Fluorine-lined gate valve with elastic gate

Abstract

The flexible gate valve with fluoropolymer lining includes a valve body, a gate, an upper valve cover, a valve stem, and a drive device for rotating the valve stem. Both ends of the outer wall of the gate are beveled, and each end is fitted with a matching fluoropolymer lining. An elastic layer is connected to the inner wall of each of the two fluoropolymer linings, forming a soft seal that contacts the outer wall of the gate. Matching abutments are provided on the outer walls of both fluoropolymer linings, and fixing bolts are rotatably connected to the interior of each abutment. Because the elastic layer and the fluoropolymer lining work together to form a soft seal structure, it isolates corrosive fluids from contacting the sealing parts of the gate, improving the service life of the gate seal and preventing long-term fluid erosion. Combined with the beveled trapezoidal sealing platform design, it significantly reduces the number of friction cycles between the lining and the valve body during gate opening and closing. Simultaneously, the soft seal can adapt to deformation caused by temperature differences, maintaining long-term stable sealing performance and improving system reliability.

Description

Technical Field

[0001] This utility model relates to the technical field of fluoropolymer-lined gate valves, specifically to a resilient gate valve lined with fluoropolymer. Background Technology

[0002] A fluoropolymer-lined gate valve is a type of valve commonly used for conveying and controlling corrosive fluids. The opening and closing element of a fluoropolymer-lined gate valve is a gate, and the direction of the gate's movement is perpendicular to the direction of the fluid. At the same time, gate valves can only be fully open or fully closed, and cannot be used for regulation or throttling. Therefore, fluoropolymer-lined gate valves are usually used in applications involving the conveying of corrosive fluid media.

[0003] According to Chinese Patent No. CN 219221310 U, a fluoropolymer-lined gate valve is disclosed, solving the problem of easy fluoropolymer lining detachment. The valve body has an inclined boss on its inner wall, protruding towards the valve stem and arranged between the flow channel and the valve cavity. The inclined boss has an inclined working surface located within the valve cavity and inclined relative to the valve stem axis. The gate has an upper annular lug, positioned along the upper semi-circular arc of the gate near the valve stem. The upper annular lug and the inclined working surface are tightly fitted together along the inclined direction of the working surface to form a sealing connection. The inclined working surface is inclined relative to the valve stem's direction of movement. When the annular lug on the gate is tightly fitted against the inclined working surface, a static friction contact is formed, improving the friction mode of the sealing surface, effectively reducing the occurrence of fluoropolymer lining detachment, and minimizing damage to the sealing surface, especially between the flow channel and the valve cavity. This avoids leakage contact with corrosive media and extends the valve's service life.

[0004] Although the device uses the ring lugs on the gate plate to press against the inclined working surface, forming a static friction contact, which effectively reduces the occurrence of fluoropolymer lining peeling, and the outer wall of the gate plate and the inner wall of the valve body are lined with a first fluoropolymer lining layer 4 and a second fluoropolymer lining layer 5 respectively to improve the overall corrosion resistance of the valve body, the phenomenon of fluoropolymer lining peeling still occurs in actual use, thus affecting the sealing between the gate plate and the valve body and the service life. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the problem that the fluoropolymer lining layer of the existing fluoropolymer-lined gate valve will still fall off after long-term rinsing in actual use, thus affecting the sealing performance and service life between the gate and the valve body.

[0006] The technical solution adopted to solve the above technical problems is:

[0007] A resilient fluoropolymer-lined gate valve includes a valve body, a gate, an upper valve cover, a valve stem, and a drive device for rotating the valve stem. Both ends of the outer wall of the gate are sloped, and each end is fitted with a matching fluoropolymer liner. The inner walls of both fluoropolymer liners are connected to an elastic layer, forming a soft seal that contacts the outer wall of the gate. Each outer wall of the fluoropolymer liner has a matching abutment plate, and the interior of each abutment plate is rotatably connected to a fixing bolt. One end of each fixing bolt penetrates the corresponding fluoropolymer liner and is threaded into the interior of the gate, controlling the tight fit between the fluoropolymer liner and the elastic layer and the outer wall of the gate. The soft seal also adapts to deformation caused by temperature differences. The upper and lower sides of the outer wall of the gate are provided with trapezoidal sealing ramps that match the slopes, reducing the number of frictions between the fluoropolymer liner and the trapezoidal sealing ramps when the gate moves upwards.

[0008] As a preferred technical solution of this utility model, a sealing groove is provided below the inner wall of the fluid channel inside the valve body, and an upper valve cavity connected to the fluid channel is provided above the inner wall of the valve body. The two trapezoidal sealing ramps are respectively fixedly connected to the valve body at the opposite end near the sealing groove and the upper valve cavity. The ramps increase the sealing capacity of the trapezoidal sealing ramps.

[0009] As a preferred technical solution of this utility model, the top of the trapezoidal sealing ramp is provided with a matching sealing seat. Both sealing seats are made of elastic material to further enhance the sealing ability when the gate is closed. Both sealing seats are fixedly connected to the gate.

[0010] As a preferred technical solution of this utility model, both ends of the outer wall of the gate are provided with movable slots, and the two fluoroplastic linings are respectively disposed inside the corresponding movable slots.

[0011] As a preferred embodiment of this utility model, the diameter of the internal fluid channel of the valve body is smaller than the outer diameter of the gate, and the outer walls of the two fluoroplastic liners are coated with fluorinated primer and thick PFA coating from the inside to the outside.

[0012] As a preferred embodiment of this utility model, the top of the gate is connected to a mounting base, the valve stem is rotatably connected inside the mounting base, the upper end of the valve stem passes through the upper valve cover and is connected to a driving device, and the upper valve cover is detachably installed on the top of the valve body.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention forms a soft-seal structure through the synergy of an elastic layer and a fluoroplastic liner, which simultaneously isolates corrosive fluids from contact with the sealing parts of the gate, thereby improving the service life of the gate seal and preventing it from being affected by long-term fluid scouring. Combined with the inclined trapezoidal sealing platform design, it significantly reduces the number of frictions between the liner and the valve body when the gate is opened and closed. At the same time, the soft seal can adapt to deformation caused by temperature differences, maintain long-term stable sealing performance, and improve the reliability of system operation.

[0015] In addition, the fluoroplastic liner is installed through a movable slot and pressed by a backing plate and fixing bolts, enabling detachable maintenance and facilitating later replacement, thus avoiding complete scrapping. The double protection of the fluorinated primer and thick PFA coating on the outer wall of the liner further enhances the corrosion resistance and erosion resistance, extends the service life of the gate valve in highly corrosive media, and reduces maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main cross-sectional structure of the present utility model;

[0017] Figure 2 This is a schematic diagram of the connection structure of the gate, elastic layer and abutment plate of this utility model;

[0018] Figure 3 This is a schematic diagram of the overall structure of this utility model.

[0019] Reference numerals in the attached drawings: 1. Valve body; 2. Gate; 3. Upper valve cover; 4. Valve stem; 5. Drive unit; 6. Sealing groove; 7. Upper valve chamber; 8. Trapezoidal sealing ramp; 9. Sealing seat; 10. Mounting seat; 11. Fluoroplastic liner; 12. Movable slot; 13. Elastic layer; 14. Abutment plate; 15. Fixing bolt. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0025] Example 1

[0026] exist Figures 1-3 This utility model provides a technical solution: a fluoropolymer-lined gate valve with elastic gate, including a valve body 1, a gate 2, an upper valve cover 3, a valve stem 4, and a drive device 5 for rotating the valve stem 4. Both ends of the outer wall of the gate 2 are beveled, and both ends of the outer wall of the gate 2 are provided with matching fluoropolymer linings 11. The inner walls of both fluoropolymer linings 11 are connected to elastic layers 13, forming a soft seal and contacting the outer wall of the gate 2. The outer walls of both fluoropolymer linings 11 are provided with matching abutments 14, and the interiors of both abutments 14 are rotatably connected to fixing bolts 15. One end of each fixing bolt 15 penetrates the corresponding fluoropolymer lining. Layer 11 is threaded inside the gate 2. While rotating the fixing bolt 15, the fluoroplastic liner 11 and elastic layer 11 are pushed through the abutment plate 14 to tightly adhere to the outer wall of the gate 2. This is used to isolate the part of the gate 2 used to isolate the fluid. The fluoroplastic liner 11 and elastic layer 13 are tightly adhered to the outer wall of the gate 2. At the same time, the soft seal formed adapts to the deformation caused by the temperature difference, further improving the isolation effect of the gate 2. The upper and lower sides of the outer wall of the gate 2 are provided with trapezoidal sealing ramps 8 that match the inclined surface, so that when the gate 2 moves upward, the number of frictions between the fluoroplastic liner 11 and the trapezoidal sealing ramps 8 on the inclined surface is reduced.

[0027] Both ends of the outer wall of the gate 2 are provided with movable slots 12, and two fluoroplastic liners 11 are respectively set inside the corresponding movable slots 12. During the use of the equipment, when a corrosive fluid is transported into the valve body 1, the corrosion-resistant fluoroplastic liner 11 isolates the fluid from the sealing side of the gate 2, thereby fundamentally solving the problem of corrosive fluid contact with the gate 2 affecting its service life. At the same time, by rotating the fixing bolt 15, the fluoroplastic liner 11 can be removed from the gate 2, which also facilitates subsequent maintenance and replacement.

[0028] In one aspect of this embodiment, a sealing groove 6 for connecting a sealing gate 2 is provided below the inner wall of the fluid channel inside the valve body 1, and an upper valve chamber 7 connected to the fluid channel is provided above the inner wall of the valve body 1 for sliding within the upper valve chamber 7 when the gate 2 moves upward. Two trapezoidal sealing ramps 8 are respectively fixedly connected to the valve body 1 at opposite ends near the sealing groove 6 and the upper valve chamber 7. The ramps increase the sealing capacity of the trapezoidal sealing ramps 8, and at the same time, the trapezoidal sealing ramps reduce the number of contacts with the fluoroplastic liner 11. In conjunction with the sealing seat 9, the fluoroplastic liner 11 and the trapezoidal sealing ramps 8 are in linear contact, thereby improving service life.

[0029] The top of the trapezoidal sealing ramp 8 is provided with a matching sealing seat 9. Both sealing seats 9 are made of elastic material, which can be corrosion-resistant rubber material. The trapezoidal sealing ramp 8 and the sealing seat 9 cooperate with each other, and the contact surface matches the ramp surface of the gate 2, so that the gate 2 moves down and the sealing becomes tighter, further enhancing the sealing ability of the gate 2 when it is closed. Both sealing seats 9 are fixedly connected to the gate 2.

[0030] In one aspect of this embodiment, the diameter of the internal fluid channel of the valve body 1 is smaller than the outer diameter of the gate 2, thereby improving the sealing effect of the gate 2 in blocking the fluid. The outer walls of the two fluoroplastic liners 11 are coated with fluorinated primer and thick PFA from the inside to the outside. The fluorinated primer enhances the adhesion, and the combination of the two provides corrosion resistance and erosion resistance, thereby improving the service life of the equipment.

[0031] In one aspect of this embodiment, the top of the gate 2 is connected to a mounting base 10, the valve stem 4 is rotatably connected inside the mounting base 10, the upper end of the valve stem 4 passes through the upper valve cover 3 and is connected to a drive device 5, and the upper valve cover 3 is detachably installed on the top of the valve body 1.

[0032] The working principle of this utility model is as follows: First, a sealing groove 6 is milled below the fluid channel of the valve body 1, and an upper valve cavity 7 is bored above it. Trapezoidal sealing ramps 8 are welded to the opposite ends of the sealing groove 6 and the upper valve cavity 7, respectively. The ramps are precision machined to ensure that the included angle with the ramp of the gate 2 is consistent. Next, the fluoroplastic liner 11 is installed into the movable slots 12 at both ends of the gate 2. Here, the fluoroplastic liner 11 can be a fluorine-containing corrosion-resistant protective cover. The protective cover is integrally molded by injection molding and matches the outer wall of the gate 2. Then, the elastic layer 13 and the abutment plate 14 are pressed in sequentially, and the fixing screws are screwed in. The bolt 15 ensures that the lining 11 and the elastic layer 13 are tightly fitted to the outer wall of the gate 2, forming a soft seal that can deform with temperature differences. Subsequently, a fluorinated primer and a thick layer of PFA are sprayed sequentially on the outer wall of the protective cover. The diameter of the valve body channel is slightly smaller than the outer diameter of the gate 2 to ensure an interference seal when closed. During operation, the drive device 5 drives the valve stem 4 to rotate, and the gate 2 slides up and down along the trapezoidal sealing ramp 8. The ramp surface makes linear contact with the sealing seat 9, reducing the friction of the lining 11. The elastic layer 13 adapts to the pressure to compensate for thermal expansion and contraction, preventing the fluorinated lining from falling off, thereby completing the opening and closing and maintaining zero leakage for a long time.

[0033] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A resilient fluoropolymer-lined gate valve, comprising a valve body (1), a gate (2), an upper valve cover (3), a valve stem (4), and a drive device (5) for rotating the valve stem (4), characterized in that: Both ends of the outer wall of the gate (2) are sloped. Both ends of the outer wall of the gate (2) are provided with matching fluoroplastic linings (11). The inner walls of the two fluoroplastic linings (11) are connected with elastic layers (13) to form a soft seal and contact the outer wall of the gate (2). The outer walls of the two fluoroplastic linings (11) are provided with matching abutments (14). The interiors of the two abutments (14) are rotatably connected with fixing bolts (15). One end of (15) passes through the corresponding fluoroplastic liner (11) and is threaded into the inside of the gate (2), controlling the fluoroplastic liner (11) and elastic layer (13) to fit tightly against the outer wall of the gate (2), while the soft seal formed adapts to the deformation caused by temperature difference. The upper and lower sides of the outer wall of the gate (2) are provided with trapezoidal sealing ramps (8) that match the inclined surface, so that when the gate (2) moves upward, the number of frictions between the fluoroplastic liner (11) and the trapezoidal sealing ramps (8) on the inclined surface is reduced.

2. The elastomeric flapper diaphragm valve of claim 1, wherein: A sealing groove (6) is provided below the inner wall of the fluid channel inside the valve body (1), and an upper valve chamber (7) connected to the fluid channel is provided above the inner wall of the valve body (1). Two trapezoidal sealing ramps (8) are respectively fixedly connected to the valve body (1) near the opposite end of the sealing groove (6) and the upper valve chamber (7). The ramps increase the sealing capacity of the trapezoidal sealing ramps (8).

3. The elastomeric flapper diaphragm valve of claim 2, wherein: The top of the trapezoidal sealing ramp (8) is provided with a matching sealing seat (9). Both sealing seats (9) are made of elastic material to further enhance the sealing ability of the gate (2) when it is closed. Both sealing seats (9) are fixedly connected to the gate (2).

4. The elastomeric flapper diaphragm valve of claim 1, wherein: Both ends of the outer wall of the gate (2) are provided with movable slots (12), and the two fluoroplastic linings (11) are respectively disposed inside the corresponding movable slots (12).

5. The elastomeric flapper diaphragm valve of claim 1, wherein: The diameter of the internal fluid channel of the valve body (1) is smaller than the outer diameter of the gate (2), and the outer walls of the two fluoroplastic liners (11) are coated with fluorinated primer and thick PFA from the inside to the outside.

6. The elastomeric flapper diaphragm valve of claim 1, wherein: The top of the gate (2) is connected to a mounting base (10), the valve stem (4) is rotatably connected inside the mounting base (10), the upper end of the valve stem (4) passes through the upper valve cover (3) and is connected to a drive device (5), and the upper valve cover (3) is detachably installed on the top of the valve body (1).

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