Inverted quantitative valve

Abstract

The invention relates to an inverted metering valve, in particular to a valve assembly suitable for dispensing the metered dose of a liquid medicine contained in an inhalation aerosol container. Comprising a quantitative cavity base, a spring, a quantitative cavity sealing ring, an outer sealing ring, an outer sealing ring base, an inner sealing ring, a positioning cover and a valve rod, and other components except the sealing rings are all made of metal materials. Wherein the space between the interior of the quantitative cavity base and the valve rod is a quantitative cavity, and the spring is placed outside the quantitative cavity and is prevented from being in contact reaction with internal liquid medicine; the quantitative cavity sealing ring is fixed on the valve rod, and the quantitative cavity sealing ring and the valve rod move synchronously to complete liquid feeding and liquid discharging of the quantitative cavity; a circle of liquid drainage step is arranged on the positioning cover, the depth of the liquid drainage step is flush with that of the liquid inlet hole of the quantitative cavity, the width of the liquid drainage step is widened, and when liquid medicine sucked into the aerosol container is about to be used up, excessive liquid medicine can be prevented to the maximum extent.

Description

Technical Field

[0001] This invention relates to an inverted metering valve, particularly suitable for valve assemblies that dispense metered doses of medication contained in inhaled aerosol containers. Background Technology

[0002] Aerosol valves are used in conjunction with pressure vessels to form a sealed space for storing liquid and a suitable propellant. During use, the special properties of the propellant allow the stored liquid to be sprayed out, making them widely used in the daily chemical and pharmaceutical industries. Metering valves, in particular, with their metering chambers, ensure accurate control of the aerosol dosage and are widely used in the field of inhaled aerosols.

[0003] Most commercially available metered-dose aerosol valves use plastic for the metering chamber base and valve stem. These components are the most frequently subjected to internal spring pressure in aerosol products. Plastic is relatively soft and easily deformed, ultimately leading to inaccurate dispensing in the later stages of use. Furthermore, the metering chamber base and valve stem are in prolonged contact with the medication throughout the entire lifespan of the aerosol product. If plastic is used for these structures, impurities leach from the plastic will enter the medication, affecting its safety and efficacy.

[0004] In addition, most metering aerosol valves on the market place the spring in the metering chamber of the metering chamber base. The spring is immersed in the stored liquid for a long time, and the compression and unfolding process of the spring may affect the final metering accuracy.

[0005] Meanwhile, existing metering valves also suffer from excessive residual medication. When the inhaled aerosol is about to run out, a significant amount of medication accumulates outside the metering chamber base, between the inlet of the metering chamber and the bottom of the positioning cap. This accumulated medication cannot be discharged because it is below the inlet of the metering chamber, resulting in medication waste and increased costs for pharmaceutical companies. Furthermore, the outer sealing ring between the positioning cap and the inhaled aerosol pressure vessel is often a one-piece structure, failing to form a tight, enveloping seal with the inhaled aerosol pressure vessel opening. Summary of the Invention

[0006] The main objective of this invention is to provide an inverted metering valve that is structurally robust and stable, made of safe materials, and does not easily lead to waste of the medicine, in order to address the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an inverted metering valve, used in conjunction with an inhalation aerosol container, comprising a metering chamber base, a spring, a metering chamber sealing ring, an outer sealing ring, an outer sealing ring base, an inner sealing ring, a positioning cap, and a valve stem, wherein:

[0008] The quantitative chamber base has a stepped structure, which gradually narrows from the open end to the closed end. Multiple quantitative chamber inlet holes are evenly arranged along the circumference on the transition platform between the narrowest and second narrowest sections of the quantitative chamber base. The quantitative chamber inlet holes are longitudinal openings.

[0009] One end of the valve stem is an open structure serving as the valve stem outlet hole, which passes through the positioning cover. The other end has a spring fixing post for fixing the spring. A metering chamber sealing ring holder is provided in the middle section of the valve stem for fixing the metering chamber sealing ring. Between the valve stem outlet hole and the metering chamber sealing ring holder, a transverse non-penetrating small hole is provided on the valve stem as the valve stem inlet hole.

[0010] The space between the inside of the metering chamber base and the valve stem is a metering chamber.

[0011] The spring is placed at the narrowest point of the metering chamber base, and the total length of the spring is less than the distance from the inner wall of the closed end of the metering chamber base to the bottom surface of the spring fixing post of the valve stem;

[0012] Furthermore, the metering chamber sealing ring is clamped on the valve stem, and a metering chamber sealing ring retainer is provided at a non-central position on the valve stem to cooperate and fix it with the valve stem. The metering chamber sealing ring retainer is located between the liquid inlet of the valve stem and the fixed end of the spring. The metering chamber sealing ring is fixed in relative position to the valve stem and can move along a fixed direction in the metering chamber.

[0013] Furthermore, the positioning cover is provided with a drainage step, the depth of which is level with the liquid inlet of the metering chamber.

[0014] Furthermore, the width of the drainage step ranges from 3 to 6 mm.

[0015] Preferably, the width of the drainage step is 4.4 mm.

[0016] Furthermore, the outer sealing ring and the outer sealing ring base are independent structures. The outer sealing ring and the outer sealing ring base are used together, and the outer sealing ring base is in contact with the internal liquid medicine. The outer sealing ring and the inhalation aerosol container form a seal.

[0017] Preferably, the outer sealing ring base has a triangular cross-sectional shape.

[0018] Preferably, the cross-sectional shape of the outer sealing ring base is such that one side is in close contact with the inner wall of the positioning cover, and the other side has a certain curvature to fit the irregular shape of the outer sealing ring; or other irregular shapes that can fit the outer sealing ring.

[0019] Furthermore, the metering cavity sealing ring, the inner sealing ring, the outer sealing ring, and the outer sealing ring base are made of the same or different materials. The metering cavity sealing ring, the inner sealing ring, and the outer sealing ring base are made of rubber elastomer, plastic material with a certain elasticity, or injection-molded elastomer. The outer sealing ring is made of rubber material, injection-molded elastomer with good sealing performance, or other elastomers.

[0020] Preferably, the outer sealing ring is made of a rubber elastomer selected from the following: butyl rubber, chloroprene rubber, nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and other major types of rubber.

[0021] Preferably, the metering cavity sealing ring, the inner sealing ring, and the outer sealing ring base are all made of a plastic material with a certain degree of elasticity selected from the following: silicone, polypropylene (PP), polyethylene (PE), or polyamide (Nylon).

[0022] Preferably, the metering cavity sealing ring, the inner sealing ring, and the outer sealing ring base are all made of injection-molded elastomers selected from the following: thermoplastic elastomers (TPE / TPR), thermoplastic vulcanizates (TPV), polytetrafluoroethylene rubber (PTFE), and other major types of elastomers.

[0023] Furthermore, the inner sealing ring has an integral irregular structure in cross-section, which can be divided into two sections. One section fits tightly with the metering chamber base for sealing the metering chamber base and the positioning cover. The other section is relatively integrally contracted inward to fit tightly with the valve stem for sealing the valve stem and the metering chamber. The surface in contact with the valve stem is complete and smooth.

[0024] Furthermore, the metering chamber base, the spring, the positioning cover, and the valve stem are all made of metal.

[0025] Preferably, the positioning cover is made of aluminum alloy or stainless steel material selected from the following: aluminum alloy series commonly referred to as 3003, conforming to ISO standard AlMn1Cu or other equivalent standards of various countries; aluminum alloy series commonly referred to as 5052, conforming to ISO standard AlMg2.5 or other equivalent standards of various countries; aluminum alloy series commonly referred to as 5005, conforming to ISO standard AlMg1(B) or other equivalent standards of various countries; aluminum alloy series commonly referred to as 5657, conforming to national standard 5657-H112 or other equivalent standards of various countries; stainless steel series commonly referred to as 304, conforming to national standard 06Cr19Ni10 or other equivalent standards of various countries; and stainless steel series commonly referred to as 316, conforming to national standard 0Cr17Ni12Mo2 or other equivalent standards of various countries.

[0026] Preferably, the metering chamber base, the spring, and the valve stem are composed of materials with the following chemical composition percentages: C≤0.08%, Mn≤2%, P≤0.045%, S≤0.03%, Si≤1%, Cr 17.5-20%, and Ni 8-11%.

[0027] Or, the percentage content of chemical components is C≤0.25%, Mn≤2%, P≤0.045%, S≤0.03%, Si≤1.5%, Cr 24-26%, Ni 19-22%;

[0028] Or, the percentage content of chemical components is C≤0.08%, Mn≤2%, P≤0.035%, S≤0.03%, Si≤1%, Cr16-18.5%, Ni10-14%, Mo2-3%;

[0029] Or, the percentage content of chemical components is C≤0.15%, Mn≤1%, P≤0.035%, S≤0.03%, Si≤1%, and Cr11.5-13.5%;

[0030] Or, the chemical composition percentages are: C 0.16-0.25%, Mn≤1%, P≤0.04%, S≤0.03%, Si≤1%, Cr 12-14%, Ni≤0.75%;

[0031] Or, the percentage content of chemical components is C≤0.12%, Mn≤1%, P≤0.04%, S≤0.03%, Si≤ 0.75%, Cr 16-18%, Ni≤0.6%, Mo 2-3%;

[0032] Or, the chemical composition percentage is C≤0.15%, Mn 5.5-7.5%, P≤0.06%, S≤0.03%, Si≤0.075%, Cr 16-18%, Ni 3.5-5.5%, N≤0.25%;

[0033] It is made of stainless steel metal material with a chemical composition percentage of C 0.02-0.05%, Mn 1-2%, Si 1-2%, Cr 19-23%, Ni 23-28%, Mo 4-5%, Fe 45-55%, and Cu 1-2%.

[0034] Preferably, a coating is formed on all or part of the surfaces of the metering chamber base, the spring, the positioning cover, and the valve stem, wherein the coating comprises polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), polyester resin (PET), or a mixture thereof.

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

[0036] 1. Except for the elastic body that provides a seal, the entire body is made of metal, which is more robust than plastic and avoids the problem of inaccurate dosing caused by valve component deformation during the production cycle of inhaled aerosol products. Furthermore, metal materials have better chemical stability, effectively preventing leachate problems caused by prolonged contact between the valve structure and the liquid during use, making the overall product safer and more reliable.

[0037] 2. The spring is located outside the metering chamber, so that the liquid medicine in the metering chamber will not be trapped in the spring gap due to the stretching or contraction of the spring during the metering process, thus ensuring the metering accuracy of the final metering valve.

[0038] 3. The positioning cap uses a special groove to retain the liquid in the inhaled aerosol pressure container above the liquid inlet of the metering chamber to the maximum extent, which greatly reduces the waste of liquid and improves the utilization rate of the liquid in the product.

[0039] 4. The seal between the inhalation aerosol pressure vessel and the positioning cap adopts a separate structure. During the assembly process, the pressure vessel opening will be squeezed between the outer sealing ring and the outer sealing ring base to form a tight wrap-around seal. The outer sealing ring base is located inside the pressure vessel and is in contact with the liquid, while the outer sealing ring is located outside the pressure vessel. Due to cost reasons, the two can be made of different materials, only the material required for the outer sealing ring base needs to be of high safety. Attached Figure Description

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, wherein:

[0041] Figure 1 This is a front cross-sectional view of a preferred embodiment of the structure according to the present invention;

[0042] Figure 2 This is a schematic diagram of the overall inclined plane according to a preferred embodiment of the present invention;

[0043] Figure 3 This is an exploded view of a preferred embodiment of the present invention;

[0044] Figure 4 This is a top view of an inverted metering valve according to a preferred embodiment of the present invention;

[0045] Figure 5 This is a cross-sectional schematic diagram of the inner seal according to a preferred embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the valve stem according to a preferred embodiment of the present invention;

[0047] Figure 7 This is a front cross-sectional view of an inverted metering valve in its normal state according to a preferred embodiment of the present invention;

[0048] Figure 8 This is a front cross-sectional view of an inverted metering valve in the injection state according to a preferred embodiment of the present invention;

[0049] Figure 9 This is a front cross-sectional view of an inverted metering valve in the filling state according to a preferred embodiment of the present invention;

[0050] Figure 10 This is a front cross-sectional view of a structure according to another preferred embodiment of the present invention;

[0051] Wherein: 1-Quantitative chamber base, 2-Spring, 3-Quantitative chamber sealing ring, 4-Outer sealing ring, 5-Outer sealing ring base, 6-Inner sealing ring, 7-Positioning cover, 8-Valve stem, 9-Quantitative chamber, 10-Drainage step, 11-Quantitative chamber inlet, 12-Spring fixing post, 13-Quantitative chamber sealing ring holder, 14-Valve stem inlet, 15-Valve stem outlet. Detailed Implementation

[0052] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0053] Figures 1 to 9 This illustration shows a preferred embodiment of the inverted metering valve of the present invention, which employs an outer sealing ring base 5 with a triangular cross-sectional shape. Similar to conventional structures, it also includes: a metering chamber base 1, a spring 2, a metering chamber sealing ring 3, an outer sealing ring 4, an outer sealing ring base 5, and an inner sealing ring 6. Positioning cover 7, valve stem 8, and other structural components. Among them:

[0054] The metering chamber base 1 is the core component of the overall inverted metering valve device. It has a stepped structure, divided into a narrowest section, a second narrowest section, and a widest section. The narrowest section has a closed opening, housing the spring 2 and part of the valve stem 8. The space between the spring 2 and the valve stem 8 in the second narrowest section forms the metering chamber 9, used for metering the sprayed liquid during use. The longest possible length of the spring 2 during use is less than the total length of the narrowest section, ensuring isolation between the spring 2 and the metering chamber 9. The movement of the spring 2 will not affect the flow of liquid within the metering chamber 9. Quantitative function; multiple longitudinal holes are evenly arranged along the circumference on the transition platform between the narrowest and second narrowest sections, which are the liquid inlet holes 11 of the quantitative chamber, used to allow the liquid contained in the inhaled aerosol pressure container to enter the quantitative chamber 9; the opening of the thickest section is an open structure, and this end is fixed in the innermost ring of the positioning cover 7 in cooperation with the inner sealing ring 6. The innermost ring of the positioning cover 7 is a central opening structure, and the valve stem 8 passes through the positioning cover 7 through the opening. At the same time, the inner sealing ring 6 is placed in the innermost ring of the positioning cover 6 as a sealing component and is sleeved on the valve stem 8.

[0055] The outermost ring of the positioning cap 7 is used to house the outer sealing ring 4 and the outer sealing ring base 5. The outer sealing ring 4 and the outer sealing ring base 5 work together to contact the opening of the inhalation aerosol pressure container. The outer sealing ring base 5 has a triangular cross-section. During assembly, the opening of the inhalation aerosol container squeezes the outer sealing ring base 5, causing it to deform and allowing the opening of the inhalation aerosol container to enter the gap between the outer sealing ring 4 and the outer sealing ring base 5. When assembly is complete, the outer sealing ring 4 is located outside the inhalation aerosol pressure container, while the outer sealing ring base 5 is located inside the inhalation aerosol pressure container and in contact with the liquid. The two together reinforce and seal the opening of the inhalation aerosol pressure container, achieving a better sealing effect. At the same time, since the outer sealing ring 4 does not contact the internal liquid, it can be made of a different material than the outer sealing ring base 5, saving production costs.

[0056] The positioning cover 7 is provided with a drainage step 10. The depth of the drainage step 10 is at the same height as the liquid inlet 11 of the metering chamber. At the same time, the width of the drainage step 10 is preferably 4.4 mm. This keeps the liquid in the inhalation aerosol pressure container above the liquid inlet 11 as much as possible, ensuring that the liquid in the inhalation aerosol pressure container can be used as much as possible when there is not much liquid left, thus reducing the final liquid residue.

[0057] like Figure 5 As shown, the inner sealing ring 6 has an integral irregular structure in cross section, which can be divided into two sections. One section fits tightly with the bottom of the metering chamber 1 and is used to seal the metering chamber base 1 and the positioning cover 7. The other section shrinks inward relative to the whole and fits tightly with the valve stem 8 and is used to seal the valve stem 8 and the metering chamber 9. The surface in contact with the valve stem 8 is complete and smooth.

[0058] One end of the valve stem 8 passes through the innermost center opening of the positioning cover 7. This end is an open structure with a longitudinal opening serving as the valve stem outlet hole 15. The other end is a closed structure with a three-dimensional small cylinder serving as a spring fixing post 12 to fix the spring 2. A raised ring is provided in the middle section of the valve stem 8 as a metering chamber sealing ring holder 13 to fix the metering chamber sealing ring 3, allowing it to move during the use of the entire inhalation aerosol product. The outermost diameter of the metering chamber sealing ring 3 is smaller than the outermost diameter of the metering chamber 9. Between the valve stem outlet hole 15 and the metering chamber sealing ring holder 13, a transverse non-penetrating small hole is also provided on the valve stem 8 as the valve stem inlet hole 14.

[0059] like Figure 7 As shown, when the inverted metering valve is in its normal state, the spring 2 is not compressed, and its supporting valve stem 8 is at its furthest position from the metering chamber base 1. At this time, the metering chamber sealing ring holder 13 on the valve stem 8, along with the metering chamber sealing ring 3, is in its lowest position. The metering chamber inlet hole 11 is not covered by the metering chamber sealing ring 3. The liquid inhaled from the aerosol pressure vessel can easily enter the metering chamber 9 through the metering chamber inlet hole 11 under the influence of gravity, and fill the metering chamber 9. However, the valve stem inlet hole 15 on the valve stem 8 is located outside the metering chamber 9, and the liquid entering the metering chamber 9 will be stored quantitatively because there is no outlet.

[0060] like Figure 8 As shown, when the inverted metering valve is in the spraying state, the spring 2 is compressed, and the valve stem 8 is located at the position closest to the metering chamber base 1. At this time, the metering chamber sealing ring holder 13 on the valve stem 8, with the metering chamber sealing ring 3, is in the highest position, and the metering chamber inlet hole 11 is covered by the metering chamber sealing ring 3. Since there is a gap between the metering chamber sealing ring 3 and the outer wall of the metering chamber 9, the liquid medicine stored inside the metering chamber 9 can flow freely in the metering chamber 9 through this gap under normal conditions, and is still located inside the metering chamber 9. Under normal conditions, the metered liquid medicine will not be squeezed out of the metering chamber 9, and the dosage is not changed by the operation of the device. At this time, the valve stem inlet hole 14 enters the metering chamber 9, and the liquid medicine inside the metering chamber 9 flows into the internal space of the valve stem 8 through the valve stem inlet hole 14, and is then discharged through the valve stem outlet hole 15.

[0061] like Figure 9As shown, when the inverted metering valve is in the filling state, the spring 2 is compressed to a certain extent, and the valve stem 8 is located close to the metering chamber base 1. At this time, the metering sealing ring holder 13 on the valve stem 8, with the metering sealing ring 3, is located in a position where there is still a gap between it and the metering chamber inlet hole 11. The metering chamber inlet hole 11 is not covered by the metering chamber sealing ring 3, while part of the valve stem inlet hole 14 is located in a narrower section with the inner sealing ring 6. In the filling state, the entire metering valve is in the upright state. The liquid flows into the metering chamber 9 through the valve stem outlet hole 15 and then through the valve stem inlet hole 14. Part of the valve stem inlet hole 14 is covered by the inner sealing ring 6, but since this covered part is a narrow section, this covered part can be flushed open by the liquid. At this time, the metering chamber inlet hole 11 is also not covered, and the liquid can enter the inhalation aerosol pressure container through the metering chamber inlet hole 11, making the entire filling process smooth and feasible.

[0062] like Figure 10 The figure shows another preferred embodiment of the inverted metering valve of the present invention. Compared with the preferred embodiment described above, this preferred embodiment uses an irregularly shaped outer sealing ring base 5 with one side tightly attached to the inner wall of the positioning cover and the other side having a certain curvature, which is used to fasten the outer sealing ring and cooperate with the outer sealing ring 4 to complete the sealing of the opening of the inhalation aerosol pressure container.

[0063] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are merely for the convenience of simplifying the description of this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An inverted dosing valve, used in cooperation with an inhalation aerosol container, comprising a dosing chamber base, a spring, a dosing chamber sealing ring, an outer sealing ring, an outer sealing ring base, an inner sealing ring, a positioning cap and a valve stem, wherein: the dosing chamber base is a stepped structure, from the open end to the closed end, the width gradually decreases, a plurality of dosing chamber liquid inlet holes are uniformly arranged on the transition platform between the narrowest section and the second narrowest section of the dosing chamber base in the circumferential direction, and the dosing chamber liquid inlet holes are longitudinal openings; one end of the valve stem is an open structure as a valve stem liquid outlet hole, this end penetrates the positioning cap, the other end has a spring fixing column for fixing the spring, and a transverse non-penetrating small hole is arranged on the valve stem at a non-central position as a valve stem liquid inlet hole; the space between the inside of the dosing chamber base and the valve stem is a dosing chamber; the spring is placed at the narrowest position of the dosing chamber base, and the total length of the spring is less than the distance from the inner wall of the closed end of the dosing chamber base to the bottom surface of the spring fixing column of the valve stem; characterized in that the dosing chamber sealing ring is clamped on the valve stem, the valve stem is provided with a dosing chamber sealing ring clamping table at a non-central position, the dosing chamber sealing ring clamping table is fixed with the valve stem, the dosing chamber sealing ring clamping table is located between the valve stem liquid inlet hole and the spring fixing end, the relative position of the dosing chamber sealing ring and the valve stem is fixed, and the dosing chamber sealing ring can move in the fixed direction in the dosing chamber. a liquid discharge step is arranged on the positioning cap, and the depth of the liquid discharge step is level with the dosing chamber liquid inlet hole. The width of the liquid discharge step is in the range of 3-6 mm. The outer sealing ring and the outer sealing ring base are independent structures, the outer sealing ring base is in contact with the internal liquid medicine when the outer sealing ring and the outer sealing ring base are used in cooperation, and the outer sealing ring forms a seal with the inhalation aerosol container. The dosing chamber sealing ring, the inner sealing ring, the outer sealing ring and the outer sealing ring base are made of the same or different materials, the dosing chamber sealing ring, the inner sealing ring and the outer sealing ring base are made of a plastic material with a certain elasticity or an injection molded elastomer, and the outer sealing ring is made of a rubber material or an injection molded elastomer or other elastomers with good sealing performance. The cross section of the inner sealing ring is an overall special-shaped structure, which can be divided into two sections, one of which is tightly matched with the dosing chamber base and is used for sealing the dosing chamber base and the positioning cap, and the other section is relatively inwardly contracted as a whole and is tightly matched with the valve stem and is used for sealing the valve stem and the dosing chamber, wherein the surface in contact with the valve stem is complete and smooth.

2. The inverted dosing valve according to claim 1, characterized in that The dosing chamber base, the spring, the positioning cap and the valve stem are all made of metal materials.

3. The inverted dosing valve according to claim 2, characterized in that The positioning cap is made of aluminum alloy or stainless steel material.

4. The inverted dosing valve of claim 1, wherein, The dosing chamber base, the spring and the valve stem are made of a material with a chemical composition percentage content of C≤0.08%, Mn≤2%, P≤0.045%, S≤0.03%, Si≤1%, Cr 17.5-20%, and Ni 8-11%.

5. The inverted dosing valve of claim 4, wherein, ​ 6. The inverted dosing valve of claim 1, wherein, ​ 7. The inverted dosing valve of claim 1, wherein, ​ 8. The inverted dosing valve of claim 7, wherein, ​ 9. The inverted dosing valve of claim 7, wherein, ​ or chemical composition percentage content C≤0.25%, Mn≤2%, P≤0.045%, S≤0.03%, Si≤1.5%, Cr 24-26%, Ni 19-22%; or chemical composition percentage content C≤0.08%, Mn≤2%, P≤0.035%, S≤0.03%, Si≤1%, Cr 16-18.5%, Ni 10-14%, Mo 2-3%; or chemical composition percentage content C≤0.15%, Mn≤1%, P≤0.035%, S≤0.03%, Si≤1%, Cr 11.5-13.5%; or chemical composition percentage content C 0.16-0.25%, Mn≤1%, P≤0.04%, S≤0.03%, Si≤1%, Cr 12-14%, Ni≤0.75%; or chemical composition percentage content C≤0.12%, Mn≤1%, P≤0.04%, S≤0.03%, Si≤0.75%, Cr 16-18%, Ni≤0.6%, Mo 2-3%; or chemical composition percentage content C≤0.15%, Mn 5.5-7.5%, P≤0.06%, S≤0.03%, Si≤0.075%, Cr 16-18%, Ni 3.5-5.5%, N≤0.25%; or chemical composition percentage content C 0.02-0.05%, Mn 1-2%, Si 1-2%, Cr 19-23%, Ni 23-28%, Mo 4-5%, Fe 45-55%, Cu 1-2% stainless steel metal material.

10. Inverted dosing valve according to claim 8 or 9, characterized in that All or part of the surface of the quantitative cavity base, the spring, the positioning cover and the valve stem is formed with a coating, wherein the coating comprises polytetrafluoroethylene or fluorinated ethylene propylene copolymer or polyester resin or a mixture thereof.

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