Gate valve for flare gas

Abstract

The utility model discloses a flare gas gate valve which comprises a valve body, gate plates, a valve rod and a power piece, a T-shaped head is arranged at the lower end of the valve rod to be connected with a valve plate frame, a wedge-shaped block is further arranged in the valve body to abut against the gate plates, a tension spring is further arranged between the gate plates, a guide plate is arranged in the valve body, the gate plates slide along the guide plate, and the wedge-shaped block is matched with the valve plate frame when the valve rod moves downwards. The two flashboards are driven to expand in parallel relatively, and the flashboards are pushed to move towards the sealing surface in the valve body through lifting of the valve rod; when the valve is closed, the gate plates descend in place, the wedge-shaped block and the valve plate frame drive the left gate plate and the right gate plate to execute forced sealing, so that the sealing faces are free of friction damage to form hard sealing closing, the valve rod drives the valve plate frame to ascend in the gate opening process, and the left gate plate and the right gate plate are contracted in situ through high-strength tension spring force. Therefore, the sealing surface is not damaged by all friction in the valve opening and closing process, the service life of the valve is greatly prolonged, plane or side installation of the valve is met, and the valve is suitable for vacuum negative-pressure pipeline working conditions.

Description

Technical Field

[0001] This utility model relates to the technical field of gate valves for flare gas, specifically to a gate valve for flare gas. Background Technology

[0002] Flare valves are primarily used to regulate the flow rate, pressure, and flow direction of media within pipelines, effectively preventing interference between media or equipment damage. Their design balances efficiency and durability, making them suitable for various industrial environments. Furthermore, these valves require a higher level of sealing performance.

[0003] In existing technology, gate valves isolate the medium by raising and lowering the gate, thereby achieving on / off switching. However, the gate will wear out during long-term use, which will lead to a decrease in sealing performance and even leakage. The reduced sealing performance reduces the service life of the gate valve and causes a lot of inconvenience to people. Utility Model Content

[0004] In view of the existing technology, the purpose of this utility model is to provide a gate valve for flare gas, which can make the gate plate move in parallel during the opening and closing process, so as to prevent friction damage to the sealing surface and greatly improve the service life of the valve.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a gate valve for flare gas, comprising a valve body, a gate plate, a valve stem, and a power component. The lower end of the valve stem is provided with a T-shaped head, which is connected to a valve plate frame. The valve body is also provided with two wedge-shaped blocks whose inner sides abut against the valve plate frame, and whose outer sides abut against the gate plate. A tension spring is also provided between the two gate plates. The valve body is provided with a guide plate, and the sides of the two gate plates slide against the guide plate. The wedge blocks cooperate with the valve plate frame. When the valve stem moves downward, the valve plate frame drives the two gate plates to expand relatively parallel, pushing the gate plates toward the sealing surface abutting the valve body.

[0006] As a further feature of the above scheme, the valve plate frame is provided with a sliding groove hole, the gate plate is provided with a pin that matches the sliding groove hole, the sliding groove hole is also provided with a bushing, the pin extends into the bushing, the tension spring is located inside the bushing, and its two ends are respectively fixed to the bottom of the pin, for pulling the two gate plates towards the center.

[0007] As a further feature of the above scheme, the wedge block is provided with an inclined surface, and the valve plate frame is provided with a V-shaped drive surface that matches the inclined surface.

[0008] As a further provision of the above scheme, the valve body also includes a valve cover, the valve cover is provided with a packing groove, the packing groove is provided with sealing packing and a gland for pressing the sealing packing, the valve cover is also provided with a grease injection valve, and the outlet of the grease injection valve is connected to the packing groove.

[0009] Beneficial effects: The valve of this utility model is equipped with a guide plate to guide the lifting and lowering movement of the gate. The guide plate structure allows the valve to better adapt to flat or side installation. When the valve is closed, the power component drives the valve stem to lower the gate. When it reaches the sealing position, the left and right gates stop moving downward. Then, through the wedge block and the valve plate frame, the left and right gates are driven to perform forced sealing, so that the sealing surface achieves a hard seal without friction damage. When the valve is opened, the valve stem drives the valve plate frame to rise. After the valve plate frame rises, a gap appears in the middle of the wedge block. The left and right gates retract to their original positions through the force of the high-strength tension spring, and the gate begins to open. During the opening and closing process, the sealing surface is not subject to any friction damage. This double gate opening and closing design will greatly improve the service life of this valve. The double gate opening tension spring structure makes this utility model gate valve suitable for vacuum negative pressure pipeline conditions. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the flare-specific gate valve of this utility model.

[0011] Figure 2 This is a schematic diagram of the valve plate bracket and wedge block assembly in this embodiment.

[0012] Reference numerals: 1. Valve body; 10. Power component; 11. Sealing surface; 12. Valve cover; 13. Packing groove; 14. Guide plate; 15. Tension spring; 16. Gland; 17. Grease injection valve; 18. Sealing packing; 2. Gate; 3. Wedge block; 31. Inclined part; 32. V-shaped drive surface; 4. Valve plate bracket; 41. Slide groove hole; 42. Insert pin; 43. Bushing; 5. Valve stem. Detailed Implementation

[0013] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0014] like Figure 1-2 The present invention discloses a gate valve for flare gas, which includes a valve body 1, a gate plate 2, a valve stem 5, and a power component 10. The lower end of the valve stem 5 is provided with a T-shaped head, and the T-shaped head is connected to a valve plate frame 4. The valve body 1 is also provided with two wedge-shaped blocks 3 whose inner sides abut against the valve plate frame 4, and whose outer sides abut against the gate plate 2. A tension spring 15 is also provided between the two gate plates 2. A guide plate 14 is provided inside the valve body 1. The sides of the two gate plates 2 abut against the guide plate 14 and slide. The wedge blocks 3 cooperate with the valve plate frame 4. When the valve stem 5 moves downward, the valve plate frame 4 drives the two gate plates 2 to expand relatively parallel, pushing the gate plates 2 towards the sealing surface 11 inside the valve body 1.

[0015] As a further provision of the above scheme, the valve plate frame 4 is provided with a sliding groove hole 41, and the gate plate 2 is provided with a pin 42 that matches the sliding groove hole 41. A bushing 43 is also provided in the sliding groove hole 41. The pin 42 extends into the bushing 43. The tension spring 15 is located inside the bushing 43, and its two ends are fixed to the bottom of the pin 42 respectively. It is used to pull the two gate plates 2 towards the center. In this embodiment, the tension spring 15 is set inside the pin 42, and the bushing 43 is placed outside the pin 42. The bushing 43 is set inside the sliding groove hole 41. In use, the bushing 43 can guide the insertion between the pin 42 and the sliding groove hole 41 to avoid misalignment.

[0016] As a further feature of the above scheme, the wedge block 3 is provided with an inclined surface 31, and the valve plate frame 4 is provided with a V-shaped drive surface 32 that matches the inclined surface 31.

[0017] As a further provision of the above scheme, the valve body 1 also includes a valve cover 12, the valve cover 12 is provided with a packing groove 13, the packing groove 13 is provided with a sealing packing 18 and a pressure cap 16 for pressing the sealing packing 18, the valve cover 12 is also provided with a grease injection valve 17, the outlet of the grease injection valve 17 is connected to the packing groove 13. The purpose of this further provision is that the valve stem 5 sealing packing 18 part of the valve is provided with a double seal formed by the packing and grease injection, that is, when the valve stem 5 sealing packing 18 leaks due to aging, damage, etc., the staff can inject 7903# sealing grease from the grease injection valve 17 to ensure the temporary normal operation of the pipeline.

[0018] like Figure 1-2 The present invention discloses a gate valve for flare gas, which includes a valve body 1, a valve cover 12, a valve stem 5, and a power component 10. Within the valve cavity formed by the valve body 1 and the valve cover 12, a gate plate 2, a guide plate 14, a valve plate bracket 4, and a wedge block 3 are also provided. As shown in the figure, the gate plate 2 of this embodiment of the gate valve... Figure 1 At the indicated height position, the valve stem 5, driven by the power component 10, is driven to raise and lower the gate 2. The guide plate 14 inside the valve body 1 guides the gate 2. The function of the guide plate 14 includes, but is not limited to, guiding the raising and lowering position of the gate 2 and allowing the gates 2 on both sides to move according to the designed raising and lowering position. Thus, under the drive of the valve stem 5, the left and right gates 2 are tightly fitted to the sealing surfaces 11 of the valve body 1 on both sides to achieve a sealing effect.

[0019] Furthermore, such as Figure 1 and Figure 2 The valve stem 5 shown has a T-shaped head at its end inside the valve body 1, and the upper end of the valve plate frame 4 has a linkage groove that matches the T-shaped head. The valve stem 5 is inserted into the linkage groove from the side, and the extension and retraction of the valve stem 5 drives the valve plate frame 4 to rise and fall. Figure 2 As shown, in this embodiment, a wedge block 3 is also provided between the gate 2 and the valve plate frame 4, such as... Figure 2 As shown, in this embodiment, the wedge-shaped block 3 is provided with two parts, left and right, which respectively abut against the two gate plates 2, as shown. Figure 2 The valve plate frame 4 and the wedge block 3 are respectively provided with a V-shaped drive surface 32 and an inclined surface 31. The valve plate frame 4 also includes a frame groove, and the wedge block 3 has a grooved post that is smaller than the frame groove in the vertical direction and has a sliding groove hole 41. During installation and use, the grooved post is located within the frame groove. Figure 1 and Figure 2 As shown, the limiting groove column of the gate plate 2 will always move within the frame groove. When the valve stem 5 drives the valve plate frame 4 to rise and fall, the wedge block 3 will be driven to move upwards. However, since the frame groove is larger than the groove column, the lifting linkage between the wedge block 3 and the valve plate frame 4 has a certain delay. Furthermore, based on the inclined surface drive of the inclined surface 31 and the V-shaped drive surface 32, the following is achieved:

[0020] ① When the valve is closed: When the power component 10 pushes the valve stem 5 down to the valve plate frame 4, the inclined part 31 of the valve plate frame 4 presses on the V-shaped drive surface 32 on the wedge block 3. The wedge block 3 then works to expand the left and right valve plate frames 4 in parallel. At the same time, the left and right gate plates 2 push towards the sealing surface 11 of the valve body 1, forcing the gate plate 2 to tightly fit with the sealing surface 11 to achieve a seal.

[0021] ② When the valve is opened: Under the action of the power component 10, the valve stem 5 moves upward, and the T-shaped head of the valve stem 5 moves upward, thereby releasing the inclined surface cooperation driving force between the inclined surface 31 and the V-shaped drive surface 32. During the upward process, the tension springs 15 set on the two gate plates 2 pull the gate plates 2 closer to the center, and with the push of the medium, the left and right gate plates 2 push the valve plate frames 4 on both sides to retract and move inward. Thus, under the push of the tension springs 15 and the medium pressure, the left and right gate plates 2 retract to completely disengage, and the medium flow channel of the valve body 1 opens rapidly until the gate plate 2 rises and the valve is opened to the point where there is no flow resistance in the flow channel, thus reaching the fully open state of the valve.

[0022] like Figure 1 In the embodiment shown, the valve sealing surface 11 adopts a hard seal. The sealing surface 11 of the valve body 1 and the gate 2 are made of wear-resistant alloy steel, hard alloy or other wear-resistant materials through overlay welding. By using better materials, the service life is improved. The wedge block 3 and the valve plate bracket 4 enable the gate 2 to have a parallel expansion movement when opening and closing, which reduces the friction between the gate 2 and the valve body 1 in the vertical direction. The gate 2 and the valve seat inside the valve body 1 adopt a parallel moving structure, which makes the friction coefficient of the sealing surface 11 small and the sealing surface achieves no friction damage. As a result, the opening torque is relatively smaller, about half that of a normal gate. Furthermore, the double gate 2 setting gives it a bidirectional sealing function (it can also be made into a unidirectional sealing structure).

[0023] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A gate valve for flare gas, comprising a valve body (1), a gate (2), a valve stem (5), and a power component (10), characterized in that: The lower end of the valve stem (5) is provided with a T-shaped head, which is connected to a valve plate frame (4). The valve body (1) is also provided with two wedge-shaped blocks (3) whose inner sides abut against the valve plate frame (4). The outer sides of the wedge-shaped blocks (3) abut against the gate plate (2). A tension spring (15) is provided between the two gate plates (2). The valve body (1) is provided with a guide plate (14). The sides of the two gate plates (2) abut against the guide plate (14) and slide. The wedge-shaped blocks (3) cooperate with the valve plate frame (4). When the valve stem (5) moves downward, the valve plate frame (4) drives the two gate plates (2) to expand relatively parallel, pushing the gate plates (2) to move towards the sealing surface (11) inside the valve body (1).

2. A gate valve for flare gas according to claim 1, characterized in that: The valve plate frame (4) is provided with a sliding groove hole (41), and the gate plate (2) is provided with a plug (42) that matches the sliding groove hole (41).

3. A gate valve for flare gas according to claim 2, characterized in that: The groove hole (41) is also provided with a bushing (43), the insert (42) extends into the bushing (43), and the tension spring (15) is located inside the bushing (43), with both ends fixed to the bottom of the insert (42) to pull the two side gates (2) towards the center.

4. A gate valve for flare gas according to claim 1, characterized in that: The wedge block (3) is provided with a beveled surface (31), and the valve plate frame (4) is provided with a V-shaped drive surface (32) that matches the beveled surface (31).

5. A gate valve for flare gas according to claim 1, characterized in that: The valve body (1) also includes a valve cover (12), the valve cover (12) is provided with a packing groove (13), the packing groove (13) is provided with a sealing packing (18) and a gland (16) for pressing the sealing packing (18).

6. A gate valve for flare gas according to claim 5, characterized in that: The valve cover (12) is also provided with a grease injection valve (17), and the outlet of the grease injection valve (17) is connected to the packing groove (13).

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