APL valve and respiratory anesthesia equipment with same

Abstract

The APL valve provided by the embodiment of the invention comprises a valve seat assembly, a valve rod assembly and a valve rod assembly, the pressure adjusting assembly is movably mounted in the valve body; the valve plate assembly comprises a bottom, a first sliding part and a third groove; one end of the first elastic piece abuts against the pressure adjusting assembly, and the other end of the first elastic piece abuts against the valve plate assembly; the first sliding part extends from part of the periphery of the bottom in the vertical direction, is clamped between the valve body and the pressure adjusting assembly, and is in sliding connection with the valve body and the pressure adjusting assembly; the third groove extends along the vertical direction from part of the periphery of the bottom; the bottom is used for controlling connection and disconnection between the air inlet and the air outlet. According to the APL valve, the valve plate assembly is in multi-layer sliding engagement with the valve body and the pressure adjusting assembly, so that the valve plate assembly operates stably when moving horizontally, and the APL valve is suitable for horizontal installation.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to an APL valve and a respiratory anesthesia device having the same. Background Technology

[0002] In the medical field, whether for human or veterinary medical use, APL valves (Adjustable Pressure Limiting valves) are often used to control the gas pressure in gas branches.

[0003] Existing APL valves are typically vertically installed. An APL valve has an inlet and an outlet. The valve plate assembly, due to its own weight and the elastic force of the elastic element (both located vertically), covers the inlet, cutting off the gas connection between the inlet and outlet. When the gas pressure at the inlet reaches or exceeds the sum of the valve plate assembly's weight and the elastic force of the element, the gas pushes the valve plate assembly upward, removing it from the inlet and opening the connection between the inlet and outlet, allowing the gas to escape. Adjusting the elastic force of the element changes the APL valve's opening pressure, thus altering the gas pressure in the connected gas branch.

[0004] When controlling the gas pressure in a gas branch, it is necessary to simultaneously operate and observe components such as the APL valve, flow meter, and pressure gauge to check the accuracy of the pressure control. For ease of operation and observation by medical personnel, these components should be placed together as much as possible, within the same line of sight. Float flow meters typically need to be installed vertically for observation by medical personnel at a horizontal line of sight. If the APL valve is placed near the float flow meter and can be observed at a horizontal line of sight, it needs to be installed horizontally. Existing APL valves often have valve plate assemblies consisting of plate-like components. The gas at the inlet pushes these plate-like components horizontally. Under the combined effects of vertical gravity, horizontal air pressure, and the elastic force of the elastic element, the plate-like components are difficult to maintain constant translation. Similarly, the elastic element, when placed horizontally, is also difficult to maintain its coaxiality during horizontal compression, leading to inaccurate pressure control. Summary of the Invention

[0005] This invention provides an APL valve designed to address the problem that existing APL valves are unsuitable for horizontal installation.

[0006] Firstly, an APL valve is provided, comprising: The valve seat assembly (1) includes an air inlet (11), an air outlet (12), and a valve body (13). The pressure regulating component (2) is movably installed inside the valve body (13); The valve plate assembly (3) includes a bottom (31), a first sliding portion (32) and a third groove (36); The first elastic element (4) has one end abutting against the pressure regulating component (2) and the other end abutting against the valve plate component (3). The first sliding part (32) extends from the outer periphery of the bottom (31) along its vertical direction and is sandwiched between the valve body (13) and the pressure regulating component (2), and is slidably connected to the valve body (13) and the pressure regulating component (2) respectively; the third groove (36) extends from the outer periphery of the bottom (31) along the vertical direction; the bottom (31) is used to control the opening and closing between the air inlet (11) and the air outlet (12).

[0007] In a second aspect, a respiratory anesthesia device is provided, including an inspiratory branch, an expiratory branch, a manually driven gas branch, a fresh gas branch, and a patient end branch. The fresh gas branch is used to draw fresh gas into the inspiratory branch, and the manually driven gas branch is used to provide driving gas. The driving gas is mixed with fresh gas and then reaches the patient end branch. A flow meter and pressure gauge are installed in the fresh gas branch, and an APL valve as described above is installed in the manually driven gas branch for gas pressure control.

[0008] In the APL valve of this invention, one end of the first elastic element abuts against the pressure regulating component inside the valve body, and the other end abuts against the valve plate assembly. A first sliding portion extending from the bottom outer periphery of the valve plate assembly is sandwiched between the valve body and the pressure regulating component, and is slidably connected to both the valve body and the pressure regulating component. Under the action of the first elastic element, the bottom of the valve plate assembly covers the air inlet, cutting off the gas communication between the air inlet and the air outlet. When the air pressure at the air inlet reaches or exceeds the elastic force of the first elastic element, the gas pushes the valve plate assembly to move horizontally, so that it no longer covers the air inlet. The gas passes through the third groove extending from the bottom outer periphery of the valve plate assembly to the air outlet, and the air inlet and the air outlet are connected. When the air pressure at the air inlet is less than the elastic force of the first elastic element, the first elastic element pushes the valve plate assembly to move horizontally in the opposite direction. The multi-layer sliding engagement between the valve plate assembly and the valve body and the pressure regulating component makes the valve plate assembly run smoothly when moving horizontally. The APL valve is suitable for horizontal installation. Attached Figure Description

[0009] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the APL valve provided in Embodiment 1 of the present invention; Figure 2 This is a cross-sectional view of the APL valve provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the valve plate assembly provided in Embodiment 1 of the present invention; Figure 4 This is an exploded view of the APL valve provided in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the airway of the respiratory anesthesia device provided in Embodiment 3 of the present invention; Figure 6 This is a schematic diagram of the front panel of the respiratory anesthesia device provided in Embodiment 3 of the present invention. Detailed Implementation

[0010] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Rather, embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0011] In the APL valve of this invention, one end of the first elastic element abuts against the pressure regulating component inside the valve body, and the other end abuts against the valve plate assembly. A first sliding portion extending from the bottom outer periphery of the valve plate assembly is sandwiched between the valve body and the pressure regulating component, and is slidably connected to both the valve body and the pressure regulating component. Under the action of the first elastic element, the bottom of the valve plate assembly covers the air inlet, cutting off the gas communication between the air inlet and the air outlet. When the air pressure at the air inlet reaches or exceeds the elastic force of the first elastic element, the gas pushes the valve plate assembly to move horizontally, so that it no longer covers the air inlet. The gas passes through the third groove extending from the bottom outer periphery of the valve plate assembly to the air outlet, and the air inlet and the air outlet are connected. When the air pressure at the air inlet is less than the elastic force of the first elastic element, the first elastic element pushes the valve plate assembly to move horizontally in the opposite direction. The multi-layer sliding engagement between the valve plate assembly and the valve body and the pressure regulating component makes the valve plate assembly run smoothly when moving horizontally. The APL valve is suitable for horizontal installation.

[0012] Figure 1 This is a schematic diagram of the APL valve provided in Embodiment 1 of the present invention. Figure 2 This is a cross-sectional view of the APL valve provided in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the valve plate assembly provided in Embodiment 1 of the present invention. Figure 1 , Figure 2 and Figure 3As shown, the APL valve is horizontally positioned and includes a valve seat assembly 1, a pressure regulating assembly 2, a valve plate assembly 3, and a first elastic element 4. The valve seat assembly 1 includes an inlet 11, an outlet 12, and a valve body 13. The pressure regulating assembly 2 is movably installed within the valve body 13. The valve plate assembly 3 is located within the valve body 13, horizontally opposite to the pressure regulating assembly 2, forming an air chamber for controlling the opening and closing of the inlet 11 and outlet 12. The first elastic element 4 is located within this air chamber, with one end abutting against the pressure regulating assembly 2 and the other end abutting against the valve plate assembly 3. The elastic force of the first elastic element 4 is horizontal. Movement of the pressure regulating assembly 2 relative to the valve body 13 changes the compression of the first elastic element 4, thereby adjusting the opening pressure of the APL valve.

[0013] In this embodiment of the invention, the valve plate assembly 3 includes a bottom 31, a first sliding portion 32, and a third groove 36. The first sliding portion 32 extends vertically from a portion of the outer periphery of the bottom 31 and is sandwiched between the valve body 13 and the pressure regulating assembly 2, respectively slidably connected to the valve body 13 and the pressure regulating assembly 2. The air outlet 12 penetrates a portion of the valve body 13 and is located on the outer wall of the first sliding portion 32 and the pressure regulating assembly 2. The cross-sections of the valve body 13 and the pressure regulating assembly 2 can be circular, elliptical, or racetrack-shaped, etc., and can also be different, which is not limited here. For smooth sliding, there are multiple first sliding portions 32, evenly and spaced apart in the space between the valve body 13 and the pressure regulating assembly 2. During sliding, the outer wall of the first sliding portion 32 is in contact with the valve body 13, and its inner wall is in contact with the pressure regulating assembly 2.

[0014] The third groove 36 extends vertically from the outer periphery of the bottom 31 and is sandwiched between the valve body 13 and the pressure regulating assembly 2. The extension direction of the third groove 36 is the same as the extension direction of the first sliding part 32, and its extension length is not shorter than the extension length of the first sliding part 32. For smooth sliding, there are multiple third grooves 36, which are evenly and spaced apart in the space between the valve body 13 and the pressure regulating assembly 2.

[0015] The bottom 31 is used to control the connection between the air inlet 11 and the air outlet 12. When the air pressure at the air inlet 11 is less than the elastic force of the first elastic member 4, the bottom 31 covers the air inlet 11, cutting off the gas connection between the air inlet 11 and the air outlet 12. When the air pressure at the air inlet 11 reaches or exceeds the elastic force of the first elastic member 4, the gas pushes the bottom 31 to move horizontally, so that it no longer covers the air inlet 11, and the gas flows through the third groove 36 and the outer wall of the pressure regulating component 2, and then to the air outlet 12.

[0016] To ensure smooth sliding, in one embodiment of the invention, the valve assembly 3 further includes a second sliding portion 34. The second sliding portion 34 extends vertically from the bottom 31, with its extension direction being the same as that of the first sliding portion 32. A first groove 33 is formed between the first sliding portion 32 and the second sliding portion 34. The pressure regulating component 2 is clamped in the first groove 33 and slidably connected to both the first sliding portion 32 and the second sliding portion 34. During sliding, the outer wall of the pressure regulating component 2 is in contact with the first sliding portion 32, and its inner wall is in contact with the second sliding portion 34. The multi-layered sliding engagement formed by the valve body 13, the first sliding portion 32, the pressure regulating component 2, and the second sliding portion 34 makes the valve assembly 3 operate more smoothly when moving horizontally.

[0017] Preferably, the second sliding part 34 surrounds and forms a second groove 35, which, together with the pressure regulating component 2, forms an air cavity. The size of the second groove 35 is approximately matched with that of the first elastic member 4, which is disposed within the air cavity, partially or entirely within the second groove 35. A portion of the pressure regulating component 2 can be inserted into the second groove 35 to change the compression of the first elastic member 4. The second groove 35 accommodates the first elastic member 4, ensuring the coaxiality of the first elastic member 4 when placed horizontally, and improving the accuracy of air pressure control.

[0018] Furthermore, the pressure regulating component 2 has a damping hole 5 that connects the air chamber and the air outlet 12 to prevent the valve plate assembly 3 from vibrating due to excessively rapid movement. The extension length of the second sliding part 34 is greater than that of the first sliding part 32 to expand the range of the opening pressure of the APL valve.

[0019] In the APL valve of this invention, one end of the first elastic element abuts against the pressure regulating component inside the valve body, and the other end abuts against the valve plate assembly. A first sliding portion extending from the bottom outer periphery of the valve plate assembly is sandwiched between the valve body and the pressure regulating component, and is slidably connected to both the valve body and the pressure regulating component. Under the action of the first elastic element, the bottom of the valve plate assembly covers the air inlet, cutting off the gas communication between the air inlet and the air outlet. When the air pressure at the air inlet reaches or exceeds the elastic force of the first elastic element, the gas pushes the valve plate assembly to move horizontally, so that it no longer covers the air inlet. The gas passes through the third groove extending from the bottom outer periphery of the valve plate assembly to the air outlet, and the air inlet and the air outlet are connected. When the air pressure at the air inlet is less than the elastic force of the first elastic element, the first elastic element pushes the valve plate assembly to move horizontally in the opposite direction. The multi-layer sliding engagement between the valve plate assembly and the valve body and the pressure regulating component makes the valve plate assembly run smoothly when moving horizontally. The APL valve is suitable for horizontal installation.

[0020] Figure 4 This is an exploded view of the APL valve provided in Embodiment 2 of the present invention. In this embodiment of the present invention, the components of the APL valve that are the same as those in Embodiment 1 are referred to by the same reference numerals as those in Embodiment 1, including all the features described in Embodiment 1, which will not be repeated here.

[0021] like Figure 1 , Figure 2 and Figure 4 As shown, the pressure regulating assembly 2 includes a slide cylinder 21, a knob 22, and a pressurizing assembly 23. The slide cylinder 21 is threadedly connected to the valve body 13. A first sliding part 32 is clamped between one end of the valve body 13 and the slide cylinder 21. The knob 22 is fastened to the other end of the slide cylinder 21. The pressurizing assembly 23 abuts against the first elastic element 4. When the knob 22 is rotated, it drives the slide cylinder 21 to rotate, causing relative movement between the slide cylinder 21 and the valve body 13, which in turn drives the pressurizing assembly 23 to move, adjusting the compression of the first elastic element 4.

[0022] In this embodiment of the invention, the inner wall of the valve body 13 is provided with internal threads, and the outer wall of the slide cylinder 21 is provided with external threads. The slide cylinder 21 and the valve body 13 are movably installed through a threaded fit. The slide cylinder 21 and the valve body 13 can also be movably installed through a spiral groove or a slider, etc., which is not limited here. On the outer wall of the end of the slide cylinder 21 away from the first sliding part 32, the knob 22 and the slide cylinder 21 are fastened together by multiple screws or set screws. The pressure assembly 23 is restricted by the slide cylinder 21 in the horizontal direction. When the slide cylinder 21 rotates, the pressure assembly 23 moves with the slide cylinder 21 in the direction of relative movement between the slide cylinder 21 and the valve body 13, pressing or releasing the first elastic member 4.

[0023] Rotating the slide cylinder 21 moves it towards pressing the first elastic element 4. When the slide cylinder 21 abuts against the bottom 31 of the valve plate assembly 3, the first elastic element 4 is at its maximum compression, and the APL valve is closed. A second set screw 131 is provided on the inner wall of the valve body 13, and a second flange 213 is provided on the outer wall of the slide cylinder 21. Rotating the slide cylinder 21 moves it towards relaxing the first elastic element 4. When the second flange 213 abuts against the second set screw 131 and is limited, the first elastic element 4 is at its minimum compression, and the APL valve has its minimum opening pressure.

[0024] In this embodiment of the invention, the pressurizing assembly 23 includes a pressurizing shaft 231 and a second elastic member 232. The pressurizing shaft 231 passes through the slide cylinder 21 and abuts against the first elastic member 4. The second elastic member 232 is sleeved on the pressurizing shaft 231, with one end connected to the slide cylinder 21 and the other end connected to the pressurizing shaft 231.

[0025] After rotating the slide cylinder 21 to the appropriate position, maintain the relative position between the slide cylinder 21 and the valve body 13, that is, maintain the opening pressure of the APL valve. When temporary pressurization is required, press the pressure shaft 231. The pressure shaft 231, under external force, compresses the second elastic element 232 and moves relative to the slide cylinder 21, increasing the compression of the first elastic element 4. When the external force is removed, the pressure shaft 231 resets under the elastic force of the second elastic element 232, and the APL valve returns to its opening pressure.

[0026] The pressure shaft 231 includes a pressing plate 2311 located at the end of the pressure shaft 231 away from the first elastic member 4. The pressing plate 2311 is located inside the knob 22 and is slidably connected to the knob 22, and its pressing surface is basically flush with the knob 22, which facilitates the pressing operation by medical personnel. The pressing plate 2311 has a preset thickness. When the pressure shaft 231 is pressed by external force, the pressing plate 2311 slides a certain distance inside the knob 22 and then abuts against the end of the slide cylinder 21 away from the first sliding part 32, limiting the pressure shaft 231 and restricting the amount of temporary pressure.

[0027] Preferably, the slide 21 includes a first step 211 extending inward from its inner wall, and the pressurizing assembly 23 includes a first flange 233 extending outward from the outer wall of the pressurizing shaft 231. The second elastic member 232 is received in the space formed by the first step 211, the first flange 233, the inner wall of the slide 21, and the outer wall of the pressurizing shaft 231, with one end abutting against the first step 211 and the other end abutting against the first flange 233.

[0028] When the pressure shaft 231 slides inside the slide cylinder 21 and the pressing plate 2311 slides inside the knob 22, the first step 211, the first flange 233 and the slide cylinder 21, and the pressing plate 2311 and the knob 22 form three points of support for the pressure shaft 231 in the horizontal direction, so that the pressure shaft 231 and the pressing plate 2311 can always maintain translation.

[0029] To prevent the pressure shaft 231 from popping out when it resets, as an embodiment of the present invention, the slide cylinder 21 further includes a first set screw 212 extending inward from its inner wall. When the external force is removed, the pressure shaft 231 resets, and the first set screw 212 abuts against the end of the first flange 233 away from the second elastic member 232, thereby limiting the pressure shaft 231.

[0030] In the APL valve of this invention, one end of the first elastic element abuts against the pressure regulating component inside the valve body, and the other end abuts against the valve plate assembly. A first sliding portion extending from the bottom outer periphery of the valve plate assembly is sandwiched between the valve body and the pressure regulating component, and is slidably connected to both the valve body and the pressure regulating component. Under the action of the first elastic element, the bottom of the valve plate assembly covers the air inlet, cutting off the gas communication between the air inlet and the air outlet. When the air pressure at the air inlet reaches or exceeds the elastic force of the first elastic element, the gas pushes the valve plate assembly to move horizontally, so that it no longer covers the air inlet. The gas passes through the third groove extending from the bottom outer periphery of the valve plate assembly to the air outlet, and the air inlet and the air outlet are connected. When the air pressure at the air inlet is less than the elastic force of the first elastic element, the first elastic element pushes the valve plate assembly to move horizontally in the opposite direction. The multi-layer sliding engagement between the valve plate assembly and the valve body and the pressure regulating component makes the valve plate assembly run smoothly when moving horizontally. The APL valve is suitable for horizontal installation.

[0031] Figure 5This is a schematic diagram of the airway of the respiratory anesthesia device provided in Embodiment 3 of the present invention. Figure 6 This is a schematic diagram of the front panel of the respiratory anesthesia device provided in Embodiment 3 of the present invention.

[0032] In this embodiment of the invention, the components of the APL valve that are the same as those in Embodiment 1 and Embodiment 2 use the same reference numerals as those in Embodiment 1 and Embodiment 2, and include all the features described in Embodiment 1 and Embodiment 2, which will not be repeated here.

[0033] like Figure 5 and Figure 6 As shown, the respiratory anesthesia device includes an inspiratory branch, an expiratory branch, a driving gas branch, a fresh gas branch, and a patient-end branch. The inspiratory branch is the section from the driving gas branch through the carbon dioxide absorption chamber and the inspiratory one-way valve to the patient-end branch. The expiratory branch is the section from the patient-end branch through the expiratory one-way valve to the driving gas branch. The fresh gas branch connects to the inspiratory branch from the tubing between the carbon dioxide absorption chamber and the inspiratory one-way valve. Fresh gas is a mixture of at least one of air and oxygen with the anesthetic gas in the anesthetic vaporizer, and may also contain nitrous oxide, etc. A float flow meter and pressure gauge are installed in the fresh gas branch. The driving gas branch includes a manual driving gas branch and a machine-controlled driving gas branch. A switching valve selectively connects either the manual or machine-controlled driving gas branch to provide driving gas. The driving gas branch connects to the tubing between the expiratory one-way valve and the carbon dioxide absorption chamber to link the inspiratory and expiratory branches.

[0034] An airbag and APL valve are installed in the manually driven air branch. When connected to the manually driven air branch, during inhalation, the airbag is manually propelled outwards, the expiratory check valve closes, and the propellant gas passes through the carbon dioxide absorption chamber, mixes with fresh gas, and then reaches the patient's branch via the inhalation check valve. During exhalation, the inhalation check valve closes, the patient's exhaled gas passes through the expiratory check valve, and fresh gas passes through the carbon dioxide absorption chamber; the two mix and flow to the airbag and APL valve. When the airbag is full of gas, the pressure in the tubing between the airbag and the APL valve reaches its maximum value, which is also the opening pressure of the APL valve. The APL valve then opens to control the pressure.

[0035] To reduce the maximum air pressure in the pipeline, rotate knob 22 to move the slide cylinder 21 and pressurizing assembly 23 away from the first elastic element 4, reducing the compression of the first elastic element 4. To increase the maximum air pressure in the pipeline, rotate knob 22 to move the slide cylinder 21 and pressurizing assembly 23 towards the first elastic element 4, increasing the compression of the first elastic element 4. To temporarily increase pressure, press and hold the pressure plate 2311; a preset pressure will be added to the maximum air pressure in the pipeline. To close the APL valve, rotate knob 22 to move the slide cylinder 21 and pressurizing assembly 23 towards the first elastic element 4 until the slide cylinder 21 abuts against the bottom 31 of the valve plate assembly 3.

[0036] While adjusting the maximum air pressure in the pipeline by turning knob 22, it is also necessary to constantly observe the readings of the float flowmeter and pressure gauge. The float flowmeter usually needs to be installed vertically, and medical personnel should observe it through a horizontal line of sight. Figure 6 As shown, the APL valve, float flow meter, and pressure gauge are mounted on the same vertical panel of the respiratory anesthesia equipment. The valve body 13 of the APL valve is horizontally fixed to the vertical panel of the respiratory anesthesia equipment, while the knob 22 and the press plate 2311 are horizontally exposed outside the equipment. Scales are provided on the knob 22 or the vertical panel of the respiratory anesthesia equipment. Medical personnel can simultaneously operate and observe the APL valve, float flow meter, and pressure gauge through the same horizontal line of sight.

[0037] In addition to being suitable for horizontal installation, the APL of this invention is also suitable for installation in other directions, and no limitation is made here.

[0038] In the APL valve of this invention, one end of the first elastic element abuts against the pressure regulating component inside the valve body, and the other end abuts against the valve plate assembly. A first sliding portion extending from the bottom outer periphery of the valve plate assembly is sandwiched between the valve body and the pressure regulating component, and is slidably connected to both the valve body and the pressure regulating component. Under the action of the first elastic element, the bottom of the valve plate assembly covers the air inlet, cutting off the gas communication between the air inlet and the air outlet. When the air pressure at the air inlet reaches or exceeds the elastic force of the first elastic element, the gas pushes the valve plate assembly to move horizontally, so that it no longer covers the air inlet. The gas passes through the third groove extending from the bottom outer periphery of the valve plate assembly to the air outlet, and the air inlet and the air outlet are connected. When the air pressure at the air inlet is less than the elastic force of the first elastic element, the first elastic element pushes the valve plate assembly to move horizontally in the opposite direction. The multi-layer sliding engagement between the valve plate assembly and the valve body and the pressure regulating component makes the valve plate assembly run smoothly when moving horizontally. The APL valve is suitable for horizontal installation.

[0039] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An APL valve, characterized in that, include: The valve seat assembly (1) includes an air inlet (11), an air outlet (12), and a valve body (13). The pressure regulating component (2) is movably installed inside the valve body (13); The valve plate assembly (3) includes a bottom (31), a first sliding portion (32) and a third groove (36); The first elastic element (4) has one end abutting against the pressure regulating assembly (2) and the other end abutting against the valve plate assembly (3). The first sliding part (32) extends from a portion of the outer periphery of the bottom (31) along its vertical direction and is sandwiched between the valve body (13) and the pressure regulating component (2), and is slidably connected to the valve body (13) and the pressure regulating component (2) respectively; the third groove (36) extends from a portion of the outer periphery of the bottom (31) along the vertical direction; the bottom (31) is used to control the opening and closing between the air inlet (11) and the air outlet (12).

2. The APL valve according to claim 1, characterized in that, The valve plate assembly (3) further includes a second sliding portion (34), which extends from the bottom (31) along the vertical direction; a first groove (33) is formed between the first sliding portion (32) and the second sliding portion (34), and the pressure regulating assembly (2) is clamped in the first groove (33) and slidably connected to the first sliding portion (32) and the second sliding portion (34) respectively.

3. The APL valve according to claim 2, characterized in that, The second sliding part (34) surrounds and forms a second groove (35), and the first elastic member (4) is partially or entirely disposed in the second groove (35).

4. The APL valve according to claim 2, characterized in that, The extension length of the second sliding part (34) is greater than the extension length of the first sliding part (32).

5. The APL valve according to any one of claims 1-4, characterized in that, The pressure regulating component (2) includes a slide (21), a knob (22), and a pressurizing component (23); The slide cylinder (21) is threadedly connected to the valve body (13), and the first sliding part (32) is sandwiched between one end of the valve body (13) and the slide cylinder (21); The pressurizing component (23) abuts against the first elastic element (4); The knob (22) is fastened to the other end of the slide (21). When the knob (22) rotates, it drives the slide (21) to rotate, so that the slide (21) and the valve body (13) move relative to each other and drive the pressurizing component (23) to move, thereby adjusting the compression amount of the first elastic element (4).

6. The APL valve according to claim 5, characterized in that, The pressurizing assembly (23) includes a pressurizing shaft (231) and a second elastic element (232); The pressure shaft (231) passes through the slide cylinder (21) and abuts against the first elastic member (4). The second elastic member (232) is sleeved on the pressure shaft (231), with one end connected to the slide cylinder (21) and the other end connected to the pressure shaft (231). When the pressure shaft (231) is pressed by an external force, it moves relative to the slide cylinder (21), increasing the compression of the first elastic element (4), and resets when the external force is removed.

7. The APL valve according to claim 6, characterized in that, The pressure shaft (231) includes a pressing plate (2311); The pressing plate (2311) is located at the end of the pressure shaft (231) away from the first elastic element (4) and is slidably connected to the knob (22); When the pressure shaft (231) is pressed by the external force, the pressing plate (2311) abuts against the end of the slide cylinder (21) away from the first sliding part (32) to limit the pressure shaft (231).

8. The APL valve according to claim 6, characterized in that, The slide (21) includes a first step (211) extending inward from its inner wall, and the pressurizing assembly (23) also includes a first flange (233) extending outward from the outer wall of the pressurizing shaft (232). One end of the second elastic member (232) abuts against the first step (211), and the other end abuts against the first flange (233).

9. The APL valve according to claim 8, characterized in that, The slide (21) also includes a first set screw (212) extending inward from its inner wall; When the external force is removed, the pressure shaft (231) is reset, and the first set screw (212) abuts against the first flange (233) to limit the pressure shaft (231).

10. A respiratory anesthesia device, characterized in that, It includes an inhalation branch, an exhalation branch, a manual driving gas branch, a fresh gas branch, and a patient end branch. The fresh gas branch is used to draw fresh gas into the inhalation branch. The manual driving gas branch is used to provide driving gas. The driving gas is mixed with the fresh gas and then reaches the patient end branch. A flow meter and a pressure gauge are installed in the fresh gas branch, and an APL valve as described in any one of claims 1-9 is installed in the manually driven gas branch for gas pressure control.

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