Inverted quantitative valve

Abstract

The utility model relates to an inverted quantitative valve, in particular to a valve assembly which is suitable for distributing the metered dose of liquid medicine contained in an inhaled 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] The utility model relates to a kind of inverted quantitative valves, especially applicable to the valve assembly of the metered dose of liquid medicine contained in dispensing inhalation aerosol container. BACKGROUND

[0002] Aerosol valve is used with pressure container, which constitutes a sealed space to store liquid and suitable propellant. Due to the special nature of the propellant, the liquid stored inside can be sprayed out when in use, and it is widely used in daily chemical and pharmaceutical industries. Especially the quantitative valve, due to the quantitative chamber contained therein, ensures that the quantitative valve can accurately control the spray dose of aerosol, and is widely used in the field of inhalation aerosol.

[0003] Most of the quantitative aerosol valves on the market are made of plastic material to form the quantitative cavity base and valve stem. The quantitative cavity base and valve stem are the components most commonly subjected to internal spring pressure in inhalation aerosol products. Plastic material is relatively soft and prone to deformation, which ultimately leads to inaccurate dosing in the middle and late stages. Moreover, the quantitative cavity base and valve stem are in contact with the liquid medicine for a long time during the overall use cycle of the inhalation aerosol product. If plastic material is used to make the relevant structure, the impurities from the plastic material will enter the liquid medicine during this period, affecting the safety and efficacy of the liquid medicine.

[0004] In addition, most of the quantitative aerosol valves on the market place the spring in the quantitative chamber in the quantitative cavity base. The spring is soaked in the stored liquid for a long time, and its compression and expansion movement may affect the final quantitative accuracy.

[0005] At the same time, the existing quantitative valve also has the problem of excessive residual liquid. When the inhalation aerosol is about to be used up, there is still a large space to accumulate liquid between the liquid inlet hole of the quantitative cavity and the bottom end of the positioning cover in the quantitative cavity base. The liquid at this position cannot be discharged for use because it is lower than the liquid inlet hole of the quantitative cavity, causing a certain degree of liquid waste and increasing the cost of the pharmaceutical factory. The outer sealing ring in contact between the positioning cover and the inhalation aerosol pressure container is of an integrated structure and cannot form a tight wrap type seal with the mouth of the inhalation aerosol pressure container. SUMMARY

[0006] The main purpose of the utility model is to provide an inverted quantitative valve with a firm and stable structure, safe material and less liquid waste.

[0007] To achieve the above purpose, the utility model provides the following technical scheme: an inverted quantitative valve is used with 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 stem, wherein:

[0008] The quantitative cavity base is a stepped structure, from the opening end to the closed end, the quantitative cavity base is gradually narrowed, and a plurality of quantitative cavity liquid inlet holes are uniformly arranged on the transition platform between the narrowest section and the less narrow section of the quantitative cavity base in the circumferential direction, and the quantitative cavity liquid inlet hole is a longitudinal opening;

[0009] One end of the valve rod is an open structure as a valve rod liquid outlet hole, this end penetrates the positioning cover, the other end has a spring fixing column for fixing the spring, the middle section of the valve rod is provided with a ring of quantitative cavity sealing ring clamping table for fixing the quantitative cavity sealing ring, between the valve rod liquid outlet hole and the quantitative cavity sealing ring clamping table, a transverse non-through small hole is arranged on the valve rod as a valve rod liquid inlet hole;

[0010] The space between the inside of the quantitative cavity base and the valve rod is a quantitative cavity chamber;

[0011] The spring is placed at the narrowest position of the quantitative cavity base, and the total length of the spring is less than the distance from the inner wall of the closed end of the quantitative cavity base to the bottom surface of the spring fixing column of the valve rod;

[0012] Further, the quantitative cavity sealing ring is clamped on the valve rod, the valve rod is provided with the quantitative cavity sealing ring clamping table at a non-central position, and the valve rod is fixed by cooperating with the quantitative cavity sealing ring clamping table, the quantitative cavity sealing ring clamping table is located between the valve rod liquid inlet hole and the spring fixing end, the relative position of the quantitative cavity sealing ring and the valve rod is fixed, and the quantitative cavity sealing ring can move in the quantitative cavity chamber along the fixed direction.

[0013] Further, a ring of liquid discharge steps is arranged on the positioning cover, and the depth of the liquid discharge step is flush with the quantitative cavity liquid inlet hole.

[0014] Further, the width of the liquid discharge step is 3-6mm.

[0015] Preferably, the width of the liquid discharge step is preferably 4.4mm.

[0016] Further, 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, and the outer sealing ring forms a seal with the inhalation aerosol container.

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

[0018] Preferably, the cross-sectional shape of the outer sealing ring base is that one side closely abuts the inner wall of the positioning cover, and the other side has a certain arc to match the special shape of the outer sealing ring; or other special shapes that can match the outer sealing ring.

[0019] Further, the quantitative 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 quantitative cavity sealing ring, the inner sealing ring and the outer sealing ring base are made of rubber elastomer, elastic plastic material or injection elastic body, and the outer sealing ring is made of rubber material or injection elastic body with excellent sealing performance or elastic body with elastic performance.

[0020] Preferably, the outer sealing ring is made of rubber elastomer selected from butyl rubber, chloroprene rubber, nitrile rubber, ethylene-propylene-diene rubber and the rest of the main categories of rubber.

[0021] Preferably, the quantitative cavity sealing ring, the inner sealing ring and the outer sealing ring base are made of elastic plastic material selected from silica gel, polypropylene (PP), polyethylene (PE) or polyamide (Nylon).

[0022] Preferably, the quantitative cavity sealing ring, the inner sealing ring and the outer sealing ring base are made of injection elastic body selected from thermoplastic elastomer (TPE / TPR), thermoplastic vulcanized rubber (TPV), polytetrafluoroethylene rubber (PTFE) and the rest of the main categories of elastomer.

[0023] Further, the inner sealing ring has an overall special-shaped structure in cross section and can be divided into two sections, one of which is tightly matched with the quantitative cavity base and used for sealing the quantitative cavity base and the positioning cover, and the other section is relatively inwardly contracted as a whole and tightly matched with the valve rod and used for sealing the valve rod and the quantitative cavity chamber, wherein the surface in contact with the valve rod is completely smooth.

[0024] Further, the quantitative cavity base, the spring, the positioning cover and the valve rod are made of metal material.

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

[0026] Preferably, the dosing chamber base, the spring and the valve stem are made of a stainless steel material having a chemical composition in percentage by weight of C≤0.08%, Mn≤2%, P≤0.045%, S≤0.03%, Si≤1%, Cr 17.5-20%, Ni 8-11%;

[0027] or a chemical composition in percentage by weight of C≤0.25%, Mn≤2%, P≤0.045%, S≤0.03%, Si≤1.5%, Cr 24-26%, Ni 19-22%;

[0028] or a chemical composition in percentage by weight of C≤0.08%, Mn≤2%, P≤0.035%, S≤0.03%, Si≤1%, Cr 16-18.5%, Ni 10-14%, Mo 2-3%;

[0029] or a chemical composition in percentage by weight of C≤0.15%, Mn≤1%, P≤0.035%, S≤0.03%, Si≤1%, Cr 11.5-13.5%;

[0030] or a chemical composition in percentage by weight of C 0.16-0.25%, Mn≤1%, P≤0.04%, S≤0.03%, Si≤1%, Cr 12-14%, Ni≤0.75%;

[0031] or a chemical composition in percentage by weight of 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 a chemical composition in percentage by weight of 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] or a chemical composition in percentage by weight of 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%.

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

[0035] Compared with the prior art, the utility model has the following beneficial effects:

[0036] 1. Except for the sealing role of the elastomer, all the other parts are made of metal material, which is more solid than plastic material, and can avoid the problem of inaccurate dosing caused by deformation of the valve member during the service life of the inhalation aerosol product. Moreover, the metal material has better chemical stability, which can effectively avoid the problem of leachate caused by long-term immersion of the valve structure in the liquid medicine, and the whole is safer and more reliable.

[0037] 2. The spring is arranged outside the dosing chamber, and the liquid medicine in the dosing chamber will not be sandwiched between the spring gaps due to stretching or contraction of the spring during the dosing process, so as to ensure the dosing accuracy of the final dosing valve.

[0038] 3. The positioning cover adopts a special groove, which can maximize the retention of the liquid medicine in the inhalation aerosol pressure container above the liquid inlet hole of the dosing chamber, thereby greatly reducing the waste of the liquid medicine and improving the use rate of the liquid medicine in the product.

[0039] 4. The sealing element between the inhalation aerosol pressure container and the positioning cover adopts a separate structure, and during assembly, the opening of the pressure container is pressed between the outer sealing ring and the outer sealing ring base to form a tight wrapping type seal, wherein the outer sealing ring base is located inside the pressure container and contacts the liquid medicine, and the outer sealing ring is located outside the pressure container. The two can be made of different materials for cost reasons, and only the outer sealing ring base requires higher material safety. BRIEF DESCRIPTION OF DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0041] Figure 1 is a schematic view of the front cross section of the structure according to a preferred embodiment of the present application;

[0042] Figure 2 is a schematic view of the overall inclined surface according to a preferred embodiment of the present application;

[0043] Figure 3 is an exploded view of the structure according to a preferred embodiment of the present application;

[0044] Figure 4 is a top view of the inverted dosing valve according to a preferred embodiment of the present application;

[0045] Figure 5 is a schematic view of the cross section of the inner seal according to a preferred embodiment of the present application;

[0046] Figure 6 is a schematic view of the structure of the valve rod according to a preferred embodiment of the present application;

[0047] Figure 7 is a schematic view of the main section of the inverted metering valve in the normal state according to a preferred embodiment of the present application;

[0048] Figure 8 is a schematic view of the main section of the inverted metering valve in the spraying state according to a preferred embodiment of the present application;

[0049] Figure 9 is a schematic view of the main section of the inverted metering valve in the filling state according to a preferred embodiment of the present application;

[0050] Figure 10 is a schematic view of the main section of the inverted metering valve according to another preferred embodiment of the present application;

[0051] Wherein: 1 - metering cavity base, 2 - spring, 3 - metering cavity sealing ring, 4 - outer sealing ring, 5 - outer sealing ring base, 6 - inner sealing ring, 7 - positioning cover, 8 - valve stem, 9 - metering cavity chamber, 10 - liquid discharge step, 11 - metering cavity liquid inlet hole, 12 - spring fixing column, 13 - metering cavity sealing ring clamping table, 14 - valve stem liquid inlet hole, 15 - valve stem liquid outlet hole. DETAILED DESCRIPTION

[0052] The following description is provided to enable any person skilled in the art to practice the present application. The preferred embodiments described below are only examples of the present application, and other obvious modifications can be made by those skilled in the art.

[0053] Figures 1 to 9 A preferred embodiment of the inverted metering valve of the present application is shown, which adopts an outer sealing ring base 5 with a triangular cross-sectional shape. The same as the traditional structure, it also includes: metering cavity base 1, spring 2, metering cavity sealing ring 3, outer sealing ring 4, outer sealing ring base 5, inner sealing ring 6, positioning cover 7, valve stem 8, etc. structure. Among them:

[0054] Quantitative cavity base 1 is the core component of the whole inverted quantitative valve device, which is a stepped structure, divided into the narrowest section, the second narrowest section and the widest section. The narrowest section is closed, and the inner cavity of the narrowest section contains the spring 2 and part of the valve rod 8. The space between the second narrowest section and the valve rod 8 is the quantitative chamber 9, which is used for quantitative spraying of liquid medicine during use. The longest length of the spring 2 during use is less than the total length of the narrowest section, which ensures that the spring 2 is isolated from the quantitative chamber 9, and the movement of the spring 2 will not affect the quantitative function of the quantitative chamber 9. The transition platform between the narrowest section and the second narrowest section is uniformly provided with a plurality of longitudinal small holes in the circumferential direction, which are the quantitative cavity inlet holes 11, used for making the liquid medicine in the aerosol pressure container enter the quantitative chamber 9. The widest section is open, and this end is fixed with the inner sealing ring 6 in the innermost circle of the positioning cover 7. The innermost circle of the positioning cover 7 is a center opening structure, and the valve rod 8 penetrates the positioning cover 7 through the opening. At the same time, the inner sealing ring 6 is placed in the innermost circle of the positioning cover 6 and is sleeved on the valve rod 8 as a sealing component.

[0055] The outermost circle of the positioning cover 7 is used to place the outer sealing ring 4 and the outer sealing ring base 5. The outer sealing ring 4 and the outer sealing ring base 5 are used in contact with the opening of the inhalation aerosol pressure container. The outer sealing ring base 5 adopts a triangular cross-section structure. During assembly, the opening part of the inhalation aerosol container extrudes the outer sealing ring base 5 to make it deform, so that the opening part of the inhalation aerosol container enters the gap between the outer sealing ring 4 and the outer sealing ring base 5. When the assembly is completed, the outer sealing ring 4 is located outside the inhalation aerosol pressure container, and the outer sealing ring base 5 is located inside the inhalation aerosol pressure container and contacts with the liquid medicine. The two can tightly seal the opening of the inhalation aerosol pressure container, and have a better sealing effect. At the same time, since the outer sealing ring 4 does not contact with the internal liquid medicine, different materials can be used for the outer sealing ring base 5, which saves production cost.

[0056] A liquid discharge step 10 is arranged in the positioning cover 7, and the depth of the liquid discharge step 10 is flat with the height of the quantitative cavity inlet hole 11. At the same time, the width of the liquid discharge step 10 is preferably 4.4mm. The liquid medicine in the inhalation aerosol pressure container is retained as much as possible above the quantitative cavity inlet hole 11, so as to ensure that the liquid medicine can be used as much as possible when the liquid medicine in the inhalation aerosol pressure container is almost used up, and the final residual liquid medicine is reduced.

[0057] As shown in Figure 5 The cross-section of the inner sealing ring 6 is a whole special-shaped structure, which can be divided into two sections. One section is closely matched with the quantitative cavity base 1, which is used for sealing the quantitative cavity base 1 and the positioning cover 7. The other section is relatively contracted inward as a whole and closely matched with the valve rod 8, which is used for sealing the valve rod 8 and the quantitative chamber 9. The surface in contact with the valve rod 8 is completely smooth.

[0058] The valve stem 8 is threaded through the center opening of the innermost ring of the positioning cap 7 at one end, which is open and has a longitudinal opening as the valve stem liquid outlet hole 15; the other end is closed and has a small cylindrical column as the spring fixing column 12 for fixing the spring 2; a ring of protrusions is arranged on the middle section of the valve stem 8 as the metering cavity sealing ring clamping table 13 for fixing the metering cavity sealing ring 3, so that it moves during the use of the overall inhalation aerosol product; the outermost diameter of the metering cavity sealing ring 3 is smaller than that of the metering cavity 9; a transverse non-through small hole is also arranged on the valve stem 8 between the valve stem liquid outlet hole 15 and the metering cavity sealing ring clamping table 13 as the valve stem liquid inlet hole 14.

[0059] As shown in Figure 7 When the overall inverted metering valve is in a normal state, the spring 2 is not compressed, and it supports the valve stem 8 at the farthest position from the metering cavity base 1; at this time, the metering cavity sealing ring clamping table 13 on the valve stem 8 with the metering cavity sealing ring 3 is at the lowest position, the metering cavity liquid inlet hole 11 is not covered by the metering cavity sealing ring 3, and the liquid in the inhalation aerosol pressure container can easily enter the metering cavity 9 through the metering cavity liquid inlet hole 11 under the influence of gravity, and the metering cavity 9 is filled with liquid. The valve stem liquid inlet hole 15 on the valve stem 8 is located outside the metering cavity 9, and the liquid entering the interior of the metering cavity 9 will be stored quantitatively because there is no outlet.

[0060] As shown in Figure 8 When the overall inverted metering valve is in a normal state, the spring 2 is not compressed, and it supports the valve stem 8 at the farthest position from the metering cavity base 1; at this time, the metering cavity sealing ring clamping table 13 on the valve stem 8 with the metering cavity sealing ring 3 is at the lowest position, the metering cavity liquid inlet hole 11 is not covered by the metering cavity sealing ring 3, and the liquid in the inhalation aerosol pressure container can easily enter the metering cavity 9 through the metering cavity liquid inlet hole 11 under the influence of gravity, and the metering cavity 9 is filled with liquid. The valve stem liquid inlet hole 15 on the valve stem 8 is located outside the metering cavity 9, and the liquid entering the interior of the metering cavity 9 will be stored quantitatively because there is no outlet.

[0061] As shown in Figure 9As shown, when the inverted metering valve is in the filling state, the spring 2 is pressed to a certain extent, the valve rod 8 is located close to the metering cavity base 1, the metering sealing ring clamping table 13 on the valve rod 8 is located close to the gap of the metering cavity liquid inlet hole 11, the metering cavity liquid inlet hole 11 is not covered by the metering cavity sealing ring 3, and part of the valve rod liquid inlet hole 14 is located close to the narrow section of the inner sealing ring 6.

[0062] As shown in the drawings, the inverted metering valve of the utility model is in the filling state, the spring 2 is pressed to a certain extent, the valve rod 8 is located close to the metering cavity base 1, the metering sealing ring clamping table 13 on the valve rod 8 is located close to the gap of the metering cavity liquid inlet hole 11, the metering cavity liquid inlet hole 11 is not covered by the metering cavity sealing ring 3, and part of the valve rod liquid inlet hole 14 is located close to the narrow section of the inner sealing ring 6. Figure 10 As shown in the drawings, the inverted metering valve of the utility model is in the filling state, the spring 2 is pressed to a certain extent, the valve rod 8 is located close to the metering cavity base 1, the metering sealing ring clamping table 13 on the valve rod 8 is located close to the gap of the metering cavity liquid inlet hole 11, the metering cavity liquid inlet hole 11 is not covered by the metering cavity sealing ring 3, and part of the valve rod liquid inlet hole 14 is located close to the narrow section of the inner sealing ring 6.

[0063] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is only for the convenience of the simplified description of the utility model, and is not indicative or suggestive of the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, in the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0064] The basic principles, main features and advantages of the utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only the principles of the utility model. Without departing from the spirit and scope of the utility model, various changes and improvements can be made to the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

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 row of liquid discharge steps are arranged on the positioning cap, and the depth of the liquid discharge steps is flush with the dosing chamber liquid inlet holes. The width of the liquid discharge steps 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, 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. The cross section of the inner sealing ring is an overall special-shaped structure, which can be divided into two sections, one section is tightly fitted with the dosing chamber base for sealing the dosing chamber base and the positioning cap, and the other section is relatively inwardly contracted as a whole and tightly fitted with the valve stem for sealing the valve stem and the dosing chamber.

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 the following stainless steel metal materials: the chemical composition percentage content is 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%.

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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