A pressure retaining check valve and method of use

Abstract

The application discloses a kind of pressure maintaining check valves and its use method, belong to fluid pressure control valve technical field.The valve includes shell, protective end cap, filter core, adjusting piece, valve core, spring, sealing element and multiple sealing rings.The shell interior is equipped with the ring that has stepped hole and annular boss, and the inner cavity is divided into left and right cavity body;Filter core is located in stepped hole;Adjusting piece is screwed in right cavity body;Valve core is slidably arranged in adjusting piece, and its side wall is provided with radial hole;Sealing element is arranged at the left end of valve core;Spring is sleeved on valve core and abuts valve core and adjusting piece;Second, third sealing ring is arranged on the outer periphery of shell.The application realizes double or even triple waterproof sealing through multiple sealing rings;Rotary adjusting piece can steplessly adjust spring pre-tightening force, realize adjustable opening pressure;Filter core filters impurities to avoid jamming;Utilize equipment internal air pressure to assist sealing element, realize the self-reinforcing pressure of higher pressure better sealing.

Description

Technical Field

[0001] This invention relates to the field of fluid pressure control valve technology, and more specifically, to a pressure-holding check valve and its usage method. Background Technology

[0002] In underwater equipment, deep-sea exploration instruments, submarine compartments, and various sealed pressure vessels requiring internal inflation and pressure maintenance, control valves are typically required. These valves enable external inflation while preventing backflow of internal gas and the intrusion of external water. These valves are crucial components for maintaining stable internal pressure and preventing water leakage that could damage internal components.

[0003] In the prior art, for example, patent CN207394044U discloses a one-way valve, which includes an inflation valve seat, a sealing nozzle, a spring, and a nut. This valve is inflated by the inflation nozzle opening the sealing nozzle, and after inflation stops, the spring force causes the sealing nozzle to return to its original position and seal. However, in practical applications, especially in complex environments with deep water, high pressure, and variable operating conditions, this type of existing one-way valve exhibits the following significant defects and problems: Firstly, regarding sealing reliability, the sealing structures of the aforementioned patents and similar valves commonly found on the market are relatively simple. For example, CN207394044U mainly relies on gaskets to achieve static sealing, lacking multiple waterproof designs for dynamic operating conditions and multi-directional water pressure impacts. In deep-water, high-pressure environments, once a single sealing ring ages or is damaged, water can easily leak or even backflow into the equipment, causing catastrophic consequences and failing to meet the requirements for long-term, high-reliability underwater operation.

[0004] Secondly, regarding adaptability to operating conditions, the opening pressure of traditional valves is fixed by the preload of the internal spring, and users cannot adjust it on-site according to actual needs. This means that a valve can only be used for a specific pressure condition. If the equipment needs to work in water at different depths, or if the internal pressure holding requirements change, the valve will not be universal, greatly limiting its application range.

[0005] Secondly, regarding anti-pollution capabilities, the air intake channel of existing valves is completely open, without any filtration device. In actual operation, the external air source or surrounding water environment inevitably contains minute impurities such as dust, silt, and rust. After these impurities enter the valve body with the airflow, they can easily become stuck in the sliding gap between the valve core and the valve seat, causing the valve core to move inflexibly or become completely jammed. At the same time, impurities may also scratch the delicate sealing surface, causing permanent seal failure.

[0006] Furthermore, in terms of high-pressure holding performance, traditional valves rely solely on spring force to press the seal against the valve seat when closed. This structure is prone to internal leakage and has poor pressure holding performance.

[0007] Therefore, in view of the technical problems existing in the technology, such as few sealing layers, low reliability, non-adjustable opening pressure, susceptibility to impurity contamination, poor high pressure holding performance and lack of external protection, there is an urgent need to develop a new type of pressure-holding one-way valve that integrates multiple seals, adjustable pressure, air intake filtration, self-reinforcing pressure holding and complete protection. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pressure-holding check valve and its usage method that is compact in structure, reliable in sealing, adjustable in pressure, highly adaptable, and capable of stable operation in complex underwater environments for a long time. This solves the technical problems of existing valves, such as low sealing reliability, non-adjustable pressure, easy damage, high pressure differential, and weak environmental adaptability.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a pressure-holding one-way valve, comprising: The outer casing contains a spacer ring that divides the inner cavity of the casing into a left and a right cavity. This spacer ring provides clear fluid channels and functional zones for air intake, filtration, sealing, and pressure regulation, resulting in a compact valve structure and high functional integration. The spacer ring has stepped through-holes connecting the left and right cavities, comprising a first section and a second section. This stepped through-hole design facilitates filter element installation and positioning, and the variable diameter structure creates a throttling effect, optimizing the airflow path. An annular boss is located on the right end face of the spacer ring, at the outlet edge of the second section. This annular boss, as a precision-machined main sealing surface, works with the sealing element to achieve a high-precision narrow-face contact seal, significantly improving the sealing pressure and ensuring absolute sealing in the closed state.

[0010] A protective end cap, detachably mounted on the left end of the housing, is used to seal the port of the left cavity. When not inflated, the protective end cap provides the outermost layer of physical protection for the valve, effectively preventing external silt, biological deposits, and other contaminants from eroding and clogging internal components. It also prevents damage from accidental impacts, greatly enhancing the valve's survivability and service life in complex underwater environments. Its detachable design also provides a convenient interface for inflation operations.

[0011] The filter element is installed within the first orifice of the spacer ring. Positioned at the very front of the air intake channel, the filter element effectively intercepts and filters various solid impurity particles before the gas enters the valve body. This structure fundamentally prevents impurities from entering the sliding contact surface between the valve core and the regulating component, as well as the sealing pair, thus preventing valve core jamming and scratches on the sealing surface, significantly extending the valve's service life and operational reliability.

[0012] The adjusting component has external threads on its outer circumferential surface and screws into the right cavity of the housing; the adjusting component has an axial through hole inside. Through the threaded engagement structure, the adjusting component can achieve precise axial position adjustment within the right cavity, thereby changing the pre-compression of the associated spring and achieving stepless adjustment of the valve opening pressure. This allows the same valve to adapt to various operating conditions with different pressure requirements, greatly improving the product's versatility and flexibility.

[0013] The valve core is axially slidably mounted within the axial through-hole of the adjusting component. The valve core has a central through-hole inside and radial holes on its sidewalls that communicate with the central through-hole. As the core moving component for valve opening and closing, the valve core's internal central through-hole and sidewall radial holes form an airflow channel. When the valve is opened, gas can enter the central through-hole from the outside of the valve core through the radial holes and then exit axially.

[0014] A sealing element, installed at the left end of the valve core, is used to seal against the annular boss when the valve is closed. The sealing element and the annular boss together form the main sealing pair of the valve. The sealing element is installed at the left end of the valve core and moves synchronously with the valve core, resulting in a simple and reliable structure.

[0015] A spring, fitted onto the valve core, with one end abutting against the valve core and the other end abutting against the adjusting element, provides a leftward preload force to the valve core. This preload force is the primary power source for valve closure. By adjusting the spring's compression, the required gas pressure threshold for valve opening can be precisely controlled.

[0016] The second and third sealing rings are both installed on the outer circumferential surface of the housing to form a double seal with the external equipment panel. Two independent sealing rings between the housing and the equipment panel constitute a redundant sealing system. Even if one sealing ring fails due to aging or damage, the other sealing ring can still ensure an effective seal, preventing external water from seeping into the equipment. This double-sealing design greatly improves the installation and sealing reliability of the valve in deep-water, high-pressure environments, and is crucial to ensuring the absolute waterproof safety of the equipment.

[0017] Preferably, the housing includes a flange and a connector integrally formed on the right end face of the flange. Multiple bolt holes are evenly distributed in a ring on the flange. The integrated design of the flange and connector ensures the overall strength and rigidity of the housing, while the bolt holes on the flange allow the valve to be securely mounted to the equipment panel with screws, ensuring reliable connection and easy disassembly. A groove and an annular groove are provided on the outer circumferential surface of the housing. The groove is located at the root position where the flange and connector intersect, and the annular groove is located on the outer circumferential surface of the connector. The second sealing ring is installed in the groove, and the third sealing ring is installed in the annular groove. Positioning the groove at the root position allows the second sealing ring to form an end-face seal when the flange is tightened; positioning the annular groove on the outer circumferential surface of the connector allows the third sealing ring to form a radial seal with the inner wall of the mounting hole. The two sealing methods complement each other, addressing pressure loads in different directions respectively, resulting in better sealing performance.

[0018] Preferably, the left half of the protective end cap is configured as an annular baffle, and the outer circumferential surface of the right half is provided with external threads. The annular baffle provides a large pressing surface and sealing surface. A first recessed platform is provided at the left port of the left cavity of the outer shell. The right half of the protective end cap is screwed into the left cavity of the outer shell, and the annular baffle of the protective end cap is accommodated in the first recessed platform. The design of the first recessed platform provides precise accommodation and positioning space for the annular baffle of the protective end cap, so that the end cap is flush with the end face of the outer shell after installation, which is both aesthetically pleasing and prevents accidental bumps. The threaded connection is reliable and can be repeatedly disassembled and assembled, facilitating frequent inflation operations. The pressure-holding one-way valve also includes a first sealing ring, which is disposed between the annular baffle and the first recessed platform. The first sealing ring is compressed when the protective end cap is tightened, forming a static seal, completely isolating the external water environment from the inside of the valve, constituting a third waterproof barrier, and further enhancing the overall waterproof and seepage-proof capability.

[0019] Preferably, the axial through-hole of the adjusting component is a two-step through-hole, including a left section and a right section. The stepped hole design provides a structural basis for different functional sections. The left section is a cylindrical hole for sliding engagement with the valve core. The precise sliding engagement between the cylindrical hole and the valve core ensures the directionality and straightness of the valve core's movement, reduces friction and uneven wear, and ensures sensitive and reliable valve opening and closing. The right section is a hexagonal through-hole for engaging with an Allen wrench to rotate the adjusting component. The hexagonal through-hole provides a standardized tool interface, allowing users to easily rotate the adjusting component from outside the valve to set the pressure using a common Allen wrench, making operation simple, effortless, and precise.

[0020] Preferably, the left end of the left orifice section is provided with a chamfer. This chamfer is used to avoid the radial hole on the valve core when the valve is open, thus preventing airflow blockage. Specifically, this chamfer provides an expanded space when the valve core is open and gas flows through the radial hole, preventing airflow blockage or additional flow resistance caused by the inner wall of the regulating element. This detailed design ensures that the valve's flow capacity is not affected even when the regulating element is screwed in deeply, ensuring charging efficiency.

[0021] Preferably, the outer cylindrical surface of the valve core is stepped, with the outer diameter of its left half being larger than that of its right half. The left half of the valve core slides in conjunction with the inner wall of the axial through hole of the adjusting component. The spring is sleeved on the right half of the valve core. The stepped design naturally forms an annular stepped surface for abutting the spring, eliminating the need for additional parts. Simultaneously, the larger diameter left half slides in conjunction with the adjusting component, providing sufficient guiding length and bearing area to ensure smooth movement; the smaller diameter right half is used to sleeve the spring, resulting in a compact structure.

[0022] Preferably, the central through-hole of the valve core is a two-step bore, including a mounting countersunk surface and an axial hole from left to right. The diameter of the mounting countersunk surface is larger than the diameter of the axial hole. The seal is housed within the mounting countersunk surface. The mounting countersunk surface provides a large-diameter accommodating space for placing the seal and can be secured by a subsequent retaining ring. The axial hole is the main channel for gas outflow. Embedding the seal within the mounting countersunk surface inside the valve core, rather than simply pasting it to the end face, allows for more precise positioning of the seal, making it less prone to displacement or detachment under high pressure, and resulting in higher connection reliability.

[0023] Preferably, the device further includes a retaining ring disposed at the opening of the mounting platform to axially limit the seal and prevent it from dislodging from the mounting platform. As a standard fastener, the retaining ring is easy to install and provides reliable axial limiting. When the valve core undergoes high-speed reset or is subjected to significant reverse pressure impact, the retaining ring firmly blocks the seal, ensuring it remains in the correct working position and guaranteeing the long-term effectiveness of the sealing function.

[0024] Preferably, a hexagonal countersunk hole is provided at the center of the left end face of the protective end cap for use with an Allen wrench to install and remove the protective end cap. Similar to the adjusting component, the use of an Allen wrench standardizes the tools, allowing users to use the same set of tools to install and remove the protective end cap and adjust the opening pressure, thus improving operational convenience.

[0025] Secondly, this invention proposes a method of using the aforementioned pressure-holding one-way valve, comprising the following steps: Adjustment steps: By rotating the adjusting component, the compression of the spring is changed to preset the valve opening pressure. This step allows users to flexibly and accurately set the valve opening threshold on-site according to the actual working pressure requirements of the equipment (such as the environmental pressure corresponding to different water depths), realizing the adaptation of a single valve to multiple working conditions.

[0026] Installation steps: Insert the housing into the mounting hole on the equipment panel, and form a double seal with the equipment panel through the second and third sealing rings. This step ensures the connection strength and waterproof sealing between the valve and the equipment, providing a reliable installation foundation for subsequent inflation and pressure holding operations.

[0027] Inflation steps: Remove the protective end cap, connect the external air source to the left cavity, and the gas flows through the filter element and the second hole section in sequence. When the air pressure overcomes the preload of the spring, it pushes the valve core to the right, causing the seal to disengage from the annular boss, the valve opens, and the gas enters the equipment through the radial hole and the central through hole of the valve core.

[0028] Self-sealing step: After inflation stops, the spring pushes the valve core to the left to reset until the sealing element abuts against the annular boss, closing the valve. The internal air pressure of the equipment acts on the sealing element, pressing it tightly against the annular boss, thus achieving a self-reinforcing seal. This step is one of the core inventive points of this invention. It cleverly transforms the high-pressure gas already filled into the equipment into sealing force, achieving a self-reinforcing effect of "the higher the pressure, the tighter the seal," completely solving the problem of traditional valves being prone to internal leakage under high pressure.

[0029] Protection procedure: After inflation, reattach the protective end cap to the left end of the outer casing to form external protection. This step restores the valve's physical and sealing protection after inflation, ensuring the valve can operate safely and reliably underwater for extended periods.

[0030] Compared with the prior art, the pressure-holding one-way valve and its usage method provided by the present invention have the following outstanding advantages: (1) The present invention provides a second sealing ring and a third sealing ring between the outer shell and the equipment panel to form two independent installation seals; at the same time, a first sealing ring is provided between the external protective end cap and the outer shell to form a third isolation seal from the external water environment. This triple sealing design provides layer-by-layer protection, ensuring the absolute waterproofness of the equipment and greatly improving the sealing reliability and safety in harsh environments such as deep water, high pressure, and pressure fluctuations.

[0031] (2) By rotating the adjusting component, users can easily change the pre-compression of the spring, thereby steplessly adjusting the valve opening pressure within a wide range according to actual working conditions. One valve can be used in various working scenarios with different depths and pressure requirements, greatly improving the product's versatility and flexibility, and reducing spare parts costs.

[0032] (3) A filter element is installed at the very front of the air intake channel, which can effectively intercept and filter various solid impurity particles in the air source. This fundamentally prevents impurities from entering the precision sliding mating surfaces and sealing pairs inside the valve body, prevents valve core jamming and sealing surface scratches, and significantly extends the service life and operational reliability of the valve.

[0033] (4) This invention cleverly utilizes the high-pressure gas inside the equipment to convert its pressure into positive pressure exerted by the sealing element on the valve seat. The higher the internal pressure, the tighter the sealing element is pressed, and the better the sealing effect. This unique self-sealing and self-reinforcing design completely changes the shortcomings of traditional one-way valves that are prone to leakage under high pressure. It has excellent pressure holding performance and is particularly suitable for sealed containers that need to maintain internal high pressure for a long time.

[0034] (5) All functional components (filtering, regulating, sealing, and resetting) are integrated into a single housing, resulting in a very compact structure and small footprint. The removable protective end caps provide reliable physical protection for the internal precision components, preventing the intrusion of external mud, sand, and biological deposits. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0036] Figure 1 This is a cross-sectional view of the pressure-holding check valve provided by the present invention.

[0037] Figure 2 This is a three-dimensional structural diagram of the outer shell in this invention.

[0038] Figure 3 This is a cross-sectional view of the outer casing in this invention.

[0039] Figure 4 This is a three-dimensional structural diagram of the valve core in this invention.

[0040] Figure 5 This is a cross-sectional view of the adjusting component in this invention.

[0041] Explanation of reference numerals: 1. First sealing ring; 2. Protective end cap; 2a. Hexagonal countersunk hole; 3. Housing; 3a. Flange; 3b. Insert pipe; 3c. Spacer ring; 3d. Left cavity; 3e. Right cavity; 3f. First hole section; 3g. Second hole section; 3h. Annular boss; 3i. First countersunk platform; 3j. Groove; 3k. Annular groove; 4. Second sealing ring; 5. Third sealing ring; 6. Adjusting element; 6a. Left hole section; 6b. Right hole section; 7. Spring; 8. Valve core; 8a. Radial hole; 8b. Mounting countersunk platform; 8c. Axial hole; 9. Seal; 10. Snap ring; 11. Filter element. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0044] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0045] Please also refer to Figures 1 to 5 This embodiment provides a pressure-holding one-way valve. This valve is mainly used in equipment that needs to be inflated and maintain internal pressure underwater, such as pressure compensation devices for deep-sea probes, buoyancy adjustment systems for underwater robots, or equipment compartments of submersibles.

[0046] The pressure-holding one-way valve specifically includes the following components: first sealing ring 1, protective end cap 2, outer shell 3, second sealing ring 4, third sealing ring 5, adjusting element 6, spring 7, valve core 8, sealing element 9, retaining ring 10, and filter element 11.

[0047] The detailed structure and connection relationships of each component are as follows: 1. Outer shell 3: like Figure 2 and Figure 3 As shown, the outer casing 3 is the base of the valve. It is integrally formed from a circular flange 3a and a plug pipe 3b extending vertically from the center of the right end face of the flange 3a. Multiple bolt holes (four in this embodiment) are evenly machined on the flange 3a for fixing the entire valve to the mounting panel of the equipment with screws.

[0048] Inside the center of the outer casing 3, there is a one-piece spacer ring 3c. This spacer ring 3c clearly divides the hollow cavity inside the outer casing 3 into two parts: the left cavity 3d on the left and the right cavity 3e on the right. For connection with other components, internal threads are machined on the inner walls of both the left cavity 3d and the right cavity 3e.

[0049] The center of the spacer ring 3c is not a simple through hole, but a stepped through hole, consisting of a larger diameter first section 3f and a smaller diameter second section 3g from left to right. The function of the first section 3f is to accommodate and position the filter element 11. On the right end face of the spacer ring 3c, around the outlet edge of the second section 3g, a slightly raised annular boss 3h is precisely machined. This annular boss 3h is one of the most critical main sealing surfaces of the valve.

[0050] At the left opening end of the left cavity 3d, i.e., at the port position, a recessed first countersunk 3i is machined. This first countersunk 3i is used to accommodate the annular baffle portion of the protective end cap 2. Furthermore, there are two important sealing structures on the outer surface of the housing 3: one is an annular groove 3j machined at the root of the connection between the flange 3a and the connector 3b; the other is an annular groove 3k machined on the outer cylindrical surface of the connector 3b. The groove 3j is used to install the second sealing ring 4, and the annular groove 3k is used to install the third sealing ring 5.

[0051] II. Protective end cap 2: like Figure 1 As shown, the protective end cap 2 is a cover with protective and sealing functions. Its left half is an annular baffle with a larger diameter, and its right half is a cylindrical section with a slightly smaller outer diameter and external threads. The protective end cap 2 is screwed together with the internal threads of the left cavity 3d of the outer casing 3 through the external threads of its right half. When tightened, the annular baffle of its left half is completely embedded in the first recess 3i of the outer casing 3. To increase the seal, a first sealing ring 1 is installed between the right side of the annular baffle and the bottom surface of the first recess 3i. To facilitate disassembly and assembly using a standard Allen wrench, a hexagonal countersunk hole 2a in the shape of an internal hexagon is machined at the center of the left end face of the protective end cap 2.

[0052] III. Filter Element 11: Filter element 11 is a porous filter element whose dimensions match the first pore section 3f on the spacer ring 3c. It is press-fitted into the first pore section 3f to filter all the filling gas entering the valve.

[0053] IV. Second sealing ring 4 and third sealing ring 5: Both the second sealing ring 4 and the third sealing ring 5 are standard O-ring rubber seals. The second sealing ring 4 is installed in the groove 3j of the housing 3. When the flange 3a is attached to the equipment panel and tightened by screws, the sealing ring is squeezed and deformed, achieving the first end face seal.

[0054] The third sealing ring 5 is installed in the annular groove 3k of the housing 3. When the insertion pipe 3b is inserted into the mounting hole of the equipment panel, the sealing ring is in close contact with the inner wall of the mounting hole, thus achieving a second radial seal.

[0055] V. Adjusting component 6: like Figure 5 As shown, the adjusting component 6 is a cylindrical part with external threads. Its external threads mate with the internal threads of the right cavity 3e of the outer casing 3. The interior of the adjusting component 6 is not a straight through hole, but rather machined into a two-step through hole, including a left section 6a on the left and a right section 6b on the right. The left section 6a is a smooth cylindrical hole with a diameter slightly larger than the outer diameter of the left half of the valve core 8, forming a sliding fit surface. The right section 6b is a hexagonal through hole, its size adapted to a standard Allen wrench. A chamfer 6c is machined at the leftmost opening of the left section 6a. The structural design requires that when the valve core 8 is in the open state, the adjusting component 6 must not block the radial hole 8a.

[0056] VI. Valve Core 8: Combination Figure 1 , Figure 4 As shown, the valve core 8 is the moving core component inside the valve. Its outer contour is a stepped shaft shape, meaning the diameter of the left half is larger than the diameter of the right half. The larger diameter left half slides into the left hole section 6a of the adjusting member 6. The interior of the valve core 8 is machined into a two-step central hole, including a mounting countersunk 8b on the left and an axial hole 8c on the right. The diameter of the mounting countersunk 8b is larger than that of the axial hole 8c. Multiple radial holes 8a (two in this embodiment, evenly distributed circumferentially) are drilled on the sidewall of the valve core 8. These radial holes 8a connect the outer cylindrical surface of the valve core 8 to the internal axial hole 8c. The mounting countersunk 8b is used to accommodate the seal 9, which is a gasket made of wear-resistant materials such as polyurethane or fluororubber. To prevent the seal 9 from falling off, a retaining ring 10 is installed at the opening of the mounting countersunk 8b. The retaining ring 10 is engaged in the annular groove on the inner wall of the valve core 8 to axially limit the seal 9.

[0057] VII. Spring 7: Spring 7 is a helical compression spring. It is fitted onto the right half (the smaller diameter section) of valve core 8. The left end of spring 7 abuts against the annular step surface formed at the junction of the left and right halves of valve core 8, and the right end of spring 7 abuts against the step surface inside adjusting member 6 (i.e., the step surface between left hole section 6a and right hole section 6b).

[0058] VIII. Valve Working Process and Principle Pressure Adjustment: Before assembling the one-way valve onto the equipment panel, the user inserts an Allen wrench into the hexagonal hole (right hole section 6b) on the right end of the adjusting component 6, according to the required working pressure of the equipment, and rotates the adjusting component 6. Since the adjusting component 6 is threadedly connected to the housing 3, rotating the adjusting component 6 will cause it to move to the left or right within the right cavity 3e. If the adjusting component 6 is turned to the left, the spring 7 is further compressed, increasing the spring force, which means that a higher intake pressure is required to push open the valve core 8, i.e., the pressure adjustment is activated. Conversely, if the adjusting component 6 is turned to the right, the compression of the spring 7 decreases, activating the pressure adjustment.

[0059] Initial closed state: such as Figure 1 As shown, inflation is not in progress at this time. Spring 7 is in a pre-compressed state, pushing valve core 8 to the left. Valve core 8 drives the seal 9 at its left end, pressing it tightly against the annular boss 3h on the spacer ring 3c of the outer casing 3. At this time, the left cavity 3d and the right cavity 3e are completely isolated, and the valve is in the closed state. At the same time, the protective end cap 2 is screwed onto the left end of the outer casing 3 and isolated from the external environment by the first sealing ring 1. The outer casing 3 achieves double sealing with the equipment panel through the second sealing ring 4 and the third sealing ring 5.

[0060] Inflation Open State: Before inflation, remove the protective end cap 2. Connect the external air source to the inlet of the left cavity 3d of the outer casing 3. High-pressure gas first passes through the left cavity 3d and the filter element 11, where impurities are captured. The filtered clean gas continues to the right, passing through the second hole section 3g of the spacer ring 3c, and finally acts on the left end face of the valve core 8 and the seal 9. When the rightward thrust generated by the gas pressure is greater than the leftward preload of the spring 7, the valve core 8 begins to move to the right against the spring force. The rightward movement of the valve core 8 causes the seal 9 to move away from the annular boss 3h, and the valve port is opened. The high-pressure gas then enters the right cavity 3e of the outer casing 3 and enters the axial hole 8c at its center through the radial hole 8a on the valve core 8. The chamfer 6c at the left end of the adjusting member 6 cleverly avoids the radial hole 8a, ensuring smooth gas flow. Finally, the gas flows out from the right hole section 6b of the adjusting member 6 and enters the equipment connected to the valve, completing the inflation.

[0061] Closure and Self-Reinforcing Pressure Holding: After inflation is complete, disconnect the external gas source. At this time, the gas pressure on the valve core 8 disappears, and the preload of the spring 7 takes over, quickly pushing the valve core 8 to move to the left to reset. The valve core 8 drives the seal 9 to contact the annular boss 3h again, and the valve port closes. At this time, the inside of the equipment is filled with high-pressure gas. This high-pressure gas fills the axial hole 8c of the valve core 8. This high-pressure gas acts on the right side of the seal 9. This pressure generates a leftward thrust, pressing the seal 9 more tightly onto the annular boss 3h. The higher the internal pressure, the greater this additional sealing force, thus achieving a self-reinforcing pressure holding effect of "the higher the pressure, the tighter the seal," greatly improving the sealing reliability of the valve under high pressure.

[0062] Final Protection: After the inflation operation is completed, screw the protective end cap 2, along with its first sealing ring 1, back into the left cavity 3d of the outer casing 3. Upon tightening, the first sealing ring 1 is compressed, forming the outermost seal. This protective end cap 2 effectively prevents external silt, microorganisms, seawater, etc., from directly eroding and contaminating the internal core moving parts and air inlet, ensuring the long-term reliability and service life of the valve in complex underwater environments.

[0063] Industrial applicability: The pressure-holding check valve and its usage method provided by this invention are compact in structure, highly integrated in function, have excellent sealing performance, and strong environmental adaptability. Its multiple sealing design, adjustable opening pressure, built-in filtration, and self-reinforcing pressure-holding characteristics make it perfectly suited for industrial fields with extremely high requirements for valve reliability, sealing, and adaptability, such as deep-sea exploration, underwater engineering, submersibles, pressure vessels, aerospace, and hydraulic / pneumatic systems. It possesses extremely high practical value and broad prospects for widespread application.

[0064] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A pressure-holding one-way valve, characterized in that, include: The outer shell (3) has a partition ring (3c) inside, which divides the inner cavity of the outer shell (3) into a left cavity (3d) and a right cavity (3e). The partition ring (3c) has a stepped through hole that connects the left cavity (3d) and the right cavity (3e). The stepped through hole includes a first hole segment (3f) and a second hole segment (3g). An annular boss (3h) is provided on the right end face of the partition ring (3c) at the outlet edge of the second hole segment (3g). A protective end cap (2) is detachably installed on the left end of the outer shell (3) to block the port of the left cavity (3d); The filter element (11) is installed in the first hole section (3f) of the spacer ring (3c); The adjusting member (6) has an external thread on its outer circumferential surface and is screwed into the right cavity (3e) of the outer shell (3); the adjusting member (6) has an axial through hole inside; The valve core (8) is axially slidably installed in the axial through hole of the adjusting member (6). The valve core (8) has a central through hole inside and a radial hole (8a) communicating with the central through hole on its side wall. A seal (9) is installed at the left end of the valve core (8) for sealing and abutting against the annular boss (3h) when the valve is closed; A spring (7) is sleeved on the valve core (8), with one end abutting the valve core (8) and the other end abutting the adjusting member (6), for providing a leftward preload force to the valve core (8); as well as The second sealing ring (4) and the third sealing ring (5) are both installed on the outer peripheral surface of the housing (3) to form a double seal with the external equipment panel.

2. The pressure-holding one-way valve according to claim 1, characterized in that, The outer casing (3) includes a flange (3a) and a connector (3b) integrally formed on the right end face of the flange (3a). The flange (3a) has a plurality of bolt holes evenly distributed in a ring. The outer circumferential surface of the outer casing (3) is provided with a groove (3j) and an annular groove (3k). The groove (3j) is located at the root position where the flange (3a) and the connector (3b) meet. The annular groove (3k) is located on the outer circumferential surface of the connector (3b). The second sealing ring (4) is installed in the groove (3j), and the third sealing ring (5) is installed in the annular groove (3k).

3. The pressure-holding one-way valve according to claim 1, characterized in that, The left half of the protective end cap (2) is configured as an annular baffle, and the outer circumferential surface of the right half is provided with external threads; the left port of the left cavity (3d) of the outer shell (3) is provided with a first recess (3i); the right half of the protective end cap (2) is screwed into the left cavity (3d) of the outer shell (3), and the annular baffle of the protective end cap (2) is accommodated in the first recess (3i); the pressure-holding one-way valve also includes a first sealing ring (1), which is disposed between the annular baffle and the first recess (3i).

4. The pressure-holding one-way valve according to claim 1, characterized in that, The axial through hole of the adjusting member (6) is a two-step through hole, including a left hole section (6a) and a right hole section (6b); the left hole section (6a) is a cylindrical hole for sliding fit with the valve core (8); the right hole section (6b) is a hexagonal through hole for fitting with an internal hex wrench to rotate the adjusting member (6).

5. The pressure-holding one-way valve according to claim 4, characterized in that, The left end of the left hole section (6a) is provided with a chamfer (6c), which is used to avoid the radial hole (8a) on the valve core (8) when the valve is opened, so as to avoid blocking the airflow.

6. The pressure-holding one-way valve according to claim 1, characterized in that, The outer cylindrical surface of the valve core (8) is stepped, and the outer diameter of its left half is larger than that of its right half; the left half of the valve core (8) slides in fit with the inner wall of the axial through hole of the adjusting member (6); the spring (7) is sleeved on the right half of the valve core (8).

7. The pressure-holding one-way valve according to claim 1, characterized in that, The central through hole of the valve core (8) is a two-step hole, which includes a mounting base (8b) and an axial hole (8c) from left to right. The diameter of the mounting base (8b) is larger than the diameter of the axial hole (8c). The seal (9) is housed in the mounting base (8b).

8. The pressure-holding one-way valve according to claim 7, characterized in that, It also includes a retaining ring (10), which is disposed at the opening of the mounting platform (8b) to axially limit the seal (9) and prevent it from coming out of the mounting platform (8b).

9. The pressure-holding one-way valve according to claim 1, characterized in that, A hexagonal countersunk hole (2a) is provided at the center of the left end face of the protective end cap (2) for use with an internal hex wrench to install or remove the protective end cap (2).

10. A method of using the pressure-holding one-way valve according to any one of claims 1-10, characterized in that, Includes the following steps: Adjustment steps: By rotating the adjusting member (6), the compression of the spring (7) is changed to preset the valve opening pressure; Installation steps: Insert the outer casing (3) into the mounting hole of the device panel, and form a double seal with the device panel through the second sealing ring (4) and the third sealing ring (5); Inflation steps: Remove the protective end cap (2), connect the external air source to the left cavity (3d), and the gas flows through the filter element (11) and the second hole section (3g) in sequence. When the air pressure overcomes the preload of the spring (7), it pushes the valve core (8) to the right, causing the seal (9) to disengage from the annular boss (3h), the valve opens, and the gas enters the equipment through the radial hole (8a) and the central through hole of the valve core (8). Self-sealing step: After the inflation stops, the spring (7) pushes the valve core (8) to move to the left and reset until the sealing element (9) abuts against the annular boss (3h), the valve is closed, and the internal air pressure of the equipment acts on the sealing element (9) to press the annular boss (3h) to achieve self-reinforcing sealing; Protection steps: After inflation is complete, the protective end cap (2) is reinstalled on the left end of the outer shell (3) to form external protection.

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