow of the medium in the pipeline, the valve stem 4 is rotated by an external driving device. The valve stem 4 moves downward along the axial direction under the structure of the sleek socket inside the valve cover 3 and the platform 2. The gate plate 5 at the bottom end of the valve stem 4 then drops until the gate plate 5 fits tightly against the inner wall of the channel of the gate valve body 1, thereby blocking the flow of the medium. Since the lining 19 is made of polytetrafluoroethylene, it has good corrosion resistance and sealing properties, which can further prevent the medium from leaking from the gap between the gate plate 5 and the inner wall of the channel. When it is necessary to allow the medium to flow, the valve stem 4 is rotated in the opposite direction by an external driving device, and the valve stem 4 moves upward along the axial direction, driving the gate plate 5 to rise. The gate plate 5 gradually leaves the inner wall of the channel of the gate valve body 1, allowing the medium to flow normally in the pipeline. When installing the valve cover 3, align flange 2 7 with flange 1 6 at the top of the platform 2, insert the positioning rod 15 into the positioning groove 16 to achieve preliminary positioning, ensure that the relative positions of flange 1 6 and flange 2 7 are accurate, and insert the clamping block 9 into the clamping groove 8 on the outside of the side opposite to flange 1 6 and flange 2 7, and push horizontally to align the clamping block 10 with the clamping groove 11 on the outer wall of the valve cover 3 and clamp it in, limiting the relative position of flange 1 6 and flange 2 7 to prevent lateral displacement or loosening, rotate the nut sleeve 13 to make it move downward along the threaded groove 12 on the outer wall of the valve cover 3, and after the nut sleeve 13 moves downward, it abuts against the outside of the clamping block 10 and the clamping groove 11. Through the abutment, the nut sleeve 13 applies pressure to the clamping block 10, thereby making the clamping block 9 more tightly clamped in the clamping groove 8, further enhancing the connection tightness between flange 1 6 and flange 2 7, and achieving a stable connection between the valve cover 3 and the gate valve body 1. When flange 1 6 and flange 2 7 are tightly connected through the fixing mechanism, the sealing ring 18 arranged in the annular sealing groove 17 in the middle of the two is squeezed, and the sealing ring 18 undergoes elastic deformation, filling the small gap between flange 1 6 and flange 2 7 to form a sealing barrier, effectively preventing the medium from leaking from the connection between the valve cover 3 and the gate valve body 1, thereby ensuring the sealing performance of the gate valve.

[0024] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements 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 large-diameter fluorine-lined gate valve, characterized by: include A gate valve body (1), wherein a platform (2) is integrally formed at the top of the middle portion of the gate valve body (1), a valve cover (3) is provided at the top of the platform (2), a valve stem (4) is movably sleeved inside the valve cover (3) and the platform (2), and a gate plate (5) is provided at the bottom end of the valve stem (4) and inside the gate valve body (1); A fixing mechanism is provided between the platform (2) and the outer side of the valve cover (3), and a sealing mechanism is provided between the platform (2) and the inner side of the valve cover (3); The fixing mechanism includes flange 1 (6) and flange 2 (7), flange 1 (6) is fixedly connected to the top end of the platform (2), and flange 2 (7) is fixedly connected to the bottom end of the valve cover (3), a plurality of clamping grooves (8) are provided on the outside of the flange 1 (6) and flange 2 (7) at equal arcs, a clamping block (9) is clamped between the outer sides of the clamping grooves (8), a clamping block (10) is fixedly installed on the top end of the clamping block (9), and a clamping groove (11) matching the clamping block (10) is provided on the outer wall of the valve cover (3) at equal arcs; The fixing mechanism further comprises a thread groove (12), the thread groove (12) being provided on the outer wall of the valve cover (3), the outer portion of the valve cover (3) being threadedly connected to a nut sleeve (13) via the thread groove (12), and a plurality of driving blocks (14) being provided at equal arcs on the outer wall of the nut sleeve (13); A plurality of positioning rods (15) are provided at equal arcs on the outer ring of the upper end of the flange 1 (6), and a positioning groove (16) matching the positioning rods (15) is provided on the outer ring of the flange 2 (7); The sealing mechanism includes a sealing groove (17), the sealing groove (17) is provided in an annular shape in the middle of the flange 1 (6) and the flange 2 (7), and a sealing ring (18) is provided between the sealing grooves (17); An inner lining (19) is provided on the inner wall of the gate valve body (1), and the material of the inner lining (19) is polytetrafluoroethylene.

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