Tank bottom valve

Abstract

The invention 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] The present invention belongs to the technical field of valves, and particularly relates to a bottom valve for a tank. Background Art

[0002] In industries such as biopharmaceuticals and food processing, bottom valves are mostly installed at the bottom of reaction vessels. The materials inside the vessels are discharged through the bottom valves to avoid material residue inside the reaction vessels and achieve continuous operation of different materials.

[0003] Existing bottom valves generally include a valve body, a valve core assembly, and an actuator. The actuator drives the valve core assembly to move to control the opening and closing state of the bottom valve. An important component of the valve core assembly is a seal. Driven by the actuator, the seal changes the position of the valve core assembly by its own deformation, thereby controlling the opening and closing state of the bottom valve. Existing bottom valves generally use the abutting force provided by the actuator to fix the seal on the valve body. Since the contact area between the seal and the valve body is limited, and the seal will produce a certain deformation during the opening and closing process of the bottom valve, the sealing performance at the contact part between the seal and the valve body is not ideal.

[0004] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a bottom valve for a tank, which is used to solve the problem of poor sealing performance at the contact part between the seal and the valve body of the existing bottom valve.

[0006] To achieve the above purpose, a specific embodiment of the present invention provides a bottom valve for a tank. The bottom valve includes a valve body, a valve core assembly, and an actuator. The valve body includes a receiving cavity and a material passage that communicate with each other. A sealing port is formed at the junction of the receiving cavity and the material passage. The valve body is also provided with a mounting hole, and a ring-shaped stop portion is formed on the inner 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 in the receiving cavity through the mounting hole. The valve core assembly includes a seal, and the seal includes a fixing portion that abuts against the side of the stop portion away from the receiving cavity and a sealing portion that extends from the fixing portion into the receiving cavity. The sealing portion can be controlled to open or close the sealing port. A second arc surface that can be in sealed contact with the first arc surface is formed on the circumferential outer wall of the sealing portion. 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 the present invention, in the direction away from the actuator, the opening diameters of both the first arc surface and the second arc surface gradually decrease.

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

[0009] In one or more embodiments of the present invention, 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 that abuts against the third arc surface is formed on the circumferential outer wall of the connecting portion.

[0010] In one or more embodiments of the present invention, the sealing portion includes a thin wall section connected to the fixing portion and a thick wall section for blocking the sealing port, and both the second arc surface and the third arc surface are formed on the thin wall 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. One of the valve stem and the valve core body is provided with a card slot, and the other is provided with a clamping portion that is clamped in the card slot.

[0012] In one or more embodiments of the present invention, a ball head that is embedded in the card slot is provided at one end of the clamping portion away from the seal.

[0013] In one or more embodiments of the present invention, the card slot is opened on the valve stem, and at least one side penetrates through the circumferential outer wall of the valve stem along the radial direction of the valve stem, and the clamping portion is circumferentially clamped in the card slot from the valve stem.

[0014] 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. A groove for accommodating the valve core body is opened on one side of the seal away from the sealing port. The valve core body includes a tapered section, and in the direction away from the actuator, the diameter of the tapered section and the opening diameter of the groove gradually decrease.

[0015] In one or more embodiments of the present invention, 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 the present invention, the valve body includes a mounting portion extending towards the actuator, and a mounting hole is opened on the mounting portion.

[0017] In one or more embodiments of the present invention, the bottom valve of the tank further includes a second nut threadedly connected to 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 the present invention increase the contact area between the valve body and the seal, and improve the sealing performance between the valve body and the seal. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0020] Figure 1 Front view structural diagram of the bottom valve of the tank in an embodiment of the present invention;

[0021] Figure 2 Explosion structural diagram of the bottom valve of the tank in an embodiment of the present invention;

[0022] Figure 3 Sectional structural diagram of the bottom valve of the tank in an embodiment of the present invention;

[0023] Figure 4 For Figure 3 Partial enlarged view of part A in

[0024] Figure 5 Sectional explosion diagram of the valve body and the valve core assembly in an embodiment of the present invention.

[0025] Main reference numeral description: 1. Valve body, 11. Accommodating cavity, 12. Material passage, 121. Feeding section, 122. Discharging section, 123. Sealing port, 13. Mounting part, 14. Mounting hole, 15. Stopping part, 151. First arc surface, 2. Valve core assembly, 21. Sealing member, 211. Fixing part, 212. Sealing part, 2121. Second arc surface, 2122. Third arc surface, 2123. Fourth arc surface, 2124. Thin wall section, 2125. Thick wall section, 213. Groove, 214. Threaded hole, 22. Valve core body, 221. Fifth arc surface, 222. Clamping part, 2221. Ball head, 2222. Shaft body, 23. First nut, 3. Actuator, 31. Valve rod, 311. Card slot, 32. Connecting part, 321. Sixth arc surface, 4. Second nut. Detailed implementation manners

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0028] In addition, the terms "second" and "first" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "second" and "first" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0029] In industries such as biopharmaceuticals and food processing, various reaction vessels are usually used. A bottom valve is mostly installed in the bottom area of the reaction vessel, and the materials in the reaction vessel are discharged through the bottom valve to avoid material residue in the reaction vessel and achieve continuous operation of different materials.

[0030] In the existing bottom valve, a material passage is provided inside the valve body, and a deformable seal is used to block the material passage. However, at the connection between the valve body and the seal, the sealing performance is relatively poor, and materials are likely to leak to 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, the present invention proposes an improved bottom valve, aiming to solve the problem of poor sealing performance between the valve body and the seal in the prior art. The core idea of the present invention is to improve the fitting degree and fitting area of the contact part between the valve body and the seal, so as to improve the sealing performance between the valve body and the seal as much as possible and reduce the probability of material leakage.

[0032] In one embodiment, referring to Figures 1 to 3 as shown, the present invention provides a bottom valve, which includes a valve body 1, a valve core assembly 2, and an actuator 3. The valve core assembly 2 is arranged inside the valve body 1 and is used to control the opening and closing state of the valve body 1. The actuator 3 is installed on the valve body 1 and is 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 chamber 11 and a material channel 12 located inside the valve body 1 and connected to each other. The receiving chamber 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 connected to the receiving chamber 11, and is 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 chamber 11 and the material channel 12. The sealing port 123 is generally formed at the junction of the receiving chamber 11 and the feed section 121. The valve body 1 is also provided with a mounting hole 14, and the valve core assembly 2 is mounted in the receiving chamber 11 via the mounting hole 14. An annular stopper 15 is formed on the hole wall of the mounting hole 14. The stopper 15 is equivalent to reducing the aperture of the mounting hole 14. A step structure is formed at the stopper 15, and a first arc surface 151 is formed on the circumferential inner wall of the stopper 15. The valve core assembly 2 includes a deformable seal 21, which includes a fixed portion 211 and a sealing portion 212 that are integrally connected. The fixed portion 211 is generally constructed as an annular structure and abuts against the side of the stopper 15 away from the accommodating chamber 11. The contact portion between the fixed portion 211 and the stopper 15 and the contact portion between the fixed portion 211 and the circumferential hole wall of the mounting hole 14 form a conventional sealing structure to achieve the first layer of sealing of the valve body 1 and the seal 21. The sealing portion 212 extends from the fixed portion 211 into the accommodating chamber 11 and toward the sealing port 123. Driven by the valve stem 31 of the actuator 3, the sealing portion 212 can generate a certain deformation to move itself away from or close to the sealing port 123, thereby opening or closing the sealing port 123 to open or block the material channel 12. A second arc surface 2121 is formed on the circumferential outer wall of the sealing portion 212, and the second arc surface 2121 is tightly fitted to the first arc surface 151, so that the two maintain a sealed contact and avoid a gap between the contact parts as much as possible. The actuator 3 includes a connecting portion 32 of the valve stem 31 inserted into the mounting hole 14, and the connecting portion 32 is axially abutted against the fixing portion 211, thereby limiting the axial movement of the fixing portion 211 and stabilizing the position of the fixing portion 211.

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

[0035] Considering that the sealing portion 212 will have a certain deformation in the open state so that the sealing portion 212 is separated from the sealing opening 123, in order not to affect the normal deformation of the sealing portion 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 configured as conical annular arc surfaces, and 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, so as to reduce the difficulty of the sealing portion 212 deforming in its axial direction.

[0036] In one embodiment, referring 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 portion 212 is in the open state, during the process of opening the sealing portion 212, the connecting portion 32 of the actuator 3 can be used to limit the movement of the second arc surface 2121.

[0037] Specifically, a groove 213 is formed on one side of the seal 21 close to the connecting portion 32. The connecting portion 32 at least partially extends into the groove 213 and abuts against the groove wall of the groove 213 corresponding to the second arc surface 2121, providing a stable abutting force to the portion of the sealing portion 212 located between the second arc surface 2121 and the connecting portion 32, firmly abutting the second arc surface 2121 against the first arc surface 151, and preventing the fitting degree of the first arc surface 151 and the second arc surface 2121 from changing when the sealing portion 212 deforms, so that when the sealing portion 212 is opened or closed, the first arc surface 151 can be tightly fitted with 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 groove 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 portion 212, that is, the third arc surface 2122 is the circumferential inner wall of the sealing portion 212, and the second arc surface 2121 is the circumferential outer wall of the sealing portion 212. A sixth arc surface 321 is formed on the circumferential outer wall of the connecting portion 32. When the connecting portion 32 abuts against the groove wall of the groove 213, the sixth arc surface 321 abuts against the third arc surface 2122, so as to better disperse the abutting force applied to the sealing portion 212 and reduce the stress concentration degree at the position where the connecting portion 32 abuts against the connecting portion 32.

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

[0040] In one embodiment, referring to Figure 5As shown, after the groove 213 is provided on the seal 21, the wall thickness of the sealing portion 212 on the side close to 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 block the sealing port 123, the thickness of the sealing portion 212 on the side close to the sealing port 123 is relatively large, and the rigidity is relatively strong, and it is not easy to deform after long-term use.

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

[0042] In one embodiment, referring to Figures 3 to 5 As shown, the valve core assembly 2 further includes a valve core body 22. The valve core body 22 is connected to the valve stem 31 of the actuator 3 and is also connected to the seal 21 through a first nut 23. A threaded hole 214 is formed on the seal 21. The first nut 23 is accommodated in the threaded hole 214 and maintains a threaded connection with the threaded hole 214. A stud structure is formed on the side of the valve core body 22 close to the seal 21. The valve core body 22 maintains a threaded connection with the first nut 23 through the stud structure, thereby fixedly connecting the seal 21 and the valve core body 22 together.

[0043] Further, the threaded hole 214 is opened on the bottom of the groove 213. The valve core body 22 is accommodated in the groove 213. 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 to better apply a force to the thin-wall section 2124 of the sealing portion 212, so that the thin-wall section 2124 can maintain a stable state.

[0044] In one embodiment, referring to Figures 3 to 5 As shown, the valve core body 22 includes a tapered section. The tapered section and the groove 213 are both tapered. The tapered section and the groove 213 are both configured to be similar to a conical structure. In the direction away from the actuator 3, the opening diameters of the tapered section and the groove 213 gradually decrease. 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 contacts the circumferential groove wall of the groove 213.

[0045] Further, 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 outer circumferential 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 contacts 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 fitting gradually improves, making it easier for the seal 21 to return to its original shape.

[0046] In one embodiment, as shown in Figures 3 to 5 a clamping groove 311 is formed on the valve stem 31. Specifically, the clamping groove 311 can be formed at one end of the valve stem 31 close to the valve core body 22. A clamping portion 222 is formed on the valve core body 22, and the clamping portion 222 is clamped in the clamping groove 311 to connect the valve core body 22 and the valve stem 31 together, facilitating the valve stem 31 to apply a force to the seal 21 through the valve core body 22.

[0047] In one embodiment, as shown in Figure 2 in order to facilitate the clamping portion 222 to be quickly clamped into the inside of the clamping groove 311 and prevent the axial movement of the valve stem 31 from affecting the clamping relationship between the clamping portion 222 and the clamping groove 311, at least one side of the clamping groove 311 penetrates the outer circumferential wall of the valve stem 31 along the radial direction of the valve stem 31, and the clamping portion 222 is circumferentially clamped in the clamping groove 311 from the valve stem 31.

[0048] Optionally, both sides of the clamping groove 311 penetrate the outer circumferential wall of the valve stem 31 along the radial direction of the valve stem 31, so that the operator can insert the clamping portion 222 into the inside of the clamping groove 311 from any side of the clamping groove 311.

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

[0050] To solve the above problems, in one embodiment, as shown in Figures 2 to 5 the valve stem 31 and the valve core body 22 are kept in an active connection to prevent the valve stem 31 and the valve core body 22 from transmitting torque to each other.

[0051] Specifically, a ball hinge connection is adopted between the valve stem 31 and the valve core body 22. One end of the clamping portion 222 away from the seal 21 is configured as a ball head 2221. The ball head 2221 is embedded in the card slot 311. The area of the card slot 311 accommodating the ball head 2221 is a first cylindrical groove body. The central axis of the first cylindrical groove body is substantially perpendicular to the central axis of the valve stem 31. When the valve stem 31 is subjected to a torque, it can only rotate itself and cannot drive the valve core body 22 and the seal 21 to rotate, improving the sealing performance between the seal 21 and the seal port 123 in the closed state.

[0052] Furthermore, the clamping portion 222 further includes a shaft body 2222 connecting the ball head 2221 and the valve core body 22. The shaft body 2222 is configured as a cylindrical structure, and the diameter of the shaft body 2222 is smaller than the diameter of the ball head 2221. To adapt to the structure of the clamping portion 222, the card slot 311 further includes a second cylindrical groove body penetrating from the first cylindrical groove body to the end face of the valve stem 31. The central axis of the second cylindrical groove body is parallel to the central axis of the valve stem 31, and the shaft body 2222 of the clamping portion 222 is accommodated in the second cylindrical groove body.

[0053] In one embodiment, referring to Figure 4 and Figure 5 as shown, to prevent yaw 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 attached to the surface of the valve core body 22, preventing the valve core body 22 from yawing 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 clamping portion 222 and the card slot 311 in the above embodiments are conventional selections in actual applications. For those skilled in the art, without departing from the technical principle of the present application, swapping the positions of the above clamping portion 222 and the card slot 311, that is, setting the card slot 311 on the valve core body 22 and the clamping portion 222 on the valve stem 31, should also be regarded as the protection scope of the present application.

[0055] In one embodiment, referring to Figure 2 as shown, the valve body 1 includes an installation portion 13 extending towards the actuator 3. The installation hole 14 is opened on the installation portion 13. The connecting portion 32 of the actuator 3 is inserted into the interior of the installation portion 13 through the installation hole 14. A second nut 4 is threadedly connected to the outer wall of the circumferential direction of the installation portion 13. The radial force applied to the installation 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, only loosen the second nut 4 to release its connection with the installation portion 13, and then the connecting portion 32 of the actuator 3 can be pulled out from the installation hole 14, and further separate the valve body 1 and the actuator 3.

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

[0057] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0058] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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 tank bottom valve, characterized in that: The tank bottom valve comprises: A valve body (1) comprises a receiving chamber (11) and a material passage (12) which are interconnected, a sealing opening (123) being formed at the junction of the receiving chamber (11) and the material passage (12), a mounting hole (14) being further provided on the valve body (1), an annular stopper (15) being formed on the hole wall of the mounting hole (14), and a first arc surface (151) being formed on the circumferential inner wall of the stopper (15); A valve core assembly (2) is installed in the accommodating chamber (11) via the installation hole (14), the valve core assembly (2) comprising a sealing member (21), the sealing member (21) comprising a fixing portion (211) abutting against a side of the stopper portion (15) away from the accommodating chamber (11) and a sealing portion (212) extending from the fixing portion (211) into the accommodating chamber (11), the sealing portion (212) being capable of opening or closing the sealing port (123) in a controlled manner, and a second arc surface (2121) capable of sealingly contacting the first arc surface (151) being formed on a circumferential outer wall of the sealing portion (212); The actuator (3) comprises a valve stem (31) for driving the sealing portion (212) to move and a connecting portion (32) inserted into the mounting hole (14), wherein the connecting portion (32) abuts against the fixing portion (211) along its axial direction.

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

3. The tank bottom valve according to claim 1, characterized in that: A groove (213) is formed on one side of the sealing member (21) close to the connecting portion (32), and the connecting portion (32) abuts against a groove wall of the groove (213) 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 portion (32).

5. The tank bottom valve according to claim 3, characterized in that: The sealing portion (212) comprises a thin-walled section (2124) connected to the fixing portion (211) and a thick-walled section (2125) for sealing the sealing opening (123), and the second curved surface (2121) and the third curved 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 comprises a valve core body (22) connected to the sealing member (21) and the valve stem (31); one of the valve stem (31) and the valve core body (22) is provided with a retaining groove (311), and the other is provided with a retaining portion (222) retained in the retaining groove (311).

7. The tank bottom valve according to claim 6, characterized in that: An end of the clamping portion (222) away from the sealing member (21) is provided with a ball head (2221) embedded in the clamping groove (311).

8. The tank bottom valve according to claim 6, characterized in that: The clamping groove (311) is formed on the valve stem (31), and at least one side thereof penetrates the circumferential outer wall of the valve stem (31) in the radial direction of the valve stem (31). The clamping portion (222) is clamped in the clamping groove (311) in the circumferential direction of the valve stem (31).

9. The tank bottom valve according to claim 1, characterized in that: The valve core assembly (2) further comprises a valve core body (22) connected to the sealing member (21) and the valve stem (31); a groove (213) for accommodating the valve core body (22) is provided on a side of the sealing member (21) away from the sealing opening (123); the valve core body (22) comprises a tapered section, and in a 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 a closed state, the circumferential outer wall of the tapered section and the circumferential groove wall of the groove (213) abut against each other.

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

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