Swing check valve

Abstract

The invention provides a swing check valve which comprises a valve body, a valve plate, a shaft core and an adjuster, a flow channel is formed in the valve body, a mounting hole is formed in the valve body, the valve plate is rotatably arranged on the valve body and used for opening and closing the flow channel, the shaft core is arranged in the mounting hole and connected with the valve plate, the adjuster is detachably connected with the shaft core, and the valve plate is rotatably arranged on the valve body and used for opening and closing the flow channel. The opening degree of the valve plate can be adjusted through the shaft core. According to the swing check valve disclosed by the embodiment of the invention, the mounting hole is formed in the valve body, the shaft core connected with the valve plate is arranged in the mounting hole, and the detachable regulator is matched, so that the function of manually regulating the opening degree of the valve plate is realized. According to the structure, on the basis that the automatic opening and closing function of the check valve is reserved, the manual operation function is added, the state of the valve plate can be conveniently controlled under the overhauling, debugging or abnormal conditions, the problems of medium leakage and the like caused by the fact that the valve plate cannot be positioned in the opening or closing state are solved, and therefore the flexibility of the swing check valve is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of check valve, in particular to a swing check valve. BACKGROUND

[0002] In the field of fluid transportation, check valve is a key component to ensure the unidirectional flow of fluid, and is widely used in various pipeline systems.

[0003] In the related art, the check valve can only passively respond to the change of fluid pressure, and cannot be flexibly adjusted in the open or closed state by manual operation according to actual needs. In actual operation, this structure has obvious limitations: when the pipeline is overhauled, debugged or abnormal working conditions occur, the valve disc cannot be forcibly locked in the open or closed state by manual means, which may lead to accidents such as medium leakage and equipment damage. SUMMARY

[0004] The present application provides a swing check valve to solve the problem that the check valve cannot be manually adjusted in the prior art, and to achieve flexible adjustment of the opening degree of the check valve.

[0005] The present application provides a swing check valve, comprising: a valve body having a flow passage therein and an installation hole formed thereon; a valve disc rotatably arranged in the valve body for opening and closing the flow passage; a shaft core arranged in the installation hole and connected to the valve disc; an adjuster detachably connected to the shaft core to adjust the opening degree of the valve disc through the shaft core.

[0006] In some embodiments, the valve disc is rotatably arranged in the middle section of the installation hole, the valve disc is provided with a core hole, the inner peripheral wall of the core hole is provided with a first limiting groove, the shaft core is arranged in the core hole, and the outer peripheral wall of the shaft core is provided with a first limiting block; wherein the shaft core is movable along the axial direction of the installation hole, and the shaft core has a linkage position and a release position; at the linkage position, the first limiting block is matched with the first limiting groove to realize synchronous rotation of the shaft core and the valve disc; at the release position, the first limiting block is separated from the first limiting groove to allow relative rotation of the shaft core and the valve disc.

[0007] In some embodiments, the shaft core includes a second limiting block, and the second limiting block is arranged opposite to the first limiting block in the radial direction of the shaft core; a first sliding groove and a second sliding groove extending along the axial direction of the installation hole are arranged in the head section of the installation hole; at the release position, the first limiting block is matched with the first sliding groove, and the second limiting block is matched with the second sliding groove.

[0008] In some embodiments, the swing check valve comprises: a reset member arranged at the tail section of the mounting hole, and having an acting force to move the shaft core towards the head section.

[0009] In some embodiments, the mounting hole is arranged with: a ring groove arranged between the head section and the middle section, and the second limit block is rotatable in the ring groove at the linkage position.

[0010] In some embodiments, the regulator comprises: a lock head arranged with a locking block at the outer circumferential side thereof; a cross-shaped insertion block matched with the cross-shaped groove on the shaft core.

[0011] In some embodiments, the mounting hole comprises: a hole opening formed at the head section; a locking groove arranged at the inner circumferential wall of the head section, and extending along the circumference of the mounting hole, the locking block being arranged in the locking groove at the linkage position, the locking groove having oppositely arranged outer side surface and inner side surface; a closing opening and an opening opening arranged at the end surface of the hole opening, and both penetrating the outer side surface to communicate with the locking groove, a closing hole and an opening hole being arranged at the inner side surface, the closing hole corresponding to the closing opening, and the opening hole corresponding to the opening opening; the swing check valve comprises a locking screw, the locking block is arranged with a locking hole, the locking screw is arranged through the locking hole, and selectively matched with the opening hole or the closing hole.

[0012] In some embodiments, the swing check valve comprises a plug, which is detachably arranged in the mounting hole.

[0013] In some embodiments, the valve plate comprises: a rotating shaft rotatably arranged in the middle section, and the core hole is formed in the rotating shaft; a valve cover for opening and closing the flow passage; a rocker arm for connecting the valve cover and the rotating shaft.

[0014] In some embodiments, in the axial direction of the mounting hole, the size of the ring groove is greater than the size of the second limit block.

[0015] The swing check valve of the embodiment of the present application is provided with a mounting hole on the valve body, and a shaft core connected with the valve disc is arranged in the mounting hole, and a detachable regulator is matched to realize manual adjustment of the opening of the valve disc. The structure retains the automatic opening and closing function of the check valve, and adds manual operation function, which facilitates control of the valve disc state during maintenance, debugging or abnormal conditions, avoids problems such as medium leakage caused by the valve disc unable to be positioned in the open or closed state, and improves the flexibility of the swing check valve. Moreover, the regulator is connected in a detachable manner, does not affect the normal sealing and operation of the swing check valve, has simple structure and convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0017] Figure 1 is a structure schematic view of the shaft core of the swing check valve provided by the present application in the release position.

[0018] Figure 2 is a structure schematic view of the shaft core of the swing check valve provided by the present application in the linkage position.

[0019] Figure 3 is a cross-sectional structure schematic view of the swing check valve provided by the present application, in which the shaft core is removed.

[0020] Figure 4 is a structure schematic view of the regulator and the shaft core of the swing check valve provided by the present application.

[0021] Figure 5 is one of the shaft side schematic views of the swing check valve provided by the present application.

[0022] Figure 6 is a structure schematic view of the hole opening of the mounting hole of the swing check valve provided by the present application.

[0023] Figure 7 is a structure schematic view of the valve disc of the swing check valve provided by the present application.

[0024] Figure 8 is the second shaft side schematic view of the swing check valve provided by the present application.

[0025] Reference signs: 100, swing check valve; 1, valve body; 11, flow passage; 12, mounting hole; 13, first sliding groove; 14, second sliding groove; 15, ring groove; 16, locking groove; 17, opening; 171, opening hole; 18, closing; 181, closing hole; 2, valve piece; 21, core hole; 22, first limiting groove; 23, rotating shaft; 24, valve cover; 25, rocker arm; 3, shaft core; 31, first limiting block; 32, second limiting block; 33, cross groove; 4, regulator; 41, lock head; 42, locking block; 43, cross insertion block; 5, reset member; 6, plug; 7, top cover. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] As shown in the drawings, Figures 1 to 8 The swing check valve 100 of the embodiment of the present application comprises a valve body 1, a valve piece 2, a shaft core 3 and a regulator 4. The valve body 1 has a flow passage 11 therein, and a mounting hole 12 is provided on the valve body 1. The valve piece 2 is rotatably arranged in the valve body 1, and is used to open and close the flow passage 11. The shaft core 3 is arranged in the mounting hole 12 and is connected with the valve piece 2. The regulator 4 is detachably connected with the shaft core 3, so as to adjust the opening of the valve piece 2 through the shaft core 3.

[0028] The valve body 1 is provided with the flow passage 11 for fluid to pass through, and the mounting hole 12 is provided on the valve body 1. The extension direction of the mounting hole 12 is consistent with the rotation axis of the valve piece 2. The mounting hole 12 comprises a head section, a middle section and a tail section arranged in sequence in the axial direction.

[0029] The valve piece 2 is rotatably arranged in the valve body 1, and is used to control the opening and closing of the flow passage 11. The shaft core 3 is arranged in the mounting hole 12 of the valve body 1, and is connected with the valve piece 2. The operator can drive the valve piece 2 to move synchronously by controlling the rotation of the shaft core 3. The regulator 4 is of a detachable structure, and is connected with the shaft core 3 when in use. The operator can exert a rotating force on the shaft core 3 through the regulator 4, so as to adjust the opening of the valve piece 2. When not in use, the regulator 4 is removed.

[0030] In the normal operating state, the valve plate 2 automatically opens or closes the flow channel 11 according to the fluid pressure to realize the check function. When manual intervention is needed, the adjuster 4 is installed on the shaft core 3, the shaft core 3 is driven to rotate by rotating the adjuster 4, and then the valve plate 2 is driven to rotate to realize manual adjustment of the opening degree. After the adjustment is completed, the adjuster 4 can be removed from the shaft core 3, and the valve returns to the normal operating state. In the maintenance or special working conditions, the valve plate 2 can also be kept in the fully open or fully closed position by using the structure to meet the operation requirements.

[0031] In the related art, the check valve can only passively respond to the change of the fluid pressure, and cannot be flexibly adjusted in the on-off state by manual operation according to the actual demand. In actual operation, this structure has obvious limitations: when the pipeline is maintained, debugged or abnormal working conditions occur, the valve plate cannot be forcibly locked in the open or closed state by manual means, which easily leads to medium leakage, equipment damage and other accidents.

[0032] The swing check valve 100 of the embodiment of the application realizes manual adjustment of the opening degree of the valve plate 2 by providing the mounting hole 12 on the valve body 1 and configuring the shaft core 3 connected with the valve plate 2 in the mounting hole 12, and cooperating with the detachable adjuster 4. The structure retains the automatic opening and closing function of the check valve, and increases the manual operation function, which is convenient for controlling the state of the valve plate 2 in maintenance, debugging or abnormal conditions, avoids the problem of medium leakage caused by the valve plate 2 being unable to be positioned in the open or closed state, and improves the flexibility of the swing check valve 100. Moreover, the adjuster 4 is connected in a detachable manner, which does not affect the normal sealing and operation of the swing check valve 100, and the structure is simple and convenient to operate.

[0033] In some embodiments, the valve plate 2 is rotatably arranged in the middle section of the mounting hole 12, the valve plate 2 is provided with a core hole 21, an inner peripheral wall of the core hole 21 is provided with a first limiting groove 22, the shaft core 3 is arranged in the core hole 21, and an outer peripheral wall of the shaft core 3 is provided with a first limiting block 31.

[0034] The shaft core 3 has a linkage position and a release position. In the linkage position, the first limiting block 31 cooperates with the first limiting groove 22, so that the shaft core 3 and the valve plate 2 are synchronously rotated.

[0035] In the release position, the first limiting block 31 is separated from the first limiting groove 22, so that the shaft core 3 and the valve plate 2 can be relatively rotated.

[0036] In this embodiment, the valve plate 2 is sleeved on the shaft core 3 through the core hole 21 in the valve plate 2, and can be rotated around the axis in the middle section of the mounting hole 12.

[0037] The shaft core 3 can move along the axial direction of the mounting hole 12, and has a linkage position and a release position. In the linkage position, the first limiting block 31 on the outer periphery of the shaft core 3 is fitted into the first limiting groove 22 on the inner wall of the core hole 21 when the first limiting block 31 and the first limiting groove 22 are axially aligned, and at this time, the rotation of the shaft core 3 can drive the valve plate 2 to move synchronously; when the shaft core 3 moves along the axial direction to make the first limiting block 31 disengage from the first limiting groove 22, the shaft core 3 reaches the release position, and at this time, the shaft core 3 and the valve plate 2 no longer transmit torque to each other, and the shaft core 3 and the valve plate 2 can rotate relative to each other.

[0038] The swing-type check valve 100 in the embodiment of the present application realizes the switching of the shaft core 3 between the linkage position and the release position through the fitting and disengagement of the first limiting block 31 and the first limiting groove 22, so that the manual adjustment is only involved when needed, and does not affect the automatic opening and closing function of the valve in the normal working condition.

[0039] In some embodiments, the shaft core 3 comprises a second limiting block 32, and the first limiting block 31 and the second limiting block 32 are arranged opposite to each other in the radial direction of the shaft core 3.

[0040] The head section of the mounting hole 12 is provided with a first sliding groove 13 and a second sliding groove 14 extending along the axial direction thereof, and in the release position, the first limiting block 31 cooperates with the first sliding groove 13, and the second limiting block 32 cooperates with the second sliding groove 14.

[0041] In this embodiment, the shaft core 3 is provided with the second limiting block 32 on the opposite side of the first limiting block 31, and the two limiting blocks are arranged opposite to each other in the radial direction. When the adjuster 4 is not installed, the shaft core 3 is located at the release position, and at this time, the first limiting block 31 slides in the first sliding groove 13, and the second limiting block 32 slides in the second sliding groove 14, so as to ensure that the shaft core 3 is kept in circumferential positioning during the axial movement of the shaft core 3, and the shaft core 3 is prevented from being deflected.

[0042] The swing-type check valve 100 in the embodiment of the present application is provided with two limiting blocks symmetrically arranged on the shaft core 3, and cooperates with the double sliding groove structure in the mounting hole 12, so that the shaft core 3 can be stably guided in the release position, and the shaft core 3 is prevented from being stuck or tilted due to unilateral force.

[0043] In some embodiments, the swing-type check valve 100 comprises a reset member 5, and the reset member 5 is arranged in the tail section of the mounting hole 12 and has an acting force for moving the shaft core 3 towards the head section.

[0044] In this embodiment, the reset member 5 (such as a spring) is installed in the tail section of the mounting hole 12, one end of the reset member 5 abuts against the shaft core 3, and the other end of the reset member 5 abuts against the bottom of the hole, and the reset member 5 always applies a pushing force to the shaft core 3 towards the head section. When there is no external force, the pushing force keeps the shaft core 3 in the release position; when the adjuster 4 pushes the shaft core 3 to move towards the tail section, the shaft core 3 enters the linkage position. When the adjuster 4 is removed, the reset member 5 can automatically push the shaft core 3 back to the release position.

[0045] The swivel check valve 100 of the embodiment of the present application is automatically reset to the release position by the reset member 5 in the non-adjusting state, so that the valve is always in the state of being automatically opened and closed in the normal operation, and the normal function of the swivel check valve 100 is avoided from being affected due to the non-reset after manual operation.

[0046] In some embodiments, the mounting hole 12 is provided with a ring groove 15. The ring groove 15 is arranged between the head section and the middle section, and the second limiting block 32 can rotate in the ring groove 15 in the linkage position.

[0047] In this embodiment, the ring groove 15 is located in the transition region between the head section and the middle section of the mounting hole 12, and when the shaft core 3 is in the linkage position, the second limiting block 32 is separated from the second sliding groove 14 and enters the ring groove 15. Since the ring groove 15 is continuous and penetrates in the circumferential direction, the second limiting block 32 can freely rotate therein, so as to allow the shaft core 3 to drive the valve disc 2 to rotate without being axially constrained.

[0048] The swivel check valve 100 of the embodiment of the present application is automatically reset to the release position by the reset member 5 in the non-adjusting state, so that the valve is always in the state of being automatically opened and closed in the normal operation, and the normal function of the swivel check valve 100 is avoided from being affected due to the non-reset after manual operation.

[0049] In some embodiments, the adjuster 4 includes a lock head 41 and a cross-shaped plug 43. The outer circumferential side of the lock head 41 is provided with a locking block 42. The cross-shaped plug 43 is matched with the cross-shaped groove 33 on the shaft core 3.

[0050] In this embodiment, the adjuster 4 is composed of the lock head 41 and the cross-shaped plug 43. The cross-shaped plug 43 is used for being inserted into the cross-shaped groove 33 at the end of the shaft core 3 to realize torque transmission. The locking block 42 arranged on the outer circumference of the lock head 41 is used for being matched with a specific slot in the mounting hole 12 to realize the position locking function.

[0051] The locking block 42 is detachably connected with the valve body 1. By fixing the locking block 42 to the valve body 1, the valve disc 2 can be kept at a set opening degree. By detaching the locking block 42 from the valve body 1, the opening degree of the valve disc 2 can be adjusted.

[0052] The swivel check valve 100 of the embodiment of the present application realizes reliable transmission between the adjuster 4 and the shaft core 3 through the cooperation of the cross-shaped plug 43 and the cross-shaped groove 33, and uses the locking block 42 on the lock head 41 to provide a structural basis for subsequent locking operation, so that the adjusting and locking functions are integrated.

[0053] In some embodiments, the mounting hole 12 includes a hole opening, a locking groove 16, a closing opening 18 and an opening opening 17. The hole opening is formed in the head section.

[0054] The locking groove 16 is arranged on the inner circumferential wall of the head section, extends along the circumference of the mounting hole 12, and the locking block 42 is located in the locking groove 16 in the linkage position. The locking groove 16 has oppositely arranged outer and inner sides.

[0055] The closing port 18 and the opening port 17 are arranged on the end face of the orifice and both penetrate the outer side and communicate with the locking groove 16. The closing hole 181 and the opening hole 171 are arranged on the inner side. The closing hole 181 corresponds to the closing port 18, and the opening hole 171 corresponds to the opening port 17.

[0056] The swing check valve 100 includes a locking screw. The locking block 42 is provided with a locking hole. The locking screw is arranged in the locking hole and selectively cooperates with the opening hole 171 or the closing hole 181.

[0057] When the locking block 42 is in the closing hole 181, the valve plate 2 is closed. When the locking block 42 is fixed in the opening hole 171, the valve plate 2 is opened. The rotation angle of the valve plate 2 from the closed position to the open position is 90 degrees. Therefore, the closing port 18 and the opening port 17 are arranged at 90 degrees on the end face of the orifice and are adapted to the rotation direction of the valve plate 2.

[0058] In this embodiment, the head section of the mounting hole 12 is provided with a structure for positioning the regulator 4. The orifice serves as the entrance for the insertion of the regulator 4. The locking groove 16 circumferentially surrounds the inner wall of the head section and is embedded and rotated by the locking block 42 when the shaft core 3 is in the linkage position.

[0059] The closing port 18 and the opening port 17 are respectively arranged at two positions separated by 90 degrees on the end face of the orifice and each penetrates the outer side of the locking groove 16. The closing hole 181 and the opening hole 171 are respectively arranged on the inner side of the locking groove 16.

[0060] The closing upstream and downstream valves make the swing check valve 100 reset to the initial state. At this time, the valve plate 2 is drooping, the flow passage 11 is closed, and the first limiting block 31 is aligned with the first limiting groove 22 in the axial direction of the mounting hole 12 but is not embedded. The locking block 42 of the regulator 4 is aligned with the closing port 18, and then the regulator 4 is pressed. The first limiting block 31 can be slid into the first limiting groove 22. At this time, if the locking block 42 is fixed with the closing port 18 by using the locking screw, the flow passage 11 is closed.

[0061] At this time, if the regulator 4 is rotated, the valve plate 2 is opened. If the locking block 42 is rotated to the opening port 17, the valve plate 2 is fully opened. If the locking block 42 is fixed with the opening port 17 by using the locking screw, the flow passage 11 is in the fully open state.

[0062] The swing check valve 100 of the embodiment of the present application realizes mechanical locking of the valve disc 2 in the fully open position and the fully closed position by integrating the orifice, the locking groove 16, the closing port 18, the opening port 17 and the corresponding closing hole 181 and opening hole 171 in the head section of the mounting hole 12, and cooperating with the locking block 42 with a locking hole and the locking screw.

[0063] In some embodiments, the swing check valve 100 comprises a plug 6 which is detachably arranged in the mounting hole 12.

[0064] In this embodiment, when the swing check valve 100 is in normal operation, the regulator 4 is removed and the plug 6 is arranged at the orifice of the mounting hole 12 to close the mounting hole 12. When the swing check valve 100 needs to be overhauled, the plug 6 is removed and the regulator 4 is arranged.

[0065] Optionally, the tail section of the mounting hole 12 is also provided with a plug 6, which is used to close the mounting hole 12 and provide a support base for the reset member 5.

[0066] Optionally, the plug 6 is threadedly connected with the mounting hole 12 or is connected with the end surface of the mounting hole 12 by clamping.

[0067] In some embodiments, the valve disc 2 comprises a rotating shaft 23, a valve cover 24 and a rocker arm 25. The rotating shaft 23 is rotatably arranged in the middle section, and the core hole 21 is formed in the rotating shaft 23. The valve cover 24 is used to open and close the flow passage 11. The rocker arm 25 is used to connect the valve cover 24 and the rotating shaft 23.

[0068] In this embodiment, the rotating shaft 23 is arranged in the middle section of the mounting hole 12 and can rotate around its own axis, and the core hole 21 is arranged in the rotating shaft 23 to accommodate the shaft core 3. The valve cover 24 is used as a sealing element to directly control the opening and closing of the flow passage 11. The rocker arm 25 rigidly connects the valve cover 24 and the rotating shaft 23, and converts the rotation of the rotating shaft 23 into the swing of the valve cover 24.

[0069] The swing check valve 100 of the embodiment of the present application designs the valve disc 2 as the rotating shaft 23, the rocker arm 25 and the valve cover 24, so that the shaft core 3 can indirectly drive the valve cover 24 to act through the rotating shaft 23.

[0070] Optionally, a sealing member is arranged between the outer peripheral wall of the rotating shaft 23 and the inner peripheral wall of the mounting hole 12.

[0071] In some embodiments, in the axial direction of the mounting hole 12, the size of the annular groove 15 is greater than the size of the second limiting block 32.

[0072] In this embodiment, in the axial direction of the mounting hole 12, the width of the annular groove 15 is slightly greater than the width of the second limiting block 32, so that the second limiting block 32 can not only rotate circumferentially in the annular groove 15, but also have a small floating space in the axial direction, thereby avoiding being stuck due to machining errors or thermal expansion and contraction.

[0073] The swing check valve 100 of the embodiment of the present application has the annular groove 15 with an axial dimension slightly larger than the second limiting block 32, so that a reasonable gap is reserved for the second limiting block 32, the assembly precision requirement is reduced, and the movement reliability under different working conditions is improved.

[0074] Optionally, the swing check valve 100 comprises a top cover 7, which is detachably connected with the valve body 1. When the valve disc 2 cannot be adjusted by screwing the adjuster 4, the top cover 7 can be detached for maintenance.

[0075] Optionally, the surfaces of the first sliding groove 13 and the first limiting groove 22 are all arc surfaces, and the arc degree of the surfaces is consistent with that of the annular groove 15, so that the first limiting block 31 can move smoothly.

[0076] The surfaces of the first limiting block 31 and the second limiting block 32 are all arc surfaces, and the surfaces of the first sliding groove 13 and the second sliding groove 14 are all arc surfaces.

[0077] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A swing check valve, characterized in that, include: The valve body (1) has a flow channel (11) inside and a mounting hole (12) on it. A valve plate (2) is rotatably disposed on the valve body (1) for opening and closing the flow channel (11). The shaft core (3) is located in the mounting hole (12) and connected to the valve plate (2); The regulator (4) is detachably connected to the shaft (3) so as to adjust the opening of the valve plate (2) via the shaft (3).

2. The swing check valve according to claim 1, characterized in that, The valve plate (2) is rotatably disposed in the middle section of the mounting hole (12). The valve plate (2) is provided with a core hole (21). The inner peripheral wall of the core hole (21) is provided with a first limiting groove (22). The shaft core (3) passes through the core hole (21). The outer peripheral wall of the shaft core (3) is provided with a first limiting block (31). The shaft core (3) can move axially along the mounting hole (12). The shaft core (3) has a linkage position and a release position. In the linkage position, the first limiting block (31) cooperates with the first limiting groove (22) so that the shaft core (3) and the valve plate (2) can rotate synchronously. In the release position, the first limiting block (31) separates from the first limiting groove (22) so that the shaft core (3) and the valve plate (2) can rotate relative to each other.

3. The swing check valve according to claim 2, characterized in that, The shaft core (3) includes a second limiting block (32), which is arranged opposite to the first limiting block (31) in the radial direction of the shaft core (3). The mounting hole (12) has a first groove (13) and a second groove (14) extending along its axial direction in the head section. In the release position, the first limiting block (31) cooperates with the first groove (13), and the second limiting block (32) cooperates with the second groove (14).

4. The swing check valve according to claim 3, characterized in that, The swing check valve includes: The reset member (5) is located at the tail end of the mounting hole (12) and has a force that causes the shaft core (3) to move toward the head end.

5. The swing check valve according to claim 3, characterized in that, The mounting hole (12) is provided with: An annular groove (15) is provided between the head section and the middle section. In the linkage position, the second limiting block (32) can rotate within the annular groove (15).

6. The swing check valve according to claim 3, characterized in that, The regulator (4) includes: The lock head (41) has a locking block (42) on its outer periphery. The cross-shaped insert (43) engages with the cross groove (33) on the shaft core (3).

7. The swing check valve according to claim 6, characterized in that, The mounting hole (12) includes: An opening is formed in the head section; A locking groove (16) is provided on the inner peripheral wall of the head section and extends circumferentially along the mounting hole (12). In the linkage position, the locking block (42) is located in the locking groove (16). The locking groove (16) has an outer side and an inner side arranged opposite to each other. The closing port (18) and the opening port (17) are arranged at intervals on the end face of the opening and both penetrate the outer side and communicate with the locking groove (16). The inner side is provided with a closing hole (181) and an opening hole (171), the closing hole (181) corresponds to the closing port (18), and the opening hole (171) corresponds to the opening port (17). The swing check valve includes a set screw, and the locking block (42) is provided with a locking hole. The set screw passes through the locking hole and is selected to cooperate with either the opening hole (171) or the closing hole (181).

8. The swing check valve according to claim 1, characterized in that, The swing check valve includes a plug (6) which is detachably disposed in the mounting hole (12).

9. The swing check valve according to claim 2, characterized in that, The valve plate (2) includes: A rotating shaft (23) is rotatably disposed within the middle section, and the core hole (21) is formed within the rotating shaft (23); Valve cover (24) is used to open and close the flow channel (11); A rocker arm (25) is used to connect the valve cover (24) and the rotating shaft (23).

10. The swing check valve according to claim 5, characterized in that, In the axial direction of the mounting hole (12), the size of the annular groove (15) is larger than the size of the second limiting block (32).

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