A stop valve

Abstract

The application discloses a stop valve which comprises a valve body assembly, a sleeve assembly and a valve rod assembly, the sleeve assembly comprises a sleeve part, a threaded part and an adapter part, the threaded part is at least partially embedded in the sleeve part, the adapter part is located on the outer circumferential side of the sleeve part, the adapter part comprises a first connecting part and a second connecting part, the first connecting part is fixedly connected with the outer wall of the sleeve part, the second connecting part is fixedly connected with the first valve body, at least part of the sleeve part is located in the valve body, the valve rod assembly comprises a rod part, the rod part is inserted into the sleeve part, the rod part is threadedly connected with the threaded part, and the part of the threaded part embedded in the sleeve part at least partially coincides with the first connecting part. Thus, based on the structure of the internal and external overlapping stacking, the load bearing capacity of the stress area corresponding to the assembly position of the threaded part and the sleeve part can be improved, and deformation of the sleeve part under stress can be avoided. In this way, the problem of rod part jamming caused by sleeve deformation can be avoided, and the stable and reliable valve function can be effectively ensured.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and specifically to a shut-off valve. Background Technology

[0002] Gate valves are commonly used in air conditioning systems to control the flow path. A typical gate valve includes a valve body, a valve block assembly, and a valve stem. The valve stem and valve block assembly are connected by riveting. The valve body has a valve port and an internal threaded portion. A sealing gasket is provided on the valve block assembly for sealing the valve port. The valve stem has an external threaded portion that mates with the internal threaded portion. Through the threaded engagement, the valve stem can approach or move away from the valve port to open or close the flow passage. The internal threaded portion is located at the end of the sleeve assembly that extends into the valve body. When the valve stem rotates relative to the internal threaded portion, the sleeve will bear the stress; thin-walled tubes are prone to deformation. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a shut-off valve that, through structural optimization of the sleeve assembly, reasonably controls the possibility of sleeve deformation.

[0004] This invention provides a shut-off valve, comprising a valve body assembly, a sleeve assembly, and a valve stem assembly. The valve body assembly includes a first valve body. The sleeve assembly includes a sleeve portion, a threaded component, and an adapter portion. At least a portion of the threaded component is embedded and fixed within the sleeve portion. The adapter portion is located on the outer periphery of the sleeve portion and includes a first connecting portion and a second connecting portion. The first connecting portion is fixedly connected to the outer wall of the sleeve portion, and the second connecting portion is fixedly connected to the first valve body. At least a portion of the sleeve portion is located within the first valve body. The valve stem assembly includes a stem portion inserted into the sleeve portion. A first sealing component is provided between the stem portion and the sleeve portion. The stem portion is threadedly engaged with the threaded component. The stem portion is defined to have a cross-section through which its axis passes. The projection of the portion of the threaded component embedded within the sleeve portion onto this cross-section at least partially overlaps with the projection of the first connecting portion onto this cross-section.

[0005] The threaded component and sleeve section of this design consist of a threaded component, a sleeve section, and a first connecting section, arranged from the inside out. When the rod section acts on the threaded component, the overlapping and stacked structure enhances the load-bearing capacity of the stress-bearing area corresponding to the assembly position of the threaded component and sleeve section, significantly reducing deformation of the sleeve section under stress. This reduces the risk of rod jamming due to sleeve deformation, effectively ensuring stable and reliable valve function. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of a shut-off valve provided by the present invention;

[0007] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the shut-off valve in its closed state.

[0008] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the shut-off valve in its open state.

[0009] Figure 4 for Figure 2 A schematic diagram of the structure of the first valve body shown in the figure;

[0010] Figure 5 for Figure 2 A schematic diagram showing the assembly relationship of the sleeve, threaded parts, and adapter.

[0011] Figure 6 for Figure 2 A schematic diagram showing the assembly relationship of the sleeve, threaded parts, adapter, and valve stem assembly;

[0012] Figure 7 for Figure 2 The diagram shows the structure of the rod.

[0013] In the picture:

[0014] 10. Shut-off valve, 1. First valve body, 11. First interface, 12. Second interface, 13. Third interface, 14. Fourth interface, 2. Sleeve assembly, 2. Sleeve, 21. Threaded part, 22. Adapter, 23. First connection, 231. Second connection, 232. Transition connection, 233. Adapter cylinder, 24. First seal, 25. Valve stem assembly, 3. Stem, 31. Body section, 311. Mounting groove, 3111. Neck section, 312. Connector, 313. Valve block, 321. Valve body, 321. Chamfered part, 3211. Mounting cylinder, 322. Stop, 3221. Valve seat, 4. Valve port passage, 41. First connecting pipe, 5. Second connecting pipe, 6. First valve cap, 7. Mounting plate, 8. Filling end, 9. Second valve body, 91. Second valve cap, 92. Valve core, 93. Detailed Implementation

[0015] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Please see Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of the structure of a shut-off valve provided by the present invention. Figure 2 for Figure 1 A cross-sectional schematic diagram.

[0017] like Figure 1 and Figure 2As shown, the shut-off valve 10 includes a first valve body 1, a sleeve assembly 2, a valve stem assembly 3, a valve seat 4, a first connecting pipe 5, a second connecting pipe 6, a first valve cap 7, a mounting plate 8, and a filling end 9.

[0018] The first valve body 1 is the main structure of the shut-off valve and provides a mounting base for other components. In this embodiment of the invention, the first valve body 1 is made of metal and is tubular, meaning it can be a metal tube. This simplifies the processing and acquisition of the first valve body 1. Specifically, the first valve body 1 can be an integrally drawn and formed tube structure. The specific material of the first valve body 1 is not limited here. In practical applications, those skilled in the art can select the appropriate material according to specific needs, as long as it meets the requirements of use.

[0019] For example, the first valve body 1 can be made of stainless steel to reduce the possibility of corrosion during use and to ensure the structural strength of the first valve body 1. Compared with the brass material used in traditional valve bodies, the stainless steel first valve body 1 is also conducive to reducing costs.

[0020] Please see also Figure 4 The image is Figure 2 The diagram shows the structure of the first valve body.

[0021] Combination Figure 2 , Figure 3 and Figure 4 As shown, the peripheral wall of the first valve body 1 may be provided with a first interface portion 11, which may be formed by a drawing process. The first connecting pipe 5 may be installed on the first interface portion 11, and the specific installation process may be welding, such as furnace welding; of course, the first connecting pipe 5 and the first interface portion 11 may also be fixed by other connection methods, such as interference fit, threaded connection, etc., as long as the requirements of use can be met.

[0022] The peripheral wall of the first valve body 1 may also be provided with a second interface portion 12, which may also be formed by a drawing process. Figure 4 In this implementation, the second interface portion 12 and the first interface portion 11 can be arranged opposite to each other, meaning the centerline of the second interface portion 12 and the centerline of the first interface portion 11 can be approximately parallel. In other possible implementations, the centerline of the second interface portion 12 can also be set at an angle to the centerline of the first interface portion 11 (not shown in the figure), and the specific arrangement can be determined according to the overall product design requirements. This application does not limit the scope of the implementation.

[0023] In this embodiment, the second interface portion 12 is used to install the filling end 9. The filling end 9 may include a second valve body 91. The filling end 9 can be connected to the second interface portion 12 through the second valve body 91, and the specific connection methods include, but are not limited to, welding, interference fit, threaded connection, etc. Taking welding as an example, the first connecting pipe 5, the second valve body 91 and the first valve body 1 can be welded simultaneously. For example, these three components can be assembled together first, and then furnace welded simultaneously to improve welding efficiency. Of course, these three components can also be welded in pairs, depending on actual needs.

[0024] The charging end 9 may further include a second valve cap 92 and a valve core 93. The valve core 93 may be disposed inside the second valve body 91. The second valve cap 92 may be installed on the second valve body 91 to cover the valve core 93. Specifically, the second valve cap 92 and the second valve body 91 may be connected by a detachable connection method, such as snap-fit ​​or threaded connection, so that the second valve cap 92 can be easily removed to expose the valve core 93, thereby facilitating the charging of refrigerant into the shut-off valve through the valve core 93.

[0025] The lower end of the first valve body 1 can be referred to as the third interface section 13. The third interface section 13 can be used to install the second connecting pipe 6. The specific installation method can be welding, interference fit, threaded connection, etc. Taking welding as an example, the first connecting pipe 5, the second connecting pipe 6, the second valve body 91 and the first valve body 1 can be welded simultaneously. For example, these four components can be assembled together first, and then furnace welded simultaneously to improve welding efficiency. Of course, these four components can also be welded in pairs, depending on the actual needs.

[0026] The second connecting pipe 6 can be directly connected to the first valve body 1 (not shown in the figure). Alternatively, the second connecting pipe 6 can also be indirectly connected to the first valve body 1 through other components. For example... Figure 2 and Figure 3 As shown, a valve seat 4 is also installed inside the first valve body 1, and the second connecting pipe 6 can be connected to the valve seat 4. In specific implementations, the first valve body 1 and the valve seat 4, as well as the second connecting pipe 6 and the valve seat 4, can be connected by welding. The valve seat 4 can also be provided with a valve port channel 41, which can connect the inner cavity of the first valve body 1 and the second connecting pipe 6.

[0027] In this embodiment, the mounting plate 8 can be installed at the lower end of the first valve body 1, and the specific installation method can be welding, etc. In this embodiment of the invention, the mounting plate 8, the first valve body 1, and the second valve body 91 can form a valve body assembly. In practical applications, the first valve body 1, the second valve body 91, the first connecting pipe 5, the valve seat 4, the second connecting pipe 6, and the mounting plate 8 can all be welded simultaneously to ensure assembly efficiency.

[0028] The upper end of the first valve body 1 can be a fourth interface portion 14, which can be used to install the sleeve assembly 2. Figure 5 and Figure 6 As shown, where, Figure 6 for Figure 2 The diagram shows the assembly relationship of the sleeve, threaded parts, adapter, and valve stem assembly.

[0029] The sleeve assembly 2 includes a sleeve portion 21. The sleeve portion 21 is installed in the first valve body 1, and at least a portion of the sleeve portion 21 is located within the first valve body 1. The valve stem assembly 3 includes a stem portion 31, which is inserted into the sleeve portion 21, and a first sealing element 25 is provided between the stem portion 31 and the sleeve portion 21. In a specific implementation, the first sealing element 25 can be an elastic sealing element made of a material with a certain degree of flexible deformation capability, such as rubber. The specific element can be selected as needed, and this application embodiment does not limit its use.

[0030] Based on the sleeve portion 21, the rod portion 31 can directly cooperate with the sleeve portion 21 to achieve a seal. In this way, the radial dimension of the rod portion 31 can be significantly reduced, which can effectively reduce material costs. In addition, the sleeve portion 21 can also serve as a guide component for the rod portion 31, which can guide the displacement of the rod portion 31 and help improve the stability of the rod portion 31 during displacement.

[0031] The sleeve assembly 2 also includes a threaded component 22, which has an inner hole with at least a partial area having an internal thread. At least a partial portion of the rod 31 may have an external thread. The internal and external threads can be matched to achieve threaded assembly of the rod 31 and the threaded component 22. In practical applications, the threaded component 22 is a fixed component. By applying a rotational driving force to the rod 31, the rod 31 can be driven to rotate relative to the threaded component 22, and simultaneously, the rod 31 can be driven to move axially, thereby achieving axial displacement of the valve stem assembly 3 to cooperate with the valve seat 4, thus realizing valve opening or closing.

[0032] Specifically, the threaded part 22 can be located on the side of the sleeve portion 21 near the valve seat 4. In this way, the threaded part 22 is positioned relatively closer to the valve seat 4, resulting in a shorter stroke during the movement of the valve stem assembly 3 towards the valve seat 4. This reduces the risk of the stem portion 31 shifting relative to the threaded part 22 and potentially jamming. In other words, this design effectively improves the stability of the valve stem assembly 3 during movement.

[0033] like Figure 3 As shown, along the axial direction of the first connector 5, the projection of the threaded member 22 can at least partially fall within the space enclosed by the first interface portion 11. (Refer to...) Figure 3 The orientation and positional relationship, that is, the lower end face of the threaded part 22 can be lower than the upper edge of the inner hole of the first interface part 11, is set as A, where A>0. In this way, the threaded part 22 can be relatively close to the valve seat 4, thereby effectively reducing the travel of the rod part 31.

[0034] The sleeve assembly 2 may also include an adapter 23, on which the sleeve part 21 may be installed. The adapter 23 may be fixedly connected to the first valve body 1, thereby enabling an indirect connection between the sleeve part 21 and the first valve body 1.

[0035] To avoid deformation of the casing under stress, such as Figure 5 As shown, the threaded part 22 can be fitted into the sleeve part 21, for example, but not limited to, by welding to fix the threaded part 22 on the sleeve part 21. Meanwhile, the adapter part 23 may include a first connecting part 231, a second connecting part 232, and a transition connecting part 233. The diameter of the second connecting part 232 is larger than the diameter of the first connecting part 231. Both the first connecting part 231 and the second connecting part 232 extend axially. The outer end of the transition connecting part 233 is connected to the bottom end of the second connecting part 232, and the inner end of the transition connecting part 233 is connected to the top end of the first connecting part 231.

[0036] The second connecting portion 232 is connected to the inner wall of the fourth interface portion 14 of the first valve body 1, and the first connecting portion 231 is connected to the outer wall of the sleeve portion 21. The rod portion 31 is defined with a cross-section through which its axis passes. The projection of the portion of the threaded member 22 embedded in the sleeve portion 21 onto this cross-section at least partially overlaps with the projection of the first connecting portion 231 onto this cross-section. That is, radially, the portion of the threaded member 22 embedded in the sleeve portion 21 at least partially overlaps with the first connecting portion 231. The distance between the upper end face of the threaded member 22 and the lower edge of the first connecting portion 231 is set to B, where B > 0. In other words, from the inside out, the sequence is threaded member 22, sleeve portion 21, and first connecting portion 231. This improves the load-bearing capacity of the stress-bearing area of ​​the sleeve portion 21 and prevents deformation under stress. This avoids the problem of the rod portion 31 jamming due to sleeve deformation, ensuring stable and reliable valve function.

[0037] In this embodiment, the transition portion 23 is a thin-walled structure formed by sequentially connecting the second connecting portion 232, the transition connecting portion 233, and the first connecting portion 231. For example, but not limited to, it can be a stainless steel stamped part, resulting in relatively low material and manufacturing costs. The transition connecting portion 233 is inclined, with its inner end higher than its outer end, to improve the overall load-bearing capacity of the transition portion 23. In other specific implementations, the inclined transition connecting portion 233 may also have its outer end higher than its inner end. Of course, in other possible implementations, the transition connecting portion 233 may also be approximately horizontal.

[0038] In a specific implementation, the sleeve portion 21 can be inserted into the inner hole of the first connecting portion 231 of the adapter portion 23, and the first connecting portion 231 and the outer wall of the sleeve portion 21 can be connected to the adapter portion 23 by welding or other means. The adapter portion 23 can be inserted into the fourth interface portion 14 of the first valve body 1, and the second connecting portion 232 and the inner wall of the fourth interface portion 14 can also be assembled and fixed by welding.

[0039] In practice, the sleeve part 21, the threaded part 22 and the adapter part 23 can be assembled first, and then furnace welding can be carried out simultaneously so that the three can be connected at the same time, which can greatly improve the processing and forming efficiency of the sleeve assembly 2.

[0040] The aforementioned sleeve portion 21 and adapter portion 23 are separate structures. During actual assembly, the adapter portion 23 needs to be installed on the sleeve portion 21 first, and then fixed to the first valve body 1 through the adapter portion 23. In other possible implementations, the sleeve portion 21 and adapter portion 23 can also be set as an integrated structure to simplify the installation process.

[0041] The sleeve assembly 2 may also include an adapter sleeve 24, which can be installed on the end of the sleeve portion 21 away from the valve seat 4, and the specific installation method may be welding, etc. The gate valve may also include a first valve cap 7, which is detachably installed on the adapter sleeve 24 for sealing the side of the sleeve portion 21 away from the valve seat 4.

[0042] It is understandable that the sleeve portion 21 is a tubular component with a relatively limited thickness. Directly machining detachable connection structures, such as threads or snaps, onto it could cause unnecessary damage and affect its service life. By adopting the solution of this embodiment, installing an adapter sleeve 24 on the sleeve portion 21 and then connecting the adapter sleeve 24 to the first valve cap 7 effectively avoids a series of problems caused by directly creating a detachable connection structure on the sleeve portion 21. This ensures the service life of the sleeve portion 21 and facilitates the installation of the first valve cap 7. Overall, it has good manufacturability.

[0043] It should be noted that the specific connection method between the first valve cap 7 and the adapter cylinder 24 is not limited to the structure shown in the figure. In other specific implementations, it can be determined according to actual needs, as long as the requirement of detachability can be met; for example, the first valve cap 7 and the adapter cylinder 24 can be connected by threaded connection, snap-fit, or other methods.

[0044] The first valve cap 7 and the adapter sleeve 24 can be in a connected state or a disconnected state. In the connected state, the first valve cap 7 can seal the sleeve section 21, thereby preventing external dust, moisture, etc. from entering the sleeve section 21 and affecting the normal operation of the rod section 31. In the disconnected state, the first valve cap 7 can release the seal on the sleeve section 21, and the operator can use a wrench or other operating tool to reach into the sleeve section 21 to rotate the rod section 31, thereby adjusting the operating state of the shut-off valve.

[0045] The valve stem assembly 3 may also include a valve block 32, which may be installed at the end of the stem 31 facing the valve seat 4. Specifically, the valve stem assembly 3 may achieve valve closure by the valve block 32 abutting against the valve seat 4.

[0046] Here, the embodiments of the present invention do not limit the connection method between the valve block 32 and the rod 31. In practical applications, those skilled in the art can determine the connection method according to specific needs, as long as it meets the requirements of use. For example, the valve block 32 and the rod 31 can be connected by threaded connection, welding, snap-fit, riveting, or other connection methods.

[0047] In some alternative implementations, the valve block 32 can be configured to rotate relative to the rod 31. With this configuration, when the valve is closed, after the valve block 32 and valve seat 4 come into contact, the valve block 32 will essentially not rotate synchronously with the rod 31 due to the friction between them. During the process of the rod 31 driving the valve block 32 and valve seat 4 to abut against each other, the rotational friction between them is relatively low. Over long-term use, the wear on both the valve block 32 and valve seat 4 can be relatively small, which helps ensure reliable abutment between them and thus guarantees the reliability of the shut-off valve's closure.

[0048] In this embodiment, the valve block 32 may include a valve body 321 and a mounting cylinder 322, with the mounting cylinder 322 located on the side of the valve body 321 facing the stem 31. The mounting cylinder 322 and the valve body 321 may be an integrally formed structure. Alternatively, the mounting cylinder 322 and the valve body 321 may be manufactured separately and then assembled by welding, threaded connection, or other connection methods.

[0049] To further improve the sealing reliability between the valve block and the valve seat 4, the end of the valve body 321 that is adapted to the valve port channel 41 on the valve seat 4 side has a chamfered portion 3211, so as to reliably press against the valve seat 4 side for sealing.

[0050] Please see also Figure 7 The image is Figure 2 The diagram shows the structure of the rod.

[0051] A connector 313 may be provided at one end of the stem 31 near the valve body 321. The connector 313 is configured to be inserted into the mounting cylinder 322, and the outer diameter of the connector 313 may be smaller than the inner diameter of the mounting cylinder 322. Thus, after the connector 313 is inserted into the mounting cylinder 322, the valve block 32 can still rotate relative to the connector 313. For example... Figure 6 As shown, the section of the mounting cylinder 322 that is away from the valve body 321 can be constructed to be bent radially inward by a riveting process to form a stop portion 3221, which can abut against the connector 313 axially. In this way, the valve block 32 and the rod portion 31 are connected by the cooperation of the stop portion 3221, the valve body 321 and the mounting cylinder 322.

[0052] Combination Figure 7The rod portion 31 may further include a body section 311 and a necked section 312. The body section 311 may be provided with the aforementioned external thread for forming a threaded engagement with the threaded component 22; and the body section 311 may also be provided with a mounting groove 3111 for mounting the aforementioned first sealing component 25, thereby achieving a sealed assembly with the sleeve portion 21. The cross-sectional area of ​​the necked section 312 may be smaller than that of the connector 313 and the body section 311, so that the axial end face of the connector 313 facing the body section 311 can form a stepped surface between the connector 313 and the necked section 312, and the stop portion 3221 formed by bending the mounting cylinder 322 can specifically abut against this stepped surface axially.

[0053] The material hardness of valve block 32 can be less than that of valve seat 4. This reduces wear on valve seat 4 and valve body 321, minimizing damage and ensuring sealing performance in the closed state. For example, valve seat 4 can be made of stainless steel to ensure structural strength, while valve block 32 can be made of copper or polytetrafluoroethylene (PTFE) to ensure sealing performance when the second sealing element 323 contacts valve seat 4.

[0054] Based on the aforementioned shut-off valve, the present invention also provides a method for preparing a shut-off valve, applicable to the preparation of shut-off valves involved in the aforementioned implementations, the preparation method comprising the following steps S1 to S7.

[0055] Step S1: Assemble the valve body assembly and valve seat 4, and weld the valve body assembly and valve seat 4.

[0056] The valve body assembly includes the aforementioned first valve body 1, second valve body 91, and mounting plate 8. During welding, the second valve body 91 can be assembled onto the second interface portion 12 of the first valve body 1, and the valve seat 4 and mounting plate 8 can be assembled onto the first valve body 1. Then, the first valve body 1, second valve body 91, mounting plate 8, and valve seat 4 are simultaneously furnace welded to obtain the overall external structure of the shut-off valve.

[0057] In some alternative implementations, step S1 may also include simultaneously assembling the first connecting pipe 5 and the second connecting pipe 6, and simultaneously welding the first connecting pipe 5 and the second connecting pipe 6, thus improving the assembly efficiency of the shut-off valve. Alternatively, the first connecting pipe 5 and the second connecting pipe 6 may be welded separately after step S1 is completed.

[0058] Step S2 involves assembling the sleeve portion 21 and the threaded part 22 in the sleeve assembly 2, and then welding them together. The specific welding process can also be furnace welding, etc. Steps S2 and S1 can be performed simultaneously, or they can be performed sequentially, which is not limited in the embodiments of this application.

[0059] It should be noted that for a scheme where the adapter 23 and the sleeve 21 are separate structures, step S2 can also simultaneously assemble the adapter 23 onto the sleeve 21 and weld the adapter 23 and the sleeve 21 together.

[0060] Step S3: Install the rod 31 onto the sleeve 21, and install the valve block 32 of the valve stem assembly 3 onto the rod 31.

[0061] When the rod 31 is inserted into the sleeve 21, a first sealing element 25 needs to be provided in the mounting groove 3111 of the rod 31 to ensure the sealing performance between the rod 31 and the sleeve 21.

[0062] Step S4: Install the adapter 23 of the sleeve assembly 2 onto the first valve body 1. The specific installation method can be laser welding, etc.

[0063] Step S5 involves welding and assembling the adapter sleeve 24 onto the sleeve portion 21. The specific installation method can also be laser welding, etc. Step S5 can be performed after or before step S4; this embodiment of the application does not impose any limitations on this.

[0064] Step S6: The first valve cap 7 is detachably assembled onto the adapter cylinder 24.

[0065] Step S7: Install the valve core 93 and the second valve cap 92 on the second valve body 91. Step S7 can be performed directly after step S1, or it can be performed after any of the above steps.

[0066] It should be noted that the ordinal numbers used in the above embodiments provided in this implementation method are used to distinguish the same functional components or structures. It should be understood that the application of the above ordinal numbers is only used to distinguish different limited objects and does not constitute a substantial limitation on the shut-off valve claimed in this application.

[0067] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A shut-off valve, characterized in that, The device includes a valve body assembly, a sleeve assembly, and a valve stem assembly. The valve body assembly includes a first valve body. The sleeve assembly includes a sleeve portion, a threaded component, and an adapter portion. At least a portion of the threaded component is embedded and fixed within the sleeve portion. The adapter portion is located on the outer periphery of the sleeve portion and includes a first connecting portion and a second connecting portion. The first connecting portion is fixedly connected to the outer wall of the sleeve portion, and the second connecting portion is fixedly connected to the first valve body. At least a portion of the sleeve portion is located within the first valve body. The valve stem assembly includes a stem portion inserted into the sleeve portion. A first sealing component is provided between the stem portion and the sleeve portion. The stem portion is threadedly engaged with the threaded component. The stem portion is defined to have a cross-section through which its axis passes. The projection of the portion of the threaded component embedded within the sleeve portion onto this cross-section at least partially overlaps with the projection of the first connecting portion onto this cross-section.

2. The shut-off valve according to claim 1, characterized in that, The adapter also includes a transition connection. Both the first connection and the second connection extend axially. The outer end of the transition connection is connected to the bottom end of the second connection, and the inner end of the transition connection is connected to the top end of the first connection.

3. The shut-off valve according to claim 2, characterized in that, The transition connection is inclined, and the inner end of the transition connection is higher than the outer end, or the outer end of the transition connection is higher than the inner end; or, the transition connection is horizontal.

4. The shut-off valve according to any one of claims 1 to 3, characterized in that, The valve stem assembly further includes a valve block, which is mounted on one end of the stem facing the valve seat of the shut-off valve. The valve stem assembly abuts against the valve seat via the valve block, and the material hardness of the valve block is less than that of the valve seat.

5. The shut-off valve according to claim 4, characterized in that, The valve block includes a valve body, and the end of the valve body that is adapted to the valve seat has a chamfered portion.

6. The shut-off valve according to claim 4, characterized in that, The valve seat is made of copper.

7. The shut-off valve according to claim 1, characterized in that, The shut-off valve further includes a valve seat, which forms a valve port passage. The threaded component is located in the first valve body and is installed on the sleeve portion near the valve port passage.

8. The shut-off valve according to claim 7, characterized in that, The shut-off valve further includes a first connecting pipe, and the wall of the first valve body is provided with a first interface portion, and the first connecting pipe is installed on the first interface portion. Along the axial direction of the first connector, the projection of the threaded component falls at least partially within the space enclosed by the first interface portion.

9. The shut-off valve according to claim 7, characterized in that, The sleeve assembly further includes an adapter sleeve installed at the end of the sleeve portion away from the valve seat. The shut-off valve further includes a first valve cap detachably installed on the adapter sleeve for sealing the side of the sleeve portion away from the valve seat.

10. The shut-off valve according to any one of claims 1 to 3, characterized in that, The first valve body is made of stainless steel and is a one-piece stretched pipe structure.

Images