Binary packaging proportional valve

Abstract

The utility model discloses a binary package proportional valve which comprises a sealing cup capable of being connected to an aerosol tank, a valve body is arranged on the sealing cup, a main cavity and a discharging cavity are formed in the valve body, a piston is arranged in the main cavity in a relative sliding mode and divides the main cavity into an air inlet cavity and a quantitative cavity in an up-down mode, and a liquid inlet channel communicated with the quantitative cavity and a bag is arranged in the valve body. A valve rod with the upper end penetrating out of the sealing cup and the lower end penetrating through the piston in a sliding mode is arranged in the valve body in a relative sliding mode, and a communicating channel communicating with the quantitative cavity and the discharging cavity and a discharging channel capable of communicating with the discharging cavity after the valve rod slides downwards are arranged in the valve rod. When the valve rod slides downwards to enable the lower end of the valve rod to close the liquid inlet channel and enable the discharging channel to be communicated with the discharging cavity, the quantitative cavity is communicated with external air through the communicating channel, so that compressed air enters the air inlet cavity from the aerosol tank to push the piston downwards to push liquid in the quantitative cavity to the discharging channel. A first elastic piece capable of elastically pressing the valve rod to reset is arranged in the discharging cavity, and a second elastic piece capable of elastically pressing the piston to reset is arranged in the quantitative cavity.

Description

Technical Field

[0001] The utility model relates to a binary-packaging metering valve.

Background Art

[0002] An aerosol valve is an important component in aerosol products. It is installed on an aerosol can to form a sealed space, encapsulating the content and a suitable propellant inside. When in use, the aerosol valve is actuated to eject the content. As a special aerosol valve, a metering valve can precisely control the flow rate released by the fluid source each time, and it has a very wide range of applications in industries such as daily chemicals and pharmaceuticals.

[0003] Currently, most of the commonly used metering valves on the market are single-component aerosol metering valves. The reason why a single-component aerosol metering valve can be metered is that it has a metering chamber and the metering chamber contains a two-phase content, that is, the solution and the propellant coexist. When the valve is opened, the propellant in the metering chamber can push the liquid out. The above single-component aerosol metering valve needs to consider the compatibility problem of the propellant mixture solution and is not very suitable for products with high safety and hygiene standards such as pharmaceuticals and foods. In order to prevent the ejected aerosol from mixing with the propellant and the propellant from being ejected, some binary-packaging valves have emerged on the market. For example, as disclosed in the Chinese patent with the application number CN202020926638.9 and the name of a metering binary-packaging aerosol valve, it includes a valve stem, an inner gasket, a fixed cap, a spring, a metering chamber, a one-way valve, a valve chamber, a connector, a liquid guide tube, and a sachet. Although the solution of this type of binary-packaging sachet valve is independently packaged in the sachet, the content in the metering chamber is single-phase, only the solution, and kinetic energy is required for pushing. At this time, the user needs to press the valve stem with effort to push the aerosol in the metering chamber out through the aerosol nozzle at the upper end of the valve stem, which is rather inconvenient to use.

[0004] Therefore, the present utility model is precisely generated based on the above deficiencies.

Content of the Utility Model

[0005] The purpose of the present utility model is to overcome the deficiencies of the prior art and provide a binary-packaging metering valve with a simple structure and convenient use.

[0006] The present utility model is realized through the following technical solutions:

[0007] A two-component packaging metering valve, characterized in that: it includes a sealing cup 1 that can be hermetically connected to an aerosol can filled with compressed gas. A valve body 2 is provided on the sealing cup 1. A main chamber 21 and a discharge chamber 22 are provided in the valve body 2. A piston 3 is slidably disposed in the main chamber 21. The piston 3 divides the main chamber 21 into an upper and a lower part, an intake chamber 211 communicating with the aerosol can and a metering chamber 212 capable of storing a certain amount of liquid. An inlet channel 23 communicating the metering chamber 212 with a sachet and allowing liquid to enter the metering chamber 212 is provided in the valve body 2. A valve rod 4 is slidably disposed in the valve body 2, with its upper end passing through the sealing cup 1 and its lower end slidably passing through the piston 3. A communication channel 41 communicating the metering chamber 212 with the discharge chamber 22 and a discharge channel 42 capable of communicating the discharge chamber 22 for liquid to flow out after the valve rod 4 slides downward are provided in the valve rod 4. When the valve rod 4 slides downward so that the lower end of the valve rod 4 closes the inlet channel 23 and allows the discharge channel 42 to communicate with the discharge chamber 22, the metering chamber 212 communicates with the external air through the communication channel 41, so that the compressed gas enters the intake chamber 211 from the aerosol can and pushes the piston 3 downward to squeeze the liquid in the metering chamber 212 into the discharge channel 42. A first elastic member 5 capable of elastically pressing the valve rod 4 to reset upward to close the discharge channel 42 from the discharge chamber 22 and simultaneously open the inlet channel 23 is provided in the discharge chamber 22. A second elastic member 50 capable of elastically pressing the piston 3 to reset upward to allow the liquid in the sachet to flow into the metering chamber 212 is provided in the metering chamber 212.

[0008] The two-component packaging metering valve as described above, characterized in that: the valve rod 4 includes a main rod 43 and a sealing sleeve 44 sleeved on the lower end of the valve rod 4, and when the valve rod 4 slides downward, one end of the sealing sleeve 44 inserts into the inlet channel 23 to separate the inlet channel 23 from the metering chamber 212. The communication channel 41 and the discharge channel 42 are provided in the main rod 43, and a communication port 45 communicating with the communication channel 41 is provided at the lower end of the main rod 43. A communication cavity 441 communicating the inlet channel 23 with the communication port 45 is provided in the sealing sleeve 44. A one-way valve 6 capable of controlling the opening of the communication port 45 to allow liquid to fill into the sachet from the discharge channel 42 is provided in the communication cavity 441.

[0009] The two-component packaging metering valve as described above, characterized in that: a third elastic member 7 for elastically pressing the one-way valve 6 to reset and closing the communication port 45 is provided in the communication cavity 441.

[0010] The two-component packaging metering valve as described above, characterized in that: a first communication hole 431 communicating the metering chamber 212 with the communication channel 41, a second communication hole 432 communicating the communication channel 41 with the discharge chamber 22, and a third communication hole 433 extending into the discharge chamber 22 to communicate the discharge chamber 22 with the discharge channel 42 when the valve rod 4 slides downward are provided on the main rod 43.

[0011] The binary-packaging metering valve as described above is characterized in that: an upper limit positioning portion 24 for the upper part of the piston 3 to abut and be positioned after the piston 3 moves upward and a lower limit positioning portion 25 for the lower part of the piston 3 to abut and be positioned after the piston 3 moves downward are provided inside the valve body 2.

[0012] The binary-packaging metering valve as described above is characterized in that: the valve body 2 includes a lower valve body 26 with one end connected to the sachet and an upper valve body 27 connected between the lower valve body 26 and the sealing cup 1. The upper limit positioning portion 24 is a boss protruding downward from the inner top wall of the upper valve body 27 and protruding toward the lower valve body 26. The lower limit positioning portion 25 is a convex ring provided on the lower valve body 26 and protruding toward the upper valve body 27. An outer sleeve 261 is provided on the lower valve body 26 outside the convex ring. A slot 262 is provided between the outer sleeve 261 and the convex ring. An insertion tube 271 inserted into the slot 262 is provided on the upper valve body 27 outside the boss.

[0013] The binary-packaging metering valve as described above is characterized in that: an annular groove 263 is provided on the inner wall of the outer sleeve 261, and an annular protrusion 272 engaged with the annular groove 263 is provided on the outer wall of the insertion tube 271.

[0014] The binary-packaging metering valve as described above is characterized in that: an air inlet hole 273 communicating the air inlet cavity 211 with the aerosol can is provided on the valve body 2.

[0015] The binary-packaging metering valve as described above is characterized in that: a first sealing ring 8 which can slide relative to and sleeve on the valve rod 4 and can seal between the air inlet cavity 211 and the discharge cavity 22 is provided inside the valve body 2.

[0016] The binary-packaging metering valve as described above is characterized in that: an installation cavity 28 is provided inside the valve body 2. The first sealing ring 8 is provided in the installation cavity 28. An inner valve body 20 is provided on the first sealing ring 8 in the installation cavity 28. The discharge cavity 22 is provided inside the inner valve body 20. A second sealing ring 9 which can axially press the inner valve body 20 and the first sealing ring 8 in the installation cavity 28 is installed between the valve body 2 and the sealing cup 1.

[0017] Compared with the prior art, the present utility model has the following advantages:

[0018] 1. The structure of the utility model is simple and novel. The main chamber is separated into an air inlet chamber connected to the aerosol can and a metering chamber capable of storing a certain amount of liquid by a piston. When the liquid needs to be ejected, press the valve stem. After the valve stem slides downward, the lower end of the valve stem closes the liquid inlet passage, and the metering chamber, the communication passage, and the discharge passage form a liquid discharge path. Since the pressure of the compressed gas in the aerosol can is greater than the atmospheric pressure outside, the compressed gas will enter the air inlet chamber from the aerosol can and push the piston downward to squeeze the liquid in the metering chamber into the discharge passage. In this way, relying on the internal compressed gas of the aerosol can as the kinetic energy, the liquid is automatically pushed without the need to press the valve stem forcefully, which is convenient to use.

[0019] 2. When filling materials is required, press down the valve stem, and liquid can be filled into the discharge passage. Then the liquid enters the discharge chamber from the discharge passage and then enters the communication passage. The liquid impacts the one-way valve, causing the one-way valve to move downward against the elastic force of the third elastic member. In this way, the communication port is opened, and the liquid enters the sac through the liquid inlet passage. When the filling is completed, the third elastic member elastically presses the one-way valve to reset and closes the communication port. The overall structure is simple, which is convenient for assembling materials into the aerosol can with a binary packaging metering valve.

[0020] 3. The utility model controls the stroke of the piston moving up and down by designing an upper limit positioning part and a lower limit positioning part, so as to control the amount of liquid ejected each time.

Description of the Drawings

[0021] Figure 1 is the three-dimensional view of the utility model;

[0022] Figure 2 is the structural schematic diagram of the closed state when the utility model is installed on the aerosol can;

[0023] Figure 3 is the structural schematic diagram of the spraying state when the utility model is installed on the aerosol can;

[0024] Figure 4 is the structural schematic diagram of the filling state when the utility model is installed on the aerosol can;

[0025] Figure 5 is the exploded view of the utility model.

Detailed Embodiment

[0026] The following further describes the utility model in conjunction with the drawings:

[0027] Such as Figures 1 to 5As shown in the figure, a binary packaging metering valve includes a sealing cup 1 that can be hermetically connected to an aerosol can filled with compressed gas. A valve body 2 is provided on the sealing cup 1. A main chamber 21 and a discharge chamber 22 are provided in the valve body 2. A piston 3 is slidably disposed in the main chamber 21. The piston 3 divides the main chamber 21 into an upper and a lower part, an intake chamber 211 communicating with the aerosol can and a metering chamber 212 capable of storing a certain amount of liquid. An inlet channel 23 communicating the metering chamber 212 with a sachet and allowing liquid to enter the metering chamber 212 is provided in the valve body 2. A valve rod 4 is slidably disposed in the valve body 2. The upper end of the valve rod 4 passes through the sealing cup 1 and the lower end slidably passes through the piston 3. A communication channel 41 communicating the metering chamber 212 with the discharge chamber 22 and a discharge channel 42 that can communicate the discharge chamber 22 for liquid to flow out after the valve rod 4 slides downward are provided in the valve rod 4. When the valve rod 4 slides downward so that the lower end of the valve rod 4 closes the inlet channel 23 and allows the discharge channel 42 to communicate with the discharge chamber 22, the metering chamber 212 communicates with the external air through the communication channel 41, so that the compressed gas enters the intake chamber 211 from the aerosol can and pushes the piston 3 downward to squeeze the liquid in the metering chamber 212 into the discharge channel 42. A first elastic member 5 capable of elastically pressing the valve rod 4 to reset upward to close the discharge channel 42 from the discharge chamber 22 and at the same time open the inlet channel 23 is provided in the discharge chamber 22. A second elastic member 50 capable of elastically pressing the piston 3 to reset upward to allow the liquid in the sachet to flow into the metering chamber 212 is provided in the metering chamber 212. Specifically, an intake hole 273 communicating the intake chamber 211 with the aerosol can is provided on the valve body 2. The first elastic member 5 and the second elastic member 50 are springs, and the elastic force of the second elastic member 50 is much smaller than the pressure of the compressed gas on the piston 3, but the elastic force of the second elastic member 50 is sufficient to push the piston 3 upward when the gas pressure and liquid pressure on both sides of the piston 3 are balanced.

[0028] The structure of the utility model is simple and novel. The piston 3 divides the main chamber 21 into an air inlet chamber 211 communicating with the aerosol can and a metering chamber 212 capable of storing a certain amount of liquid up and down. When the liquid needs to be ejected, the valve rod 4 is pressed down. After the valve rod 4 slides downward, the lower end of the valve rod 4 closes the liquid inlet channel 23, while the metering chamber 212, the communication channel 41 and the discharge channel 42 form a liquid discharge path and communicate with the external atmosphere. Since the pressure of the compressed gas in the aerosol can is greater than the external atmospheric pressure, the compressed gas in the aerosol can will enter the air inlet chamber 211 through the air inlet hole 273 and push the piston 3 to move downward against the elastic force of the second elastic member 50, thereby squeezing the liquid in the metering chamber 212 into the discharge channel 42. In this way, relying on the compressed gas inside the aerosol can as kinetic energy, the liquid is automatically pushed, without the need to press the valve rod laboriously, and it is convenient to use. When the first elastic member 5 elastically presses the valve rod 4 to reset upward, the discharge channel 42 is closed with the discharge chamber 22, and at the same time, the lower end of the valve rod 4 moves away from the liquid inlet channel 23 to open the liquid inlet channel 23. At this time, the pressure of the compressed gas on the liquid in the sachet is the same as the pressure of the compressed gas on the piston 3 from the air inlet chamber 211. The second elastic member 50 in the metering chamber 212 will push the piston 3 to move upward from the lower side of the piston 3, so that a negative pressure is formed in the metering chamber 212, and the liquid in the sachet flows into the metering chamber 212.

[0029] Since the liquid in the dual-component packaging needs to enter the sachet through the internal channel of the valve chamber, considering that the valve rod is in a sealed state with the valve chamber during filling of the metering valve and the liquid cannot enter the sachet through the tail hole of the valve chamber, the utility model also makes the following design. The valve rod 4 includes a main rod 43 and a sealing sleeve 44 sleeved on the lower end of the valve rod 4. When the valve rod 4 slides downward, one end of the sealing sleeve 44 inserts into the liquid inlet channel 23 to separate the liquid inlet channel 23 from the metering chamber 212. The communication channel 41 and the discharge channel 42 are arranged in the main rod 43, and a communication port 45 communicating with the communication channel 41 is arranged at the lower end of the main rod 43. A communication cavity 441 communicating the liquid inlet channel 23 with the communication port 45 is arranged in the sealing sleeve 44, and a one-way valve 6 capable of controlling the opening of the communication port 45 to fill the liquid from the discharge channel 42 into the sachet is arranged in the communication cavity 441. A third elastic member 7 that elastically presses the one-way valve 6 to reset and closes the communication port 45 is arranged in the communication cavity 441. Specifically, the third elastic member 7 is a spring.

[0030] The above structure can overcome the difficulty of filling materials for the dual-component packaging metering valve, such as Figure 4As shown in the figure, when filling materials, the valve stem 4 is pressed down, and liquid can be filled into the discharge channel 42. Then the liquid enters the discharge cavity 22 from the discharge channel 42 and then enters the communication channel 41. The liquid impacts the one-way valve 6, causing the one-way valve 6 to move downward against the elastic force of the third elastic member 7. In this way, the communication port 45 is opened, and the liquid enters the sachet 30 through the liquid inlet channel 23. After filling, the third elastic member 7 presses the one-way valve 6 to reset and closes the communication port 45. The overall structure is simple, facilitating the filling of materials into the aerosol can equipped with the binary packaging metering valve.

[0031] Specifically, the main rod 43 is provided with a first communication hole 431 connecting the metering cavity 212 and the communication channel 41, a second communication hole 432 connecting the communication channel 41 and the discharge cavity 22, and a third communication hole 433 that extends into the discharge cavity 22 when the valve stem 4 slides downward to connect the discharge cavity 22 and the discharge channel 42.

[0032] In the present utility model, the valve body 2 is provided with an upper limit positioning portion 24 for the upper part of the piston 3 to abut and be positioned after the piston 3 moves upward, and a lower limit positioning portion 25 for the lower part of the piston 3 to abut and be positioned after the piston 3 moves downward. By designing the upper limit positioning portion 24 and the lower limit positioning portion 25, the stroke of the piston 3 moving up and down can be controlled, thereby controlling the amount of liquid ejected each time.

[0033] Specifically, the valve body 2 includes a lower valve body 26 connected to the sachet at one end and an upper valve body 27 connected between the lower valve body 26 and the sealing cup 1. The upper limit positioning portion 24 is a convex platform provided on the inner top wall of the upper valve body 27 and protruding downward toward the lower valve body 26. The lower limit positioning portion 25 is a convex ring provided on the lower valve body 26 and protruding upward toward the upper valve body 27. An outer sleeve 261 is provided on the lower valve body 26 outside the convex ring, and a slot 262 is provided between the outer sleeve 261 and the convex ring. An insertion tube 271 inserted into the slot 262 is provided on the upper valve body 27 outside the convex platform. In the present utility model, the valve body 2 is divided into an upper valve body 27 and a lower valve body 26. The upper valve body 27 is inserted into the lower valve body 26 through the insertion tube 271 inserted into the slot 262, which is convenient and fast for installation.

[0034] Furthermore, an annular groove 263 is provided on the inner wall of the outer sleeve 261, and an annular protrusion 272 that is snapped into the annular groove 263 is provided on the outer wall of the insertion tube 271. The cooperation of the annular protrusion 272 and the annular groove 263 can make the connection between the upper valve body 27 and the lower valve body 26 more firm.

[0035] A first sealing ring 8 that can slide relative to the valve stem 4 and seal between the air inlet cavity 211 and the discharge cavity 22 is provided in the valve body 2, which can ensure the sealing performance of the gap between the air inlet cavity 211 and the discharge cavity 22.

[0036] Specifically, an installation cavity 28 is provided inside the valve body 2. The first sealing ring 8 is arranged inside the installation cavity 28. An inner valve body 20 is provided on the first sealing ring 8 inside the installation cavity 28. The discharge cavity 22 is arranged inside the inner valve body 20. A second sealing ring 9 is installed between the valve body 2 and the cup seal 1, which can axially press the inner valve body 20 and the first sealing ring 8 inside the installation cavity 28. In the initial state, the third communication hole 433 is located above the second sealing ring 9. After the valve stem slides downward, the third communication hole 433 moves below the second sealing ring 9 and communicates with the discharge cavity 22. When the first elastic member 5 elastically presses the valve stem 4 to reset upward, the third communication hole 433 moves back above the second sealing ring 9, and thus the binary packaging metering valve is sealed again.

[0037] When this binary packaging metering valve is assembled to the aerosol can 40, the cup seal 1 is buckled on the flange at the mouth of the aerosol can through the connecting flange to fix the metering valve on the aerosol can 40. Specifically, a cup seal washer 50 is provided inside the cup seal 1. When the cup seal 1 is installed on the aerosol can, the cup seal 1 presses the cup seal washer 50 against the end of the mouth of the aerosol can 40 to achieve the fixed seal between the cup seal 1 and the aerosol can 40. A suction pipe 10 communicating with the liquid inlet channel 23 is provided at the lower end of the valve body 2, and the suction pipe 10 extends into the sachet 30.

[0038] The working principle of this binary packaging metering valve after being assembled to the aerosol can 40: First, press the valve stem 4 to make the valve stem 4 slide downward, and then the sealing sleeve 44 will isolate the liquid inlet channel 23 from the metering cavity 212. Since the compressed gas pressure inside the aerosol can 40 is greater than the external atmospheric pressure, the compressed gas inside the aerosol can will enter the intake cavity 211 through the intake hole 273 and push the piston 3 to move downward against the elastic force of the second elastic member 50, squeezing the liquid in the metering cavity 212. The liquid is sent into the communication channel 41 through the first communication hole 431, then enters the discharge cavity 22 through the second communication hole 432, and finally enters the discharge channel 42 through the first communication hole 431 and is ejected. After releasing the valve stem 4, the first elastic member 5 elastically presses the valve stem 4 to reset upward, and the second elastic member 50 will push the piston 3 to move upward from the lower side of the piston 3, creating a negative pressure in the metering cavity 212. The compressed gas inside the aerosol can 40 will squeeze the sachet 30, causing the liquid in the sachet 30 to fill the metering cavity 212 through the liquid inlet channel 23, and filling the communication channel 41 and the discharge cavity 22, waiting for the next metered ejection.

Claims

1. A two-component packaging quantitative valve, characterized in that: The invention comprises a sealing cup (1) which can be sealed and connected to an aerosol can filled with compressed gas, the sealing cup (1) being provided with a valve body (2), the valve body (2) being provided with a main chamber (21) and a discharge chamber (22), the main chamber (21) being provided with a piston (3) which can slide relatively, the piston (3) separating the main chamber (21) into an air inlet chamber (211) which is connected to the aerosol can and a quantitative chamber (212) which can store a certain amount of liquid, the valve body (2) being provided with a liquid inlet channel (23) which connects the quantitative chamber (212) and a bag and can supply liquid into the quantitative chamber (212), the valve body (2) being provided with a valve stem (4) which can slide relatively, the upper end of which passes through the sealing cup (1) and the lower end of which can slide through the piston (3), the valve stem (4) being provided with a connecting channel (41) which connects the quantitative chamber (212) and the discharge chamber (22) and a discharge channel (42) which can be connected to the discharge chamber (22) for liquid to flow out when the valve stem (4) slides downward; when the valve stem (4) slides downward so that the lower end of the valve stem (4) closes the liquid inlet channel (23) and allows the discharge channel (42) to be connected to the discharge chamber (22), the quantitative chamber (212) is connected to the external air through the connecting channel (41), so that compressed gas enters the air inlet chamber (211) from the aerosol can and pushes the piston (3) downward to squeeze the liquid in the quantitative chamber (212) into the discharge channel (42); the discharge chamber (22) is provided with a first elastic member (5) which can press the valve stem (4) to reset upward so that the discharge channel (42) and the discharge chamber (22) are closed and the liquid inlet channel (23) is opened at the same time; and the quantitative chamber (212) is provided with a second elastic member (50) which can press the piston (3) to reset upward so that the liquid in the bag flows into the quantitative chamber (212).

2. The two-component packaging quantitative valve according to claim 1, characterized in that: The valve stem (4) comprises a main stem (43) and a sealing sleeve (44) which is sleeved on the lower end of the valve stem (4) and has one end inserted into the liquid inlet channel (23) when the valve stem (4) slides downward so as to separate the liquid inlet channel (23) from the quantitative chamber (212); the connecting channel (41) and the discharge channel (42) are arranged in the main stem (43) and the lower end of the main stem (43) is provided with a connecting port (45) connected to the connecting channel (41); a connecting cavity (441) connecting the liquid inlet channel (23) and the connecting port (45) is provided in the sealing sleeve (44); a one-way valve (6) in the connecting cavity (441) can control the opening of the connecting port (45) so as to allow liquid to be filled into the bag from the discharge channel (42).

3. The dual packaging quantitative valve according to claim 2, characterized in that: The communication cavity (441) is provided with a third elastic member (7) for resetting the one-way valve (6) to close the communication port (45).

4. The dual packaging quantitative valve according to claim 2, characterized in that: The main rod (43) is provided with a first connecting hole (431) connecting the quantitative chamber (212) and the connecting channel (41), a second connecting hole (432) connecting the connecting channel (41) and the discharge chamber (22), and a third connecting hole (433) which extends into the discharge chamber (22) and connects the discharge chamber (22) with the discharge channel (42) when the valve rod (4) slides downward.

5. The dual packaging quantitative valve according to claim 1, characterized in that: The valve body (2) is provided with an upper limit positioning portion (24) for the upper part of the piston (3) to abut and position when the piston (3) moves upward, and a lower limit positioning portion (25) for the lower part of the piston (3) to abut and position when the piston (3) moves downward.

6. The dual packaging quantitative valve according to claim 5, characterized in that: The valve body (2) comprises a lower valve body (26) having one end connected to the bladder and an upper valve body (27) connected between the lower valve body (26) and the sealing cup (1); the upper limit positioning portion (24) is a boss provided on the inner top wall of the upper valve body (27) and protruding toward the lower valve body (26); the lower limit positioning portion (25) is a convex ring provided on the lower valve body (26) and protruding toward the upper valve body (27); an outer sleeve (261) is provided on the outer side of the convex ring on the lower valve body (26); a slot (262) is provided between the outer sleeve (261) and the convex ring; and a tube (271) is provided on the outer side of the boss on the upper valve body (27) and inserted into the slot (262).

7. The dual packaging quantitative valve according to claim 6, characterized in that: An annular groove (263) is provided on the inner wall of the outer sleeve (261), and an annular protrusion (272) which is inserted into the annular groove (263) is provided on the outer wall of the insertion tube (271).

8. The dual packaging quantitative valve according to claim 1, characterized in that: The valve body (2) is provided with an air inlet hole (273) communicating with the air inlet cavity (211) and the aerosol can.

9. The dual packaging quantitative valve according to claim 1, characterized in that: The valve body (2) is provided with a first sealing ring (8) which can be relatively slidably sleeved on the valve stem (4) and can seal between the air inlet cavity (211) and the material discharge cavity (22).

10. The dual packaging quantitative valve according to claim 9, characterized in that: The valve body (2) is provided with a mounting cavity (28), the first sealing ring (8) is provided in the mounting cavity (28), an inner valve body (20) is provided on the first sealing ring (8) in the mounting cavity (28), the discharge cavity (22) is provided in the inner valve body (20), and a second sealing ring (9) is installed between the valve body (2) and the sealing cup (1) so as to axially press the inner valve body (20) and the first sealing ring (8) in the mounting cavity (28).

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