Flange butterfly valve with sealing assembly

Abstract

The invention discloses a flange butterfly valve with a sealing assembly, and relates to the technical field of butterfly valves, the flange butterfly valve comprises a tail cover, a valve body is arranged at the top of the tail cover, the tail cover and the valve body are connected through a hexagon socket screw A, a shaft sleeve A is arranged in the bottom end of the valve body, a shaft sleeve B is arranged in the top end of the valve body, and a valve rod vertically penetrates through the shaft sleeve B; the bottom end of the valve rod is connected with the shaft sleeve A in an inserted mode. The flange butterfly valve with the sealing assembly mainly comprises a valve body, a butterfly plate, a valve rod, the sealing assembly and the like, has the advantages of bidirectional pressure bearing, hard sealing and the like, is suitable for various corrosive media and high-pressure pipelines, and adopts a double-sealing structure, when in use, the pressure on the hard sealing surface is gradually increased along with the medium pressure, the pressure is conducted to the soft sealing surface when the upper limit is broken through, and meanwhile, double-layer sealing is realized by means of deformation of the soft sealing.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valves, in particular to a flange butterfly valve with a sealing component. Background Art

[0002] A butterfly valve, also known as a flap valve, is a regulating valve with a simple structure. It can be used for switching control of low-pressure pipeline media. A butterfly valve refers to a valve in which the closing member (valve disc or butterfly plate) is a disc that rotates around the valve axis to achieve opening and closing.

[0003] Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. They mainly play the role of cutting off and throttling in pipelines. The butterfly valve opening and closing part is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating.

[0004] Since butterfly valves are usually used to cut off or throttle various types of fluids such as water, various corrosive media, mud, oil, liquid metal, etc. in pipelines, sealing performance is particularly important. Existing butterfly valves have poor sealing performance and are easily corroded after long-term use. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a flange butterfly valve with a sealing assembly, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a flange butterfly valve with a sealing assembly, comprising a tail cover, a valve body is provided on the top of the tail cover, the tail cover and the valve body are connected by a hexagon socket bolt A, a shaft sleeve A is provided inside the bottom end of the valve body, a shaft sleeve B is provided inside the top end of the valve body, a valve stem is vertically penetrated inside the shaft sleeve B, and the bottom end of the valve stem is plugged into the shaft sleeve A.

[0007] Optionally, a bracket is provided at the top of the valve body, the valve body and the bracket are connected by stud bolts, and a worm gear is provided at the top of the bracket.

[0008] Optionally, flanges are provided on both sides of the valve body, and the flanges are symmetrically distributed about the center line of the valve body.

[0009] Optionally, the tail cover, the valve body and the bracket are coaxial.

[0010] Optionally, the inner diameters of the sleeve A and the sleeve B match the outer diameter of the valve stem.

[0011] Optionally, a butterfly plate is provided in the middle of the valve stem, and the valve stem and the butterfly plate are connected by a hexagon socket bolt B.

[0012] Optionally, the butterfly plate forms a rotating structure through the valve stem.

[0013] Optionally, a sealing component is provided on the outer edge of the butterfly plate, and the sealing component consists of a soft seal and a hard seal, and the soft seal is located on one side of the hard seal.

[0014] Optionally, the soft seal is made of polytetrafluoroethylene.

[0015] Optionally, outer edges of the soft seal and the hard seal are both in contact with the inner wall of the valve body.

[0016] The present invention provides a flange butterfly valve with a sealing assembly, which has the following beneficial effects:

[0017] The flange butterfly valve with sealing assembly is mainly composed of a valve body, a butterfly plate, a valve stem and a sealing assembly, etc. It has the advantages of bidirectional pressure bearing and hard sealing, and is suitable for various corrosive media and high-pressure pipelines. It not only has a simple structure, small size, light weight, low material consumption, small installation size, small driving torque, simple and quick operation, but also has good flow regulation function and closing sealing characteristics;

[0018] The structure of D343H bidirectional hard seal butterfly valve is mainly composed of valve body, butterfly plate, valve stem, sealing assembly, etc. Among them, the valve body is the main structure of the whole valve, and there is a channel connected to the pipeline inside. The butterfly plate is the opening and closing part of the valve, which can move in the valve body channel to realize the opening and closing of the valve. The valve stem is a component connecting the butterfly plate and the drive device. The opening and closing of the butterfly plate can be controlled by rotating the valve stem. The sealing assembly is a key component to ensure the sealing performance of the valve, including soft seal and hard seal. The soft seal is made of rubber or polytetrafluoroethylene. Polytetrafluoroethylene has strong corrosion resistance, stable performance, not easy to age, low friction coefficient, easy to form, stable size, and can be improved by filling and adding appropriate materials. Its comprehensive performance can be obtained by obtaining a butterfly valve sealing material with better strength and lower friction coefficient, thereby further improving the performance of the butterfly valve. The hard seal is made of metal or non-metallic materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view schematic diagram of the invention;

[0020] Figure 2 It is a front view full cross-sectional schematic diagram of the invention;

[0021] Figure 3 This is a schematic diagram of the valve stem of the invention;

[0022] Figure 4 It is a side view schematic diagram of the invention;

[0023] Figure 5 For the invention Figure 2 A is an enlarged schematic diagram.

[0024] In the figure: 1. tail cover; 2. hexagon socket bolt A; 3. sleeve A; 4. hexagon socket bolt B; 5. valve stem; 6. sleeve B; 7. stud bolt; 8. bracket; 9. worm gear; 10. valve body; 11. butterfly plate. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figures 1 to 5 The present invention provides a technical solution: a flange butterfly valve with a sealing assembly, comprising a tail cover 1, a valve body 10 is arranged on the top of the tail cover 1, the tail cover 1 and the valve body 10 are connected by a hexagon socket bolt A2, a shaft sleeve A3 is arranged inside the bottom end of the valve body 10, a shaft sleeve B6 is arranged inside the top end of the valve body 10, a valve stem 5 is vertically penetrated inside the shaft sleeve B6, and the bottom end of the valve stem 5 is plugged into the shaft sleeve A3.

[0029] In this embodiment, Figure 1 and Figure 2 As shown, a bracket 8 is provided at the top of the valve body 10, the valve body 10 and the bracket 8 are connected by stud bolts 7, and a worm gear 9 is provided at the top of the bracket 8; the valve body 10 is the main structure of the entire valve, and a channel connected to the pipeline is provided inside.

[0030] In this embodiment, Figure 1 and Figure 2 As shown, flanges are provided on both sides of the valve body 10 , and the flanges are symmetrically distributed about the center line of the valve body 10 .

[0031] In this embodiment, Figure 2 As shown, the tail cover 1, the valve body 10 and the bracket 8 are coaxial.

[0032] In this embodiment, Figure 2 and Figure 3 As shown, the inner diameters of the sleeves A3 and B6 match the outer diameter of the valve stem 5 .

[0033] In this embodiment, Figure 2 and Figure 4 As shown, a butterfly plate 11 is provided in the middle of the valve stem 5, and the valve stem 5 and the butterfly plate 11 are connected by a hexagon socket bolt B4; the butterfly plate 11 is the opening and closing part of the valve, and can move in the channel of the valve body 10 to realize the opening and closing of the valve.

[0034] In this embodiment, Figure 4 As shown, the butterfly plate 11 forms a rotating structure through the valve stem 5; the valve stem 5 is a component connecting the butterfly plate 11 and the driving device, and the opening and closing of the butterfly plate 11 can be controlled by rotating the valve stem 5.

[0035] In this embodiment, Figure 2 and Figure 4 As shown, a sealing component is provided on the outer edge of the butterfly plate 11. The sealing component is composed of a soft seal and a hard seal. The soft seal is located on one side of the hard seal.

[0036] In this embodiment, the soft seal is made of polytetrafluoroethylene; the soft seal is made of rubber or polytetrafluoroethylene, polytetrafluoroethylene has strong corrosion resistance, stable performance, not easy to age, low friction coefficient, easy to form, stable size, and can be filled and added with appropriate materials to improve its comprehensive performance to obtain a butterfly valve sealing material with better strength and lower friction coefficient, thereby further improving the performance of the butterfly valve;

[0037] In this embodiment, the outer edges of the soft seal and the hard seal are both in contact with the inner wall of the valve body 10 .

[0038] The use method of the present invention: When the flange butterfly valve with a sealing component is used, the working process is as follows:

[0039] like Figures 1 to 5As shown, first, when the valve is opened, the medium flows from the pipeline into the channel of the valve body 10, pushing the butterfly plate 11 to move to one side. During the movement of the butterfly plate 11, the soft sealing surface of the sealing component contacts the valve seat to form the first seal; at the same time, the other side of the hard sealing surface contacts the valve seat to form the second seal, so that the medium is completely sealed in the valve seat under pressure. When the valve is closed, the medium pressure gradually increases, and the stress on the hard sealing surface also increases. When the stress reaches a certain value, the stress on the hard sealing surface is transferred to the soft sealing surface, causing the stress on the soft sealing surface to increase. When the stress on the soft sealing surface increases to exceed its yield limit, the soft sealing surface deforms and fits with the valve seat to form the first seal; at the same time, the hard sealing surface contacts the valve seat to form the second seal, so that the medium is completely blocked outside the valve.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flange butterfly valve with a sealing assembly, comprising a tail cover (1), characterized in that: A valve body (10) is provided on the top of the tail cover (1), and the tail cover (1) and the valve body (10) are connected via a hexagon socket bolt A (2). A shaft sleeve A (3) is provided inside the bottom end of the valve body (10), and a shaft sleeve B (6) is provided inside the top end of the valve body (10). A valve stem (5) vertically penetrates the inside of the shaft sleeve B (6), and the bottom end of the valve stem (5) is plugged into the shaft sleeve A (3).

2. The flange butterfly valve with a sealing assembly according to claim 1, characterized in that: A bracket (8) is provided at the top end of the valve body (10), the valve body (10) and the bracket (8) are connected via stud bolts (7), and a worm gear (9) is provided at the top of the bracket (8).

3. The flange butterfly valve with a sealing assembly according to claim 1, characterized in that: Flanges are provided on both sides of the valve body (10), and the flanges are symmetrically distributed about the center line of the valve body (10).

4. The flange butterfly valve with a sealing assembly according to claim 2, characterized in that: The tail cover (1), the valve body (10) and the bracket (8) are coaxial.

5. The flange butterfly valve with a sealing assembly according to claim 1, characterized in that: The inner diameters of the shaft sleeve A (3) and the shaft sleeve B (6) match the outer diameter of the valve stem (5).

6. The flange butterfly valve with a sealing assembly according to claim 1, characterized in that: A butterfly plate (11) is provided in the middle of the valve stem (5), and the valve stem (5) and the butterfly plate (11) are connected via a hexagon socket bolt B (4).

7. The flange butterfly valve with a sealing assembly according to claim 6, characterized in that: The butterfly plate (11) forms a rotating structure through the valve stem (5).

8. The flange butterfly valve with a sealing assembly according to claim 6, characterized in that: A sealing component is provided on the outer edge of the butterfly plate (11), the sealing component is composed of a soft seal and a hard seal, and the soft seal is located on one side of the hard seal.

9. The flange butterfly valve with a sealing assembly according to claim 8, characterized in that: The soft seal is made of polytetrafluoroethylene.

10. The flange butterfly valve with a sealing assembly according to claim 8, characterized in that: The outer edges of the soft seal and the hard seal are both in contact with the inner wall of the valve body (10).

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