Structure for preventing screws from falling off and butterfly valve

Abstract

The utility model discloses a structure for preventing screws from falling off and a butterfly valve, and relates to the field of butterfly valves. The screw falling prevention structure comprises a pressing ring, the pressing ring is suitable for being detachably connected with the butterfly plate frame, at least two counter bore structures are arranged on the pressing ring in a penetrating mode, a connecting hole and a limiting cavity are formed in any counter bore structure and communicate with each other, and the connecting hole is suitable for a fastener to penetrate through so as to connect the pressing ring and the external butterfly plate frame. The limiting cavity is at least suitable for axially restraining the fastener. According to the structure for preventing the screw from falling off, in a specific use occasion, the pressing ring is connected with the butterfly plate frame through the fastening piece; the fastening piece can be axially restrained through the limiting cavity in the counter bore structure, the fastening piece is prevented from being disconnected under the valve vibration working condition, the fastening piece can be effectively prevented from falling off, and the risk that other equipment on a pipeline is damaged is avoided; when the valve needs to be adjusted and maintained, the pressing ring and the butterfly plate frame can be rapidly detached, and operation and adjustment are convenient and fast.

Description

Technical Field

[0001] The utility model relates to the field of butterfly valves, in particular to a screw-falling prevention structure and a butterfly valve. Background Art

[0002] After the valve is installed on the pipeline, the flow of the working medium and the influence of other vibrating equipment on the pipeline will cause the valve to vibrate. The vibration of the valve will have a vibration effect on the various parts on the valve. The parts on the valve are easy to fall into the pipeline during use and flow with the medium, posing a risk of damaging other equipment on the pipeline.

[0003] At present, the common way to prevent the compression ring screws of three-eccentric butterfly valves from falling off is to fix the screws and the compression ring on the compression ring relatively by spot welding after the screws are assembled and installed. The fixing effect is good and can effectively prevent the screws from falling off. However, when problems occur in the valve, the screws on the compression ring cannot be removed quickly and the welding points need to be ground and destroyed before disassembly. The actual operation steps are cumbersome and there is a risk of damaging other parts when cutting off the welding points. Utility Model Content

[0004] In order to solve the technical problems raised by the above background technology, the utility model provides a screw-proof structure, comprising:

[0005] The pressure ring is suitable for being detachably connected to the butterfly plate frame. At least two countersunk hole structures are arranged through the pressure ring. A connecting hole and a limiting cavity are arranged in any countersunk hole structure. The connecting hole and the limiting cavity are connected. The connecting hole is suitable for fasteners to pass through to connect the pressure ring and the external butterfly plate frame. The limiting cavity is at least suitable for axially constraining the fasteners.

[0006] As a preferred technical solution, the countersunk hole structure also includes a first limiting portion, which is protrudingly arranged on the inner wall of the countersunk hole structure, the connecting hole structure is arranged in the first limiting portion, and the limiting cavity is arranged on a side of the first limiting portion close to the butterfly plate frame.

[0007] As a preferred technical solution, the countersunk hole structure further includes a second limiting portion, which is protrudingly arranged on the inner wall of the countersunk hole structure, and the first limiting portion and the second limiting portion are arranged at intervals.

[0008] As a preferred technical solution, the limiting cavity includes a first waist-shaped hole and a second waist-shaped hole which are connected to each other, and the first waist-shaped hole is arranged between the connecting hole and the second waist-shaped hole; the first waist-shaped hole is arranged between the first limiting part and the second limiting part, the first waist-shaped hole is suitable for accommodating the head end of the fastener, and the second waist-shaped hole is suitable for the fastener to pass through.

[0009] As a preferred technical solution, the pressure ring is configured as a rotating body structure, the first waist-shaped hole and the second waist-shaped hole are distributed in a ring shape on the pressure ring, and the central axis of the first waist-shaped hole and the central axis of the second waist-shaped hole are offset from each other; on the radial cross-section of the pressure ring, the cross-sectional area of ​​the first waist-shaped hole is larger than the cross-sectional area of ​​the second waist-shaped hole.

[0010] As a preferred technical solution, the anti-screw falling structure also includes a flat washer, which is suitable for being sleeved on the fastener, and the flat washer and the second limiting portion are abutted against each other, and the sum of the thickness of the flat washer and the thickness of the fastener head end is less than the straight-line distance between the first limiting portion and the second limiting portion.

[0011] The utility model also provides a butterfly valve, comprising a fastener and a screw-off prevention structure, wherein the fastener and the countersunk hole structure in the screw-off prevention structure are connected and arranged correspondingly.

[0012] As a preferred technical solution, the butterfly valve also includes a butterfly plate frame, a valve body and a valve stem. The butterfly plate frame and the pressure ring in the anti-screw falling-off structure are threadedly connected through a plurality of fasteners. The pressure ring is abutted and installed on the lateral end face of the butterfly plate frame. The butterfly plate frame and the valve body are sealingly connected. The butterfly plate frame and the valve stem are fixedly connected. The valve stem and the valve body are rotatably configured.

[0013] As a preferred technical solution, the butterfly plate frame is provided with a plurality of assembly holes, and the assembly holes and the countersunk hole structures are arranged correspondingly; and / or

[0014] The butterfly plate frame is provided with a protrusion, the protrusion is arranged as a rotating body structure, and the outer peripheral side wall of the protrusion is arranged to abut against the inner wall surface of the pressure ring.

[0015] As a preferred technical solution, the butterfly valve also includes a wound gasket and a sealing ring, the wound gasket and the sealing ring are sleeved on the butterfly plate frame, the sealing ring is abutted between the pressure ring and the butterfly plate frame, and the wound gasket is arranged on the side of the sealing ring away from the pressure ring.

[0016] The technical solution provided by the utility model has the following advantages:

[0017] The utility model provides a screw-fall-proof structure, comprising a pressure ring, which is suitable for being detachably connected to a butterfly plate frame. At least two countersunk hole structures are provided through the pressure ring, and a connecting hole and a limiting cavity are provided in any countersunk hole structure. The connecting hole and the limiting cavity are connected and arranged. The connecting hole is suitable for a fastener to pass through so as to connect the pressure ring and an external butterfly plate frame, and the limiting cavity is at least suitable for axially constraining the fastener.

[0018] This structure has a screw-proof structure that prevents the screw from falling off. In specific usage scenarios, the compression ring is connected to the butterfly plate frame by fasteners. The limit cavity in the countersunk hole structure can axially constrain the fastener to prevent the fastener from being disconnected under valve vibration conditions, which can effectively prevent the fastener from falling off and avoid the risk of damaging other equipment on the pipeline. When the valve needs to be adjusted and repaired, the compression ring and the butterfly plate frame can be quickly disassembled, and the operation and adjustment are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of the butterfly valve provided by the utility model;

[0021] Figure 2 A schematic diagram of the connection between the intermediate pressure ring and the butterfly plate frame of the butterfly valve provided by the utility model;

[0022] Figure 3 A schematic diagram of the structure of the pressure ring in the screw-fall-off prevention structure provided by the utility model;

[0023] Figure 4 A partial schematic diagram of a pressure ring in the screw-falling prevention structure provided by the utility model;

[0024] Figure 5 A schematic diagram of the fastener placement stage in the screw-fall-off prevention structure provided by the utility model;

[0025] Figure 6 A schematic diagram of the fastener sliding stage in the anti-screw falling structure provided by the utility model;

[0026] Figure 7 A schematic diagram of the butterfly valve intermediate pressure ring and the butterfly plate frame provided by the utility model at the stage of being connected;

[0027] Figure 8 A schematic diagram of the connection stage between the intermediate pressure ring and the butterfly plate frame of the butterfly valve provided by the utility model;

[0028] Description of reference numerals:

[0029] 1-wound gasket; 2-sealing ring; 3-flat washer; 4-fastener; 5-pressing ring; 51-first waist-shaped hole; 52-second waist-shaped hole; 53-connecting hole; 54-first limiting part; 55-second limiting part; 6-butterfly plate frame; 61-protrusion; 7-valve body; 8-valve stem. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Example

[0035] This embodiment provides a structure for preventing screws from falling off. Figures 1 to 8 The anti-screw falling-off structure includes a pressure ring 5, which is suitable for being detachably connected to the butterfly plate frame 6. At least two countersunk hole structures are arranged through the pressure ring 5. A connecting hole 53 and a limiting cavity are arranged in any countersunk hole structure. The connecting hole 53 and the limiting cavity are connected. The connecting hole 53 is suitable for the fastener 4 to pass through to connect the pressure ring 5 and the external butterfly plate frame 6. The limiting cavity is at least suitable for axially constraining the fastener 4.

[0036] In this embodiment, the fastener 4 is configured with a locking connecting rod and a head end, the locking connecting rod is provided with an external thread, the butterfly plate frame 6 is provided with an assembly hole, and the assembly hole and the locking connecting rod are conformally threaded. The fastener 4 is set as a screw, such as a hexagon socket screw.

[0037] In the specific implementation, see Figure 4 The counterbore structure further includes a first limiting portion 54, which is protrudingly arranged on the inner wall of the counterbore structure, and the connecting hole 53 is structurally arranged in the first limiting portion 54, and the limiting cavity is arranged on the side of the first limiting portion 54 close to the butterfly plate frame 6. Among them, the first limiting portion 54 can be set as a protruding structure, and the connecting hole 53 is formed inside the protruding structure. When the fastener 4 is assembled to connect the pressing ring 5 and the butterfly plate frame 6, the axial movement of the fastener 4 can be stopped and constrained by the first limiting portion 54 to prevent the fastener 4 from falling off. The first limiting portion 54 is specifically used to constrain the head end of the fastener 4.

[0038] In this embodiment, see Figure 4 The counterbore structure also includes a second limiting portion 55, which is protrudingly arranged on the inner wall of the counterbore structure, and the first limiting portion 54 and the second limiting portion 55 are arranged at intervals. Among them, the second limiting portion 55 can be set as an annular protrusion, and a second waist-shaped hole 52 is formed inside the annular protrusion; the second limiting portion 55 is set on the side of the pressure ring 5 close to the butterfly plate frame 6. When the fastener 4 is assembled to connect the pressure ring 5 and the butterfly plate frame 6, the locking connecting rod of the fastener 4 is spirally inserted into the butterfly plate frame 6, and the head end of the fastener 4 acts on the second limiting portion 55 and the butterfly plate frame 6 to be close to each other, so as to relatively fix the pressure ring 5 and the butterfly plate frame 6. The space between the first limiting portion 54 and the second limiting portion 55 is used to accommodate the head end of the fastener 4, and the first limiting portion 54 and the second limiting portion 55 jointly axially constrain the head end of the fastener 4.

[0039] In a specific embodiment, the wall surfaces of the first limiting portion 54 and the second limiting portion 55 for contacting the head end of the fastener 4 are set to be planes.

[0040] As an exemplary embodiment, see Figure 3 and Figure 4 The limiting cavity includes a first waist-shaped hole 51 and a second waist-shaped hole 52 which are connected to each other. The first waist-shaped hole 51 is arranged between the connecting hole 53 and the second waist-shaped hole 52; the first waist-shaped hole 51 is arranged between the first limiting portion 54 and the second limiting portion 55. The first waist-shaped hole 51 is suitable for accommodating the head end of the fastener 4, and the second waist-shaped hole 52 is suitable for the locking connecting rod of the fastener 4 to pass through.

[0041] In a specific embodiment, the pressing ring 5 is configured as a rotating body structure, and the first waist-shaped hole 51 and the second waist-shaped hole 52 are distributed in a ring shape on the pressing ring 5, and the central axis of the first waist-shaped hole 51 and the central axis of the second waist-shaped hole 52 are spaced and offset; in the radial cross-section of the pressing ring 5, the cross-sectional area of ​​the first waist-shaped hole 51 is larger than the cross-sectional area of ​​the second waist-shaped hole 52, and the head end of the fastener 4 can be slidably set in the first waist-shaped hole 51, and the locking connecting rod of the fastener 4 can be slidably set in the second waist-shaped hole 52, so that the fastener 4 can slide in the countersunk structure, so that the head end of the fastener 4 can be radially moved to between the first limiting portion 54 and the second limiting portion 55, so as to axially constrain the head end of the fastener 4 between the first limiting portion 54 and the second limiting portion 55. In this embodiment, see Figure 5 and Figure 6 , the head end of the fastener 4 is slidably moved in the first waist-shaped hole 51 toward the outer peripheral side of the pressure ring 5.

[0042] During specific use, the fastener 4 is first inserted through the connecting hole 53 and the first waist-shaped hole 51 in sequence to be placed in the countersunk structure; the head end of the fastener 4 is placed in the first waist-shaped hole 51, and the locking connecting rod of the fastener 4 is inserted into the second waist-shaped hole 52, and the head end of the fastener 4 is slid between the first limiting portion 54 and the second limiting portion 55, and the locking connecting rod of the fastener 4 slides correspondingly in the second waist-shaped hole 52; the connecting hole 53 on the butterfly plate frame 6 and the position of the locking connecting rod after sliding are aligned, and the head end of the fastener 4 is rotated by operating an external tool to make the locking connecting rod correspondingly screwed into the connecting hole 53 on the butterfly plate frame 6; multiple fasteners 4 are screwed into the butterfly plate frame 6 to fix the pressure ring 5 and the butterfly plate frame 6 together.

[0043] In the anti-screw falling-off structure of this embodiment, the limiting cavity adopts a waist-shaped hole design. On the one hand, it can facilitate the directional sliding and translation of the fastener 4 in the limiting cavity. On the other hand, it is beneficial for the fastener 4 to fully fit into the limiting cavity and for the limiting cavity to establish a radial constraint on the fastener 4.

[0044] It should be noted that an area is reserved at the head end of the fastener 4 for operation and rotation by an external tool, and the area is arranged to avoid the first limiting portion 54 .

[0045] The anti-screw falling-off structure provided in the present embodiment connects the pressure ring 5 to the butterfly plate frame 6 through the fastener 4 in specific usage scenarios; the fastener 4 can be axially constrained by the limiting cavity in the countersunk hole structure to prevent the fastener 4 from being disconnected under the valve vibration condition, which can effectively prevent the fastener 4 from falling off and avoid the risk of damaging other equipment on the pipeline; when the valve needs to be adjusted and repaired, the pressure ring 5 and the butterfly plate frame 6 can be quickly disassembled, and the operation and adjustment are convenient.

[0046] Of course, the anti-screw falling-off structure can be applied to the solution where two other structural members are connected by fasteners 4. By configuring a countersunk structure on one of the structural members and utilizing the limiting cavity inside the countersunk structure to constrain the fastener 4, the function of preventing the fastener 4 from falling-off is obtained.

[0047] As a further embodiment, see Figure 5 and Figure 6 The screw-off prevention structure further includes a flat washer 3, which is suitable for being sleeved on the fastener 4. The flat washer 3 and the second limiting portion 55 are arranged in abutment with each other, and the sum of the thickness of the flat washer 3 and the thickness of the head end of the fastener 4 is less than the linear distance between the first limiting portion 54 and the second limiting portion 55. By arranging the flat washer 3 to raise the head end of the fastener 4, the head end of the fastener 4 can fully fill the space in the first waist-shaped hole.

[0048] In a specific embodiment, the height of the first waist-shaped hole is slightly higher than the sum of the thickness of the head end of the fastener 4 and the thickness of the flat washer 3, for example, about the distance of 1 to 2 threads on the fastener 4 locking the connecting rod.

[0049] The utility model also provides a butterfly valve, see Figure 1 The butterfly valve includes a fastener 4 and a screw-proof structure, and the fastener 4 and the countersunk hole structure in the screw-proof structure are connected to each other correspondingly.

[0050] In this embodiment, see Figure 1 The butterfly valve further comprises a butterfly plate frame 6, a valve body 7 and a valve stem 8. The butterfly plate frame 6 is threadedly connected to the pressure ring 5 in the anti-screw falling structure through a plurality of fasteners 4. The pressure ring 5 is abutted and mounted on the lateral end surface of the butterfly plate frame 6. The butterfly plate frame 6 and the valve body 7 are sealed and connected. The butterfly plate frame 6 and the valve stem 8 are fixedly connected. The valve stem 8 and the valve body 7 are rotatably arranged. The valve stem 8 is used to connect with an external actuator to drive the butterfly plate frame 6 to open / close the flow of the butterfly valve.

[0051] In a specific embodiment, a plurality of assembly holes are provided on the butterfly plate frame 6, and the assembly holes and the countersunk hole structures are arranged correspondingly, and the plurality of assembly holes are distributed in an annular manner on the lateral end surface of the butterfly plate frame 6 facing the pressure ring 5. Specifically, the positions of the assembly holes and the fastener 4 locking connecting rod sliding in the second waist-shaped hole 52 to the working position are arranged correspondingly.

[0052] As a preferred embodiment, see Figure 8 The butterfly plate frame 6 is provided with a protrusion 61, which is set as a rotating body structure, and the outer peripheral side wall of the protrusion 61 is set in contact with the inner wall surface of the pressure ring 5. The protrusion 61 can be set as a cylindrical structure. After the pressure ring 5 and the butterfly plate frame 6 are connected and assembled by multiple fasteners 4, the protrusion 61 and the inner wall of the pressure ring 5 are connected, and the pressure ring 5 can be radially constrained by the protrusion 61; Figure 1In the figure, in the vertical direction, the pressure ring 5 can be hung on the butterfly plate frame 6 through the protrusion 61, and the pressure ring 5 and the butterfly plate frame 6 are connected and assembled through a plurality of fasteners 4 and the protrusion 61.

[0053] As a further embodiment, see Figure 7 and Figure 8 The butterfly valve further comprises a spiral wound gasket 1 and a sealing ring 2, which are sleeved on the butterfly plate frame 6, and the sealing ring 2 is arranged between the pressure ring 5 and the butterfly plate frame 6, and the spiral wound gasket 1 is arranged on the side of the sealing ring 2 away from the pressure ring 5. The sealing ring 2 seals the assembly gap between the pressure ring 5 and the butterfly plate frame 6 to prevent the circulating medium in the butterfly valve from entering the counterbore structure, so as to provide a stable working environment for the fastener 4. The spiral wound gasket 1 can play the role of elastically compressing the sealing ring 2, strengthen the sealing ability of the sealing ring 2, and improve the tightness of the connection between the pressure ring 5 and the butterfly plate frame 6.

[0054] In the butterfly valve provided in this embodiment, the fastener 4 can be configured as a self-locking and anti-loosening screw structure to improve the fastening effect of the connection between the pressure ring 5 and the butterfly plate frame 6; among the fasteners 4 connecting multiple pressure rings 5 ​​and the butterfly plate frame 6, if any of the fasteners 4 becomes loose during use, the head end of the fastener 4 is stopped by the first limit portion 54 on the pressure ring 5, so that the fastener 4 cannot fall off due to vibration conditions and fall into the pipeline, thereby ensuring the reliable use of the butterfly valve.

[0055] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A screw-preventing structure, characterized in that: include: The pressure ring (5) is suitable for being detachably connected to the butterfly plate frame (6). At least two countersunk hole structures are provided through the pressure ring (5). A connecting hole (53) and a limiting cavity are provided in any of the countersunk hole structures. The connecting hole (53) and the limiting cavity are connected. The connecting hole (53) is suitable for the fastener (4) to pass through so as to connect the pressure ring (5) and the external butterfly plate frame (6). The limiting cavity is at least suitable for axially constraining the fastener (4).

2. The screw-fall-off prevention structure according to claim 1, characterized in that: The countersunk hole structure further comprises a first limiting portion (54), wherein the first limiting portion (54) is protrudingly arranged on the inner wall of the countersunk hole structure, the connecting hole (53) is structurally arranged in the first limiting portion (54), and the limiting cavity is arranged on a side of the first limiting portion (54) close to the butterfly plate frame (6).

3. The screw-fall-off prevention structure according to claim 2, characterized in that: The countersunk hole structure further comprises a second limiting portion (55), wherein the second limiting portion (55) is protrudingly arranged on the inner wall of the countersunk hole structure, and the first limiting portion (54) and the second limiting portion (55) are arranged at intervals.

4. The screw-fall-off prevention structure according to claim 3, characterized in that: The limiting cavity comprises a first waist-shaped hole (51) and a second waist-shaped hole (52) which are connected to each other, wherein the first waist-shaped hole (51) is arranged between the connecting hole (53) and the second waist-shaped hole (52); the first waist-shaped hole (51) is arranged between the first limiting portion (54) and the second limiting portion (55), the first waist-shaped hole (51) is suitable for accommodating the head end of the fastener (4), and the second waist-shaped hole (52) is suitable for the fastener (4) to pass through.

5. The screw-fall-off prevention structure according to claim 4, characterized in that: The pressure ring (5) is configured as a rotating body structure, the first waist-shaped hole (51) and the second waist-shaped hole (52) are distributed in a ring shape on the pressure ring (5), and the central axis of the first waist-shaped hole (51) and the central axis of the second waist-shaped hole (52) are spaced and offset from each other; in the radial cross section of the pressure ring (5), the cross-sectional area of ​​the first waist-shaped hole (51) is larger than the cross-sectional area of ​​the second waist-shaped hole (52).

6. The screw-fall-off prevention structure according to claim 3, characterized in that: The anti-screw falling structure also includes a flat washer (3), which is suitable for being sleeved on the fastener (4), and the flat washer (3) and the second limiting portion (55) are arranged in abutment with each other, and the sum of the thickness of the flat washer (3) and the thickness of the head end of the fastener (4) is smaller than the straight-line distance between the first limiting portion (54) and the second limiting portion (55).

7. A butterfly valve, characterized in that: It comprises a fastener (4) and the anti-screw falling-off structure according to any one of claims 1 to 6, wherein the fastener (4) and the countersunk hole structure in the anti-screw falling-off structure are arranged correspondingly and in connection.

8. The butterfly valve according to claim 7, characterized in that: The butterfly valve also includes a butterfly plate frame (6), a valve body (7) and a valve stem (8); the butterfly plate frame (6) is threadedly connected to the pressure ring (5) in the anti-screw falling structure through a plurality of fasteners (4); the pressure ring (5) is abutted against the lateral end surface of the butterfly plate frame (6); the butterfly plate frame (6) and the valve body (7) are sealed and connected; the butterfly plate frame (6) and the valve stem (8) are fixedly connected; and the valve stem (8) and the valve body (7) are rotatably configured.

9. The butterfly valve according to claim 8, characterized in that: The butterfly plate frame (6) is provided with a plurality of assembly holes, and the assembly holes and the countersunk hole structures are arranged correspondingly; and / or The butterfly plate frame (6) is provided with a raised portion, the raised portion is arranged as a rotating body structure, and the outer peripheral side wall of the raised portion and the inner wall surface of the pressure ring (5) are arranged to abut against each other.

10. The butterfly valve according to claim 8, characterized in that: The butterfly valve further comprises a wound gasket (1) and a sealing ring (2), wherein the wound gasket (1) and the sealing ring (2) are sleeved on a butterfly plate frame (6), the sealing ring (2) is arranged in contact between the pressure ring (5) and the butterfly plate frame (6), and the wound gasket (1) is arranged on a side of the sealing ring (2) away from the pressure ring (5).

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