One-way valve with pressure regulation function

Abstract

The one-way valve with the pressure adjusting function comprises a valve body, a valve cavity, a first channel and a second channel are formed in the valve body, the first channel and the second channel communicate with the valve cavity, and an opening is formed between the valve cavity and the first channel; the valve element assembly comprises an adjusting sleeve, and the adjusting sleeve is constructed to be in threaded connection with the valve cavity; the valve element assembly further comprises a needle valve connected with the adjusting sleeve through an elastic device, and when the pressure of the working medium in the first channel is larger than a threshold value, the needle valve is pushed to overcome the elastic force of the elastic device to open the opening. And when the pressure is smaller than the threshold value, the needle valve is configured to seal the opening from the first channel to the valve cavity under the action of the elastic device. The one-way valve can achieve adjustability of opening pressure, can adapt to system pressure changes without replacing the whole one-way valve, and improves flexibility and economical efficiency of a system.

Description

Technical Field

[0001] This disclosure relates to the field of hydraulic equipment, and more specifically, to a one-way valve with pressure regulation. Background Technology

[0002] Check valves are one of the core components of industrial control systems. They are used in the system's return oil line or at the pump outlet as back pressure valves, generating a certain amount of return oil resistance to improve the smoothness of the actuator's movement. Traditional check valves have their opening pressure determined by a fixed elastic element at the factory, which cannot be adjusted once installed. Therefore, when system pressure demands change or operating conditions fluctuate, it is often necessary to replace the entire check valve or redesign the system, increasing costs and reducing efficiency.

[0003] Therefore, how to dynamically adjust the opening pressure of the check valve according to the actual working conditions, so as to flexibly adapt to changes in system pressure, reduce maintenance costs and improve operating efficiency, has become an urgent problem to be solved. Utility Model Content

[0004] This disclosure provides a one-way valve with pressure regulation to address the problems existing in the prior art.

[0005] According to a first aspect of this disclosure, a one-way valve with pressure regulation is provided, comprising:

[0006] The valve body has a valve cavity and a first channel and a second channel that are respectively connected to the valve cavity, and an opening is provided between the valve cavity and the first channel;

[0007] A valve core assembly, the valve core assembly including an adjusting sleeve configured to be threadedly connected to the valve cavity;

[0008] The valve core assembly also includes a needle valve connected to the adjusting sleeve via an elastic device. When the pressure of the working medium in the first channel is greater than a threshold, the needle valve is pushed to open the opening against the elastic force of the elastic device; and when the pressure is less than the threshold, the needle valve is configured to close the opening from the first channel to the valve cavity under the action of the elastic device.

[0009] In one embodiment of this disclosure, the needle valve includes a tapered sealing portion, which forms a line seal with the opening when the needle valve closes the opening, thereby preventing the working medium from flowing from the second channel to the first channel.

[0010] In one embodiment of this disclosure, the axis of the first channel is parallel to the axis of the second channel.

[0011] In one embodiment of this disclosure, the axis of the valve chamber is perpendicular to the axis of the first channel.

[0012] In one embodiment of this disclosure, the adjusting sleeve has a groove extending along the axial direction of the valve cavity, and the elastic device is disposed in the groove; the needle valve further includes an extension portion disposed at one end of the sealing portion away from the first channel and configured to at least partially extend into the groove; wherein the groove and the extension portion extend in the same direction.

[0013] In one embodiment of this disclosure, a plurality of throttling grooves are provided in the valve cavity at the position corresponding to the sealing part, arranged in a stepped manner; the inner diameter of the plurality of throttling grooves increases sequentially in the direction gradually moving away from the opening.

[0014] In one embodiment of this disclosure, a gasket is provided between the needle valve and the elastic device; one end of the elastic device abuts against the adjusting sleeve, and the other end abuts against the end of the needle valve away from the first channel via the gasket, and a preload is applied to the needle valve via the gasket.

[0015] In one embodiment of this disclosure, an annular sealing assembly is provided on the outer periphery of the adjusting sleeve, the annular sealing assembly being configured to be at least partially pre-pressed between the outer wall of the adjusting sleeve and the inner wall of the valve cavity.

[0016] In one embodiment of this disclosure, an annular stop is provided at the end of the valve cavity away from the first channel; the outer wall of the adjusting sleeve is provided with a recess that cooperates with the annular stop, and the outer diameter of the recess is smaller than the inner diameter of the annular stop.

[0017] In one embodiment of this disclosure, the adjusting sleeve is an internal hexagonal adjusting sleeve.

[0018] In one embodiment of this disclosure, the pressure-regulating check valve is a tubular check valve.

[0019] One beneficial effect of this disclosure is that the thread fit depth between the valve core assembly and the valve cavity can be changed by rotating the adjusting sleeve, thereby adjusting the pre-compression of the elastic device and thus changing the opening pressure threshold of the needle valve, enabling the check valve to adapt to different operating conditions. The pressure-regulating check valve of this disclosure achieves adjustable opening pressure, adapting to system pressure changes without replacing the entire check valve, thus improving system flexibility and economy.

[0020] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0022] Figure 1 This is a cross-sectional view of the valve body of the one-way valve with pressure regulation provided in an embodiment of this disclosure;

[0023] Figure 2 This is a cross-sectional view of the valve core assembly of a pressure-regulating check valve provided in an embodiment of this disclosure;

[0024] Figure 3 This is a cross-sectional view of a pressure-regulated check valve provided in an embodiment of this disclosure.

[0025] Figures 1 to 3 The correspondence between the component names and the reference numerals in the figures is as follows:

[0026] 1. Valve body; 10. Valve cavity; 11. First channel; 12. Second channel; 13. Opening; 14. Throttling groove; 15. Mating area; 2. Valve core assembly; 21. Adjusting sleeve; 211. Threaded area; 22. Elastic device; 23. Needle valve; 231. Sealing part; 232. Extension part; 24. Groove; 25. Gasket; 26. Annular sealing assembly; 261. O-ring; 262. Polymer four-ring; 27. Annular stop; 271. Recess; 3. Locking nut. Detailed Implementation

[0027] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless specifically stated otherwise, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0028] Numerous specific details are set forth in the following description to provide a full understanding of this disclosure. However, this disclosure can be implemented in many other ways than those described herein, and similar extensions can be made by those skilled in the art without departing from the spirit of this disclosure. Therefore, this disclosure is not limited to the specific implementations disclosed below. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0029] The terminology used in one or more embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of this disclosure. The singular forms “a,” “the,” and “the” as used in one or more embodiments of this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in one or more embodiments of this disclosure refers to and includes any or all possible combinations of one or more associated listed items.

[0030] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this disclosure, and similarly, second may also be referred to as first. Depending on the context, the word “if” as used herein may be interpreted as “when”, “in response to a determination”, or “upper”, “lower”, “front”, “back”, “left”, “right”, etc., are used only to indicate the relative positional relationship between related parts, and not to define the absolute position of these related parts. In this document, “equal”, “same”, etc., are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0031] This disclosure provides a pressure-regulated one-way valve, which includes at least: a valve body, a valve cavity disposed within the valve body, and a first channel and a second channel respectively communicating with the valve cavity, with an opening between the valve cavity and the first channel; a valve core assembly, the valve core assembly including an adjusting sleeve configured to be threadedly connected to the valve cavity; the valve core assembly further includes a needle valve connected to the adjusting sleeve via an elastic device, wherein when the pressure of the working medium in the first channel is greater than a threshold, the needle valve is pushed to open the opening against the elastic force of the elastic device; and when the pressure is less than the threshold, the needle valve is configured to close the opening from the first channel to the valve cavity under the action of the elastic device.

[0032] In its initial state, when the pressure of the working medium in the first channel is lower than a set threshold, the needle valve, under the elastic force of the elastic device, presses tightly against the valve cavity opening, sealing the connection between the first channel and the valve cavity and preventing the flow of the working medium. When the pressure in the first channel rises and exceeds the set threshold, the working medium pressure pushes the needle valve to overcome the elastic force of the elastic device, causing the needle valve to move away from the opening, allowing the working medium to flow into the valve cavity from the first channel and out through the second channel, achieving one-way flow. When the pressure drops below the threshold, the rebound force of the elastic device pushes the needle valve to reset, re-closing the opening and cutting off the backflow of the working medium, ensuring the one-way flow function.

[0033] This disclosure allows for adjustment of the thread fit depth between the rotating adjusting sleeve and the valve cavity, thereby adjusting the pre-compression of the elastic device and consequently changing the opening pressure threshold of the needle valve. This enables the check valve to adapt to different operating conditions. The pressure-regulating check valve of this disclosure achieves adjustable opening pressure, adapting to system pressure changes without replacing the entire check valve, thus improving system flexibility and economy.

[0034] For ease of understanding, please refer to the following: Figures 1 to 3 The specific structure and working principle of the reversing valve with position detection disclosed herein will be described in detail with reference to an embodiment.

[0035] This disclosure provides a one-way valve with pressure regulation, such as Figure 1 and Figure 2 As shown, the pressure-regulating check valve includes at least: a valve body 1, a valve cavity 10 disposed therein, and a first channel 11 and a second channel 12 respectively communicating with the valve cavity 10, with an opening 13 between the valve cavity 10 and the first channel 11; a valve core assembly 2, including an adjusting sleeve 21 configured to be threadedly connected to the valve cavity 10; the valve core assembly 2 also includes a needle valve 23 connected to the adjusting sleeve 21 via an elastic device 22, wherein when the pressure of the working medium in the first channel 11 is greater than a threshold, the needle valve 23 is pushed to open the opening 13 against the elastic force of the elastic device 22; and when the pressure is less than the threshold, the needle valve 23 is configured to close the opening 13 from the first channel 11 to the valve cavity 10 under the action of the elastic device 22.

[0036] In the initial state of the pressure-regulated check valve of this disclosure, when the pressure of the working medium in the first channel 11 is lower than a set threshold, the needle valve 23, under the elastic force of the elastic device 22, presses tightly against the opening 13, closing the channel between the first channel 11 and the valve chamber 10, and preventing the flow of the working medium. When the pressure in the first channel 11 rises and exceeds the set threshold, the pressure of the working medium pushes the needle valve 23 to overcome the elastic force of the elastic device 22, causing the needle valve 23 to move away from the opening 13, allowing the working medium to flow from the first channel 11 into the valve chamber 10 and out through the second channel 12, achieving unidirectional flow. When the pressure drops below the threshold, the rebound force of the elastic device 22 pushes the needle valve 23 to reset, re-closing the opening 13, cutting off the backflow of the working medium, and ensuring the unidirectional flow function.

[0037] This disclosure allows for adjustment of the threaded engagement depth between the rotating adjusting sleeve 21 and the valve chamber 10, thereby adjusting the pre-compression of the elastic device 22 and consequently changing the opening pressure threshold of the needle valve 23. This enables the check valve to adapt to different operating conditions. The pressure-regulating check valve provided by this disclosure, through the design of the valve core assembly 2 and the valve chamber 10 being relatively movable, allows the opening pressure of the check valve to be adjusted flexibly according to system requirements, rather than being a fixed value. This stepless adjustment of the opening pressure threshold allows the check valve to adapt to changes in pressure conditions in real time, reducing maintenance costs and improving the adaptability of the hydraulic system and its operating efficiency.

[0038] In one embodiment of this disclosure, reference is made to Figure 1 and Figure 2 A threaded area 211 is provided on the outer wall of the adjusting sleeve 21, and at least partially threaded structures may be provided in the threaded area 211. A mating area 15 is provided on the inner wall of the valve cavity 10 at a position corresponding to the threaded area 211, and a threaded structure adapted to the thread in the threaded area 211 may be provided in the mating area 15. Within the adjustable range of the adjusting sleeve 21, the threaded area 211 always maintains a mating with at least partially mating area 15. When the adjusting sleeve 21 is screwed to the maximum value of the opening pressure threshold of the needle valve 23, the thread at the lower position of the threaded area 211 can engage with the thread at the upper position of the mating area 15, thereby achieving the maximum pre-compression of the elastic device 22; when the adjusting sleeve 21 is screwed to the minimum value of the opening pressure threshold of the needle valve 23, the thread at the upper position of the threaded area 211 can engage with the thread at the lower position of the mating area 15, thereby achieving the minimum pre-compression of the elastic device 22.

[0039] In one specific embodiment of this disclosure, such as Figure 2As shown, the needle valve 23 includes a conical sealing portion 231. When the needle valve 23 closes the opening 13, the conical surface of the sealing portion 231 forms a line seal with the opening 13 to prevent the working medium from flowing from the second channel 12 to the first channel 11. This line seal structure has significant performance advantages over traditional surface seals. Its sealing portion 231 can completely seal the opening 13, effectively blocking the backflow of the working medium. Because the contact area between the sealing portion 231 and the opening 13 is small, it not only reduces the frictional resistance during the opening and closing process, making the valve core assembly 2 more sensitive, but also significantly reduces the jamming phenomenon caused by friction.

[0040] In one specific embodiment of this disclosure, such as Figure 1 As shown, the axis of the first channel 11 is parallel to the axis of the second channel 12. This parallel layout optimizes the internal flow channel structure of the valve body 1, making the working medium flow more smoothly. At the same time, this structure simplifies the processing technology of the valve body 1, reduces manufacturing costs, and facilitates straight connection with other pipeline systems, reducing the need for elbows or adapters during installation, and improving the overall compactness and sealing reliability of the system.

[0041] In one specific embodiment of this disclosure, such as Figure 1 As shown, the axis of the valve chamber 10 is perpendicular to the axis of the first channel 11. This perpendicularity design ensures that the movement direction of the valve core assembly 2 is orthogonal to the flow direction of the working medium. This vertical arrangement effectively reduces the overall size of the check valve, making it more compact and easier to install in space-constrained piping systems. Furthermore, when the opening 13 is closed, the hydraulic pressure of the working medium acts perpendicularly on the end face of the needle valve 23, forming a uniform sealing force and reducing the risk of leakage.

[0042] In one specific embodiment of this disclosure, such as Figure 1 and Figure 2 As shown, the adjusting sleeve 21 has a groove 24 extending along the axial direction of the valve cavity 10, and the elastic device 22 is disposed in the groove 24; the needle valve 23 also includes an extension 232, which is disposed at the end of the sealing part 231 away from the first channel 11 and is configured to at least partially extend into the groove 24; wherein, the groove 24 and the extension 232 extend in the same direction. The extension 232 of the needle valve 23 can be integrally formed with the sealing part 231. In this embodiment, the elastic device 22 can be a spring, the sealing part 231 is approximately conical, and the extension 232 can be a cylindrical structure disposed at the center of the bottom surface of the cone. One end of the spring abuts against the groove 24, and the other end is sleeved on the outer periphery of the extension 232 and cooperates with the bottom surface of the sealing part 231.

[0043] Specifically, the groove 24 is adapted to the size of the spring, and the groove 24 and the extension 232 cooperate to form a guide structure, thus enabling the needle valve 23 to move strictly along the axis of the valve cavity 10, avoiding lateral deviation. The cooperation between the groove 24 and the extension 232 restricts the needle valve 23 to move only axially, preventing the needle valve 23 from tilting during movement and ensuring the sealing effect of the sealing part 231. In addition, this disclosure provides an elastic device 22 in the groove 24, thereby utilizing the internal space of the adjusting sleeve 21, making the entire one-way valve structure more compact.

[0044] In one specific embodiment of this disclosure, such as Figure 1 and Figure 2 As shown, multiple stepped throttling grooves 14 are provided in the valve cavity 10 corresponding to the sealing part 231; the inner diameters of the multiple throttling grooves 14 increase sequentially in the direction gradually moving away from the opening 13. Specifically, when the pressure of the working medium in the first channel 11 is greater than the threshold, the needle valve 23 overcomes the elastic force of the elastic device 22 and moves away from the opening 13. At this time, the working medium flows from the first channel 11 into the second channel 12 through the throttling grooves 14. The stepped arrangement and sequentially increasing inner diameter of the multiple throttling grooves 14 allow the working medium to undergo a gradual adjustment of the flow channel cross-sectional area when passing through the throttling grooves 14, rather than a sudden change in flow velocity and flow rate. Therefore, the throttling grooves 14 optimize the flow characteristics of the working medium, and can gradually adjust the flow velocity and flow rate of the working medium entering the second channel 12 from the opening 13, making the flow of the working medium more stable, thereby extending the service life of the check valve.

[0045] In one specific embodiment of this disclosure, such as Figure 3As shown, a gasket 25 is provided between the needle valve 23 and the elastic device 22. One end of the elastic device 22 abuts against the adjusting sleeve 21, and the other end abuts against the end of the needle valve 23 away from the first channel 11 via the gasket 25, and applies a pre-tightening force to the needle valve 23 via the gasket 25. Specifically, a through hole is provided in the middle of the gasket 25, and the extension 232 of the needle valve 23 passes through the through hole and engages with the first surface of the gasket 25. The elastic device 22 is sleeved on the outer periphery of the extension 232 and abuts against the other surface of the gasket 25. The outer diameter of the gasket 25 can be larger than the inner diameter of the groove 24 in the adjusting sleeve 21. Thus, during the movement of the needle valve 23 away from the opening 13, the sealing part 231 of the needle valve 23 can avoid direct contact with the adjusting sleeve 21. This design can prevent the needle valve 23 from failing to reset under the elastic force of the elastic device 22 due to the adhesion between the sealing part 231 and the adjusting sleeve 21, or the working medium from flowing into the second channel 12 from the opening 13 before reaching the opening pressure. In addition, the gasket 25 can compensate for the assembly gap between the elastic device 22 and the needle valve 23, thereby ensuring that the elastic device 22 has sufficient preload so that the elastic device 22 is in a compressed state when it is not subjected to external force or has a small external force; the gasket 25 can also play a buffering and shock absorption role, thereby reducing the impact of the elastic device 22 on the needle valve 23 during operation.

[0046] In one specific embodiment of this disclosure, such as Figure 3 As shown, an annular sealing assembly 26 is provided on the outer periphery of the adjusting sleeve 21. The annular sealing assembly 26 is configured to be at least partially pre-pressed between the outer wall of the adjusting sleeve 21 and the inner wall of the valve cavity 10. Specifically, the annular sealing assembly 26 includes an O-ring 261 and a polytetrafluoroethylene (PTFE) retainer ring 262. The O-ring is sleeved on the outer periphery of the adjusting sleeve 21 to seal and prevent oil leakage. The PFE retainer ring 262 is adjacent to the O-ring and disposed in a direction away from the opening 13 to prevent the O-ring 261 from being extruded axially. The annular sealing assembly 26 fits tightly against the inner wall of the valve cavity 10, effectively preventing the working medium from leaking from the gap between the adjusting sleeve 21 and the valve cavity 10, ensuring that the check valve can achieve reliable sealing under high pressure or high precision conditions.

[0047] In one specific embodiment of this disclosure, such as Figure 3As shown, an annular stop 27 is provided at the end of the valve cavity 10 away from the first channel 11; the outer wall of the adjusting sleeve 21 is provided with a recess 271 that mates with the annular stop 27, and the outer diameter of the recess 271 is smaller than the inner diameter of the annular stop 27. Specifically, the annular stop 27 can be a wire retaining ring, the inner diameter of which is larger than the diameter of the recess 271 and smaller than the diameter of the adjusting sleeve 21 located at both ends of the recess 271. This allows the wire retaining ring to be inserted into the recess 271 and to mechanically limit the axial displacement range of the adjusting sleeve 21. The elastic deformation of the wire retaining ring allows it to fit tightly against the recess 271, providing reliable axial limiting, while allowing the adjusting sleeve 21 to flexibly adjust its position within a certain range, ensuring the stable operation of the valve core assembly 2. The annular stop 27 can prevent the needle valve 23 from retracting excessively under the pressure of the working medium, and avoid the valve core assembly 2 from falling out of its normal working position when the thread between the valve core assembly 2 and the valve cavity 10 loses its fixing function.

[0048] In one specific embodiment of this disclosure, the adjusting sleeve 21 is an internal hexagon adjusting sleeve. Compared with the conventional direct-acting relief valve structure, this internal hexagon adjusting sleeve design eliminates the need for a sleeve and a lift valve. The internal hexagon adjusting sleeve, elastic device 22, and needle valve 23 act directly on the valve body 1, reducing manufacturing costs and simplifying assembly. The internal hexagon structure allows for quick and precise adjustment using a standard hexagonal wrench, and the standardized interface of the internal hexagon adjusting sleeve facilitates maintenance and mass production, reducing manufacturing and maintenance costs.

[0049] In one specific embodiment of this disclosure, the pressure-regulating check valve is a tubular check valve. The tubular structure is more compact than plate-type or cartridge-type valves, making it suitable for space-constrained applications. It facilitates direct integration into hydraulic systems, reduces additional adapters, lowers the risk of leakage, and allows for individual disassembly and maintenance, reducing maintenance costs. This design not only reduces spare parts costs but also shortens maintenance time and improves equipment availability.

[0050] In one specific embodiment of this disclosure, such as Figure 3 As shown, the outer circumference of the valve core assembly 2, away from the opening 13, is threaded and connected to the locking nut 3 via the thread. A spacer (not shown in the figure) is provided between the locking nut 3 and the valve body 1. The locking nut 3 is tightened through the threaded engagement to lock the opening pressure of the valve core assembly 2. By adjusting the tightening position of the locking nut 3, precise control of the preload of the valve core assembly 2 can be achieved, thereby flexibly adjusting the opening pressure according to system requirements and ensuring the reliability and stability of the check valve under different operating conditions.

[0051] In one specific embodiment of this disclosure, the pressure-regulated check valve has an inlet diameter of φ5, a pressure regulation range of 0.3-1.2 MPa, a maximum flow rate of 3 L / min, a maximum working pressure of 1.2 MPa, and a leakage rate of less than 0.5 mL / min. The pressure-regulated check valve provided in this disclosure can adopt a compact structural design, featuring small size and high integration. This check valve can maintain a stable pressure output during operation, while maintaining low operating noise, making it particularly suitable for back pressure control requirements in low-flow systems and possessing good engineering applicability.

[0052] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A pressure-regulated check valve, characterized by, include: The valve body has a valve cavity and a first channel and a second channel that are respectively connected to the valve cavity, and an opening is provided between the valve cavity and the first channel; A valve core assembly, the valve core assembly including an adjusting sleeve configured to be threadedly connected to the valve cavity; The valve core assembly also includes a needle valve connected to the adjusting sleeve via an elastic device. When the pressure of the working medium in the first channel is greater than a threshold, the needle valve is pushed to overcome the elastic force of the elastic device and open the opening. And when the pressure is less than a threshold, the needle valve is configured to close the opening from the first channel to the valve chamber under the action of an elastic device.

2. The pressure-regulated check valve of claim 1, wherein, The needle valve includes a tapered sealing portion. When the needle valve closes the opening, the tapered surface of the sealing portion forms a line seal with the opening to prevent the working medium from flowing from the second channel to the first channel.

3. The pressure-regulated check valve of claim 2, wherein, The axis of the first channel is parallel to the axis of the second channel.

4. The pressure-regulated check valve of claim 3, wherein, The axis of the valve chamber is perpendicular to the axis of the first channel.

5. The pressure-regulated check valve of claim 2, wherein, The adjusting sleeve has a groove extending along the axial direction of the valve cavity, and the elastic device is disposed in the groove; the needle valve also includes an extension portion, which is disposed at the end of the sealing portion away from the first channel and is configured to at least partially extend into the groove; wherein the groove and the extension portion extend in the same direction.

6. The pressure-regulated check valve of claim 2, wherein, In the valve cavity, corresponding to the position of the sealing part, a plurality of throttling grooves are provided in a stepped arrangement; the inner diameter of the plurality of throttling grooves increases sequentially in the direction gradually away from the opening.

7. The pressure-regulated check valve of claim 1, wherein, A gasket is provided between the needle valve and the elastic device; one end of the elastic device abuts against the adjusting sleeve, and the other end abuts against the end of the needle valve away from the first channel through the gasket, and applies a pre-tightening force to the needle valve through the gasket.

8. The pressure-regulated check valve of claim 1, wherein, An annular sealing assembly is provided on the outer periphery of the adjusting sleeve, and the annular sealing assembly is configured to be at least partially pre-pressed between the outer wall of the adjusting sleeve and the inner wall of the valve cavity.

9. The pressure-regulated check valve of claim 1, wherein, An annular stop is provided at the end of the valve cavity away from the first channel; the outer wall of the adjusting sleeve is provided with a recess that cooperates with the annular stop, and the outer diameter of the recess is smaller than the inner diameter of the annular stop.

10. The pressure-regulated check valve of claim 1, wherein, The adjusting sleeve is an internal hexagon adjusting sleeve.

11. The pressure-regulated check valve of claim 1, wherein, The pressure-regulating check valve is a tubular check valve.

Images