Valve

Abstract

The utility model relates to the field of valves, and provides a valve with a telescopic pipe, which can solve the problem that the valve is damaged in a land subsidence or low-temperature environment in the prior art. The valve comprises a valve body, a telescopic pipe and an outer connector. Wherein a hollow cavity is formed in the valve body, a pipe connector is formed in one side of the valve body, the telescopic pipe is connected to the pipe connector in a sleeving mode and can stretch out and draw back in the axial direction of the pipe connector, and the outer connector is arranged at the end, away from the valve body, of the telescopic pipe. In particular, the telescopic tube comprises at least a flexible section.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve with a telescopic tube. Background Technology

[0002] A pipeline is a device used to transport gases, liquids, or fluids containing solid particles. A pipeline can connect multiple pipeline components, including but not limited to valves, pipes, and adapters. Typically, a valve is connected to a pipeline to control the flow rate of the medium within it. Since both ends of a valve need to be connected to other pipeline components, and the distance between these components is often difficult to ensure perfectly aligns with the valve's axial length, an additional pipeline component is required to ensure proper valve connection.

[0003] In response to this, existing technologies can connect a telescopic tube to the valve's pipe interface. This telescopic tube can extend and retract along the axial direction of the pipe interface within a certain range. This allows the expansion and contraction of the telescopic tube at the valve's pipe interface to compensate for the portion of the pipeline components at both ends of the valve that exceeds the length of the valve body, eliminating the need for additional pipeline components. This also makes the valve suitable for more complex installation scenarios.

[0004] However, when the ground where the pipeline is located settles or shifts, the pipeline components installed on that ground also shift, creating a height difference between them and other pipeline components. In some specific cases, the height difference between the two ends of a valve with a telescopic pipe can often cause the valve to deform or even break. Furthermore, in low-temperature environments such as winter, the telescopic pipe may freeze and crack. Utility Model Content

[0005] This utility model provides a valve with a telescopic tube, which aims to overcome the problem of damage caused by ground subsidence or low temperature environment in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A valve includes a valve body, a telescopic tube, and an external connector. The valve body has a hollow cavity inside, and a pipe interface is provided on one side of the valve body. The telescopic tube is fitted onto the pipe interface and is axially expandable and contractible along the pipe interface. The external connector is located at the end of the telescopic tube furthest from the valve body. Specifically, the telescopic tube includes at least a flexible section.

[0008] As an optional technical solution of this utility model, the end of the telescopic tube near the valve body is a straight pipe section, and the straight pipe section is telescopically and limitably connected to the pipe interface, while the end of the telescopic tube near the external connector is a flexible section.

[0009] This technical solution allows for a retractable and limited connection between the straight pipe section and the pipe interface. During expansion and contraction, the straight pipe section acts as a guide rod, ensuring the expansion pipe can move axially along the valve body. The flexible section on the external connector side provides bending allowance for the expansion pipe. This design effectively mitigates height differences between the valve and external piping components caused by installation environment or terrain settlement. The adjacent straight and flexible sections forming the expansion pipe ensure smooth expansion and contraction, and allow it to adapt to more complex installation environments through bending, thus extending its service life.

[0010] As an optional technical solution of this utility model, the flexible section is a corrugated pipe section. The corrugated pipe section has high wall strength and is easy to process. The folded wall of the corrugated pipe has bending margin. For some complex terrain and terrain settlement situations, the distance difference between two pipeline components can be eliminated by bending the corrugated pipe section, so that the pipeline components can adapt to installation in more complex environments, improve the service life of the pipeline components, and provide a certain expansion / contraction margin in extremely cold or hot environments. The corrugated pipe section can reduce the risk of pipe bursting through expansion.

[0011] As an optional technical solution of this utility model, the ratio of the length of the corrugated pipe section to the length of the telescopic pipe is 1 / 3-2 / 3. If the length of the corrugated pipe section is too large, it will affect the guiding flexibility of the telescopic pipe; if the length of the corrugated pipe section is too small, it will affect the bending effect of the telescopic pipe. Setting the length of the corrugated pipe section to be within the range of 1 / 3-2 / 3 of the overall length of the telescopic pipe can balance good guiding flexibility and bending effect.

[0012] As an optional technical solution of this utility model, one side edge of the outer connector extends inward to form a bellows limiting flange. The end of the bellows section near the outer connector passes through the bellows limiting flange of the outer connector and forms an external limiting flange protruding from the outer surface of the bellows section. The external limiting flange can engage with the end of the outer connector, thereby realizing the limiting connection between the telescopic pipe and the outer connector and preventing the telescopic head from coming off the outer connector.

[0013] As an optional technical solution of this utility model, the corrugated pipe section and the straight pipe section are integrally formed. By integrally forming the corrugated pipe section and the straight pipe section, the risk of leakage at the connection can be reduced and the overall structural strength of the expansion joint can be improved.

[0014] As an optional technical solution of this utility model, a first welding flange protruding from the outer surface of the bellows section is formed at the end of the bellows section near the valve body, and a second welding flange protruding from the outer surface of the straight pipe section is formed at the end of the straight pipe section away from the valve body. The first welding flange and the second welding flange are welded together. The first welding flange and the second welding flange can increase the contact area between the end of the bellows section and the end of the straight pipe section, thereby improving the reliability of the fixing structure between the two.

[0015] As an optional technical solution of this utility model, the external limiting flange and / or the first welding flange are formed by upsetting the end of the corrugated pipe section. With this technical solution, by utilizing the folding characteristics of the pipe wall of the corrugated pipe section, the welding flange and / or limiting flange can be formed by directly upsetting the multiple annular folded protrusions at the end of the corrugated pipe section. The processing technology is simple and the structure is reliable.

[0016] As an optional technical solution of this utility model, the valve also includes a main body limiting retaining ring. A retaining ring groove is formed on the outer surface of the end of the straight pipe section that extends into the pipe interface. The main body limiting retaining ring is fixed in the retaining ring groove, and a limiting joint is formed at the edge of the pipe interface. The inner diameter of the limiting joint is not less than the outer diameter of the straight pipe section, and is less than the outer diameter of the main body limiting retaining ring. With this technical solution, by setting a main body limiting retaining ring on the straight pipe section, the main body limiting retaining ring can be limited and abutted against the pipe interface when the straight pipe section is stretched to a certain extent, preventing it from directly dislodging.

[0017] As an optional technical solution of this utility model, the valve also includes a sealing element and a rigid baffle. The rigid baffle is disposed at the port of the pipe interface, and the sealing element is sleeved on the outer surface of the straight pipe section. The sealing element is pressed between the limiting joint and the rigid baffle. Through this method, regardless of the position of the telescopic pipe, the sealing element will remain between the inner surface of the pipe interface and the outer surface of the telescopic pipe, and will not come out, ensuring the sealing reliability between the telescopic pipe and the valve body. Furthermore, since there may be gaps between the main body limiting ring and the inner wall of the pipe interface, and the sealing element is elastic, it may become stuck in the gap between the main body limiting ring and the inner wall of the pipe interface as the telescopic pipe moves, cutting off or coming out and losing its sealing effect. The rigid baffle prevents the sealing element from getting stuck in the gap, ensuring the sealing effect between the telescopic pipe and the pipe interface.

[0018] As an optional technical solution of this utility model, the external connector can be any one of the following: internal thread connector, external thread connector, plug connector, union nut connector, heat fusion connector, or PPR union.

[0019] As an optional technical solution of this utility model, the valve body can be any one of the following: gate valve body, ball valve body, globe valve body, butterfly valve body, filter valve body, and pressure reducing valve body.

[0020] The beneficial effects of this utility model are:

[0021] According to the valve provided by this utility model, compared with the prior art which uses a rigid straight pipe as a telescopic pipe, the telescopic pipe of the valve of this utility model is at least partially formed as a flexible section. When the ground where the pipeline is located experiences settlement and displacement, that is, when a height difference occurs between the two ends of the valve with the telescopic pipe, the flexible section has a compensation function. It can reduce the risk of valve breakage and damage through its own bending deformation. In some extremely cold or hot environments, the flexible section can also reduce the risk of valve bursting through expansion deformation, making the valve suitable for more complex installation environments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a valve provided in the first embodiment of this utility model.

[0023] Figure 2 This is a cross-sectional structural diagram of a valve provided in the first embodiment of this utility model.

[0024] Figure 3 This is a schematic diagram of the structure of the telescopic tube of the valve provided in this embodiment of the utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Valve body; 11-Valve cavity; 12-Pipe interface; 13-Limit connector;

[0027] 2-External connector;

[0028] 3-Expansion joint; 30-Flexible section; 31-Corrugated section; 311-External limiting flange; 312-First welding flange;

[0029] 32 - Straight pipe section; 321 - Second welding flange;

[0030] 4-Main body limiting retaining ring; 5-Sealing element; 6-Rigid baffle. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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" and "second" are only used for distinction in description and have no special meaning.

[0035] First Embodiment

[0036] Figure 1 This is a schematic diagram of the overall structure of a valve provided in the first embodiment of this utility model. Figure 2 This is a cross-sectional structural diagram of a valve provided in the first embodiment of this utility model. Combined with... Figure 1 and Figure 2 As can be seen, the valve provided in this embodiment includes a valve body 1, a telescopic pipe 3, and an external connector 2. One end of the telescopic pipe 3 is connected to the valve body 1, and the other end is connected to the external connector 2.

[0037] The valve body 1 has a hollow cavity inside, and a pipe interface 12 is provided on one side of the valve body 1. The hollow cavity inside the valve body 1 is the valve chamber 11, which can contain the medium. The medium can enter the valve chamber 11 through the inlet of the valve body 1 and then flow out through the outlet. The pipe interface 12 can be provided at the inlet and / or outlet of the valve body 1. The attached figure illustrates the case where the valve body 1 is formed as a ball valve, but the present invention is not limited to this. The valve body 1 can be the main body of any type of valve, for example, it can be any one of the following: gate valve body, ball valve body, butterfly valve body, filter valve body, pressure reducing valve body. The above-mentioned technical solutions for simple replacement of the structure of the valve body 1 are all within the protection scope of the present invention.

[0038] External connector 2 is used to connect to external piping components and can be selected to match the interface structure of the external piping components; there are no limitations on this. For example, external connector 2 can be any of the following: internal thread connector, external thread connector, plug connector, union nut connector, heat fusion connector, or PPR union. The attached figure illustrates an example where external connector 2 is formed as a union nut. On the one hand, threaded connections are commonly used in the connection of piping components and can be applied to common piping connection scenarios. On the other hand, the union nut allows for connection and fixation to the external piping without rotating the telescopic tube 3 and the valve body 1, making valve assembly and disassembly more convenient.

[0039] One end of the telescopic tube 3 is sleeved on the pipe interface 12 and can extend and retract along the axial direction of the pipe interface 12. The telescopic tube 3 can be sleeved on the outer surface of the pipe interface 12, or the pipe interface 12 can be sleeved on the outer surface of the telescopic tube 3. Here, the example of the pipe interface 12 being sleeved on the outer surface of the telescopic tube 3 is used for illustration. The other end of the telescopic tube 3 (the end away from the valve body 1) is connected to an external connector 2. The material of the telescopic tube 3 is not limited here. Those skilled in the art can freely choose to use a telescopic tube 3 made of copper, stainless steel, or plastic according to their needs. In particular, in this embodiment, the telescopic tube 3 includes at least a flexible section 30. The flexible section 30 refers to a pipe section made of flexible material or a pipe section with flexible performance due to its structure. The flexible section 30 has good plasticity and deformation performance and can deform under external force. Because the flexible section 30 has good elasticity and large deformation capacity, it can deform under external force without easily breaking. Therefore, when the pipeline where the valve is located experiences terrain subsidence, the bending of the flexible section 30 of the telescopic pipe 3 can eliminate the height difference and reduce the risk of valve damage.

[0040] It should be noted that the structure of the flexible segment 30 is not limited in this embodiment. Those skilled in the art will understand that the flexible segment 30 can be any pipe segment made of flexible material or flexible structure. For example, in some embodiments, the flexible segment 30 can be a pipe segment made of elastic rubber, which achieves flexible bending of the pipe by means of the elasticity of the rubber material itself. Alternatively, in other embodiments, the flexible segment 30 can also be a corrugated pipe, which achieves flexible bending of the pipe by means of the corrugated structure.

[0041] The telescopic pipe 3 can be composed of a straight pipe section 32 and a flexible section 30. The straight pipe section 32 refers to a commonly used rigid straight pipe with high strength, which generally does not undergo significant bending deformation. The combination of the straight pipe section 32 and the flexible section 30 is not limited here. Optionally, the end of the telescopic pipe 3 closest to the valve body 1 is the straight pipe section 32, and the straight pipe section 32 is telescopically and limitably connected to the pipe interface 12. Thus, when the telescopic pipe 3 extends or retracts, the straight pipe section 32 can act as a guide rod to ensure that the telescopic pipe 3 can move axially along the valve body 1. The flexible section 30 located on the side of the external connector 2 can provide bending allowance for the telescopic pipe 3. This arrangement can better eliminate the height difference between the valve and external pipeline components caused by installation environment or terrain settlement. The telescopic pipe 3 composed of the straight pipe section 32 and the flexible section 30 arranged adjacent to each other can not only ensure smooth extension and retraction, but also adapt to more complex installation environments through bending, thereby improving service life.

[0042] Existing valves with telescopic pipes 3 often use rigid straight pipes as the telescopic pipes 3. When the ground where the pipeline is located settles or shifts, i.e., when a height difference occurs between the two ends of the valve with the telescopic pipe 3, the valve with the rigid telescopic pipe may bend and break due to the height difference. In this embodiment, the telescopic pipe 3 of the valve is at least partially formed as a flexible section 30. The flexible section 30 has a compensation function. When the ground where the pipeline is located settles or shifts, the flexible section 30 can reduce the risk of valve breakage and damage through its own bending deformation. In some extremely cold or hot environments, the flexible section 30 can also reduce the risk of valve bursting through expansion deformation, making the valve suitable for more complex installation environments.

[0043] Second Embodiment

[0044] Compared to the first embodiment, the second embodiment of this utility model provides a specific structure of the telescopic tube 3. Other unmentioned structures are the same as or similar to those in the first embodiment, and will not be described in detail here.

[0045] Figure 3 This is a schematic diagram of the telescopic tube of the valve provided in this embodiment. Figure 3As shown, the flexible section 30 adopts a corrugated pipe section 31. A corrugated pipe is a tubular elastic sensitive element formed by connecting foldable corrugated sheets along the folding and expansion direction. It is a pipe with a regular wave-like shape. The corrugated pipe section 31 has high wall strength and is easy to process. The folding of the corrugated pipe wall gives the corrugated pipe section 31 a bending allowance. Therefore, in some complex terrains and terrain settlement situations, the bending of the corrugated pipe section 31 can eliminate the distance difference between two pipeline components, allowing the pipeline components to adapt to installation in more complex environments, improving the service life of the pipeline components, and providing a certain expansion / contraction allowance in extremely cold or hot environments. The corrugated pipe section 31 can reduce the risk of pipe bursting through expansion.

[0046] The ratio of the length of the corrugated pipe section 31 to the length of the straight pipe section 32 is not limited. However, if the length of the corrugated pipe section 31 is too large, it will affect the guiding flexibility of the telescopic pipe 3. If the length of the corrugated pipe section 31 is too small, it will affect the bending effect of the telescopic pipe 3. Therefore, in some optional embodiments, the ratio of the length of the corrugated pipe section 31 to the length of the telescopic pipe 3 can be set in the range of 1 / 3 to 2 / 3, which can balance good guiding flexibility and bending effect.

[0047] One end of the bellows section 31 (the end closest to the valve body 1) is fixed to the straight pipe section 32, and the other end (the end extending into the external connector 2) is formed as an external limiting flange 311 protruding from the outer surface of the bellows section 31. The end edge of the external connector 2 extends inward to form a bellows limiting flange, and the end of the bellows section 31 extends into the bellows limiting flange to form the external limiting flange 311. This enables a limiting connection between the telescopic pipe 3 and the external connector 2, preventing the telescopic head from dislodging from the external connector 2. Furthermore, an annular elastic sealing ring can be fixed inside the external connector 2 to press the outer limiting flange 311 of the bellows section 31 against the bellows limiting flange of the external connector 2, thereby improving the reliability of the sealing and fixing structure of the telescopic pipe 3 and the external connector 2.

[0048] The connection method between the corrugated pipe section 31 and the straight pipe section 32 is not limited. Optionally, the corrugated pipe section 31 and the straight pipe section 32 can be integrally formed. By integrally forming the corrugated pipe section 31 and the straight pipe section 32, the risk of leakage at the connection can be reduced and the overall structural strength of the expansion joint can be improved. Alternatively, in some other optional embodiments, the corrugated pipe section 31 and the straight pipe section 32 can be manufactured separately and connected by welding or other fixing methods.

[0049] Considering that separate manufacturing facilitates processing and welding is a common and mature method for fixing metal pipelines, this embodiment takes the separate manufacturing and welding fixing of the corrugated pipe section 31 and the straight pipe section 32 as an example to further explain the structure of the telescopic pipe 3 in detail. In some optional embodiments, the end of the corrugated pipe section 31 near the valve body 1 has a first welding flange 312 protruding from the outer surface of the corrugated pipe section 31, and the end of the straight pipe section 32 away from the valve body 1 has a second welding flange 321 protruding from the outer surface of the straight pipe section 32. The first welding flange 312 and the second welding flange 321 can increase the contact area between the end of the corrugated pipe section 31 and the end of the straight pipe section 32. Furthermore, the end face of the first welding flange 312 matches the end face of the second welding flange 321, thereby improving the reliability of the fixing structure between the two.

[0050] In addition, considering that the corrugated pipe section 31 is formed by connecting foldable corrugated sheets along the folding and stretching direction, the external limiting flanges 311 and / or the first welding flanges 312 at both ends of the corrugated pipe section 31 can be directly formed by upsetting the ends of the corrugated pipe section 31, which is simple in processing and reliable in structure.

[0051] In this embodiment, a corrugated pipe section 31 is used as the flexible section 30, and the connection method and processing method of the corrugated pipe section 31 and the straight pipe section 32 are described in detail. This allows the telescopic pipe 3 to have both good guiding flexibility and bending effect, and provides a more convenient processing method, while improving the overall reliability of the valve structure.

[0052] Third Embodiment

[0053] Compared to the first or second embodiment, the third embodiment of this utility model provides a connection structure between the telescopic tube 3 and the valve body 1. Other structures not mentioned are the same as or similar to the first or second embodiment, and will not be described in detail here.

[0054] The telescopic pipe 3 is connected to the valve body 1 by means of a straight pipe section 32 and a pipe interface 12, wherein, for example Figure 2 As shown, the straight pipe section 32 is fitted inside the pipe interface 12. The edge of the pipe interface 12 forms a limiting joint 13. The limiting joint 13 can be integrally formed with the pipe interface 12 or it can be a separate detachable component. It is not limited here. The attached figure shows an example in which a nut is fixed to the edge of the pipe interface 12. One end of the nut is tightened to the outer surface of the edge of the pipe interface 12, and the other end protrudes inward from the inner surface of the pipe interface 12. That is, the nut is used as the limiting joint 13. With the setting of the nut, the limiting joint 13 can be easily disassembled, which also facilitates the disassembly and replacement of the telescopic pipe 3.

[0055] Correspondingly, a main body limiting retaining ring 4 is also fitted on the outer surface of the straight pipe section 32. A retaining ring groove is opened on the outer surface of the end of the straight pipe section 32 near the pipe interface 12. The main body limiting retaining ring 4 is fixed in the retaining ring groove and protrudes from the outer surface of the straight pipe section 32. The inner diameter of the limiting joint 13 is not less than the outer diameter of the straight pipe section 32 and is less than the outer diameter of the main body limiting retaining ring 4. This ensures that when the straight pipe section 32 is stretched to a certain extent along the axial direction of the valve body 1, the main body limiting retaining ring 4 can be limited and abutted against the pipe interface 12, and will not directly fall out.

[0056] Furthermore, the inner diameter of the pipe interface 12 can be larger than the outer diameter of the straight pipe section 32, so that there is a gap between the inner surface of the pipe interface 12 and the straight pipe section 32, which can avoid frictional damage between the telescopic pipe 3 and the inner wall of the pipe interface 12 during the telescopic process.

[0057] Optionally, the valve may further include a sealing element 5, which is fitted onto the outer surface of the straight pipe section 32. The thickness of the sealing element 5 is greater than that of the inner surface of the pipe interface 12, and there is a gap between the sealing element 5 and the straight pipe section 32. This allows the sealing element 5 to be pressed between the pipe interface 12 and the straight pipe section 32. Since the sealing element 5 is positioned between the limiting joint 13 and the main body limiting ring 4, the sealing element 5 will be axially limited by the limiting joint 13 and the main body limiting ring 4, preventing it from dislodging regardless of the position of the telescopic pipe 3, thus ensuring the sealing reliability between the telescopic pipe 3 and the valve body 1. Furthermore, if the limiting joint 13 is a nut, a sealing groove can be formed between the edge of the pipe interface 12 and the limiting joint 13. The sealing element 5 is confined within this sealing groove. When the nut is tightened, the sealing element 5 is pressed and confined to this position without moving, further enhancing the sealing effect between the telescopic pipe 3 and the valve body 1.

[0058] Since there may be a gap between the main limiting ring 4 and the inner wall of the pipe interface 12, and the sealing element 5 is elastic, it may get stuck in the gap between the main limiting ring 4 and the inner wall of the pipe interface 12 as the telescopic pipe 3 moves, cutting off or falling out and losing its sealing effect. Therefore, optionally, the valve may also include a rigid baffle 6, which is disposed at the port of the pipe interface 12 and between the main limiting ring 4 and the sealing element 5, so that the sealing element 5 can be pressed between the limiting joint 13 and the rigid baffle 6. The rigid baffle 6 has an abutment plane, which can better prevent the sealing element 5 from entering the gap compared to the curved surface of the main limiting ring 4. Furthermore, the thickness of the rigid baffle 6 can be set to be greater than the distance between the main limiting ring 4 and the inner surface of the pipe interface 12. The rigid baffle 6 can prevent the sealing element 5 from getting stuck in the gap, thus ensuring the sealing effect between the telescopic pipe 3 and the pipe interface 12.

[0059] In this embodiment, when installing the telescopic pipe 3, the sealing element 5, the rigid baffle 6, and the main body limiting ring 4 can be sequentially fitted onto the straight pipe section 32, then the straight pipe section 32 can be inserted into the pipe interface 12, and finally the nut can be screwed in to form the limiting joint 13, thus realizing the quick installation of the telescopic pipe 3 and the valve body 1.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A valve, comprising: A valve body (1) has a hollow cavity inside, and a pipe interface (12) is provided on one side of the valve body (1). A telescopic tube (3) is fitted onto the pipe interface (12) and can extend and retract along the axial direction of the pipe interface (12); an external connector (2) is located at the end of the telescopic tube (3) away from the valve body (1). The telescopic tube (3) is characterized in that it includes at least a flexible section (30).

2. The valve according to claim 1, characterized in that, The end of the telescopic pipe (3) near the valve body (1) is a straight pipe section (32), and the straight pipe section (32) is limitedly connected to the pipe interface (12). The end of the telescopic pipe (3) near the external connector (2) is a flexible section (30).

3. The valve according to claim 2, characterized in that, The flexible section (30) is a corrugated pipe section (31).

4. The valve according to claim 3, characterized in that, The length of the corrugated pipe section (31) is 1 / 3 to 2 / 3 of the length of the telescopic pipe (3).

5. The valve according to claim 3 or 4, characterized in that, One side edge of the external connector (2) extends inward to form a bellows limiting flange. The end of the bellows section (31) near the external connector (2) passes through the bellows limiting flange of the external connector (2) and forms an external limiting flange (311) protruding from the outer surface of the bellows section (31).

6. The valve according to claim 5, characterized in that, The corrugated pipe section (31) and the straight pipe section (32) are integrally formed.

7. The valve according to claim 5, characterized in that, The corrugated pipe section (31) has a first welding flange (312) protruding from the outer surface of the corrugated pipe section (31) at one end near the valve body (1), and the straight pipe section (32) has a second welding flange (321) protruding from the outer surface of the straight pipe section (32) at one end away from the valve body (1). The first welding flange (312) and the second welding flange (321) are welded and fixed.

8. The valve according to claim 7, characterized in that, The external limiting flange (311) and / or the first welding flange (312) are formed by the end upsetting of the corrugated pipe section (31).

9. The valve according to any one of claims 2-4, characterized in that, Also includes: The main body limiting retaining ring (4) has a retaining ring groove on the outer surface of one end of the straight pipe section (32) that extends into the pipe interface (12), and the main body limiting retaining ring (4) is fixed in the retaining ring groove. The edge of the pipe interface (12) forms a limiting joint (13), the inner diameter of the limiting joint (13) is not less than the outer diameter of the straight pipe section (32), and is less than the outer diameter of the main limiting ring (4).

10. The valve according to claim 9, characterized in that, Also includes: A rigid baffle (6) is provided at the port of the pipe interface (12); A sealing element (5) is fitted onto the outer surface of the straight pipe section (32), and the sealing element (5) is pressed between the limiting joint (13) and the rigid baffle (6).

11. The valve according to any one of claims 2-4, characterized in that, The external connector (2) is any one of the following: threaded connector, plug connector, union nut connector, heat fusion connector or PPR union.

12. The valve according to any one of claims 2-4, characterized in that, The valve body (1) can be any one of the following: gate valve body, ball valve body, globe valve body, filter valve body, or pressure reducing valve body.

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