Stop valve and manufacturing method thereof

Abstract

The stop valve comprises a valve body assembly, a threaded piece, a valve seat and a valve rod assembly, the valve body assembly comprises a first valve body, the threaded piece and the valve seat are both installed on the first valve body, a valve port channel is formed in the valve seat, the valve rod assembly comprises a rod part and a core part, and the rod part and the core part are arranged on the valve body. The rod part is in threaded fit with the threaded part, the core part is connected with the end, close to the valve seat, of the rod part in a limiting mode, the core part is configured to rotate relative to the rod part, and the core part is configured to block the valve port channel when making contact with the valve seat. The core part of the valve rod assembly of the stop valve can rotate relative to the rod part, abrasion between the core part and the valve seat during valve closing can be reduced, reliable abutting of the core part and the valve seat can be guaranteed, and then the valve closing reliability of the stop valve can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to a stop valve and a method for manufacturing the stop valve. Background Art

[0002] Stop valves are commonly used in air conditioning systems to open and close the flow path.

[0003] A globe valve consists of a valve body, a valve seat, and a valve stem. The valve seat is mounted on the valve body and forms a valve port. The valve stem has an external threaded portion, and the valve body has an internal threaded portion that matches the external threaded portion. Through the threaded interaction of the internal and external threads, the valve stem can move axially within the inner cavity of the valve body to mate with the valve port of the valve seat, thereby closing or opening the valve port. The valve stem also rotates synchronously with its linear displacement, resulting in significant wear between the valve stem and the valve port, which can affect valve closing reliability over long-term use.

[0004] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects is still a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide a stop valve and a preparation method thereof, wherein the core of the valve stem assembly of the stop valve can rotate relative to the stem, which can reduce the wear between the core and the valve seat when closing the valve, and is conducive to ensuring the reliable tight contact between the core and the valve seat, thereby ensuring the closing reliability of the stop valve.

[0006] In order to solve the above technical problems, the present invention provides a stop valve, including a valve body assembly, a threaded part, a valve seat and a valve stem assembly, the valve body assembly including a first valve body, the threaded part and the valve seat are both installed on the first valve body, the valve seat forms a valve port channel, the valve stem assembly includes a rod portion and a core portion, the rod portion is threadedly engaged with the threaded part, the core portion is limitedly connected to an end portion of the rod portion close to the valve seat, the core portion is configured to be able to rotate relative to the rod portion, and the core portion is configured to be able to block the valve port channel when in contact with the valve seat.

[0007] In the above scheme, the core is configured to be able to rotate relative to the rod. In this way, when closing the valve, after the core and the valve seat come into contact, based on the friction between the core and the valve seat, the core basically will no longer rotate synchronously with the rod. In the process of the rod driving the core and the valve seat to press against each other, the rotational friction between the core and the valve seat is relatively small. During long-term use, the wear of the core and the valve seat can be relatively small, which is conducive to ensuring the reliable pressing of the core and the valve seat, and thus ensuring the valve closing reliability of the stop valve.

[0008] The present invention also provides a method for preparing a stop valve, which is suitable for the above-mentioned stop valve, wherein the stop valve also includes a transition tube and a first valve bonnet, and the preparation method includes at least the following steps: assembling the valve body assembly and the valve seat, and welding the valve body assembly and the valve seat; assembling the sleeve portion, threaded member and transition portion of the sleeve assembly, and welding the sleeve portion, the threaded member and the transition portion; installing the rod portion on the sleeve portion, and installing the core of the valve stem assembly on the rod portion; installing the transition portion of the sleeve assembly on the valve body assembly; welding and assembling the transition tube on the sleeve portion; and detachably assembling the first valve bonnet on the transition tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a structural diagram of an implementation of the stop valve provided by the present invention;

[0010] Figure 2 for Figure 1 sectional view of ;

[0011] Figure 3 A diagram showing the connection structure of the valve body assembly, the sleeve assembly, the valve stem assembly, the first connecting pipe and the second connecting pipe;

[0012] Figure 4 is a structural schematic diagram of the first valve body;

[0013] Figure 5 A diagram showing the connection structure of the sleeve portion, the threaded member, and the adapter portion;

[0014] Figure 6 A diagram showing the connection structure of the sleeve, threaded member, adapter, and valve stem assembly;

[0015] Figure 7 is a structural diagram of the rod;

[0016] Figure 8 A diagram showing the connection structure of the core body, the first mounting tube, and the second mounting tube;

[0017] Figure 9 A diagram showing the connection structure of the core, the first mounting cylinder, the second mounting cylinder, the annular gasket, and the second sealing member;

[0018] Figure 10 for Figure 9 A schematic structural diagram of the first mounting tube after bending;

[0019] Figure 11 This is a structural schematic diagram of the method for preparing the stop valve provided by the present invention.

[0020] The following are the descriptions of the reference numerals:

[0021] 1 first valve body, 11 first interface portion, 12 second interface portion, 13 third interface portion, 14 fourth interface portion;

[0022] 2 casing assembly, 21 casing portion, 22 threaded member, 221 threaded section, 222 sleeve section, 23 adapter portion, 231 insertion section, 232 support section, 24 adapter tube, 25 first sealing member;

[0023] 3 Valve stem assembly, 31 stem, 311 body section, 311a mounting groove, 312 neck section, 313 connector, 32 core, 321 core body, 321a annular groove, 321b countersunk groove, 322 first mounting tube, 322a first stopper, 323 second sealing element, 324 annular gasket, 325 second mounting tube, 325a second stopper;

[0024] 4 valve seats, 41 valve port channels;

[0025] 5. First takeover;

[0026] 6. Second takeover;

[0027] 7 first valve bonnet;

[0028] 8 mounting plate;

[0029] 9 filling end, 91 second valve body, 92 second valve cap, 93 valve core. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In the embodiments of the present invention, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of the features.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0033] In the description of the embodiments of the present invention, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0034] Please refer to Figures 1-10 , Figure 1 This is a structural diagram of an implementation of the stop valve provided by the present invention. Figure 2 for Figure 1 A cross-sectional view of Figure 3 This is a diagram of the connection structure of the valve body assembly, the sleeve assembly, the valve stem assembly, the first connecting pipe and the second connecting pipe. Figure 4 is a structural diagram of the first valve body, Figure 5 This is a diagram of the connection structure of the sleeve, threaded parts and adapter. Figure 6 This is the connection structure diagram of the sleeve part, threaded parts, adapter part and valve stem assembly. Figure 7 is a schematic diagram of the rod structure. Figure 8 This is a diagram showing the connection structure of the core, the first mounting tube, and the second mounting tube. Figure 9 This is a diagram showing the connection structure of the core, the first mounting cylinder, the second mounting cylinder, the annular gasket and the second sealing member. Figure 10 for Figure 9 Schematic diagram of the structure of the first mounting tube after bending.

[0035] like Figure 1 and Figure 2 As shown, the present invention provides a stop valve, including 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.

[0036] The first valve body 1 is the main structure of the stop valve and is used to provide an installation base for other components. In an embodiment of the present invention, the first valve body 1 is made of metal and is tubular, that is, the first valve body 1 can be a metal tube. In this way, the processing and acquisition of the first valve body 1 can be relatively simple; specifically, the first valve body 1 can be a one-piece stretch-molded structure of a pipe. The specific material type of the first valve body 1 is not limited here. In actual applications, those skilled in the art can choose according to specific needs, as long as it can meet the requirements of use; illustratively, the first valve body 1 can be made of stainless steel to reduce the possibility of rust 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 first valve body 1 made of stainless steel is also conducive to reducing costs.

[0037] Combine Figure 4 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 mounted to the first interface portion 11, and the mounting 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 using other connection methods, such as interference fit, threaded connection, etc., as long as they meet the requirements of use.

[0038] The peripheral wall of the first valve body 1 may also be provided with a second interface portion 12, and the second interface portion 12 may also be formed by a drawing process. Figure 4 In the implementation method, the second interface part 12 and the first interface part 11 can be arranged relative to each other, that is, the central axis of the second interface part 12 and the central axis of the first interface part 11 can be roughly parallel; in addition, the central axis of the second interface part 12 can also be arranged to be at an angle to the first interface part 11, which is also feasible.

[0039] The second interface portion 12 is used for mounting the filling end 9 .

[0040] The filling end 9 may include a second valve body 91. The filling end 9 may be connected to the second interface portion 12 via the second valve body 91. Specific connection methods include, but are not limited to, welding, interference fit, and threaded connection. Taking welding as an example, the first connecting pipe 5, the second valve body 91, and the first valve body 1 may be welded simultaneously. For example, these three components may be assembled together and then furnace-welded simultaneously to improve welding efficiency. Alternatively, the three components may be welded separately in pairs, and the specific method may be determined based on actual needs.

[0041] The filling end 9 may further include a second valve cap 92 and a valve core 93. The valve core 93 may be disposed within the second valve body 91. The second valve cap 92 may be mounted on the second valve body 91 to shield the valve core 93. The second valve cap 92 and the second valve body 91 may be connected in a detachable manner, such as a snap-fit ​​or threaded connection. This allows the second valve cap 92 to be easily removed to expose the valve core 93, thereby allowing refrigerant to be easily filled into the shut-off valve through the valve core 93.

[0042] The lower end of the first valve body 1 can be referred to as the third interface portion 13. The third interface portion 13 can be used to mount the second connecting pipe 6. Specific mounting methods can include 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 separately in pairs. The specific method can be determined based on actual needs.

[0043] The second connecting pipe 6 can be directly connected to the first valve body 1 .

[0044] Alternatively, the second connecting pipe 6 can also be indirectly connected to the first valve body 1 through other components. Figure 2 and Figure 3 A valve seat 4 is also mounted within the first valve body 1. The second connecting pipe 6 may be connected to the valve seat 4. The first valve body 1 and the valve seat 4, as well as the second connecting pipe 6 and the valve seat 4, may be connected by welding. The valve seat 4 may also be provided with a valve port channel 41 that connects the inner cavity of the first valve body 1 and the second connecting pipe 6.

[0045] like Figure 2 and Figure 3 As shown, the mounting plate 8 can be mounted on the lower end of the first valve body 1, and the specific mounting method can be welding. In this embodiment of the present invention, the mounting plate 8, the first valve body 1, and the second valve body 91 can be collectively referred to as a valve body assembly. In actual application, 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.

[0046] The upper end of the first valve body 1 can be referred to as a fourth interface portion 14 , and the fourth interface portion 14 can be used to install the sleeve assembly 2 .

[0047] Combine Figure 5 and Figure 6 , 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 part of the sleeve portion 21 is located inside the first valve body 1. The valve stem assembly 3 includes a rod portion 31, and the rod portion 31 is inserted into the sleeve portion 21, and a first sealing member 25 is provided between the rod portion 31 and the sleeve portion 21. In the above scheme, through the provision of the sleeve portion 21, the rod portion 31 can directly cooperate with the sleeve portion 21 to achieve sealing, without the need to cooperate with the first valve body 1 for sealing. In this way, the radial dimension of the rod portion 31 can be greatly reduced, which can effectively reduce the material cost. In addition, the sleeve portion 21 can also serve as a guide component for the rod portion 31, which can also guide the displacement of the rod portion 31, which is beneficial to improving the stability of the rod portion 31 during the displacement process.

[0048] The first sealing member 25 may be an elastic sealing element made of a material having a certain degree of flexible deformation capability, such as rubber.

[0049] The sleeve assembly 2 also includes a threaded member 22 having an inner hole, at least a portion of which is provided with an internal threaded portion. At least a portion of the stem 31 may be provided with an external threaded portion. The internal and external threads may match, thereby enabling threaded assembly of the stem 31 and the threaded member 22. In actual application, the threaded member 22 is a fixed component. By applying a rotational driving force to the stem 31, the stem 31 can be driven to rotate relative to the threaded member 22 and simultaneously driven to axially displace the stem 31, thereby achieving axial displacement of the valve stem assembly 3 so as to cooperate with the valve seat 4 to open or close the valve.

[0050] The threaded member 22 can be specifically disposed on the side of the sleeve portion 21 that is closer to the valve seat 4. This allows the threaded member 22 to be positioned relatively closer to the valve seat 4. This shortens the travel of the valve stem assembly 3 toward the valve seat 4, and reduces the risk of the stem 31 deflecting relative to the threaded member 22 and subsequently becoming stuck. This solution significantly improves the stability of the valve stem assembly 3 during movement.

[0051] In a specific example, Figure 3 As shown, along the axial direction of the first connecting pipe 5, the projection of the screw member 22 can at least partially fall within the space enclosed by the first interface portion 11. Figure 3 The orientation and position relationship in the embodiment of the present invention is that the lower end surface of the threaded member 22 can be lower than the upper edge of the inner hole of the first interface portion 11. The distance between the lower end surface of the threaded member 22 and the upper edge of the inner hole of the first interface portion 11 is set to A, where A>0. In this way, the threaded member 22 can be relatively close to the valve seat 4, thereby effectively reducing the operating stroke of the rod portion 31.

[0052] Still Figure 5 As shown, the threaded member 22 may include a threaded segment 221 and a sleeve segment 222, which may be distributed along the axial direction of the threaded member 22. The threaded segment 221 is provided with the aforementioned internal threaded portion for threaded connection with the rod portion 31; the sleeve segment 222 may be sleeved on the sleeve portion 21, and the sleeve segment 222 may be welded to the sleeve portion 21 to achieve installation and fixation of the threaded member 22 on the sleeve portion 21.

[0053] The sleeve section 222 and the sleeve portion 21 may be sleeved in a manner such as a jacket. Figure 5As shown, under this implementation, the threaded member 22 does not occupy the internal space of the sleeve portion 21, which can reduce the impact on the installation and movement of the rod portion 31 in the sleeve portion 21. In addition, the sleeve segment 222 and the sleeve portion 21 can also adopt an inner sleeve connection method, that is, the sleeve segment 222 can be inserted into the inner side of the sleeve portion 21. In this case, the sleeve segment 222 can also be provided with the aforementioned internal thread portion to form a threaded fit with the rod portion 31, thereby increasing the size of the internal thread portion, which has a positive significance for ensuring the stability of the threaded transmission; of course, the sleeve segment 222 can also be provided with no internal thread portion, and the specific method can be determined according to actual circumstances.

[0054] The sleeve assembly 2 may further include a transition portion 23 , the sleeve portion 21 may be mounted on the transition portion 23 , and the transition portion 23 may be fixedly connected to the first valve body 1 , thereby achieving an indirect connection between the sleeve portion 21 and the first valve body 1 .

[0055] In a specific example, Figure 5 As shown, the adapter portion 23 may include an insertion section 231 and a support section 232. The outer diameter of the support section 232 may be larger than that of the insertion section 231. The insertion section 231 may be inserted into the fourth interface portion 14 and fixedly connected thereto by welding, interference fitting, or the like, while the support section 232 may abut against the first valve body 1 to limit the installation depth of the adapter portion 23 within the fourth interface portion 14. It should be understood that the adapter portion 23 may also be entirely inserted into the fourth interface portion 14, or may be entirely located outside the first valve body 1. These are all feasible solutions.

[0056] The adapter portion 23 may be a ring-shaped plate having an inner hole. The sleeve portion 21 may be inserted into the inner hole of the adapter portion 23 and connected to the adapter portion 23 by welding or other methods. In practice, the sleeve portion 21, the threaded member 22, and the adapter portion 23 may be assembled first, and then furnace welded simultaneously, so that the three can be connected simultaneously, which can greatly improve the processing efficiency of the sleeve assembly 2.

[0057] In the above description, the sleeve portion 21 and the adapter portion 23 are separate structures. During 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 fact, the sleeve portion 21 and the adapter portion 23 can also be configured as an integrated structure, which can further simplify the installation process.

[0058] The sleeve assembly 2 may further include an adapter tube 24, which may be mounted on the end of the sleeve portion 21 facing away from the valve seat 4. The specific mounting method may be welding. The stop valve may further include a first valve cap 7, which is detachably mounted on the adapter tube 24 to seal the end of the sleeve portion 21 facing away from the valve seat 4.

[0059] It should be understood that the sleeve portion 21 is a tubular component with a relatively limited thickness. Directly machining a detachable connection structure, such as a thread or a snap, thereon is relatively difficult and may cause unnecessary damage to the sleeve portion 21, thereby affecting the service life of the sleeve portion 21. However, by adopting the solution of the embodiment of the present invention, by installing an adapter tube 24 on the sleeve portion 21 and then connecting the adapter tube 24 to the first valve bonnet 7, a series of problems caused by directly providing a detachable connection structure on the sleeve portion 21 can be effectively avoided, thereby ensuring the service life of the sleeve portion 21 and conveniently achieving installation of the first valve bonnet 7.

[0060] Here, the embodiment of the present invention does not limit the specific connection method between the first valve bonnet 7 and the adapter tube 24. In actual application, those skilled in the art can determine it according to actual needs, as long as it can meet the requirement of detachability; for example, the first valve bonnet 7 and the adapter tube 24 can be connected by threaded connection, clamping, etc.

[0061] The first valve bonnet 7 and the adapter tube 24 can be in a connected state and a disconnected state. In the connected state, the first valve bonnet 7 seals the sleeve 21, thereby preventing external dust, moisture, etc. from entering the sleeve 21 and thereby affecting the normal operation of the stem 31. In the disconnected state, the first valve bonnet 7 releases the seal on the sleeve 21, allowing a worker to reach into the sleeve 21 with a tool such as a wrench to rotate the stem 31, thereby adjusting the operating state of the stop valve.

[0062] The valve stem assembly 3 may further include a core 32, which may be positionally connected to one end of the stem 31 facing the valve seat 4 to form an axially anti-detachment connection between the core 32 and the stem 31. Specifically, the valve stem assembly 3 may achieve closing of the stop valve by abutting the core 32 against the valve seat 4.

[0063] In an embodiment of the present invention, the core 32 can be configured to rotate relative to the rod 31. With this arrangement, when closing the valve, after the core 32 and the valve seat 4 come into contact, the core 32 will basically no longer rotate synchronously with the rod 31 due to the friction between the core 32 and the valve seat 4. In the process of the rod 31 driving the core 32 and the valve seat 4 to press against each other, the rotational friction between the core 32 and the valve seat 4 is relatively small. During long-term use, the wear of the core 32 and the valve seat 4 can be relatively small, which is conducive to ensuring the reliable pressing between the core 32 and the valve seat 4, and thus ensuring the valve closing reliability of the stop valve.

[0064] Combine Figure 3 、 Figures 8-10 In this embodiment of the present invention, the core portion 32 may include a core body 321 and a first mounting cylinder 322. The first mounting cylinder 322 may be located on the side of the core body 321 facing the rod portion 31. The first mounting cylinder 322 and the core body 321 may be integrally formed into a one-piece structure. Alternatively, the first mounting cylinder 322 and the core body 321 may be prepared separately and then assembled through welding, threaded connection, or other connection methods.

[0065] The end of the rod 31 close to the core 321 may be provided with a connector 313, which is configured to be inserted into the first mounting tube 322, and the outer diameter of the connector 313 may be smaller than the inner diameter of the first mounting tube 322; thus, after the connector 313 is inserted into the first mounting tube 322, the core 32 can still rotate relative to the connector 313. Figure 9 and Figure 10 As shown, the barrel section of the first mounting barrel 322 facing away from the core body 321 can be constructed to be able to be bent radially inward by a riveting process, etc. to form a first stop portion 322a, and the first stop portion 322a can be axially opposed to the connecting head 313; in this way, the connection between the core 32 and the rod portion 31 can be achieved through the cooperation of the first stop portion 322a, the core body 321 and the first mounting barrel 322.

[0066] Combine Figure 7 The rod portion 31 may further include a main body section 311 and a necking section 312. The main body section 311 may be provided with the aforementioned external threaded portion for forming a threaded fit with the threaded member 22; and the main body section 311 may further be provided with a mounting groove 311a for mounting the aforementioned first sealing member 25, thereby achieving a sealed assembly with the sleeve portion 21. The cross-sectional area of ​​the necking section 312 may be smaller than the connector 313 and the main body section 311, so that the axial end face of the connector 313 facing the main body section 31 may form a step surface between the connector 313 and the necking section 312, and the first stop portion 322a formed by the bending of the first mounting cylinder 322 may specifically be in axial contact with the step surface.

[0067] A second sealing member 323 may be installed on the side of the core 321 facing away from the stem 31. Specifically, the core 32 may abut against the valve seat 4 via the second sealing member 323. The second sealing member 323 may have a lower hardness than the core 321 and the valve seat 4. This reduces wear and tear on the valve seat 4 and the core 321, thereby minimizing damage to the valve seat 4 and the core 321. For example, the valve seat 4 and the core 321 may both be made of stainless steel to ensure structural strength. The second sealing member 323 may be made of copper or polytetrafluoroethylene (PTFE) to ensure a good seal between the second sealing member 323 and the valve seat 4.

[0068] Combine Figure 8 The core 321 may be provided with an annular groove 321a, and the second sealing member 323 may be mounted within the annular groove 321a. The bottom wall of the annular groove 321a may be provided with a recessed groove 321b. The recessed groove 321b may be, for example, a V-shaped groove, a U-shaped groove, etc., but is not limited here. When the second sealing member 323 is pressurized, a portion of the second sealing member 323 may be pressed into the recessed groove 321b, thereby increasing the contact area between the second sealing member 323 and the core 321, and thereby improving the sealing reliability between the second sealing member 323 and the core 321.

[0069] The core 32 may further include a second mounting tube 325, which may be located on a side of the core 321 facing away from the rod 31. The second mounting tube 325 and the core 321 may be integrally formed as a one-piece structure. Alternatively, the second mounting tube 325 and the core 321 may be manufactured separately and then assembled via welding, threaded connection, or other connection methods.

[0070] The core 32 may further include an annular gasket 324, which may be mounted on the second mounting tube 325. The section of the second mounting tube 325 facing away from the core body 321 may be configured to be bent radially outward through a riveting process or the like to form a second stopper 325a. The second stopper 325a may be axially abutted against the annular gasket 324 to determine the installation position of the annular gasket 324 in the second mounting tube 325. The annular gasket 324 may also be used to compress the second sealing member 323, thereby achieving the installation and fixation of the second sealing member 323 to the core body 321. It should be noted that the outer diameter of the annular gasket 324 is smaller than the inner diameter of the valve port passage 41. That is, when the core 32 and the valve seat 4 are in contact, the provision of the annular gasket 324 will not affect the sealing of the valve seat 4 by the second sealing member 323.

[0071] It should be understood that the above-described method of deforming the second mounting cylinder 325 by riveting, thereby compressing the annular gasket 324, and compressing the second sealing member 323 via the annular gasket 324, is merely an exemplary embodiment of the present invention and does not limit the scope of implementation of the stop valve provided by the present invention. Other methods may be used to secure the second sealing member 323, provided that the functions are met. For example, the second sealing member 323 may be directly secured by the second stop portion 325a, thereby eliminating the need for the annular gasket 324. Alternatively, the second sealing member 323 may be secured directly by screw connection, bonding, interference fit, or other methods, as long as the reliability of the securement can be guaranteed.

[0072] Please refer to Figure 11 , Figure 11 This is a structural schematic diagram of the method for preparing the stop valve provided by the present invention.

[0073] like Figure 11 As shown, the present invention further provides a method for preparing a stop valve, which is suitable for preparing the stop valve involved in the above-mentioned implementations. The preparation method includes the following steps S1 to S7.

[0074] Step S1 , assembling the valve body assembly and the valve seat 4 , and welding the valve body assembly and the valve seat 4 .

[0075] The valve body assembly includes the aforementioned first valve body 1, the second valve body 91 and the mounting plate 8. During welding, the second valve body 91 can be assembled to the second interface portion 12 of the first valve body 1 first, and the valve seat 4 and the mounting plate 8 can be assembled to the first valve body 1. Then, the first valve body 1, the second valve body 91, the mounting plate 8 and the valve seat 4 can be simultaneously furnace welded to obtain the overall external structure of the stop valve.

[0076] In some optional 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. In this way, the assembly efficiency of the stop valve can be higher. Of course, the first connecting pipe 5 and the second connecting pipe 6 can also be welded separately after step S1 is completed, which is also feasible.

[0077] In step S2, the sleeve portion 21 and the threaded member 22 of the sleeve assembly 2 are assembled and then simultaneously welded. The specific welding process may also be furnace welding. It should be noted that if the sleeve portion 21 and the adapter portion 23 are separate structures, the adapter portion 23 must also be assembled and welded simultaneously in step S2.

[0078] Step S2 and step S1 may be executed simultaneously, or may be executed one after another, which is not explicitly limited here.

[0079] In step S3 , the stem portion 31 is mounted on the sleeve portion 21 , and the core portion 32 of the valve stem assembly 3 is mounted on the stem portion 31 .

[0080] When the rod 31 is inserted into the sleeve 21, a first seal 25 needs to be provided in the mounting groove 311a of the rod 31 to ensure the sealing performance between the rod 31 and the sleeve 21. Before the core 32 is installed on the rod 31, the core 32 must be assembled first. Figure 9 For example, the second sealing member 323 , the annular gasket 324 and the core 321 are assembled first, and then the core 32 is assembled to the rod 31 through the first mounting tube 322 .

[0081] In step S4, the adapter portion 23 of the sleeve assembly 2 is mounted on the first valve body 1. The specific mounting method may be laser welding or the like.

[0082] In step S5, the adapter tube 24 is welded to the sleeve portion 21. The specific installation method may also be laser welding, etc. Step S5 may be performed after step S4 or before step S4, which is not limited here.

[0083] Step S6 , detachably assembling the first valve bonnet 7 to the adapter cylinder 24 .

[0084] In step S7, the valve core 93 and the second valve cap 92 are installed on the second valve body 91. Step S7 can be performed directly after step S1, or after any of the above steps.

[0085] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A stop valve, characterized in that: The valve body assembly comprises a valve body, a threaded part, a valve seat and a valve stem assembly, wherein the valve body assembly comprises a first valve body, the threaded part and the valve seat are both mounted on the first valve body, the valve seat forms a valve port channel, the valve stem assembly comprises a rod portion and a core portion, the rod portion is threadedly engaged with the threaded part, the core portion is positionally connected to an end portion of the rod portion close to the valve seat, the core portion is configured to be rotatable relative to the rod portion, and the core portion is configured to be able to block the valve port channel when in contact with the valve seat.

2. The stop valve according to claim 1, characterized in that: The core portion includes a core body, which has a first mounting tube extending toward the rod portion. A connecting head is provided at one end of the rod portion close to the core body, and the connecting head is configured to be inserted into the first mounting tube. The tube section of the first mounting tube facing away from the core body is constructed to be able to bend radially inward to form a first stop portion, and the first stop portion can be axially offset against the connecting head.

3. The stop valve according to claim 1, characterized in that: The core portion includes a core body. A second sealing member is assembled on a side of the core body facing away from the stem portion. The core portion abuts against the valve seat via the second sealing member.

4. The stop valve according to claim 3, characterized in that: The core body is provided with an annular groove, the bottom wall of the annular groove is provided with a countersunk groove, and the second sealing member is assembled in the annular groove.

5. The stop valve according to claim 3, characterized in that: The core also includes an annular gasket, and the core body also has a second mounting tube extending in a direction away from the rod portion. The annular gasket is outer-mounted on the second mounting tube, and the tube section of the second mounting tube away from the core body is constructed to be able to bend radially outward to form a second stop portion. The second stop portion can axially abut against the annular gasket, and the annular gasket can axially abut against the second seal.

6. The stop valve according to claim 3, characterized in that: The first valve body is made of stainless steel and is an integrally stretched pipe structure. The hardness of the second sealing component is smaller than that of the valve seat.

7. The stop valve according to any one of claims 1 to 6, characterized in that: The stop valve further includes a first connecting pipe, the wall portion 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 connecting pipe, the projection of the threaded member at least partially falls within the space enclosed by the first interface portion.

8. The stop valve according to any one of claims 1 to 6, characterized in that: It also includes a sleeve portion, which is installed in the first valve body, the threaded member is installed at one end of the sleeve portion close to the valve seat, the rod portion is inserted into the sleeve portion, and a first sealing member is provided between the rod portion and the sleeve portion.

9. The stop valve according to claim 8, characterized in that: It also includes a transition part, the sleeve part is installed on the transition part, or the sleeve part and the transition part are an integrated structure, and the transition part is fixedly connected to the first valve body.

10. A method for preparing a stop valve, characterized in that: The stop valve according to any one of claims 1 to 9, wherein the stop valve further comprises an adapter tube and a first valve cap, and the preparation method comprises at least the following steps: Assembling the valve body assembly and the valve seat, and welding the valve body assembly and the valve seat; Assembling a sleeve portion and a threaded member of a sleeve assembly, and welding the sleeve portion and the threaded member; Installing the stem portion on the sleeve portion, and installing the core portion of the valve stem assembly on the stem portion; Installing the adapter portion of the sleeve assembly on the valve body assembly; Welding and assembling an adapter tube on the sleeve portion; The first valve cap is detachably assembled to the adapter cylinder.

Images