Valve body assembly and one-way valve

Abstract

The valve body assembly comprises a first valve body assembly, the first valve body assembly comprises a first section, a fourth section and a connector, the connector is a red copper pipe, the diameter of the fourth section is larger than that of the first section, the first section is connected with the connector in a welded mode, and the second section is connected with the connector in a welded mode. A first transition section and a second transition section are further arranged between the first section and the fourth section, the first transition section is closer to the connector than the second transition section, the diameter of the first transition section is gradually increased in the direction from the first section to the fourth section, the diameter of the second transition section is gradually increased in the direction from the first section to the fourth section, and the diameter of the second transition section is gradually increased in the direction from the second section to the fourth section. The first section, the fourth section, the first transition section and the second transition section are all made of stainless steel materials, the fourth section, the first transition section and the second transition section are all tubular, and the machining difficulty of the valve body assembly is lowered.

Description

[0001] The application is based on the original utility model patent application No. CN202420742569.4, the application date is April 11, 2024, and the application name is "a one-way valve". TECHNICAL FIELD

[0002] The application relates to the field of refrigeration system pipe forming technology, in particular to a valve body assembly and a one-way valve. BACKGROUND

[0003] In a refrigeration system, for example, a one-way valve, the diameter difference between the joint and the valve port of the valve seat is large, therefore, the valve body needs to be provided with a high necking rate (necking rate = (diameter before necking - diameter after necking) / diameter before necking, the necking rate is generally greater than 40%, even reaching 55%), the valve body in the background technology mainly includes a red copper pipe and a stainless steel pipe, among them, the red copper pipe can easily achieve a high necking rate, but the cost is high, while the cost of the stainless steel pipe is relatively low, but when the necking rate requirement is high, the stainless steel pipe is difficult to process, is easy to crack and has a high scrap rate.

[0004] Therefore, how to reduce the processing difficulty of the stainless steel pipe is a technical problem that needs to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the application is to provide a valve body assembly, which can reduce the processing difficulty of the valve body assembly, improve the product yield and reduce the material cost.

[0006] To solve the above technical problems, the application provides a valve body assembly, which comprises a first valve body assembly, the first valve body assembly comprises a first section, a fourth section and a joint, the joint is a red copper pipe, the diameter of the fourth section is greater than that of the first section, the first section is welded to the joint, and the first section and the fourth section further comprise a first transition section and a second transition section, the first transition section is closer to the joint than the second transition section, the diameter of the first transition section gradually increases from the first section to the fourth section, and the diameter of the second transition section gradually increases to the fourth section, the first section, the fourth section, the first transition section and the second transition section are all made of stainless steel, and the fourth section, the first transition section and the second transition section are all in the shape of a pipe. Through the setting of the two-stage transition section, the processing difficulty of the valve body assembly can be reduced.

[0007] The application also provides a one-way valve, which comprises a valve seat and the above-mentioned valve body assembly, the valve body assembly further comprises a second valve body assembly, the structure of the second valve body assembly is the same as that of the first valve body assembly, and the second valve body assembly is welded and fixed to the valve seat. Since the processing difficulty of the valve body assembly is reduced, the processing difficulty of the one-way valve is also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a schematic view of the internal structure of an embodiment of the one-way valve provided by the embodiments of the present application;

[0009] Figure 2 is a schematic view of the structure of the valve body assembly in the embodiment of the one-way valve provided by the embodiments of the present application; Figure 1

[0010] Figure 3 is a schematic view of the internal structure of another embodiment of the one-way valve provided by the embodiments of the present application;

[0011] Figure 4 is a schematic view of the internal structure of yet another embodiment of the one-way valve provided by the embodiments of the present application;

[0012] Figure 5 is a schematic view of the internal structure of yet another embodiment of the one-way valve provided by the embodiments of the present application;

[0013] Figure 6 is a schematic view of the structure of the valve seat assembly of the one-way valve provided by the embodiments of the present application.

[0014] The accompanying drawings are included to provide a further understanding of the technical solutions of the present application and are Figures 1-6 In the drawings, the reference signs are explained as follows:

[0015] 10 valve body assembly; 20 valve seat assembly, 201 valve seat, 202 annular step structure; 30 joint;

[0016] 1 first valve body assembly, 11 first connecting pipe, 12 second connecting pipe, 13 third connecting pipe, 14 first section, 15 second section, 16 third section, 17 fourth section, 18 fifth section, 19 sixth section, 110 first transition section, 111 second transition section, 112 third transition section;

[0017] 2 second valve body assembly, 21 fourth connecting pipe, 22 fifth connecting pipe, 23 sixth connecting pipe, 24 seventh section, 25 eighth section, 26 ninth section, 27 tenth section, 28 eleventh section, 29 twelfth section, 210 fourth transition section, 211 fifth transition section, 212 sixth transition section. DETAILED DESCRIPTION

[0018] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0019] The "fixing" described below can be welding fixing, such as laser welding fixing.

[0020] The embodiments of the present application provide a one-way valve, such as Figures 1-3 ​As shown, the one-way valve comprises a valve body assembly 10 and a valve seat assembly 20, wherein the valve seat assembly 20 comprises a valve seat 201 fixed with the valve body assembly 10. The valve body assembly 10 is provided with a joint 30 at each end thereof, the valve seat 201 is located at the middle section of the valve body assembly 10 and is fixed with the valve body assembly 10, the diameter of the joint 30 is smaller than the diameter of the valve port of the valve seat 201, and thus the diameter of the middle section of the valve body assembly 10 is larger than the diameter of the end of the valve body assembly 10 connected with the joint 30. The middle section of the valve body assembly 10 refers to the middle position of the valve body assembly 10 located at the two ends thereof, which can be approximately the middle position in the length direction of the valve body assembly 10, but is not strictly the middle position in the length direction of the valve body assembly 10. It should be noted that the position of the valve seat 201 is not strictly limited, as long as the function thereof can be achieved.

[0021] It should be noted that the joints 30 are not necessarily required, but are only a specific example in the embodiments of the present application.

[0022] In this article, the "diameter" refers to the "inner diameter" of the corresponding structure.

[0023] As shown in Figure 1 and Figure 2 , the valve body assembly 10 comprises a first valve body assembly 1 and a second valve body assembly 2, wherein the first valve body assembly 1 is fixedly connected with the valve seat 201, the second valve body assembly 2 is fixedly connected with the valve seat 201, and the first valve body assembly 1 and the second valve body assembly 2 are located on the two sides of the valve seat 201, respectively.

[0024] As shown in Figure 1 and Figure 2 , the first valve body assembly 1 comprises a first connecting pipe 11 and a second connecting pipe 12, both of which are stainless steel pipes and are connected between the valve seat assembly 20 and the joint 30, wherein at least one of the first connecting pipe 11 and the second connecting pipe 12 is a variable-diameter structure, the variable-diameter structure connecting pipe comprises a first section 14 and a second section 15, the second section 15 is closer to the valve seat assembly 20 than the first section 14, and the diameter of the second section 15 is larger than that of the first section 14, that is, the large-diameter section of the variable-diameter pipe is arranged on the side facing the valve seat assembly 20.

[0025] Specifically, the first connecting pipe 11 can be a variable-diameter pipe, the second connecting pipe 12 can also be a variable-diameter pipe, or both the first connecting pipe 11 and the second connecting pipe 12 can be variable-diameter pipes. The first valve body assembly 1 comprises at least two connecting pipes between the valve seat assembly 20 and the joint 30, and at least one of the connecting pipes is a variable-diameter pipe. In this way, the diameter of each connecting pipe can be gradually changed between the valve seat assembly 20 and the joint 30, the diameter difference between the two ends of each connecting pipe is reduced, the necking rate requirement of each connecting pipe is further reduced, and thus the processing difficulty of each connecting pipe is reduced and the product yield is improved.

[0026] As shown in Figure 1 and Figure 2 , the first connecting pipe 11 is a variable diameter pipe, the first connecting pipe 11 comprises a first section 14, a second section 15 and a first transition section 110, the first transition section 110 is a variable diameter structure, the diameter of the first transition section 110 gradually increases from the first section 14 to the second section 15, and the transition connection is realized between the first section 14 and the second section 15.

[0027] The second connecting pipe 12 can be a variable diameter pipe or a straight pipe, as shown in Figures 1-3 , when the second connecting pipe 12 is a variable diameter pipe, the second connecting pipe 12 comprises a third section 16, a fourth section 17 and a second transition section 111, wherein the diameter of the fourth section 17 is greater than that of the third section 16, the fourth section 17 is welded and fixed with the valve seat assembly 2, and the third section 16 is directly or indirectly welded and fixed with the second section 15.

[0028] The second connecting pipe 12 is located on the side close to the valve seat assembly 20, and the first connecting pipe 11 is located on the side close to the joint 30, by arranging two-stage variable diameter pipes between the valve seat assembly 20 and the joint 30, the diameter difference of both ends of each connecting pipe can be further reduced, and the necking rate requirement of each connecting pipe is further reduced, thereby reducing the processing difficulty of each connecting pipe and improving the product yield.

[0029] As shown in Figure 4 , the second connecting pipe 12 can also be a straight pipe, that is, the inner diameter of the second connecting pipe 12 along the length direction is constant, one end of the second connecting pipe 12 is fixedly connected with the valve seat 201, and the other end of the second connecting pipe 12 is directly or indirectly welded and fixed with the second section 15. Specifically, the diameter of the second connecting pipe 12 can be greater than that of the second section 15, the end portion of the second section 15 is sleeved in the second connecting pipe 12, and is welded and fixed by circumferential sealing. In this way, one-stage variable diameter can be realized at the connection between the second section 15 and the second connecting pipe 12. Of course, the end portion of the second connecting pipe 12 can also be butted with the end portion of the second section 15, and they can also be welded and fixed by circumferential sealing.

[0030] Of course, the first connecting pipe 11 can also be a straight pipe, and the second connecting pipe 12 can be a variable diameter structure and comprise the first section 14 and the second section 15.

[0031] As shown in Figure 5 , a third connecting pipe 13 is also communicated and fixed between the first connecting pipe 11 and the second connecting pipe 12, the third connecting pipe 13 can be a variable diameter pipe or a straight pipe, and no specific limitation is made here. When the third connecting pipe 13 is a variable diameter pipe, the diameter difference of both ends of each connecting pipe can be further reduced, and the necking rate requirement of each connecting pipe is further reduced, thereby reducing the processing difficulty of each connecting pipe and improving the product yield.

[0032] As shown in Figure 5 , the third connecting pipe 13 includes a fifth section 18, a sixth section 19 and a third transition section 112, wherein the diameter of the third transition section 112 gradually increases from the fifth section 18 to the sixth section 19, the fifth section 18 is fixedly connected with the second section 15, the sixth section 19 is fixedly connected with the end of the second connecting pipe 12 by welding, and when the second connecting pipe 12 includes a third section 16 and a fourth section 17, the sixth section 19 is fixedly connected with the third section 16 by welding.

[0033] The structure of the second valve body assembly 2 is similar to that of the first valve body assembly 1, and in the embodiments given herein, the first valve body assembly 1 and the second valve body assembly 2 have the same structure, so as to standardize the processing during product production. As shown in Figure 1 and Figure 2 , the second valve body assembly 2 includes a fourth connecting pipe 21 and a fifth connecting pipe 22, wherein the fourth connecting pipe 21 and the fifth connecting pipe 22 are both stainless steel pipes and are communicated between the valve seat assembly 20 and another joint 30, and at least one of the fourth connecting pipe 21 and the fifth connecting pipe 22 is a variable-diameter structure, the connecting pipe of the variable-diameter structure includes a seventh section 24 and an eighth section 25, the eighth section 25 is closer to the valve seat assembly 20 than the seventh section 24, and the diameter of the eighth section 25 is greater than that of the seventh section 24, that is, the large-diameter section of the variable-diameter pipe is arranged on the side closer to the valve seat assembly 20.

[0034] Specifically, the fourth connecting pipe 21 can be a variable-diameter pipe, the fifth connecting pipe 22 can be a variable-diameter pipe, or both the fourth connecting pipe 21 and the fifth connecting pipe 22 can be variable-diameter pipes, and the second valve body assembly 2 includes at least two connecting pipes between the valve seat assembly 20 and the joint 30, and at least one of the connecting pipes is a variable-diameter pipe. In this way, the diameters of the connecting pipes can be gradually changed between the valve seat assembly 20 and the joint 30, the diameter difference between the two ends of each connecting pipe is reduced, the necking rate requirement of each connecting pipe is further reduced, and thus the processing difficulty of each connecting pipe is reduced and the product yield is improved.

[0035] As shown in Figure 1 and Figure 2 , the fourth connecting pipe 21 is a variable-diameter pipe, and the fourth connecting pipe 21 includes a seventh section 24, an eighth section 25 and a fourth transition section 210, the fourth transition section 210 is a variable-diameter structure, the diameter of the fourth transition section 210 gradually increases from the seventh section 24 to the eighth section 25, and the fourth transition section 210 realizes the transition connection between the seventh section 24 and the eighth section 25.

[0036] The fifth connecting pipe 22 can be a variable-diameter pipe or a straight pipe, as shown in Figures 1-3As shown, when the fifth connecting pipe 22 is a reducing pipe, the fifth connecting pipe 22 comprises a ninth segment 26, a tenth segment 27 and a fifth transition segment 211, wherein the diameter of the tenth segment 27 is greater than the diameter of the ninth segment 26, the tenth segment 27 is welded and fixed with the valve seat assembly 2, and the ninth segment 26 is directly or indirectly welded and fixed with the eighth segment 25.

[0037] The fifth connecting pipe 22 is located on the side close to the valve seat assembly 20, and the fourth connecting pipe 21 is located on the side close to the joint 30. By arranging two-stage reducing pipes between the valve seat assembly 20 and the joint 30, the diameter difference between the two ends of each connecting pipe can be further reduced, thereby reducing the necking rate requirement of each connecting pipe, and thus reducing the processing difficulty of each connecting pipe, improving the product yield, and reducing the material cost.

[0038] As shown in the drawings, Figure 4 The fifth connecting pipe 22 can also be a straight pipe, that is, the inner diameter of the fifth connecting pipe 22 along the length direction is constant. One end of the fifth connecting pipe 22 is fixedly connected with the valve seat 201, and the other end of the fifth connecting pipe 22 is directly or indirectly welded and fixed with the eighth segment 25. Specifically, the diameter of the fifth connecting pipe 22 can be greater than the diameter of the eighth segment 25. The end portion of the eighth segment 25 is sleeved in the fifth connecting pipe 22, and is welded and fixed by circumferential sealing. In this way, one-stage reducing can be realized at the connection between the eighth segment 25 and the fifth connecting pipe 22. Of course, the end portion of the fifth connecting pipe 22 can also be butted with the end portion of the eighth segment 25, and they can also be welded and fixed by circumferential sealing.

[0039] Of course, the fourth connecting pipe 21 can also be a straight pipe, and the fifth connecting pipe 22 can be a reducing structure and comprise the seventh segment 24 and the eighth segment 25.

[0040] As shown in the drawings, Figure 5 The sixth connecting pipe 23 is also fixedly connected between the fourth connecting pipe 21 and the fifth connecting pipe 22. The sixth connecting pipe 23 can be a reducing pipe or a straight pipe, and no specific limitation is made herein. When the sixth connecting pipe 23 is a reducing pipe, the diameter difference between the two ends of each connecting pipe can be further reduced, thereby reducing the necking rate requirement of each connecting pipe, and thus reducing the processing difficulty of each connecting pipe, improving the product yield, and reducing the material cost.

[0041] As shown in the drawings, Figure 5 The sixth connecting pipe 23 comprises an eleventh segment 28, a twelfth segment 29 and a sixth transition segment 212, wherein the diameter of the sixth transition segment 212 gradually increases from the eleventh segment 28 to the twelfth segment 29. The eleventh segment 28 is fixedly connected with the eighth segment 25, the twelfth segment 29 is fixedly connected with the end portion of the fifth connecting pipe 22, and when the fifth connecting pipe 22 comprises the ninth segment 26 and the tenth segment 27, the twelfth segment 29 is fixedly connected with the ninth segment 26.

[0042] When the diameter of the valve port of the valve seat 201 and the diameter of the joint 30 are greatly different, if only one connecting pipe is arranged between the valve seat 201 and the joint 30, the necking rate requirement of the connecting pipe is large, at this time, the processing difficulty of the connecting pipe is high, the scrap rate is high, and the material cost is high, and in the embodiment, when two or more connecting pipes are arranged in communication between the valve seat 201 and the joint 30, the gradual diameter change can be realized through each connecting pipe, the diameter difference of the two ends of the connecting pipe in the variable diameter structure is reduced, and then the necking rate requirement of each connecting pipe is reduced, thereby reducing the processing difficulty of each connecting pipe and improving the product yield.

[0043] Specifically, the number of connecting pipes between the joint 30 and the valve seat 201, whether each connecting pipe adopts a variable diameter pipe, the necking rate of each variable diameter pipe, etc. can be set according to the total necking rate requirement of the actual valve body assembly 10 within the inventive concept of the present application, and is not specifically limited here.

[0044] Each connecting pipe, specifically including the first connecting pipe 11, the second connecting pipe 12, the third connecting pipe 13, the fourth connecting pipe 21, the fifth connecting pipe 22 and the sixth connecting pipe 23, is made of a stainless steel pipe, which has a low material cost. Moreover, each connecting pipe is of an integral structure.

[0045] The number and structure of the connecting pipes between the two joints 30 and the valve seat 201 are completely the same, that is, the connecting pipes of the first valve body assembly 1 and the second valve body assembly 2 on both sides of the valve seat 201 are symmetrically arranged, that is, the first connecting pipe 11 and the fourth connecting pipe 21 are symmetrically arranged, the second connecting pipe 12 and the fifth connecting pipe 22 are symmetrically arranged, and the third connecting pipe 13 and the sixth connecting pipe 23 are symmetrically arranged. In this way, the overall structure of the one-way valve can be more regular, and the versatility of each connecting pipe is good.

[0046] Of course, the connecting pipes of the first valve body assembly 1 and the second valve body assembly 2 can also be different, such as two connecting pipes arranged in the first valve body assembly 1 and three connecting pipes arranged in the second valve body assembly 2, which can meet the necking rate requirement between the valve body assembly 10 and the valve seat 201.

[0047] In the embodiment, four or more connecting pipes can be arranged between the joint 30 and the valve seat 201, and when two or three connecting pipes are arranged between the joint 30 and the valve seat 201, the overall structure can be simplified while the processing difficulty is reduced and the product yield is improved.

[0048] In the embodiment, the end portions of the first connecting pipe 11 and the fourth connecting pipe 21 can be fixedly connected to a red copper pipe, which forms the joint 30, or the joint 30 can also be formed by plating on the end portions of the first connecting pipe 11 and the fourth connecting pipe 21, which is not specifically limited here.

[0049] When the joint 30 is formed by a red copper pipe, the joint 30 and the first connecting pipe 11 and the fourth connecting pipe 21 are fixed by lap joint and brazing.

[0050] Taking the connection between the joint 30 and the first connecting pipe 11 as an example, as shown in Figure 1 , Figures 4-6 , the joint 30 is partially located in the first connecting pipe 11 and partially located outside the first connecting pipe 11, and then is fixed by welding along the circumferential direction of the outer wall of the joint 30 and the first connecting pipe 11. In this way, compared with the scheme that the joint 30 is completely embedded in the connecting pipe, the welding operation of the joint 30 and the first connecting pipe 11 is facilitated.

[0051] As shown in Figure 1 , Figures 3-5 , in the embodiment, the valve seat 201 is clamped between the second connecting pipe 12 and the fifth connecting pipe 22 and is fixed by welding. In this way, the structure of the valve seat 201 can be simplified, and the assembly process can be simplified.

[0052] As shown in Figure 6 , annular stepped structures 202 are arranged on both sides of the valve seat 201 in the circumferential direction. Taking the connection between the second connecting pipe 12 and the valve seat 201 as an example, the end of the second connecting pipe 12 is sleeved outside the annular stepped structure 202, and then the second connecting pipe 12 and the valve seat 201 are fixed by welding. The second connecting pipe 12 and the valve seat 201 can be fixed by laser welding or brazing.

[0053] The connection between the adjacent two connecting pipes can be fixed by lap joint and laser welding or brazing, or the adjacent two connecting pipes can be fixed by butt joint and laser welding. Specifically, all the connections can be fixed by lap joint, or all the connections can be fixed by butt joint, or part of the connections can be fixed by lap joint and part of the connections can be fixed by butt joint.

[0054] Taking the fixing mode between the connecting pipes of the first valve body assembly 1 as an example, as shown in Figure 1 and Figure 2 , the end of the second connecting pipe 12 is lap joint with the end of the first connecting pipe 11, that is, the end of the second connecting pipe 12 is sleeved outside the end of the first connecting pipe 11 and is fixed by laser welding or brazing. At this time, the diameter of the end of the second connecting pipe 12 is greater than the diameter of the end of the first connecting pipe 11, as shown in Figure 3 , the end of the second connecting pipe 12 is butt joint with the end of the first connecting pipe 11 and is fixed by laser welding. At this time, the diameter of the end of the second connecting pipe 12 is equal to the diameter of the end of the first connecting pipe 11.

[0055] Similarly, when the third connecting pipe 13 is provided, the third connecting pipe 13 and the first connecting pipe 11, or the third connecting pipe 13 and the second connecting pipe 12 can also be lap-welded or butt-welded.

[0056] Of course, the adjacent two connecting pipes, the connecting pipe and the valve seat 201, and the connecting pipe and the joint 30 can also be fixed by interference fit, and the welding fixation can reduce the processing precision requirement and simplify the installation process.

[0057] Each connecting pipe is an integral structure, and the small-diameter section (such as the first section 14, the third section 16, the fifth section 18, the seventh section 24, the ninth section 26, and the eleventh section 28) and each transition section of the connecting pipe with a variable diameter structure can be a spinning mouth section formed by spinning the mouth, or the large-diameter section (such as the second section 15, the fourth section 17, the sixth section 19, the eighth section 25, the tenth section 27, and the twelfth section 29) can be an expanded mouth section formed by expanding the mouth, and no specific limitation is made herein.

[0058] The above is only the preferred embodiment of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A valve body assembly, characterized in that, The device includes a first valve body assembly, comprising a first section, a fourth section, and a connector. The connector is a copper tube. The diameter of the fourth section is larger than the diameter of the first section. The first section is welded to the connector. Between the first section and the fourth section, there is a first transition section and a second transition section. The first transition section is closer to the connector than the second transition section. The diameter of the first transition section gradually increases from the first section to the fourth section, and the diameter of the second transition section gradually increases from the first section to the fourth section. The first section, the fourth section, the first transition section, and the second transition section are all made of stainless steel and are all tubular.

2. The valve body assembly according to claim 1, characterized in that, It can be used to connect to the valve seat of a one-way valve, and the fourth section is welded and fixed to the valve seat.

3. The valve body assembly according to claim 1, characterized in that, The first valve body assembly includes a first connecting pipe and a second connecting pipe. The first connecting pipe includes a second section, and the second connecting pipe includes a third section. The diameter of the second section is the same as the diameter of the third section. The diameter of the second section is greater than the diameter of the first section, and the diameter of the third section is less than the diameter of the fourth section. The first transition section is located between the first section and the third section, and the second transition section is located between the third section and the fourth section.

4. The valve body assembly according to claim 3, characterized in that, The first connecting pipe includes a second section and a first section, and a first transition section is included between the first section and the second section. The diameter of the first transition section gradually increases from the first section to the second section. The second connecting pipe includes a third section, a fourth section, and a second transition section. The diameter of the fourth section is larger than that of the third section. The diameter of the second transition section gradually increases from the third section to the fourth section. The third section is directly or indirectly welded to the second section.

5. The valve body assembly according to claim 3, characterized in that, The first connecting pipe includes a second section and a first section, and a first transition section is included between the first section and the second section. The diameter of the first transition section gradually increases from the first section to the second section. The second connecting pipe includes a third section, the fourth section, and a second transition section. The diameter of the fourth section is larger than that of the third section. The diameter of the second transition section gradually increases from the third section to the fourth section. The third section is directly or indirectly welded to the second section, and the fourth section is welded to the valve seat of the one-way valve.

6. The valve body assembly according to claim 3, characterized in that, The first valve body assembly further includes a third connecting pipe, which includes a fifth section, a sixth section, and a third transition section. The diameter of the third transition section gradually increases from the fifth section to the sixth section. The fifth section is fixedly connected to the second section, and the sixth section is fixedly connected to the third section.

7. The valve body assembly according to any one of claims 1-3, characterized in that, The valve body assembly further includes a second valve body assembly, which includes a fourth connecting pipe and a fifth connecting pipe. At least one of the fourth connecting pipe and the fifth connecting pipe includes a seventh segment and an eighth segment. A fourth transition segment is included between the seventh segment and the eighth segment. The diameter of the eighth segment is larger than the diameter of the seventh segment. The diameter of the fourth transition segment gradually increases from the seventh segment to the eighth segment.

8. The valve body assembly according to claim 7, characterized in that, The fifth connecting pipe includes a ninth section, a tenth section, and a fifth transition section. The diameter of the tenth section is larger than that of the ninth section. The diameter of the fifth transition section gradually increases from the ninth section to the tenth section. The ninth section is directly or indirectly welded to the eighth section.

9. A one-way valve, characterized in that, The valve assembly includes a valve seat and a valve body assembly as described in any one of claims 1-8. The valve body assembly further includes a second valve body assembly, which has the same structure as the first valve body assembly and is welded and fixed to the valve seat.

10. The one-way valve according to claim 9, characterized in that, The valve seat has annular step structures on both sides along the circumference, and the first valve body assembly and the second valve body assembly are welded and fixed to the annular steps respectively.

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