High pressure air valve

Abstract

The utility model relates to a high pressure air valve, including valve body, casing, float ball, upper cover subassembly and valve clack subassembly, casing is fixed in the inner chamber of valve body, float ball is located in the inner chamber of casing, upper cover subassembly covers and is sealed butt joint in valve body, and upper cover subassembly includes cover body, and the first ventilation chamber is equipped in the middle part of cover body along the axial direction, and the bottom of cover body is equipped with sealing ring along the circumference, valve clack subassembly is located above float ball, and valve clack subassembly includes valve clack, and the boss for forming sealed cooperation with sealing ring is equipped on valve clack, when valve clack and cover body bottom close abut, the first ventilation chamber is closed. The utility model discloses the abutment design of valve clack and cover body bottom makes the extrusion amount of boss to sealing ring be accurately controlled, ensures that the pressure that sealing ring bears is always below its material yield strength, avoids the problem of extrusion excessively from the structural level.

Description

Technical Field

[0001] This utility model relates to the field of air valve technology, specifically to a high-pressure air valve. Background Technology

[0002] As water conveyance projects develop towards longer distances and higher lifts, pipeline design pressures continue to rise, and high-pressure water conveyance systems with a pressure rating of PN100 or higher have become common in water conservancy projects. These systems place stringent requirements on the pressure resistance of key components, and the limitations of traditional air valves under high-pressure conditions are becoming increasingly apparent, with the deformation of sealing rings being a particularly prominent issue.

[0003] Traditional air valves typically employ a single rubber sealing ring that mates with the valve disc, relying on the elastic compression of the sealing ring to form a sealing surface. However, in high-pressure environments of PN100 and above, the pressure per unit area on the sealing ring increases significantly. On one hand, excessive pressure can cause the sealing ring to be over-compressed, exceeding its material elastic limit and leading to permanent deformation, resulting in decreased sealing surface fit accuracy. On the other hand, the impact of high-pressure water flow can cause high-frequency vibrations at the contact interface between the sealing ring and the valve disc, which, over time, can easily cause edge wear and bulging of the sealing ring, compromising the seal integrity.

[0004] The related technology discloses a composite air release valve with a buffer structure to prevent water hammer. This composite air release valve abandons the conventional method of installing it below the valve body and reducing water flow through a small orifice. Instead, it installs the buffer valve body above the valve body and increases the pressure inside the valve body to prevent water hammer. Specifically, when the pipeline medium velocity increases, the buffer plate in the buffer valve cavity senses the air velocity and promptly moves upward to close the large buffer valve port at the top of the buffer valve cavity. High-speed air can only be discharged through the throttling orifice opened on the buffer plate, limiting the air discharge speed in the pipeline and increasing the pressure inside the valve body. This limits the speed at which the medium flows into the air release valve when the air is completely discharged, allowing the water to flow slowly into the air release valve, thus preventing water hammer caused by the high-speed impact of the medium on the float.

[0005] In the aforementioned prior art, the sealing ring is convexly mounted on the valve seat surface and directly abuts against the spherical surface of the float. With this design, when the system pressure is too high, the sealing ring will be excessively compressed, easily exceeding the elastic limit of its material, leading to permanent deformation, shortening its service life, and requiring frequent replacement. Utility Model Content

[0006] In view of the defects of the prior art, such as the increased wear of the sealing ring, the purpose of this utility model is to provide a high-pressure air valve that enhances the sealing performance between the valve disc and the sealing ring, and at the same time increases the service life of the sealing ring.

[0007] The technical solution provided by this utility model is as follows:

[0008] A high-pressure air valve includes a valve body, a protective sleeve, and a float.

[0009] The protective sleeve is fixed to the inner cavity of the valve body. The bottom of the protective sleeve is provided with a flow hole, and the upper peripheral wall is provided with several windows.

[0010] The float is located inside the casing, and the float can float or fall relative to the casing.

[0011] It also includes,

[0012] The upper cover assembly covers the valve body and seals with the valve body. The upper cover assembly includes a cover body, which has a first vent chamber and a sealing ring at the bottom of the cover body along the circumferential direction.

[0013] A valve disc assembly located above a float, the valve disc assembly including a valve disc having a boss on the valve disc for forming a sealing fit with a sealing ring;

[0014] When the valve disc is in close contact with the bottom of the cover, the first ventilation chamber is closed.

[0015] Furthermore, the sealing ring does not extend beyond the bottom surface of the cover; when the valve disc is in close contact with the bottom of the cover, it reduces the squeezing force of the boss on the sealing ring.

[0016] Furthermore, the cover includes,

[0017] Valve cover, which is sealed to the top of the valve body;

[0018] A valve seat mechanism is connected to the bottom of the valve cover, and the valve seat mechanism has a groove for accommodating a sealing ring, the bottom of the groove being open for a boss to pass through.

[0019] Furthermore, the valve seat mechanism includes,

[0020] The valve seat is sealed to the bottom of the valve cover, and the two together form a first venting chamber along the axial direction;

[0021] Valve seat pressure ring, wherein the valve seat pressure ring is disposed on the valve cover or valve seat;

[0022] The groove is located between the valve seat pressure ring and the valve seat.

[0023] Furthermore, the valve disc includes a valve disc body and an annular valve disc; the annular valve disc is circumferentially fixedly connected to the outer peripheral edge of the valve disc body;

[0024] The upper surface of the annular valve disc is a plane, which can tightly abut against the valve seat pressure ring and / or the bottom surface of the valve seat.

[0025] The boss protrusion is provided on the annular valve disc.

[0026] Furthermore, the bottom surface of the valve seat is flush with the bottom surface of the valve seat pressure ring.

[0027] Furthermore, the upper cover assembly also includes a guide rod slidably connected to the cover body, and the valve disc is fixedly connected to the lower end of the guide rod, and the two are coaxial;

[0028] The guide rod is used to drive the valve disc to move along its own axis.

[0029] Furthermore, the upper cover assembly also includes,

[0030] A buffer body, wherein the buffer body has a second vent chamber, the buffer body is connected to a valve cover, and the opening size of the second vent chamber is larger than the opening size of the first vent chamber;

[0031] A protective cover is located above the buffer body and is detachably connected to the valve cover.

[0032] Furthermore, it also includes,

[0033] A throttling plate is sleeved on the guide shaft and located in the second ventilation chamber, wherein the outer diameter of the throttling plate is smaller than the inner diameter of the opening of the second ventilation chamber;

[0034] An elastic element is sleeved on a guide shaft, with one end of the elastic element fixedly connected to a throttle plate and the other end fixedly connected to a protective cover, so that the throttle plate has a tendency to move toward the valve cover.

[0035] The guide shaft is fixedly connected to the cover, and the guide rod passes through the guide shaft.

[0036] Furthermore, in the direction away from the valve cover, the inner diameter of the opening of the second vent chamber gradually decreases at least partially.

[0037] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0038] (1) This utility model forms a mechanical limiting structure by the contact design between the valve disc and the bottom of the cover: when the two are in close contact, the amount of pressure exerted by the boss on the sealing ring is precisely controlled within the set range, which can effectively prevent the excessive upward force of the float or the excessive transmission of other external factors, ensuring that the pressure on the sealing ring is always lower than its material yield strength, thus avoiding the problem of excessive compression from a structural perspective.

[0039] (2) This utility model solves the problem of permanent deformation of the sealing ring due to excessive compression in the traditional structure, significantly extends the service life of the sealing element and reduces the frequency of maintenance and replacement; the extrusion amount is not affected by external working condition fluctuations, and is especially suitable for scenarios with strict requirements for sealing accuracy, such as high-pressure air systems; it retains the flexible sealing characteristics of the sealing ring, and achieves precise control of the sealing process through mechanical limit, which greatly improves the stability and durability of the overall structure under high pressure environment. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the first ventilation chamber in an embodiment of this application in its open state;

[0041] Figure 2 This is a schematic diagram of the first ventilation chamber in a closed state in one embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the valve disc assembly structure in one embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the valve seat mechanism structure in one embodiment of this application;

[0044] Figure 5 This is a schematic diagram of the sealing ring structure in one embodiment of this application;

[0045] Figure 6 This is a schematic diagram of the boss structure in one embodiment of this application.

[0046] Explanation of the labels in the diagram:

[0047] Valve body 1;

[0048] Casing 2; Window 21;

[0049] Float 3; Slide rod 31; Sealing gasket 32;

[0050] Cover 41, guide shaft 42, sealing ring 43, buffer body 44, protective cover 45; valve cover 411, valve seat pressure ring 412, valve seat 413;

[0051] Guide rod 51, valve disc 52, boss 53, vent 54; valve disc body 521, annular valve disc 522;

[0052] Throttling plate 61, elastic element 62. Detailed Implementation

[0053] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0054] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0055] The air valve is located at a local high point in the water pipeline. Under high pressure, there is a significant pressure difference between the inside and outside of the valve body. The sealing ring needs to form an absolutely sealed interface through the dynamic cooperation between the valve disc and the cover. When the valve disc is pushed upward by the float, the sealing ring cooperates with the annular valve disc to prevent high-pressure water from leaking from the air valve.

[0056] In existing technologies, the direct compression between the valve disc and the sealing ring creates a continuous "rigid impact-forced deformation" effect on the sealing ring under high pressure conditions. This non-buffered contact is the core cause of excessive fatigue of the sealing ring.

[0057] When the float pushes the valve disc upward, the bottom of the valve disc experiences an upward thrust, while the top makes a momentary rigid collision with the sealing ring. The impact force is directly transmitted to the elastic sealing ring through the metal valve disc. Especially under pressures of PN100 and above, this impact force can instantly reach the yield strength of the sealing ring material. Long-term, high-frequency opening and closing cycles will cause periodic stress alternation inside the sealing ring material, exceeding its fatigue limit.

[0058] This application discloses a high-pressure air valve, comprising a valve body 1, a protective sleeve 2, a float 3, a top cover assembly, a valve disc assembly, and a buffer assembly.

[0059] Among them, the valve body 1 provides a precise installation and positioning reference for internal components such as the casing 2, float 3, top cover assembly, and valve disc assembly, ensuring that the relative positions of each component meet the design requirements and guaranteeing the overall structural stability of the air valve.

[0060] The sleeve 2 is fixed to the inner cavity of the valve body 1, and the bottom of the sleeve 2 is provided with a flow hole as a water inlet channel. Several windows 21 are evenly distributed along the circumferential wall of the upper part of the sleeve 2. The number of windows 21 is preferably 6, and the shape is preferably rectangular. The spacing between adjacent windows 21 is equal.

[0061] It is worth noting that the number of windows 21 can be adjusted adaptively according to the actual gas-liquid flow ratio, for example, 7 or 8. The shape of the windows 21 can also be selected as circular or polygonal, etc., according to the operating conditions, as long as the gas flow requirements can be met.

[0062] As a dual-flow channel for gas and liquid, when the air valve is venting a large amount of gas, the upper gas can be quickly discharged through window 21 to prevent air blockage from affecting the stability of the flow rate; at the same time, under negative pressure conditions, external gas can be drawn in through window 21 to dynamically balance the pressure difference inside and outside the air valve and avoid structural fatigue caused by pressure fluctuations.

[0063] The float 3 is located inside the cavity of the protective sleeve 2 and can float or fall relative to the protective sleeve 2. The float 3 adopts a hollow sealed structure and is spherical in shape. Its outer diameter is slightly smaller than the inner cavity diameter of the protective sleeve 2, which ensures that it can float or fall smoothly along the axis of the protective sleeve 2, and can also limit radial sway through the guiding effect of the inner wall of the protective sleeve 2.

[0064] Since the float 3 is hollow, in order to further limit the rotation of the float 3 during the rising or falling process, a sliding rod 31 is provided at the bottom of the float 3. The sliding rod 31 passes through the flow hole at the bottom of the protective sleeve 2 and forms a sliding fit with the flow hole to provide stable guidance for the rising or falling of the float 3 and effectively constrain its rotation trend.

[0065] It is worth noting that the flow hole effectively restricts the rotation of the slide bar 31, allowing the slide bar 31 and float 3 to move only vertically and preventing them from rotating around their own axis. This restriction can be achieved by using specific cross-sectional shapes, such as square, polygonal, or other non-circular structures, or by using mechanical limiting structures such as slots.

[0066] The upper cover assembly covers the opening of the valve body 1 and is sealed to the valve body 1. The upper cover assembly includes a cover body 41, a first vent chamber is provided in the middle of the cover body 41 along the axial direction, and a sealing ring 43 is provided in the bottom of the cover body 41 along the circumferential direction. The sealing ring 43 does not extend beyond the bottom surface of the cover body 41.

[0067] The valve assembly is located directly above the float 3. The valve assembly includes a valve disc 52, on which a boss 53 is provided for forming a sealing fit with the sealing ring 43.

[0068] In order to accurately guide the movement of the valve disc 52, a guide shaft 42 fixedly connected to the cover body 41 is added to the upper cover assembly. The guide shaft 42 is vertically arranged above the cover body 41.

[0069] Accordingly, the structure of the valve disc assembly has also been adapted, with the addition of a guide rod 51 that slides through the guide shaft 42. The valve disc 52 is fixedly installed at the lower end of the guide rod 51, forming an integrated linkage structure. When the guide rod 51 moves along its own axis, it can directly drive the valve disc 52 to move synchronously. Through the cooperation between the guide shaft 42 and the guide rod 51, precise control of the movement trajectory of the valve disc 52 is achieved, effectively ensuring the stability and accuracy of the valve disc 52 during the opening and closing process.

[0070] When the float 3 floats upward under buoyancy, its top pushes the valve disc assembly upward as a whole. As the guide rod 51 slides upward along the guide shaft 42, the valve disc 52 gradually approaches the bottom of the cover 41 until the two are tightly abutted. During this process, the boss 53 on the valve disc 52 simultaneously embeds into the sealing ring 43. Through the squeezing action between the boss 53 and the sealing ring 43, the sealing ring 43 undergoes elastic deformation and forms a tight fit with the outer surface of the boss 53, thereby achieving a double sealing fit. At this time, the first vent chamber is closed.

[0071] More specifically, the cover 41 includes a valve cover 411 and a valve seat mechanism. The valve cover 411 is sealed to the top of the valve body 1, and the valve seat mechanism is connected to the bottom of the valve cover 411. The valve seat mechanism has a groove for accommodating the sealing ring 43, and the bottom of the groove is open for the boss 53 to pass through.

[0072] The valve seat mechanism includes a valve seat pressure ring 412 and a valve seat 413. The valve seat 413 is sealed and connected to the bottom of the valve cover 411. The valve seat pressure ring 412 is connected to the valve cover 411 or the valve seat 413. A groove is provided between the valve seat pressure ring 412 and the valve seat 413.

[0073] The valve disc 52 includes a valve disc body 521 and an annular valve disc 522. The annular valve disc 522 is circumferentially fixed to the edge of the valve disc body 521 and located on the outer periphery of the valve disc body 521. The valve disc body 521 has an upwardly convex spherical structure, and the upper surface of the annular valve disc 522 is a horizontal plane, which can tightly abut against the bottom surface of the valve seat pressure ring 412 and / or the valve seat 413. A boss 53 is protruding from the upper surface of the annular valve disc 522.

[0074] The vent holes formed axially in the middle of the valve cover 411 and the valve seat 413 have approximately the same inner diameter, together forming the first vent chamber. The valve seat 413 is L-shaped, and its bottom surface is flush with the bottom surface of the valve seat pressure ring 412.

[0075] The sealing ring 43 is preferably an O-ring, meaning its cross-section is O-shaped. This design can significantly extend the life of the annular sealing ring 43. The key reasons are: firstly, the contact surfaces between the upper surface of the annular valve disc 522 and the bottom surface of the valve seat pressure ring 412 and valve seat 413 are precision machined, resulting in high surface smoothness; secondly, the force exerted by the boss 53 on the sealing ring 43 is controllable. The structural design ensures that the compression amount is within the optimal elastic deformation range of the O-ring, guaranteeing both sealing performance and preventing permanent deformation or fatigue damage to the sealing ring due to excessive compression.

[0076] More specifically, the abutting design between the valve disc 52 and the bottom of the cover 41 is a crucial guarantee that the sealing ring 43 will not reach its yield strength. When the two are tightly abutting, a rigid limiting structure is formed, strictly restricting further displacement of the valve disc 52 relative to the cover 41. This ensures that the amount of pressure exerted by the boss 53 on the sealing ring 43 is precisely controlled within the set range, preventing excessive pressure due to excessive upward force of the float 3 or other external factors.

[0077] Because the extrusion amount is stable and within the elastic deformation range of the sealing ring 43 material, the stress generated inside it is always lower than the yield strength of the material. This avoids the sealing ring 43 from undergoing plastic deformation due to stress exceeding the yield strength, ensuring that the sealing ring 43 can maintain good elasticity and sealing performance for a long time, and further extending its service life.

[0078] The top cover assembly also includes a buffer body 44 and a protective cover 45. The protective cover 45 is located above the buffer body 44, and the protective cover 45 and the valve cover 411 are preferably detachably connected by a bolt assembly.

[0079] The buffer body 44 is fixedly connected to the surface of the valve cover 411. The buffer body 44 is roughly conical and hollow. The inner diameter of the opening on its top surface is smaller than the inner diameter of the opening on its bottom surface. A second venting chamber is opened along its axial direction. The opening size of the second venting chamber is larger than the opening size of the first venting chamber.

[0080] The high-pressure air valve of this application also includes a buffer assembly, which specifically includes a throttle plate 61 and an elastic element 62. The throttle plate 61 is sleeved on the outer wall of the guide shaft 42 and located in the second chamber 44. The outer diameter of the throttle plate 61 is smaller than the inner diameter of the opening of the second vent chamber.

[0081] The elastic element 62 is sleeved on the outer wall of the guide shaft 42, and one end of the elastic element 62 is fixedly connected to the throttle plate 61, and the other end is fixedly connected to the protective cover 45.

[0082] Because the elastic element 62 is in a pre-compressed state, after it is fixedly connected with the throttle plate 61, it can always apply a continuous thrust to the throttle plate 61, so that the throttle plate 61 and the valve cover 411 maintain a stable contact state. The core function of the elastic element 62 is to drive the throttle plate 61 to move vertically along the outer wall of the guide shaft 42, providing power support for the movement of the throttle plate 61.

[0083] Among them, the elastic element can be a metal elastic element, such as a coil spring or a leaf spring, or it can be a non-metallic elastic element, such as a rubber spring or a gas spring.

[0084] It is worth noting that the elastic element 62 is preferably a spring, whose extension and contraction characteristics along the axial direction of the guide shaft 42 can strictly constrain the movement trajectory of the throttle plate 61, ensuring that it always moves in a straight line along the guide shaft 42 without deviating or detaching.

[0085] More specifically, during the large-volume exhaust phase, the gas pressure accumulated inside the valve body 1 will concentrate on the lower surface of the throttle plate 61, forming an upward thrust. When this thrust overcomes the preload of the spring, the spring will undergo compression deformation from bottom to top along the outer wall of the guide shaft 42, and simultaneously drive the throttle plate 61 to translate upward along the axis of the guide shaft 42.

[0086] Because the buffer body 44 adopts a conical structure design, its outer diameter gradually decreases from bottom to top. Therefore, as the throttle plate 61 moves upward, the annular gap formed between the throttle plate 61 and the buffer body 44 will continuously shrink due to the change in their relative positions. That is, the radial distance between the outer ring of the throttle plate 61 and the inner wall of the buffer body 44 gradually shortens, thereby reducing the cross-sectional area of ​​gas flow in the second ventilation chamber, thus realizing dynamic throttling regulation of the exhaust process.

[0087] After a large amount of venting is completed, the water level inside valve body 1 rises, and float ball 3 rises synchronously due to buoyancy. During the upward movement of float ball 3, its top continuously contacts the bottom of valve disc 52 and applies an upward thrust, pushing the entire valve disc assembly upward along guide shaft 42. During this process, guide rod 51 slides stably along the inner wall of guide shaft 42, and valve disc 52 moves upward and gradually approaches the bottom of cover body 41. When the buoyancy of float ball 3 is sufficient to make valve disc 52 tightly abut against the bottom of cover body 41, boss 53 is embedded in sealing ring 43, and the sealing ring 43 undergoes elastic deformation through compression, forming a sealing fit, and the first vent chamber is closed.

[0088] One type of high-pressure air valve in this application is further provided with a micro-ventilation channel, which is opened only if the first ventilation chamber is closed. The guide rod 51 is provided with a vent hole 54, and the top of the float 3 is provided with a sealing gasket 32, which is used to open and close the micro-ventilation channel.

[0089] More specifically, the vent 54 includes a first vent at the bottom of the guide rod 51 and several second vents on the side wall of the guide rod 51. When the sealing gasket 31 abuts against the first vent at the bottom of the guide rod 61, the micro-venting channel is closed; when the sealing gasket 31 separates from the first vent at the bottom of the guide rod 51, the vent 54 communicates with the outside, and the micro-venting channel is opened.

[0090] The opening and closing of the above-mentioned micro-venting channel is specifically applied under normal pipeline operating conditions: When the external water pipeline is operating normally, the dissolved gas in the fluid inside the pipeline continuously precipitates and gradually accumulates inside the valve body 1. As the amount of gas increases, the pressure of the gas medium in the valve body 1 gradually rises and exceeds the external atmospheric pressure. Under the action of the pressure difference, the valve disc 52 is subjected to an upward thrust, keeping the first venting chamber closed.

[0091] At the same time, such as Figure 5 As shown, the water level in the valve body 1 drops as the gas medium accumulates, and the float 3 loses its buoyancy support and falls synchronously with the water level. This causes the sealing gasket 32 ​​at the top of the float 3 to separate from the bottom of the guide rod 51, which opens the micro-venting channel formed by the vent hole 54 at the bottom of the guide rod 51. The accumulated gas is slowly discharged through this micro-venting channel to maintain the pressure stability in the pipeline.

[0092] As the micro-ventilation continues, the amount of gas accumulated inside valve body 1 gradually decreases, and the gas medium pressure decreases accordingly, gradually approaching the external atmospheric pressure. At this time, the upward thrust on valve disc 52 weakens, but it can still maintain the state where the first venting chamber is closed.

[0093] Meanwhile, as the gas is discharged, the water level inside valve body 1 gradually rises due to the replenishment of fluid in the pipeline. Under the influence of buoyancy, float 3 moves upward synchronously with the water level, and the sealing gasket 32 ​​at its top gradually approaches the bottom of guide rod 51. When the amount of gas inside valve body 1 decreases to a certain level, and the medium pressure reaches equilibrium with the external atmospheric pressure, float 3 rises to a position where the sealing gasket 32 ​​re-abuts the bottom of guide rod 51, sealing the vent 54 and closing the micro-venting channel, thus ending this micro-venting process. The cycle will restart when the gas accumulates to a certain amount.

[0094] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A high-pressure air valve, characterized in that: include, Valve body (1); The protective sleeve (2) is fixed in the inner cavity of the valve body (1). The bottom of the protective sleeve (2) is provided with a flow hole, and the upper peripheral wall is provided with several windows (21). A float (3) is located in the inner cavity of the protective sleeve (2), and the float (3) is able to float or fall relative to the protective sleeve (2); The upper cover assembly covers the valve body (1) and seals with the valve body (1). The upper cover assembly includes a cover body (41), which has a first ventilation chamber and a sealing ring (43) at the bottom of the cover body (41) along the circumferential direction. A valve assembly located above a float (3) includes a valve disc (52) having a boss (53) for forming a sealing fit with a sealing ring (43). When the valve disc (52) comes into close contact with the bottom of the cover (41), the first ventilation chamber is closed.

2. A high-pressure air valve according to claim 1, characterized in that: The sealing ring (43) does not extend beyond the bottom surface of the cover (41); when the valve disc (52) is in close contact with the bottom of the cover (41), it is used to reduce the squeezing force of the boss (53) on the sealing ring (43).

3. A high-pressure air valve according to claim 1, characterized in that: The cover (41) includes, Valve cover (411), which is sealed to the top of valve body (1); The valve seat mechanism is connected to the bottom of the valve cover (411) and has a groove for accommodating the sealing ring (43). The bottom of the groove is open for the boss (53) to pass through.

4. A high-pressure air valve according to claim 3, characterized in that: The valve seat mechanism includes, Valve seat (413), the valve seat (413) is sealed and connected to the bottom of the valve cover (411), and the two together form a first venting chamber along the axial direction; Valve seat pressure ring (412), the valve seat pressure ring (412) is disposed on the valve cover (411) or valve seat (413); The groove is located between the valve seat pressure ring (412) and the valve seat (413).

5. A high-pressure air valve according to claim 4, characterized in that: The valve disc (52) includes a valve disc body (521) and an annular valve disc (522); the annular valve disc (522) is circumferentially fixedly connected to the outer peripheral edge of the valve disc body (521); The upper surface of the annular valve disc (522) is a plane, which can closely abut against the bottom surface of the valve seat pressure ring (412) and / or the valve seat (413). The boss (53) is raised on the annular valve disc (522).

6. A high-pressure air valve according to claim 5, characterized in that: The bottom surface of the valve seat (413) is flush with the bottom surface of the valve seat pressure ring (412).

7. A high-pressure air valve according to claim 1, characterized in that: The upper cover assembly also includes a guide rod (51) that is slidably connected to the cover body (41), and the valve disc (52) is fixedly connected to the lower end of the guide rod (51), and the two are coaxial; The guide rod (51) is used to drive the valve disc (52) to move along its own axis.

8. A high-pressure air valve according to claim 7, characterized in that: The upper cover assembly also includes, A buffer body (44) is provided with a second venting chamber. The buffer body (44) is connected to a valve cover (411), and the opening size of the second venting chamber is larger than the opening size of the first venting chamber. A protective cover (45) is located above the buffer body (44) and is detachably connected to the valve cover (411).

9. A high-pressure air valve according to claim 8, characterized in that: It also includes, Throttling plate (61), the throttling plate (61) is sleeved on the guide shaft (42) and located in the second ventilation chamber, the outer diameter of the throttling plate (61) is smaller than the inner diameter of the opening of the second ventilation chamber; An elastic element (62) is sleeved on a guide shaft (42), and one end of the elastic element (62) is fixedly connected to a throttle plate (61) and the other end is fixedly connected to a protective cover (45) so that the throttle plate (61) has a tendency to move toward the valve cover (411). The guide shaft (42) is fixedly connected to the cover (41), and the guide rod (51) passes through the guide shaft (42).

10. A high-pressure air valve according to claim 9, characterized in that: In the direction away from the valve cover (411), the inner diameter of the opening of the second vent chamber gradually decreases at least partially.

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