Sealing limiting structure and butterfly valve

Abstract

The utility model discloses a sealing limiting structure and a butterfly valve, and relates to the field of butterfly valves. The sealing limiting structure comprises a valve body, a valve plate assembly and a limiting piece. The valve body is provided with a runner opening wall face and a stop wall face. The valve plate assembly comprises a support and a sealing piece. When the flow channel opening of the valve body needs to be sealed and closed, the external transmission chain drives the support of the valve plate assembly to move, the sealing piece abuts against the wall face of the flow channel opening in a sealed mode, and therefore the purpose of closing the flow channel of the valve body is achieved. The limiting piece is in contact with the stop wall face for limiting, so that the deformation degree of the sealing piece abutting against the wall face of the flow channel opening is limited, and the sealing control capacity of the valve is enhanced; compared with the mode that a limiting block is welded in the valve body to limit the valve plate, the sealing device is good in actual operation flexibility, and it can be effectively guaranteed that the sealing piece is located at the reliable sealing work position; the sealing and limiting structure of the valve is optimized, the production and manufacturing requirements are reduced, the product performance requirements are improved, and the sealing performance of the valve can be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to butterfly valve field, concretely relates to a sealing limiting structure and butterfly valve. BACKGROUND

[0002] With more and more valve application in the specialized use requirement occasion, especially for the medium working condition with toxicity, pollution and other strict use conditions, the sealing performance and service life requirement of valve are higher, and the control precision of valve sealing position is the core factor influencing valve sealing.

[0003] To avoid that the valve sealing is excessive and causes the damage of sealing member, for example, excessive torque can cause the deformation or damage of sealing member, and the valve leaks, the limiting structure can be arranged in the valve to realize the stop positioning of valve sealing position, for example, the butterfly valve, in the related art, the limiting block is welded in the valve body, the sealing member is installed on the valve plate, when the valve plate closes the sealing flow channel, the sealing member moves and abuts against the closed flow channel with the valve plate, and the limiting block is used to limit the valve plate, thereby avoiding that the sealing member on the valve plate is sealed excessively, and the valve is closed excessively. But this kind of way, the operator needs to weld the limiting block in the valve body, the actual operation requirement is high, the processing error is easy to produce, and the effective position of the limiting sealing member is difficult to guarantee. UTILITY MODEL CONTENTS

[0004] Therefore, in the first aspect, the utility model provides a sealing limiting structure, which comprises:

[0005] The valve body has a flow channel port wall surface and a stop wall surface;

[0006] The valve plate assembly comprises a bracket and a sealing member, the bracket is suitable for being connected with an external transmission chain transmission, the bracket is rotationally arranged with the valve body, and the sealing member is fixedly installed on the bracket;

[0007] At least one limiting member is installed on the bracket, and the stop wall surface is arranged on the path of the limiting member closing the internal flow channel port of the valve body with the bracket;

[0008] In the movement stroke of the limiting member towards the stop wall surface by rotating the valve plate assembly, the valve plate assembly has a sealing position for sealingly abutting the sealing member and the flow channel port wall surface to close the internal flow channel port of the valve body, and a limiting position for contacting and limiting the limiting member and the stop wall surface, and the limiting position is suitable for limiting the deformation degree of the abutment of the sealing member and the flow channel port wall surface.

[0009] The sealing and limiting structure provided by the utility model is characterized in that the limiting piece is arranged on the support of the valve plate assembly, when it is necessary to seal and close the flow channel opening of the valve body, the support of the valve plate assembly is moved by the external transmission chain, the sealing piece is sealed and abuts against the wall surface of the flow channel opening, so that the flow channel of the valve body is closed; in order to avoid that the sealing piece on the valve plate assembly is sealed excessively and the valve is closed excessively, the limiting piece is limited by the contact with the stop wall surface, so that the deformation degree of the abutment between the sealing piece and the wall surface of the flow channel opening is limited, in this way, the sealing control ability of the valve is strengthened; compared with the mode that the limiting block is welded in the valve body to limit the valve plate, the utility model has good actual operation flexibility, and the sealing piece can be effectively ensured to be in a reliable sealing working position; the utility model optimizes the sealing and limiting structure of the valve, reduces the production and manufacturing requirements, improves the product performance requirements, and can ensure the sealing performance of the valve.

[0010] In some embodiments, the support comprises a fixed part and an extension part, the fixed part and the extension part are fixedly connected, the extension part extends in a direction away from the fixed part and towards the inner wall of the valve body, and the limiting piece is installed on the extension part.

[0011] The sealing and limiting structure provided by the utility model is characterized in that the sealing and limiting structure provided by the utility model is characterized in that the limiting piece is arranged on the support of the valve plate assembly, when it is necessary to seal and close the flow channel opening of the valve body, the support of the valve plate assembly is moved by the external transmission chain, the sealing piece is sealed and abuts against the wall surface of the flow channel opening, so that the flow channel of the valve body is closed; in order to avoid that the sealing piece on the valve plate assembly is sealed excessively and the valve is closed excessively, the limiting piece is limited by the contact with the stop wall surface, so that the deformation degree of the abutment between the sealing piece and the wall surface of the flow channel opening is limited, in this way, the sealing control ability of the valve is strengthened; compared with the mode that the limiting block is welded in the valve body to limit the valve plate, the utility model has good actual operation flexibility, and the sealing piece can be effectively ensured to be in a reliable sealing working position; the utility model optimizes the sealing and limiting structure of the valve, reduces the production and manufacturing requirements, improves the product performance requirements, and can ensure the sealing performance of the valve.

[0012] In some embodiments, the valve plate assembly further comprises a butterfly plate, the butterfly plate is adapted to be connected with the external transmission chain transmission, the support is arranged on one side end surface of the butterfly plate, the fixed part and the butterfly plate are fixedly connected, and the sealing piece is sleeved on the butterfly plate and the support.

[0013] The sealing and limiting structure provided by the utility model is characterized in that the sealing and limiting structure provided by the utility model is characterized in that the limiting piece is arranged on the support of the valve plate assembly, when it is necessary to seal and close the flow channel opening of the valve body, the support of the valve plate assembly is moved by the external transmission chain, the sealing piece is sealed and abuts against the wall surface of the flow channel opening, so that the flow channel of the valve body is closed; in order to avoid that the sealing piece on the valve plate assembly is sealed excessively and the valve is closed excessively, the limiting piece is limited by the contact with the stop wall surface, so that the deformation degree of the abutment between the sealing piece and the wall surface of the flow channel opening is limited, in this way, the sealing control ability of the valve is strengthened; compared with the mode that the limiting block is welded in the valve body to limit the valve plate, the utility model has good actual operation flexibility, and the sealing piece can be effectively ensured to be in a reliable sealing working position; the utility model optimizes the sealing and limiting structure of the valve, reduces the production and manufacturing requirements, improves the product performance requirements, and can ensure the sealing performance of the valve.

[0014] In some embodiments, the valve plate assembly further comprises a pressure ring, the pressure ring is fixedly connected with the butterfly plate, the support is provided with an installation part, the installation part is arranged on one side of the support adjacent to the pressure ring, and the installation part and the axial end surface of the pressure ring jointly limit the installation of the sealing piece.

[0015] The sealing and limiting structure provided by the utility model is assembled with a sealing element by a pressing ring, a butterfly plate and a support, the mounting portion on the support and the axial end face of the pressing ring jointly limit and clamp the sealing element, and the sealing element can be guaranteed to be in the expected installation area; when the valve is closed, the sealing element is sealed and abuts against the flow passage port wall face.

[0016] In some embodiments, the limiting member is provided as a limiting screw, a threaded hole is provided through the extension portion, and the limiting screw is threadedly self-locked with the threaded hole.

[0017] The sealing and limiting structure provided by the utility model is assembled with a sealing element by a pressing ring, a butterfly plate and a support, the mounting portion on the support and the axial end face of the pressing ring jointly limit and clamp the sealing element, and the sealing element can be guaranteed to be in the expected installation area; when the valve is closed, the sealing element is sealed and abuts against the flow passage port wall face.

[0018] In some embodiments, the stop wall face is arranged on the path of all the limiting members closing the flow passage port inside the valve body.

[0019] The sealing and limiting structure provided by the utility model is assembled with a sealing element by a pressing ring, a butterfly plate and a support, the mounting portion on the support and the axial end face of the pressing ring jointly limit and clamp the sealing element, and the sealing element can be guaranteed to be in the expected installation area; when the valve is closed, the sealing element is sealed and abuts against the flow passage port wall face.

[0020] In some embodiments, the flow passage port wall face is provided as a conical sealing surface, and the sealing element is provided as a sealing ring, and a conical sealing end face that is conformally arranged with the conical sealing surface is arranged on the outer circumferential side of the sealing ring.

[0021] In some embodiments, the valve body is internally provided with a protruding ring, the flow passage port of the valve body is formed in the protruding ring, the inner circumferential wall face of the protruding ring is at least partially provided as the flow passage port wall face, and the lateral wall face of the protruding ring towards the limiting member is at least partially provided as the stop wall face.

[0022] The sealing and limiting structure provided by the utility model is assembled with a sealing element by a pressing ring, a butterfly plate and a support, the mounting portion on the support and the axial end face of the pressing ring jointly limit and clamp the sealing element, and the sealing element can be guaranteed to be in the expected installation area; when the valve is closed, the sealing element is sealed and abuts against the flow passage port wall face.

[0023] In some embodiments, a safety gap H is arranged between the stop wall face and the limiting member at the sealing position.

[0024] The sealing and limiting structure provided by the utility model has a safety gap, which is beneficial to guarantee the full sealing of the valve.

[0025] In some embodiments, an adjusting part is arranged at one end of the limiting part away from the stop wall, and the adjusting part is used to adjust the relative position of the limiting part and the support.

[0026] In some embodiments, the sealing and limiting structure further comprises a locking assembly, the locking assembly comprises a first locking nut and a second locking nut, either locking nut is sleeved on the limiting part, the outer wall of the limiting part has a threaded section, the first locking nut and the second locking nut are arranged in an opposite abutting structure, and the first locking nut is in abutting limiting connection with the support.

[0027] The sealing and limiting structure provided by the utility model has a safety gap, which is beneficial to guarantee the full sealing of the valve.

[0028] In the second aspect, the utility model further provides a butterfly valve comprising the sealing and limiting structure. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 It is a partial cross-sectional schematic view of the sealing and limiting structure provided by the utility model.

[0031] Figure 2 It is a structural schematic view of the valve body in the sealing and limiting structure provided by the utility model.

[0032] Figure 3 It is a connection schematic view of the sealing and limiting structure provided by the utility model in the sealing stage.

[0033] Figure 4 The assembly schematic view of the support in the sealing and limiting structure is provided.

[0034] Mark explanation:

[0035] 1, valve body; 101, flow passage port wall surface; 102, stop wall surface; 103, protruding ring;

[0036] 201, support; 2011, fixed part; 2012, extension part; 2013, mounting part; 202, sealing element; 203, compression ring; 204, butterfly plate;

[0037] 3, limiting element; 401, first locking nut; 402, second locking nut. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not 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.

[0039] In the description of the present application, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0042] EMBODIMENT

[0043] The present embodiment provides a sealing and limiting structure, such asFigures 1 to 4 As shown, the sealing and limiting structure includes a valve body 1, a valve plate assembly, and a limiting member 3. The valve body 1 has a flow channel wall 101 and a stop wall 102.

[0044] like Figure 1 As shown, the valve plate assembly includes a bracket 201 and a seal 202. The bracket 201 is adapted to be connected to an external drive chain. The bracket 201 is rotatably configured with respect to the valve body 1, and the seal 202 is fixedly mounted on the bracket 201. The external drive chain can be configured as an actuating mechanism and a valve stem. The valve stem is connected to the actuating end of the actuating mechanism, and the valve stem is fixedly configured with respect to the valve plate assembly.

[0045] There may be one or more limiting components 3. Taking the setting of one limiting component 3 as an example, the limiting component 3 is installed on the bracket 201, and the stop wall 102 is set on the path of the limiting component 3 as the bracket 201 closes the internal flow channel of the valve body 1.

[0046] In this embodiment, during the movement of the valve plate assembly rotating to move the limiting member 3 toward the stop wall 102, the valve plate assembly has a sealing position that seals the sealing member 202 against the flow channel wall 101 to close the internal flow channel of the valve body 1, and a limiting position that limits the contact between the limiting member 3 and the stop wall 102. The limiting position is suitable for limiting the degree of deformation of the sealing member 202 against the flow channel wall 101.

[0047] The sealing and limiting structure provided in this embodiment assembles the limiting member 3 on the bracket 201 of the valve plate assembly. When it is necessary to seal and close the flow channel of the valve body 1, the external transmission chain drives the bracket 201 of the valve plate assembly to move, and the sealing member 202 seals and abuts against the flow channel wall 101 to achieve the purpose of closing the flow channel of the valve body 1. In order to avoid the sealing member 202 on the valve plate assembly from over-sealing and the valve from over-closing, the limiting member 3 contacts and limits the stop wall 102 to limit the deformation of the sealing member 202 against the flow channel wall 101. This method enhances the sealing control capability of the valve. Compared with the method of welding the limiting block to limit the valve plate in the valve body 1, this utility model has better operational flexibility and can effectively ensure that the sealing member 202 is in a reliable sealing working position. This utility model optimizes the sealing and limiting structure of the valve, reduces the manufacturing requirements, improves the product performance requirements, and can guarantee the valve sealing performance.

[0048] In some implementations, such as Figure 2 As shown, a raised ring 103 is provided inside the valve body 1. A flow channel opening of the valve body 1 is formed inside the raised ring 103. At least a portion of the inner peripheral wall of the raised ring 103 is configured as the flow channel opening wall 101, and at least a portion of the lateral wall of the raised ring 103 facing the limiting member 3 is configured as a stop wall 102.

[0049] By the technical scheme, the flow channel port of the valve is established by the protruding ring 103 in the valve body 1, the valve plate assembly is driven to rotate to close to the flow channel port under the action of the external transmission chain, the flow channel port wall surface 101 and the stop wall surface 102 are formed on the protruding ring 103, so that the flow channel port wall surface 101 abuts against and seals the sealing element 202, and the stop wall surface 102 abuts against and limits the limiting element 3; in this way, the stop wall surface 102 is directly formed on the protruding ring 103 in the manufacturing stage of the valve body 1, which reduces the production and manufacturing requirements, improves the product performance requirements, fully optimizes the sealing and limiting structure of the valve, and can guarantee the sealing performance of the valve.

[0050] In some embodiments, as shown in Figure 3 The bracket 201 includes a fixed part 2011 and an extension part 2012, the fixed part 2011 and the extension part 2012 are fixedly connected, the extension part 2012 extends away from the fixed part 2011 and towards the inner wall of the valve body 1, and the limiting element 3 is installed on the extension part 2012. In this way, the extension part 2012 is arranged on the bracket 201 and extends towards the inner wall of the valve body 1, so that the limiting element 3 installed on the extension part 2012 can be aligned with the stop wall surface 102, thereby establishing an effective limiting position when the valve plate assembly moves, and guaranteeing the reliable sealing of the sealing element 202.

[0051] In some embodiments, as shown in Figure 3 and Figure 4 The valve plate assembly further includes a butterfly plate 204, the butterfly plate 204 is adapted to be driven by the external transmission chain, the bracket 201 is arranged on one side end surface of the butterfly plate 204, the fixed part 2011 and the butterfly plate 204 are fixedly connected, and the sealing element 202 is sleeved on the butterfly plate 204 and the bracket 201. The bracket 201 and the installation area of the sealing element 202 are arranged on the butterfly plate 204, the butterfly plate 204 is driven by the external transmission chain to drive the bracket 201, the sealing element 202 and the limiting element 3 to rotate together, so that the sealing element 202 in the valve plate assembly abuts against and seals the flow channel port wall surface 101 to form a sealing position, and the limiting element 3 contacts and limits the stop wall surface 102 to form a limiting position.

[0052] In some embodiments, as shown in Figure 1As shown, the valve plate assembly further comprises a pressing ring 203 fixedly connected with the butterfly plate 204, and the bracket 201 is provided with a mounting portion 2013 arranged on the side of the bracket 201 adjacent to the pressing ring 203, and the mounting portion 2013 and the axial end surface of the pressing ring 203 jointly limit the installation of the sealing element 202. The sealing element 202 is assembled by the pressing ring 203, the butterfly plate 204 and the bracket 201, and the mounting portion 2013 on the bracket 201 and the axial end surface of the pressing ring 203 jointly limit and clamp the sealing element 202, so that the sealing element 202 can be guaranteed to be in the desired installation area; when the valve is closed, the sealing element 202 is in sealing abutment with the flow passage port wall surface 101.

[0053] In some embodiments, as Figure 1 As shown, a safety gap H is arranged between the stop wall surface 102 and the limiting piece 3 in the sealing position. By reserving the safety gap, the valve plate assembly can first fully seal the flow passage port, the sealing element 202 is deformed and pressed with the flow passage port wall surface 101 to form an effective seal to close the valve; when the valve plate assembly continues to move and causes the valve to be excessively opened, the limiting piece 3 contacts and limits the stop wall surface 102 to prevent the sealing element 202 from being excessively sealed; this kind of arrangement with a safety gap is beneficial to guarantee the full sealing of the valve.

[0054] In specific embodiments, the flow passage port wall surface 101 can be provided as a soft sealing structure or a hard sealing structure, and the sealing element 202 is provided as an elastic sealing structure.

[0055] In specific embodiments, the flow passage port wall surface 101 is provided as a conical sealing surface, and the sealing element 202 is provided as a sealing ring, and the outer peripheral side of the sealing ring is provided with a conical sealing end surface which is conformally arranged with the conical sealing surface.

[0056] In some embodiments, the limiting piece 3 is provided as a limiting screw, and a threaded hole is arranged through the extension portion 2012, and the limiting screw is threadedly and self-locked connected with the threaded hole.

[0057] The sealing and limiting structure provided by the utility model, the limiting piece 3 is specifically provided as a limiting screw, and the limiting screw is threadedly and self-locked connected with the threaded hole of the extension portion 2012; this kind of arrangement can flexibly adjust the installation position of the limiting piece 3 to adjust the distance between the limiting piece 3 and the stop wall surface 102, so that the limiting position of the valve plate assembly can be matched with the sealing position.

[0058] In some embodiments, an adjusting portion is arranged at the end of the limiting piece 3 away from the stop wall surface 102, and the adjusting portion is used for adjusting the relative position of the limiting piece 3 and the bracket 201. In specific embodiments, the relative position of the limiting piece 3 and the bracket 201 can be adjusted by the adjusting portion to realize the adjustment of the safety gap H; the adjusting portion is provided as an adjusting hole, for example, an inner hexagonal groove at the small head end of the limiting screw.

[0059] In some embodiments, the sealing and limiting structure further comprises a locking assembly, such as Figure 3 As shown, the locking assembly comprises a first locking nut 401 and a second locking nut 402, either of which is sleeved on the limiting piece 3, and the limiting piece 3 has a threaded segment on the outer wall surface, the first locking nut 401 and the second locking nut 402 are arranged in a butt structure, and the first locking nut 401 is limitedly abutted with the support 201.

[0060] The sealing and limiting structure provided by the utility model has the advantages that the limiting piece 3 is fixedly installed on the support 201 through the locking assembly, the first locking nut 401 is limitedly abutted with the support 201, the first locking nut 401 and the second locking nut 402 are respectively screwed with the limiting piece 3, and the first locking nut 401 and the second locking nut 402 form a butt structure, so that the double nuts are used to prevent loosening, the assembly precision and reliability of the limiting piece 3 are ensured, and an effective limiting position is established.

[0061] In some embodiments, the stop wall surface 102 is arranged on the path of all the limiting pieces 3 closing the flow passage opening in the valve body 1 along with the support 201.

[0062] The limiting piece 3 is provided with more than one, and when the valve is closed and sealed, the stop wall surface 102 is abutted and limited with all the limiting pieces 3, so that the sealing of the sealing element 202 is prevented from being excessive, and the phenomenon of over-closing of the valve is avoided.

[0063] Taking the case that the limiting piece 3 is provided with two, the two limiting pieces 3 can be commonly installed on the same support 201, and at the limiting position, the two limiting pieces 3 are synchronously abutted with the stop wall surface 102. Of course, in other embodiments, the support 201 can be provided with multiple, and the limiting piece 3 is arranged on each support 201, and at the limiting position, all the limiting pieces 3 on each support 201 are synchronously abutted with the stop wall surface 102.

[0064] The sealing and limiting structure provided by the utility model has the advantages that the limiting piece 3 is fixedly installed on the support 201 through the locking assembly, the first locking nut 401 is limitedly abutted with the support 201, the first locking nut 401 and the second locking nut 402 are respectively screwed with the limiting piece 3, and the first locking nut 401 and the second locking nut 402 form a butt structure, so that the double nuts are used to prevent loosening, the assembly precision and reliability of the limiting piece 3 are ensured, and an effective limiting position is established.

[0065] When the valve plate assembly is rotated to close the valve, the external transmission chain drives the valve plate assembly to lean against the flow passage opening wall surface 101 of the valve body 1, the sealing element 202 is abutted and sealed with the flow passage opening wall surface 101, both have a set sealing specific pressure, the effective sealing and closing of the valve are ensured, the limiting piece 3 installed on the support 201 is contacted with the stop wall surface 102 to prevent the sealing element 202 from continuing to rotate with the valve plate assembly, and the continuous rotation of the valve plate assembly is avoided; meanwhile, a safety gap H is reserved between the limiting piece 3 and the stop wall surface 102, and the limiting piece 3 is adjusted through the adjusting part.

[0066] The sealing and limiting structure is simple in mounting mode, and can reduce the operation ability requirement of an operator; the limiting safety gap H value can be accurately adjusted and is not affected by external factors such as welding.

[0067] The embodiment also provides a butterfly valve comprising the sealing and limiting structure.

[0068] Certainly, the sealing and limiting structure can also be applied to other valves, and is not limited to the butterfly valve.

[0069] Obviously, the above embodiment is only an example for clearly illustrating, and is not a limitation to the embodiment. Other different forms of changes or variations can be made on the basis of the above description for ordinary skilled in the art. Here, all the embodiments are not required to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A seal stop structure, characterized by, The utility model relates to a valve body (1) with a flow channel port wall surface (101) and a stop wall surface (102), a valve plate assembly including a bracket (201) adapted to be driven by an external driving chain and a sealing element (202) fixedly installed on the bracket (201), at least one limiting element (3) installed on the bracket (201) and arranged on the path of the limiting element (3) closing the internal flow channel port of the valve body (1) along with the bracket (201), wherein, in the movement stroke of the valve plate assembly towards the stop wall surface (102), the valve plate assembly has a sealing position in which the sealing element (202) is in sealing abutment with the flow channel port wall surface (101) to close the internal flow channel port of the valve body (1) and a limiting position in which the limiting element (3) is in contact with the stop wall surface (102) to limit the deformation degree of the sealing element (202) in abutment with the flow channel port wall surface (101). The bracket (201) includes a fixed portion (2011) and an extension portion (2012), the fixed portion (2011) and the extension portion (2012) are fixedly connected, the extension portion (2012) extends away from the fixed portion (2011) towards the inner wall of the valve body (1), and the limiting element (3) is installed on the extension portion (2012). The valve plate assembly further includes a butterfly plate (204) adapted to be driven by an external driving chain, the bracket (201) is arranged on one side end surface of the butterfly plate (204), the fixed portion (2011) and the butterfly plate (204) are fixedly connected, and the sealing element (202) is sleeved on the butterfly plate (204) and the bracket (201). The valve plate assembly further includes a compression ring (203) fixedly connected with the butterfly plate (204), the bracket (201) is provided with a mounting portion (2013), the mounting portion (2013) is arranged on the side of the bracket (201) adjacent to the compression ring (203), and the mounting portion (2013) and the axial end surface of the compression ring (203) jointly limit the installation of the sealing element (202). The limiting element (3) is a limiting screw, the extension portion (2012) is provided with a threaded hole penetrating therethrough, and the limiting screw is threadedly and self-locked connected with the threaded hole.

2. The seal stop structure of claim 1, wherein, The stop wall surface (102) is arranged on the path of all the limiting elements (3) closing the internal flow channel port of the valve body (1) along with the bracket (201).

3. The seal stop structure of claim 2, wherein, The flow channel port wall surface (101) is a conical sealing surface, and the sealing element (202) is a sealing ring provided with a conical sealing end surface conforming to the conical sealing surface on the outer circumferential side.

4. The seal stop structure of claim 3, wherein, ​ 5. The seal stop structure of claim 2, wherein, ​ 6. The seal stop structure of claim 1, wherein, ​ 7. The seal stop structure of claim 1, wherein, ​ 8. The seal stop structure of any of claims 1-7, wherein, The valve body (1) is internally provided with a protruding ring (103), a flow channel opening of the valve body (1) is formed in the protruding ring (103), an inner circumferential wall surface of the protruding ring (103) is at least partially provided as the flow channel opening wall surface (101), and a lateral wall surface of the protruding ring (103) facing the limiting piece (3) is at least partially provided as the stop wall surface (102).

9. The seal stop structure of any of claims 1-7, wherein, In the sealing position, a safety gap H is arranged between the stop wall surface (102) and the limiting piece (3); and / or An adjusting portion is arranged at an end of the limiting piece (3) away from the stop wall surface (102), and the adjusting portion is used for adjusting the relative position of the limiting piece (3) and the support (201); and / or The sealing and limiting structure further comprises a locking assembly, the locking assembly comprises a first locking nut (401) and a second locking nut (402), any one of the locking nuts is sleeved on the limiting piece (3), a threaded section is arranged on an outer wall surface of the limiting piece (3), the first locking nut (401) and the second locking nut (402) are arranged in an opposite abutting structure, and the first locking nut (401) is abuttingly arranged in position with the support (201).

10. A butterfly valve, characterized by The sealing and limiting structure comprises any one of claims 1-9.

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