Constant pressure valve with pressure regulating structure

Abstract

The application discloses a constant pressure valve with pressure regulating structure, which comprises a valve body, a regulating part, a piston assembly and an elastic part, wherein the valve body comprises a valve cavity, a first channel, a second channel and a regulating cavity; one end of the first channel is communicated with an air inlet; the other end of the first channel is provided with an air inlet hole communicated with the valve cavity; the other end of the second channel is communicated with an air outlet; the regulating part is partially embedded into the regulating cavity; the piston assembly divides a containing cavity into an upper cavity and a lower cavity; the piston assembly extends to the valve cavity; the piston assembly is provided with a first cavity communicated with the valve cavity and the upper cavity; the elastic part is sleeved on the piston assembly; one end of the elastic part is abutted against the upper end of the piston assembly; the other end of the elastic part is abutted against the bottom surface of the regulating part; in the movement process of the regulating part, the regulating part drives the elastic part to move towards or away from the valve body; the structure has the effects of constant pressure and pressure regulation; and the number of parts is small; only one elastic part is needed to realize the functions of constant pressure and pressure regulation.

Description

Technical Field

[0001] This invention relates to the field of aquariums, and more specifically to a constant pressure valve with a pressure regulating structure. Background Technology

[0002] A constant pressure valve is a valve device that maintains a stable outlet pressure. Existing constant pressure valves include two types. One type uses a spring and piston in cooperation to achieve a constant pressure effect. However, this structure has a problem: one end of the spring abuts against the valve seat, making it impossible to effectively adjust the spring's compression distance, thus failing to achieve a regulating effect; it only provides a constant pressure function. The other type uses multiple springs and pistons in cooperation to achieve both constant pressure and regulating effect. However, this structure has the problem of numerous parts and low assembly efficiency. Summary of the Invention

[0003] Therefore, the technical problem to be solved by this invention is how to achieve both constant pressure and pressure regulation. To this end, this invention provides a constant pressure valve with a pressure regulating structure, comprising: The valve body includes a valve cavity, a first channel, a second channel, and an adjustment cavity. The valve cavity and the adjustment cavity are independently configured. One end of the first channel is connected to an air inlet, and the other end of the first channel is provided with an air inlet hole that communicates with the valve cavity. One end of the second channel is connected to the valve cavity, and the other end of the second channel is connected to an air outlet. An adjusting member, wherein the adjusting member is partially embedded in the adjusting cavity, the adjusting member moves relative to the adjusting cavity, and the adjusting member is provided with a receiving cavity; A piston assembly, the upper end of which extends into the receiving cavity and divides the receiving cavity into an upper chamber and a lower chamber, the lower end of which extends through the bottom surface of the adjusting member to the valve chamber, the piston assembly moves to close or open the air inlet port; the piston assembly is provided with a first chamber, the first chamber being connected to the valve chamber and the upper chamber respectively; An elastic element is housed in the lower chamber and sleeved on the piston assembly. One end of the elastic element abuts against the upper end of the piston assembly, and the other end of the elastic element abuts against the bottom surface of the adjusting member. During the movement of the adjusting member, the adjusting member drives the elastic element to move toward or away from the valve body.

[0004] With this structural design, under normal conditions, after gas enters the valve chamber, it pushes open the piston assembly, causing the air inlet to open. The gas then exits through the valve chamber to the outlet. Simultaneously, gas also enters the upper chamber through the first chamber of the piston assembly. When gas accumulates in the upper chamber, it pushes the piston assembly towards the air inlet, effectively closing it. Once the air inlet is closed, the gas in the upper chamber exits through the first chamber to the outlet. When the pressure applied to the piston assembly changes, the piston assembly moves away from the air inlet, opening it again, and this cycle repeats. When pressure regulation is required, the pressure regulating component moves the piston assembly and the elastic element synchronously. For example, the pressure regulating component moves the piston assembly and the elastic element away from the air inlet. This changes the distance between the elastic element and the air inlet, altering the compression distance of the elastic element. This requires a greater force from the upper chamber to drive the piston assembly, thus achieving pressure regulation. This structure provides both constant and regulating pressure with fewer components; only one elastic element is needed to achieve these functions.

[0005] The adjusting member and the adjusting cavity are connected by a thread.

[0006] The threaded connection makes adjusting the adjustment mechanism more convenient. Alternatively, a gear-type structure or other structural combinations can be used to achieve the same adjustment effect.

[0007] It also includes a limiting member that extends through the valve body to the adjusting cavity. The adjusting member and the limiting member form a stop engagement in the moving direction to prevent the adjusting member from passing over the limiting member.

[0008] The setting of the limiting component creates a limiting effect, ensuring that the adjusting component can only move within the set range.

[0009] The valve body is provided with a first through hole, the limiting member is accommodated in the first through hole, and the limiting member is threadedly connected to the inner wall of the first through hole.

[0010] The use of threaded connections makes it easier to fix and adjust the limiting components.

[0011] The adjusting component includes an adjusting cover and an adjusting knob. The adjusting knob is connected and fixed to the adjusting cover. During the movement of the adjusting cover, the adjusting knob moves synchronously. Alternatively, the adjusting component is an integral structure.

[0012] When the adjusting cover and adjusting knob are separate, the piston assembly can be installed through the receiving cavity during assembly. After installation, the adjusting knob is used to fix the assembly. When they are integrated, the piston assembly is extended into the valve cavity during assembly to adjust and fix the adjusting component. Finally, the limiting component is used to fix the adjustment.

[0013] The adjusting cover and the adjusting knob are connected by a thread, and the adjusting knob can move relative to the adjusting cover.

[0014] The bottom surface of the adjusting member is provided with a limiting protrusion, which restricts the elastic member from moving outward in the radial direction.

[0015] The setting of the limiting protrusion forms a limiting and fixing effect on the elastic element, preventing the elastic element from moving and affecting actual use.

[0016] The valve body is provided with a fixed post, and the fixed post has a through channel. The channel is part of the valve cavity. The fixed post and the upper part of the valve body cooperate to form the adjustment cavity. The adjustment element slides along the side wall of the fixed post.

[0017] The fixed column serves as a guide for the piston assembly and also for the adjusting components, creating a dual-guiding effect and improving the overall stability of the movement.

[0018] The piston assembly includes a piston body and a first seal, which is fixed to the piston body and can close or open the air inlet.

[0019] The piston assembly further includes a second seal, which is fitted onto the piston body and abuts against the side wall of the valve chamber. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a constant pressure valve with a pressure regulating structure provided by the present invention; Figure 2 A cross-sectional view of a constant pressure valve with a pressure regulating structure provided by the present invention; Figure 3A cross-sectional view of gas flow in the working state of a constant pressure valve with a pressure regulating structure provided by the present invention; Figure 4 A cross-sectional view of a constant pressure valve with a pressure regulating structure after pressure regulation by the regulating element, provided by the present invention; Figure 5 This is a cross-sectional view of another form of a constant pressure valve with a pressure regulating structure provided by the present invention. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example

[0026] This embodiment provides a constant pressure valve with a pressure regulating structure, as shown in the attached figure. Figures 1-5 As shown, it includes: The valve body 11 includes a valve cavity 111, a first channel 112, a second channel 113, and an adjustment cavity 114. The valve cavity 111 and the adjustment cavity 114 are independently configured. In this embodiment, the valve cavity 111 and the adjustment cavity 114 are connected to each other. However, after the piston assembly is installed, the gas can only enter the upper chamber 122 through the piston assembly. One end of the first channel 112 is connected to an air inlet 115, and the other end of the first channel 112 is provided with an air inlet 116 that communicates with the valve cavity 111. The gas (specifically, the gas refers to the carbon dioxide gas produced by the neutralization reaction in the carbon dioxide cylinder) enters the valve body 11 through the air inlet 115 and then enters the valve cavity 111 through the air inlet 116. It should be noted that when gas does not flow into the valve body 11, the air inlet 116 can be closed by the piston assembly, which is equivalent to the air inlet 115 and the valve chamber 111 being independently configured; or, when gas does not flow into the valve body 11, there is a gap between the piston assembly and the air inlet 116, allowing external gas to enter the valve chamber 111 through the air inlet 116. Those skilled in the art can adjust this according to actual needs. When the air inlet 116 is open, the air inlet 115 connects to the valve chamber 111, creating a gas flow effect. One end of the second channel 113 connects to the valve chamber 111, and the other end connects to the air outlet 117. The second channel 113 is always connected, meaning that when the air inlet 116 is open, gas can be discharged through the valve chamber 111 to the air outlet 117, achieving a stable gas supply effect.

[0027] An adjusting member 12 is partially embedded in an adjusting cavity 114. The adjusting member 12 moves relative to the adjusting cavity 114. In this embodiment, the adjusting cavity 114 is located in the upper region of the valve body 11. The adjusting member 12 is partially embedded within the adjusting cavity 114 and partially located outside the valve body 11. In this embodiment, the bottom surface of the adjusting member 12 can be in contact with the bottom surface of the adjusting cavity 114, or a gap can be formed between the bottom surface of the adjusting member 12 and the bottom surface of the adjusting cavity 114 through the movement of the adjusting member 12. The height range of this gap can be adjusted according to actual needs. When the bottom surface of the adjusting member 12 abuts against the bottom surface of the adjusting cavity 114, the gap is 0. The adjusting member 12 has a receiving cavity 121, which opens downwards, allowing the piston assembly to pass through the opening and enter the receiving cavity 121.

[0028] The piston assembly extends from its upper end into the receiving cavity 121, dividing the cavity into an upper chamber 122 and a lower chamber 123. The upper chamber 122 is located above the lower chamber 123, and the upper and lower chambers 122 are independently configured and not connected. The lower end of the piston assembly extends through the bottom surface of the adjusting member 12 to the valve chamber 111. Movement of the piston assembly closes or opens the air inlet 116. In this embodiment, the piston assembly reciprocates up and down. When the piston assembly moves downward, its lower end fits against the air inlet 116, effectively closing it. Conversely, when the piston assembly moves upward, a gap forms between its lower end and the air inlet 116, opening it. The piston assembly seals the connection between the valve chamber 111 and the lower chamber 123, ensuring that the two chambers are independent and there is no gas communication between them. It should also be noted that the lower chamber 123 and the regulating chamber 114 can be connected or disconnected, and those skilled in the art can adjust this according to actual needs. The piston assembly has a first chamber 131, which is connected to the valve chamber 111 and the upper chamber 122. When gas pushes the piston assembly upward, some gas is discharged through the valve chamber 111 to the outlet 117, and some gas is discharged through the valve chamber 111 to the first chamber 131 and then to the upper chamber 122. When the gas in the upper chamber 122 accumulates to a certain amount, a pressure difference is generated between the upper chamber 122 and the lower chamber 123. At this time, the gas in the upper chamber 122 will push the piston assembly downward, forming a closed air inlet 116. When the air inlet 116 is closed, external gas cannot enter, and the gas in the upper chamber 122 passes through the first chamber 131 to the valve chamber 111 and is finally discharged from the outlet 117. When the gas in the upper chamber 122 flows out, the pressure difference decreases, and the force applied to the piston assembly decreases. In other words, the gas in the upper chamber 122 exerts a downward force on the piston assembly, and the external gas exerts an upward force on the piston assembly. When the downward force is less than the upward force, the air inlet 116 opens; conversely, when the downward force is greater than the upward force, the air inlet 116 closes, thereby achieving reciprocating motion and ultimately achieving a constant pressure effect.

[0029] An elastic element 14 is housed in the lower chamber 123 and sleeved on the piston assembly. One end of the elastic element 14 abuts against the upper end of the piston assembly, and the other end abuts against the bottom surface of the adjusting element 12. When the downward force is greater than the upward force, the gas in the upper chamber 122 exerts a downward force on the piston assembly, requiring the elastic force of the elastic element 14 to be overcome, thereby pushing the piston assembly downward. During the movement of the adjusting element 12, the adjusting element 12 drives the elastic element 14 to move towards or away from the valve body 11. Compared to the prior art, in the prior art, the bottom surface of the elastic element 14 always abuts against the valve body 11, and the compression distance of the elastic element 14 is constant. In this embodiment, the adjusting element 12 drives the elastic element 14 to move, so that the elastic element 14 moves as a whole with the adjusting element 12. At this time, the distance between the bottom surface of the elastic element 14 and the valve body 11 also changes, and the compression distance of the elastic element 14 also changes. For example, when the adjusting element 12 rises by 1 mm, the compression distance of the elastic element 14 shortens by 1 mm. At this time, the gas in the upper chamber 122 needs to overcome the increased elasticity of the elastic element 14, requiring a greater pressure difference to achieve the downward movement of the piston assembly. In this case, a pressure greater than normal is required. The corresponding pressure value can be adjusted according to actual needs. For example, if the adjusting key rises by 1 mm, the gas in the upper chamber 122 needs to increase its pressure by 1 MPa to achieve the downward movement of the piston assembly. (See attached...) Figure 2 As shown, the compression length of the elastic element 14 is H1, as per the attached diagram. Figure 4 As shown, after the adjusting member 12 moves upward, the compression length of the elastic member 14 is H2, and H1 is greater than H2.

[0030] With this structural design, under normal conditions, after gas enters the valve chamber 111, the gas pushes open the piston assembly, causing the air inlet 116 to open. At this time, the gas is discharged through the valve chamber 111 to the air outlet 117. Simultaneously, the gas also enters the upper chamber 122 through the first chamber 131 of the piston assembly. When the gas accumulates in the upper chamber 122, it pushes the piston assembly towards the side of the air inlet 116, achieving the effect of closing the air inlet 116. When the air inlet 116 is closed, the gas in the upper chamber 122 is discharged through the first chamber 131 to the air outlet 117. When the pressure applied to the piston assembly changes, the piston assembly moves away from the air inlet 116, causing the air inlet 116 to open, and so on. When pressure regulation is required, the pressure regulating component drives the piston assembly and the elastic element 14 to move synchronously. For example, the pressure regulating component drives the piston assembly and the elastic element 14 to move away from the air inlet 116. At this time, the distance between the elastic element 14 and the air inlet 116 changes, and the compression distance of the elastic element 14 also changes. The force required for the upper chamber 122 to drive the piston assembly to move is greater, thereby achieving the effect of pressure regulation.

[0031] Specifically, as shown in the attached document Figures 1-5 As shown, the adjusting component 12 and the adjusting cavity 114 are connected by a thread. This threaded connection makes adjusting the adjusting component 12 more convenient. Alternatively, a gear mechanism or other structural combinations can be used to achieve the same adjustment effect. A gap is formed between the adjusting component 12 and the adjusting cavity 114, allowing the adjusting cavity 114 to communicate with external gas. In this case, as long as the air pressure in the upper chamber 122 is greater than normal atmospheric pressure, the air pressure in the upper chamber 122 can drive the piston assembly.

[0032] Specifically, as shown in the attached document Figures 1-5 As shown, it also includes a limiting member 15, which extends through the valve body 11 to the regulating cavity 114. The regulating member 12 and the limiting member 15 form a stop engagement in the moving direction to prevent the regulating member 12 from passing over the limiting member 15. Here, the limiting member 15 is located on the upward movement trajectory of the regulating member 12. The setting of the limiting member 15 creates a limiting effect, so that the regulating member 12 can only move within a set range. In this embodiment, the lower end of the regulating member 12 has an external thread structure, and the inner wall of the regulating cavity 114 has an internal thread structure, forming a threaded engagement. In this embodiment, when the bottom surface of the regulating member 12 abuts against the bottom surface of the regulating cavity 114, the compression distance of the elastic member 14 is at its maximum. When the regulating member 12 moves upward, and the external thread of the regulating member 12 cannot pass over the limiting member 15, the compression distance of the elastic member 14 is at its minimum. The regulating member 12 slides up and down within this height space to achieve the pressure regulating effect, specifically by rotating the regulating member 12 to achieve the regulating effect.

[0033] Specifically, as shown in the attached document Figures 1-5 As shown, the valve body 11 has a first through hole 118, and the limiting member 15 is accommodated in the first through hole 118, and the limiting member 15 is threadedly connected to the inner wall of the first through hole 118. The threaded connection makes it easier to fix and adjust the limiting member 15.

[0034] Specifically, as shown in the attached document Figures 1-5 As shown, the bottom surface of the adjusting member 12 is provided with a second through hole 124, through which the piston assembly enters the receiving cavity 121. It should be noted that the bottom surface of the adjusting member 12 is not completely open; it includes the second through hole 124 and an extension 125. The extension 125 forms a sealed bottom, and the lower end of the elastic member 14 abuts against the extension 125, creating the effect that the adjusting member 12 drives the elastic member 14 to move together.

[0035] Specifically, as shown in the attached document Figure 2 , Figure 5As shown, the adjusting member 12 is an integral structure. The adjusting member 12 is a single component, and the piston assembly can extend into the receiving cavity 121 through the second through hole 124. The lower end of the piston assembly extends into the valve cavity 111, and is fixed by the adjustment of the adjusting member 12, and finally fixed by the limiting member 15.

[0036] Specifically, as shown in the attached document Figures 1-4 As shown, the adjusting component 12 includes an adjusting cover 126 and an adjusting knob 127. The adjusting knob 127 is connected and fixed to the adjusting cover 126, and is used to close the top surface of the adjusting cover 126 to form a sealing effect. During the movement of the adjusting cover 126, the adjusting knob 127 moves synchronously. When the adjusting cover 126 and the adjusting knob 127 are separate, during the assembly process, the piston assembly first passes through the top surface of the adjusting cover 126 and is inserted into the receiving cavity 121, and then is fixed by the adjusting knob 127. The second through hole 124 and the extension 125 are both provided in the adjusting cover 126.

[0037] Specifically, as shown in the attached document Figures 1-4 As shown, the adjusting cover 126 and the adjusting knob 127 are connected by a thread, and the adjusting knob 127 can move relative to the adjusting cover 126. The threaded connection of the adjusting knob 127 facilitates the installation and mating between the adjusting cover 126 and the adjusting knob 127.

[0038] Specifically, as shown in the attached document Figures 1-5 As shown, the bottom surface of the adjusting member 12 is provided with a limiting protrusion 128, which restricts the elastic member 14 from moving outward in the radial direction. The setting of the limiting protrusion 128 forms a limiting and fixing effect on the elastic member 14, preventing the elastic member 14 from moving and affecting actual use. Here, the limiting protrusion 128 is a ring structure, and the limiting protrusion 128 extends upward. In this embodiment, the limiting protrusion 128 is specifically set in the extension portion 125.

[0039] Specifically, as shown in the attached document Figures 1-5 As shown, the valve body 11 is provided with a fixing post 129, and the fixing post 129 has a through channel 120. The channel 120 is part of the valve cavity 111. The fixing post 129 and the upper part of the valve body 11 cooperate to form an adjusting cavity 114. The fixing post 129 extends upward, and at this time, the adjusting cavity 114 has an annular structure. The adjusting member 12 slides along the side wall of the fixing post 129. The setting of the fixing post 129 forms a guide for the movement of the piston assembly and also forms a guide for the movement of the adjusting member 12, forming a dual guiding effect and improving the stability of the overall movement.

[0040] Specifically, as shown in the attached document Figures 1-5As shown, the piston assembly includes a piston body 13 and a first seal 16. The first seal 16 is fixed to the piston body 13, specifically at the bottommost part of the piston body 13. The first seal 16 closes or opens the air inlet 116. Furthermore, the piston body 13 has a first fixing groove 132, into which the first seal 16 is embedded and fixed. A first chamber 131 is disposed within the piston body 13.

[0041] Specifically, in this embodiment, the upper end of the piston body 13 has a large diameter, and the lower end of the piston body 13 has a small diameter.

[0042] Specifically, as shown in the attached document Figures 1-5 As shown, the piston assembly also includes a second seal 17, which is fitted onto the piston body 13 and abuts against the side wall of the valve chamber 111. Furthermore, the piston body 13 has a second fixing groove, and the second seal 17 is fitted into the second fixing groove 133, creating a fixing effect. Here, the second seal 17 can be a sealing ring. The second seal 17 forms a separation between the valve chamber 111 and the lower chamber 123, making the valve chamber 111 and the lower chamber 123 independently configured.

[0043] Specifically, the upper end of the piston body 13 is provided with a third fixing groove 134, and a third sealing member 18 is fixed in the third fixing groove 134. The third sealing member 18 forms a seal between the upper chamber 122 and the lower chamber 123.

[0044] Specifically, the elastic element 14 is a straight spring or a conical spring, and the specifications and dimensions of the spring can be adjusted according to actual needs.

[0045] Specifically, as shown in the attached document Figures 1-5 As shown, there can be one air inlet 115, which connects to a carbon dioxide cylinder for gas supply. Alternatively, there can be two air inlets 115, one connected to the carbon dioxide cylinder for gas supply, and the other connected to a pressure gauge for pressure detection. Furthermore, the number of air inlets 115 can be increased, and those skilled in the art can adjust this according to actual needs. This embodiment describes two air inlets 115 as an example.

[0046] Specifically, as shown in the attached document Figures 1-5 As shown, the number of air outlets 117 can be one, two, or more, and those skilled in the art can adjust it according to actual needs. In this embodiment, two air outlets 117 are used as an example for description.

[0047] Specifically, this structure has the effects of constant pressure and pressure regulation, and has a small number of parts, requiring only one elastic element to achieve the functions of constant pressure and pressure regulation.

[0048] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A constant pressure valve having a pressure regulating structure, characterized by comprising: include: The valve body includes a valve cavity, a first channel, a second channel, and an adjustment cavity. The valve cavity and the adjustment cavity are independently configured. One end of the first channel is connected to an air inlet, and the other end of the first channel is provided with an air inlet hole that communicates with the valve cavity. One end of the second channel is connected to the valve cavity, and the other end of the second channel is connected to an air outlet. An adjusting member, wherein the adjusting member is partially embedded in the adjusting cavity, the adjusting member moves relative to the adjusting cavity, and the adjusting member is provided with a receiving cavity; A piston assembly, the upper end of which extends into the receiving cavity and divides the receiving cavity into an upper chamber and a lower chamber, the lower end of which extends through the bottom surface of the adjusting member to the valve chamber, the piston assembly moves to close or open the air inlet port; the piston assembly is provided with a first chamber, the first chamber being connected to the valve chamber and the upper chamber respectively; An elastic element is housed in the lower chamber and sleeved on the piston assembly. One end of the elastic element abuts against the upper end of the piston assembly, and the other end of the elastic element abuts against the bottom surface of the adjusting member. During the movement of the adjusting member, the adjusting member drives the elastic element to move toward or away from the valve body.

2. The constant pressure valve with pressure regulating structure according to claim 1, characterized in that, The adjusting component and the adjusting cavity are connected by a thread.

3. The constant pressure valve with a pressure regulating structure according to claim 1, characterized in that, It also includes a limiting member that extends through the valve body to the adjusting cavity, and the adjusting member and the limiting member form a stop engagement in the moving direction to prevent the adjusting member from passing the limiting member.

4. The constant pressure valve with a pressure regulating structure according to claim 3, characterized in that, The valve body is provided with a first through hole, the limiting member is accommodated in the first through hole, and the limiting member is threadedly connected to the inner wall of the first through hole.

5. The constant pressure valve with a pressure regulating structure according to claim 1, characterized in that, The adjusting component includes an adjusting cover and an adjusting knob. The adjusting knob is connected and fixed to the adjusting cover. During the movement of the adjusting cover, the adjusting knob moves synchronously. Alternatively, the adjusting component is an integral structure.

6. The constant pressure valve with a pressure regulating structure according to claim 5, characterized in that, The adjusting cover and the adjusting knob are connected by a thread, and the adjusting knob can move relative to the adjusting cover.

7. The constant pressure valve with a pressure regulating structure according to claim 1, characterized in that, The bottom surface of the adjusting member is provided with a limiting protrusion, which restricts the elastic member from moving outward in the radial direction.

8. The constant pressure valve with a pressure regulating structure according to claim 1, characterized in that, The valve body is provided with a fixed post, and the fixed post is provided with a through channel. The channel is part of the valve cavity. The fixed post and the upper part of the valve body cooperate to form the adjustment cavity. The adjustment member slides along the side wall of the fixed post.

9. The constant pressure valve with a pressure regulating structure according to claim 1, characterized in that, The piston assembly includes a piston body and a first seal, the first seal being fixed to the piston body and closing or opening the air inlet.

10. The constant pressure valve with a pressure regulating structure according to claim 9, characterized in that, The piston assembly further includes a second seal, which is fitted onto the piston body and abuts against the side wall of the valve chamber.

Images