Hard sealing butterfly valve for high temperature

Abstract

The utility model discloses a hard sealing butterfly valve for high temperature, which comprises a valve body, an upper valve rod and a lower valve rod are respectively embedded into the top and the bottom of the valve body, the top of the valve body is fixedly connected with a support, a valve rod shaft sleeve is arranged outside the upper valve rod, the valve rod shaft sleeve penetrates through the support, and a mounting key is arranged at the top end of the valve rod shaft sleeve. An upper filler, a middle filler and a lower filler are jointly arranged between the top end of the valve body and the outer wall of the valve rod shaft sleeve, a filler gland is arranged at the bottom in the support, a butterfly plate is jointly and fixedly connected between the upper valve rod and the lower valve rod, and a main sealing ring pressing plate is arranged on one side of the valve body. The butterfly valve has the advantages that when the sealing face of the butterfly plate is attached to the main sealing ring, the main sealing ring can conduct micro floating displacement and automatically adjust the position of the sealing face under certain pressure, friction is not generated between the sealing face of the butterfly plate and the main sealing ring when the valve is opened and closed, the sealing face can be directly attached, the sealing effect is enhanced, and the service life of the valve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature hard sealing butterfly valve technical field, concretely is high temperature hard sealing butterfly valve. BACKGROUND

[0002] Butterfly valve, also known as flap valve, is a simple structure regulating valve, mainly used for low pressure pipeline medium on-off control. The closing piece (valve clapper or butterfly plate) of butterfly valve is a disc, rotates around the valve shaft to realize opening and closing. It can realize the opening, closing and regulation of flow through about 90° reciprocating rotation. Butterfly valve is widely used in industrial and civil fields, and is suitable for controlling air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive medium etc.

[0003] At present, the conventional high temperature hard sealing butterfly valve in the prior art is difficult to repair if the valve seat sealing surface or the sealing ring is damaged during use.

[0004] Therefore, the utility model provides a high temperature hard sealing butterfly valve. SUMMARY

[0005] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name. Such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] To solve the above technical problems, according to one aspect of the utility model, the utility model provides the following technical scheme:

[0007] The high temperature hard sealing butterfly valve, including valve body, the top and bottom of valve body are embedded with upper valve rod and lower valve rod respectively, the top of valve body is fixedly connected with support, the outer part of upper valve rod is provided with valve rod shaft sleeve, the valve rod shaft sleeve penetrates through support and is provided with mounting key at the top, the top of valve body and the outer wall of valve rod shaft sleeve are provided with upper packing, middle packing and lower packing, the inner bottom of support is provided with packing gland;

[0008] The upper valve rod and the lower valve rod are fixedly connected with butterfly plate, the one side of valve body is provided with main sealing ring pressing plate, the inner wall of butterfly plate and valve body is provided with main sealing ring, the inner wall of butterfly plate and valve body is provided with main sealing surface and auxiliary sealing surface respectively.

[0009] As a preferred embodiment of the high-temperature hard-seal butterfly valve described in this utility model, the main sealing ring pressure plate is threadedly connected to the inner wall of the valve body, and the main sealing ring pressure plate is positioned to the outer side of the valve body by a set screw, which facilitates the generation of a reasonable specific pressure between the main sealing ring pressure plate and the main sealing ring during assembly.

[0010] As a preferred embodiment of the high-temperature hard-seal butterfly valve of this utility model, the main sealing ring is arranged in a circular shape and the cross-section of the main sealing ring is arranged in a U-shape, so that the main sealing ring can generate a certain elastic deformation during the pressure process, thereby generating a certain sealing specific pressure, so that it fits tightly with the sealing surface of the butterfly plate to form a seal.

[0011] As a preferred embodiment of the high-temperature hard-seal butterfly valve of this utility model, both sides of the butterfly plate are arranged in an oblique cone shape towards the center of the flow channel in the valve body, and the central axis of the sealing cone surface of the butterfly plate coincides with the center line of the flow channel in the valve body.

[0012] As a preferred embodiment of the high-temperature hard-seal butterfly valve described in this utility model, the main sealing ring pressure plate, the main sealing ring and the outer wall of the butterfly plate are tightly fitted together. Through the tight fit between the three, the main sealing ring can make slight floating displacement under a certain pressure, automatically adjust the position of the sealing surface, and form a dynamic seal.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. When the butterfly plate sealing surface is in contact with the main sealing ring, the main sealing ring can make a slight floating displacement under a certain pressure, automatically adjusting the position of the sealing surface. When the valve is opened and closed, the butterfly plate sealing surface and the main sealing ring do not generate friction, which allows the sealing surfaces to be directly in contact, enhancing the sealing effect and improving the service life of the valve.

[0015] 2. The two sides of the main sealing ring are in contact with the main sealing ring pressure plate and the valve body. During the pressure process, the main sealing ring will undergo a certain elastic deformation, generating a certain sealing specific pressure, so that it is tightly in contact with the valve body (secondary sealing surface) to form a seal.

[0016] 3. The main sealing ring is detachable, easy to operate, and convenient to maintain. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1This is a schematic diagram of the structure of the high-temperature hard-seal butterfly valve of this utility model;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0020] Legend: 1. Valve body; 2. Upper valve stem; 3. Lower valve stem; 4. Bracket; 5. Valve stem bushing; 6. Mounting key; 7. Upper packing; 8. Middle packing; 9. Lower packing; 10. Packing gland; 11. Butterfly plate; 12. Main sealing ring pressure plate; 13. Main sealing ring; 14. Set screw; 15. Main sealing surface; 16. Secondary sealing surface. Detailed Implementation

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0024] Please see Figures 1-2 This utility model provides a high-temperature hard-seal butterfly valve, including a valve body 1. An upper valve stem 2 and a lower valve stem 3 are respectively embedded in the top and bottom of the valve body 1. A bracket 4 is fixedly connected to the top of the valve body 1. A valve stem sleeve 5 is provided on the outside of the upper valve stem 2. The valve stem sleeve 5 passes through the bracket 4 and has an installation key 6 at its top. An upper packing 7, a middle packing 8, and a lower packing 9 are provided between the top of the valve body 1 and the outer wall of the valve stem sleeve 5. A packing gland 10 is provided at the bottom of the bracket 4.

[0025] A butterfly plate 11 is fixedly connected between the upper valve stem 2 and the lower valve stem 3. A main sealing ring pressure plate 12 is provided on one side of the valve body 1. A main sealing ring 13 is provided between the butterfly plate 11 and the inner wall of the valve body 1.

[0026] The main sealing ring pressure plate 12, the main sealing ring 13 and the outer wall of the butterfly plate 11 are tightly fitted together. Through the tight fit between the three, the main sealing ring 13 can make slight floating displacement under a certain pressure, automatically adjust the position of the sealing surface, and form a dynamic seal.

[0027] In this embodiment, the main sealing ring pressure plate 12 is threaded to the inner wall of the valve body 1, and the main sealing ring pressure plate 12 is positioned to the outer side of the valve body 1 by the set screw 14, so that the main sealing ring pressure plate 12 and the main sealing ring 13 can generate a reasonable specific pressure during assembly.

[0028] Meanwhile, both sides of the butterfly plate 11 are set in an oblique cone shape towards the center of the flow channel inside the valve body 1, and the central axis of the sealing cone surface of the butterfly plate 11 coincides with the center line of the flow channel of the valve body 1, so that the main sealing ring 13 can be in a floating state.

[0029] A main sealing surface 15 and a secondary sealing surface 16 are respectively provided between the butterfly plate 11 and the inner wall of the valve body 1.

[0030] In this embodiment, the main sealing ring 13 is arranged in a circular shape and the cross-section of the main sealing ring 13 is arranged in a U-shape, so that the main sealing ring 13 can generate a certain elastic deformation during the pressure process, thereby generating a certain sealing specific pressure, so that it fits tightly with the sealing surface of the butterfly plate 11 to form a seal.

[0031] When in use, when the main sealing surface 15 is in contact with the main sealing ring 13, the main sealing ring 13 can make a slight floating displacement under a certain pressure, automatically adjusting the position of the sealing surface, which can make the sealing surface fit more tightly and enhance the sealing effect.

[0032] Meanwhile, the two side planes of the main sealing ring 13 are in contact with the main sealing surface 15 and the secondary sealing surface 16. During the pressure process, the main sealing ring 13 will undergo a certain elastic deformation, generating a certain sealing specific pressure, so that it is tightly in contact with the secondary sealing surface 16 to form a seal.

[0033] In this device, the main sealing ring 13 is pressed and fixed by the main sealing ring pressure plate 12 and fixed by the set screw 14, which makes the main sealing ring 13 easy to disassemble and very convenient to maintain.

[0034] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-temperature hard-seal butterfly valve, comprising a valve body (1), characterized in that, The valve body (1) is fitted with an upper valve stem (2) and a lower valve stem (3) at its top and bottom respectively. A bracket (4) is fixedly connected to the top of the valve body (1). A valve stem bushing (5) is provided on the outside of the upper valve stem (2). The valve stem bushing (5) passes through the bracket (4) and has an installation key (6) at its top. An upper packing (7), a middle packing (8), and a lower packing (9) are provided between the top of the valve body (1) and the outer wall of the valve stem bushing (5). A packing gland (10) is provided at the bottom of the bracket (4). A butterfly plate (11) is fixedly connected between the upper valve stem (2) and the lower valve stem (3). A main sealing ring pressure plate (12) is provided on one side of the valve body (1). A main sealing ring (13) is provided between the butterfly plate (11) and the inner wall of the valve body (1). A main sealing surface (15) and a secondary sealing surface (16) are respectively provided between the butterfly plate (11) and the inner wall of the valve body (1).

2. The high-temperature hard-seal butterfly valve according to claim 1, characterized in that, The main sealing ring pressure plate (12) is threaded to the inner wall of the valve body (1), and the main sealing ring pressure plate (12) is fixed to the outer side of the valve body (1) by a set screw (14).

3. The high-temperature hard-seal butterfly valve according to claim 1, characterized in that, The main sealing ring (13) is arranged in a circular shape, and the cross-section of the main sealing ring (13) is arranged in a U-shape.

4. The high-temperature hard-seal butterfly valve according to claim 1, characterized in that, Both sides of the butterfly plate (11) are arranged in an oblique cone shape towards the center of the flow channel inside the valve body (1), and the central axis of the sealing cone surface of the butterfly plate (11) coincides with the center line of the flow channel of the valve body (1).

5. The high-temperature hard-seal butterfly valve according to claim 1, characterized in that, The main sealing ring pressure plate (12), the main sealing ring (13) and the outer wall of the butterfly plate (11) are tightly fitted together.

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