Vertical double-check valve with novel structure

Abstract

The utility model provides a vertical double-check valve with a novel structure. The vertical double-check valve comprises a valve body, a first valve core unit assembly and a second valve core unit assembly, a water inlet cavity, a first water containing cavity, a water passing cavity, a second water containing cavity and a water outlet cavity which are sequentially connected are formed in the valve body. The first valve element unit assembly is horizontally arranged in the first water containing cavity so as to control connection and disconnection between the water inlet cavity and the first water containing cavity. The second valve element unit assembly is vertically arranged in the second water containing cavity so as to control connection and disconnection between the water passing cavity and the second water containing cavity. According to the vertical type double-check valve of the novel structure, the second valve element unit assembly is vertically arranged in the second water containing cavity, impurities are not prone to being deposited at the guiding position of the second valve element of the second valve element unit assembly, adhesion at the guiding position is avoided, opening during low-pressure water filling is guaranteed, and a water hammer during descaling is prevented; the closing speed of the second valve element unit assembly is guaranteed when high-pressure water flows back, and the high-pressure water is prevented from back flushing into a low-pressure water pipeline.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a novel vertical double check valve. Background Technology

[0002] Steel mill high-pressure descaling pipelines typically employ a turbid circulating water system. Double check valves are commonly used in the low-pressure charging pipeline of the descaling charging valve assembly. The primary function of the low-pressure charging pipeline is to fill the pipeline after the descaling valve. Simultaneously, when the descaling valve is open, it prevents high-pressure descaling water from backflowing into the low-pressure pipeline, which could cause pipeline rupture. The double check valve provides dual protection. However, because steel mill descaling pipelines use a turbid circulating water system, if the low-pressure charging pipeline is not used for a period of time, the valve stem guide may stick, affecting the valve's opening and closing. Furthermore, due to excessive impurities, the valve core seal is easily damaged when the valve is closed, leading to high-pressure water backflow into the low-pressure water pipeline.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of this utility model is to provide a new type of vertical double check valve, which is less prone to the accumulation of impurities in the valve core guide and valve core sealing area, ensuring normal low-pressure water filling and preventing high-pressure water from backflowing into the low-pressure water pipeline, making it stable in performance, easy to use and long-lasting.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A novel vertical double check valve includes a valve body, a first valve core unit assembly, and a second valve core unit assembly.

[0007] The valve body is provided with an inlet chamber, a first water chamber, a water passage chamber, a second water chamber, and an outlet chamber connected in sequence; the first water chamber, the water passage chamber, and the second water chamber are arranged in sequence from bottom to top; the inlet chamber is located to the side of the first water chamber, and the outlet chamber is located to the side of the second water chamber;

[0008] The first valve core unit assembly is horizontally disposed in the first water chamber to control the opening and closing between the water inlet chamber and the first water chamber, and to ensure that fluid can only flow from the water inlet chamber to the first water chamber;

[0009] The second valve core unit assembly is vertically disposed in the second water chamber to control the flow between the water passage chamber and the second water chamber, and to ensure that fluid can only flow from the water passage chamber to the second water chamber.

[0010] According to one embodiment of the present invention, the first valve core unit assembly includes a first valve seat, a first valve core, a first valve stem, and a first spring arranged sequentially, wherein the first valve seat, the first valve core, the first valve stem, and the first spring are all disposed within the first valve sleeve;

[0011] One end of the first valve seat is sealed to the outlet end of the water inlet chamber, and the other end is sealed to the inlet end of the first valve sleeve. The outlet ends of the first valve core and the first valve seat correspond to each other to open or close the outlet end of the first valve seat. The first valve stem is fixed to the first valve core and extends towards the outlet end of the first valve sleeve. The first valve stem can drive the first valve core to move between a first position and a second position. When the first valve core is in the first position, it closes the outlet end of the first valve seat. When the first valve core moves from the first position to the second position, it gradually releases the closure of the outlet end of the first valve seat. The first spring is sleeved on the first valve stem. One end of the first spring is connected to the inner wall of the outlet end of the first valve sleeve, and the other end abuts against the first valve core, so that the first valve core is normally located in the first position. The outer wall of the first valve sleeve is provided with a first flow hole corresponding to the outlet end of the first valve seat.

[0012] According to one embodiment of the present invention, the outer wall of the first valve sleeve is further provided with a second flow hole and a third flow hole; a partition plate extends inward from the inner wall of the outlet end of the first valve sleeve, a guide hole is provided in the middle of the partition plate, the first valve stem passes through the guide hole, and the first spring is connected to the inner side of the partition plate; a water flow hole is provided on the outer side of the partition plate; the second flow hole and the third flow hole correspond to the inner side and the outer side of the partition plate, respectively.

[0013] According to one embodiment of the present invention, the first valve sleeve is provided with a first stepped hole, a second stepped hole, a third stepped hole, the guide hole, and the water flow hole in sequence along the direction from the inlet end to the outlet end;

[0014] The inner circumference of the first stepped hole is connected to the outlet end of the first valve seat; when the first valve core is in the first position, one end of the first valve core corresponds to the connection between the first stepped hole and the second stepped hole, and the other end corresponds to the connection between the second stepped hole and the third stepped hole.

[0015] The second stepped hole includes a tapered hole segment and a straight segment connected in sequence, and the third stepped hole includes a large hole segment and a small hole segment connected in sequence; the inner diameter of the straight segment of the second stepped hole is smaller than the inner diameter of the large hole segment of the third stepped hole and larger than the inner diameter of the small hole segment of the third stepped hole.

[0016] According to one embodiment of the present invention, the valve body sidewall is provided with a first mounting port communicating with the first water-containing cavity, the first mounting port is provided with a first pad that abuts against the first valve core unit assembly, the outer side of the first pad is provided with a first pressure cover, and the first pressure cover is detachably connected to the valve body.

[0017] According to one embodiment of the present invention, the second valve core unit assembly includes a second valve sleeve and a second valve core, a second valve stem, a second spring, and a guide sleeve arranged sequentially from bottom to top within the second valve sleeve.

[0018] The bottom end of the second valve sleeve is sealed to the outlet end of the water passage cavity, and the bottom end of the second valve sleeve extends inward to provide an annular sealing portion; the guide sleeve is fixedly disposed at the top end of the second valve sleeve and extends downward to provide a cylindrical guide portion; the second valve stem is disposed in the guide portion and can move up and down; the second valve core is disposed at the bottom end of the second valve stem and corresponds to the sealing portion to open or close the sealing portion; the second spring is disposed in the guide portion and is located between the second valve stem and the guide sleeve, so that the second valve core normally abuts against the sealing portion; the outer wall of the second valve sleeve is provided with a fourth flow passage hole.

[0019] According to one embodiment of the present invention, the second valve stem is cylindrical and has a flow channel inside, and a fifth flow hole is provided on the outer wall of the bottom of the second valve stem; a sixth flow hole is provided on the outer wall of the top of the guide portion.

[0020] According to one embodiment of the present invention, the guide sleeve is provided with an exhaust port in the middle, and the exhaust port is connected to an exhaust valve;

[0021] And / or, the inner wall of the guide portion is provided with a spiral flow groove.

[0022] According to one embodiment of the present invention, the top of the valve body is provided with a second mounting port communicating with the second water-containing cavity, the second mounting port is provided with a second pad that abuts against the second valve core unit assembly, the outer side of the second pad is provided with a second pressure cover, the outer side of the second pressure cover is provided with a flange pressure cover, and the flange pressure cover is detachably connected to the valve body; the exhaust valve is provided inside the second pressure cover, and the second pressure cover and the second pad are provided with exhaust channels corresponding to the exhaust port.

[0023] According to one embodiment of the present invention, the side of the valve body is provided with an inlet connector connected to the inlet chamber and an outlet connector connected to the outlet chamber.

[0024] Compared with the prior art, the advantages and beneficial effects of the embodiments of this utility model are as follows:

[0025] The novel vertical double check valve provided in this embodiment of the invention comprises two valve core assemblies: a first valve core unit assembly and a second valve core unit assembly. These two valve core unit assemblies are connected in series, with the first valve core unit assembly being horizontal and the second valve core unit assembly being vertical. Compared to traditional double check valves, the fluid medium flows upwards, thus reducing the likelihood of impurities accumulating at the valve core guide, preventing adhesion at the guide, ensuring opening during low-pressure water filling, and preventing water hammer during descaling. It also ensures a fast closing speed for the second valve core unit assembly during high-pressure water backflow, preventing high-pressure water from flowing back into the low-pressure water pipeline. Furthermore, when the second valve core and the second valve sleeve are sealed shut, impurities are less likely to get stuck; due to water flow and gravity, impurities accumulate at the bottom of the valve body, protecting the seal and further preventing high-pressure water from entering the low-pressure water pipeline. This results in stable performance, ease of use, and a long service life. Furthermore, the fluid medium flows horizontally through the first valve core unit assembly, reducing energy loss. Then, the fluid medium flows vertically upwards through the second valve core unit assembly; its gravitational potential energy stabilizes the flow, resulting in more stable fluid control, reducing turbulence and fluctuations, and further enhancing the check valve effect. Moreover, when the inlet chamber loses pressure, gravity also strengthens the sealing performance of the second valve core unit assembly. Finally, structurally, the vertical second valve core unit assembly reduces the space occupied by the valve in the horizontal direction, resulting in a more compact structure and saving overall space in the piping system. Attached Figure Description

[0026] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an undue limitation of this utility model. Wherein:

[0027] Figure 1 A schematic diagram of the structure of the novel vertical double check valve provided in this embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the first valve core unit assembly of the novel vertical double check valve provided in this embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the first valve sleeve of the novel vertical double check valve provided in this embodiment of the utility model;

[0030] Figure 4 A schematic diagram of the second valve core unit assembly of the novel vertical double check valve provided in this embodiment of the utility model;

[0031] Figure 5 A schematic diagram of the guide sleeve for the novel vertical double check valve provided in this embodiment of the utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Valve body; 11. Inlet chamber; 12. First water-receiving chamber; 13. Through-flow chamber; 14. Second water-receiving chamber; 15. Outlet chamber; 2. Inlet connector; 21. Inlet flange; 22. Inlet seal; 3. First valve core unit assembly; 31. First valve seat; 32. First valve core; 33. First valve stem; 331. Second disassembly / assembly hole; 34. First spring; 35. First valve sleeve; 351. First flow passage; 352. Second flow passage; 353. Third flow passage; 354. Guide hole; 355. Water flow hole; 356. Third stepped hole; 357. Second stepped hole; 358. 36. First step hole; 4. Partition plate; 5. Second valve core assembly; 6. Second valve sleeve; 7. Sealing part; 8. Fourth flow passage; 9. Second valve core; 10. Second valve stem; 11. Flow channel; 12. Fifth flow passage; 13. Second spring; 14. Guide sleeve; 15. Guide part; 16. Sixth flow passage; 17. Exhaust port; 18. Flow groove; 19. Exhaust valve; 20. Second pad; 21. Second gland; 22. Flange gland; 33. Outlet connector; 44. Water outlet seal; 55. First pad; 66. First disassembly hole; 7. First gland. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0035] In the description of this utility model, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0036] like Figure 1 As shown, this utility model embodiment provides a novel vertical double check valve, including a valve body 1, a first valve core unit assembly 3, and a second valve core unit assembly 4. For clarity, the following definitions are provided. Figure 1 The upper part is called "upper" and the lower part is called "lower". The valve body 1 has an inlet chamber 11, a first water-containing chamber 12, a water-passing chamber 13, a second water-containing chamber 14, and an outlet chamber 15 connected in sequence. The first water-containing chamber 12, the water-passing chamber 13, and the second water-containing chamber 14 are arranged sequentially from bottom to top. The inlet chamber 11 is located to the side of the first water-containing chamber 12, and the outlet chamber 15 is located to the side of the second water-containing chamber 14. In this embodiment, the inlet chamber 11 and the outlet chamber 15 are located on opposite sides of the valve body 1. In other embodiments, the inlet chamber 11 and the outlet chamber 15 may also be located on the same side of the valve body 1. The first valve core unit assembly 3 is horizontally disposed within the first water-containing chamber 12 to control the flow between the inlet chamber 11 and the first water-containing chamber 12, and to ensure that fluid can only flow from the inlet chamber 11 to the first water-containing chamber 12. The second valve core unit assembly 4 is vertically disposed in the second water chamber 14 to control the flow between the water passage chamber 13 and the second water chamber 14, and to ensure that fluid can only flow from the water passage chamber 13 to the second water chamber 14.

[0037] The novel vertical double one-way valve provided in this embodiment operates as follows: When the descaling pipeline needs to be filled with water, low-pressure water enters the first valve core unit assembly 3 located in the first water-receiving chamber 12 from the inlet chamber 11. The hydraulic pressure of the water pushes the first valve core unit assembly 3 to open to the right and then enters the first water-receiving chamber 12. Next, the water flows from the through chamber 13 to the second valve core unit assembly 4 located in the second water-receiving chamber 14, and the water pressure pushes the second valve core unit assembly 4 to open upward, allowing the water to enter the second water-receiving chamber 14 and then the outlet chamber 15, finally flowing out from the outlet chamber 15 of the double one-way valve. When the descaling pipeline is filled with water, high-pressure water flows in from the outlet chamber 15, and the second valve core unit assembly 4 is quickly closed by the high-pressure water, preventing the high-pressure water from flowing back from the through chamber 13 to the low-pressure pipeline.

[0038] The novel vertical double check valve provided in this embodiment comprises two valve core assemblies: a first valve core unit assembly 3 and a second valve core unit assembly 4. These two valve core unit assemblies are connected in series, with the first valve core unit assembly 3 being horizontal and the second valve core unit assembly 4 being vertical. Compared to traditional double check valves, the upward flow of the fluid medium makes it less prone to impurity deposition at the valve core guide, facilitating valve opening. This not only meets the backflow prevention requirement but also provides stable performance, ease of use, and a long service life. Furthermore, the horizontal flow of the fluid medium through the first valve core unit assembly 3 reduces energy loss; subsequently, the fluid medium flows vertically upward through the second valve core unit assembly 4, where gravitational potential energy stabilizes its flow, resulting in more stable fluid control and reduced turbulence and fluctuations, further enhancing the check valve effect. Moreover, when the inlet chamber 11 loses pressure, gravity also strengthens the sealing performance of the second valve core unit assembly 4. Finally, structurally, the vertical second valve core unit assembly 4 reduces the horizontal space occupied by the valve, resulting in a compact structure and saving overall space in the piping system.

[0039] Specifically, such as Figures 1-3As shown, in one embodiment of this utility model, the first valve core unit assembly 3 includes a first valve seat 31, a first valve core 32, a first valve stem 33, and a first spring 34 arranged sequentially. The first valve seat 31, the first valve core 32, the first valve stem 33, and the first spring 34 are all housed within a first valve sleeve 35. One end of the first valve seat 31 is sealed to the outlet end of the water inlet chamber 11, and the other end is sealed to the inlet end of the first valve sleeve 35, for example, via a threaded connection. The first valve core 32 corresponds to the outlet end of the first valve seat 31 to open or close the outlet end of the first valve seat 31. The first valve stem 33 is fixed to the first valve core 32 and extends towards the outlet end of the first valve sleeve 35. The first valve stem 33 can drive the first valve core 32 to move between a first position and a second position. When the first valve core 32 is in the first position, it closes the outlet end of the first valve seat 31. When the first valve core 32 moves from the first position to the second position, it gradually releases the closure of the outlet end of the first valve seat 31. The first spring 34 is sleeved on the first valve stem 33. One end of the first spring 34 is connected to the inner wall of the outlet end of the first valve sleeve 35, and the other end abuts against the first valve core 32, so that the first valve core 32 is normally located in the first position. The outer wall of the first valve sleeve 35 is provided with a first flow hole 351 corresponding to the outlet end of the first valve seat 31. When the descaling pipeline needs to be filled with water, low-pressure water enters from the inlet chamber 11 into the valve port seal between the first valve seat 31 and the first valve core 32 of the first valve core unit assembly 3 located in the first water chamber 12. The hydraulic pressure of the water pushes the first valve core 32 to the right to the second position and opens the valve port, and then enters the first water chamber 12 through the first flow hole 351. When the inlet chamber 11 loses pressure or the water pressure in the water passage chamber 13 is too high, the first spring 34 and the water flow in the water passage chamber 13 work together to push the first valve core 32 back to the first position, so that the first valve core 32 abuts against the outlet end of the first valve seat 31 and seals it.

[0040] Furthermore, such as Figures 1-3 As shown, in a preferred embodiment of this utility model, the outer wall of the first valve sleeve 35 is further provided with a second flow hole 352 and a third flow hole 353. A partition 36 extends inward from the inner wall of the outlet end of the first valve sleeve. A guide hole 354 is provided in the middle of the partition 36, and the first valve stem 33 passes through the guide hole 354. The inner circumference of the guide hole 354 cooperates with the outer circumference of the first valve stem 33 to guide the horizontal movement of the first valve stem 33. The first spring 34 is connected to the inner side of the partition 36. A water flow hole 355 is provided on the outer side of the partition 36. The second flow hole 352 and the third flow hole 353 correspond to the inner and outer sides of the partition 36, respectively.

[0041] Specifically, such as Figures 1-3As shown, the first valve sleeve 35 has a first stepped hole 358, a second stepped hole 357, a third stepped hole 356, a guide hole 354, and a water flow hole 355 arranged sequentially along the direction from the inlet end to the outlet end. The inner circumference of the first stepped hole 358 is connected to the outlet end of the first valve seat 31. When the first valve core 32 is in the first position, one end of the first valve core 32 corresponds to the connection between the first stepped hole 358 and the second stepped hole 357, and the other end corresponds to the connection between the second stepped hole 357 and the third stepped hole 356. The second stepped hole 357 includes a tapered section and a straight section connected in sequence, and the third stepped hole 356 includes a large section and a small section connected in sequence. The inner circumference of the straight section of the second stepped hole 357 cooperates with the outer circumference of the first valve core 32 to guide the horizontal movement of the first valve core 32. Preferably, the inner diameter of the straight section of the second stepped hole 357 is smaller than the inner diameter of the large hole section of the third stepped hole 356 and larger than the inner diameter of the small hole section of the third stepped hole 356. This helps to reduce the guiding contact area of ​​the first valve core 32, reduce friction, and thus help guide the first valve core 32, making it more convenient to open and close the first valve core 32.

[0042] Specifically, the first flow hole 351, the second flow hole 352, and the third flow hole 353 are respectively connected to the interior of the first water-containing cavity 12, the water-passing cavity 13, and the first valve sleeve 35. Both the first flow hole 351 and the third flow hole 353 are inclined holes. When open, the water flow direction of the first flow hole 351 is inclined from the interior of the first valve sleeve 35 towards the first water-containing cavity 12 and the water-passing cavity 13, while the water flow direction of the third flow hole 353 is inclined from the first water-containing cavity 12 towards the first valve sleeve 35 and the flow hole 355. When the low-pressure water overcomes the weight of the valve internals, friction, and the spring force of the first spring, the first valve core 32 moves to the right inside the first valve sleeve 35 under the action of the rightward hydraulic pressure. The first valve stem 33 carries the first valve core 32 to the right. The water inlet chamber 11 is connected to the first water receiving chamber 12 and the water passage chamber 13 through the first flow hole 351. The first valve core unit assembly 3 opens, and a portion of the water in the water passage chamber 13 flows through the second flow hole 352 to the third step hole 356 and through the third flow hole 353 into the water outlet hole 355, balancing the unbalanced hydraulic pressure of the water inlet chamber 11 on the first valve core 32. In this way, it is relatively easy for the first valve core unit assembly 3 to fully open and close.

[0043] like Figure 1As shown, in one embodiment of this utility model, the valve body 1 has a first mounting port on its side wall that communicates with the first water-containing cavity 12. A first pad 6, which abuts against the first valve core unit assembly 3, is provided inside the first mounting port. A first pressure cap 7 is provided on the outer side of the first pad 6. The first pressure cap 7 is detachably connected to the valve body 1, for example, by screws. In this embodiment, after removing the screws from the first pressure cap 7, the first pad 6 can be removed using a disassembly tool (e.g., by screwing into the first disassembly hole 61 in the first pad 6). The first valve core unit assembly 3 can be disassembled and assembled as a set using the disassembly tool (e.g., by screwing into the second disassembly hole 331 of the first valve stem 33). The first valve core unit assembly 3 can be replaced as a set, facilitating maintenance. Furthermore, if impurities accumulate at the lower end of the first water-containing cavity 12 of the valve body 1, the first pressure cap 7 on the lower right side of the valve body 1 can be opened to disassemble and assemble the first pad 6 and the first valve core unit assembly 3 to remove the impurities.

[0044] like Figure 1 , Figure 4 , Figure 5 As shown, in one embodiment of this utility model, the second valve core unit assembly 4 includes a second valve sleeve 41 and a second valve core 42, a second valve stem 43, a second spring 44, and a guide sleeve 45 arranged sequentially from bottom to top within the second valve sleeve 41. The bottom end of the second valve sleeve 41 is sealed to the outlet end of the water passage chamber 13, and an annular sealing portion 411 extends inward from the bottom end of the second valve sleeve 41. The guide sleeve 45 is fixedly disposed at the top end of the second valve sleeve 41 and extends downward to provide a cylindrical guide portion 451. The second valve stem 43 is disposed within the guide portion 451 and can move up and down. The second valve core 42 is disposed at the bottom end of the second valve stem 43 and corresponds to the sealing portion 411 to open or close the sealing portion 411. The second spring 44 is disposed within the guide portion 451 and is located between the second valve stem 43 and the guide sleeve 45, so that the second valve core 42 normally abuts against the sealing portion 411. The outer wall of the second valve sleeve 41 is provided with a fourth flow hole 412. When water flows from the water passage chamber 13 into the valve port of the second valve core unit assembly 4 located in the second water storage chamber 14, the water pressure pushes the corresponding second valve core 42 to move upward, causing the water to flow through the fourth flow hole 412 into the second water storage chamber 14 and then into the outlet chamber 15, and finally out of the outlet chamber 15 of the double one-way valve. When the descaling pipeline is filled with water, high-pressure water flows in from the outlet chamber 15, and the second valve core 42 rebounds rapidly under the action of high-pressure water and presses against its corresponding sealing part 411, preventing high-pressure water from flowing back from the water passage chamber 13 into the low-pressure pipeline.

[0045] like Figure 1 , Figure 4 , Figure 5As shown, in one embodiment of this utility model, the second valve stem 43 is cylindrical and has an internal flow channel 431. The bottom outer wall of the second valve stem 43 has a fifth flow hole 432 communicating with the flow channel 431, and the top outer wall of the guide portion 451 has a sixth flow hole 452 communicating with its inner cavity. Further, in order to discharge gas from the fluid, the guide sleeve 45 has an exhaust port 453 communicating with the inner cavity of the guide portion 451 in the middle, and the exhaust port 453 is connected to an exhaust valve 46. Specifically, the top of the valve body 1 has a second mounting port communicating with the second water chamber 14. The second mounting port has a second pad 47 that abuts against the second valve core unit assembly 4. The outer side of the second pad 47 has a second pressure cover 48, and the outer side of the second pressure cover 48 has a flange pressure cover 49. The flange pressure cover 49 is detachably connected to the valve body 1, for example, by bolts. The vent valve 46 is located inside the second pressure cover 48, and the second pressure cover 48 and the second pad 47 are provided with venting channels corresponding to the vent port 453. The venting channel of the second pad 47 can also be used as a disassembly hole. The second pad 47 can be disassembled by screwing a disassembly tool into the disassembly hole. When the hydraulic force in the sealing part 411 of the second valve sleeve 41 overcomes the downward hydraulic force of the water in the outlet chamber 15, the weight of the valve internals, the downward thrust of the second spring, and the friction, the hydraulic pressure pushes the second valve core 42 upward. Under the drive of the second valve stem 43, the second valve core 42 slides upward, the second valve core unit assembly 4 opens, and the low-pressure water in the inner cavity of the second valve sleeve 41 flows to the outlet chamber 15 through the fourth flow hole 412, realizing the connection between the inlet chamber 11 and the outlet chamber 15. The upper side of the second valve core 42 abuts against the lower side of the guide part 451, and the valve is fully opened. As the second valve stem 43 moves slowly downward within the sealing part 451, the volume of the upper end of the guide part 451 gradually increases. Water in the outlet chamber 15 flows into the inner cavity of the second valve sleeve 41 and the upper end of the inner cavity of the guide part 451, increasing the downward thrust on the second valve core 42. As the second valve stem 43 moves slowly downward, the second spring 44 gradually unfolds, and water at the lower end of the flow channel 431 enters the inner cavity of the second valve sleeve 41 through the fifth flow hole 432 and then flows into the outlet chamber 15, reducing the hydraulic resistance on the second valve core 42 and making it easier to close the second valve core unit assembly 4. As the second valve stem 43 moves slowly upward within the inner cavity of the guide portion 451, the volume of the upper end of the inner cavity of the guide portion 451 gradually decreases. Water in the inner cavity of the guide portion 451 flows from the upper end into the inner cavity of the second valve sleeve 41 through the sixth flow hole 452 and flows out through the water outlet chamber 15. The second spring 44 is gradually compressed, and water in the water outlet chamber 15 flows into the lower end of the flow channel 431 through the fifth flow hole 432, balancing the hydraulic pressure between the water outlet chamber 15 and the flow channel 431. This prevents the flow channel 431 of the second valve stem 43 from becoming congested when the second valve core 42 moves, thus increasing the hydraulic pressure of the second valve core 42 moving upward. The gas generated by the water in the inner cavity of the guide portion 451 is discharged through the exhaust port 453, the exhaust channel in the second pressure cap 48 and the second pad 47, and the exhaust valve 46.

[0046] like Figure 5 As shown, in a preferred embodiment of the present invention, the inner wall of the guide portion 451 is provided with a spiral flow groove 454, which can reduce friction, increase flow capacity, reduce impurity deposition, reduce adhesion at the guide, and make the second valve core unit assembly 4 easy to open. While meeting the requirements for preventing backflow, it has stable performance, is easy to use, and has a long service life.

[0047] like Figure 1 , Figure 4 As shown, when disassembling the second valve core unit assembly 4, the flange cover 49 and the second cover 48 can be removed together using the disassembly tool, and then the second gasket 47 and the second valve core unit assembly 4 can be removed together using the disassembly tool. The second valve core unit assembly 4 can be replaced as a complete set, making maintenance convenient.

[0048] like Figure 1 As shown, to facilitate connection with pipelines, in one embodiment of this utility model, the valve body 1 has an inlet connector 2 connected to the inlet chamber 11 and an outlet connector 5 connected to the outlet chamber 15 on its side. Specifically, the inlet connector 2 is detachably connected to the valve body 1 via an inlet flange 21 (e.g., via screws), and the outlet connector 5 is detachably connected to the valve body 1 (e.g., via screws). Preferably, an inlet seal 22 is provided between the inlet flange 21 and the valve body 1, and an outlet seal 51 is provided between the outlet connector 5 and the valve body 1. Preferably, the inlet seal 22 is a low-pressure seal, satisfying the sealing condition of the inlet withstanding low-pressure water, and the outlet seal 51 is a high-pressure seal, satisfying the sealing condition of the outlet withstanding high-pressure water.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel vertical double check valve, characterized in that, It includes a valve body (1), a first valve core unit assembly (3) and a second valve core unit assembly (4); The valve body (1) is provided with an inlet chamber (11), a first water chamber (12), a water passage chamber (13), a second water chamber (14), and an outlet chamber (15) connected in sequence; the first water chamber (12), the water passage chamber (13), and the second water chamber (14) are arranged in sequence from bottom to top; the inlet chamber (11) is located to the side of the first water chamber (12), and the outlet chamber (15) is located to the side of the second water chamber (14); The first valve core unit assembly (3) is horizontally disposed in the first water chamber (12) to control the opening and closing between the water inlet chamber (11) and the first water chamber (12), and to ensure that fluid can only flow from the water inlet chamber (11) to the first water chamber (12); The second valve core unit assembly (4) is vertically disposed in the second water chamber (14) to control the flow between the water passage chamber (13) and the second water chamber (14) and to ensure that fluid can only flow from the water passage chamber (13) to the second water chamber (14).

2. The novel vertical double check valve according to claim 1, characterized in that, The first valve core unit assembly (3) includes a first valve seat (31), a first valve core (32), a first valve stem (33), and a first spring (34) arranged sequentially. The first valve seat (31), the first valve core (32), the first valve stem (33), and the first spring (34) are all located inside the first valve sleeve (35). One end of the first valve seat (31) is sealed to the outlet end of the water inlet chamber (11), and the other end is sealed to the inlet end of the first valve sleeve (35); the outlet ends of the first valve core (32) and the first valve seat (31) correspond to each other to open or close the outlet end of the first valve seat (31); the first valve stem (33) is fixed to the first valve core (32) and extends towards the outlet end of the first valve sleeve (35); the first valve stem (33) can drive the first valve core (32) to move between a first position and a second position, when the first valve core (32) is in the first position The outlet end of the first valve seat (31) is closed at the time. When the first valve core (32) moves from the first position to the second position, the closure of the outlet end of the first valve seat (31) is gradually released. The first spring (34) is sleeved on the first valve stem (33). One end of the first spring (34) is connected to the inner wall of the outlet end of the first valve sleeve (35), and the other end abuts against the first valve core (32), so that the first valve core (32) is normally located in the first position. The outer wall of the first valve sleeve (35) is provided with a first flow hole (351) corresponding to the outlet end of the first valve seat (31).

3. The novel vertical double check valve according to claim 2, characterized in that, The outer wall of the first valve sleeve (35) is also provided with a second flow hole (352) and a third flow hole (353); the inner wall of the outlet end of the first valve sleeve extends inward to provide a partition (36), the partition (36) is provided with a guide hole (354) in the middle, the first valve stem (33) passes through the guide hole (354), and the first spring (34) is connected to the inner side of the partition (36); the outer side of the partition (36) is provided with a water flow hole (355); the second flow hole (352) and the third flow hole (353) correspond to the inner side and the outer side of the partition (36) respectively.

4. The novel vertical double check valve according to claim 3, characterized in that, The first valve sleeve (35) is provided with a first stepped hole (358), a second stepped hole (357), a third stepped hole (356), a guide hole (354), and a water flow hole (355) that are interconnected in sequence along the direction from the inlet end to the outlet end; The inner circumference of the first stepped hole (358) is connected to the outlet end of the first valve seat (31); when the first valve core (32) is in the first position, one end of the first valve core (32) corresponds to the connection between the first stepped hole (358) and the second stepped hole (357), and the other end corresponds to the connection between the second stepped hole (357) and the third stepped hole (356); The second stepped hole (357) includes a tapered hole section and a straight section connected in sequence, and the third stepped hole (356) includes a large hole section and a small hole section connected in sequence; the inner diameter of the straight section of the second stepped hole (357) is smaller than the inner diameter of the large hole section of the third stepped hole (356) and larger than the inner diameter of the small hole section of the third stepped hole (356).

5. The novel vertical double check valve according to claim 4, characterized in that, The valve body (1) has a first mounting port on its side wall that communicates with the first water chamber (12). The first mounting port has a first pad (6) that abuts against the first valve core unit assembly (3). The first pad (6) has a first pressure cover (7) on its outer side. The first pressure cover (7) is detachably connected to the valve body (1).

6. The novel vertical double check valve according to any one of claims 1 to 5, characterized in that, The second valve core unit assembly (4) includes a second valve sleeve (41) and a second valve core (42), a second valve stem (43), a second spring (44) and a guide sleeve (45) arranged sequentially from bottom to top within the second valve sleeve (41); The bottom end of the second valve sleeve (41) is sealed to the outlet end of the water passage cavity (13), and the bottom end of the second valve sleeve (41) extends inward to provide an annular sealing part (411); the guide sleeve (45) is fixedly provided at the top end of the second valve sleeve (41) and extends downward to provide a cylindrical guide part (451); the second valve stem (43) is provided in the guide part (451) and can move up and down; the second valve core (42) is provided at the bottom end of the second valve stem (43) and corresponds to the sealing part (411) to open or close the sealing part (411); the second spring (44) is provided in the guide part (451) and is located between the second valve stem (43) and the guide sleeve (45), so that the second valve core (42) normally abuts against the sealing part (411); the outer wall of the second valve sleeve (41) is provided with a fourth flow hole (412).

7. The novel vertical double check valve according to claim 6, characterized in that, The second valve stem (43) is cylindrical and has a flow channel (431) inside. The bottom outer wall of the second valve stem (43) is provided with a fifth flow hole (432); the top outer wall of the guide part (451) is provided with a sixth flow hole (452).

8. The novel vertical double check valve according to claim 7, characterized in that, The guide sleeve (45) is provided with an exhaust port (453) in the middle, and the exhaust port (453) is connected to an exhaust valve (46); And / or, the inner wall of the guide portion (451) is provided with a spiral flow groove (454).

9. The novel vertical double check valve according to claim 8, characterized in that, The valve body (1) has a second mounting port at the top that communicates with the second water chamber (14). The second mounting port has a second pad (47) that abuts against the second valve core unit assembly (4). The second pad (47) has a second cover (48) on the outside. The second cover (48) has a flange cover (49) on the outside. The flange cover (49) is detachably connected to the valve body (1). The exhaust valve (46) is located inside the second cover (48). The second cover (48) and the second pad (47) have exhaust channels corresponding to the exhaust port (453).

10. The novel vertical double check valve according to claim 1, characterized in that, The valve body (1) has an inlet connector (2) connected to the inlet chamber (11) and an outlet connector (5) connected to the outlet chamber (15) on its side.

Images