Sealing plug and valve

Abstract

A sealing plug and a valve. The sealing plug (2) comprises: a first tube body portion (21), the first tube body portion being internally provided with a first hole section (2-A1) running through the first tube body portion; and an annular flange portion (22), the annular flange portion being connected to the first tube body portion, the annular flange portion being internally provided with a second hole section (2-A2) running through the annular flange portion, the second hole section and the first hole section being communicated and coaxially arranged, and the inner diameter of the second hole section being greater than that of the first hole section. According to the sealing plug and the valve, on the premise that the sealing performance is guaranteed, materials can be conserved, and costs can be saved; leakage during long-term preservation can be reduced; and blockage caused by repeated usage can be reduced.

Description

Sealing plug and valve

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 202410080300.9 filed on January 19, 2024, entitled “A Sealing Plug and Valve,” all disclosures of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present application relates to the field of sealing technology, 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

[0004] 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.

[0005] Contents of this application

[0006] In order to solve the technical problems existing in the background technology, the present application proposes a sealing plug and a valve.

[0007] A sealing plug proposed in this application comprises:

[0008] a first pipe body part, the first pipe body part having a first hole section penetrating the first pipe body part;

[0009] an annular flange portion, the annular flange portion is connected to the first tube body portion, a second hole section is provided in the annular flange portion and passes through the annular flange portion, the second hole section is connected to the first hole section and is coaxially arranged;

[0010] The inner diameter of the second hole section is greater than the inner diameter of the first hole section.

[0011] The cross-sectional area of ​​the second hole section uniformly expands in a direction away from the first hole section.

[0012] Among them, the inner wall surface area of ​​the second hole section is 27.6mm 2 -85.6mm 2 .

[0013] The present application provides a valve, comprising a sealing plug and further comprising:

[0014] The sealing cup is a cup-shaped structure formed by connecting an annular side plate portion and a bottom plate portion. The sealing cup is processed from a thin-walled plate body. The sealing cup has an outward-folded annular groove at the cup mouth. The annular groove can be assembled to the opening of a container and form a seal for the opening. The plate body has a first inner surface and a first outer surface. When the sealing cup and the container are assembled, the first inner surface is inside the container and the first outer surface is outside the container. A first mounting hole is provided at the center of the bottom plate portion. The bottom plate portion has a first fold surrounding the first mounting hole. The first fold forms a first type of annular pressure groove on the first inner surface of the bottom plate portion. The first fold is formed on the first outer surface of the bottom plate portion. A first type of annular protrusion should be formed; the bottom plate portion has one or more second folds surrounding the first folds, the second folds forming a second type of annular groove on the first inner surface of the bottom plate portion, and the second folds correspondingly forming a second type of annular protrusion on the first outer surface of the bottom plate portion; the first tube portion passes through the first mounting hole, the upper surface of the flange portion closely contacts the first inner surface of the bottom plate portion, the geometry of the contact area between the first upper surface of the flange portion and the first inner surface of the bottom plate portion matches to form a seal between the sealing cup and the sealing plug, and 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 groove;

[0015] The valve stem includes a second tube body portion and a seat body portion. The second tube body portion has a central hole. The seat body portion is connected to the second tube body portion. One end of the central hole is open, and the other end of the central hole is blocked by the seat body portion. The second tube body portion is provided with at least one lateral opening on a side close to the seat body portion. The lateral opening is connected to the central hole. 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. 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.

[0016] A first annular protrusion with a first annular abutment surface extends from the second tube body portion, and the first annular top surface forms a tight abutment with the first annular abutment surface; a second annular protrusion with a second annular abutment surface extends from the flange portion, and the first mounting hole of the sealing cup forms a tight abutment with the second annular protrusion.

[0017] The second tube portion is provided with three lateral openings connected to the central hole on one side close to the seat portion, and the three lateral openings are arranged at equal angles and intervals.

[0018] The thickness of the board is 0.27mm-0.41mm.

[0019] The thickness of the board is 0.27mm-0.31mm.

[0020] The outer diameter of the ring groove is 31.20mm-31.40mm.

[0021] The inner diameter of the ring groove is 25.3mm-25.5mm.

[0022] The sealing plug and valve proposed in this application can save materials and costs while ensuring sealing performance; can reduce leakage during long-term storage; and can reduce blockage caused by multiple uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a front cross-sectional view of a sealing plug proposed in the present application;

[0024] FIG2 is a front cross-sectional view of a sealing plug proposed in the present application;

[0025] FIG3 is a front cross-sectional view of a valve proposed in this application;

[0026] FIG4 is a partial enlarged view of the area within circle A of a valve proposed in this application;

[0027] FIG5 is a front cross-sectional view of a sealing cup, which is one of the components of a valve proposed in this application;

[0028] FIG6 is a front view of the plate body proposed in this application;

[0029] FIG7 is a front cross-sectional view of a valve stem, which is one of the components of a valve proposed in this application;

[0030] FIG8 is a graph showing the relationship between the gap space height and the inner wall surface area;

[0031] FIG9 is a graph showing the change in gap space height and annual liquid leakage;

[0032] FIG10 is a diagram showing a pressure test of a sealing cup, one of the components of a valve proposed in this application;

[0033] FIG11 is a diagram showing a pressure test of a sealing cup, one of the components of a valve proposed in this application;

[0034] FIG12 is a diagram showing a pressure test of a sealing cup, one of the components of a valve proposed in this application;

[0035] FIG13 is a diagram showing a pressure test of a sealing cup, one of the components of a valve proposed in this application. DETAILED DESCRIPTION

[0036] 1-13 , the present application proposes a valve, comprising: a sealing cup 1 , a sealing plug 2 , and a valve stem 3 .

[0037] 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 sealing cup 1 is processed from a thin-walled plate body 4. The sealing cup 1 has an outwardly 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 second folds surrounding the first fold, and the second folds are formed on the first inner surface 13-A of the bottom plate portion 12 A second type of annular groove 124 is formed, and a second fold forms a second type of annular protrusion 125 corresponding to 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. The geometric shape of the contact area between the first upper surface 221 of the flange portion 22 and 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. The contact area between the upper surface of the flange portion 22 and the first inner surface 13-A of the bottom plate portion 12 at least covers the first type of annular groove 122.

[0038] 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.

[0039] When the thickness of the sealing cup 1 is 0.30 mm and the pressure environment is 1.2 MPa, a pressure deformation test is performed on the valve made of the sealing cup 1. As shown in FIG10 , when the number of the first wrinkle and the number of the second wrinkle are both zero, the maximum deformation is 0.6791 mm; as shown in FIG11 , when the number of the first wrinkle is one and the number of the second wrinkle is both zero, the maximum deformation is 0.3885 mm; as shown in FIG12 , when the number of the first wrinkle is one and the number of the second wrinkle is both one, the maximum deformation is 0.2910 mm; as shown in FIG13 , when the number of the first wrinkle is one and the number of the second wrinkle is both two, the maximum deformation is 0.2142 mm. It should be added that although the first type annular protrusions 123 and the second type annular protrusions 125 are marked in FIG10-13 , based on the above, it can be seen that the number of the first wrinkles is equal to the number of the first type annular protrusions 123, and the number of the second wrinkles is equal to the number of the second type annular protrusions 125, and so on.

[0040] It can be seen from this that adding the first folds and the second folds will greatly increase the strength of the manufactured valve, thereby ensuring the sealing performance and the practical life of the valve.

[0041] The valve stem 3 includes a second tube body portion 31 and a seat body portion 32. The second tube body portion 31 has a central hole 3-A. The seat body portion 32 is connected to the second tube body portion 31. One end of the central hole 3-A is open, and the other end of the central hole 3-A 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 to 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.

[0042] The sealing plug 2 includes a first tube body portion 21 and an annular flange portion 22. A first hole section 2-A1 is provided in the first tube body portion 21 and passes through the first tube body portion 21. The annular flange portion 22 is connected to the first tube body portion 21. A second hole section 2-A2 is provided in the annular flange portion 22 and passes through the annular flange portion 22. The second hole section 2-A2 is connected to the first hole section 2-A1 and is coaxially arranged; the inner diameter of the second hole section 2-A2 is larger than the inner diameter of the first hole section 2-A1.

[0043] 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.

[0044] When a traditional valve is closed after use, a certain amount of liquid will remain and flow back through the hole 3-A in the valve stem 3 by its own weight, and stay at the side opening 3-B. Since the opening 3-B is connected to the outside, the residual liquid comes into contact with the outside, the solvent evaporates, and the solute is oxidized, which will condense at the opening 3-A and cause partial blockage of the opening 3-A or even complete blockage of multiple openings 3-A, making it impossible to use it later or the use effect is poor.

[0045] The valve proposed in this application leaves a gap between the inner wall of the second hole section 2-A2 and the outer wall of the second tube body portion 31 of the valve stem 3, so that the residual liquid can further pass through the opening 3-A and flow back into the gap, thereby preventing the lateral opening 3-A from being blocked.

[0046] In the present application, the cross-sectional area of ​​the second hole segment 2 - A2 is uniformly expanded in a direction gradually away from the first hole segment 2 - A1 . In other words, the gap is uniformly expanded in this direction.

[0047] When the above structure is adopted, the flange portion 22 contacts the seat portion 32 and forms a sealed first annular bottom surface 222, which can naturally form a rib structure, similar to an annular protrusion. 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 where the flange portion 22 contacts the seat portion 32 has a larger deformation, thereby achieving better sealing.

[0048] In this application, the inner wall surface area of ​​the second hole section 2-A2 is 27.6mm 2 and 85.6mm 2 Further, the inner wall surface area of ​​the second hole section 2-A2 is 27.6mm 2 .

[0049] 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 2The inner wall surface area of ​​the second hole section 2-A2 is further preferably 27.6 mm 2 .

[0050] In the present application, the following comparative test was conducted: 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 change in the surface area of ​​the inner wall of the second hole segment 2-A2 and the resulting change in the annual leakage of the liquid in the container.

[0051] 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 .

[0052] 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.

[0053] 8 and 9 , it can be concluded that when the height of the second hole segment 2 - A2 is equal to 4 mm, there is an inflection point. At this point, the leakage begins to decrease unexpectedly, and when the height of the second hole segment 2 - A2 is reduced to 1.5 mm, it reaches the lowest value.

[0054] The main reason is that, based on the principle of like attracts like, the small molecular organic matter in the container will slowly seep out through the molecular gap of the rubber sealing plug 2 and then through the second hole segment 2-A2. At the same time, external water molecules will also slowly penetrate, affecting the solution in the container whose solvent is not water. The speed of leakage is related to the inner surface area of ​​the sealing plug 2 in the second hole segment 2-A2. The inner surface is the leakage surface connected to the outside world. Due to the requirements of the liquid discharge rate of the valve when in use, the height of the lateral opening 3-A can only be reduced to 1.5mm to 4mm, and it is necessary to prevent blockage, so that the height of the lateral opening 3-A is forcibly linked to the height of the second hole segment 2-A2, and the height of the second hole segment 2-A2 cannot be reduced indefinitely.

[0055] 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 reduced beyond expectations.

[0056] When choosing 27.6mm 2to 85.6mm 2 After reaching the lowest value, not only the annual leakage is the lowest, but also 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.

[0057] In the present application, a first annular protrusion 311 having a first annular abutment surface 3111 extends from 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 extends 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.

[0058] In the present application, three lateral openings 3 -B communicating with the central hole 3 -A are provided on one 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.

[0059] In the present application, 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.

[0060] In the present application, 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.

[0061] 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 material and thickness of the plate 4 are optimized in this application. 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.

[0062] This application provides a sealing plug 2, comprising: a first tubular portion 21, having a first hole section 2-A1 extending therethrough; an annular flange portion 22, connected to the first tubular portion 21, having a second hole section 2-A2 extending therethrough; the second hole section 2-A2 being coaxially connected to the first hole section 2-A1; and the inner diameter of the second hole section 2-A2 being greater than the inner diameter of the first hole section 2-A1. The cross-sectional area of ​​the second hole section 2-A2 increases uniformly in a direction away from the first hole section 2-A1.

[0063] The inner wall surface area of ​​the second hole section 2-A2 is 27.6 mm 2 -85.6mm 2 Further preferably, the inner wall surface area of ​​the second hole section 2-A2 is 27.6 mm 2 .

[0064] As described above, 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.

[0065] When a traditional valve is closed after use, a certain amount of liquid will remain and flow back through the hole 3-A in the valve stem 3 by its own weight, and stay at the side opening 3-B. Since the opening 3-B is connected to the outside, the residual liquid comes into contact with the outside, the solvent evaporates, and the solute is oxidized, which will condense at the opening 3-A and cause partial blockage of the opening 3-A or even complete blockage of multiple openings 3-A, making it impossible to use it later or the use effect is poor.

[0066] The valve proposed in this application leaves a gap between the inner wall of the second hole section 2-A2 and the outer wall of the second tube body portion 31 of the valve stem 3, so that the residual liquid can further pass through the opening 3-A and flow back into the gap, thereby preventing the lateral opening 3-A from being blocked.

[0067] In the present application, the cross-sectional area of ​​the second hole segment 2 - A2 is uniformly expanded in a direction gradually away from the first hole segment 2 - A1 . In other words, the gap is uniformly expanded in this direction.

[0068] When the above structure is adopted, the flange portion 22 contacts the seat portion 32 and forms a sealed first annular bottom surface 222, which can naturally form a rib structure, similar to an annular protrusion. 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 where the flange portion 22 contacts the seat portion 32 has a larger deformation, thereby achieving better sealing.

[0069] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and the concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A sealing plug, comprising: A first tube body portion (21), in which a first hole section (2 - A1) penetrating through the first tube body portion (21) is provided; An annular flange portion (22), which is connected to the first tube body portion (21). A second hole section (2 - A2) penetrating through the annular flange portion (22) is provided in the annular flange portion (22). The second hole section (2 - A2) is communicated with the first hole section (2 - A1) and is coaxially arranged; The inner diameter of the second hole section (2 - A2) is larger than the inner diameter of the first hole section (2 - A1).

2. The sealing plug according to claim 1, wherein in the direction away from the first hole section (2 - A1), the cross-sectional area of the second hole section (2 - A2) uniformly expands.

3. The sealing plug according to claim 2, wherein the inner wall surface area of the second hole section (2-A2) is 27.6 mm 2 - 85.6 mm 2 .

4. A valve, comprising the sealing plug according to claim 1, further comprising: A sealing cup (1), which is a cup-shaped structure formed by connecting an annular side plate portion (11) and a bottom plate portion (12). The sealing cup (1) is formed by processing a thin wall plate body (4). An annular groove (111) is turned outwards at the cup mouth of the sealing cup (1). The annular groove (111) can be assembled to the open end of a certain container to block the open end. 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). A first fold is provided on the bottom plate portion (12) around 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) corresponding to the first outer surface (14 - A) of the bottom plate portion (12); One or more second folds are provided on the bottom plate portion (12) around the first fold. The second folds form a second type of annular pressure groove (124) on the first inner surface (13 - A) of the bottom plate portion (12), and the second folds form a second type of annular protrusion (125) corresponding to 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) at the bottom plate portion (12). The geometric shape of the contact area between the first upper surface (221) of the flange portion (22) and the first inner surface (13 - A) at the bottom plate portion (12) is matched to form a seal between the sealing cup (1) and the sealing plug (2). The contact area between the upper surface of the flange portion (22) and the first inner surface (13 - A) at the bottom plate portion (12) at least covers the first type of annular pressure groove (122); ​ The valve stem (3), the valve stem (3) includes a second pipe body portion (31) and a seat body portion (32). The second pipe body portion (31) has a middle hole (3-A). The seat body portion (32) is connected to the second pipe body portion (31). One end of the middle hole (3-A) is open, and the other end of the middle hole (3-A) is blocked by the seat body portion (32). At least one lateral opening (3-B) is provided on the side of the second pipe body portion (31) close to the seat body portion (32). The lateral opening (3-B) communicates with the middle hole (3-A). The second pipe 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 pipe 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 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.

5. The valve according to claim 4, wherein a first annular protrusion (311) having a first annular abutment surface (3111) extends from the second pipe body portion (31), and a tight abutment is formed between the first annular top surface (211) and the first annular abutment surface (3111); a second annular protrusion (223) having a second annular abutment surface (2231) extends from the flange portion (22), and a tight abutment is formed between the first mounting hole (121) of the sealing cup (1) and the second annular protrusion (223).

6. The valve according to claim 5, wherein three lateral openings (3-B) communicating with the middle hole (3-A) are provided on the side of the second pipe body portion (31) close to the seat body portion (32), and the three lateral openings (3-B) are arranged at equal angular intervals.

7. The valve according to claim 6, wherein the thickness of the plate body (4) is 0.27 mm - 0.41 mm.

8. The valve according to claim 7, wherein the thickness of the plate body (4) is 0.27 mm - 0.31 mm.

9. The valve according to claim 6, wherein the outer diameter of the annular groove (111) is 31.20 mm - 31.40 mm.

10. The valve according to claim 6, wherein the inner diameter of the annular groove (111) is 25.3 mm - 25.5 mm.

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