CN220727143U

CN220727143U - Embedded sealing butterfly valve

Info

Publication number: CN220727143U
Application number: CN202322221217.2U
Authority: CN
Inventors: 杨漫; 张瀛; 孙周武
Original assignee: Hangzhou Huixiang Electro Hydraulic Technology Development Co ltd
Current assignee: Hangzhou Huixiang Electro Hydraulic Technology Development Co ltd
Priority date: 2023-08-17
Filing date: 2023-08-17
Publication date: 2024-04-05
Anticipated expiration: 2033-08-17

Abstract

The utility model provides an embedded sealing butterfly valve which comprises a valve body, a valve plate, a sealing ring and an elastic piece, wherein the valve body is provided with a fluid channel, the valve plate is arranged in the fluid channel and used for adjusting the opening and closing states of the fluid channel, the sealing ring surrounds the inner peripheral wall surface of the fluid channel and is used for being connected between the valve plate and the valve body in a sealing mode, the axial end surface of the sealing ring is provided with a mounting groove which is annular extending along the circumferential direction of the sealing ring, the cross section of the elastic piece is U-shaped, and the elastic piece is transversely arranged in the mounting groove. According to the embedded sealing butterfly valve, the sealing ring is embedded in the valve body, and the elastic piece with the U-shaped cross section is transversely arranged in the mounting groove of the sealing ring, so that the sealing effect of the sealing ring is improved through the elastic piece.

Description

Embedded sealing butterfly valve

Technical Field

The utility model relates to the field of valves, in particular to an embedded sealing butterfly valve.

Background

The butterfly valve is also called as a flap valve, and is a regulating valve with simple structure, and is mainly used for cutting off the circulation of medium in a pipeline and/or regulating the flow of the medium in the pipeline, and a closing member (a valve clack or a butterfly plate) of the butterfly valve is a disc and rotates around a valve shaft to realize the purposes of opening, closing and/or regulating. In the related art, soft sealing is carried out between a closing member of a butterfly valve and a valve body through an O-shaped ring, and the sealing effect is poor.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the utility model provides an embedded sealing butterfly valve, wherein a sealing ring is embedded in a valve body of the embedded sealing butterfly valve, and an elastic piece with a U-shaped cross section is transversely arranged in a mounting groove of the sealing ring, so that the sealing effect of the sealing ring is improved through the elastic piece.

The embedded sealing butterfly valve of the embodiment of the utility model comprises:

the valve body is provided with a fluid channel;

the valve plate is arranged in the fluid channel and used for adjusting the opening degree and the opening and closing state of the fluid channel;

the sealing ring surrounds the inner peripheral wall surface of the fluid channel and is used for being connected between the valve plate and the valve body in a sealing mode, an installation groove is formed in the axial end face of the sealing ring, and the installation groove is annular and extends along the circumferential direction of the sealing ring;

the cross section of the elastic piece is U-shaped, and the elastic piece is transversely arranged in the mounting groove.

According to the embedded sealing butterfly valve disclosed by the embodiment of the utility model, the sealing ring used for being in sealing connection with the valve plate is embedded on the inner peripheral wall surface of the fluid channel of the valve body, and the elastic piece with the U-shaped cross section is transversely arranged in the mounting groove of the sealing ring, so that the elasticity and sealing effect of the sealing ring are improved through the elastic piece, and the rotation moment of the valve plate when the opening degree and the opening and closing state of the fluid channel are regulated can be reduced.

In some embodiments, the valve body comprises:

a first sub-body having a part of the fluid passage, a first mounting groove being provided on an end face of the first sub-body, and the first mounting groove being surrounded on an inner peripheral wall surface of a part of the fluid passage;

the second sub-body, the second sub-body has another part of fluid channel, be equipped with the second mounting groove on the terminal surface of second sub-body, just the second mounting groove encircles another part on fluid channel's the interior perisporium, second sub-body detachably connects first sub-body is equipped with the one end of first mounting groove, just the second mounting groove with first mounting groove intercommunication, the sealing washer is established in the first mounting groove of intercommunication with in the second mounting groove.

In some embodiments, the in-line sealing butterfly valve further comprises a valve shaft that is threaded on the valve body and a portion of which is located within the fluid passage, the valve shaft being rotatable relative to the valve body about an axis of the valve shaft;

one end of the valve plate is arranged on the valve shaft, a protruding portion is arranged on the outer peripheral wall surface of the other end of the valve plate, the protruding portion is annular extending along the circumferential direction of the valve plate, and the protruding portion is used for abutting against the sealing ring.

In some embodiments, the seal ring has an inner peripheral wall surface and an outer peripheral wall surface, the axial end surface of the seal ring being connected between the inner peripheral wall surface and the outer peripheral wall surface, at least part of the projection of the inner peripheral wall surface and at least part of the projection of the outer peripheral wall surface being arcs protruding in a relatively distant direction in a cross section of the seal ring.

In some embodiments, the elastic member includes a bending portion and two flat plate portions, the two flat plate portions are arranged at intervals in a radial direction of the seal ring, and the bending portion is connected between the two flat plate portions.

In some embodiments, the bend abuts a bottom surface of the mounting groove.

In some embodiments, the side wall surface of the mounting groove is provided with a limiting part extending into the mounting groove, and the limiting part is propped against the flat plate part on the corresponding side.

In some embodiments, the limiting portions on two side wall surfaces of the mounting groove are relatively close to each other along the radial direction of the sealing ring, and a gap is formed between the two limiting portions.

In some embodiments, the elastic piece is a U-shaped plate, the U-shaped plate is a plurality of U-shaped plates, and the plurality of U-shaped plates are arranged at intervals along the extending direction of the mounting groove.

In some embodiments, the resilient member is a metallic U-shaped plate; and/or the sealing ring is a polytetrafluoroethylene ring.

Drawings

FIG. 1 is a front cross-sectional view of an in-line seal butterfly valve of an embodiment of the utility model;

FIG. 2 is a schematic view of the seal ring and the elastic member in an embodiment of the present utility model;

FIG. 3 is a front cross-sectional view of a seal ring and an elastomeric member in an embodiment of the utility model;

FIG. 4 is a schematic view of the arrangement of the elastic member in FIG. 2;

fig. 5 is a schematic structural view of the elastic member in fig. 4.

Reference numerals:

1. a valve body; 11. a fluid channel; 12. a first sub-valve; 13. a second sub-valve; 2. a valve plate; 21. a protruding portion; 3. a seal ring; 31. a limit part; 4. an elastic member; 41. a bending portion; 42. a flat plate portion; 5. a valve shaft; 6. a first O-ring seal; 7. and a second O-shaped sealing ring.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

An in-line seal butterfly valve according to an embodiment of the utility model is described below with reference to fig. 1-5.

As shown in fig. 1 to 5, the embedded seal butterfly valve of the embodiment of the utility model includes a valve body 1, a valve plate 2, a seal ring 3, and an elastic member 4.

The valve body 1 is provided with a fluid passage 11. The valve plate 2 is provided in the fluid passage 11 for adjusting the opening and closing states of the fluid passage 11. The sealing ring 3 surrounds the inner peripheral wall surface of the fluid channel 11 for sealing connection between the valve plate 2 and the valve body 1, and the axial end surface of the sealing ring 3 is provided with a mounting groove which is annular extending along the circumferential direction of the sealing ring 3. The cross section of the elastic piece 4 is U-shaped, and the elastic piece 4 is transversely arranged in the mounting groove.

As shown in fig. 1 to 3, the valve body 1 is provided with a fluid passage 11 penetrating the valve body 1 in the left-right direction, and the fluid passage 11 is preferably circular in cross section. The valve plate 2 is provided in the fluid passage 11 and is rotatable up and down with respect to the valve body 1 to adjust the opening and/or opening and closing states of the fluid passage 11, and preferably, the valve plate 2 has a circular shape in cooperation with the fluid passage 11. The sealing ring 3 surrounds on the inner peripheral wall surface of the fluid channel 11, the inner peripheral wall surface of the fluid channel 11 is also the inner peripheral wall surface of the valve body 1, the sealing ring 3 is used for being connected between the valve plate 2 and the valve body 1 in a sealing way, the sealing ring 3 can generate elastic deformation under the pressure action of the valve plate 2 and the valve body 1 in the rotation process of the valve plate 2, thereby playing a sealing role, the left end surface of the sealing ring 3 is provided with a mounting groove, the mounting groove is in a ring shape extending along the circumferential direction of the sealing ring 3, the elastic piece 4 with a U-shaped cross section is transversely arranged in the mounting groove so as to play a role of supporting the sealing ring 3, and the elastic piece 4 also generates elastic deformation under the pressure action of the valve plate 2 and the valve body 1 in the rotation process of the valve plate 2, and can promote the elasticity and the sealing effect of the sealing ring.

In some embodiments, the valve body 1 comprises a first sub-valve 12 and a second sub-valve 13. The first sub-valve 12 has a part of the fluid passage 11, a first mounting groove is provided on an end surface of the first sub-valve 12, and the first mounting groove surrounds an inner peripheral wall surface of a part of the fluid passage 11. The second sub-valve 13 is provided with another part of the fluid channel 11, a second mounting groove is formed in the end face of the second sub-valve 13, the second mounting groove surrounds the inner peripheral wall face of the other part of the fluid channel 11, the second sub-valve 13 is detachably connected to one end, provided with the first mounting groove, of the first sub-valve 12, the second mounting groove is communicated with the first mounting groove, and the sealing ring 3 is arranged in the communicated first mounting groove and second mounting groove.

As shown in fig. 1, the valve body 1 includes a first sub-valve 12 and a second sub-valve 13, the first sub-valve 12 having a left end portion of the fluid passage 11, a right end surface of the first sub-valve 12 being provided with a first mounting groove in the shape of a ring, and the first mounting groove being surrounded on an inner peripheral wall surface of the left end portion of the fluid passage 11.

The second sub-valve 13 is arranged on the right side of the first sub-valve 12, the left end face of the second sub-valve 13 is propped against the right end face of the first sub-valve 12, a second O-shaped sealing ring 7 is arranged between the right end face of the first sub-valve 12 and the left end face of the second sub-valve 13, the second O-shaped sealing ring 7 surrounds the periphery of the fluid channel 11 to play a role in sealing between the first sub-valve 12 and the second sub-valve 13, and fluid in the fluid channel 11 is prevented from overflowing from between the first sub-valve 12 and the second sub-valve 13, and preferably, the first sub-valve 12 and the second sub-valve 13 are detachably connected through screws.

The second sub valve 13 has the right end portion of the fluid passage 11, the left end face of the second sub valve 13 is provided with an annular second mounting groove, and the second mounting groove surrounds on the inner peripheral wall surface of the right end portion of the fluid passage 11, and simultaneously, the second mounting groove is communicated with the first mounting groove, the sealing ring 3 is arranged in the communicated first mounting groove and second mounting groove, and the inner periphery of the sealing ring 3 protrudes from the communicated first mounting groove and second mounting groove for abutting against the valve plate 2.

The first and second installation grooves provided in communication are used to provide the seal ring 3 on the inner peripheral wall surface of the fluid passage 11, while the first and second sub-valves 12 and 13 are detachably connected to enable easy installation and replacement of the seal ring 3.

It will be appreciated that the structure of the valve body is not limited to including a first sub-valve and a second sub-valve, and in other embodiments, the valve body is a unitary structure.

In some embodiments, the embedded sealing butterfly valve of the embodiments of the present utility model further includes a valve shaft 5, where the valve shaft 5 is disposed on the valve body 1 in a penetrating manner, and a portion of the valve shaft 5 is located in the fluid channel 11, and the valve shaft 5 is rotatable relative to the valve body 1 about an axial direction of the valve shaft 5. One end of the valve plate 2 is provided on a portion of the valve shaft 5, and an outer peripheral wall surface of the other end of the valve plate 2 has a projection 21, the projection 21 being annular extending in a circumferential direction of the valve plate 2, the projection 21 being for abutting against the seal ring 3.

As shown in fig. 1, the valve shaft 5 extends in the up-down direction and is inserted on the second sub-valve 13, the inner peripheral wall surface of the lower end of the second sub-valve 13 is provided with a slot to insert the lower end of the valve shaft 5, the upper end of the second sub-valve 13 is provided with a through hole for the passage of the valve shaft 5, the wall surface of the through hole is provided with a first O-shaped sealing ring 6, and the first O-shaped sealing ring 6 is sleeved on the outer peripheral surface of the valve shaft 5 to play a sealing role, so that the fluid in the fluid channel 11 is prevented from overflowing from the through hole.

The right end of the valve plate 2 is disposed on a portion of the valve shaft 5 located in the fluid channel 11 by a screw, the outer circumferential surface of the left end of the valve plate 2 is provided with a protruding portion 21, the protruding portion 21 is annular extending along the circumferential direction of the valve plate 2 and is used for abutting against the inner circumferential wall surface of the sealing ring 3, preferably, the cross section of the valve plate 2 is trapezoid, and the acute angle end of the trapezoid is the protruding portion 21, it will be understood that in other embodiments, the outer circumferential surface of the valve plate 2 may also be stepped.

The valve shaft 5 can rotate up and down relative to the valve body 1, so as to drive the valve plate 2 to rotate up and down in the fluid channel 11 to adjust the opening and/or opening and closing states of the fluid channel 11, and when the valve plate 2 closes the fluid channel 11, the sealing ring 3 is connected between the outer peripheral wall surface of the valve plate 2 and the inner peripheral wall surface of the valve body 1 to play a sealing role. The valve shaft 5 can be connected with a rotating motor and a hand wheel at the outer part of the valve body 1.

In some embodiments, the seal ring 3 has an inner peripheral wall surface and an outer peripheral wall surface, the axial end surface of the seal ring 3 being connected between the inner peripheral wall surface and the outer peripheral wall surface, at least part of the projection of the inner peripheral wall surface and at least part of the projection of the outer peripheral wall surface being an arc protruding in a relatively distant direction in a cross section of the seal ring 3.

As shown in fig. 1 and 3, the seal ring 3 has an inner peripheral wall surface and an outer peripheral wall surface, both of which are annular in the left-right direction, the outer peripheral wall surface is provided on the outer periphery of the inner peripheral wall surface, the axial end surface of the seal ring 3 is connected between the inner peripheral wall surface and the outer peripheral wall surface, the inner peripheral wall surface of the seal ring 3 is for abutting against the convex portion 21 of the valve plate 2, and the outer peripheral wall surface is provided in the first mounting groove and the second mounting groove which are communicated and abuts against the groove bottom surfaces of the first mounting groove and the second mounting groove.

On the cross section of the seal ring 3, the left end of the projection of the inner peripheral wall surface and the left end of the projection of the outer peripheral wall surface are straight lines extending in the left-right direction, the rest of the projection of the inner peripheral wall surface except the left end is an arc, the rest of the projection of the outer peripheral wall surface except the left end is an arc, and the arc portion of the projection of the inner peripheral wall surface and the arc portion of the projection of the outer peripheral wall surface are projected in a relatively far direction so as to reduce the rotation moment of the valve plate 2 when the opening and opening/closing states of the fluid passage 11 are adjusted.

It will be appreciated that the projection of the inner and outer peripheral wall surfaces of the seal ring is not limited to being an arc, and in other embodiments, the projection of the inner and outer peripheral wall surfaces of the seal ring is a straight line extending in the left-right direction.

In some embodiments, the elastic member 4 includes a bending portion 41 and two flat plate portions 42, the two flat plate portions 42 being arranged at intervals in the radial direction of the seal ring 3, the bending portion 41 being connected between the two flat plate portions 42.

As shown in fig. 1 to 5, the elastic member 4 includes a curved portion 41 and two flat plate portions 42, the flat plate portions 42 extending in the left-right direction and being arranged at intervals in the radial direction of the seal ring 3, the curved portion 41 being connected between right ends of the two flat plate portions 42 so that the elastic member 4 has a U-shaped cross section. The elastic piece 4 is transversely arranged in the mounting groove, namely, the two flat plate parts 42 are arranged at intervals in the radial direction of the sealing ring 3, in the rotation process of the valve plate 2, the left ends of the two flat plate parts 42 relatively move close to each other under the pressure action of the valve plate 2 and the valve body 1, and relatively move away from each other to reset when the pressure action disappears, so that the elasticity and the sealing effect of the sealing ring 3 can be improved, and the rotation moment of the valve plate 2 when the opening and closing states of the fluid channel 11 are regulated can be reduced.

In some embodiments, the curved portion 41 abuts against the bottom surface of the mounting groove.

As shown in fig. 1 and 3, the mounting groove has two side wall surfaces, each side wall surface is an annular surface surrounding the left-right direction, one side wall surface is located on the periphery of the other side wall surface, one flat plate portion 42 of the two flat plate portions 42 abuts against one side wall surface of the mounting groove, the other flat plate portion 42 abuts against the other side wall surface of the mounting groove, and the bending portion 41 abuts against the bottom surface of the mounting groove to support the seal ring 3, so that the elasticity and the sealing effect of the seal ring 3 are improved.

It will be appreciated that the bend is not limited to abutting the bottom surface of the mounting groove, and in other embodiments the bend is located at the notch of the mounting groove.

In some embodiments, the side wall surface of the mounting groove has a limiting portion 31 extending into the mounting groove, and the limiting portion 31 abuts against the flat plate portion 42 on the corresponding side.

As shown in fig. 2 and 3, the side wall surface of the mounting groove has a limiting portion 31 extending into the mounting groove, preferably, the limiting portion 31 is located at the notch of the mounting groove, in other words, the limiting portion 31 is located at the left end of the sealing ring 3, and the limiting portion 31 abuts against the left end of the flat plate portion 42 on the corresponding side, so that the elastic member 4 is limited in the mounting groove by the limiting portion 31, and the elastic member 4 is prevented from being separated from the mounting groove when being pressed.

It is understood that the limiting portion is not limited to being provided at the notch, and in other embodiments, the limiting portion is provided at a middle portion of the side wall surface of the mounting groove in the left-right direction.

In some embodiments, the limiting portions 31 on two side wall surfaces of the mounting groove are relatively close to each other along the radial direction of the seal ring 3, and a gap is formed between the two limiting portions 31.

As shown in fig. 2 and 3, two side wall surfaces of the mounting groove are respectively provided with a limiting portion 31, wherein one limiting portion 31 is opposite to a portion of the inner peripheral wall surface projected as a straight line, the other limiting portion 31 is opposite to a portion of the outer peripheral wall surface projected as a straight line, the two limiting portions 31 are correspondingly abutted against the two flat plate portions 42 one by one so as to have a stronger limiting effect on the elastic piece 4, the two limiting portions 31 extend relatively close to each other along the radial direction of the sealing ring 3, a gap is formed between the two limiting portions 31, and when the sealing ring 3 deforms under the action of pressure, the gap between the two limiting portions 31 can provide a deformation space for deformation of the sealing ring 3.

It will be appreciated that the mounting groove is not limited to having a stop on both side walls, and in other embodiments, only one side wall of the mounting groove has a stop.

In some embodiments, the elastic member 4 is a U-shaped plate, and the U-shaped plate is a plurality of U-shaped plates, and the plurality of U-shaped plates are arranged at intervals along the extending direction of the mounting groove.

As shown in fig. 4 and 5, a plurality of elastic members 4 are provided in the mounting groove, the elastic members 4 are U-shaped plates, and the plurality of U-shaped plates are arranged at intervals along the extending direction of the mounting groove, in other words, the plurality of U-shaped plates are arranged at intervals around the left-right direction. The gap between two adjacent U-shaped plates can facilitate deformation of the sealing ring 3 and the elastic piece 4.

It will be appreciated that the structure of the resilient member is not limited to a U-shaped plate, and in other embodiments the resilient member is a ring body having a U-shaped cross-section.

In some embodiments, the elastic member 4 is a metallic U-shaped plate; and/or the sealing ring 3 is a polytetrafluoroethylene ring.

Specifically, the elastic member 4 is a metal U-shaped plate, so as to have elasticity and supporting capability, thereby improving the elasticity and sealing effect of the sealing ring 3, and reducing the rotation moment of the valve plate 2 when adjusting the opening and closing states of the fluid channel 11, and preferably, the elastic member 4 is made of stainless steel.

The sealing ring 3 is a polytetrafluoroethylene ring, so that the sealing ring has the effects of heat resistance, cold resistance, acid resistance, alkali resistance and corrosion resistance to various organic solvents, and has a lower friction coefficient, so that the corrosion resistance and the wear resistance of the sealing ring 3 are improved, and the adhesion of sediments on the sealing ring 3 can be reduced.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc. indicate or refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of describing the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between and not for indicating or implying a relative importance or an implicit indication of the number of features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims

1. An in-line seal butterfly valve, comprising:

a valve body (1), the valve body (1) being provided with a fluid channel (11);

the valve plate (2) is arranged in the fluid channel (11) and is used for adjusting the opening and closing states of the fluid channel (11);

the sealing ring (3) surrounds the inner peripheral wall surface of the fluid channel (11) and is used for being connected between the valve plate (2) and the valve body (1) in a sealing mode, an installation groove is formed in the axial end face of the sealing ring (3), and the installation groove is annular extending along the circumferential direction of the sealing ring (3);

the cross section of the elastic piece (4) is U-shaped, and the elastic piece (4) is transversely arranged in the mounting groove.

2. The in-line sealing butterfly valve according to claim 1, characterized in that the valve body (1) comprises:

a first sub-valve (12), wherein the first sub-valve (12) is provided with a part of the fluid channel (11), a first mounting groove is arranged on the end surface of the first sub-valve (12), and the first mounting groove surrounds a part of the inner peripheral wall surface of the fluid channel (11);

the second sub valve (13), second sub valve (13) have another part of fluid passageway (11), be equipped with the second mounting groove on the terminal surface of second sub valve (13), just the second mounting groove encircles another part on the inner peripheral wall of fluid passageway (11), second sub valve (13) detachably connect first sub valve (12) are equipped with the one end of first mounting groove, just the second mounting groove with first mounting groove intercommunication, sealing washer (3) are established in first mounting groove and the second mounting groove of intercommunication.

3. The in-line sealing butterfly valve according to claim 1, further comprising a valve shaft (5), the valve shaft (5) being threaded on the valve body (1) and a portion of the valve shaft (5) being located within the fluid channel (11), the valve shaft (5) being rotatable relative to the valve body (1) about an axial direction of the valve shaft (5);

one end of the valve plate (2) is arranged on a part of the valve shaft (5), a bulge (21) is arranged on the outer peripheral wall surface of the other end of the valve plate (2), the bulge (21) is annular extending along the circumferential direction of the valve plate (2), and the bulge (21) is used for abutting against the sealing ring (3).

4. The in-line seal butterfly valve according to claim 1, wherein the seal ring (3) has an inner peripheral wall surface and an outer peripheral wall surface, an axial end surface of the seal ring (3) being connected between the inner peripheral wall surface and the outer peripheral wall surface, at least part of the projection of the inner peripheral wall surface and at least part of the projection of the outer peripheral wall surface being an arc protruding in a relatively distant direction on a cross section of the seal ring (3).

5. The embedded sealing butterfly valve according to claim 1, wherein the elastic member (4) comprises a bending portion (41) and two flat plate portions (42), the two flat plate portions (42) are arranged at intervals in a radial direction of the seal ring (3), and the bending portion (41) is connected between the two flat plate portions (42).

6. The in-line sealing butterfly valve of claim 5, wherein the curved portion (41) abuts against a bottom surface of the mounting groove.

7. The embedded seal butterfly valve according to claim 5, wherein a side wall surface of the mounting groove has a stopper portion (31) extending into the mounting groove, and the stopper portion (31) abuts against the flat plate portion (42) on the corresponding side.

8. The embedded sealing butterfly valve according to claim 7, wherein the limiting portions (31) on both side wall surfaces of the mounting groove are relatively close to each other in a radial direction of the seal ring (3), and a gap is provided between both the limiting portions (31).

9. The embedded seal butterfly valve according to any one of claims 1 to 8, wherein the elastic member (4) is a U-shaped plate, the U-shaped plate is plural, and the plural U-shaped plates are arranged at intervals along the extending direction of the mounting groove.

10. The in-line sealing butterfly valve according to claim 9, characterized in that the elastic element (4) is a metallic U-plate; and/or the sealing ring (3) is a polytetrafluoroethylene ring.