Check valve

Abstract

Disclosed is a check valve, comprising a valve body (10), a valve seat (20) and a disc assembly (30), wherein the valve body (10) is provided with a flow passage (11), the valve seat (20) is arranged in the valve body (10), a valve seat orifice (21) extends through the valve seat (20), the valve seat orifice (21) is in communication with the flow passage (11), an opening (12) is provided on a side surface of the valve body (10), the disc assembly (30) comprises a hinge arm (31), the hinge arm (31) is disposed on an inner side of the opening (12), a disc body (32) is rotatably connected to the hinge arm (31), the disc body (32) is capable of closing the opening (12) or rotating toward the flow passage (11) to close the valve seat orifice (21), at least one sealing groove (22) is provided on an end surface of the valve seat (20) facing the disc assembly (30), the sealing groove (22) is disposed around the valve seat orifice (21), and a first sealing member (23) is arranged within the sealing groove (22). Providing at least one sealing groove and a first sealing member helps improve sealing performance between a valve seat and a disc body, preventing sand proppant ingress into a clearance between the disc body and the valve seat, and thereby improving check valve service life.

Description

single-flow valve

[0001] This application claims priority to the patent application filed on March 26, 2025, with China National Intellectual Property Administration, application number 202510368421.8, entitled "One-way valve". Technical Field

[0002] This disclosure relates to the field of oil and gas field construction equipment technology, and more particularly to the field of valve technology, specifically to a single-flow valve. Background Technology

[0003] In oilfield fracturing operations, to prevent safety accidents caused by the backflow of high-pressure fluids in oil and gas wells, it is usually necessary to add a check valve to the fracturing manifold system; when fluid flows back, the baffle automatically closes to intercept the flow. As energy development moves to deeper formations, production conditions become increasingly complex, and operating pressures gradually increase, sometimes even reaching over 140 MPa; however, check valves, mainly with pressure ratings of 105 MPa and 140 MPa, can no longer meet the operational requirements.

[0004] Meanwhile, existing one-way valves primarily rely on the sulfurization of a non-metallic layer on the valve plate surface. During reverse flow control, the valve plate and valve seat end face are tightly fitted under the force of the high-pressure fluid, achieving a seal through the deformation of the non-metallic layer. However, because the valve plate's movement along the flow channel is unrestricted, the non-metallic layer can be excessively compressed and damaged under the immense force of the high-pressure fluid. Upon re-operation, the fluid will flow forward against the valve plate, and under the high-speed scouring of the fracturing fluid, the damaged areas of the sulfurized layer become weak points, gradually damaging and peeling off, thus losing its sealing function. Furthermore, during use, fracturing sand can also enter the gaps between moving parts, causing wear on the valve assembly and reducing the product's service life.

[0005] Therefore, existing technologies suffer from technical problems such as the inability of existing single-flow valves to meet ultra-high pressure operating requirements, poor sealing performance, and short service life. Summary of the Invention

[0006] The main objective of this disclosure is to provide a flow valve to solve the problems of existing flow valves in the related art, such as inability to meet ultra-high pressure operating pressure, poor sealing effect, and short service life.

[0007] To achieve the above objectives, according to one aspect of this disclosure, a one-way valve is provided, comprising a valve body, a valve seat, and a valve plate assembly. The valve body has a flow channel, the valve seat is disposed within the valve body, and a valve seat hole is provided through the valve seat, the valve seat hole communicating with the flow channel. An opening is provided on the side of the valve body. The valve plate assembly includes a valve plate bracket, the valve plate bracket being disposed inside the opening. A valve plate body is rotatably connected to the valve plate bracket. The valve plate body is capable of closing the opening or rotating toward the flow channel to close the valve seat hole. At least one sealing groove is provided on the end face of the valve seat facing the valve plate assembly, the sealing groove surrounding the valve seat hole, and a first sealing element is disposed within the sealing groove.

[0008] Furthermore, the valve plate bracket includes an annular bracket body with two mounting holes opposite each other on the bracket body. A rotating shaft is provided between the two mounting holes, the valve plate body is sleeved on the rotating shaft, and a bushing is provided between the rotating shaft and the mounting holes.

[0009] Furthermore, a first mounting step is provided on the opening, and the main body of the bracket is mounted on the first mounting step.

[0010] Furthermore, an arc-shaped first limiting boss is provided on the bottom surface of the support body, and a weight-reducing sink is provided on the surface of the valve plate body away from the valve seat to cooperate with the first limiting boss.

[0011] Furthermore, the bottom surface of the bracket body is provided with a second limiting boss, and the first mounting step is provided with a positioning groove that matches the second limiting boss.

[0012] Furthermore, the one-way valve also includes a valve cover, which is disposed on the outside of the valve plate assembly. At least a portion of the valve cover abuts against the valve plate support, and an elastic element is disposed between the valve cover and the valve plate support.

[0013] Furthermore, the valve seat is disposed in the valve body, a third limiting boss is provided on the inner wall of the valve body, a second mounting step is provided at the end of the valve seat to cooperate with the third limiting boss, a second sealing element is provided axially between the inner wall of the valve body and the outer wall of the valve seat, and a third sealing element is provided radially between the third limiting boss and the second mounting step.

[0014] Furthermore, the first seal includes at least a resilient seal.

[0015] Furthermore, the sealing groove has an opening and a bottom, and the width of the opening of the sealing groove is smaller than the width of the bottom of the sealing groove.

[0016] Furthermore, the sealing groove has two sidewalls extending from the bottom of the groove to the opening of the groove, and both sidewalls are set at an acute angle to the bottom of the groove.

[0017] Furthermore, the sealing groove has two sidewalls extending from the bottom of the groove to the opening of the groove, and at least one of the two sidewalls is arranged perpendicularly to the bottom of the groove.

[0018] Furthermore, the first seal also includes a retaining ring, which is disposed between the sidewall perpendicular to the bottom of the groove and the elastic seal.

[0019] The one-way valve provided in this application facilitates the installation and maintenance of the valve assembly by providing an opening on the side of the valve body and placing the valve bracket inside the opening. By providing at least one sealing groove on the end face of the valve seat facing the valve plate assembly and placing a first sealing element within the sealing groove, with the sealing element positioned on the end face of the valve seat facing away from the fluid, the scouring area can be avoided, reducing wear on the valve seat during use. The sealing groove and the first sealing element improve the sealing effect between the valve seat and the valve plate body, preventing fracturing sand from entering the gap between the valve plate body and the valve seat, thereby extending the service life of the one-way valve. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure. In the drawings:

[0021] Figure 1 shows a schematic diagram of the structure of a single-flow valve according to the present disclosure;

[0022] Figure 2 shows a cross-sectional view of a one-way valve according to the present disclosure;

[0023] Figure 3 shows a cross-sectional view of the air inlet of the one-way valve according to the present disclosure;

[0024] Figure 4 shows a cross-sectional view of the air chamber of the one-way valve according to the present disclosure;

[0025] Figure 5 shows a top view of a single-flow valve according to the present disclosure;

[0026] Figure 6 shows a cross-sectional view of the mixing chamber of the single-flow valve according to the present disclosure.

[0027] The above-mentioned figures include the following reference numerals: 10, valve body; 11, flow channel; 12, opening; 121, first mounting step; 13, third limiting boss; 20, valve seat; 21, valve seat hole; 22, sealing groove; 221, groove opening; 222, groove bottom; 23, first seal; 231, elastic seal; 232, retaining ring; 24, second mounting step; 25, second seal; 26, third seal; 30, valve plate assembly; 31, valve plate bracket; 311, bracket body; 312, mounting hole; 313, rotating shaft; 314, bushing; 315, first limiting boss; 316, second limiting boss; 32, valve plate body; 321, weight reduction countersunk; 40, valve cover; 41, lifting eye screw; 42, clearance groove. Detailed Implementation

[0028] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. 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. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0031] To address the problems of existing single-flow valves failing to meet ultra-high pressure operating requirements, having poor sealing performance, and short service life, this application provides a single-flow valve.

[0032] As shown in Figures 1 to 6, this application provides a one-way valve. As shown in Figure 1, the one-way valve includes a valve body 10, a valve seat 20, and a valve plate assembly 30. The valve body 10 has a flow channel 11. The valve seat 20 is disposed inside the valve body 10, and a valve seat hole 21 is provided through the valve seat 20, which communicates with the flow channel 11, so that the fluid entering the one-way valve can pass through the flow channel 11 and the valve seat hole 21. An opening 12 is provided on the side of the valve body 10. The valve plate assembly 30 includes a valve plate support 31 and a valve plate. The bracket 31 is disposed inside the opening 12. The valve plate body 32 is rotatably connected to the valve plate bracket 31. The valve plate body 32 can close the opening 12 or rotate toward the flow channel 11 to close the valve seat hole 21. At least one sealing groove 22 is provided on the end face of the valve seat 20 facing the valve plate assembly 30. The sealing groove 22 is disposed around the valve seat hole 21. A first sealing element 23 is disposed in the sealing groove 22, so that the sealing between the valve seat 20 and the valve plate body 32 can be achieved through the first sealing element 23.

[0033] The one-way valve provided in this application facilitates the installation and maintenance of the valve assembly by providing an opening 12 on the side of the valve body 10 and placing the valve plate bracket 31 inside the opening 12. At least one sealing groove 22 is provided on the end face of the valve seat 20 facing the valve plate assembly 30, and a first sealing element 23 is provided within the sealing groove 22. By placing the sealing element on the end face of the valve seat 20, facing away from the fluid, the scouring area can be avoided, reducing wear on the valve seat 20 during use. The sealing groove 22 and the first sealing element 23 improve the sealing effect between the valve seat 20 and the valve plate body 32, preventing fracturing sand from entering the gap between the valve plate body 32 and the valve seat 20, thereby improving the service life of the one-way valve.

[0034] Specifically, as shown in Figure 3, two sealing grooves 22 can be provided on the end face of the valve seat 20. Both sealing grooves 22 surround the valve seat hole 21 and are arranged in a ring shape. A first sealing element 23 is provided within each sealing groove 22, thus forming a labyrinthine sealing structure on the end face of the valve seat 20. This arrangement helps to further improve the sealing effect, enabling the check valve to withstand higher pressures, such as 175 MPa, meeting the requirements of harsh operating conditions.

[0035] Furthermore, the first seal 23 includes at least an elastic seal 231, thereby forming a sealing pair between the valve plate assembly 30 and the valve seat 20 while reducing the cost of use and maintenance.

[0036] In one specific embodiment of this application, as shown in Figures 3 and 4, the sealing groove 22 has a groove opening 221 and a groove bottom 222. The width of the groove opening 221 is smaller than the width of the groove bottom 222. During use, the first sealing element 23 is disposed within the sealing groove 22, and the size of the first sealing element 23 matches the size of the sealing groove 22, so that the smaller groove opening 221 can engage the first sealing element 23 during sealing. During assembly, the first sealing element 23 is installed within the sealing groove 22 and can be directly removed with the valve assembly, reducing the difficulty of disassembly and avoiding damage to the sealing element when it is disassembled separately.

[0037] Specifically, the sealing groove 22 has two sidewalls extending from the bottom 222 to the opening 221. Both sidewalls are set at an acute angle to the bottom 222, that is, the cross-section of the sealing groove 22 is dovetail-shaped. The elastic seal 231 is an annular seal with a circular cross-section. The diameter of the elastic seal 231 is smaller than the width of the opening 221, so that most of the elastic seal 231 is housed in the sealing groove 22. This arrangement is more conducive to improving the service life of the seal and reducing the difficulty of disassembling the seal.

[0038] In one specific embodiment, as shown in FIG4, the sealing groove 22 has two sidewalls extending from the bottom 222 to the opening 221, and at least one of the two sidewalls is arranged perpendicularly to the bottom 222. By setting at least one of the sidewalls perpendicular to the bottom 222, it is easier for the first seal 23 to enter the sealing groove 22, which is beneficial to improving the assembly efficiency of the first seal 23.

[0039] Specifically, the first sealing element 23 further includes a retaining ring 232, which is disposed between the side wall perpendicular to the bottom of the groove 222 and the elastic sealing element 231. Preferably, the retaining ring 232 is a hard retaining ring, and the side of the retaining ring 232 facing the elastic sealing element 231 has an arc-shaped contact surface. During use, the retaining ring 232 abuts against the elastic sealing element 231, thereby improving the extrusion resistance of the elastic sealing element 231, which is conducive to further improving the sealing effect of the sealing element and meeting the sealing requirements of ultra-high pressure.

[0040] Further, as shown in Figures 5 and 6, the valve plate bracket 31 includes an annular bracket body 311. Two mounting holes 312 are provided opposite to each other on the bracket body 311. A rotating shaft 313 is installed between the two mounting holes 312. The valve plate body 32 is sleeved on the rotating shaft 313, thereby realizing the rotational connection between the valve plate body 32 and the bracket body 311. A bushing 314 is provided between the rotating shaft 313 and the mounting hole 312. That is, the bushing 314 is provided on the outer periphery of the rotating shaft 313 inside the mounting hole 312, thereby avoiding wear between the rotating shaft 313 on both sides and the mounting hole 312, which helps to extend the service life of the rotating shaft 313.

[0041] Specifically, bushing 314 can be made of cemented carbide or tungsten carbide alloy; thus, by selecting high-strength materials, the strength and wear resistance of bushing 314 can be further improved.

[0042] In one specific embodiment of this application, the surface of the rotating shaft 313 can also undergo surface strengthening treatment, thereby increasing the surface hardness without reducing the toughness of the rotating shaft 313; the end faces of the valve plate body 32 and the valve seat 20 are also subjected to surface hardening treatment to improve surface hardness and increase erosion resistance. Surface strengthening treatment can be, for example, laser cladding, spray welding, spraying, surface quenching, or chemical heat treatment such as carburizing and nitriding. During use, a suitable treatment method can be selected for surface hardening treatment of the valve plate body 32 or the valve seat 20, considering surface adhesion, corrosion resistance, and hardness requirements.

[0043] To facilitate the assembly of the components inside the valve body 10, a first mounting step 121 is provided on the opening 12 of the valve body 10. During the installation process, the bracket body 311 is placed on the first mounting step 121, thereby supporting and fixing the bracket body 311 through the first mounting step 121.

[0044] Furthermore, the bottom surface of the support body 311 has an arc-shaped first limiting boss 315, and the surface of the valve plate body 32 away from the valve seat 20 is provided with a weight-reducing recess 321 that cooperates with the first limiting boss 315. Thus, when the valve plate body 32 closes the opening 12, the weight-reducing recess 321 can abut against the surface of the first limiting boss 315. By providing a weight-reducing recess 321 on the side of the valve plate body 32 away from the valve seat 20 to reduce weight, the valve plate body 32 can open at a larger angle and higher under the same flow rate while ensuring strength. This helps reduce the scouring of the valve plate body 32 by the fluid and reduce wear on the valve plate. Preferably, a weight-reducing groove can also be provided on the side of the valve plate body 32 away from the valve seat 20.

[0045] To facilitate positioning of the bracket body 311 during installation, a second limiting boss 316 is provided on the bottom surface of the bracket body 311, and a positioning groove matching the second limiting boss 316 is provided on the first mounting step 121. During installation, the second limiting boss 316 cooperates with the positioning groove to restrict the circumferential movement of the bracket body 311, preventing the bracket body 311 from rotating or tilting slightly as the valve cover 40 is installed, which would not guarantee uniform compression of the valve seat 20 end face seal and reduce its service life. This arrangement helps to improve the sealing performance between the valve plate assembly 30 and the valve seat 20.

[0046] As shown in Figure 1, the one-way valve of this application also includes a valve cover 40, which is disposed on the outside of the valve plate assembly 30 and detachably installed at the opening 12 on the side of the valve body 10. After installation, at least a portion of the valve cover 40 abuts against the valve plate bracket 31, thereby fixing the valve plate bracket 31. An elastic element is provided between the valve cover 40 and the valve plate bracket 31, and the elastic element achieves elastic abutment against the valve plate bracket 31, avoiding vibration of the valve plate bracket 31 caused by fluid pulsation.

[0047] Specifically, the elastic element can be, for example, a wave spring. During installation, the valve cover 40 is screwed into place to deform the wave spring and generate a preload, thereby making the valve plate bracket 31 fit tightly against the valve body 10. The wave spring facilitates the assembly of the valve cover 40 and further avoids the vibration of the valve plate bracket 31 caused by the passage of pulsating fluid, reducing the wear of metal mating parts.

[0048] Optionally, a lifting eye screw 41 is also installed on the side of the valve cover 40 away from the valve plate bracket 31, which facilitates the transfer and hoisting of the product during installation. A sealing element is provided between the valve cover 40 and the valve body 10 to prevent impurities from entering the threaded gap between the valve cover 40 and the valve body 10, ensuring proper thread fit and avoiding assembly errors caused by damage to the thread surface.

[0049] Among them, the valve cover 40 is provided with a relief groove 42 on the side opposite to the valve plate assembly 30 to avoid the impact that the valve plate body 32 may cause to the valve cover 40 during use. The bottom of the relief groove 42 is connected to the side wall by an arc. The depth of the relief groove 42 is slightly greater than the thickness of the valve plate body 32, so as to avoid the fluid from generating turbulence or rapid flow in the flow channel 11.

[0050] Preferably, the surface of the flow channel 11 of the valve body 10 is also rounded to eliminate any structural abrupt changes that may occur in the fluid flow area. This arrangement facilitates the smooth flow of fluid within the flow channel 11 and avoids turbulence caused by abrupt changes in the mechanical structure.

[0051] Furthermore, the valve seat 20 can be integrally formed with the valve body 10, or it can be detachably disposed within the valve body 10. To facilitate the assembly of the valve seat 20, as shown in Figures 1 and 2, a third limiting boss 13 is provided on the inner wall of the valve body 10, and a second mounting step 24 that mates with the third limiting boss 13 is provided at the end of the valve seat 20. A second sealing element 25 is provided axially between the inner wall of the valve body 10 and the outer wall of the valve seat 20, and a third sealing element 26 is provided radially between the third limiting boss 13 and the second mounting step 24. By providing the second sealing element 26 and the third sealing element 26 between the valve body 10 and the valve seat 20, the gap between the end face of the valve seat 20 and the valve body 10 can be effectively sealed, preventing sand accumulation in the gap between the valve seat 20 and the valve body 10, which is beneficial to improving the service life of the valve seat 20 and facilitating the installation and disassembly of the valve seat 20.

[0052] The second seal 25 and the third seal 26 are configured in the same way as the first seal 23, and will not be described again here.

[0053] The one-way valve provided in this application facilitates the installation and maintenance of the valve assembly by providing an opening on the side of the valve body and placing the valve bracket inside the opening. By providing at least one sealing groove on the end face of the valve seat facing the valve plate assembly and placing a first sealing element within the sealing groove, with the sealing element positioned on the end face of the valve seat facing away from the fluid, the scouring area can be avoided, reducing wear on the valve seat during use. The sealing groove and the first sealing element improve the sealing effect between the valve seat and the valve plate body, preventing fracturing sand from entering the gap between the valve plate body and the valve plate bracket. This makes it suitable for ultra-high pressure applications and effectively solves the technical problems of existing one-way valves, such as inability to meet ultra-high pressure operating pressures, poor sealing performance, and short service life.

[0054] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0057] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A one-way valve, characterized in that, The valve includes a valve body, a valve seat, and a valve plate assembly. The valve body has a flow channel, and the valve seat is disposed within the valve body. A valve seat hole is provided through the valve seat and communicates with the flow channel. An opening is provided on the side of the valve body. The valve plate assembly includes a valve plate bracket, which is disposed inside the opening. A valve plate body is rotatably connected to the valve plate bracket. The valve plate body can close the opening or rotate toward the flow channel to close the valve seat hole. At least one sealing groove is provided on the end face of the valve seat facing the valve plate assembly. The sealing groove surrounds the valve seat hole, and a first sealing element is disposed within the sealing groove.

2. The one-way valve according to claim 1, characterized in that, The valve plate bracket includes an annular bracket body with two mounting holes opposite each other. A rotating shaft is provided between the two mounting holes. The valve plate body is sleeved on the rotating shaft, and a bushing is provided between the rotating shaft and the mounting holes.

3. The one-way valve according to claim 2, characterized in that, A first mounting step is provided on the opening, and the main body of the bracket is mounted on the first mounting step.

4. The one-way valve according to claim 2, characterized in that, The bottom surface of the support body has an arc-shaped first limiting boss, and the surface of the valve plate body away from the valve seat is provided with a weight-reducing sink that cooperates with the first limiting boss.

5. The one-way valve according to claim 3, characterized in that, The bottom surface of the bracket body is provided with a second limiting boss, and the first mounting step is provided with a positioning groove that matches the second limiting boss.

6. The one-way valve according to claim 1, characterized in that, The single-flow valve also includes a valve cover, which is disposed on the outside of the valve plate assembly. At least a portion of the valve cover abuts against the valve plate support, and an elastic element is disposed between the valve cover and the valve plate support.

7. The one-way valve according to claim 1, characterized in that, The valve seat is disposed in the valve body, a third limiting boss is provided on the inner wall of the valve body, a second mounting step is provided at the end of the valve seat to cooperate with the third limiting boss, a second sealing element is provided axially between the inner wall of the valve body and the outer wall of the valve seat, and a third sealing element is provided radially between the third limiting boss and the second mounting step.

8. The one-way valve according to claim 1, characterized in that, The first seal includes at least a resilient seal.

9. The one-way valve according to claim 8, characterized in that, The sealing groove has an opening and a bottom, and the width of the opening of the sealing groove is smaller than the width of the bottom of the sealing groove.

10. The one-way valve according to claim 9, characterized in that, The sealing groove has two sidewalls extending from the bottom of the groove to the opening of the groove, and both sidewalls are set at an acute angle to the bottom of the groove.

11. The one-way valve according to claim 9, characterized in that, The sealing groove has two sidewalls extending from the bottom of the groove to the opening of the groove, and at least one of the two sidewalls is arranged perpendicular to the bottom of the groove.

12. The one-way valve according to claim 11, characterized in that, The first sealing element further includes a retaining ring, which is disposed between the side wall perpendicular to the bottom of the groove and the elastic sealing element.

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