Double-seal butterfly valve device convenient to overhaul

Abstract

The utility model relates to the technical field of butterfly valves, and discloses a double-seal butterfly valve convenient to overhaul, which solves the problems in the background technology, and comprises a valve body, a butterfly plate, a valve seat, a valve shaft, an overhaul sealing operation pipeline and a middle plate, the overhaul sealing operation pipeline is arranged in the valve shaft, a through hole is arranged on the outer end face of the valve shaft, and the middle plate is arranged in the middle plate. A cavity is formed between one side of the middle plate and the butterfly plate, the overhaul sealing operation pipeline is communicated with the cavity, the overhaul sealing ring is arranged in the cavity, the other side of the middle plate is tightly attached to the upper portion of the working sealing ring, and the lower portion of the working sealing ring is tightly attached to the adjusting pressing plate. According to the utility model, the sealing ring is controlled and overhauled by utilizing fluid pressure, the operation is simpler, the weight and the processing cost are reduced, and the field installation is more convenient.

Description

Technical Field

[0001] This utility model belongs to the field of butterfly valve technology, specifically a double-sealed butterfly valve that is easy to maintain. Background Technology

[0002] A butterfly valve is a simple regulating valve that opens, closes, and regulates the fluid passage by rotating a valve plate around its axis. Soft-seal butterfly valves achieve sealing through the sealing action of a soft sealing ring and the valve seat.

[0003] In the existing technology, an upstream movable valve seat is set at the valve body inlet to cooperate with the butterfly plate maintenance sealing ring, and a downstream fixed valve seat is set at the valve body outlet to cooperate with the butterfly plate working sealing ring. This structure requires two sealing seats. At the same time, in order to detect the position of the movable valve seat, many operating rods are set on the outside of the valve body. During on-site installation, it is necessary to ensure the accurate position of the operating rods, which is inconvenient. Therefore, we propose a double-sealed butterfly valve that is easy to maintain. Utility Model Content

[0004] To address the problems of current double-seal butterfly valves requiring multiple operating levers for maintenance and installation, making it difficult to ensure accurate lever positioning and causing installation inconvenience, this utility model provides the following technical solution: A double-seal butterfly valve device for easy maintenance, comprising a valve body, a butterfly plate, a valve seat, a valve shaft, a maintenance sealing operation pipeline, and an intermediate plate. The maintenance sealing operation pipeline is located inside the valve shaft, with a through hole on the outer end face of the valve shaft communicating with the maintenance sealing operation pipeline. The other end of the maintenance sealing operation pipeline is connected to the back of the butterfly plate. A cavity is formed between one side of the intermediate plate and the butterfly plate, through which the maintenance sealing operation pipeline communicates. A maintenance sealing ring is located within the cavity. The other side of the intermediate plate is pressed against the upper part of the working sealing ring, and the lower part of the working sealing ring is pressed against the adjusting pressure plate. The adjusting pressure plate is detachably connected to the intermediate plate. The intermediate plate, the working sealing ring, and the adjusting pressure plate are sequentially connected and fixed to the butterfly plate.

[0005] Preferably, the contact area between the inspection sealing ring and the butterfly plate is overlaid with rust-proof material.

[0006] Preferably, the maintenance seal and the working seal are made of NBR rubber.

[0007] Preferably, the intermediate plate, the working sealing ring, and the adjusting pressure plate are sequentially fixed to the butterfly plate by screws.

[0008] Preferably, the valve seat, intermediate plate, adjusting pressure plate and screws are made of stainless steel.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] When the working seal ring is damaged and needs to be replaced, first inject fluid into the maintenance seal operation pipeline through the through hole. After the fluid enters the cavity, it squeezes the maintenance seal ring, causing the maintenance seal ring to expand outward and squeeze the valve seat to achieve a seal and maintain a constant pressure inside the valve body. At this time, the working seal ring can be removed and replaced. Compared with the operation of an external operating mechanism, using fluid pressure to control the maintenance seal ring is simpler to operate, reduces weight and processing costs, and makes on-site installation more convenient. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0012] Figure 1 This is a schematic side sectional view of the present invention.

[0013] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0014] Figure 3 This is a schematic diagram of the maintenance and sealing operation pipeline structure of this utility model.

[0015] In the diagram: 1. Valve body; 2. Butterfly plate; 3. Valve seat; 4. Inspection and sealing operation pipeline; 5. Cavity; 6. Inspection sealing ring; 7. Intermediate plate; 8. Working sealing ring; 9. Adjusting pressure plate; 10. Screw; 11. Through hole; 12. Valve shaft. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] Depend on Figures 1 to 3 As provided, this utility model includes:

[0018] The valve body 1, butterfly plate 2, valve seat 3, valve shaft 12, maintenance and sealing operation pipeline 4, and intermediate plate 7 are provided. The maintenance and sealing operation pipeline 4 is located inside the valve shaft 12. A through hole 11 is provided on the outer end face of the valve shaft 12, which communicates with the maintenance and sealing operation pipeline. The other end of the maintenance and sealing operation pipeline 4 is connected to the back of the butterfly plate 2. A cavity 5 is formed between one side of the intermediate plate 7 and the butterfly plate 2. The maintenance and sealing operation pipeline 4 communicates with the cavity 5. A maintenance sealing ring 6 is located inside the cavity 5. The other side of the intermediate plate is close to the upper part of the working sealing ring 8. The lower part of the working sealing ring 8 is close to the adjusting pressure plate 9. The adjusting pressure plate 9 is detachably connected to the intermediate plate 7. The intermediate plate 7, the working sealing ring 8, and the adjusting pressure plate 9 are sequentially connected and fixed on the butterfly plate 2. Fluid is injected into the maintenance and sealing operation pipeline 4 through the through hole 11. After the fluid enters the cavity 5, it squeezes the maintenance sealing ring 6. The maintenance sealing ring 6 expands outward and squeezes the valve seat 3 to achieve a seal and maintain a constant pressure inside the valve body. At this time, the working sealing ring 8 can be removed and replaced. After the working sealing ring 8 is replaced, the water or air pressure is removed, and the maintenance sealing ring 6 is removed from the valve seat 3, which can reduce wear. Compared with the operation of an external operating mechanism, the operation of the maintenance sealing ring 6 is simpler by using fluid pressure to control it, which reduces weight and processing costs and makes on-site installation more convenient.

[0019] The contact area between the sealing ring 6 and the butterfly plate 2 is welded with anti-rust material to prevent corrosion.

[0020] The maintenance seal 6 and the working seal 8 are made of NBR rubber, which enhances wear resistance and airtightness.

[0021] The intermediate plate 7, the working sealing ring 8, and the adjusting pressure plate 9 are fixed to the butterfly plate 2 in sequence by screws 10. When removing the working sealing ring 8, first remove the screws, then remove the adjusting pressure plate 9 in sequence, and finally remove the working sealing ring 8. When the working sealing ring 8 is worn, it can be tightened again by screws.

[0022] The valve seat 3, intermediate plate 7, adjusting pressure plate 9 and screw 10 are made of stainless steel to prevent rust.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-seal butterfly valve assembly that facilitates maintenance, characterized in that, The utility model relates to a butterfly valve, which comprises a valve body (1), a butterfly plate (2), a valve seat (3), a valve shaft (12), a maintenance sealing operation pipeline (4) arranged in the valve shaft (12), a through hole (11) arranged on the outer end surface of the valve shaft (12), a cavity (5) formed between one side of the intermediate plate (7) and the butterfly plate (2), a maintenance sealing ring (6) arranged in the cavity (5), a working sealing ring (8) tightly attached to the upper part of the other side of the intermediate plate (7), an adjusting pressure plate (9) tightly attached to the lower part of the working sealing ring (8), and the adjusting pressure plate (9) is detachably connected to the intermediate plate (7). The contact part of the maintenance sealing ring (6) and the butterfly plate (2) is stacked with anti-rust material.

2. A double-seal butterfly valve assembly for ease of maintenance according to claim 1, characterized in that: The maintenance sealing ring (6) and the working sealing ring (8) are made of NBR rubber.

3. The double-seal butterfly valve apparatus of claim 1, wherein: The intermediate plate (7), the working sealing ring (8) and the adjusting pressure plate (9) are sequentially fixed to the butterfly plate (2) through screws (10).

4. The double-seal butterfly valve apparatus of claim 1, wherein: The valve seat (3), the intermediate plate (7), the adjusting pressure plate (9) and the screws (10) are made of stainless steel.

5. A double-seal butterfly valve assembly for ease of maintenance according to claim 4, wherein: ​

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