Sealing plug and valve

Abstract

A sealing plug, a valve stem, and a valve. The sealing plug comprises: a first tubular body part, wherein the first tubular body part is internally provided with a first hole section passing through the first tubular body part; and a flange part, wherein the flange part is connected to the first tubular body part and is internally provided with a second hole section passing through the flange part, the second hole section is communicated with the first hole section, and the side of the flange part connected to the first tubular body part is at least provided with an annular flange. The valve can save materials and reduce costs while ensuring sealing performance, can reduce leakage over long-term storage, and can reduce clogging caused by repeated use.

Description

Sealing plug and valve Technical Field

[0001] The present invention relates to the technical field of sealing, and in particular to a sealing plug for manufacturing a valve, and a valve for sealing and releasing an aerosol stored in a container. Background Art

[0002] Valves are typically installed at the opening of a container. When closed, they create a high-pressure seal within the container, effectively preserving the aerosol. When opened, the aerosol is released under the high internal pressure. Existing valves of this type have the following issues: condensation can easily cause clogging after repeated use; excessive internal pressure can easily cause the seal cup to deform during long-term storage, leading to aerosol leakage due to poor airtightness. Summary of the Invention

[0003] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, the present invention provides a sealing plug, comprising:

[0005] a first pipe body part, the first pipe body part having a first hole section penetrating the first pipe body part;

[0006] The flange portion is connected to the first tube body portion, and a second hole section is provided in the flange portion and passes through the flange portion. The second hole section is connected to the first hole section and is coaxially arranged. On the side where the flange portion is connected to the first tube body portion, at least one annular flange is provided that is coaxial with the second hole section.

[0007] Preferably, the inner diameter of the second hole section is larger than the inner diameter of the first hole section.

[0008] Preferably, the inner diameter of the connection between the second hole segment and the first hole segment is smaller than the inner diameter of the second hole segment at the opening on the flange portion.

[0009] Preferably, the second hole section is a tapered hole.

[0010] Preferably, the angle a between the inner wall surface of the second hole segment and the horizontal plane is greater than a preset angle.

[0011] Preferably, the preset angle is 80 degrees to 87 degrees.

[0012] Preferably, the preset angle is 80 degrees, or 82 degrees, or 85 degrees, or 87 degrees.

[0013] Preferably, at least one annular protrusion is provided at the connection point between the first hole segment and the second hole segment.

[0014] Preferably, the height of the annular protrusion is equal to the minimum value of the difference between the inner diameters of the second hole section and the first hole section.

[0015] Preferably, the inner wall surface area of ​​the second hole section is 27.6 mm 2 -85.6mm 2 .

[0016] A sealing cup, comprising: an annular side plate portion and a bottom plate portion;

[0017] The bottom plate portion is a cylindrical structure with one end open. The inner wall of the annular side plate portion is connected to the open end of the bottom plate portion. The outer wall of the annular side plate portion extends away from the bottom plate portion and folds toward the flange portion to form an annular groove. The opening direction of the annular groove is opposite to the opening direction of the bottom plate portion.

[0018] A first mounting hole is provided at the center of the closed end of the bottom plate portion, and a first fold is provided around the first mounting hole. The first fold forms a first type of annular groove on the first inner surface of the bottom plate portion, and the first fold forms a corresponding first type of annular protrusion on the first outer surface of the bottom plate portion.

[0019] Preferably, at least one second fold concentric with the first fold is provided on the bottom plate portion, the second fold forms a second type of annular groove on the first inner surface of the bottom plate portion, and the second fold forms a corresponding second type of annular protrusion on the first outer surface of the bottom plate portion.

[0020] A valve stem comprises: a second tube body portion and a seat body portion;

[0021] The second tube body has a central hole;

[0022] The seat body portion is connected to the second tube body portion. The second tube body portion is provided with at least one lateral opening on one side close to the seat body portion. The lateral opening is communicated with the central hole.

[0023] Preferably, a first annular protrusion having a first annular abutting surface extends from the outer wall of the second tubular body portion.

[0024] Preferably, the lower end surface of the first annular protrusion is spaced a first distance from the upper end surface of the seat body.

[0025] A valve comprises a valve stem, a sealing plug sleeved on the valve stem, and a sealing cup sleeved on the outside of the sealing plug.

[0026] Preferably, the bottom plate portion is sleeved on the first tube body portion through the first mounting hole, and the flange portion is provided with a side of an annular flange abutting against the first inner surface of the bottom plate portion, and the annular flange is located in the first type annular pressure groove.

[0027] Preferably, the contact area between the upper surface of the flange portion and the first inner surface of the bottom plate portion at least covers the first type of annular pressing groove.

[0028] Preferably, a second annular protrusion having a second annular abutting surface extends from the outer side wall of the first tube body portion, and the end surface of the first mounting hole is in tight abutment with the second annular abutting surface.

[0029] Preferably, the second tube body portion is installed in the first hole segment and the second hole segment, a seal is formed between the outer wall of the second tube body portion and the inner wall of the first hole segment, the lateral opening is located in the second hole segment, and when the valve stem is in an unstressed state, the first annular bottom surface of the flange portion and the second upper surface of the seat body portion are tightly abutted to form a seal, the second hole segment is in a compressed state, and the height of the compressed second hole segment is h1.

[0030] Preferably, the end surface of the first tube portion away from the flange portion is a first annular top surface, and the first annular top surface is in tight contact with the first annular abutting surface.

[0031] Preferably, the inner diameter of the first hole section is adapted to the outer diameter of the first distance section of the second tube body portion.

[0032] Preferably, the height of the sealing plug is greater than the first distance.

[0033] Preferably, the difference between the height of the sealing plug and the first distance is equal to the height of the annular protrusion.

[0034] Preferably, the axial height of the lateral opening is a second distance h2, the height h1 of the second hole segment is greater than the second distance h2, and the ratio of the height h1 to the second distance h2 is 1.0-1.5:1.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] The sealing plug and valve proposed in the present invention can save materials and costs while ensuring sealing performance; can reduce leakage during long-term storage; and can reduce blockage caused by repeated use.

[0037] The sealing plug and valve described in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and will also be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] FIG1 is a front cross-sectional view of a sealing plug proposed by the present invention.

[0040] FIG2 is a front cross-sectional view of a sealing plug proposed by the present invention.

[0041] FIG3 is a front cross-sectional view of a valve proposed by the present invention.

[0042] FIG4 is a partial enlarged view of the area within circle A of a valve proposed by the present invention.

[0043] FIG5 is a front cross-sectional view of a sealing cup which is one of the components of a valve proposed by the present invention.

[0044] FIG6 is a front view of the plate body proposed in the present invention.

[0045] FIG7 is a front cross-sectional view of a valve stem, which is one of the components of a valve proposed by the present invention.

[0046] FIG8 is a graph showing the relationship between the gap space height and the inner wall surface area.

[0047] Figure 9 is a graph showing the corresponding changes in gap space height and annual liquid leakage.

[0048] FIG10 is a diagram showing a pressure test of a sealing cup, one of the components of a valve proposed by the present invention.

[0049] FIG11 is a diagram showing a pressure test of a sealing cup, one of the components of a valve proposed by the present invention.

[0050] FIG12 is a diagram showing a pressure test of a sealing cup, one of the components of a valve proposed by the present invention.

[0051] FIG13 is a diagram showing a pressure test of a sealing cup, one of the components of a valve proposed by the present invention. DETAILED DESCRIPTION

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0053] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0054] 1-13 , the present invention provides a valve, comprising: a sealing cup 1 , a sealing plug 2 , and a valve stem 3 .

[0055] The sealing cup 1 is a cup-shaped structure formed by connecting an annular side plate portion 11 and a bottom plate portion 12 . The annular side plate portion 11 forms the cup mouth of the sealing cup 1 , and the bottom plate portion 12 forms the cup wall and cup bottom of the sealing cup 1 . The sealing cup 1 is made of a thin-walled plate body 4. The sealing cup 1 has an outward-folded annular groove 111 at the cup mouth. The annular groove 111 can be assembled to the opening of a container and form a seal for the opening. The plate body 4 has a first inner surface 13 and a first outer surface 14. When the sealing cup 1 is assembled with the container, the first inner surface 13 is inside the container and the first outer surface 14 is outside the container. A first mounting hole 121 is provided at the center of the bottom plate portion 12. The bottom plate portion 12 has a first fold surrounding the first mounting hole 121. The first fold forms a first type of annular pressure groove 122 on the first inner surface 13-A of the bottom plate portion 12, and the first fold forms a first type of annular protrusion 123 on the first outer surface 14-A of the bottom plate portion 12; the bottom plate portion 12 has one or more surrounding first folds. The second fold forms a second type of annular groove 124 on the first inner surface 13-A of the bottom plate portion 12, and the second fold forms a corresponding second type of annular protrusion 125 on the first outer surface 14-A of the bottom plate portion 12; the first tube body portion 21 passes through the first mounting hole 121, and the upper surface of the flange portion 22 is in close contact with the first inner surface 13-A of the bottom plate portion 12, and the flange portion 22 is provided with a side of an annular flange (the surface of the annular flange is the first upper surface 221) and the geometric shape of the contact area between the first inner surface 13-A of the bottom plate portion 12 is matched to form a seal between the sealing cup 1 and the sealing plug 2, and the contact area between the side of the flange portion 22 with an annular flange and the first inner surface 13-A of the bottom plate portion 12 at least covers the first type of annular groove 122.

[0056] Combined with the connection relationship with the sealing plug 2, the existence of the first fold will undoubtedly enhance the sealing performance, and the existence of the second fold will not only enhance the pressure resistance of the sealing cup 1, but also, because the second fold does not come into contact with the sealing plug 2 as mentioned below, it will save materials to the greatest extent while ensuring the sealing performance and pressure resistance, thereby saving costs. For consumables that are mass-produced and not reused, saving a small amount of material will generate great market competitiveness.

[0057] When the thickness of the sealing cup 1 is 0.30 mm and the pressure environment is 1.2 MPa, the valve made of the sealing cup 1 is subjected to a pressure deformation test:

[0058] When the number of the first wrinkles and the second wrinkles are both zero, as shown in Figure 10 , the maximum deformation is 0.6791 mm;

[0059] When the number of first wrinkles is one and the number of second wrinkles is zero, as shown in Figure 11 , the maximum deformation is 0.3885 mm;

[0060] When the number of the first fold and the number of the second fold are both one, as shown in Figure 12 , the maximum deformation is 0.2910 mm;

[0061] When the number of the first fold is one and the number of the second fold is two, as shown in Figure 13 , the maximum deformation is 0.2142 mm;

[0062] Thus, increasing the number of first and second pleats significantly increases the strength of the resulting valve, thereby ensuring tightness and extending the life of the valve. It should be noted that, although only the first-type annular protrusions 123 and the second-type annular protrusions 125 are shown in Figures 10-13 , based on the above, the number of first pleats equals the number of first-type annular protrusions 123, and the number of second pleats equals the number of second-type annular protrusions 125, and so on.

[0063] The valve stem 3 includes a second tube body portion 31 and a seat body portion 32. The seat body portion 32 is connected to the second tube body portion 31. The second tube body portion 31 is axially provided with a central hole 3-A. One end of the central hole 3-A is open and the other end is blocked by the seat body portion 32. The second tube body portion 31 is provided with at least one lateral opening 3-B on the side close to the seat body portion 32. The lateral opening 3-B is connected with the central hole 3-A. The second tube body portion 31 is installed in the first hole section 2-A1 and the second hole section 2-A2. A seal is formed between the outer wall of the second tube body portion 31 and the inner wall of the first hole section 2-A1. The lateral opening 3-B is located in the second hole section 2-A2. When the valve stem 3 is in an unstressed state, the first annular bottom surface 222 of the flange portion 22 and the second upper surface 321 of the seat body portion 32 are tightly abutted to form a seal. The second hole section 2-A2 is in a compressed state. The height of the compressed second hole section 2-A2 is h1.

[0064] When the valve stem 3 is subjected to force, it moves downward, and the first annular abutment surface 3111 of the first annular protrusion 311 compresses the first annular top surface 211, placing the first tubular portion 21 in a compressed state. Furthermore, because the second annular abutment surface 2231 of the second annular protrusion 223 abuts the end surface of the first mounting hole 121 of the sealing cup 1, the compressed deformation region of the sealing plug 2, with the sealing cup 1 secured, is the portion between the first annular top surface 211 and the second annular abutment surface 2231 of the first tubular portion 21. As the valve stem 3 moves downward, the pressure exerted by the end surface of the seat portion 32 on the first annular bottom surface 222 decreases until the height of the compressed second hole section 2-A2 returns from h1 to its original height h3. The valve stem 3 is then pressed downward until the first annular bottom surface 222 separates from the end surface of the seat portion 32. At this point, the lateral opening 3-B communicates with the interior of the tank body, allowing gas or liquid within the tank body to enter the central hole 3-A through the lateral opening 3-B and ultimately be discharged outside the tank body.

[0065] After use, the valve stem 3 is no longer subjected to force. Under the action of the elastic force of the compression deformation area of ​​the sealing plug 2, the valve stem 3 moves upward and resets. The end face of the seat body 32 contacts the first annular bottom surface 222 and compresses and deforms the second hole section 2-A2 until the second hole section 2-A2 is compressed to a height of h1, thereby allowing the sealing plug 2 to seal the lateral opening 3-B.

[0066] As the gas or liquid in the tank is consumed, the pressure inside the tank will gradually decrease, and the height h1 of the second hole section 2-A2 after compression will also change (h1 gradually increases). Therefore, it should be ensured that when the pressure inside the tank is the same as the pressure outside the tank, the second hole section 2-A2 is still in a compressed state, and at least the height h1 of the second hole section 2-A2 after compression is ensured. <h3。

[0067] In FIG4 , h1 is the height of the second hole segment 2 - A2 after compression, h2 is the axial height (second distance) of the lateral opening 3 -B, and h3 is the uncompressed height of the second hole segment 2 - A2.

[0068] The sealing plug 2 includes a first tube body portion 21 and a flange portion 22. The flange portion 22 is connected to the first tube body portion 21. A first hole section 2-A1 is provided in the first tube body portion 21 and passes through the first tube body portion 21. A second hole section 2-A2 is provided in the flange portion 22 and passes through the flange portion 22. The second hole section 2-A2 is connected to the first hole section 2-A1 and is coaxially arranged. On the side where the flange portion 22 is connected to the first tube body portion 21, at least one annular flange coaxial with the second hole section 2-A2 is provided; the inner diameter of the second hole section 2-A2 is larger than the inner diameter of the first hole section 2-A1. As described in the previous paragraph, the second tube body portion 31 and the first hole segment 2-A1 are tightly fitted together to form a seal therebetween, and in the axial direction of the first hole segment 2-A1 or the second hole segment 2-A2, when the first hole segment 2-A1 and the second hole segment 2-A2 of equal length are compared, the volume of the first hole segment 2-A1 is smaller than the volume of the second hole segment 2-A2. It can be deduced that there is a gap between the inner wall of the second hole segment 2-A2 and the outer wall of the second tube body portion 31 of the valve stem 3.

[0069] After use, conventional valves retain some liquid within the central bore 3-A of the valve stem 3. This residual liquid can condense in the central bore 3-A and lateral opening 3-B, potentially blocking these openings. In the present invention, a gap is left between the inner wall of the second bore section 2-A2 and the outer wall of the second tubular portion 31 of the valve stem 3. This allows the residual liquid to flow back through the lateral opening 3-B into the gap, preventing clogging of the latter.

[0070] In the present invention, the inner diameter of the second hole segment 2-A2 at its junction with the first hole segment 2-A1 is smaller than the inner diameter of the second hole segment 2-A2 at its opening on the flange portion 22. Furthermore, the second hole segment 2-A2 may be a tapered hole. The angle a between the inner wall of the second hole segment 2-A2 and the horizontal plane is greater than a predetermined angle. The predetermined angle is between 80 and 87 degrees, preferably 80, 82, 85, or 87 degrees. When the sealing plug is connected to the valve stem, the first annular bottom surface 222 of the flange portion 22 contacts the seat portion 32. Because the angle between the inner wall surface of the second hole segment 2-A2 and the horizontal plane is less than 90 degrees and greater than a predetermined angle, the bottom of the flange portion 22 tends to turn outward or inward after contact with the seat portion 32. When the tendency to turn outward occurs, the end surface of the seat portion 32 causes a portion of the inner wall surface of the second hole segment 2-A2 to bend over to contact the seat portion 32, thereby increasing the contact area with the seat portion 32 and improving the sealing performance. When the tendency to turn inward occurs, the end surface of the seat portion 32 causes the outer wall surface of the second hole segment 2-A2 to bend over to contact the seat portion 32, thereby increasing the contact area with the seat portion 32 and improving the sealing performance. To facilitate the folding of the flange portion 22, the outer wall surface of the second hole segment 2-A2 and the first annular bottom surface 22 are typically inclined surfaces, as shown in Figure 3. When the above structure is adopted, the first annular bottom surface 222 forms a rib structure, similar to an annular protrusion, and the contact surface between the two is not a surface contact in the prior art. The rib structure or annular protrusion is more easily compressed and deformed, so that the sealing part of the flange portion 22 contacting the seat body portion 32 has a larger deformation, thereby achieving better sealing.

[0071] When the outer diameter of the annular groove 111 is 31.3 mm (with a tolerance of 0.1 mm), and / or the inner diameter is 25.4 mm (with a tolerance of 0.1 mm), the height of the second hole segment 2-A2 is 1.5 mm to 4 mm, and the height of the second hole segment 2-A2 is further preferably 1.5 mm; correspondingly, the inner wall surface area of ​​the second hole segment 2-A2 is preferably 27.6 mm 2 to 85.6mm 2 The inner wall surface area of ​​the second hole section 2-A2 is further preferably 27.6 mm 2 .

[0072] In the comparative test of the present invention, the outer diameter of the annular groove 111 was set to 31.30 mm and the inner diameter was set to 25.4 mm, corresponding to an outer diameter of the container mouth of 31.30 mm and an inner diameter of the container mouth of 25.4 mm. When the height of the second hole segment 2-A2 changes, the resulting changes in the inner wall surface area of ​​the second hole segment 2-A2 and the resulting changes in the annual leakage of the liquid in the container are as follows:

[0073] Figure 8 shows the change in the surface area of ​​the inner wall of the second hole segment 2-A2 when the height of the second hole segment 2-A2 changes. The horizontal axis is the height value in mm, and the vertical axis is the surface area of ​​the inner wall in mm. 2 .

[0074] FIG9 shows the corresponding change in annual liquid leakage when the height of the second hole section 2-A2 changes. The horizontal axis is the height value in mm, and the vertical axis is the annual leakage in g / year.

[0075] 8 and 9 , it can be seen that when the height of the second hole segment 2 - A2 is equal to 4 mm, there is an inflection point, at which the leakage begins to decrease unexpectedly, and reaches the lowest value when the height of the second hole segment 2 - A2 is reduced to 1.5 mm.

[0076] The main reason is that, based on the principle of like attracts like, small organic molecules within the container slowly seep out through the intermolecular gaps of the rubber sealing plug 2 and then through the second hole segment 2-A2. Simultaneously, water molecules from the outside world also slowly seep in, affecting the non-aqueous solution within the container. The speed of leakage is related to the internal surface area of ​​the sealing plug 2 within the second hole segment 2-A2. This internal surface is the leakage surface that communicates with the outside world. Due to the required liquid discharge rate of the valve during use, the axial height (i.e., the second distance) h2 of the lateral opening 3-B can only be reduced to 1.5mm to 4mm. Furthermore, to prevent clogging, the height of the lateral opening 3-B must be forcibly linked to the height h3 of the second hole segment 2-A2 (uncompressed), so the height h3 of the second hole segment 2-A2 cannot be reduced indefinitely. The height h3 of the second hole segment 2-A2 is greater than the second distance h2, and the ratio of the two is 1.0 to 1.5:1.

[0077] After the height of the second hole section 2-A2 is reduced to 1.5mm to 4mm, the surface area of ​​the inner wall of the sealing plug 2 in the second hole section 2-A2 is reduced to 27.6mm. 2 to 85.6mm 2 5 , the experimental results show that when the valve is sealed, the leakage of the liquid sealed in the container by the valve is disproportionately and significantly reduced beyond expectations.

[0078] When selecting 27.6mm 2 to 85.6mm 2 When the value is the lowest, the annual leakage is the lowest and the material is saved the most. For consumables that are mass-produced and not reused, saving a small amount of material will generate great market competitiveness.

[0079] In the present invention, a first annular protrusion 311 having a first annular abutment surface 3111 is extended from the outer wall of the second tube body portion 31, and the first annular top surface 211 forms a tight abutment with the first annular abutment surface 3111; a second annular protrusion 223 having a second annular abutment surface 2231 is extended from the flange portion 22, and the first mounting hole 121 of the sealing cup 1 forms a tight abutment with the second annular protrusion 223.

[0080] In the present invention, three lateral openings 3 -B communicating with the central hole 3 -A are usually provided on the side of the second tube portion 31 close to the seat portion 32 , and the three lateral openings 3 -B are arranged at equal angles.

[0081] In the present invention, the thickness of the plate body 4 is between 0.27 mm and 0.41 mm. More preferably, the thickness of the plate body 4 is between 0.27 mm and 0.31 mm. More preferably, the thickness of the plate body 4 is 0.30 mm.

[0082] In the present invention, the outer diameter of the annular groove 111 is specifically between 31.20 mm and 31.40 mm, preferably 31.3 mm. Preferably, the inner diameter of the annular groove 111 is specifically between 25.3 mm and 25.5 mm, preferably 25.4 mm.

[0083] Based on this, due to various enhancements, such as the increased compressive strength of the folds, the provision of gaps, and the minimization of the gap height, the present invention optimizes the material and thickness of the plate 4. Preferably, the plate 4 is made of tinplate with a hardness grade of T2, a hardness HR30T of 52, an elongation of 35%, a tensile strength of 340 MPa, and a yield strength of 245 MPa. The thickness of the plate 4 is between 0.27 mm and 0.41 mm, more preferably between 0.27 mm and 0.41 mm, more preferably between 0.27 mm and 0.34 mm, and even more preferably 0.30 mm. In other words, the thickness of the sealing cup 1 is minimized, saving material while still ensuring quality.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, and therefore should not be understood as limiting the present invention.

[0085] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0086] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A sealing plug, characterized in that, Comprising: A first tube body portion (21), within which a first hole section (2 - A1) passing through the first tube body portion (21) is provided; A flange portion (22), which is connected to the first tube body portion (21). A second hole section (2 - A2) passing through the flange portion (22) is provided within the flange portion (22). The second hole section (2 - A2) is in communication with the first hole section (2 - A1). On the side where the flange portion (22) is connected to the first tube body portion (21), at least one annular flange is provided.

2. The sealing plug according to claim 1, characterized in that, The inner diameter of the second hole section (2 - A2) is larger than the inner diameter of the first hole section (2 - A1).

3. The sealing plug according to claim 2, characterized in that, The inner diameter at the connection of the second hole section (2 - A2) and the first hole section (2 - A1) is smaller than the inner diameter at the opening of the second hole section (2 - A2) on the flange portion (22).

4. The sealing plug according to claim 3, characterized in that, The second hole section (2 - A2) is a conical hole.

5. The sealing plug according to claim 4, characterized in that, The included angle a between the inner wall surface of the second hole section (2 - A2) and the horizontal plane is greater than a preset angle.

6. The sealing plug according to claim 5, characterized in that, The preset angle is 80 - 87 degrees.

7. The sealing plug according to claim 1, wherein At least one annular protrusion is provided at the connection of the first hole section (2 - A1) and the second hole section (2 - A2).

8. The sealing plug according to claim 7, characterized in that, The height of the annular protrusion is equal to the minimum value of the difference between the inner diameters of the second hole section (2 - A2) and the first hole section (2 - A1).

9. The sealing plug according to claim 1, characterized in that, The inner wall surface area of the second hole section (2-A2) is 27.6 mm 2 - 85.6 mm 2 .

10. A valve stem, characterized in that, Comprising: A second tube body portion (31) and a seat body portion (32); The second tube body portion (31) has a middle hole (3 - A); The seat body portion (32) is connected to the second tube body portion (31). At least one lateral opening (3 - B) is provided on the side of the second tube body portion (31) close to the seat body portion (32). The lateral opening (3 - B) is in communication with the middle hole (3 - A).

11. The valve stem according to claim 10, characterized in that, A first annular protrusion (311) with a first annular abutting surface (3111) extends from the outer wall of the second tube body portion (31).

12. The valve stem according to claim 11, wherein, The lower end surface of the first annular protrusion (311) is spaced from the upper end surface of the seat body portion (32) by a first distance.

13. A valve, characterized in that, Comprising a valve stem, a sealing plug sleeved on the valve stem, and a sealing cup sleeved outside the sealing plug.

14. The valve according to claim 13, characterized in that, The bottom plate portion (12) of the sealing cup is sleeved on the first tube body portion (21). The side of the flange portion (22) with the annular flange abuts against the bottom plate portion (12), and the annular flange is located within a first - type annular pressing groove (122) of the bottom plate portion (12).

15. The valve according to claim 14, wherein The contact area between the flange portion (22) and the bottom plate portion (12) at least covers the first - type annular pressing groove (122).

16. The valve according to claim 13, wherein, A second annular protrusion (223) with a second annular abutting surface (2231) extends from the outer side wall of the first tube body portion (21). The end surface of the first mounting hole (121) on the bottom plate portion (12) forms a tight abutment with the second annular abutting surface (2231).

17. The valve according to claim 13, characterized in that, The second tube body portion (31) is installed within the first hole section (2 - A1) and the second hole section (2 - A2). A seal is formed between the outer wall of the second tube body portion (31) and the inner wall of the first hole section (2 - A1). The lateral opening (3 - B) is located within the second hole section (2 - A2). When the valve stem (3) is in an unloaded state, a tight abutment is formed between the first annular bottom surface (222) of the flange portion (22) and the second upper surface (321) of the seat body portion (32) to form a seal.

18. The valve according to claim 13, characterized in that, The end face of the first tube body portion (21) away from the flange portion (22) is the first annular top surface (211), and the first annular top surface (211) forms a tight abutment with the first annular abutting surface (3111).

19. The valve according to claim 13, characterized in that, The inner diameter of the first hole section (2-A1) is adapted to the outer diameter of the first distance section of the second tube body portion (31).

20. The valve according to claim 13, characterized in that, The height of the sealing plug is greater than the first distance.

21. The valve according to claim 13, characterized in that The difference between the height of the sealing plug and the first distance is equal to the height of the annular protrusion.

22. The valve according to claim 13, wherein The height of the lateral opening (3-B) along the axial direction is the second distance h2, and the height h3 of the second hole section (2-A2) is greater than the second distance h2.

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