Composite gasket for butterfly valve plate

Abstract

The composite gasket for the valve plate of the butterfly valve is annular, an inner hole of the composite gasket is round, and an outer circle of the composite gasket is oval. The composite gasket comprises a plurality of layers of stainless steel plates and a plurality of layers of flexible graphite plates, the stainless steel plates and the flexible graphite plates are alternately stacked, the first layer and the last layer of the composite gasket are the stainless steel plates, and the stainless steel plates and the flexible graphite plates are attached and compounded in a vacuum environment to form the whole composite gasket. The thickness of the stainless steel plate is larger than or equal to 0.5 mm, and the thickness of the flexible graphite plate in the composite gasket finished product is larger than or equal to 0.5 mm. The outer side face of the outer circle of the composite gasket is an inclined face, and the inclined face is gradually enlarged from the end point of the short axis of the ellipse to the end point of the long axis of the ellipse. When in use, the sealing ring is sleeved on the outer circle of the valve plate, so that the sealing performance of the valve plate can be improved.

Description

Technical Field

[0001] The utility model relates to a composite gasket used for a butterfly valve plate. Background Art

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. A butterfly valve features a disc-shaped closing element (valve disc) that rotates around a valve axis to open and close. Butterfly valves can be used to control the flow of various fluids, including air, water, steam, various corrosive media, slurries, oils, liquid metals, and radioactive media, primarily serving as shutoff and throttling mechanisms in pipelines. The opening and closing element of a butterfly valve is a disc-shaped valve disc that rotates around its axis within the valve body to achieve opening, closing, or regulation. However, the sealing performance of existing valve discs remains to be improved. Summary of the Invention

[0003] In order to overcome the above-mentioned deficiencies of the valve plate of the existing butterfly valve, the utility model provides a composite gasket for the valve plate of a butterfly valve, which can further improve the sealing effect of the valve plate.

[0004] The technical solution of the utility model to solve the technical problem is: a composite gasket for a butterfly valve plate, the composite gasket is annular, the inner hole of the composite gasket is circular, and the outer circle of the composite gasket is elliptical;

[0005] The composite gasket comprises several layers of stainless steel plates and several layers of flexible graphite plates, the stainless steel plates and the flexible graphite plates being alternately stacked, the first and last layers of the composite gasket being both stainless steel plates, and the stainless steel plates and the flexible graphite plates being laminated to each other in a vacuum environment to form a composite gasket as a whole;

[0006] The thickness of the stainless steel plate is ≥0.5 mm, and the thickness of the flexible graphite plate in the finished composite gasket is ≥0.5 mm;

[0007] The outer side surface of the outer circle of the composite gasket is an inclined surface, and the inclined surface gradually increases from the end point of the minor axis of the ellipse to the end point of the major axis of the ellipse.

[0008] Furthermore, the ratio of the major axis of the ellipse to the minor axis of the ellipse is 1.05-1.1:1.

[0009] The beneficial effect of the utility model is that when the utility model is used, it is sleeved on the outer circle of the valve plate, which can improve the sealing performance of the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the main view of the present utility model.

[0011] Figure 2 yes Figure 1AA section view.

[0012] Figure 3 yes Figure 1 BB cross-sectional view. DETAILED DESCRIPTION

[0013] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0014] Reference Figure 1-Figure 3 , a composite gasket 1 for a butterfly valve plate, the composite gasket 1 is annular, the inner hole of the composite gasket 1 is circular, and the outer circle of the composite gasket 1 is elliptical. When in use, the valve plate is sleeved into the circular inner hole of the composite gasket 1. Generally, the inner wall of the pipeline is provided with a sealing gasket such as a rubber gasket to cooperate with the valve plate, and the outer circle of the composite gasket 1 is elliptical, so that when the valve plate is closed, the composite gasket 1 causes more deformation between the rubber gasket and other sealing gaskets to achieve a better sealing effect. Of course, the ratio of the major axis to the minor axis of the ellipse cannot be too large, otherwise a gap will be generated between the pipeline during sealing. In one embodiment, the ratio of the major axis of the ellipse to the minor axis of the ellipse is 1.05-1.1:1.

[0015] The composite gasket 1 includes several layers of stainless steel plates 2 and several layers of flexible graphite plates 3, which are alternately stacked. The first and last layers of the composite gasket 1 are both stainless steel plates 2. The stainless steel plates 2 and flexible graphite plates 3 are bonded and compounded with each other under a vacuum environment to form a composite gasket as a whole. In the vacuum environment, the flexible graphite is fully compressed to form a flexible graphite layer with a higher density, so that the flexible graphite layer can withstand fluid impact. The thickness of the flexible graphite plate 3 in the finished composite gasket is ≥0.5 mm, and the thickness of the stainless steel plate 2 is ≥0.5 mm to cope with the challenge of higher fluid pressure in butterfly valve use.

[0016] The outer side surface of the outer circle of the composite gasket 1 is a bevel 4, and the bevel 4 gradually increases from the end point of the minor axis of the ellipse to the end point of the major axis of the ellipse. The existence of the bevel enables the composite gasket to form a more effective surface seal at the bevel, thereby achieving a better sealing effect.

[0017] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0018] The above describes the implementation methods of the present invention. However, the present invention is not limited to the above implementation methods. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A composite gasket for a butterfly valve plate, the composite gasket being annular and characterized by: The inner hole of the composite gasket is circular, and the outer circle of the composite gasket is elliptical; The composite gasket comprises several layers of stainless steel plates and several layers of flexible graphite plates, the stainless steel plates and the flexible graphite plates being alternately stacked, the first and last layers of the composite gasket being both stainless steel plates, and the stainless steel plates and the flexible graphite plates being laminated to each other in a vacuum environment to form a composite gasket as a whole; The thickness of the stainless steel plate is ≥0.5 mm, and the thickness of the flexible graphite plate in the finished composite gasket is ≥0.5 mm; The outer side surface of the outer circle of the composite gasket is an inclined surface, and the inclined surface gradually increases from the end point of the minor axis of the ellipse to the end point of the major axis of the ellipse.

2. The composite gasket for a butterfly valve plate according to claim 1, characterized in that: The ratio of the major axis of the ellipse to the minor axis of the ellipse is 1.05-1.1:1.

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