Check valve

Abstract

The check valve comprises a valve body, a valve seat and a valve plate assembly, the valve body is provided with a flow channel, the valve seat is arranged in the valve body, a valve seat hole is formed in the valve seat in a penetrating mode, the valve seat hole is communicated with the flow channel, an opening is formed in the side face of the valve body, and the valve plate assembly comprises a valve plate support arranged on the inner side of the opening. The valve plate support is rotatably connected with a valve plate body, the valve plate body can seal the opening or rotate towards the flow channel to seal the valve seat hole, at least one sealing groove is formed in the end face, facing the valve plate assembly, of the valve seat, the sealing groove is formed around the valve seat hole, and a first sealing piece is arranged in the sealing groove; by arranging at least one sealing groove and the first sealing piece, the sealing effect between the valve seat and the valve plate body is improved, fracturing sand is prevented from entering a gap between the valve plate body and the valve plate support, and therefore the service life of the one-way valve is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field construction equipment, and particularly to the technical field of valves. Specifically, the present invention relates to a check valve. Background Art

[0002] In oilfield fracturing operations, in order to avoid safety accidents caused by the backflow of high-pressure fluids in oil and gas wells, a check valve is usually added to the fracturing manifold system; when the fluid flows back, the baffle automatically closes to play a role in reverse interception. As energy development moves towards deeper formations, the production conditions are becoming more and more complex, and the operating pressure is gradually increasing, even reaching above 140 MPa; however, the pressure ratings of check valves are mainly 105 MPa and 140 MPa, which can no longer meet the requirements of the operations.

[0003] At the same time, in existing check valves, the valve plate surface is mainly vulcanized with non-metal. When intercepting the flow in the reverse direction, under the action of high-pressure fluid, the valve plate closely fits with the end face of the valve seat, and thus the seal is achieved through the deformation of the non-metal layer. However, since the movement of the valve plate in the direction of the flow passage hole is not limited, the non-metal layer will be excessively squeezed and damaged under the huge action of high-pressure fluid. When the operation is carried out again, the fluid will impact the valve plate in the forward direction. Under the erosion of the high-speed sand-carrying fluid, the damaged area of the vulcanized layer of the valve plate will become a weak point, and the vulcanized layer will gradually be damaged and peeled off, losing the sealing function. During use, fracturing sand will also enter the gaps of moving parts, causing wear of the valve assembly and reducing the service life of the product.

[0004] Therefore, in the prior art, there are technical problems that the existing check valves cannot meet the ultra-high pressure operating pressure, have poor sealing effect, and low service life. Summary of the Invention

[0005] The main purpose of the present invention is to provide a check valve to solve the problems in the prior art that the existing check valves cannot meet the ultra-high pressure operating pressure, have poor sealing effect, and low service life.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided a check valve, including a valve body, a valve seat, and a valve plate assembly. The valve body has a flow passage, the valve seat is disposed in the valve body, a valve seat hole is penetratingly provided on the valve seat, the valve seat hole is communicated with the flow passage, an opening is provided on the side surface of the valve body, the valve plate assembly includes a valve plate bracket, the valve plate bracket 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 towards the flow passage direction 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 is arranged around the valve seat hole, and a first sealing member is provided in the sealing groove.

[0007] Further, the valve plate support includes an annular support body, two mounting holes are oppositely arranged on the support body, a rotating shaft is arranged between the two mounting holes, the valve plate body is sleeved on the rotating shaft, and a bushing is arranged between the rotating shaft and the mounting hole.

[0008] Further, a first mounting step is arranged on the opening, and the support body is arranged on the first mounting step.

[0009] Further, a first limiting boss in an arc shape is arranged on the bottom surface of the support body, and a weight-reducing counterbore for cooperating with the first limiting boss is arranged on the surface of the valve plate body away from the valve seat.

[0010] Further, a second limiting boss is arranged on the bottom surface of the support body, and a positioning groove matching with the second limiting boss is arranged on the first mounting step.

[0011] Further, a valve cover is further included, the valve cover is arranged outside the valve plate assembly, at least part of the valve cover abuts against the valve plate support, and an elastic member is arranged between the valve cover and the valve plate support.

[0012] Further, the valve seat is arranged in the valve body, a third limiting boss is arranged on the inner wall of the valve body, a second mounting step for cooperating with the third limiting boss is arranged at the end of the valve seat, a second sealing member is arranged axially between the inner wall of the valve body and the outer wall of the valve seat, and a third sealing member is arranged radially between the third limiting boss and the second mounting step.

[0013] Further, the first sealing member at least includes an elastic sealing member.

[0014] Further, the sealing groove has a groove opening and a groove bottom, and the width of the groove opening of the sealing groove is smaller than the width of the groove bottom of the sealing groove.

[0015] Further, the sealing groove has two side walls extending from the groove bottom to the groove opening, and both of the two side walls are arranged at an acute angle with the groove bottom.

[0016] Further, the sealing groove has two side walls extending from the groove bottom to the groove opening, and at least one of the two side walls is arranged perpendicular to the groove bottom.

[0017] Further, the first sealing member further includes a retaining ring, and the retaining ring is arranged between the side wall perpendicular to the groove bottom and the elastic sealing member.

[0018] Applying the check valve provided by the present application, by arranging an opening on the side of the valve body and arranging the valve support inside the opening, the installation and maintenance of the valve assembly are facilitated; by arranging at least one sealing groove on the end face of the valve seat facing the valve plate assembly and arranging a first sealing member in the sealing groove, and arranging the sealing member on the end face of the valve seat, facing away from the fluid, the erosion area can be avoided, and the wear of the valve seat during use can be reduced; by arranging the sealing groove and the first sealing member, it is beneficial to improve the sealing effect between the valve seat and the valve plate body, prevent the fracturing sand from entering the gap between the valve plate body and the valve plate support, and thus is beneficial to improving the service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The schematic diagrams of the accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 shows a schematic structural diagram of a check valve according to the present invention;

[0021] Figure 2 shows a cross-sectional view of a check valve according to the present invention;

[0022] Figure 3 shows a cross-sectional view of the air intake part of a check valve according to the present invention;

[0023] Figure 4 shows a cross-sectional view of the air cavity of a check valve according to the present invention;

[0024] Figure 5 shows a top view of a check valve according to the present invention;

[0025] Figure 6 shows a cross-sectional view of the mixed gas cavity of a check valve according to the present invention.

[0026] Among them, the above-mentioned drawings include the following reference numerals:

[0027] 10. Valve body; 11. Flow channel; 12. Opening; 121. First installation step; 13. Third limiting boss; 20. Valve seat; 21. Valve seat hole; 22. Sealing groove; 221. Groove opening; 222. Groove bottom; 23. First sealing member; 231. Elastic sealing member; 232. Retaining ring; 24. Second installation step; 25. Second sealing member; 26. Third sealing member; 30. Valve plate assembly; 31. Valve plate support; 311. Support main body; 312. Installation hole; 313. Rotating shaft; 314. Bushing; 315; First limiting boss; 316. Second limiting boss; 32. Valve plate body; 321. Weight-reducing counterbore; 40. Valve cover; 41. Lifting screw; 42. Avoidance groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0031] In order to solve the problems existing in the prior art that the check valve cannot meet the ultra-high pressure operation pressure, has poor sealing effect, and low service life, the present application provides a check valve.

[0032] As Figures 1 to 6 shown, the present application provides a check valve, as Figure 1As shown in the figure, the check 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 arranged inside the valve body 10. A valve seat hole 21 is penetrated through the valve seat 20, and the valve seat hole 21 communicates with the flow channel 11, so that the fluid entering the check valve can pass through the flow channel 11 and pass through the valve seat hole 21. An opening 12 is arranged on the side surface of the valve body 10. The valve plate assembly 30 includes a valve plate bracket 31. The valve plate bracket 31 is arranged inside the opening 12. A 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 towards the flow channel 11 to close the valve seat hole 21. At least one sealing groove 22 is arranged on the end surface of the valve seat 20 facing the valve plate assembly 30. The sealing groove 22 is arranged around the valve seat hole 21. A first sealing member 23 is arranged in the sealing groove 22, so that the sealing between the valve seat 20 and the valve plate body 32 can be realized through the first sealing member 23.

[0033] Applying the check valve provided by the present application, by arranging an opening 12 on the side surface of the valve body 10 and arranging the valve support inside the opening 12, it is convenient for the installation and maintenance of the valve assembly; by arranging at least one sealing groove 22 on the end surface of the valve seat 20 facing the valve plate assembly 30 and arranging a first sealing member 23 in the sealing groove 22, and arranging the sealing member on the end surface of the valve seat 20, facing away from the fluid, it can avoid the erosion area and reduce the wear of the valve seat 20 during use; by arranging the sealing groove 22 and the first sealing member 23, it is beneficial to improve the sealing effect between the valve seat 20 and the valve plate body 32, and avoid the fracturing sand from entering the gap between the valve plate body 32 and the valve plate bracket 31, so as to be beneficial to improve the service life of the check valve.

[0034] Specifically, as Figure 3 shown, two sealing grooves 22 can be arranged on the end surface of the valve plate assembly 30. Both of the two sealing grooves 22 are arranged around the valve seat hole 21. The two sealing grooves 22 are arranged in a ring shape. A first sealing member 23 is arranged in the sealing groove 22, so as to form a labyrinth sealing structure on the end surface of the valve assembly by arranging the two sealing grooves 22. Such an arrangement is beneficial to further improve the sealing effect, so that the check valve can withstand a higher pressure, such as 175 Mpa pressure, to meet the use under harsh working conditions.

[0035] Furthermore, the first sealing member 23 at least includes an elastic sealing member 231, so that while forming a sealing pair between the valve plate assembly 30 and the valve seat 20, it can also reduce the use and maintenance costs.

[0036] In a specific embodiment of the present application, as Figure 3 、 Figure 4As shown, the sealing groove 22 has a groove opening 221 and a groove bottom 222, and the width of the groove opening 221 of the sealing groove 22 is smaller than the width of the groove bottom 222 of the sealing groove 22; during use, the first sealing member 23 is arranged in the sealing groove 22, and the size of the first sealing member 23 matches the size of the sealing groove 22, so that during the sealing process, the smaller width of the groove opening 221 realizes the clamping of the first sealing member 23. During the assembly process, the first sealing member 23 is installed in the sealing groove 22 and can be directly taken out with the disassembly of the valve assembly, reducing the disassembly difficulty. At the same time, it can also avoid the damage to the sealing member caused by the separate disassembly of the sealing member.

[0037] Specifically, the sealing groove 22 has two side walls extending from the groove bottom 222 to the groove opening 221, and both side walls are arranged at an acute angle with the groove bottom 222, that is, the cross-section of the sealing groove 22 is dovetail-shaped, and the elastic sealing member 231 is an annular sealing member with a circular cross-section. The diameter of the elastic sealing member 231 is smaller than the width of the groove opening 221, so that most of the elastic sealing member 231 is received in the sealing groove 22. Such a setting method is more conducive to improving the service life of the sealing member and reducing the disassembly difficulty of the sealing member.

[0038] In a specific embodiment, as Figure 4 shown, the sealing groove 22 has two side walls extending from the groove bottom 222 to the groove opening 221, and at least one of the two side walls is arranged perpendicular to the groove bottom 222; by setting at least one of the side walls to be perpendicular to the groove bottom 222, it is convenient for the first sealing member 23 to enter the sealing groove 22, which is beneficial to improving the assembly efficiency of the first sealing member 23.

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

[0040] Furthermore, as Figure 5 、 Figure 6 shown, the valve plate bracket 31 includes an annular bracket body 311, two mounting holes 312 are oppositely arranged on the bracket body 311, a rotating shaft 313 is installed between the two mounting holes 312, and 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 arranged between the rotating shaft 313 and the mounting hole 312, so as to avoid the wear between the two sides of the rotating shaft 313 and the mounting hole 312, which is beneficial to extending the service life of the rotating shaft 313.

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

[0042] In a specific embodiment of the present application, the surface of the rotating shaft 313 can also be subjected to surface strengthening treatment, so as to improve 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 the surface hardness and increase the erosion resistance. Among them, the 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 according to the surface bonding force, corrosion resistance, and hardness requirements to perform surface hardening treatment on the valve plate body 32 or the valve seat 20.

[0043] To facilitate the assembly of the components inside the valve body 10, a first installation step 121 is further provided on the opening 12 of the valve body 10. During the installation process, the bracket main body 311 is arranged on the first installation step 121, so as to realize the support and fixation of the bracket main body 311 through the first installation step 121.

[0044] Furthermore, an arc-shaped first limiting boss 315 is provided on the bottom surface of the bracket main body 311, and a weight-reducing counterbore 321 that cooperates with the first limiting boss 315 is arranged on the surface of the valve plate body 32 away from the valve seat 20. Thus, when the valve plate body 32 closes the opening 12, the weight-reducing counterbore 321 can abut against the surface of the first limiting boss 315. By arranging the weight-reducing counterbore 321 on the side of the valve plate body 32 away from the valve seat 20 for weight reduction, the opening angle of the valve plate body 32 can be larger and the opening can be higher under the same flow rate while ensuring the strength, which is beneficial to reducing the erosion of the fluid on the valve plate body 32 and reducing the wear of the valve plate door body. Preferably, a weight-reducing groove can also be arranged on the side of the valve plate body 32 away from the valve seat 20.

[0045] To facilitate the positioning of the bracket main body 311 during the installation process, a second limiting boss 316 is further arranged on the bottom surface of the bracket main body 311, and a positioning groove matching the second limiting boss 316 is arranged on the first installation step 121; during the installation process, by the cooperation of the second limiting boss 316 and the positioning groove, the circumferential movement of the bracket main body 311 can be restricted, avoiding slight rotation or deflection of the bracket main body 311 during the installation of the valve cover 40, which cannot ensure the uniform compression of the end face seal of the valve seat 20 and reduces the service life; such a setting method is beneficial to improving the sealing performance between the valve plate assembly 30 and the valve seat 20.

[0046] As Figure 1As shown, the check valve of the present application further includes a valve cover 40. The valve cover 40 is disposed outside the valve plate assembly 30 and is detachably mounted at the opening 12 on the side of the valve body 10. After installation, at least a part of the valve cover 40 abuts against the valve plate bracket 31, thereby fixing the valve plate bracket 31. An elastic member is provided between the valve cover 40 and the valve plate bracket 31, and the elastic abutment of the valve plate bracket 31 is achieved through the elastic member to avoid the vibration of the valve plate bracket 31 caused by the pulsation of the fluid.

[0047] Specifically, the elastic member can be, for example, a wave spring. During the installation process, the valve cover 40 is screwed in place to deform the wave spring to generate a pre-tightening force, so that the valve plate bracket 31 is closely attached to the valve body 10. Through the setting of the wave spring, the assembly of the valve cover 40 can be facilitated. At the same time, the vibration of the valve plate bracket 31 caused by the passing of pulsating fluid can be further avoided, and the wear of metal mating parts can be reduced.

[0048] Optionally, a lifting eye screw 41 is further installed on the side of the valve cover 40 away from the valve plate bracket 31, which facilitates the transportation of the product and the hoisting during installation. A sealing member is provided between the valve cover 40 and the valve body 10 to prevent impurity particles from entering the thread gap between the valve cover 40 and the valve body 10, ensure the normal fit of the threads, and avoid assembly errors caused by damage to the thread surface.

[0049] Among them, a relief groove 42 is further provided on the side of the valve cover 40 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 and the side wall of the relief groove 42 are transitioned by an arc, and the depth of the relief groove 42 is slightly greater than the thickness of the valve plate body 32, so as to avoid the generation of turbulence or rapids of the fluid in the flow channel 11.

[0050] Preferably, the surface of the flow channel 11 of the valve body 10 is also rounded to eliminate the surface with structural mutations that may appear in the fluid flow area. Such a setting method is beneficial to the smooth flow of the fluid in the flow channel 11 and avoids the turbulence caused by the mechanical structure mutation.

[0051] Furthermore, the valve seat 20 can be integrally formed with the valve body 10 or detachably arranged inside the valve body 10. To facilitate the assembly of the valve seat 20, as shown in the figure, a third limiting boss 13 is provided on the inner wall of the valve body 10, a second installation step 24 cooperating with the third limiting boss 13 is provided at the end of the valve seat 20, a second sealing member 25 is axially arranged between the inner wall of the valve body 10 and the outer wall of the valve seat 20, and a third sealing member 26 is radially arranged between the third limiting boss 13 and the second installation step 24. By providing a second sealing line and the third sealing member 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, avoiding 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] Among them, the setting forms of the second sealing member 25 and the third sealing member 26 are the same as those of the first sealing member 23, and are not described in detail in this application.

[0053] Applying the check valve provided by this application, by providing an opening on the side of the valve body and arranging the valve support inside the opening, the installation and maintenance of the valve assembly are facilitated; by providing at least one sealing groove on the end face of the valve seat facing the valve plate assembly and arranging a first sealing member in the sealing groove, and arranging the sealing member on the end face of the valve seat, facing away from the fluid, the erosion area can be avoided, reducing the wear of the valve seat during use; by providing the sealing groove and the first sealing member, it is beneficial to improve the sealing effect between the valve seat and the valve plate body, avoiding the entry of fracturing sand into the gap between the valve plate body and the valve plate support, so that it can meet the requirements of ultra-high pressure working conditions, effectively solving the technical problems of the existing check valve that cannot meet the ultra-high pressure operation pressure, has poor sealing effect and low service life.

[0054] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

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

[0056] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the scope of protection of the present invention.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A one-way valve, characterized in that: The invention comprises a valve body, a valve seat and a valve plate assembly, wherein the valve body has a flow channel, the valve seat is arranged in the valve body, a valve seat hole is penetrated through the valve seat, the valve seat hole is communicated with the flow channel, an opening is arranged on the side of the valve body, the valve plate assembly comprises a valve plate bracket, the valve plate bracket is arranged on the inner side of the opening, the valve plate bracket is rotatably connected to the valve plate body, 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 arranged on the end surface of the valve seat facing the valve plate assembly, the sealing groove is arranged around the valve seat hole, and a first sealing member is arranged in the sealing groove.

2. The one-flow valve according to claim 1, characterized in that: The valve plate bracket comprises an annular bracket body, two mounting holes are arranged opposite to each other on the bracket body, a rotating shaft is arranged between the two mounting holes, the valve plate body is sleeved on the rotating shaft, and a bushing is arranged between the rotating shaft and the mounting hole.

3. The one-flow valve according to claim 2, characterized in that: A first installation step is arranged on the opening, and the bracket body is arranged on the first installation step.

4. The one-flow valve according to claim 2, characterized in that: A first arc-shaped limiting boss is provided on the bottom surface of the bracket body, and a weight-reducing sink matched with the first limiting boss is provided on the surface of the valve plate body away from the valve seat.

5. The one-flow valve according to claim 3, characterized in that: A second limiting boss is disposed on the bottom surface of the bracket body, and a positioning groove matching the second limiting boss is disposed on the first mounting step.

6. The one-flow valve according to claim 1, characterized in that: It also includes a valve cover, which is arranged on the outside of the valve plate assembly. At least a part of the valve cover abuts against the valve plate bracket, and an elastic member is arranged between the valve cover and the valve plate bracket.

7. The one-flow valve according to claim 1, characterized in that: The valve seat is arranged in the valve body, a third limiting boss is arranged on the inner wall of the valve body, a second installation step matching the third limiting boss is arranged at the end of the valve seat, a second sealing member is axially arranged between the inner wall of the valve body and the outer wall of the valve seat, and a third sealing member is radially arranged between the third limiting boss and the second installation step.

8. The one-flow valve according to claim 1, characterized in that: The first sealing member includes at least an elastic sealing member.

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

10. The one-flow valve according to claim 9, characterized in that: The sealing groove has two side walls extending from the groove bottom to the groove opening, and the two side walls are arranged at an acute angle with the groove bottom.

11. The one-flow valve according to claim 9, characterized in that: The sealing groove has two side walls extending from the groove bottom to the groove opening, and at least one of the two side walls is vertically arranged relative to the groove bottom.

12. The one-flow valve according to claim 11, characterized in that: The first sealing member further comprises a retaining ring, which is arranged between the side wall arranged perpendicular to the groove bottom and the elastic sealing member.

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