Swing type check valve

Abstract

A swing type check valve, comprising a valve body (11), a bonnet (12), a disc (13), a rocker arm (14), a detection mechanism (3) and an adapter mechanism (2); the rocker arm (14) is adapted to be rotatably connected to a valve, the disc (13) is fixedly connected to the end of the rocker arm (14) away from the center of rotation thereof, and the detection mechanism (3) is arranged on the outer side of the valve body (11). One side of the adapter mechanism (2) is rotatably connected to the rocker arm (14), and the other side of the adapter mechanism (2) passes through the bonnet (12) and extends towards a detection end of the detection mechanism (3). The adapter mechanism (2) is configured to move towards or away from the detection end of the detection mechanism (3) during the rotating stroke of the rocker arm (14). Arranging the detection part of the check valve outside the valve allows for flexible real-time monitoring of the opening and closing position states of the disc, thereby achieving rapid response, good safety and stable and reliable monitoring capability, and being suitable for remotely controlling and acquiring the opening and closing positions of the valve.

Description

A swing check valve

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on February 22, 2024, with application number 202410198172.8 and invention name “A Swing Check Valve”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of valves, and in particular to a swing check valve. Background Art

[0004] Swing check valves primarily function in pipelines to allow or block the flow of media. Typically, the initial position, key positions, and even the valve's full open / close position during the opening and closing process cannot be directly acquired. Current methods involve indirectly acquiring the valve's open / close status by adding new equipment, such as flow meters and pressure gauges, to the valve's front or back end, or within the pipeline system. Critical core areas, such as nuclear power plants, typically experience high radiation doses, temperatures, and pressures that exceed safety limits, such as the human body's physiological tolerance. In these situations, on-site operation of the corresponding valve equipment is no longer feasible. Currently, magnetic pole response methods are used to acquire the valve's open / close position, but these methods are subject to electromagnetic interference, and their accuracy relies on specific design algorithms, making data reliability difficult to guarantee. Therefore, new methods and structures are urgently needed to meet these requirements.

[0005] Summary of the Invention

[0006] The technical problem that the present application aims to solve or at least partially solve is that in the related art, the monitoring valve's opening and closing position status is limited, and the magnetic pole response scheme has electromagnetic interference, which reduces the monitoring reliability and makes it difficult to meet the use requirements.

[0007] The present application provides a swing check valve, comprising a valve body, a valve cover, and a valve disc, wherein the valve body and the valve cover are detachably configured, the valve disc is disposed within the valve body, and the valve disc is used to close or open a flow passage of the valve body, and the swing check valve further comprises:

[0008] A rocker adapted to be connected to the valve body for relative rotation, wherein the valve disc is fixedly connected to an end of the rocker away from the rotation center thereof;

[0009] A detection mechanism is arranged outside the valve body;

[0010] And a transfer mechanism, one side of which is connected to the rocker for rotation, and the other side of which extends through the valve cover and is arranged toward the detection end of the detection mechanism; the transfer mechanism is configured to move toward or away from the detection end of the detection mechanism during the rotation stroke of the rocker.

[0011] Optionally, the transfer mechanism includes a connecting block and a moving rod, the connecting block is connected to the rocker, the connecting block is arranged in the direction from the rotation center of the rocker to the valve disc, the moving rod is configured to rotate with the rocker through the connecting block, one end of the moving rod is connected to the connecting block, and the other end of the moving rod extends through the valve cover, and the moving rod and the valve cover are configured to slide and seal.

[0012] Optionally, the switching mechanism further includes a trigger member connected to an end of the moving rod away from the rocker arm, and the detection end of the detection mechanism is suitable for detecting the displacement of the trigger member.

[0013] Optionally, the detection mechanism includes a first detection member, a second detection member and a bracket, the first detection member and the second detection member are fixed on the bracket at intervals, the bracket and the valve cover are fixed, the first detection member and the second detection member are arranged in the displacement direction of the trigger member, and any detection member is suitable for responding to the triggering of the trigger member to generate feedback detection data.

[0014] Optionally, the valve cover is provided with a through-hole structure for the moving rod to pass through, and at least part of the through-hole structure is provided with a sealing assembly, and the sealing assembly is used to seal and close the gap space between the moving rod and the valve cover.

[0015] Optionally, the sealing assembly includes a packing sealing structure, a pressing sleeve, and a pressing plate, wherein the packing sealing structure is pressed between the through-hole structure and the movable rod, the pressing sleeve is pressed on the packing sealing structure, the pressing plate is fixed to the valve cover, and the pressing plate is arranged in contact with a side of the pressing sleeve away from the packing sealing structure;

[0016] The through hole structure includes an intermediate stuffing box and a limiting hole structure. The intermediate stuffing box and the limiting hole structure are connected and arranged. The limiting hole structure is suitable for slidingly guiding the moving rod to move linearly along the extension axis of the limiting hole structure.

[0017] Optionally, the swing check valve further includes a support and a connecting shaft, the support is mounted in the valve body, the connecting shaft is rotatably mounted on the support, and the rocker is arranged to rotate relative to the valve body through the connecting shaft.

[0018] Optionally, the swing check valve further comprises a positioning assembly, the positioning assembly being used to fix the support within the valve body; the positioning assembly comprises a limiting ring, a fastener and an anti-loosening ring, the limiting ring and the valve body are configured for limiting engagement, one end of the fastener is fixedly connected to the limiting ring, the other end of the fastener is fixedly connected to the support, and the anti-loosening ring is limitedly installed on the support; and / or

[0019] The rocker is provided with a connecting hole, and the rocker is sleeved on the connecting shaft through the connecting hole.

[0020] Optionally, the swing check valve further includes a seat ring, which is fixedly disposed in the valve body. The seat ring is provided with a check port communicating with the flow channel, and the valve disc is used for conformally sealing the check port.

[0021] Optionally, the swing check valve further comprises a first fixing assembly, the first fixing assembly being used for detachably connecting the rocker and the valve disc; and / or

[0022] The swing check valve further includes a second fixing assembly, which is used for detachably connecting the valve body and the valve cover.

[0023] The technical solution provided by this application has the following advantages:

[0024] The swing check valve provided by the present application includes a valve body, a valve cover, a valve disc, a rocker, a detection mechanism, and a switching mechanism; the rocker is suitable for relative rotation connection to the valve body, and the valve disc is fixedly connected to the end of the rocker away from its rotation center; the detection mechanism is arranged on the outside of the valve body; one side of the switching mechanism is connected to the rocker for rotation, and the other side of the switching mechanism extends through the valve cover and is arranged toward the detection end of the detection mechanism; the switching mechanism is configured to move toward or away from the detection end of the detection mechanism during the rotation stroke of the rocker. The detection part of the present application is external to the valve body, and can flexibly monitor the open and closed position status of the valve disc in real time. It has a rapid response, good safety, and stable and reliable monitoring capability, and can be used for remote control to obtain the open and closed position of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] FIG1 is a schematic cross-sectional view of a swing check valve provided by the present application in the main viewing direction;

[0027] FIG2 is a schematic cross-sectional view of a swing check valve provided by the present application as viewed from the side;

[0028] FIG3 is a schematic diagram of a partial structure of a swing check valve provided in the present application;

[0029] FIG4 is a schematic structural diagram of a rocker in a swing check valve provided in the present application;

[0030] Explanation of the accompanying drawings: 11-valve body; 12-valve cover; 13-valve disc; 14-rocker; 141-connecting hole; 142-mounting hole; 15-support; 16-connecting shaft; 17-seat ring; 2-transfer mechanism: 21-connecting block; 22-moving rod; 23-trigger; 3-detection mechanism; 31-first detection member; 32-second detection member; 33-bracket; 41-packing sealing structure; 42-pressing sleeve; 43-pressure plate; 51-limiting ring; 52-fastener; 53-anti-loosening ring; 6-first fixing component; 7-second fixing component. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0032] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0034] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0035] Example 1

[0036] This embodiment provides a swing check valve, as shown in Figures 1 to 4, the swing check valve includes a valve body 11, a valve cover 12 and a valve flap 13. The valve body 11 and the valve cover 12 are detachable. The valve flap 13 is arranged in the valve body 11, and the valve flap 13 is used to close or open the flow channel of the valve body 11.

[0037] 1 and 2 , the swing check valve further comprises a rocker 14, a detection mechanism 3 and a switching mechanism 2; the rocker 14 is adapted to be connected to the valve body 11 for relative rotation, and the valve flap 13 is fixedly connected to one end of the rocker 14 away from its rotation center; the detection mechanism 3 is arranged on the outside of the valve body 11; one side of the switching mechanism 2 is rotationally connected to the rocker 14, and the other side of the switching mechanism 2 extends through the valve cover 12 and is arranged toward the detection end of the detection mechanism 3; the switching mechanism 2 is configured to move toward or away from the detection end of the detection mechanism 3 during the rotation stroke of the rocker 14.

[0038] In this embodiment, the transfer mechanism 2 includes a connecting block 21 and a moving rod 22. Referring to Figures 1 and 2, the connecting block 21 is connected to the rocker 14. The connecting block 21 is arranged in the direction from the rotation center of the rocker 14 to the valve disc 13. The moving rod 22 is configured to rotate with the rocker 14 through the connecting block 21. One end of the moving rod 22 is connected to the connecting block 21, and the other end of the moving rod 22 extends through the valve cover 12. The moving rod 22 and the valve cover 12 are configured to slide and seal.

[0039] 2 , the switching mechanism 2 further includes a trigger member 23 . The trigger member 23 is connected to an end of the moving rod 22 away from the rocker 14 . The detection end of the detection mechanism 3 is adapted to detect the displacement of the trigger member 23 .

[0040] 2 , the detection mechanism 3 includes a first detection member 31, a second detection member 32 and a bracket 33. The first detection member 31 and the second detection member 32 are fixed on the bracket 33 at intervals, and the bracket 33 and the valve cover 12 are fixedly arranged. The first detection member 31 and the second detection member 32 are arranged in the displacement direction of the trigger member 23. Any detection member is suitable for responding to the triggering of the trigger member 23 to generate feedback detection data.

[0041] The swing check valve provided in this embodiment rotates according to the medium pressure through the valve disc 13 and the rocker 14. When the medium pressure is greater than the opening pressure of the swing check valve, the valve disc 13 and the rocker 14 rotate and swing upward synchronously. When the medium pressure is less than the opening pressure of the swing check valve, the valve disc 13 and the rocker 14 rotate and swing downward synchronously. At the same time, the rocker 14 drives the moving rod 22 to slide back and forth accordingly. During the reciprocating motion of the moving rod 22, it drives the trigger member 23, triggering the response of the first detection member 31 and the second detection member 32, so as to achieve the purpose of monitoring the position of the valve disc 13.

[0042] In a specific embodiment, referring to FIG2 , the first detection member 31 and the second detection member 32 are configured as contact detectors, and a rocker arm is provided on any detection member, and the rocker arm is used to contact the trigger member 23 to generate a trigger action, thereby feeding back detection data.

[0043] In this embodiment, the first detection member 31 is configured as a closed position detection member of the valve flap 13 to detect the closed position of the valve flap 13, and the second detection member 32 is configured as a maximum open position detection member of the valve flap 13 to detect the maximum open position of the valve flap 13.

[0044] As a variation, the detection mechanism 3 also includes a third detection component, which is used to detect the half-open position of the valve flap 13; of course, other detection components can also be provided to correspond to the different open positions of the valve flap 13 to improve the reliable monitoring of different flow rates in the swing check valve.

[0045] The swing check valve provided in this embodiment has a detection part external to the valve body 11, which can flexibly monitor the opening and closing position status of the valve disc 13 in real time. It responds quickly and has stable and reliable monitoring capabilities, and can be used for remote control to obtain the opening and closing position of the valve.

[0046] In this embodiment, the valve cover 12 is provided with a through-hole structure for the moving rod 22 to pass through, and at least part of the through-hole structure is provided with a sealing assembly for sealing the gap space between the moving rod 22 and the valve cover 12 .

[0047] Referring to Figure 2, the sealing assembly includes a packing sealing structure 41, a pressing sleeve 42 and a pressure plate 43. The packing sealing structure 41 is crimped between the through-hole structure and the moving rod 22, the pressing sleeve 42 is crimped on the packing sealing structure 41, the pressure plate 43 is fixed to the valve cover 12, and the pressure plate 43 is abutted against the side of the pressing sleeve 42 away from the packing sealing structure 41.

[0048] In one embodiment, the through-hole structure includes an intermediate stuffing box and a limiting hole structure, which are connected to each other, wherein the limiting hole structure is suitable for slidingly guiding the moving rod 22 to move linearly along the extension axis of the limiting hole structure.

[0049] During the assembly of the adapter mechanism 2, the moving rod 22 is passed through the through-hole structure of the valve cover 12, the packing seal assembly is installed in the middle stuffing box of the valve cover 12, and the pressing sleeve 42 and the pressing plate 43 are sequentially passed through the moving rod 22 and placed on the upper portion of the packing seal assembly. The packing seal assembly, the pressing sleeve 42, and the pressing plate 43 are then fastened to the valve cover 12 using fasteners and pressed firmly. The displacement of the moving rod 22 can be sealed by the sliding movement of the sealing assembly to prevent leakage of the internal medium to the external environment. The moving rod 22 can be driven to slide freely in the through-hole structure of the valve cover 12 by the rotation of the rocker 14.

[0050] In one embodiment, the contact portion between the moving rod 22 and the through-hole structure is configured as a cylindrical structure, and the limiting hole structure and the cylindrical structure are configured to slide with each other. Through the guiding effect of the limiting hole structure, the displacement stroke of the moving rod 22 can be configured as a linear motion along the extension axis direction of the limiting hole structure.

[0051] 1 , the swing check valve further includes a support 15 and a connecting shaft 16 . The support 15 is mounted in the valve body 11 , the connecting shaft 16 is rotatably mounted on the support 15 , and the rocker 14 is arranged to rotate relative to the valve body 11 via the connecting shaft 16 .

[0052] When the swing check valve flows through the medium fluid, see Figure 1, the medium fluid flows into the flow channel from left to right. When the medium force of the medium fluid is greater than the opening pressure of the valve disc 13, the medium force acts on the valve disc 13 and the rocker 14 to synchronously swing around the connecting shaft 16.

[0053] In a specific embodiment, referring to Figures 1 and 4 , the rocker 14 is provided with a connecting hole 141, through which the rocker 14 is sleeved onto the connecting shaft 16. A connecting block 21 is inserted into the connecting hole 141 in the middle of the rocker 14. One end of a movable rod 22 is rotatably connected to the connecting block 21. The connecting block 21 is fixedly connected to the rocker 14, allowing the movable rod 22 to freely rotate around the rocker 14 via the connecting block 21.

[0054] In some embodiments, the connecting block 21 is rotatably connected to the rocking arm 14, and the mobile rod 22 is fixedly connected to the connecting block 21, so that the mobile rod 22 can freely rotate around the rocking arm 14 through the connecting block 21. In another embodiment, the connecting block 21 is rotatably connected to the rocking arm 14, and the mobile rod 22 is rotatably connected to the connecting block 21, so that the mobile rod 22 can freely rotate around the rocking arm 14 through the connecting block 21.

[0055] In one embodiment, referring to Figures 1 and 4 , a mounting hole 142 is provided on the rocker 14 , and the mounting hole 142 is disposed between the connecting hole 141 and the valve disc 13 . The mounting hole 142 is used to assemble the connecting block 21 .

[0056] In one embodiment, referring to FIG. 1 and FIG. 4 , in order to facilitate compact layout and the opening and closing stroke of the valve flap 13 , the rocker 14 is configured as a bent structure.

[0057] As a further embodiment, the swing check valve also includes a positioning assembly, which is used to fix the support 15 in the valve body 11; the positioning assembly is suitable for strengthening the connection strength between the support 15 and the valve body 11; in a specific embodiment, referring to Figures 1 and 3, the positioning assembly includes a limit ring 51, a fastener 52 and an anti-loosening ring 53, the limit ring 51 and the valve body 11 are configured for limiting and clamping, one end of the fastener 52 is fixedly connected to the limit ring 51, and the other end of the fastener 52 is fixedly connected to the support 15, and the fastener 52 is suitable for causing the limit ring 51 and the support 15 to be pressed into contact; the anti-loosening ring 53 is installed on the support 15 for limiting.

[0058] In a specific embodiment, the anti-loosening ring 53 has pre-formed elastic force and acts radially to make the support 15 and the valve body 11 contact each other, thereby improving the connection strength between the support 15 and the valve body 11 and promoting reliable detection of the valve opening and closing state.

[0059] In one embodiment, the retaining ring 51 is configured as a four-ring structure to facilitate assembly within the valve body 11. Accordingly, four fasteners 52 are provided. When the four-ring structure is installed within the upper chamber of the valve body 11, the four-ring structure and the valve body 11 can be mutually embedded and positioned via the stepped groove. The fasteners 52 then lock the retaining ring 51 and the support 15, securing the two together.

[0060] Referring to Figure 1 , the swing check valve also includes a seat ring 17, which is fixedly mounted within the valve body 11. The seat ring 17 is provided with a check port communicating with the flow passage, and the valve disc 13 conformably seals the check port. In one embodiment, the valve body 11 is provided with a seat ring aperture, to which the seat ring 17 can be welded.

[0061] In this embodiment, the swing check valve further includes a first fixing assembly 6 for assembling the rocker 14 and valve disc 13. See FIG1 . The first fixing assembly 6 is used to detachably connect the rocker 14 and valve disc 13. In one specific embodiment, the first fixing assembly 6 comprises a nut, a washer, and a fixing pin. The valve disc 13 has a protruding assembly shaft. By installing the rocker 14 and washer onto the assembly shaft of the valve disc 13, tightening the rocker 14, washer, and valve disc 13 with the nut, and then installing the fixing pin into the hole in the nut to secure the connection, the first fixing assembly 6 provides excellent mechanical anti-loosening capabilities, ensuring a tight connection between the valve disc 13 and the rocker 14, and ensuring reliable opening and closing of the valve disc 13.

[0062] In this embodiment, referring to Figures 1 and 2, the swing check valve further includes a second fixing assembly 7, which is used to detachably connect the valve body 11 and the valve cover 12. The second fixing assembly 7 includes a spiral wound gasket, a washer, a stud, and a nut. The spiral wound gasket is disposed on the side of the valve cover 12 facing the valve body 11. The gasket, stud, and nut cooperate to connect the valve cover 12 and the valve body 11 and are tightened and fixed with a predetermined torque to effectively press the spiral wound gasket between the valve cover 12 and the valve body 11.

[0063] The swing check valve provided by the present application, when the swing check valve is opened by the fluid medium (see Figure 1), the fluid medium flows from left to right through the valve body 11. Under the action of fluid pressure and flow, the valve disc 13 is pushed to separate from the seat ring 17 to open the check port. The fluid medium then passes through the valve body 11 via the right outlet of the valve body 11, completing the entire valve opening. During the process of the valve disc 13 opening, the rocker 14 is driven to perform a partial rotational motion around the axis of the connecting shaft 16, i.e., a swing motion. During its swing stroke, the rocker 14 drives the movable rod 22 to rotate. The limit guide of the movable rod 22 by the valve cover 12 can convert the rotational motion of the movable rod 22 into linear motion. During the linear motion of the movable rod 22, the triggering member 23 at the end of the movable rod 22 completes the approach and separation triggering with the corresponding detection member, thereby completing the closed-loop process of triggering, disengaging, and re-triggering of the entire detection action, and then transmitting the detection data, ultimately achieving the transmission of the valve disc 13 movement to the open position inside the valve. When a fluid medium with a small flow rate and low medium pressure flows through the swing check valve, it is in a closed state. Its closing process is the reverse process of its opening, which will not be repeated here.

[0064] The swing check valve provided by this application opens and closes the valve disc 13 as the medium fluid flows through the entire valve. Simultaneously, the valve's opening and closing position status is fed back locally or through actual detection data to an external control room, enabling identification and reading of the valve's opening and closing status. Its simple structure allows for arbitrary arrangement based on on-site control requirements, enabling remote operational control. Furthermore, personnel are safer throughout the entire operation process, minimizing environmental influences, further enhancing human-machine protection, and further improving safety and reliability, thereby ensuring the safe operation of the entire system.

[0065] This application can flexibly obtain the position of the valve disc 13 and respond promptly, solving the problem of limited monitoring of the valve's opening and closing position. This application provides a swing check valve with multiple advantages, including the ability to read the valve's opening and closing position locally, remotely control and read, safer detection data transmission, strong safety and reliability, and in-depth protection for humans and machines. The use of this valve is conducive to reducing equipment operation and maintenance costs, the risk of failure, and the safe utilization rate of equipment, and can protect the safety of nuclear power plants for non-active valves.

Claims

1. A swing check valve, comprising a valve body (11), a valve cover (12) and a valve flap (13), wherein the valve body (11) and the valve cover (12) are detachably configured, the valve flap (13) being arranged in the valve body (11), and the valve flap (13) being used to close or open a flow passage of the valve body (11), characterized in that: The swing check valve further comprises: A rocker (14) is adapted to be relatively rotatably connected to the valve body (11), and the valve flap (13) is fixedly connected to an end of the rocker (14) away from its rotation center; A detection mechanism (3) is arranged outside the valve body (11); and a transfer mechanism (2), one side of the transfer mechanism (2) being rotatably connected to the rocker (14), and the other side of the transfer mechanism (2) extending through the valve cover (12) toward the detection end of the detection mechanism (3); the transfer mechanism (2) being configured to move toward or away from the detection end of the detection mechanism (3) during the rotational stroke of the rocker (14).

2. The swing check valve according to claim 1, characterized in that: The transfer mechanism (2) includes a connecting block (21) and a moving rod (22), wherein the connecting block (21) is connected to the rocking arm (14), and the connecting block (21) is arranged in a direction from the rotation center of the rocking arm (14) to the valve flap (13). The moving rod (22) is configured to rotate with the rocking arm (14) through the connecting block (21), one end of the moving rod (22) is connected to the connecting block (21), and the other end of the moving rod (22) extends through the valve cover (12), and the moving rod (22) and the valve cover (12) are configured to slide and seal.

3. The swing check valve according to claim 2, characterized in that: The switching mechanism (2) further comprises a trigger member (23), the trigger member (23) being connected to an end of the moving rod (22) away from the rocker (14), and the detection end of the detection mechanism (3) being adapted to detect the displacement of the trigger member (23).

4. The swing check valve according to claim 3, characterized in that: The detection mechanism (3) comprises a first detection member (31), a second detection member (32) and a bracket (33); the first detection member (31) and the second detection member (32) are fixed on the bracket (33) at intervals, the bracket (33) and the valve cover (12) are fixedly arranged, the first detection member (31) and the second detection member (32) are arranged in the displacement direction of the trigger member (23), and any detection member is suitable for responding to the triggering of the trigger member (23) to generate feedback detection data.

5. The swing check valve according to claim 2, characterized in that: The valve cover (12) is provided with a through-hole structure for the moving rod (22) to pass through, and at least part of the through-hole structure is provided with a sealing component, and the sealing component is used to seal the gap space between the moving rod (22) and the valve cover (12).

6. The swing check valve according to claim 5, characterized in that: The sealing assembly comprises a packing sealing structure (41), a pressing sleeve (42) and a pressing plate (43); the packing sealing structure (41) is pressed between the through-hole structure and the moving rod (22); the pressing sleeve (42) is pressed on the packing sealing structure (41); the pressing plate (43) and the valve cover (12) are fixed; and the pressing plate (43) is arranged in contact with a side of the pressing sleeve (42) away from the packing sealing structure (41); The through hole structure comprises an intermediate stuffing box and a limiting hole structure, wherein the intermediate stuffing box and the limiting hole structure are connected and arranged, and the limiting hole structure is suitable for slidingly guiding the moving rod (22) to perform linear motion along the extension axis of the limiting hole structure.

7. The swing check valve according to claim 2, characterized in that: The swing check valve further comprises a support (15) and a connecting shaft (16), wherein the support (15) is mounted in the valve body (11), the connecting shaft (16) is rotatably mounted on the support (15), and the rocker (14) is arranged to rotate relative to the valve body (11) via the connecting shaft (16).

8. The swing check valve according to claim 7, characterized in that: The swing check valve further comprises a positioning assembly, the positioning assembly being used to fix the support (15) in the valve body (11); the positioning assembly comprises a limiting ring (51), a fastener (52) and an anti-loosening ring (53); the limiting ring (51) and the valve body (11) are configured to be position-limited and clamped; one end of the fastener (52) is fixedly connected to the limiting ring (51), and the other end of the fastener (52) is fixedly connected to the support (15); the anti-loosening ring (53) is position-limited and mounted on the support (15); and / or The rocker (14) is provided with a connecting hole (141), and the rocker (14) is sleeved on the connecting shaft (16) through the connecting hole (141).

9. The swing check valve according to any one of claims 1 to 8, characterized in that: The swing check valve further comprises a seat ring (17), wherein the seat ring (17) is fixedly arranged in the valve body (11), and the seat ring (17) is provided with a check port communicating with the flow channel, and the valve flap (13) is used for conformally sealing the check port.

10. The swing check valve according to any one of claims 1 to 8, characterized in that: The swing check valve further comprises a first fixing assembly (6), the first fixing assembly (6) being used for detachably connecting the rocker (14) and the valve disc (13); and / or The swing check valve further comprises a second fixing assembly (7), wherein the second fixing assembly (7) is used for detachably connecting the valve body (11) and the valve cover (12).

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