Operation control assembly for rapidly opening and closing gate valve and related sealing element thereof

Abstract

The invention discloses an operation control assembly of a rapid opening and closing gate valve and a related sealing piece. The operation control assembly comprises a hand wheel, a valve rod nut, a cylindrical pin, an upper tooth piece, a lower tooth piece, a spring, a round nut, a limiting piece, a packing gland, a first valve rod, a second valve rod, a support, a flow guide pipe, a valve deck, a bolt and a fixing sleeve. The sealing piece comprises a first valve body, a second valve body, a third valve body, a first flange, a second flange, a tubular gate plate, a bell-shaped gate plate, a sealing body, a spherical gate plate, a reducing valve seat, a sealing ring, a valve seat, a pressing ring and a bottom nut. Opening and closing of the tubular gate plate, the bell-shaped gate plate and the spherical gate plate in a cavity a of the first valve body or a cavity b of the second valve body or a cavity c of the third valve body are achieved in the mode that an operating hand wheel drives a valve rod nut, then a first valve rod or a second valve rod is driven, the rotating position is limited by a limiting piece, and an upper tooth piece and a lower tooth piece are supported by a spring. The rotation and lifting movement is realized; in the full-open state, the medium circulates; in the fully-closed state, the medium is cut off.

Description

[0001] The present invention relates to a compact forged valve, and more particularly to an operating control assembly for a quick-opening and closing gate valve and its related seals. Background Art

[0002] Traditional general-purpose gate valves such as Figure 22 (cast steel valves above DN50mm), as a control component widely used in industrial pipeline systems, mainly function to open and close the flow of liquid media and cut off, achieving reliable isolation of substances in the pipeline. Its opening and closing member is a gate plate, and the movement direction of the gate plate is perpendicular to the fluid direction. It can only be fully opened and fully closed, and cannot be adjusted and throttled. When the gate plate is lifted to the fully open position, the fluid passage is completely unobstructed; when the gate plate is lowered to the fully closed position, the fluid is completely blocked.

[0003] Forged steel gate valves (such as those below DN100mm) in relatively large quantities in medium and small pipeline systems such as Figure 23 , generally adopt a reduced-diameter flow path design, which can accelerate the fluid velocity in the pipeline, thereby increasing the flow rate and conveying capacity of the pipeline. For medium and small-diameter valves, this is particularly important because they require precise flow control in many applications. The reduced diameter can improve the fluid flow state to a certain extent, reduce energy loss during the flow process, and improve system efficiency. In addition, the reduced-diameter design can reduce the materials required for valve manufacturing, thereby reducing production costs to a certain extent.

[0004] Gate valves have a long application history, but there are still some deficiencies in technology. Because their outer dimensions and opening height are relatively large, a large installation space is required, which causes inconvenience or restricts their application in some space-limited occasions. Since the gate plate needs to be fully raised or lowered to achieve full open or full closed, it affects the response speed and efficiency of the system. During the opening and closing process, there will be relative friction between the sealing surfaces of the gate valve, which leads to wear and abrasion of the sealing surfaces. After long-term use, it will affect the sealing performance and service life of the valve. At the same time, the structure of the gate valve is relatively complex, especially the sealing surface on the gate seat is not easy to machine. In addition, the gate valve usually has two sealing pairs, which increases the difficulty and cost of processing, grinding and maintenance. Due to the complex structure, difficult processing and many parts of the gate valve, its price is usually relatively high, increasing the cost of the system. Moreover, the gate valve can only be used for full open or full closed control. Although the flow rate of the medium can be controlled to a certain extent by adjusting the rotation angle of the valve stem, being in a semi-open state for a long time will exacerbate the wear of the gate plate and the valve seat. Therefore, it is not suitable to be used as a throttle valve.

[0005] It also involves that the currently adopted forged steel gate valves need to cut off the entity through mechanical cutting to form a space for placing seals inside, which has problems of large material consumption, complex processing technology and too high cost. For small and medium-sized valves that are ideally obtained (such as DN50-100mm forged steel gate valves) to accelerate the fluid velocity in the pipeline, improve the flow rate and conveying capacity of the pipeline, due to the high investment in hot forging machinery and its production molds and the high price of finished products, it is difficult to sell, and this limit has not been broken through yet, and it is only limited to below DN50mm. To reduce the equipment weight and prevent the valve from leaking and causing adverse environmental pollution, most forged steel gate valves adopt the method of inserting the pipe into the inlet and outlet ends of the valve and welding it to the pipeline to solve such prominent problems. The nature of the valve basically belongs to the characteristics of one-time installation and use without maintenance.

[0006] The valve body of the gate valve is a pressure-bearing component similar to a pressure vessel. For a long time, it has been able to meet the vast majority of market demands by means of casting with low process cost in terms of cost performance. Due to the expensive purchase price, only a very small number of forged valves, such as for ultra-supercritical in thermal power plants including the nuclear power industry, are used to meet the harsh working conditions of 630°C / 38.48MPaG. The chemical composition, grain size, and metallographic structure therein need to meet certain standards. Generally, the grain size is required to be ≥5 levels to improve high-temperature strength and creep resistance performance, etc., to ensure structural integrity and long-term reliability, while castings are only used in non-critical devices or low-parameter scenarios.

[0007] In addition, it cannot be ignored that valve castings, due to the need for multiple model chemical forming and steel hot processing procedures (especially precision casting), especially have a greater impact on environmental pollution and the labor intensity of workers, and on the other hand, there is the trouble that it is difficult to control the castings to reach a unified quality standard due to the complicated procedures. Summary of the Invention

[0008] In view of the deficiencies of the existing valve technology, the present invention is proposed.

[0009] By reconstructing the valve body, sealing pair structure and their corresponding movement and control components of the gate valve, the purpose of realizing energy conservation and obtaining low-cost manufacturing while improving product quality is achieved.

[0010] An operation control component of a quick-opening and closing gate valve and its related seals, characterized in that: the operation control component includes: handwheel 9, valve stem nut 7, cylindrical pin 6, upper tooth piece 10, lower tooth piece 11, spring 5, round nut 12, limit piece 4, packing gland 3, first valve stem 8, second valve stem 26, bracket 21, guide pipe 22, valve cover 23, bolt 30, fixed sleeve 31.

[0011] The related seals include: the first valve body 1, the second valve body 17, the third valve body 24, the first flange 20, the second flange 29, the tubular gate 2, the bell-shaped gate 18, the sealing layer 19, the spherical gate 27, the reducing valve seat 25, the sealing ring 13, the valve seat 14, the gland ring 16, and the bottom nut 15.

[0012] The first valve body 1 is a casting. The stuffing box 1-5 formed at the upper part of the large diameter a1-4, the connected annular body 1-6 and the bow-shaped frame 1-7 are an integral structure. It internally includes an inlet a1-1, an outlet a1-2, and a chamber a1-3 that extends vertically between the inlet a1-1 and the outlet a1-2. Conical sealing surfaces a1-8 and conical surfaces 1-9 are formed on both sides inside the chamber a1-3.

[0013] The second valve body 17 is a four-way formed by pressing a pipe fitting, including an inlet b17-1, an outlet b17-2, a chamber b17-3 that extends upward between the inlet b17-1 and the outlet b17-2, and a thread b17-4.

[0014] The interior of the second valve body 17 includes a sliding valve seat 28 arranged to cooperate with the spherical gate 27 for sealing and a fixed sleeve 31 that restricts the position of the spherical gate 27.

[0015] The third valve body 24 is a three-way formed by pressing a pipe fitting, including an inlet c24-1, an outlet c24-2, a chamber c24-3 that extends vertically between the inlet c24-1 and the outlet c24-2, and reducing valve seats 25 are formed inside the inlet c24-1 and the outlet c24-2 on both sides of the chamber 24-3c.

[0016] The rotation and lifting movements of the tubular gate 2, the bell-shaped gate 18, and the spherical gate 27 in the chamber a1-3 of the first valve body 1, or the chamber b17-3 of the second valve body 17, or the chamber c24-3 of the third valve body 24 are realized by operating the handwheel 9 to drive the valve stem nut 7, which in turn drives the upper tooth piece 10, which in turn drives the lower tooth piece 11, which in turn drives the first valve stem 8 or the second valve stem 26; the limit piece 4 and the stuffing gland 3 limit the rotation angle of the first valve stem 8 or the second valve stem 26; the spring 5 supports the upper tooth piece 10 and the lower tooth piece 11 and provides a meshing force.

[0017] The process of the valve from fully open to fully closed is as follows: First, the valve is in the fully open state. The tubular gate channel f2-4 of the tubular gate 2 is aligned with the inlet a1-1 and the outlet a1-2 of the first valve body 1, and the sealing surface f2-3 is in a disengaged state from the conical sealing surface a1-8 in the first valve body 1 or the conical sealing surface d14-1 of the valve seat 14. Or, the bell-shaped gate passage 18-3 of the bell-shaped gate 18 is aligned with the inlet b17-1 and the outlet b17-2 of the second valve body 17, and the sealing surface g19-1 of the sealing body 19 in cooperation is either in contact with the sealing surface h20-2 of the first flange 20 in the second valve body 17 or in a disengaged state; Or, the tubular gate passage 2-4 of the tubular gate 2 is aligned with the inlet c24-1 and the outlet c24-2 of the third valve body 24, and the sealing surface f2-3 is in a disengaged state from the sealing surface i25-4 of the reducing valve seat 25 in the third valve body 24; Or, the spherical gate passage 27-2 of the spherical gate 27 is aligned with the inlet b17-1 and the outlet b17-2 of the second valve body 17, and the wedge-shaped sealing surface 28-3 of the sliding valve seat 28 is in a disengaged state from the sealing surface j29-2 in the second flange 29; Rotate the handwheel 9 clockwise, Drive the valve stem nut 7, and then drive the upper tooth piece 10, then drive the lower tooth piece 11, then drive the first valve stem 8, and then drive the tubular gate 2 to rotate. When rotating 90°, the edge d4-1 of the limit piece 4 contacts the edge a3-3 of the convex part a3-2 of the stuffing box gland 3, restricting the first valve stem 8 from continuing to rotate, and at the same time restricting the rotation of the lower tooth piece 11. Continue to rotate the handwheel 9 clockwise, Drive the valve stem nut 7. Since the rotation movement of the lower tooth piece 11 is restricted, the upper tooth piece teeth 10-3 of the upper tooth piece 10 will exceed the lower tooth piece teeth 11-3 of the lower tooth piece 11, thereby driving the first valve stem 8 to make a linear upward movement, and then driving the tubular gate 2 to make a linear upward movement until, The sealing surface f2-3 of the tubular gate 2 contacts the conical sealing surface a1-8 on the first valve body 1 or the conical sealing surface d14-1 of the valve seat 14 to present a sealed state. At this time, the tubular gate passage 2-4 is perpendicular to the inlet a1-1 and the outlet a1-2; Or, the sealing surface g19-1 of the sealing body 19 in cooperation with the bell-shaped gate 18 contacts the sealing surface h20-2 of the first flange 20 in the second valve body 17 to present a sealed state. At this time, the bell-shaped gate flow channel 18-3 is perpendicular to the inlet b17-1 and the outlet b17-2; Or, the sealing surface f2-3 of the tubular gate 2 contacts the sealing surface i25-4 of the reducing valve seat 25 in the third valve body 24 to present a sealed state. At this time, the tubular gate flow channel 2-4 is perpendicular to the inlet c24-1 and the outlet c24-2; Or, the wedge-shaped sealing surface 28-3 of the sliding valve seat 28 contacts the sealing surface j29-2 in the second flange 29 to present a sealed state. At this time, the spherical gate flow channel 27-2 is perpendicular to the inlet b17-1 and the outlet b17-2; Finally, the valve changes from the fully open state to the fully closed state.

[0018] The process of the valve from fully closed to fully open is as follows: First, the valve is in the fully closed state. Rotate the handwheel 9 counterclockwise. Drive the valve stem nut 7. At this time, since the sealing force of the tapered sealing surfaces a1-8 on the tubular gate 2 and the valve body 1 or the tapered sealing surface d14-1 of the valve seat 14 in close contact is greater than the meshing force of the spring 5 acting on the lower tooth piece 10 against the upper tooth piece 11, the upper tooth piece teeth 10-3 of the upper tooth piece 10 driven by the valve stem nut 7 will exceed the lower tooth piece teeth 11-3 of several lower tooth pieces 11, thereby driving the first valve stem 8 to move linearly downward, and further driving the tubular gate 2 to move linearly downward until the sealing force between the tubular gate 2 and the tapered sealing surface a1-8 on the first valve body 1 or the tapered sealing surface d14-1 of the valve seat 14 is removed. Finally, The sealing surface f2-3 of the tubular gate 2 is disengaged from the tapered sealing surface a1-8 on the first valve body 1 or the tapered sealing surface d14-1 of the valve seat 14; Or the sealing surface g19-1 of the sealing body 19 cooperating with the bell-shaped gate 18 is disengaged from the sealing surface h20-2 of the first flange 20 in the second valve body 17; Or the sealing surface f2-3 of the tubular gate 2 is disengaged from the sealing surface i25-4 of the reducing valve seat 25 in the third valve body 24; Or the wedge-shaped sealing surface 28-3 of the sliding valve seat 28 is disengaged from the sealing surface j29-2 in the second flange 29; At this time, the sealing force has been removed. The spring 5 acts on the lower tooth piece 11, and the meshing force against the upper tooth piece 10 is greater than the resultant force of the friction between the first valve stem 8 and the packing and the gravity of the tubular gate 2. The upper tooth piece 10 and the lower tooth piece 11 return to the meshing state again; Continue to rotate the handwheel 9 counterclockwise. Drive the valve stem nut 7, and then drive the first valve stem 8, and then the limit piece 4 rotates 90° until the edge e4-2 of the limit piece 4 contacts the edge h3-7 of the convex part b3-5 of the packing gland 3. The tubular gate passage 2-4 of the tubular gate 2 is aligned with the inlet a1-1 and the outlet a1-2 of the first valve body 1, and the valve opens; Or the bell-shaped gate passage 18-3 of the bell-shaped gate 18 is aligned with the inlet b17-1 and the outlet b17-2 of the second valve body 17, and the valve opens; Or the tubular gate passage 2-4 of the tubular gate 2 is aligned with the inlet c24-1 and the outlet c24-2 of the third valve body 24, and the valve opens; Or the spherical gate passage 27-2 of the spherical gate 27 is aligned with the inlet b17-1 and the outlet b17-2 of the second valve body 17, and the valve opens; Finally, the valve changes from the fully closed state to the fully open state.

[0019] The inner diameter a (4-5) of the limit piece (4) and the inner diameter c (11-1) of the lower toothed piece (11) extend inwards on both sides of the center to form two limit piece keys (4-6) and lower toothed piece keys (11-2) with mirror features, and can penetrate into the keyway a (8-2) of the first valve stem (8) to form a sliding fit. Involute upper toothed piece teeth (10-3) and lower toothed piece teeth (11-3) are arranged on the plane below the upper toothed piece (10) and the plane above the lower toothed piece (11). The tooth surface on the circumferential circle of the upper toothed piece (10) includes two symmetric pin holes b (10-2) in the inward direction.

[0020] Symmetric pin holes p7-2 are provided on the end face p7-1 of the outer diameter circumference of the valve stem nut 7; symmetric pin holes b10-2 are provided on the upper toothed piece 10; the symmetric pin holes p7-2 and the symmetric pin holes b10-2 have the same size and the same center distance.

[0021] The upper end face a5-1 of the spring 5 contacts the plane c11-4 of the lower toothed piece 11, and the lower end face a5-2 contacts the end face q12-1 of the round nut 12.

[0022] The outer diameter direction of the pressing ring 16 is set as a conical surface c16-1; the end of the conical surface c16-1 is set as a small diameter c16-2; the middle part is set as a closed round table 16-3 downward; a thread c16-4 is provided in the round table 16-3; the middle part is set as a convex part c16-5 upward.

[0023] The stuffing box gland 3 has centrally symmetric convex parts a3-2 and convex parts b3-5 on the end face n3-1.

[0024] At least two or more concentric spherical grooves 28-2 are provided in the direction of the spherical sealing surface 28-1 on the inner side of the sliding valve seat 28, and at least two or more concentric planar grooves 28-4 are provided in the direction of the wedge-shaped sealing surface 28-3.

[0025] The upper part connected to the spherical surface (27-3) of the spherical gate plate (27) is a cylindrical outer circle (27-4), and a T-shaped groove (27-1) for movable cooperation with the second valve stem (26) is provided inside.

[0026] The fixed sleeve (31) is provided with a large-diameter inner hole (31-1) and a small-diameter inner hole (31-2). Among them, the large-diameter inner hole (31-1) forms a fixed interlock with the upper cylindrical exterior (27-4) of the spherical gate plate (27), and the small-diameter inner hole (31-2) is loosely sleeved on the second valve stem (26) with a relatively large gap. Beneficial effects

[0027] The valve can open and close the gate valve by operating the rotary motion component and the seal at 90°, and then through a very short upward and downward stroke. It further optimizes the structure of the valve body and the gate plate and the lightweight design. Combined with a low-inertia drive mechanism (such as an electric, pneumatic or hydraulic actuator), it can complete the fully open or fully closed action within 3 to 5 seconds, and the response speed is increased by more than 90% compared with the traditional gate valve. Its fast cut-off characteristic can effectively cope with sudden working conditions such as sudden increase in pipeline pressure and medium leakage. In the petrochemical, energy and other fields, the accident disposal time window can be shortened to 1 / 3 of the original standard, significantly reducing the safety risk.

[0028] This technology breaks through the performance bottleneck of traditional gate valves, forms significant advantages in terms of safety, energy efficiency ratio and environmental adaptability, and provides key technical support for the intelligent upgrading of the process industry.

[0029] Due to its simple structure, high manufacturing precision, good sealing performance and durability, it can maintain stable performance for a long time. When the valve plate opens, it can immediately disengage from the sealing surface of the valve body, resulting in less friction and wear. The switching torque is lower than that of ordinary gate valves, and a pneumatic device with lower cost can be used to replace the expensive multi-turn valve electric device that is generally used for existing gate valves to control the valve.

[0030] The valve plate is a straight-through design with a diversion hole. When the valve opens, the connection mode with the medium channel of the valve body is similar to a straight-through pipeline. When the medium flows through, its flow direction will not change. Therefore, the fluid resistance is small, and the energy consumption required for transporting the fluid is low, which helps to reduce the operating cost of the system.

[0031] It can be applied to a variety of media, including gases, liquids, etc., and can meet the usage requirements under different working conditions. It can be used in occasions for distributing media and changing the flow direction of media, such as three-way valves and four-way valves. Description of the Drawings

[0033] Figure 1 It is a cross-sectional view of the first example of the operation control component of a fast-opening and closing gate valve of the present invention and its related seal, in the form of an assembly of the first valve body (cast integrally).

[0034] Figure 2 is Figure 1 A perspective view showing the cast integrally formed valve body.

[0035] Figure 3 is Figure 1 A perspective view showing the tubular gate plate and the valve stem.

[0036] Figure 4 is Figure 1 An enlarged view of the upper structure cross-sectional view.

[0037] Figure 5 is Figure 1 An enlarged view of the bottom structure cross-sectional view.

[0038] Figure 6 is Figure 1 It is a top view of the movement relationship between the stuffing box gland 3 and the limit block 4.

[0039] Figure 7 is Figure 1 It is a sectional view showing the valve seat 14.

[0040] Figure 8 It is a position diagram of the stuffing box gland and the limit block of the gate valve of the present invention in the closed state.

[0041] Figure 9 It is a position diagram of the stuffing box gland and the limit block of the gate valve of the present invention in the open state.

[0042] Figure 10 is Figure 1 It is a perspective view showing the upper part of the cast integrally formed valve body and the connecting assembly.

[0043] Figure 11 It is a perspective view of the upper tooth piece.

[0044] Figure 12 It is a perspective view of the lower tooth piece.

[0045] Figure 13 It is a sectional view of the assembly of the second valve body (forged split type) of the operation control assembly and its related seals of a quick-opening and closing gate valve of the present invention.

[0046] Figure 14 It is a perspective view of the second valve body (forged split type) of the second example.

[0047] Figure 15 is Figure 13 It is a perspective view showing the assembly of the bell-shaped gate plate and the seal body.

[0048] Figure 16 is Figure 15 It is a perspective view showing the bell-shaped gate plate in the assembly.

[0049] Figure 17 is Figure 15 It is a perspective view showing the seal body.

[0050] Figure 18 It is a sectional view of the assembly of the third valve body (forged split type) of the operation control assembly and its related seals of a quick-opening and closing gate valve of the present invention.

[0051] Figure 19 is Figure 18 It is a sectional view of the reduced-diameter valve seat forming the intermediate member of the third valve body (forged split type) of the third example.

[0052] Figure 20It is the sectional view of the 4th example of the operation control component of a quick-opening and closing gate valve of the present invention and its related seals, in the form of the third valve body (cast split type) and the spherical gate plate assembly.

[0053] Figure 21 Show Figure 20 The enlarged sectional view at the spherical gate plate sealing surface.

[0054] Figure 22 It is the sectional view of a commercially available gate valve (cast).

[0055] Figure 23 It is the sectional view of a commercially available compact gate valve (forged).

[0056] The reference numbers in the figure are: 1. First valve body, 1-1. Inlet a, 1-2. Outlet a, 1-3. Chamber a, 1-4. Large diameter a, 1-5. Stuffing box, 1-6. Annular body, 1-7. Bow-shaped frame, 1-8. Conical sealing surface a, 1-9. Conical surface, 1-10. Internal thread a, 2. Tubular gate plate, 2-1. Flow-through end solid, 2-2. Sealing end solid, 2-3. Sealing surface f, 2-4. Tubular gate plate channel, 2-6. Hole f, 3. Stuffing gland, 3-1. End face n, 3-2. Protrusion a, 3-3. Edge a, 3-4. Edge → Edge b, 3-5. Protrusion b, 3-6. Edge c, 3-7. Edge h, 4. Limiting piece, 4-1. Edge d, 4-2. Edge e, 4-3. Edge f, 4-4. Edge g, 4-5. Inner diameter a, 4-6. Limiting piece key, 5. Spring, 5-1. Upper end face a, 5-2. Lower end face a, 6. Cylindrical pin, 7. Valve stem nut, 7-1. End face p 7-2. Pin hole p, 8. First valve stem 8-1. Outer diameter a 8-2. Keyway a 8-3. End, 9. Handwheel, 10. Upper tooth piece 10-1. Inner diameter b 10-2. Pin hole b 10-3. Upper tooth piece teeth, 11. Lower tooth piece 11-1. Inner diameter c 11-2. Lower tooth piece key 11-3. Lower tooth piece teeth 11-4. Plane c, 12. Round nut 12-1. End face q, 13. Sealing ring 13-1. End face r 13-2. Major diameter r 13-3. Tapered surface r 13-4. Minor diameter r, 14. Valve seat 14-1. Tapered sealing surface d 14-2. Annular step 14-3. Major diameter d, 15. Bottom nut 15-1. Upper end face b 15-2. External thread, 16. Pressure ring 16-1. Tapered surface c 16-2. Minor diameter c 16-3. Frustum 16-4. Thread c 16-5. Protrusion c 16-6. Outer diameter c 17. Second valve body 17-1. Inlet b 17-2. Outlet b 17-3. Chamber b 17-4. Thread b 17-5. Internal thread b 17-6. Pipe end b 17-7. Minor diameter b 17-8. Major diameter b 18. Bell-shaped gate 18-1. Bottom of open cavity 18-2. End face t 18-3. Bell-shaped gate passage 18-4. Hole m 18-5. Step portion 18-6. Conical surface 19. Sealing body 19-1. Sealing surface g 19-2. Flow channel g 19-3. Concave region 20. First flange 20-1. Pipe end h 20-2. Sealing surface h 21. Bracket 22. Diversion pipe 23. Valve cover 23-1. External thread 24. Third valve body 24-1. Inlet c 24-2. Outlet c 24-3. Chamber c, 25. Reducing valve seat 25-1. Large diameter e 25-2. Extension part 25-3. Small diameter e 25-4. Sealing surface i 25-5. Internal thread, 26. Second valve stem 26-1. Outer diameter b 26-2. Keyway b, 27. Ball gate 27-1. T-shaped groove 27-2. Ball gate channel 27-3. Spherical surface 27-4. Outer circle 27-5. Axial hole, 28. Sliding valve seat 28-1. Spherical sealing surface 28-2. Spherical groove 28-3. Wedge-shaped sealing surface 28-4. Flat groove, 29. Second flange 29-1. Pipe end j 29-2. Sealing surface j, 30. Bolt 30-1. Thread d, 31. Fixed sleeve 31-1. Large diameter inner hole 31-2. Small diameter inner hole Specific implementation mode

[0057] For an operating control component of a quick-opening and closing gate valve and its related seals, in the item abbreviated as a quick-opening gate valve, names such as tubular gate plate, bell-shaped gate plate, spherical gate plate, etc. are proposed for the first time. It should be understood that these name interpretations mainly emphasize that these gate plates have the characteristics of quick opening and closing compared with ordinary gate valves. This patent relates to a valve seal that can rotate around the center line of the valve body and can simultaneously rise and fall for quick opening and closing. Its opening and closing time can be achieved within 3 - 5 seconds, and it is driven by manual, pneumatic, etc. methods to control the on-off of the medium. Due to its shorter opening time and faster response speed, the quick-opening gate valve can not only meet the need for quick control and cut-off of general gate valves but also adapt to the requirements of some special industries for rapid flow regulation. However, it should be noted that the quick-opening gate valve is not currently a standard valve classification name, and it more describes a quick-opening characteristic of the valve.

[0058] In the following text description, the project name "An Operating Control Component of a Quick-Opening and Closing Gate Valve and Its Related Seals" will be referred to by the phrase "Gate Valve".

[0059] The first valve body, See Figure 1 、 Figure 2 , In the first example of the implementation class, the first valve body of the gate valve is composed of 4 parts: The first part is the medium flow channel inlet a1-1 and the medium flow channel outlet a1-2; The second part is that there is a chamber a1-3 for accommodating the tubular gate plate inside the large diameter a1-4, and a stuffing box 1-5 is formed upward in the large diameter a1-4; The stuffing box 1-5 is used for filling sealing packing when assembling the first valve stem 8; The third part is the annular body 1-6 for storing the valve stem nut 7; The fourth part is the bow-shaped frame 1-7 for connecting the annular body 1-6 and the stuffing box 1-5; The above 4 parts are jointly combined to form the first valve body of a casting gate valve main body with an integral structure.

[0060] The tubular gate plate 2, See Figure 1 、 Figure 3 、 Figure 18 , The key seal of the gate valve, the tubular gate plate 2 is respectively installed in the middle of the chamber a1-3 inside the first valve body or the chamber c24-3 inside the third valve body 24. In order to reasonably reduce material consumption as much as possible to achieve the effect of equipment weight reduction and to avoid large deformation of the material due to uneven thickness under the high-temperature state of the valve, therefore, partial sealing end entities 2-2 are formed along the circumferential direction on both sides of the tubular gate plate 2 axially in the transverse direction, and flow-through end entities 2-1 are formed along the circumferential part on both sides of its axis in the longitudinal direction; The tubular gate 2 is axially formed with a tubular gate passage 2-4 in the flow end entity 2-1 formed along the circumferential part on both longitudinal sides, and is connected to the pipeline medium when the gate valve is opened; on the sealing end entity 2-2 along the circumferential part on both transverse sides of the axis, a conical sealing surface f2-3 is formed, and when it contacts the sealing surface i25-4 of the reducing seat 25 in the first valve body 1 or the third valve body 24 or the conical sealing surface d14-1 of the seat 14 when the valve is closed, the gate valve seals the medium.

[0061] Cylindrical pin 6, valve stem nut 7, first valve stem 8, See Figure 3 、 Figure 4 、 Figure 13 、 Figure 18 , In combination with the above tubular gate 2 and the following related embodiments, a thread paired with the first valve stem 8 is provided inside the valve stem nut 7; On the upper part of the first valve stem 8, symmetric keyways a8-1 and the end 8-3 of the hole f2-6 inserted into the tubular gate 2 are provided, for operating the opening and closing movement of the gate valve by connecting the handwheel 9 or connecting pneumatic and electric devices; The end 8-3 of the first valve stem 8 is fixedly connected to the hole f2-6 of the tubular gate 2 by welding. In order to achieve the opening and closing actions of the gate valve as described above, symmetric pin holes p7-2 are provided on the circumference of the end face p7-1 of the valve stem nut 7. Among them, both ends of the positioning pin 6 are fixedly connected to the pin hole p7-2 of the valve stem nut 7 and the pin hole b10-2 of the upper tooth piece 10 respectively.

[0062] Upper tooth piece 10, lower tooth piece 11, See Figure 4 、 Figure 10 、 Figure 11 、 Figure 12 , In the first embodiment and some other embodiments mentioned above, in the upper transmission structure of all assemblies of the second valve body 17 and the third valve body 24, the combination of the connecting components including the cylindrical pin 6, the valve stem nut 7, the upper tooth piece 10, and the lower tooth piece 11 is the same. The inner diameter b10-1 of the upper tooth piece 10 passes through the outer diameter a8-1 of the first valve stem 8 or the outer diameter b26-1 of the second valve stem 26 by clearance fit. The upper tooth piece 10 and the valve stem nut 7 are connected together by the cylindrical pin 6. The lower surface of the upper tooth piece 10 and the upper surface of the lower tooth piece 11 have N involute upper tooth piece teeth 10-3 and lower tooth piece teeth 11-3. The lower tooth piece 11 also includes a lower tooth piece key 11-2 extending toward the middle from the inner diameter c11-1, and the lower tooth piece key 11-2 forms a sliding fit with the keyway a8-2 of the first valve stem 8 or the keyway b26-2 of the second valve stem 26. The upper tooth piece 10 and the lower tooth piece 11 mesh with each other during the opening and closing of the gate valve, and can also achieve overrunning, ultimately realizing the rotation and linear motion of the first valve stem 8 or the second valve stem 26.

[0063] The packing gland 3, the limit piece 4, See Figure 1 、 Figure 4 、 Figure 6 、 Figure 8 、 Figure 9 , The well-known classic packing gland 3 in the industry is to ensure that the medium inside the gate valve does not leak to the outside of the valve body, so no excessive explanation is given here. In this case, due to the need for limiting during the opening and closing of the gate valve, raised portions a3-2 and b3-5 are added to the upper part of the end face n3-1 of the packing gland 3 for limiting. The raised portions a3-2 and b3-5 are horizontally distributed and centrosymmetric on the end face n3-1 along the axial hole. In the open state of the gate valve, the edges d4-1 and f4-3 of the limit piece 4 contact the edges a3-3 of the raised portion a3-2 and the edge c3-6 of the raised portion b3-5, thereby restricting rotation; in the closed state of the gate valve, the edges e4-2 and g4-4 of the limit piece 4 contact the edge b3-4 of the raised portion a3-2 and the edge h3-7 of the raised portion b3-5, thereby restricting rotation. The limit piece 4 also includes a limit piece key 4-6 extending toward the middle from the inner diameter a4-5, and the limit piece key 4-6 forms a sliding fit with the keyway a8-2 of the first valve stem 8 or the keyway b26-2 of the second valve stem 26. The limit piece 4 realizes the restriction of the rotational movement of the first valve stem 8 or the second valve stem 26. After the rotational movement is restricted, the operation control component will drive the first valve stem 8 or the second valve stem 26 to change into a linear motion of rising or falling.

[0064] The spring 5, the round nut 12, See Figure 1 、 Figure 4 、Figure 13 , Figure 18 , Figure 20 , As introduced above, the functions of the upper tooth piece 10 and the lower tooth piece 11 during the opening and closing of the gate valve are determined by the elastic force of the spring 5, whether they mesh with each other or slip and overrun. The upper end face a5-1 of the spring 5 contacts the plane c11-4 of the lower tooth piece 11, and the lower end face a5-2 contacts the end face q12-1 of the round nut 12. The round nut 12 and the first valve stem 8 or the second valve stem 26 are fitted by threads. The spring 5 is sleeved on the first valve stem 8 or the second valve stem 26. Adjusting the round nut 12 can adjust the compression amount of the spring 5 on the first valve stem 8 or the second valve stem 26 to obtain different elastic forces, and finally realize the relevant procedures and functions for the rapid opening and closing of the gate valve.

[0065] The valve seat 14, See Figure 1 , Figure 7 , For a carbon steel gate valve, it is obviously difficult to obtain satisfactory results in surfacing a corrosion-resistant layer in the chamber a1-3 of the first valve body 1. Therefore, valve seats 14 are provided in the flow channel holes on both sides of the inlet a1-1 and the outlet a1-2 of the first valve body 1; According to the technical specifications, the valve seat 14 is made of martensitic stainless steel, and a manufacturing method is provided: the obtained body is formed in a pressing die by high-frequency heating from a preliminary sheet metal part; The fixing method of the valve seat 14 in the first valve body 1 can be selected to form a sealed contact with the first valve body 1 by expanding the annular step 14-2 in the conventional way, or the two can be connected to each other by seal welding.

[0066] The sealing ring 13, the bottom nut 15, the pressing ring 16, See Figure 1 , Figure 5 , Figure 13 , In seeking to break through the harm that the traditional gate valve connected by valve cover bolts ( Figure 22 ) is prone to leakage at the middle flange, specifically, a sealing ring 13 that can form a seal with the inner wall of the valve body is provided at the bottom of the first valve body 1, and a structure for isolating the sealed medium from the outside is implemented by jointly forming a sealing pair with the pressing ring 16 and the bottom nut 15; The outside of the large diameter r13-2 of the sealing ring 13 contacts the inner wall of the first valve body 1 or the second valve body 17; the conical surface r13-3 of the sealing ring 13 contacts the conical surface c16-1 of the pressing ring 16; the end surface r13-1 of the sealing ring 13 contacts the upper end surface b15-1 of the bottom nut 15; The minor diameter r13-4 of the sealing ring 13 is in contact with the minor diameter c16-2 of the pressure ring 16; presenting a mutually sealed state; The external thread 15-2 provided on the major diameter of the bottom nut 15 is engaged with the internal thread a1-10 of the first valve body 1 or the internal thread b17-5 of the second valve body 17.

[0067] Bolt 30, See Figure 1 、 Figure 5 、 Figure 13 、 Figure 20 , In the structure where the sealing ring 13, bottom nut 15, pressure ring 16 are combined with the first valve body 1 or the second valve body 17 to form a sealing pair, usually the pressure ring 16 can satisfy the effect of internal pressure self-sealing of the gate valve on the sealing ring 13 under the medium pressure in the sealed state. However, if the valve is in a low-pressure working state, it may not be sufficient to meet the above conditions. Therefore, the thread d30-1 of the bolt 30 is connected to the thread c16-4 of the pressure ring 16 and tightened to serve as an auxiliary sealing adjustment.

[0068] Second valve body 17, See Figure 13 、 Figure 14 , We have already described in the background the common and difficult-to-overcome quality problems of cast steel gate valve castings. The solution is to use commercially available seamless steel pipes formed by high-frequency heating and rolling to replace the existing cast steel valve body. For example, the lower part of the second valve body 17 has an open chamber b17-3 with a major diameter b17-8 for installing the bell-shaped gate 18. Above the chamber b17-3 is set to a minor diameter b17-7, and its external thread b17-4 is fixedly connected to the bracket 21. It is stretched horizontally to both sides to form a tubular feature and the pipe end b17-6. The pipe end b17-6 facilitates the insertion of the pipe end h20-1 of the first flange 20 into the chamber b17-3 of the second valve body 17 to form a sealing surface h20-2 in contact with the bell-shaped gate 18.

[0069] Bell-shaped gate 18, flow guide pipe 22, See Figure 13 、 Figure 15 、 Figure 16 、 Figure 17 , The bell-shaped gate 18 is also formed by using commercially available seamless steel pipes through high-frequency heating and rolling to replace the existing cast steel gate. On the upper surface connecting the bottom 18-1 of the open cavity, there is a flattened end face t18-2 and an upwardly protruding step portion 18-5. At the same time, there is a hole m18-4 that can be connected to the end 8-3 of the first valve stem 8, as well as a bell-shaped gate channel 18-3. The external surface forms a conical surface 18-6.

[0070] The flow guide tube 22, See also Figure 13 , The guide tube 22 is a thin-walled steel tube inserted into the bell gate channel 18-3 with an interference fit. Whether to use a gate valve for the guide tube 22 project is not a must, but an option for devices that require quite stringent fluid resistance conditions.

[0071] Sealing body 19, See also Figure 16 , Figure 17 , Normally, the bell gate 18 made of steel pipe is mainly made of carbon steel. In order to meet the technical requirements of friction wear resistance and general corrosion standards, the sealing body 19 is made of corrosion-resistant thin plate hardened material by stamping. The sealing body 19 has a curved surface of the sealing surface g19-1, a flow channel g19-2, and a concave area 19-3 on the sealing surface g19-1 that is offset 90° from the flow channel g19-2 and is concave inward. The sealing body 19 is tightly fitted and partially laser spot welded to the bell gate 18 to form a split combined sealing pair; In addition to the split-type combined sealing bell gate 18 structure, the bell gate 18 of an integrated structure with a protrusion having the same curved surface as the sealing body 19 can also be pressurized by the back hand.

[0072] The third valve body 24, See also Figure 18 , In this type of embodiment, the basic installation body of the tubular gate plate 2 and the reducing valve seat 25, which are the key components of the forged steel gate valve, is obtained by forming a seamless steel pipe by rolling (using cold pressing or hot processing) at one time. The third valve body 24 includes a pipe socket welding inlet c24-1 at one end of the transverse part that can be inserted into the external pipe and a socket welding outlet c24-2 at the other end, and a chamber c24-3 with an upward extension to accommodate the tubular gate plate 2. The interior of the chamber c24-3 is provided with an internal thread 25-5 that can be installed to match the external thread 23-1 of the valve cover 23; In view of the fact that valves are prone to leakage and cause environmental pollution, the forged steel gate valve adopts the property of one-time installation and maintenance-free. Therefore, after the valve is assembled, the valve cover 23 and the third valve body 24 are selected to be welded together by sealing welding.

[0073] Reducing valve seat 25, See also Figure 18 , Figure 19 , In the embodiment of the third valve body 24, the reduced-diameter valve seat 25 is shown to form a tubular structure with a pre-set integral cavity before assembly. In this structure, large diameters e25-1 equivalent to the inlet c24-1 and the outlet c24-2 of the third valve body 24 are formed on the left and right sides. Connected to the large diameter e25-1 are an extension part 25-2 and a small diameter e25-3. The material of this pre-set part can be martensitic stainless steel or chromium-nickel-molybdenum-titanium stainless steel, and it is also formed by seamless steel pipe through the way of rolling; The pre-set reduced-diameter valve seat 25 is processed after being configured in the third valve body 24 and fixed by seal welding to form a conical sealing surface i25-4 that matches the conical sealing surface f2-3 of the tubular gate 2.

[0074] Ball gate 27, sliding valve seat 28, See Figure 20 、 Figure 21 , Due to the setting of the wedge angle formed by the ball gate channel 27-2 of the ball gate 27 deviating above the center of the sphere, a dynamic sliding connection relationship is formed between the spherical surface 27-3 and the spherical sealing surface 28-1 of the sliding valve seat 28. When closing the valve, the second valve stem 26 drives the ball gate 27 and drives the sliding valve seat 28 to rise. When closing in place, the spherical surface 27-3, the spherical sealing surface 28-1 and the wedge-type sealing surface j29-2 of the second flange 29 are closely attached to each other to form a seal. When opening the valve, during the descending process of the second valve stem 26, an indirect disconnection state is formed between them; In order to be able to rise and descend to open and close the gate valve, the ball gate 27 is provided with a T-shaped groove 27-1 at the position where it is connected to the second valve stem 26; A fixing sleeve 31 is arranged on the outer cylinder 27-4 of the upper T-shaped groove 27-1 of the ball gate 27. The fixing sleeve 31 is provided with a large-diameter inner hole 31-1 and a small-diameter inner hole 31-2. Among them, the large-diameter inner hole 31-1 forms a fixed interlock with the upper cylindrical outer part 27-4 of the ball gate 27, and the small-diameter inner hole 31-2 is loosely sleeved on the second valve stem 26 in the form of a relatively large gap. At the lower part of the ball gate 27, a shaft hole 27-5 is provided to cooperate with the protruding part c16-5 of the pressing ring 16 to keep the ball gate 27 from deviating from the center during the operation of the gate valve; On the wedge-type sealing surface 28-3 and the spherical sealing surface 28-1 of the sliding valve seat 28, at least 2 or more concentric spherical grooves 28-2 and plane grooves 28-4 are provided to form a tortuous path, and by throttling and changing directions multiple times, the flow resistance is increased, and finally a labyrinth sealing effect of reducing leakage and lowering the leakage rate is formed.

Claims

1. An operation control assembly for a fast opening and closing gate valve and a related seal, characterized in that: the operation control assembly comprises: A hand wheel (9), a valve stem nut (7), a cylindrical pin (6), an upper tooth plate (10), a lower tooth plate (11), a spring (5), a round nut (12), a limit plate (4), a packing gland (3), a first valve stem (8), a second valve stem (26), a bracket (21), a flow guide tube (22), a valve cover (23), a bolt (30), and a fixing sleeve (31); The related sealing components include: a first valve body (1), a second valve body (17), a third valve body (24), a first flange (20), a second flange (29), a tubular gate (2), a bell gate (18), a sealing body (19), a spherical gate (27), a reducing valve seat (25), a sealing ring (13), a valve seat (14), a pressure ring (16), and a bottom nut (15); The first valve body (1) is a casting, and a stuffing box (1-5) formed on the upper part of the major diameter a (1-4) thereof, and the annular body (1-6) and the arch frame (1-7) connected thereto form an integral structure, and the interior thereof comprises an inlet a (1-1), an outlet a (1-2), and a chamber a (1-3) extending vertically between the inlet a (1-1) and the outlet a (1-2), and a conical sealing surface a (1-8) and a conical surface (1-9) are formed on both sides of the interior of the chamber a (1-3); The second valve body (17) is a pipe-shaped four-way valve, comprising an inlet b (17-1), an outlet b (17-2), a chamber b (17-3) extending upwards and a thread b (17-4) formed between the inlet b (17-1) and the outlet b (17-2), and a sliding valve seat (28) provided inside thereof for sealing with the spherical gate plate (27) and a fixing sleeve (31) for limiting the position of the spherical gate plate (27); The third valve body (24) is a three-way pipe fitting, comprising an inlet c (24-1), an outlet c (24-2), and a chamber c (24-3) extending up and down between the inlet c (24-1) and the outlet c (24-2), and different-diameter valve seats (25) are arranged inside the inlet c (24-1) and the outlet c (24-2) on both sides of the chamber c (24-3); The rotation and lifting movement of the tubular gate plate (2), the bell gate plate (18) and the spherical gate plate (27) in the chamber a (1-3) of the first valve body (1), the chamber b (17-3) of the second valve body (17) or the chamber c (24-3) of the third valve body (24) is achieved by operating the hand wheel (9) to drive the valve stem nut (7), thereby driving the upper tooth plate (10), connecting the lower tooth plate (11), and driving the first valve stem (8) or the second valve stem (26); the limit plate (4) and the packing gland (3) limit the rotation angle of the first valve stem (8) or the second valve stem (26); the torque of the spring (5) supports the upper tooth plate (10) and the lower tooth plate (11) and provides meshing force.

2. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: The process of the valve from fully open to fully closed is: First, the valve is in full open position. The tubular gate channel f (2-4) of the tubular gate (2) is aligned with the inlet a (1-1) and the outlet a (1-2), and the sealing surface f (2-3) is in a disengaged state from the conical sealing surface a (1-8) in the first valve body (1) or the conical sealing surface d (14-1) of the valve seat (14); Alternatively, the bell gate channel (18-3) of the bell gate (18) is aligned with the inlet b (17-1) and the outlet b (17-2) of the second valve body (17), and the sealing surface g (19-1) of the matching sealing body (19) and the sealing surface h (20-2) of the first flange (20) in the second valve body (17) are in a disengaged state; Alternatively, the tubular gate channel (2-4) of the tubular gate (2) is aligned with the inlet c (24-1) and the outlet c (24-2) of the third valve body (24), and the sealing surface f (2-3) is disengaged from the sealing surface i (25-4) of the reducing valve seat (25) in the third valve body (24); or the spherical gate channel (27-2) of the spherical gate (27) is aligned with the inlet b (17-1) and the outlet b (17-2) of the second valve body (17), and the wedge-shaped sealing surface (28-3) of the sliding valve seat (28) and the sealing surface j (29-2) in the second flange (29) are in a disengaged state; Turn the hand wheel (9) clockwise. The valve stem nut (7) is driven, and then the upper tooth plate (10) is driven, and then the lower tooth plate (11) is driven, and then the first valve stem (8) is driven, and then the tubular gate (2) is driven to rotate. When the valve stem nut (7) is driven, the upper tooth plate (10) is driven, and then the lower tooth plate (11) is driven, and then the first valve stem (8) is driven, and then the tubular gate (2) is driven to rotate. When the valve stem nut (7) is driven, the upper tooth plate (10) is driven, and then the lower tooth plate (11) is driven, and then the first valve stem (8) is driven. The lower tooth plate (11) is driven. Continue to turn the handwheel (9) clockwise. The valve stem nut (7) is driven. Since the rotational movement of the lower tooth plate (11) is restricted, the upper tooth plate teeth (10-3) of the upper tooth plate (10) will exceed the lower tooth plate teeth (11-3) of the lower tooth plate (11), thereby driving the first valve stem (8) to move linearly upward, and further driving the tubular gate plate (2) to move linearly upward until, The sealing surface f (2-3) of the tubular gate (2) contacts the conical sealing surface a (1-8) on the first valve body (1) or the conical sealing surface d (14-1) of the valve seat (14) to form a sealing state, and at this time, the tubular gate channel (2-4) is perpendicular to the inlet a (1-1) and the outlet a (1-2); Alternatively, the sealing surface g (19-1) of the sealing body (19) matched with the bell-shaped gate (18) contacts the sealing surface h (20-2) of the first flange (20) in the second valve body (17) to form a sealing state, and the bell-shaped gate channel (18-3) is perpendicular to the inlet b (17-1) and the outlet b (17-2) of the first flange (20); Alternatively, the sealing surface f (2-3) of the tubular gate (2) contacts the sealing surface i (25-4) of the reducing valve seat (25) in the third valve body (24) to form a sealing state, and at this time, the tubular gate channel (2-4) is perpendicular to the inlet c (24-1) and the outlet c (24-2) of the third valve body (24); Alternatively, the wedge-shaped sealing surface (28-3) of the sliding valve seat (28) contacts the sealing surface j (29-2) in the second flange (29) to form a sealing state, and at this time, the spherical gate channel (27-2) is perpendicular to the inlet b (17-1) and the outlet b (17-2) of the second flange (29); Eventually, the valve changes from a fully open state to a fully closed state; The process of the valve from fully closed to fully open is: First, the valve is in the fully closed state. Turn the hand wheel (9) counterclockwise. The valve stem nut (7) is driven. At this time, the sealing force of the close contact between the tubular gate plate (2) and the conical sealing surface a (1-8) on the valve body (1) or the conical sealing surface d (14-1) of the valve seat (14) is greater than the meshing force of the spring (5) acting on the lower tooth plate (10) on the upper tooth plate (11). Therefore, the upper tooth plate teeth (10-3) of the upper tooth plate (10) driven by the valve stem nut (7) will exceed part of the lower tooth plate teeth (11-3) of the lower tooth plate (11), thereby driving the first valve stem (8) to move linearly downward, and then driving the tubular gate plate (2) to move linearly downward until the sealing force between the tubular gate plate (2) and the conical sealing surface a (1-8) on the first valve body (1) or the conical sealing surface d (14-1) of the valve seat (14) is cancelled. Finally, The sealing surface f (2-3) of the tubular gate plate (2) is out of contact with the conical sealing surface a (1-8) on the first valve body (1) or the conical sealing surface d (14-1) of the valve seat (14); Alternatively, the sealing surface g (19-1) of the sealing body (19) matched with the bell gate (18) is out of contact with the sealing surface h (20-2) of the first flange (20) in the second valve body (17); Alternatively, the sealing surface f (2-3) of the tubular gate (2) is out of contact with the sealing surface i (25-4) of the reducing valve seat (25) in the third valve body (24); Or the wedge-shaped sealing surface (28-3) of the sliding valve seat (28) is out of contact with the sealing surface j (29-2) in the second flange (29); At this time, the sealing force has been cancelled, the spring (5) acts on the lower tooth plate (11), and the meshing force on the upper tooth plate (10) is greater than the combined force of the friction between the first valve stem (8) and the packing and the gravity of the tubular gate plate (2), and the upper tooth plate (10) and the lower tooth plate (11) return to the meshing state again; Continue to turn the handwheel (9) counterclockwise. The valve stem nut (7) is driven, and then the first valve stem (8) is driven, and then the limiting plate (4) is rotated 90 degrees until the edge e (4-2) of the limiting plate (4) contacts the edge h (3-7) of the raised portion b (3-5) of the packing gland (3). The tubular gate channel (2-4) of the tubular gate (2) is aligned with the inlet a (1-1) and the outlet a (1-2) of the first valve body (1), and the valve is opened; Alternatively, the bell-shaped gate channel (18-3) of the bell-shaped gate (18) is aligned with the inlet b (17-1) and the outlet b (17-2) of the second valve body (17), and the valve is opened; Alternatively, the tubular gate channel (2-4) of the tubular gate (2) is aligned with the inlet c (24-1) and the outlet c (24-2) of the third valve body (24), and the valve is opened; Alternatively, the spherical gate channel (27-2) of the spherical gate (27) is aligned with the inlet b (17-1) and the outlet b (17-2) of the second valve body (17), and the valve is opened; Eventually, the valve changes from a fully closed state to a fully open state.

3. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: The inner diameter a (4-5) of the limit plate (4) and the inner diameter c (11-1) of the lower tooth plate (11) extend inwardly to form two limit plate keys (4-6) and lower tooth plate keys (11-2) with mirror features, and can penetrate into the keyway a (8-2) of the first valve stem (8) to form a sliding fit. Involute upper gear plate teeth (10-3) and lower gear plate teeth (11-3) are arranged on the lower plane of the upper gear plate (10) and the upper plane of the lower gear plate (11), The tooth surface formed on the circumference of the upper tooth plate (10) includes two symmetrical pin holes b (10-2) in the inward direction.

4. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: A symmetrical pin hole p (7-2) is provided on the end face p (7-1) of the large diameter circumference of the valve stem nut (7); a symmetrical pin hole b (10-2) is provided on the upper tooth plate (10); the symmetrical pin hole p (7-2) and the symmetrical pin hole b (10-2) have the same size and the same center distance.

5. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: The upper end surface a (5-1) of the spring (5) contacts the plane c (11-4) of the lower tooth plate (11), and the lower end surface a (5-2) contacts the end surface q (12-1) of the round nut (12).

6. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: The outer diameter direction of the pressure ring (16) is configured to form a conical surface c (16-1); the end of the conical surface c (16-1) is configured to form a small diameter c (16-2); the middle portion is configured downward to form a closed truncated cone (16-3); a thread c (16-4) is provided inside the truncated cone (16-3); and the middle portion is configured upward to form a raised portion c (16-5).

7. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: The packing gland (3) is provided with a centrally symmetrical protrusion a (3-2) and a protrusion b (3-5) on the end surface n (3-1).

8. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: At least two concentric circular grooves (28-2) are arranged in the direction of the spherical sealing surface (28-1) inside the sliding valve seat (28), and at least two concentric circular grooves (28-4) are arranged in the direction of the wedge-shaped sealing surface (28-3).

9. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: The upper part connected to the spherical surface (27-3) of the spherical gate plate (27) is a cylindrical outer circle (27-4), and a T-shaped groove (27-1) movably matched with the second valve stem (26) is arranged inside the cylindrical outer circle.

10. The operation control assembly of a fast opening and closing gate valve and its related seal according to claim 1, characterized in that: The fixed sleeve (31) is provided with a large diameter inner hole (31-1) and a small diameter inner hole (31-2), wherein the large diameter inner hole (31-1) forms a fixed interlock with the upper cylindrical outer portion (27-4) of the spherical gate plate (27), and the small diameter inner hole (31-2) is loosely sleeved on the second valve stem (26) in the form of a large gap.

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