Stamping punch for valve body and valve seat of high-pressure butt welding gate valve

Abstract

The utility model discloses a high-pressure butt welding gate valve body and valve seat stamping punch, which belongs to the technical field of high-pressure gate valve preparation, and comprises a pressing rod used for being inserted into an inner cavity channel of a valve body and a pressing head located at one end of the pressing rod and used for extruding a valve seat, and the diameter of the head end of the pressing head is smaller than that of an inner hole of the valve seat. The diameter of the tail end of the pressing head is larger than that of an inner hole of the valve seat. The pressing rod is arranged on the side where the tail end of the pressing head is located. The pressure head is equally cut into at least three pressure head sheets; an inner cavity channel of the valve body comprises a first channel and a second channel which are communicated with each other, the diameter of the first channel is larger than that of the second channel, the diameter of the first channel is larger than that of the tail end of the pressing head, and the length of the first channel is larger than that of the pressing head. According to the utility model, the pressure head sheets can be conveniently arranged in the inner cavity channel of the valve body one by one, the stamping punch can adapt to the small-caliber high-pressure gate valve, the valve seat of the small-caliber high-pressure gate valve can be effectively stamped, and the technical problem that the valve seat of the small-caliber high-pressure gate valve is difficult to stamp is solved.

Description

Technical Field

[0001] This utility model mainly relates to the field of high-pressure gate valve manufacturing technology, specifically a high-pressure butt-welded gate valve body and valve seat stamping punch. Background Technology

[0002] Gate valves are primarily used to cut off or connect the medium in a pipeline. Due to their structural characteristics, high-pressure gate valves offer better sealing performance in pipelines with higher medium pressures and are widely used in industries such as petrochemicals, power generation, shipbuilding, pharmaceuticals, and aerospace. Because of the high pressure, flange bolt connections between valves and pipelines often fail to provide a proper seal; therefore, butt weld connections are typically used. In a typical oil refining unit, gate valves account for approximately 80% of the total valve demand. While the demand for cast steel gate valves is relatively low, the majority are forged butt-welded gate valves. In recent years, with the rapid development of the petrochemical industry, the demand for high-pressure gate valves has been increasing.

[0003] Due to the high pressure of the pipeline, the selected pipe wall thickness is relatively thick. Under the same outer diameter conditions, the corresponding inner diameter of the pipeline is smaller, resulting in a smaller weld hole for the valves used on the pipeline. It often happens that the valve end bore is much smaller than the valve seat inner diameter. Since the valve seat of a high-pressure gate valve is pressed together by a punch through the inner holes at both ends, when the end bores are small, the punch outer diameter is larger than the end bore diameters, making it impossible to press the valve seat. Currently, the common practice is to enlarge the valve body end bore, press in the valve seat, then weld the valve body end bore full, and finally machine the valve body end bore diameter to match the pipeline inner diameter. After welding, radiographic testing of the weld bevel often reveals many defects such as porosity and slag inclusions. If these are not addressed, the pipeline will have a risk of leakage. Addressing these defects requires rework, removing and re-welding the welded portion, followed by another radiographic test. This processing method has problems such as high material consumption, extremely low efficiency, and safety hazards. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing solutions are too simplistic. It mainly provides a high-pressure butt-welded gate valve body and valve seat stamping punch to solve the technical problem of difficult stamping of valve seats for small-diameter high-pressure gate valves mentioned in the background.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A high-pressure butt-welded gate valve body and valve seat stamping punch, the valve seat stamping punch includes a pressure rod for inserting into the inner cavity channel of the valve body and a pressure head located at one end of the pressure rod for pressing the valve seat. The diameter of the head end of the pressure head is smaller than the diameter of the inner hole of the valve seat, and the diameter of the tail end of the pressure head is larger than the diameter of the inner hole of the valve seat. The pressure rod is located on the side where the tail end of the pressure head is located. The pressure head is equally cut into at least three pressure head pieces.

[0007] The valve body's internal cavity includes a first channel and a second channel that are interconnected. The diameter of the first channel is greater than the diameter of the second channel, the diameter of the first channel is greater than the diameter of the tail end of the pressure head, and the length of the first channel is greater than the length of the pressure head.

[0008] Furthermore, a blind hole is provided at the tail end of the pressure head for inserting the pressure rod.

[0009] Furthermore, the diameter of the blind hole is equal to the diameter of the pressure rod.

[0010] Furthermore, a frustum is formed on the circumferential surface of the pressure head, and the angle between the generatrix of the frustum and the central axis is 10° to 12°.

[0011] Furthermore, the head of the pressure head is formed with a chamfer of 60°±0.5°.

[0012] Furthermore, the diameter of the pressure rod is smaller than the diameter of the second channel (the diameter d1 of the pressure rod is 0.2 to 0.5 mm smaller than the D1 dimension on the valve body 1); the length of the pressure rod is greater than or equal to the length of the inner cavity channel of the valve body.

[0013] Furthermore, the width and height of each pressure head are smaller than the inner diameter of the valve seat.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention sets the stamping punch as a separate pressure head and pressure rod, and cuts the pressure head into multiple pressure head pieces, which facilitates the placement of the pressure head pieces one by one into the inner cavity channel of the valve body. A first channel with a diameter larger than the diameter of the pressure head is opened in the valve body to facilitate the assembly of the pressure head pieces into a complete pressure head. In this way, the stamping punch can be adapted to small-diameter high-pressure gate valves and effectively realize the stamping of its valve seat, thus solving the technical problem of difficult stamping of valve seats of small-diameter high-pressure gate valves.

[0016] In this invention, the valve body's internal cavity channel is directly machined, eliminating the need for the complex process of "first enlarging the valve body's end hole, then pressing in the valve seat, then welding the valve body's end hole to fill it, and finally machining the valve body's end hole diameter to match the pipe's inner diameter." This eliminates leakage caused by welding defects such as weld porosity or incomplete penetration, saving costs and improving safety. Furthermore, radiographic testing of the valve body's bevels or welds on the pipe ensures a one-time pass, eliminating the need for rework or returns due to welding defects like weld porosity or incomplete penetration, significantly improving production efficiency.

[0017] This invention has good versatility. A valve of one diameter only requires one specification of pressure head and pressure rod, eliminating the need to process pressure rods of various specifications according to the size of the pipe opening.

[0018] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the pressure head structure of this utility model, wherein Figure (a) is a left view and Figure (b) is a front view;

[0021] Figure 3 This is a schematic diagram of the pressure bar structure in this utility model.

[0022] Reference numerals: 1. Valve body; 11. First channel; 12. Second channel; 2. Valve seat; 3. Pressure head; 31. Blind hole; 32. Frustum; 4. Pressure rod. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Example 1: Please refer to the appendix for details. Figure 1 In high-pressure weld gate valves, the valve body 1 and valve seat 2 need to be sealed by stamping, so a punch needs to pass through the channels at both ends of the valve body 1. However, the D1 dimension on the valve body 1 is machined according to customer requirements, and sometimes the D1 dimension is very small, making it impossible for the punch to pass through.

[0027] Please refer to the attached document carefully. Figure 1 - Appendix Figure 3 This invention proposes a high-pressure butt-welding gate valve seat stamping punch, comprising a pressure head 3 and a pressure rod 4, specifically:

[0028] The diameter d1 of the pressure rod 4 is 0.5mm smaller than the D1 dimension on the valve body 1, and its length is determined according to the length of the channel on the valve body 1 (the length of the pressure rod 4 is greater than or equal to the length of the channel inside the valve body 1).

[0029] The diameter of the tail end of the pressure head 3 is larger than that of its head end, and its tail end diameter is larger than the inner diameter D2 of the valve seat 2; otherwise, it cannot be stamped. A blind hole 31 is machined at the tail end of the pressure head 3, and the diameter d2 of the blind hole 31 matches the d1 dimension of the pressure rod 4. A frustum torus 32 with an angle a=12° is machined on the outer circle of the pressure head 3 for stamping the valve seat 2. A chamfer with an angle b=60°±0.5° is machined on the head of the pressure head 3. After the chamfer is completed, the head dimension d3 of the pressure head 3 is smaller than the inner diameter D2 of the valve seat 2.

[0030] To allow the pressure head 3 to be inserted into the channel of the valve body 1, after the pressure head 3 is machined, it is cut into four equally sized pressure head pieces using wire cutting. Each pressure head piece can be individually inserted into the cavity of the valve body 1 from the inner hole of the valve seat 2. Therefore, the outer diameter of the pressure head 3 also needs to be controlled. The inner cavity channel of the valve body 1 is machined into a structure that is larger inside and smaller outside, including a first channel 11 located on the inner side and a second channel 12 located on the outer side. The first channel 11 and the second channel 12 are interconnected and aligned, and the diameter D1 of the second channel 12 is machined according to customer requirements to match the pipeline. The diameter D3 of the first channel 11 is determined based on the outer diameter of the pressure head 3 and must be larger than the outer diameter of the pressure head 3. The length of the first channel 11 must also be longer than the length of the pressure head 3.

[0031] During stamping, the valve seat 2 is first installed on the valve body 1. Then, the four pressure head pieces cut from the pressure head 3 are sequentially inserted into the valve body 1 through the inner hole of the valve seat 2. Since the inner hole D3 of the valve body 1 is larger than the outer diameter of the pressure head 3, the four pressure head pieces can form a pressure head 3 within the inner cavity of the valve body 1, although its size is smaller than the original size of the pressure head 3. Then, the pressure rod 4 is inserted from the end of the valve body 1. The diameter d1 of the pressure rod 4 matches the blind hole 31 d2 of the pressure head 3. Since the size d3 of the pressure head 3 is smaller than the inner hole D2 of the valve seat 2, the pressure head 3 can be manually pressed into the inner hole of the valve seat 2. After the pressure head 3 is pressed into the inner hole of the valve seat 2, the pressure rod 4 is stamped on the stamping machine, which can press the valve seat 2 and the valve body 1 tightly to achieve a seal.

[0032] After stamping is completed, remove the pressure rod 4, and then remove the four pressure head pieces one by one from the inner hole of the valve seat 2.

[0033] Example 2: The difference between this example and Example 1 is that:

[0034] In this embodiment, after the pressure head 3 is processed, it is cut into three equally sized pressure head pieces using wire cutting.

[0035] The diameter d1 of the pressure rod 4 is 0.2 mm smaller than the D1 dimension on the valve body 1.

[0036] A frustum torus 32 with an angle a=10° is machined on the outer circle of the pressure head 3.

[0037] Everything else is the same as in Example 1.

[0038] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A stamping punch for the valve body and seat of a high-pressure butt-welded gate valve, characterized in that: The valve seat stamping punch includes a pressure rod (4) for inserting into the inner cavity channel of the valve body (1) and a pressure head (3) located at one end of the pressure rod (4) for pressing the valve seat (2). The diameter of the head end of the pressure head (3) is smaller than the inner diameter of the valve seat (2), and the diameter of the tail end of the pressure head (3) is larger than the inner diameter of the valve seat (2). The pressure rod (4) is located on the side where the tail end of the pressure head (3) is located. The pressure head (3) is equally divided into at least three pressure head pieces. The inner cavity of the valve body (1) includes a first channel (11) and a second channel (12) that are interconnected. The diameter of the first channel (11) is greater than the diameter of the second channel (12). The diameter of the first channel (11) is greater than the diameter of the tail end of the pressure head (3). The length of the first channel (11) is greater than the length of the pressure head (3).

2. The high-pressure butt-welded gate valve body and seat stamping punch according to claim 1, characterized in that: The tail end of the pressure head (3) is provided with a blind hole (31) for the pressure rod (4) to be inserted.

3. The stamping punch for the valve body and seat of a high-pressure butt-welded gate valve according to claim 2, characterized in that: The diameter of the blind hole (31) is equal to the diameter of the pressure bar (4).

4. The stamping punch for the valve body and seat of a high-pressure butt-welded gate valve according to claim 1, characterized in that: The pressure head (3) has a frustum annular surface (32) formed on its circumference. The angle between the generatrix of the frustum annular surface (32) and the central axis is 10° to 12°.

5. The stamping punch for the valve body and seat of a high-pressure butt-welded gate valve according to claim 1, characterized in that: The head of the pressure head (3) is formed with a chamfer of 60°±0.5°.

6. The stamping punch for the valve body and seat of a high-pressure butt-welded gate valve according to claim 1, characterized in that: The diameter of the pressure rod (4) is smaller than the diameter of the second channel (12); the length of the pressure rod (4) is greater than or equal to the length of the inner cavity channel of the valve body (1).

7. The stamping punch for the valve body and seat of a high-pressure butt-welded gate valve according to claim 1, characterized in that: The width and height of each pressure head are smaller than the inner diameter of the valve seat (2).

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