Tank bottom valve

Abstract

The utility model discloses a tank bottom valve which comprises a valve body, a valve element assembly and an actuator. The valve body comprises a containing cavity and a material channel which are communicated with each other, a sealing opening is formed in the junction of the containing cavity and the material channel, a mounting hole is further formed in the valve body, an annular stopping part is formed on the hole wall of the mounting hole, and a first arc surface is formed on the circumferential inner wall of the stopping part. The valve element assembly is installed in the containing cavity through the installation hole and comprises a sealing piece, the sealing piece comprises a fixing part and a sealing part, the sealing part can be controlled to open or close the sealing opening, and a second arc face in sealing contact with the first arc face is formed on the sealing part. The actuator comprises a valve rod used for driving the sealing part to move and a connecting part inserted into the mounting hole, and the connecting part abuts against the fixing part in the axial direction of the connecting part. The first cambered surface on the valve body and the second cambered surface on the sealing piece increase the contact area of the valve body and the sealing piece, and the sealing performance between the valve body and the sealing piece is improved.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a tank bottom valve. Background Technology

[0002] In industries such as biopharmaceuticals and food processing, reaction vessels are mostly equipped with bottom valves to discharge materials from the vessel, preventing material residue from remaining inside and enabling continuous operation of different materials.

[0003] Existing tank bottom valves generally consist of a valve body, a valve core assembly, and an actuator. The actuator drives the valve core assembly to move, controlling the opening and closing state of the tank bottom valve. A crucial component of the valve core assembly is the seal. Under the actuator's drive, the seal deforms to change the position of the valve core assembly, thereby controlling the opening and closing state of the tank bottom valve. Currently, existing tank bottom valves typically use the holding force provided by the actuator to fix the seal to the valve body. However, due to the limited contact area between the seal and the valve body, and the deformation of the seal during the opening and closing process, the sealing performance at the contact point between the seal and the valve body is not ideal.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide a bottom valve for solving the problem of poor sealing performance at the contact point between the sealing element and the valve body in existing bottom valves.

[0006] To achieve the above objectives, a specific embodiment of this utility model provides a bottom valve for a tank, comprising a valve body, a valve core assembly, and an actuator. The valve body includes a accommodating cavity and a material channel that are interconnected. A sealing port is formed at the junction of the accommodating cavity and the material channel. The valve body also has a mounting hole, and an annular stop portion is formed on the wall of the mounting hole. A first arc surface is formed on the circumferential inner wall of the stop portion. The valve core assembly is installed into the accommodating cavity via the mounting hole. The valve core assembly includes a sealing element, comprising a fixing portion abutting against the stop portion on the side away from the accommodating cavity and a sealing portion extending from the fixing portion into the accommodating cavity. The sealing portion can controllably open or close the sealing port. A second arc surface is formed on the circumferential outer wall of the sealing portion, which can seal against the first arc surface. The actuator includes a valve stem for driving the sealing portion to move and a connecting portion inserted into the mounting hole. The connecting portion abuts against the fixing portion along its axial direction.

[0007] In one or more embodiments of this utility model, the opening diameters of both the first and second arc surfaces gradually decrease in the direction away from the actuator.

[0008] In one or more embodiments of this utility model, a groove is formed on the side of the seal near the connecting part, and the connecting part abuts against the groove wall corresponding to the second arc surface.

[0009] In one or more embodiments of this utility model, a third arc surface corresponding to the second arc surface is formed on the circumferential groove wall of the groove, and a sixth arc surface abutting against the third arc surface is formed on the circumferential outer wall of the connecting part.

[0010] In one or more embodiments of this utility model, the sealing part includes a thin-walled section connected to the fixing part and a thick-walled section for sealing the sealing opening, and the second arc surface and the third arc surface are both formed on the thin-walled section.

[0011] In one or more embodiments of the present invention, the valve core assembly further includes a valve core body connected to the seal and the valve stem, wherein one of the valve stem and the valve core body is provided with a slot, and the other is provided with a retaining part that is retained in the slot.

[0012] In one or more embodiments of this utility model, the end of the retaining part away from the seal is provided with a ball head that is embedded in the slot.

[0013] In one or more embodiments of this utility model, a slot is formed on the valve stem, and at least one side extends radially through the circumferential outer wall of the valve stem, with the retaining part retaining itself circumferentially within the slot.

[0014] In one or more embodiments of the present invention, the valve core assembly further includes a valve core body connected to a seal and a valve stem. The seal has a groove for accommodating the valve core body on the side away from the sealing port. The valve core body includes a tapered section, and the diameter of the tapered section and the opening diameter of the groove gradually decrease in the direction away from the actuator.

[0015] In one or more embodiments of this utility model, when the seal is in the closed state, the circumferential outer wall of the tapered section and the circumferential groove wall of the groove abut against each other.

[0016] In one or more embodiments of this utility model, the valve body includes a mounting portion extending toward the actuator, and a mounting hole is formed on the mounting portion.

[0017] In one or more embodiments of this utility model, the bottom valve further includes a second nut threaded onto the circumferential outer wall of the mounting portion.

[0018] Compared with the prior art, the first arc surface on the valve body and the second arc surface on the seal of this utility model increase the contact area between the valve body and the seal, thereby improving the sealing performance between the valve body and the seal. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view of the bottom valve in one embodiment of the present invention;

[0021] Figure 2 This is an exploded view of the bottom valve in one embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional view of the bottom valve in one embodiment of the present invention;

[0023] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0024] Figure 5 This is an exploded cross-sectional view of the valve body and valve core assembly in one embodiment of the present invention.

[0025] Explanation of main reference numerals: 1. Valve body; 11. Receiving cavity; 12. Material channel; 121. Feed section; 122. Discharge section; 123. Sealing port; 13. Mounting part; 14. Mounting hole; 15. Stop part; 151. First arc surface; 2. Valve core assembly; 21. Seal; 211. Fixing part; 212. Sealing part; 2121. Second arc surface; 2122. Third arc surface; 2123. Fourth arc surface; 2124. Thin-walled section; 2125. Thick-walled section; 213. Groove; 214. Threaded hole; 22. Valve core body; 221. Fifth arc surface; 222. Holding part; 2221. Ball head; 2222. Shaft; 23. First nut; 3. Actuator; 31. Valve stem; 311. Slot; 32. Connecting part; 321. Sixth arc surface; 4. Second nut. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0027] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "second" and "first" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "second" or "first" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In industries such as biopharmaceuticals and food processing, various reaction vessels are commonly used. Most reaction vessels are equipped with bottom valves at the bottom to discharge materials from the reaction vessel, preventing material residue and enabling continuous operation of different materials.

[0030] Existing tank bottom valves have a material channel inside the valve body, which is blocked by a deformable seal. However, the sealing performance is relatively poor at the connection between the valve body and the seal, and the material can easily leak into the external environment through the gap between the valve body and the seal, causing pollution to the external environment.

[0031] Based on the above problems, this utility model proposes an improved tank bottom valve, aiming to solve the problem of poor sealing between the valve body and the sealing element in the prior art. The core idea of ​​this utility model is to improve the degree of contact and contact area between the valve body and the sealing element, so as to maximize the sealing performance between the valve body and the sealing element and reduce the probability of material leakage.

[0032] In one embodiment, reference is made to Figures 1 to 3 As shown, this utility model provides a bottom valve for a tank, which includes a valve body 1, a valve core assembly 2, and an actuator 3. The valve core assembly 2 is disposed inside the valve body 1 and is used to control the opening and closing state of the valve body 1. The actuator 3 is mounted on the valve body 1 and connected to the valve core assembly 2. The actuator 3 is used to drive the valve core assembly 2 to perform corresponding actions inside the valve body 1 to change the opening and closing state of the valve body 1.

[0033] Specifically, the valve body 1 includes a receiving cavity 11 and a material channel 12 located inside and communicating with each other. The receiving cavity 11 is used to receive the valve core assembly 2. The material channel 12 generally includes a feed section 121 and a discharge section 122 communicating with the receiving cavity 11, used to discharge the material entering the valve body 1 to the outside of the valve body 1. A sealing port 123 is formed at the junction of the receiving cavity 11 and the material channel 12. The sealing port 123 is generally formed at the junction of the receiving cavity 11 and the feed section 121. The valve body 1 is also provided with a mounting hole 14. The valve core assembly 2 is installed into the receiving cavity 11 through the mounting hole 14. An annular stop portion 15 is formed on the wall of the mounting hole 14. The stop portion 15 is equivalent to reducing the diameter of the mounting hole 14. A stepped structure is formed at the stop portion 15. A first arc surface 151 is formed on the circumferential inner wall of the stop portion 15. The valve core assembly 2 includes a deformable seal 21. The seal 21 includes an integrally connected fixing portion 211 and a sealing portion 212. The fixing portion 211 is generally constructed in an annular shape and abuts against the side of the stop portion 15 away from the receiving cavity 11. The contact portion between the fixing portion 211 and the stop portion 15, and the contact portion between the fixing portion 211 and the circumferential hole wall of the mounting hole 14, form a conventional sealing structure, achieving a first layer of sealing for the valve body 1 and the seal 21. The sealing portion 212 extends from the fixing portion 211 into the receiving cavity 11 and extends toward the sealing port 123. Under the drive of the valve stem 31 of the actuator 3, the sealing portion 212 can deform to move away from or toward the sealing port 123, thereby opening or closing the sealing port 123 to open or block the material passage 12. A second arcuate surface 2121 is formed on the circumferential outer wall of the sealing part 212. The second arcuate surface 2121 is tightly fitted to the first arcuate surface 151, so that the two maintain a sealed contact and minimize the gap at the contact point. The actuator 3 includes a connecting part 32 of the valve stem 31 inserted into the mounting hole 14. The connecting part 32 abuts against the fixing part 211 along its axial direction, thereby restricting the axial movement of the fixing part 211 and stabilizing the position of the fixing part 211.

[0034] The first arc surface 151 and the second arc surface 2121 are additional sealing structures added in this application, which are equivalent to increasing the contact area between the valve body 1 and the seal 21. The fit between the arc surfaces is relatively good, and the sealing contact between the first arc surface 151 and the second arc surface 2121 realizes a second layer of sealing for the valve body 1 and the seal 21.

[0035] Considering that the sealing part 212 will undergo a certain deformation when it is open, causing the sealing part 212 to disengage from the sealing port 123, in order not to affect the normal deformation of the sealing part 212, in one embodiment, refer to Figure 4 and Figure 5As shown, the first arc surface 151 and the second arc surface 2121 are both constructed as conical annular arc surfaces, and the opening diameters of the first arc surface 151 and the second arc surface 2121 gradually decrease in the direction away from the actuator 3, so as to reduce the difficulty of the sealing part 212 deforming in its axial direction.

[0036] In one embodiment, reference is made to Figures 3 to 5 As shown, in order to ensure that the first arc surface 151 and the second arc surface 2121 can still fit tightly when the sealing part 212 is open, the movement of the second arc surface 2121 can be restricted by the connecting part 32 of the actuator 3 during the opening of the sealing part 212.

[0037] Specifically, a groove 213 is formed on the side of the seal 21 near the connecting portion 32. The connecting portion 32 extends at least partially into the groove 213 and abuts against the groove wall of the groove 213 corresponding to the second arc surface 2121. This provides a stable supporting force to the portion of the seal 212 located between the second arc surface 2121 and the connecting portion 32, firmly holding the second arc surface 2121 against the first arc surface 151. This prevents the sealing portion 212 from changing the fit between the first arc surface 151 and the second arc surface 2121 when it deforms. As a result, when the sealing portion 212 is opened or closed, the first arc surface 151 can fit tightly against the second arc surface 2121, improving the sealing performance between the valve body 1 and the seal 21.

[0038] Furthermore, a third arc surface 2122 is formed on the circumferential wall of the groove 213. The third arc surface 2122 is disposed opposite to the second arc surface 2121 on the circumferential outer wall of the sealing part 212. That is, the third arc surface 2122 is the circumferential inner wall of the sealing part 212, and the second arc surface 2121 is the circumferential outer wall of the sealing part 212. A sixth arc surface 321 is formed on the circumferential outer wall of the connecting part 32. When the connecting part 32 abuts against the groove wall of the groove 213, the sixth arc surface 321 abuts against the third arc surface 2122 to better disperse the holding force applied to the sealing part 212 and reduce the stress concentration at the abutment position of the connecting part 32.

[0039] Optionally, both the third arc surface 2122 and the sixth arc surface 321 are constructed as conical annular arc surfaces, and the opening diameters of the third arc surface 2122 and the sixth arc surface 321 gradually decrease in the direction away from the actuator 3.

[0040] In one embodiment, reference is made to Figure 5As shown, after the groove 213 is provided on the seal 21, the wall thickness of the sealing part 212 on the side near the actuator 3 is reduced, and the rigidity is relatively weaker, making it easier to deform under the drive of the actuator 3. In order to better seal the sealing opening 123, the thickness of the sealing part 212 on the side near the sealing opening 123 is relatively large, and the rigidity is relatively strong, making it less prone to deformation after long-term use.

[0041] Furthermore, the groove 213 causes the sealing portion 212 to form a thin-walled section 2124 and a thick-walled section 2125. The thin-walled section 2124 is connected to the fixing portion 211, and the thick-walled section 2125 extends from the side of the thin-walled section 2124 away from the fixing portion 211 toward the sealing opening 123. The second arc surface 2121 and the third arc surface 2122 of the sealing portion 212 are both formed on the thin-walled section 2124. The second arc surface 2121 is specifically formed on the circumferential outer wall of the thin-walled section 2124, and the third arc surface 2122 is specifically formed on the circumferential inner wall of the thin-walled section 2124.

[0042] In one embodiment, reference is made to Figures 3 to 5 As shown, the valve core assembly 2 also includes a valve core body 22, which is connected to the valve stem 31 of the actuator 3 and is also connected to the seal 21 via a first nut 23. A threaded hole 214 is formed on the seal 21, and the first nut 23 is housed within the threaded hole 214 and maintains a threaded connection with it. A stud structure is formed on the side of the valve core body 22 near the seal 21, and the valve core body 22 maintains a threaded connection with the first nut 23 via the stud structure, thereby fixing the seal 21 and the valve core body 22 together.

[0043] Furthermore, the threaded hole 214 is opened on the bottom of the groove 213, the valve core body 22 is housed in the groove 213, and when the seal 21 is in the closed state, that is, when the seal 21 blocks the sealing port 123, the circumferential outer wall of the valve core body 22 fits against the circumferential groove wall of the groove 213, so as to better apply force to the thin-walled section 2124 of the sealing part 212, so that the thin-walled section 2124 can maintain a stable state.

[0044] In one embodiment, reference is made to Figures 3 to 5 As shown, the valve core body 22 includes a tapered section, and both the tapered section and the groove 213 are tapered in shape. Both the tapered section and the groove 213 are constructed with a cone-like structure, and the opening diameter of the tapered section and the groove 213 gradually decreases in the direction away from the actuator 3. During the process of the seal 21 changing from the open state to the closed state, the circumferential outer wall of the tapered section gradually comes into contact with the circumferential groove wall of the groove 213.

[0045] Furthermore, a fourth arc surface 2123 is formed on the circumferential groove wall of the groove 213, and a fifth arc surface 221 is formed on the circumferential outer wall of the tapered section of the valve core body 22. During the process of the seal 21 changing from the open state to the closed state, the fifth arc surface 221 gradually comes into contact with the fourth arc surface 2123, the contact area between the fifth arc surface 221 and the fourth arc surface 2123 gradually increases, and the degree of fit gradually improves, making it easier for the seal 21 to return to its original shape.

[0046] In one embodiment, reference is made to Figures 3 to 5 As shown, a slot 311 is provided on the valve stem 31. Specifically, the slot 311 can be provided at one end of the valve stem 31 near the valve core body 22. A retaining part 222 is formed on the valve core body 22. The retaining part 222 is retained in the slot 311 to connect the valve core body 22 and the valve stem 31 together, so that the valve stem 31 can apply force to the sealing member 21 through the valve core body 22.

[0047] In one embodiment, reference is made to Figure 2 As shown, in order to facilitate the quick insertion of the retaining part 222 into the interior of the retaining groove 311 and to prevent the axial movement of the valve stem 31 from affecting the retaining relationship between the retaining part 222 and the retaining groove 311, at least one side of the retaining groove 311 penetrates the circumferential outer wall of the valve stem 31 radially, and the retaining part 222 is circumferentially retained in the retaining groove 311.

[0048] Optionally, the two sides of the slot 311 extend radially through the circumferential outer wall of the valve stem 31, so that the operator can insert the retaining part 222 into the interior of the slot 311 from either side of the slot 311.

[0049] Considering that the internal components of actuator 3 may apply torque to valve stem 31, valve stem 31 may rotate under the action of torque. When valve stem 31 transmits its rotational state to seal 21, it will drive seal 21 to rotate. The rotational movement of seal 21 in the closed state will change the sealing state between seal 21 and sealing port 123, resulting in material leakage.

[0050] To address the above problems, in one embodiment, reference is made to... Figures 2 to 5 As shown, the valve stem 31 and the valve core body 22 are kept in a movable connection to prevent torque from being transmitted between the valve stem 31 and the valve core body 22.

[0051] Specifically, the valve stem 31 and the valve core body 22 are connected by a ball joint. The end of the retaining part 222 away from the seal 21 is constructed as a ball head 2221, which is embedded in the groove 311. The area of ​​the groove 311 that accommodates the ball head 2221 is a first cylindrical groove, and the central axis of the first cylindrical groove is approximately perpendicular to the central axis of the valve stem 31. When the valve stem 31 is subjected to torque, it can only rotate on its own and cannot drive the valve core body 22 and the seal 21 to rotate, thereby improving the sealing performance between the seal 21 and the sealing port 123 in the closed state.

[0052] Furthermore, the retaining part 222 also includes a shaft 2222 connecting the ball head 2221 and the valve core body 22. The shaft 2222 is constructed as a cylindrical structure, and the diameter of the shaft 2222 is smaller than the diameter of the ball head 2221. To accommodate the structure of the retaining part 222, the retaining groove 311 also includes a second cylindrical groove extending from the first cylindrical groove to the end face of the valve stem 31. The central axis of the second cylindrical groove is parallel to the central axis of the valve stem 31, and the shaft 2222 of the retaining part 222 is housed within the second cylindrical groove.

[0053] In one embodiment, reference is made to Figure 4 and Figure 5 As shown, in order to prevent the valve core body 22 from wobbling between the valve core body 22 and the valve stem 31, the end face of the valve stem 31 near the valve core body 22 is in contact with the surface of the valve core body 22 to prevent the valve core body 22 from wobbling when the valve stem 31 applies an axial force to the valve core body 22.

[0054] It should be noted that the positions of the holding part 222 and the slot 311 in the above embodiments are conventional choices in actual applications. For those skilled in the art, without departing from the technical principles of this application, if the positions of the holding part 222 and the slot 311 are interchanged, that is, the slot 311 is set on the valve core body 22 and the holding part 222 is set on the valve stem 31, it should also be considered as the scope of protection of this application.

[0055] In one embodiment, reference is made to Figure 2 As shown, the valve body 1 includes a mounting portion 13 extending toward the actuator 3. A mounting hole 14 is formed in the mounting portion 13. The connecting portion 32 of the actuator 3 is inserted into the interior of the mounting portion 13 through the mounting hole 14. A second nut 4 is threaded onto the outer circumferential wall of the mounting portion 13. The radial force applied to the mounting portion 13 by the second nut 4 stably connects the valve body 1 and the actuator 3 together. When it is necessary to disassemble the valve body 1 and the actuator 3, simply loosen the second nut 4 to disconnect it from the mounting portion 13, and the connecting portion 32 of the actuator 3 can be pulled out from the mounting hole 14, thereby separating the valve body 1 and the actuator 3.

[0056] In one embodiment, the actuator 3 can be manual, electric, pneumatic, hydraulic, or other forms capable of generating driving force. The actuator 3 can be a cylinder, hydraulic cylinder, motor, electric cylinder, or other structure capable of generating driving force.

[0057] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bottom valve for a tank, characterized in that, The tank bottom valve includes: The valve body (1) includes a accommodating cavity (11) and a material channel (12) that are interconnected. A sealing port (123) is formed at the junction of the accommodating cavity (11) and the material channel (12). The valve body (1) is also provided with an installation hole (14). An annular stop part (15) is formed on the wall of the installation hole (14). A first arc surface (151) is formed on the circumferential inner wall of the stop part (15). The valve core assembly (2) is installed into the receiving cavity (11) via the mounting hole (14). The valve core assembly (2) includes a seal (21). The seal (21) includes a fixing part (211) abutting against the side of the stop (15) away from the receiving cavity (11) and a sealing part (212) extending from the fixing part (211) into the receiving cavity (11). The sealing part (212) can controllably open or close the sealing port (123). A second arc surface (2121) is formed on the circumferential outer wall of the sealing part (212) that can seal against the first arc surface (151). The actuator (3) includes a valve stem (31) for driving the sealing part (212) to move and a connecting part (32) inserted into the mounting hole (14), the connecting part (32) abutting against the fixing part (211) along its axial direction.

2. The tank bottom valve according to claim 1, characterized in that, In the direction away from the actuator (3), the opening diameters of the first arc surface (151) and the second arc surface (2121) gradually decrease.

3. The tank bottom valve according to claim 1, characterized in that, The sealing element (21) has a groove (213) formed on the side near the connecting part (32), and the connecting part (32) abuts against the groove (213) and the groove wall corresponding to the second arc surface (2121).

4. The tank bottom valve according to claim 3, characterized in that, A third arc surface (2122) corresponding to the second arc surface (2121) is formed on the circumferential groove wall of the groove (213), and a sixth arc surface (321) abutting against the third arc surface (2122) is formed on the circumferential outer wall of the connecting part (32).

5. The tank bottom valve according to claim 3, characterized in that, The sealing part (212) includes a thin-walled section (2124) connected to the fixing part (211) and a thick-walled section (2125) for sealing the sealing port (123). The second arc surface (2121) and the third arc surface (2122) are both formed on the thin-walled section (2124).

6. The tank bottom valve according to claim 1, characterized in that, The valve core assembly (2) further includes a valve core body (22) connected to the seal (21) and the valve stem (31). One of the valve stem (31) and the valve core body (22) is provided with a slot (311), and the other is provided with a retaining part (222) that is held in the slot (311).

7. The tank bottom valve according to claim 6, characterized in that, The retaining part (222) has a ball head (2221) that is embedded in the slot (311) at the end away from the seal (21).

8. The tank bottom valve according to claim 6, characterized in that, The slot (311) is formed on the valve stem (31), and at least one side extends radially through the circumferential outer wall of the valve stem (31). The retaining part (222) is circumferentially retained in the slot (311) from the valve stem (31).

9. The tank bottom valve according to claim 1, characterized in that, The valve core assembly (2) further includes a valve core body (22) connected to the seal (21) and the valve stem (31). The seal (21) has a groove (213) for accommodating the valve core body (22) on the side away from the sealing port (123). The valve core body (22) includes a tapered section. In the direction away from the actuator (3), the diameter of the tapered section and the opening diameter of the groove (213) gradually decrease. When the seal is in the closed state, the circumferential outer wall of the tapered section abuts against the circumferential groove wall of the groove (213).

10. The tank bottom valve according to claim 1, characterized in that, The valve body (1) includes a mounting portion (13) extending toward the actuator (3), and the mounting hole (14) is formed on the mounting portion (13); The bottom valve of the tank also includes a second nut (4) that is threaded onto the outer circumferential wall of the mounting part (13).

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