Valve and anesthesia apparatus

Abstract

This application discloses a valve and anesthesia device. The valve includes: a valve base with a valve core axially movable on it; a mounting base with a communicating air inlet and outlet, the sealing end of the valve core sealingly abutting the air inlet to open or close it; one side of the mounting base abutting against the valve base; a fastening nut fitted onto the outer periphery of the mounting base and threaded thereto, one axial end of the fastening nut having an inwardly extending limiting ring, the outer edge of the valve base being clamped between the limiting ring and the mounting base; and a breathing circuit module detachably located on the other side of the mounting base, one end of the mounting base having an air inlet and an outlet extending into the breathing circuit module, the breathing circuit module having an air inlet channel communicating with the air inlet and an air outlet communicating with the outlet. This valve can be easily separated from the breathing circuit, avoiding the need for the breathing circuit and valve body to be disinfected together, thus extending the service life of the valve core.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a valve and anesthesia device. Background Technology

[0002] The APL valve (Adjustable Pressure Limiting Valve) is a core pressure limiting component in the breathing circuit (or absorption circuit) of a medical anesthesia machine. It is mainly used to precisely control airway pressure, prevent damage to the patient's airway due to excessive pressure, and at the same time achieve orderly gas discharge and maintain gas pressure balance within the circuit.

[0003] Currently, the valve core and valve body of APL valves are mostly installed separately. When cleaning and disinfecting the breathing circuit, since the valve core is built into the breathing circuit and cannot be separated, the operator can only disinfect the entire breathing circuit and valve body together. The valve core is usually made of elastic material, which is prone to deformation and aging when exposed to high temperature, high pressure or strong disinfectant environment for a long time. This leads to a decrease in the sealing performance of the valve core, which ultimately causes inaccurate pressure control values ​​of APL valves and may even cause safety hazards.

[0004] Therefore, how to disinfect the valve body separately is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a valve and anesthesia device that allows the entire valve to be easily separated from the breathing circuit without disassembling the internal structure, thus avoiding the need for the breathing circuit and valve body to be disinfected together and extending the service life of the valve core.

[0006] To achieve the above objectives, this application provides a valve, comprising:

[0007] A valve base, wherein a valve core is provided on the valve base and is axially movable;

[0008] The mounting base is provided with a connected air inlet and an air outlet. The sealing end of the valve core is sealed against the air inlet to open or close the air inlet. One side of the mounting base abuts against the valve base.

[0009] A fastening nut is fitted onto the outer periphery of the mounting base and threaded thereto. One axial end of the fastening nut is provided with an inwardly extending limiting ring. The outer edge of the valve base is clamped between the limiting ring and the mounting base.

[0010] A breathing circuit module is detachably disposed on the other side of the mounting base. One end of the mounting base having the air inlet and the air outlet extends into the breathing circuit module. The breathing circuit module is provided with an air intake channel communicating with the air inlet and an exhaust channel communicating with the air outlet.

[0011] Optionally, the breathing circuit module includes a circuit panel and a circuit base plate. The circuit panel is fixedly connected to the mounting base, and the circuit base plate is fixedly disposed on the side of the circuit panel away from the mounting base. The circuit base plate is provided with the air intake channel and cooperates with the circuit panel to form the exhaust channel.

[0012] Optionally, it also includes an activity adjustment component;

[0013] The valve base includes an upwardly extending first cylindrical portion; the movable adjustment assembly includes a spiral column, a knob housing, and a limiting post. The spiral column is disposed inside the first cylindrical portion and threadedly engaged with it. The knob housing is sleeved on the outer periphery of the first cylindrical portion and fixedly connected to the spiral column. The limiting post is fixedly disposed inside the spiral column.

[0014] The valve core is provided with a valve stem, one end of which extends into the spiral column away from the valve core, and a blocking member that can slide along the axial direction of the spiral column is provided at the end of the valve stem. A first spring is provided between the blocking member and the limiting column, and the first spring is used to provide an elastic force to the valve core to press the air inlet.

[0015] Optionally, a hollow cavity is formed in the mounting base, and both the air inlet and the air outlet are connected to the hollow cavity, with the valve core movably disposed within the hollow cavity.

[0016] Optionally, the first cylindrical portion extends downward and seals with the hollow cavity. The hollow cavity has a stepped structure located between the first cylindrical portion and the air inlet. A guide plate is fixedly provided on the stepped structure, and the valve stem passes through the guide plate and is guided and engaged with it.

[0017] Optionally, it also includes a position indication component, which includes a steel ball, a limiting block, a retaining ring, and a second spring;

[0018] The limiting block is sleeved on the outer periphery of the spiral column and fixedly disposed on the top of the first cylindrical part. The circumferential sidewall of the limiting block is provided with a plurality of positioning holes, each of which is radially through and has a retaining ring at one end and faces the spiral column at the other end.

[0019] The steel ball is located at one end of the positioning hole near the spiral column, and the second spring is located between the retaining ring and the steel ball to provide the steel ball with an elastic force to move toward the spiral column; the outer circumferential surface of the spiral column is provided with a plurality of arc-shaped grooves corresponding to the steel ball. When the steel ball is embedded in the arc-shaped groove, it collides with the outer wall of the spiral column to produce a prompt sound.

[0020] Optionally, at a first position in the axial direction, the limiting block interferes with the inner wall of the knob housing to restrict the downward movement of the movable adjustment component; the inner ring of the limiting block radially protrudes beyond the inner ring of the first cylindrical portion; at a second position in the axial direction, the external thread of the helical column interferes with the inner ring of the limiting block to restrict the upward movement of the movable adjustment component.

[0021] Optionally, it also includes a cover plate, which is fixed to the top of the knob housing by a snap-fit ​​structure to cover the top opening of the knob housing.

[0022] Optionally, the valve base includes an upwardly extending second cylindrical portion, and the lower edge of the knob housing is embedded in the annular gap between the first cylindrical portion and the second cylindrical portion; the outer periphery of the second cylindrical portion is wrapped with a plastic shell, and the plastic shell is adapted to the material and color of the knob housing and the fastening nut.

[0023] An anesthesia device comprising the valve described in any of the preceding claims.

[0024] The beneficial effects of this application lie in the integrated design of the valve core and valve base as a single unit, and the detachable connection between the mounting base and the breathing circuit module. One side of the mounting base abuts against the valve base, while the other side inserts into the breathing circuit module, forming an air passage. The fastening nut is threaded onto the outer circumference of the mounting base, and its inner limiting ring engages with the outer edge of the mounting base to achieve axial locking of the entire valve body structure. When cleaning or disinfection is required, the operator only needs to loosen and remove the fastening nut to quickly separate the valve assembly, including the valve core, valve base, and mounting base, from the breathing circuit module without disassembling internal valve components or performing overall treatment of the breathing circuit module. The operator can then perform targeted disinfection on the removed valve assembly. This valve not only avoids the aging and deformation problems caused by the non-removable valve core being exposed to high temperature, high pressure, or highly corrosive disinfection environments for a long time, as in traditional designs, but also significantly simplifies the maintenance process and improves the maintenance efficiency and safety reliability of the equipment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is an exploded view of the valve provided in an embodiment of this application;

[0027] Figure 2This is a front view of the valve provided in an embodiment of this application;

[0028] Figure 3 for Figure 2 Sectional view along line AA;

[0029] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0030] Figure 5 This is a partial structural assembly drawing of the valve provided in an embodiment of this application.

[0031] In the diagram: 1-Cover plate; 2-Knob housing; 3-Limiting block; 4-Limiting post; 5-Positioning hole; 6-Arc groove; 7-Spiral post; 8-Valve base; 9-First cylindrical part; 10-Second cylindrical part; 11-Plastic shell; 12-First spring; 13-Fastening nut; 14-Blocking component; 15-Valve stem; 16-Guide plate; 17-Valve core; 18-Mounting base; 19-Hollow cavity; 20-Air outlet; 21-Breathing circuit module; 22-Circuit panel; 23-Circuit base plate; 24-Step structure; 25-Air inlet; 26-Exhaust channel; 27-Air inlet channel; 28-Steel ball; 29-Second spring; 30-Retaining ring. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does 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. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 and Figure 2As shown, in this embodiment, a valve is provided, which mainly includes a valve base 8, a mounting base 18, a fastening nut 13, and a breathing circuit module 21. The valve base 8 is the support and mounting foundation of the entire valve. A valve core 17 is movably disposed on the valve base 8 along its axial direction. The valve core 17 can move axially under the drive of external force or internal elastic force, thereby realizing the opening and closing of the airflow channel. The valve core 17 is usually made of a material with good elasticity and sealing performance (such as medical silicone), and one end of it is a sealing end, used to directly contact and seal the airflow inlet.

[0036] Mounting bracket 18 connects valve base 8 and breathing circuit module 21. Mounting bracket 18 has an inlet 25 and an outlet 20 that communicate with each other, forming a gas flow channel. Under normal operating conditions, the sealing end of valve core 17 tightly abuts against inlet 25, forming a reliable seal and closing inlet 25. When the pressure at inlet 25 reaches a preset value and exhaust is required, valve core 17 moves upward against spring force under the pressure at inlet 25, opening inlet 25. Gas flows in from inlet 25 and is discharged through outlet 20, achieving the pressure relief function. One side (usually the upper side) of mounting bracket 18 tightly abuts against the lower end face of valve base 8, ensuring a stable and airtight connection between the two.

[0037] The fastening nut 13 is fitted onto the outer periphery of the mounting base 18 and threadedly connected to the outer wall of the mounting base 18. One axial end of the fastening nut 13 has a radially inwardly extending limiting ring. When the fastening nut 13 is tightened, the limiting ring presses downward against the outer edge boss of the valve base 8, while the other side of the valve base 8 is pushed upward by the mounting base 18. This securely clamps the outer edge of the valve base 8 between the limiting ring and the mounting base 18, forming a stable axial preload, effectively preventing the valve base 8 and its movable adjustment components from loosening during use.

[0038] The breathing circuit module 21 is detachably mounted on the other side of the mounting base 18. Specifically, the detachability can be achieved through screw connections, snap-fit ​​connections, etc. Furthermore, one end of the mounting base 18, which has an air inlet 25 and an air outlet 20, extends downward into the interior of the breathing circuit module 21. Inside the breathing circuit module 21, there is an air inlet channel 27 that is sealed and connected to the air inlet 25 of the mounting base 18, and an exhaust channel 26 that is sealed and connected to the air outlet 20, thereby realizing a complete gas passage from the breathing circuit to the valve and then to the outside world.

[0039] When the breathing circuit needs to be cleaned and disinfected, the operator only needs to loosen and remove the fastening nut 13 with a tool, and the clamping force of the limit ring on the valve base 8 will disappear. At this time, the entire valve assembly, including the valve base 8, valve core 17 and mounting seat 18, can be easily removed from the breathing circuit module 21 as a whole, achieving complete separation. This allows the valve to avoid being disinfected together with the breathing circuit module 21, thereby greatly extending its service life and ensuring the accuracy of pressure control.

[0040] Based on the above embodiments, please refer to Figure 3 The breathing circuit module 21 includes a circuit panel 22 and a circuit base plate 23. The circuit panel 22 is the main frame of the breathing circuit module 21, and its side facing the valve is used to fix the mounting base 18. The end of the mounting base 18 that extends into the breathing circuit module 21 is fixedly connected to the circuit panel 22 by means of snaps, screws or interference fits to ensure that no relative displacement occurs during use and to ensure the stability of the air circuit.

[0041] The circuit base plate 23 is fixedly mounted on the side of the circuit panel 22 facing away from the mounting base 18. Together with the circuit panel 22, it forms the exhaust channel 26 of the breathing circuit. Specifically, the air intake channel 27 is directly formed on the circuit base plate 23, and is a channel that penetrates the thickness of the base plate. Its upper opening connects with the air intake port 25 of the mounting base 18, while the exhaust channel 26 is formed by the interaction of the circuit panel 22 and the circuit base plate 23. For example, a groove is machined on the lower surface of the circuit panel 22. When the circuit base plate 23 is closed, the groove is sealed, thus forming a complete exhaust channel 26. One end of the exhaust channel 26 is connected to the air outlet 20 of the mounting base 18.

[0042] The valve also includes a movable adjustment component; please refer to [link / reference]. Figure 1 and Figure 3 The valve base 8 has an upwardly extending first cylindrical part 9, which serves as the mounting frame for the adjustment assembly. The movable adjustment assembly mainly includes a spiral column 7, a knob housing 2, and a limiting column 4. The spiral column 7 is a hollow or grooved cylindrical member with external threads. The spiral column 7 is installed inside the first cylindrical part 9 and engages with the threaded inner wall of the first cylindrical part 9.

[0043] The knob housing 2 is fitted around the outer periphery of the first cylindrical portion 9 and is fixedly connected to the internal spiral post 7 by means of keyways, pins, or integral molding. Therefore, when the outer knob housing 2 is rotated, the internal spiral post 7 will simultaneously move in a spiral up-and-down motion within the first cylindrical portion 9.

[0044] The valve core 17 is equipped with a valve stem 15, please refer to... Figure 1 and Figure 3One end of the valve stem 15 is connected to the valve core 17, and the other end extends upward, passing through the first cylindrical portion 9 and extending into the internal cavity of the spiral column 7. At the end of the valve stem 15 that extends into the spiral column 7, a stop 14 is fixedly installed. The stop 14 can be a pin or a disc, and the stop 14 can slide freely along the axial direction of the spiral column 7 within the range defined by the inner wall of the spiral column 7.

[0045] The limiting post 4 is a rigid cylindrical structure fixed at the center of the spiral post 7. A first spring 12 is provided between the blocking member 14 and the limiting post 4. The upper end of the first spring 12 abuts against the lower end surface of the limiting post 4, and the lower end abuts against the upper end surface of the blocking member 14. The first spring 12 is always in a compressed state, continuously applying a downward elastic force to the valve core 17, forcing the sealing end of the valve core 17 to press tightly against the air inlet 25 of the mounting base 18. Of course, when the pressure in the air inlet channel 27 in the breathing circuit module 21 increases and acts below the valve core 17, if the pressure exceeds the preset pressure, the pressure can overcome the elastic force of the first spring 12, which will push the valve core 17 and the valve stem 15 upward, thereby causing the sealing end of the valve core 17 to disengage from the air inlet 25 and open the exhaust channel 26.

[0046] By rotating the knob housing 2 to adjust the height of the spiral column 7, the initial compression of the first spring 12 can be changed, thereby changing the pressure value required to open the valve and realizing the adjustment of different preset pressures.

[0047] Please refer to Figure 3 The mounting base 18 has a hollow cavity 19 inside, and the air inlet 25 and the air outlet 20 are both connected to the hollow cavity 19. The valve core 17 is movably disposed in the hollow cavity 19. In some embodiments, the air inlet 25 is located at the lowermost side of the mounting base 18, and the air outlets 20 are distributed around the air inlet 25. There can be multiple air outlets 20.

[0048] The first cylindrical portion 9 of the valve base 8 extends not only upwards but also downwards, and is inserted into the hollow cavity 19 of the mounting base 18. The lower outer wall of the first cylindrical portion 9 is sealed with a sealing ring (such as an O-ring) to ensure that high-pressure gas does not leak from this point.

[0049] Inside the hollow cavity 19, a stepped structure 24 is provided between the lower end of the first cylindrical portion 9 and the air inlet 25. Please refer to [reference needed]. Figure 3The stepped structure 24 protrudes towards the interior of the hollow cavity 19, forming a stable platform. A guide plate 16 is fixedly installed on this platform, and can be easily disassembled by screws. A guide hole matching the diameter of the valve stem 15 is located at the center of the guide plate 16. When the valve stem 15 on the valve core 17 moves up and down, it passes through this guide hole, thus constraining the movement trajectory of the valve stem 15 and ensuring that it can move linearly along the axial direction without deviation or wobbling. This guiding structure improves the repeatability and sealing reliability of the valve core 17's movement, avoiding sealing failure or accelerated wear caused by valve core 17 misalignment.

[0050] In addition, the valve also includes a position indicator component, please refer to... Figure 3 and Figure 4 The position indication component includes a steel ball 28, a limiting block 3, a retaining ring 30, and a second spring 29. The limiting block 3 has an overall annular structure and is fitted around the outer periphery of the spiral column 7, and is fixed to the top of the first cylindrical part 9 by screws or other means. On the circumferential sidewall of the limiting block 3, a plurality of positioning holes 5 are evenly provided along the circumferential direction. The positioning holes 5 penetrate the limiting block 3 radially, with one end opening towards the spiral column 7 and the other end provided with a retaining ring 30.

[0051] In each positioning hole 5, starting from the end with the retaining ring 30, a second spring 29 and a steel ball 28 are sequentially installed; the second spring 29 is always in a compressed state, continuously pushing the steel ball 28 towards the other end of the positioning hole 5, that is, towards the spiral column 7.

[0052] Meanwhile, on the outer circumferential surface of the spiral column 7, corresponding to the preset pressure level, there are multiple arc-shaped grooves 6. The positions of the arc-shaped grooves 6 correspond to the positions of the steel balls 28, and the shapes of the arc-shaped grooves 6 match the spherical surfaces of the steel balls 28. Please refer to... Figure 5 When the operator rotates the knob housing 2, causing the spiral column 7 to rotate, the outer wall of the spiral column 7 will compress the steel ball 28, causing it to retract into the positioning hole 5. Once a certain arc-shaped groove 6 on the spiral column 7 rotates to a position aligned with the steel ball 28, the steel ball 28 will be pushed into the arc-shaped groove 6 with a "click" under the force of the second spring 29. This insertion action will produce a clear tactile sensation and sound, i.e., a prompt tone, clearly informing the operator that a standard pressure set point has been adjusted.

[0053] For example, when the pressure is adjusted to the corresponding 30cmH2O pressure value by rotating the knob housing 2 (i.e., the pressure setting reaches the threshold), the steel ball 28 is embedded in the arc-shaped groove 6 under the action of the second spring 29, emitting a clear "click" sound; this sound prompt provides clear blind operation feedback for the operator, and even in surgical scenarios with limited visibility, the operator can accurately determine the setting position of the pressure value corresponding to 30cmH2O through sound, avoid adjustment deviation, and improve operation safety.

[0054] Among them, the arc-shaped groove 6 refers to a groove whose cross-section is arc-shaped. The arc-shaped groove 6 as a whole can be a long strip structure, that is, the length direction of the arc-shaped groove 6 is in the same direction as the axis of the spiral column 7.

[0055] Furthermore, when the movable adjustment assembly (i.e., the knob housing 2 and the screw post 7) ​​moves downward to the bottom of its stroke (first position), the upper surface of the limiting block 3 interferes with the inner wall of the knob housing 2, forming a physical stop and preventing it from continuing to move downward. Conversely, when the movable adjustment assembly moves upward to the top of its stroke (second position), because the inner ring of the limiting block 3 protrudes radially beyond the inner ring of the first cylindrical portion 9, the threaded portion of the outer circumference of the screw post 7 interferes with the hole wall of the inner ring of the limiting block 3, similarly forming a reliable upper limit. These two limiting structures work together to ensure that the movable adjustment assembly operates within a safe and effective stroke range.

[0056] In some embodiments, the top of the knob housing 2 typically has an opening for assembly. To conceal this opening, maintain the integrity of the product's appearance, and prevent dust or liquid from entering the interior, a cover plate 1 is provided on the top of the knob housing 2. The cover plate 1 is securely fixed to the top of the knob housing 2 by a snap-fit ​​structure, which is both easy to assemble and provides a good sealing effect; the snap-fit ​​structure can be a combination of a flexible barb and a slot.

[0057] Please refer to Figure 3 In addition to the first cylindrical portion 9 extending upward for mounting the movable adjustment component, the valve base 8 also has a second cylindrical portion 10 extending upward concentrically on its outer side. The lower edge of the knob housing 2 is embedded in the annular gap between the first cylindrical portion 9 and the second cylindrical portion 10, forming a wraparound structure that makes the appearance neater and more attractive.

[0058] In addition, the outer periphery of the second cylindrical part 10 is wrapped with a plastic shell 11, which not only serves a decorative purpose but also provides a better grip. The plastic shell 11 can be made of the same material and color as the knob housing 2, fastening nut 13 and other components to keep the overall appearance of the valve consistent and enhance the valve's aesthetics and professionalism.

[0059] This application also provides an anesthesia device, which includes the above-mentioned valve. The valve is integrated into the breathing circuit system of the anesthesia device, which not only effectively solves the technical problems of valve core 17 aging, sealing failure and pressure control inaccuracy caused by the non-separability of traditional APL valves during cleaning and disinfection, but also significantly improves the maintenance convenience and safety of the whole machine.

[0060] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0061] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A valve, characterized in that, include: A valve base (8) is provided with a valve core (17) that is axially movable. The mounting base (18) is provided with an air inlet (25) and an air outlet (20) that are connected. The sealing end of the valve core (17) is sealed against the air inlet (25) to open or close the air inlet (25). One side of the mounting base (18) is in contact with the valve base (8). A fastening nut (13) is fitted onto the outer periphery of the mounting base (18) and threadedly connected thereto. One axial end of the fastening nut (13) is provided with an inwardly extending limiting ring. The outer edge of the valve base (8) is clamped between the limiting ring and the mounting base (18). The breathing circuit module (21) is detachably disposed on the other side of the mounting base (18). The mounting base (18) has one end with the air inlet (25) and the air outlet (20) extending into the breathing circuit module (21). The breathing circuit module (21) is provided with an air intake channel (27) communicating with the air inlet (25) and an exhaust channel (26) communicating with the air outlet (20).

2. The valve according to claim 1, characterized in that, The breathing circuit module (21) includes a circuit panel (22) and a circuit base plate (23). The circuit panel (22) is fixedly connected to the mounting base (18), and the circuit base plate (23) is fixedly disposed on the side of the circuit panel (22) away from the mounting base (18). The circuit base plate (23) is provided with the air intake channel (27) and cooperates with the circuit panel (22) to form the exhaust channel (26).

3. The valve according to claim 1, characterized in that, It also includes activity adjustment components; The valve base (8) includes an upwardly extending first cylindrical portion (9); the movable adjustment assembly includes a spiral column (7), a knob housing (2), and a limiting column (4). The spiral column (7) is disposed inside the first cylindrical portion (9) and threadedly engaged with it. The knob housing (2) is sleeved on the outer periphery of the first cylindrical portion (9) and fixedly connected to the spiral column (7). The limiting column (4) is fixedly disposed inside the spiral column (7). The valve core (17) is provided with a valve stem (15), one end of the valve stem (15) away from the valve core (17) extends into the spiral column (7), and a blocking member (14) that can slide along the axial direction of the spiral column (7) is provided at its extended end; a first spring (12) is provided between the blocking member (14) and the limiting column (4), and the first spring (12) is used to provide an elastic force to the valve core (17) to press the air inlet (25).

4. The valve according to claim 3, characterized in that, A hollow cavity (19) is formed inside the mounting base (18). The air inlet (25) and the air outlet (20) are both connected to the hollow cavity (19). The valve core (17) is movably disposed inside the hollow cavity (19).

5. The valve according to claim 4, characterized in that, The first cylindrical part (9) extends downward and is sealed to the hollow cavity (19). The hollow cavity (19) has a stepped structure (24). The stepped structure (24) is located between the first cylindrical part (9) and the air inlet (25). A guide plate (16) is fixedly provided on the stepped structure (24). The valve stem (15) passes through the guide plate (16) and is guided to cooperate with it.

6. The valve according to claim 3, characterized in that, It also includes a position indication component, which includes a steel ball (28), a limiting block (3), a retaining ring (30) and a second spring (29). The limiting block (3) is sleeved on the outer periphery of the spiral column (7) and fixed on the top of the first cylindrical part (9). The circumferential sidewall of the limiting block (3) is provided with a plurality of positioning holes (5). Each positioning hole (5) is arranged radially through, with a retaining ring (30) at one end and the other end facing the spiral column (7). The steel ball (28) is located at one end of the positioning hole (5) near the spiral column (7). The second spring (29) is located between the retaining ring (30) and the steel ball (28) to provide the steel ball (28) with an elastic force to move toward the spiral column (7). The outer circumferential surface of the spiral column (7) is provided with a plurality of arc-shaped grooves (6) corresponding to the steel ball (28). When the steel ball (28) is embedded in the arc-shaped groove (6), it collides with the outer wall of the spiral column (7) to produce a prompt sound.

7. The valve according to claim 6, characterized in that, At the first position in the axial direction, the limiting block (3) interferes with the inner wall of the knob housing (2) to restrict the downward movement of the movable adjustment component; the inner ring of the limiting block (3) radially protrudes from the inner ring of the first cylindrical part (9); at the second position in the axial direction, the external thread of the spiral column (7) interferes with the inner ring of the limiting block (3) to restrict the upward movement of the movable adjustment component.

8. The valve according to claim 3, characterized in that, It also includes a cover plate (1), which is fixed to the top of the knob housing (2) by a snap-fit ​​structure to cover the top opening of the knob housing (2).

9. The valve according to claim 3, characterized in that, The valve base (8) includes an upwardly extending second cylindrical portion (10), and the lower edge of the knob housing (2) is embedded in the annular gap between the first cylindrical portion (9) and the second cylindrical portion (10); the second cylindrical portion (10) is wrapped with a plastic shell (11), and the plastic shell (11) is compatible with the material and color of the knob housing (2) and the fastening nut (13).

10. An anesthesia device, characterized in that, Includes the valve as described in any one of claims 1-9.

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