Plate type check valve

Abstract

The plate type check valve comprises a valve base, a valve disc, a valve disc, a rotating component and an elastic buffering assembly, the valve base is cylindrical, the valve disc is arranged at the end of the valve base, the valve base is rotationally connected with the valve disc, the elastic buffering assembly is arranged on the valve base, one end of the elastic buffering assembly makes contact with the valve disc, and the elastic buffering assembly can stretch out and draw back in the axial direction. The valve disc is pushed to rotate around the rotating part, so that the valve disc can be buckled to the end of the valve base, the valve disc and the valve base are connected in a sealed mode, the elastic buffering assembly can achieve the damping effect, the volume when the valve disc falls back to the valve base is reduced, and leakage caused by damage of the sealing face between the valve disc and the valve base is avoided; and the service life of the check valve is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil cylinder disassembly, and particularly relates to a plate check valve. Background Art

[0002] In the existing plate check valve, when checking, the valve disc directly contacts the valve base without buffering. When the pressure is high, there is no buffering when the valve disc returns to its seat, resulting in excessive noise and easy damage to the sealing surface, causing easy leakage of the check valve parts and short service life. Summary of the Invention

[0003] An embodiment of the present invention provides a plate check valve, which reduces the volume when the valve disc falls back to the valve base, avoids leakage caused by damage to the sealing surface between the valve disc and the valve base, and improves the service life of the check valve.

[0004] The present invention provides a plate check valve, including: a valve base, which is a cylindrical structure with a through hole, including a first end for the inflow of gas or liquid and a second end for the outflow of the gas or liquid; a valve disc, which is arranged at the second end or close to the second end; an elastic buffer assembly, which is arranged on the valve base, one end of which abuts against or is fixedly connected to the valve disc, and expands and contracts in the direction of the central axis of the valve base, applying a driving force from the first end towards the second end to the valve disc.

[0005] In some alternative embodiments, the valve disc includes a pressing cover plate, a protrusion and a sealing ring. The protrusion is arranged on the side of the pressing cover plate facing the valve base, the sealing ring is arranged along the circumferential side of the protrusion and is coaxial with the pressing cover plate, the sealing ring and the protrusion.

[0006] In some alternative embodiments, the valve base includes a stepped groove, which is arranged along the circumferential direction of the through hole and is communicated with the through hole. The stepped groove is used to accommodate the pressing cover plate and the protrusion.

[0007] In some alternative embodiments, the valve base and the valve disc are connected by a rotating component. The rotating component includes a rotating shaft and a supporting element. The supporting element is arranged on the valve disc, and the rotating shaft connects the supporting element and the valve base.

[0008] In some alternative embodiments, the plate check valve further includes a support plate, which is arranged at the through hole and is connected to the valve base, and the support plate fixedly supports the elastic buffer assembly.

[0009] In some alternative embodiments, the support plate is provided with a limiting hole, which is used to accommodate the elastic buffer assembly, and the support plate and the elastic buffer assembly located outside the limiting hole are connected by a bolt assembly.

[0010] In some alternative embodiments, the elastic buffer assembly includes a buffer cylinder, a limit plate, a buffer piston, and a filtering component. The two axially opposite ends of the buffer cylinder are respectively connected to the filtering component and the limit plate. The buffer cylinder is received in the limit hole. The limit plate is in contact with the support plate. The limit plate and the support plate are connected by a bolt assembly. One end of the buffer piston is located inside the buffer cylinder, and the other end of the buffer piston abuts against the valve disc.

[0011] In some alternative embodiments, a flow guiding component is provided inside the buffer cylinder. The peripheral side of the flow guiding component is connected to the inner surface of the buffer cylinder. The flow guiding component divides the buffer cylinder into a first chamber and a second chamber. The flow guiding component is provided with a through hole that communicates the first chamber and the second chamber. One end of the buffer piston is located in the first chamber.

[0012] In some alternative embodiments, the buffer piston includes a sliding block and a buffer plug. One end of the sliding block is disposed in the first chamber. A fourth groove is provided at the other end of the sliding block. The buffer plug is disposed in the fourth groove. The buffer plug is in abutting connection with the valve disc.

[0013] In some alternative embodiments, the filtering component is a filter screen. The filter screen is provided with a plurality of filter holes. The projected area of the plurality of filter holes in the axial direction of the valve base is smaller than the projected area of the buffer piston in the axial direction of the valve base.

[0014] The beneficial effects brought by the present invention are as follows:

[0015] As can be seen from the above solution, the embodiment of the present invention provides a plate check valve, which includes: a valve base, a valve disc, a valve disc and an elastic buffer assembly. The valve base is a cylindrical structure with a through hole. The valve base includes a first end where gas or liquid flows in and a second end where the gas or liquid flows out. One side of the valve disc is rotatably connected to one side of the second end. The elastic buffer assembly is arranged on the valve base. One end of the elastic buffer assembly abuts against the valve disc. The elastic buffer assembly expands and contracts in the direction of the central axis extension of the valve base, and applies a driving force from the first end towards the second end to the valve disc, pushing the valve disc to move away from the valve base or pressing against the valve base. When the fluid or gas moves forward from the first end towards the second end, the liquid pushes the valve disc to move away from the valve base, so that there is a gap between the valve base and the valve disc, enabling the liquid or gas to flow smoothly. When the fluid or gas moves in the reverse direction, the liquid pushes the valve disc towards the valve base, so that the valve disc can be buckled at the end of the valve base, and the valve disc can block the through hole for the liquid or gas to flow through the valve base, preventing the refluxed liquid from entering the interior of the valve base, so that the valve disc and the valve base are hermetically connected. The elastic buffer assembly applies a driving force from the first end towards the second end to the valve disc, which can play a role in shock absorption, reduce the volume when the valve disc falls back to the valve base, avoid leakage caused by damage to the sealing surface between the valve disc and the valve base, and improve the service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 6 is a schematic cross-sectional structure diagram of a plate check valve provided by an embodiment of the present invention in an open state;

[0017] Figure 2 FIG. 10 is a schematic cross-sectional structure diagram of a plate check valve provided by an embodiment of the present invention in a closed state;

[0018] Figure 3 is Figure 2 a schematic structural diagram of the plate check valve provided by the embodiment in a first direction;

[0019] Figure 4 FIG. 20 is a schematic structural diagram of a rotating component provided by an embodiment of the present invention;

[0020] Figure 5 is Figure 2 a schematic structural diagram of the elastic buffer assembly provided by the embodiment.

[0021] In the figure, 1 is the valve base; 11 is the first groove; 12 is the second groove; 13 is the through hole; 14 is the support plate; 15 is the bolt assembly; 2 is the valve disc; 3 is the rotating component; 31 is the rotating shaft; 32 is the support element; 321 is the support sleeve; 322 is the extension plate; 33 is the limiting element; 4 is the elastic buffer assembly; 41 is the buffer cylinder; 42 is the limiting plate; 43 is the buffer piston; 431 is the sliding block; 432 is the buffer plug; 433 is the buffer pad; 44 is the filtering component; 45 is the diversion component. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the present invention clearer, 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. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the existing plate check valve, when checking, the valve disc 2 directly contacts the valve disc 2 base without buffering. When the pressure is high, the sound is too loud when the valve disc 2 returns to its seat without buffering, and the sealing surface is easily damaged, resulting in easy leakage of the check valve parts and short service life.

[0024] The embodiment of the present invention provides a plate check valve, which reduces the volume when the valve disc 2 falls back to the valve disc 2 base, avoids leakage caused by damage to the sealing surface between the valve disc 2 and the valve disc 2 base, and improves the service life of the check valve.

[0025] The following will be described in detail with reference to the Figures 1 to 5 plate check valve in the accompanying drawings of the specification.

[0026] The present invention provides a plate check valve, which includes: a valve base 1, which is a cylindrical structure with a through hole 13, including a first end for the inflow of gas or liquid and a second end for the outflow of the gas or liquid; a valve disc 2, one side of which is rotatably connected to one side of the second end; an elastic buffer assembly 4, which is arranged on the valve base 1, one end of which abuts against the valve disc 2, and expands and contracts in the direction of the central axis extension of the valve base 1 to apply a driving force from the first end towards the second end to the valve disc 2.

[0027] Specifically, the plate check valve includes a valve base 1, a valve disc 2, and an elastic buffer assembly 4. The valve base 1 is a cylindrical structure with a through hole 13. The valve base 1 includes a first end where gas or liquid flows in and a second end where the gas or liquid flows out. One side of the valve disc 2 is rotatably connected to one side of the second end. The elastic buffer assembly 4 is disposed in the valve base 1. One end of the elastic buffer assembly 4 abuts against the valve disc 2. The elastic buffer assembly 4 expands and contracts in the direction of the central axis extension of the valve base 1, applying a driving force from the first end towards the second end to the valve disc 2, pushing the valve disc 2 to move away from the valve base 1 or pressing against the valve base 1. When the fluid or gas moves forward from the first end towards the second end, the liquid pushes the valve disc 2 to move away from the valve base 1, creating a gap between the valve base 1 and the valve disc 2, so that the liquid or gas can flow smoothly. When the fluid or gas moves in the reverse direction, the liquid pushes the valve disc 2 towards the valve base 1, enabling the valve disc 2 to fit onto the end of the valve base 1. The valve disc 2 can block the through hole 13 for the liquid or gas to flow through in the valve base 1, preventing the backflow of the liquid from entering the interior of the valve base 1, thus making the valve disc 2 and the valve base 1 be in a sealed connection. The elastic buffer assembly 4 applying a driving force from the first end towards the second end to the valve disc 2 can achieve the effect of shock absorption, reduce the sound volume when the valve disc 2 falls back onto the valve base 1, avoid leakage caused by damage to the sealing surface between the valve disc 2 and the valve base 1, and improve the service life of the check valve.

[0028] In some alternative embodiments, the valve base 1 and the valve disc 2 are connected by a rotating component 3. The rotating component 3 includes a rotating shaft 31 and a supporting element 32. The supporting element 32 is disposed on the valve disc 2. The rotating shaft 31 connects the supporting element 32 and the valve base 1.

[0029] Specifically, the supporting element 32 includes a supporting sleeve 321 and an extension plate 322. The extension plate 322 connects the supporting sleeve 321 and the valve disc 2 respectively. The rotating shaft 31 passes through both ends of the supporting sleeve 321 and is connected to the valve base 1. The valve disc 2 can rotate around the rotating shaft 31. The valve base 1 is provided with a third groove for accommodating the rotating component 3. The third groove communicates with the second groove 12. The depths of the third groove and the second end are the same in the direction from the second end towards the first end.

[0030] Furthermore, the rotating component 3 further includes a limiting element 33. The limiting element is a limiting bolt. There are two limiting bolts. The rotating shaft 31 passes through both ends of the supporting sleeve 321 and is respectively connected to the limiting bolts. The limiting bolts are disposed in the third groove. The limiting bolts are used to fix the rotating shaft 31. The supporting element 32 can rotate around the rotating shaft. The supporting element 32 is connected to the valve disc 2, so that the valve disc 2 can be rotatably connected to the valve base 1.

[0031] In some alternative embodiments, the valve disc 2 includes a pressing cover plate, a protrusion, and a sealing ring. The protrusion is disposed on one side of the pressing cover plate facing the valve base 1. The sealing ring is disposed along the circumferential side of the protrusion and is coaxial with the pressing cover plate.

[0032] Specifically, the valve disc 2 includes a first groove 11 and a second groove 12. The through hole 13, the first groove 11, and the second groove 12 are concentric. The through hole 13, the first groove 11, and the second groove 12 are sequentially disposed along the radial direction of the valve base 1. The axial depths of the through hole 13, the first groove 11, and the second groove 12 in the valve base 1 are gradually decreasing. The protrusion can be clamped in the first groove 11, and the pressing cover plate can be disposed in the second groove 12, so as to block the through hole 13 inside the first groove 11. The sealing ring is disposed around the circumferential side of the protrusion, and the sealing ring is attached to the inner surface of the pressing cover plate. The valve base 1 is used for liquid circulation. The liquid flows from the first end of the valve base 1 to the second end. The liquid flows through the elastic buffer assembly 4, and the elastic buffer assembly 4 expands and contracts, so that it can expand and contract axially, pushing the valve disc 2 to rotate around the rotating member 3, so that the valve disc 2 can be buckled to the end of the valve base 1, thereby preventing the liquid from passing through the valve base 1, making the valve disc 2 and the valve base 1 in sealed connection. The elastic buffer assembly 4 can play a role in shock absorption, reduce the volume when the valve disc 2 returns to the valve base 1, avoid leakage caused by damage to the sealing surface between the valve disc 2 and the valve base 1, and improve the service life of the check valve.

[0033] In some alternative embodiments, the plate-type check valve further includes a support plate 14. The support plate 14 is provided with a limit hole for accommodating the elastic buffer assembly 4. The support plate 14 and the elastic buffer assembly 4 located outside the limit hole are connected by a bolt assembly 15.

[0034] Specifically, the support plate 14 is disposed inside the valve base 1. The support plate 14 is radially parallel to the valve base 1. The length of the support plate 14 is less than the radius of the inner surface of the valve base 1. The support plate 14 is used to fix the elastic buffer assembly 4. The support plate 14 is rectangular, and one end connected to the valve base 1 is arc-shaped, so that it can be connected to the inner surface of the valve base 1. The telescopic direction of the elastic buffer assembly 4 is the same as the axial direction of the valve base 1. The elastic buffer assembly 4 is detachably installed on the support plate 14. Optionally, the elastic buffer assembly 4 and the support plate 14 are connected by a bolt assembly 15, which facilitates the installation and disassembly of the elastic buffer assembly 4. The valve base 1 is used for liquid circulation. The liquid flows from the first end of the valve base 1 to the second end. The liquid flows through the elastic buffer assembly 4, and the elastic buffer assembly 4 expands and contracts, so that it can expand and contract axially, pushing the valve disc 2 to rotate around the rotating member 3, so that the valve disc 2 can be buckled at the end of the valve base 1, thereby preventing the liquid from passing through the valve base 1, making the valve disc 2 and the valve base 1 in sealed connection. The elastic buffer assembly 4 can play a shock-absorbing effect, reduce the volume when the valve disc 2 falls back to the valve base 1, avoid leakage caused by damage to the sealing surface between the valve disc 2 and the valve base 1, and improve the service life of the check valve.

[0035] In some alternative embodiments, the support plate 14 is provided with a limiting hole, the elastic buffer assembly 4 is disposed in the limiting hole, and the elastic buffer assembly 4 and the support plate 14 are connected by a bolt assembly 15.

[0036] Specifically, the support plate 14 is disposed inside the valve base 1. The support plate 14 is radially parallel to the valve base 1. The length of the support plate 14 is less than the radius of the inner surface of the valve base 1. The support plate 14 is provided with a limiting hole, the elastic buffer assembly 4 is disposed in the limiting hole, and the elastic buffer assembly 4 and the support plate 14 are connected by a bolt assembly 15, thereby detachably installing the elastic buffer assembly 4 on the support plate 14. The valve base 1 is used for liquid circulation. The liquid flows from the first end of the valve base 1 to the second end. The liquid flows through the elastic buffer assembly 4, and the elastic buffer assembly 4 expands and contracts, so that it can expand and contract axially, pushing the valve disc 2 to rotate around the rotating member 3, so that the valve disc 2 can be buckled at the end of the valve base 1, thereby preventing the liquid from passing through the valve base 1, making the valve disc 2 and the valve base 1 in sealed connection. The elastic buffer assembly 4 can play a shock-absorbing effect, reduce the volume when the valve disc 2 falls back to the valve base 1, avoid leakage caused by damage to the sealing surface between the valve disc 2 and the valve base 1, and improve the service life of the check valve.

[0037] In some alternative embodiments, the valve base 1 includes a stepped groove, the stepped groove is arranged along the circumferential direction of the through hole 13, the stepped groove communicates with the through hole 13, and the stepped groove is used to accommodate the valve disc 2.

[0038] Specifically, the stepped groove includes a first groove 11 and a second groove 12. The through hole 13, the first groove 11, and the second groove 12 are concentric. The through hole 13, the first groove 11, and the second groove 12 are arranged in sequence along the radial direction of the valve base 1. The through hole 13, the first groove 11, and the second groove 12 gradually decrease in depth in the direction of the central axis extension of the valve base 1. The first groove 11 is used to accommodate the protrusion, and the second groove 12 is used to accommodate the pressing cover plate.

[0039] In some alternative embodiments, the elastic buffer assembly 4 includes a buffer cylinder 41, a limit plate 42, a buffer piston 43, and a filtering component 44. The two axially opposite ends of the buffer cylinder 41 are respectively connected to the filtering component 44 and the limit plate 42. The buffer cylinder 41 is received in the limit hole. The limit plate 42 is in contact with the support plate 14. The limit plate 42 and the support plate 14 are connected by a bolt assembly 15. One end of the buffer piston 43 is located inside the buffer cylinder 41, and the other end of the buffer piston 43 penetrates through the limit plate 42 and abuts against the valve disc 2.

[0040] Specifically, the limit plate 42 is in contact with the support plate 14. The support plate 14 is provided with a limit hole, and the buffer cylinder 41 is disposed in the limit hole. The limit plate 42 and the support plate 14 are connected by a bolt assembly 15. The liquid flows from the first end of the valve base 1 to the second end. The liquid flows through the buffer cylinder 41. The liquid pushes the buffer piston 43 to move inside the buffer cylinder 41. The buffer piston 43 gradually drills out of the buffer cylinder 41. The buffer piston 43 thus pushes the valve disc 2 to rotate, so that the valve disc 2 can be buckled to the end of the valve base 1, thereby preventing the liquid from passing through the valve base 1, making the valve disc 2 and the valve base 1 in sealed connection. The elastic buffer assembly 4 can play a role in shock absorption, reduce the volume when the valve disc 2 falls back to the valve base 1, avoid leakage caused by damage to the sealing surface between the valve disc 2 and the valve base 1, and improve the service life of the check valve.

[0041] In some alternative embodiments, a flow guiding component 45 is provided inside the buffer cylinder 41. The peripheral side of the flow guiding component 45 is connected to the inner surface of the buffer cylinder 41. The flow guiding component 45 divides the buffer cylinder 41 into a first chamber and a second chamber. The flow guiding component 45 is provided with a through hole 13. The through hole 13 communicates the first chamber and the second chamber. One end of the buffer piston 43 is located in the first chamber.

[0042] Specifically, a guide component 45 is arranged inside the buffer cylinder 41, and the guide component 45 divides the buffer cylinder 41 into a first chamber and a second chamber. One end of the buffer piston 43 is arranged in the first chamber, and the guide component 45 is provided with a through hole 13, and the through hole 13 connects the first chamber and the second chamber. The liquid flows from the first end of the valve base 1 to the second end, and the liquid flows through the filter component 44, the first chamber, the through hole 13 and the second chamber. The liquid pushes the buffer piston 43, and the buffer piston 43 gradually drills out of the buffer cylinder 41. The buffer piston 43 thereby pushes the valve disc 2 to rotate, so that the valve disc 2 can be buckled on the end of the valve base 1, thereby preventing the liquid from passing through the valve base 1, so that the valve disc 2 is sealed and connected to the valve base 1, and the elastic buffer component 4 can play a shock-absorbing effect, reduce the volume when the valve disc 2 falls back to the valve base 1, avoid leakage caused by damage to the sealing surface between the valve disc 2 and the valve base 1, and improve the service life of the check valve.

[0043] In some optional embodiments, the buffer piston 43 includes a sliding block 431, a buffer plug 432 and a buffer pad 433, one end of the sliding block 431 is arranged in the first chamber, the sliding block 431 is arranged at the end of the first chamber and a fifth groove is arranged, the buffer pad 433 is arranged in the fifth groove, the other end of the sliding block 431 is arranged in the fourth groove, and the buffer plug 432 is arranged in the fourth groove, and the buffer plug 432 is connected to the valve disc 2 in abutment with it.

[0044] Specifically, a guide component 45 is arranged inside the buffer cylinder 41, and the guide component 45 divides the buffer cylinder 41 into a first chamber and a second chamber. One end of the buffer piston 43 is arranged in the first chamber, and the guide component 45 is provided with a through hole 13, and the through hole 13 connects the first chamber and the second chamber. The liquid flows from the first end of the valve base 1 to the second end, and the liquid flows through the filter component 44, the first chamber, the through hole 13 and the second chamber. The liquid pushes the sliding block 431, and the sliding block 431 gradually drills out of the buffer cylinder 41. The buffer plug 432 is in contact with the valve disc 2, and the sliding block 431 pushes the valve disc 2 to rotate, so that the valve disc 2 can be buckled on the end of the valve base 1, thereby preventing the liquid from passing through the valve base 1, so that the valve disc 2 is sealed and connected to the valve base 1, and the elastic buffer component 4 can play a shock-absorbing effect, reduce the volume when the valve disc 2 falls back to the valve base 1, avoid leakage caused by damage to the sealing surface between the valve disc 2 and the valve base 1, and improve the service life of the check valve.

[0045] In some optional embodiments, the filter component 44 is a filter net having a plurality of filter holes, and the axial projection area of ​​the plurality of filter holes on the valve base 1 is smaller than the axial projection area of ​​the buffer piston 43 on the valve base 1 .

[0046] Specifically, the filtering component 44 is a filter screen, which is provided with a plurality of filter holes. The diameter of the filter holes is smaller than the area of the cross-section of the buffer piston 43, so that the buffer piston 43 can move slowly. The buffer piston 43 gradually drills out of the buffer cylinder 41, and the buffer piston 43 thus pushes the valve disc 2 to rotate, enabling the valve disc 2 to be buckled on the end of the valve base 1, thereby preventing the liquid from passing through the valve base 1, making the valve disc 2 and the valve base 1 be sealed and connected. The elastic buffer assembly 4 can play a role in shock absorption, reduce the sound when the valve disc 2 falls back to the valve base 1, avoid leakage caused by damage to the sealing surface between the valve disc 2 and the valve base 1, and improve the service life of the check valve.

[0047] Further, when the plate check valve is opened, the fluid enters the buffer cylinder 41 through the small holes at the bottom of the buffer cylinder 41. Due to the pressure difference between the two sides of the buffer cylinder 41, the buffer piston 43 rises; when checking, the valve disc 2 pushes the buffer piston 43 to move. Since the cross-sectional area of the buffer piston 43 is much larger than the total area of the filter holes of the filtering component 44, the buffer piston 43 can only move forward slowly, prompting the valve disc 2 to fall back slowly, which can improve the service life of the plate check valve. The filtering component 44 at the bottom of the buffer cylinder 41 can filter larger particles in the fluid to prevent the larger particles from blocking the small holes, so as to improve the service life of the buffer cylinder 41.

[0048] Further, the end face of the flow guiding component 45 facing the filtering component 44 is conical, and the diameter of the conical surface of the flow guiding component 45 becomes smaller from the direction of the filtering component 44 to the limiting plate 42.

[0049] Specifically, the conical surface of the flow guiding component 45 has a guiding effect on the fluid, enabling the fluid to flow into the first chamber more smoothly.

[0050] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A plate type check valve, characterized in that: include: The valve base (1) is a cylindrical structure having a through hole (13), comprising a first end for gas or liquid to flow in and a second end for the gas or liquid to flow out; a valve disc (2), one side of which is rotatably connected to one side of the second end; An elastic buffer component (4) is arranged on the valve base (1), one end of which contacts the valve disc (2), and is retracted in the direction of extension of the central axis of the valve base (1), exerting a pushing force from the first end toward the second end on the valve disc (2).

2. The plate-type check valve according to claim 1, characterized in that: The valve disc (2) comprises a clamping cover plate, a protrusion and a sealing ring, wherein the protrusion is arranged on a side of the clamping cover plate facing the valve base (1), and the sealing ring is arranged along the circumference of the protrusion and together with the clamping cover plate, and the clamping cover plate, the sealing ring and the protrusion are coaxially arranged.

3. The plate type check valve according to claim 2, characterized in that: The valve base (1) comprises a stepped groove, which is arranged along the circumference of the through hole (13), the stepped groove is connected to the through hole (13), and the stepped groove is used to accommodate the pressing cover plate and the protrusion.

4. The plate type check valve according to claim 1, characterized in that: The valve base (1) and the valve disc (2) are connected via a rotating component (3), wherein the rotating component (3) comprises a rotating shaft (31) and a supporting element (32), wherein the supporting element (32) is arranged on the valve disc (2), and the rotating shaft (31) connects the supporting element (32) and the valve base (1).

5. The plate-type check valve according to claim 1, characterized in that: The plate-type check valve further comprises a support plate (14), wherein the support plate (14) is arranged in the through hole (13) and connected to the valve base (1), and the support plate (14) fixedly supports the elastic buffer assembly (4).

6. The plate type check valve according to claim 5, characterized in that: The support plate (14) is provided with a limiting hole, the limiting hole is used to accommodate the elastic buffer component (4), and the support plate (14) is connected to the elastic buffer component (4) located outside the limiting hole via a bolt assembly (15).

7. The plate-type check valve according to claim 6, characterized in that: The elastic buffer assembly (4) comprises a buffer cylinder (41), a limit plate (42), a buffer piston (43) and a filter component (44); the two axially opposite ends of the buffer cylinder (41) are respectively connected to the filter component (44) and the limit plate (42); the buffer cylinder (41) is accommodated in the limit hole; the limit plate (42) is fitted with the support plate (14); the limit plate (42) and the support plate (14) are connected via the bolt assembly (15); one end of the buffer piston (43) is located inside the buffer cylinder (41); the other end of the buffer piston (43) penetrates the limit plate (42) and contacts the valve disc (2).

8. The plate type check valve according to claim 7, characterized in that: A flow guide component (45) is arranged inside the buffer cylinder (41), and the peripheral side of the flow guide component (45) is connected to the inner surface of the buffer cylinder (41). The flow guide component (45) divides the buffer cylinder (41) into a first chamber and a second chamber. The flow guide component (45) is provided with a through hole (13), and the through hole (13) connects the first chamber and the second chamber. One end of the buffer piston (43) is located in the first chamber.

9. The plate-type check valve according to claim 8, characterized in that: The buffer piston (43) includes a sliding block (431), a buffer plug (432) and a buffer pad (433), one end of the sliding block (431) is arranged in the first chamber, the sliding block (431) is arranged at the end of the first chamber and a fifth groove is arranged, the buffer pad (433) is arranged in the fifth groove, the other end of the sliding block (431) is arranged in the fourth groove, and the buffer plug (432) is connected to the valve disc (2) in abutting manner.

10. The plate-type check valve according to claim 8, characterized in that: The filter component (44) is a filter screen, the filter screen is provided with a plurality of filter holes, and the axial projection area of ​​the plurality of filter holes on the valve base (1) is smaller than the axial projection area of ​​the buffer piston (43) on the valve base (1).

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