Backflow-preventing bidirectional hard sealing butterfly valve

Abstract

The utility model discloses an anti-backflow bidirectional hard sealing butterfly valve which comprises a valve body, and a valve clack assembly is arranged in the valve body. The valve clack assembly comprises a valve plate and a pressing plate, and an elastic sealing ring is arranged on the valve plate; therefore, the medium is cut off and sealed. The sealing ring comprises an attaching part attached to the valve plate and a sealing part integrally formed with the attaching part. The attaching part is attached to the valve plate, and the outer circumferential face of the pressing plate is sleeved with the sealing part. And the pressing plate is connected with the valve plate, so that the sealing ring is expanded in the radial direction of the sealing ring, and the sealing part is extruded on the inner wall surface of the valve body after being pressed. Particularly, due to the arrangement of the attaching part and the sealing part, the contact area of the sealing ring and the valve body can be increased, and the sealing performance of the equipment is further improved; by means of deformation of the sealing ring and increase of the contact area of the sealing ring and the valve body, the device can effectively prevent media from leaking from the two sides of the valve clack assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely is a kind of anti-return bidirectional hard sealing butterfly valve. BACKGROUND

[0002] Butterfly valve is also called flap valve, it is a kind of regulating valve, with the progress of science and technology, butterfly valve develops fast, in each line each industry, especially large-diameter pipeline, there is the tendency of replacing gate valve, application is more and more widely.The sealing between the sealing surface of butterfly plate and valve seat is by the torque of transmission device to make butterfly plate rotate, when butterfly valve is positively pressure-bearing, the higher the pressure, the tighter the positive sealing;When valve is closed, part of medium backflows, back pressure is formed at the outlet of valve body, when butterfly plate bears back pressure, when the pressure between medium and butterfly plate is greater than the pressure between valve body and butterfly plate, backflow is generated.Therefore, how to enhance the sealing of butterfly valve under the condition that butterfly valve bears back pressure becomes the technical problem that the technical personnel in the field urgently solve. SUMMARY

[0003] The utility model is to provide a kind of anti-return bidirectional hard sealing butterfly valve to solve the problems presented in the above background technique.

[0004] To achieve the above object, the utility model provides the following technical scheme: an anti-return bidirectional hard sealing butterfly valve, including valve body, the valve body is equipped with valve flap assembly;The valve flap assembly includes valve plate and pressing plate, the valve plate is equipped with the sealing ring with elasticity;The sealing ring includes the lamination part that is attached to the valve plate and the sealing part that is integrally formed with the lamination part;The lamination part is attached to the valve plate, and the sealing part is sleeved on the outer circumferential surface of the pressing plate;The pressing plate is connected with the valve plate to promote the sealing ring to expand along its radial direction, so that the sealing part is extruded on the inner wall surface of the valve body after being pressed.

[0005] As a preferred technical scheme of the utility model: the lamination part is also equipped with first convex part on the side facing the valve plate.

[0006] As a preferred technical scheme of the utility model: the lamination part is also equipped with second convex part on the side facing the pressing plate.

[0007] As a preferred technical scheme of the utility model: the valve plate is also equipped with support part, and the sealing ring is sleeved on the support part.

[0008] As a preferred technical scheme of the utility model: the outer diameter of the pressing plate is greater than the outer diameter of the support part, and the outer diameter of the pressing plate is less than the outer diameter of the sealing ring.

[0009] As a preferred technical scheme of the utility model: it also includes bolt, the bolt is connected with the internal thread hole that is equipped on the support part after passing through the pressing plate.

[0010] The beneficial effects of the utility model are that the pressing plate is connected with the valve plate to make the sealing ring expand along its radial direction, so that the sealing part is extruded on the inner wall surface of the valve body after being pressed, thereby achieving the cutting and sealing of the medium. In particular, the sealing part is attached to the valve plate, and the sealing part is sleeved on the outer circumferential surface of the pressing plate, so that the contact area of the sealing ring and the valve body can be increased to further improve the sealing performance of the equipment. Therefore, the equipment can effectively prevent the leakage of the medium from both sides of the valve assembly through the deformation of the sealing ring and the increase of the contact area of the sealing ring and the valve body. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a schematic view of the main structure of the utility model;

[0012] Figure 2 It is a schematic view of the main structure of the utility model;

[0013] Figure 3 It is a schematic view of the main structure of the utility model; Figure 2 It is a schematic view of the main structure of the utility model;

[0014] Figure 4 It is a schematic view of the main structure of the utility model;

[0015] Figure 5 It is a schematic view of the main structure of the utility model;

[0016] Figure 6 It is a schematic view of the main structure of the utility model; Figure 5 It is a schematic view of the main structure of the utility model;

[0017] In the drawing: 1, valve body; 2, valve assembly; 20, valve plate; 21, pressing plate; 22, sealing ring; 23, supporting part; 24, attaching part; 25, sealing part; 26, first protruding part; 27, second protruding part; 28, bolt; 29, internal thread hole. DETAILED DESCRIPTION

[0018] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to be illustrative of the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "upper surface" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be construed as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0019] Referring to Figures 1-6 The present application provides an embodiment: a backflow prevention bidirectional hard sealing butterfly valve, comprising a valve body 1, the valve body 1 is provided with a valve flap assembly 2; the valve flap assembly 2 comprises a valve plate 20 and a pressing plate 21, the valve plate 20 is provided with an elastic sealing ring 22; the sealing ring 22 comprises a lamination part 24 attached to the valve plate 20 and a sealing part 25 integrally formed with the lamination part 24; the lamination part 24 is attached to the valve plate 20, and the sealing part 25 is sleeved on the outer circumferential surface of the pressing plate 21; the pressing plate 21 is connected with the valve plate 20 to cause the sealing ring 22 to expand radially, so that the sealing part 25 is pressed and extruded on the inner wall surface of the valve body 1.

[0020] In summary, the pressing plate 21 is connected with the valve plate 20 to cause the sealing ring 22 to expand radially, so that the sealing part 25 is pressed and extruded on the inner wall surface of the valve body 1, thereby achieving the cutting and sealing of the medium. In particular, the lamination part 24 is attached to the valve plate 20, and the sealing part 25 is sleeved on the outer circumferential surface of the pressing plate 21, so that the contact area of the sealing ring 22 and the valve body 1 can be increased to further improve the sealing performance of the device. Therefore, by deforming the sealing ring 22 and increasing the contact area of the sealing ring 22 and the valve body 1, the device can effectively prevent leakage of the medium from both sides of the valve flap assembly.

[0021] Further, the lamination part 24 facing the valve plate 20 is further provided with a first protruding part 26, so that when the sealing ring 22 is pressed by the pressing plate 21 and contacts the valve plate 20, the first protruding part 26 can cause the lamination part 24 to tightly contact the valve plate 20 and further cause the sealing ring 22 to deform. Similarly, the lamination part 24 facing the pressing plate 21 is further provided with a second protruding part 27.

[0022] Therefore, the two convex portions can further promote the expansion of the sealing ring 22 along the radial direction, so that the contact sealing property of the sealing ring 22 and the valve body 1 is further improved.

[0023] In order to ensure that the sealing ring 22 can only expand along the radial direction, the valve plate 20 is further provided with a supporting portion 23, and the sealing ring 22 is sleeved on the supporting portion 23. Therefore, when the sealing ring 22 is pressed, the supporting portion 23 promotes the sealing ring 22 to contract along the radial direction, so that the sealing ring 22 can only expand along the radial direction, so that the contact area of the sealing ring 22 and the valve body 1 is reliably ensured.

[0024] Further, since the outer diameter of the pressing plate 21 is greater than the outer diameter of the supporting portion 23, and the outer diameter of the pressing plate 21 is less than the outer diameter of the sealing ring 22, the pressing plate 21 can expand the contact area of the pressing plate 21 and the sealing ring 22 while fixing the sealing ring 22, so as to ensure that the sealing ring 22 can stably and reliably contact the valve body 1, and in particular, the phenomenon that the sealing ring 22 falls off from the supporting portion 23 can be avoided.

[0025] In addition, in order to facilitate the installation and replacement of the sealing ring 22, the bolt 28 is passed through the pressing plate 21 and connected with the internal threaded hole 29 provided on the supporting portion 23, so as to fix the sealing ring 22, and vice versa, the bolt 28 is disassembled to remove the pressing plate 21 for replacing the sealing ring 22.

[0026] The above describes the embodiments of the present application in detail in combination with the drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and still fall within the protection scope of the present application.

Claims

1. A backflow preventing, bidirectional, hard-seated butterfly valve, characterized by: The utility model relates to a valve, comprising a valve body (1) and a valve clack assembly (2) arranged in the valve body (1); The valve clack assembly (2) comprises a valve plate (20) and a pressing plate (21), and the valve plate (20) is provided with an elastic sealing ring (22); The sealing ring (22) comprises a fit part (24) fitted with the valve plate (20) and a sealing part (25) integrally formed with the fit part (24); The fit part (24) is fitted with the valve plate (20), and the sealing part (25) is sleeved on the outer circumferential surface of the pressing plate (21); The pressing plate (21) is connected with the valve plate (20) to make the sealing ring (22) expand along the radial direction, so that the sealing part (25) is pressed and pressed on the inner wall surface of the valve body (1).

2. A backflow preventing bi-directional hard-seated butterfly valve according to claim 1, characterized in that: The fit part (24) is further provided with a first protruding part (26) on the side facing the valve plate (20).

3. A backflow preventing bi-directional hard-seated butterfly valve according to claim 2, wherein: The fit part (24) is further provided with a second protruding part (27) on the side facing the pressing plate (21).

4. A backflow preventing bi-directional hard-seated butterfly valve according to claim 3, wherein: The valve plate (20) is further provided with a supporting part (23), and the sealing ring (22) is sleeved on the supporting part (23).

5. A backflow preventing bi-directional hard-seated butterfly valve according to claim 4, wherein: The outer diameter of the pressing plate (21) is greater than the outer diameter of the supporting part (23), and the outer diameter of the pressing plate (21) is smaller than the outer diameter of the sealing ring (22).

6. A backflow preventing bi-directional hard-seated butterfly valve according to claim 5, wherein: Further comprising a bolt (28), the bolt (28) passes through the pressing plate (21) and is connected with the internal thread hole (29) arranged on the supporting part (23).

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