Soft sealing butterfly valve

Abstract

The utility model discloses a soft sealing butterfly valve, and relates to the field of sealing valves. The soft sealing butterfly valve comprises a valve body, a butterfly plate is arranged in the valve body, a valve rod is fixedly connected to the middle of the butterfly plate, sealing mechanisms are arranged at the two ends of the valve rod, each sealing mechanism comprises a first sealing ring and a second sealing ring, the first sealing ring is fixedly connected to the upper end of the interior of the valve body, and the second sealing ring is fixedly connected to the lower end of the interior of the valve body. The first sealing ring is rotationally connected with the outer surface of the valve rod; by means of the first sealing ring and the second sealing ring which are arranged in the valve body, when a medium passes through the valve body, the medium is prevented from making contact with the valve rod, corrosion and leakage are not prone to occurring, the gland is arranged on the top of the valve rod, and therefore the valve rod is fixed, and the valve body is prevented from being damaged. The valve rod is prevented from flying out due to too large pressure in a pipeline, the problem that a traditional soft sealing butterfly valve is short in service life is solved, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing valves, in particular to a soft sealing butterfly valve. 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] Butterfly valves are divided into centerline butterfly valves, double eccentric butterfly valves, and triple eccentric butterfly valves according to their different structures. Regardless of the structure, the shaft hole needs to be processed. Conventional processing is done by directly drilling and reaming. The concentricity and roundness cannot be guaranteed at all. In addition, most of the butterfly valves on the market are pinned butterfly valves. As the use time accumulates, the valve stem will come into contact with the fluid medium, causing corrosion and leakage, thereby shortening the service life of the valve. For this reason, a soft-sealed butterfly valve is specially provided to solve the above problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a soft-sealed butterfly valve, which solves the problem of low service life of traditional soft-sealed butterfly valves and improves safety.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a soft-sealed butterfly valve, comprising a valve body, a butterfly plate is arranged inside the valve body, a valve stem is fixedly connected in the middle of the butterfly plate, and sealing mechanisms are arranged at both ends of the valve stem, including:

[0006] A first sealing ring, which is fixedly connected to the upper end of the valve body and is rotatably connected to the outer surface of the valve stem;

[0007] The second sealing ring is fixedly connected to the lower end of the inner part of the valve body, and the second sealing ring is rotatably connected to the outer surface of the valve stem.

[0008] Preferably, a valve seat is provided at the bottom of the valve body, and the second sealing ring is fixedly connected to the valve seat.

[0009] Preferably, a gland is fixedly mounted on the top of the valve stem, and a third sealing ring is provided on the bottom of the gland.

[0010] Preferably, a bearing bushing is fixedly connected inside the valve body, and the bearing bushing is rotatably connected to the outer surface of the valve stem, and the bearing bushing is located on the upper and lower sides of the first sealing ring.

[0011] Preferably, a sealing sleeve is fixedly connected to the inner wall of the valve body, and the sealing sleeve is movably sleeved on the butterfly plate.

[0012] Preferably, a base is provided at the bottom of the valve seat, and the base is movably sleeved with the valve stem.

[0013] The utility model discloses a soft-sealed butterfly valve, which has the following beneficial effects: by arranging a first sealing ring and a second sealing ring inside the valve body, the medium is blocked from contacting the valve stem when the medium passes through the valve body, making it less likely to corrode and leak; a pressure cover is arranged on the top of the valve stem to fix the valve stem and prevent the valve stem from flying out due to excessive pressure in the pipeline, thereby solving the problem of low service life of traditional soft-sealed butterfly valves and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a side view of the structure of the utility model;

[0016] Figure 2 This is a front view of the structure of the utility model;

[0017] Figure 3 It is a cross-sectional view of structure B of the utility model;

[0018] Figure 4 It is a cross-sectional view of structure A of the utility model.

[0019] In the figure: 1. valve body; 2. bearing bushing; 3. valve seat; 4. butterfly plate; 5. valve stem; 6. first sealing ring; 7. second sealing ring; 8. third sealing ring; 9. gland; 10. base; 11. sealing sleeve. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The embodiment of the present application solves the problem of low service life of traditional soft-sealed butterfly valves by providing a soft-sealed butterfly valve, thereby improving safety.

[0022] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The utility model embodiment discloses a soft sealing butterfly valve.

[0024] According to the attached Figure 1-4 As shown, a soft-sealed butterfly valve comprises a valve body 1, a butterfly plate 4 is arranged inside the valve body 1, a valve stem 5 is fixedly connected in the middle of the butterfly plate 4, and sealing mechanisms are arranged at both ends of the valve stem 5, including: a first sealing ring 6, which is fixedly connected to the upper end of the valve body 1, and the first sealing ring 6 is rotatably connected to the outer surface of the valve stem 5; a second sealing ring 7, which is fixedly connected to the lower end of the valve body 1, and the second sealing ring 7 is rotatably connected to the outer surface of the valve stem 5. When the medium needs to pass through, the valve stem 5 is moved to drive the butterfly plate 4 to rotate inside the valve body 1, so that the butterfly plate 4 changes from 0° to 90°. When it rotates to 90°, the butterfly valve is in a fully open state. Since both ends of the valve stem 5 are A sealing mechanism is provided, and the medium will be blocked by the first sealing ring 6, the second sealing ring 7, and the third sealing ring 8. The valve stem 5 will not contact the medium, and is not prone to corrosion and leakage, thereby extending the service life of the valve. A pressure cap 9 is provided on the top of the valve stem 5. When the medium passes through the valve, pressure is generated inside the valve body 1. The pressure cap 9 fixes the valve stem 5 downward to prevent it from being pushed out by the pressure, thereby improving safety. When it is necessary to prevent the medium from passing through, the valve stem 5 is moved to drive the butterfly plate 4 to rotate inside the valve body 1, so that the butterfly plate 4 changes from 90° to 0°. When it rotates to 0°, the edge of the butterfly plate 4 is completely in contact with the sealing sleeve 11, and the butterfly plate 4 is in a fully closed state.

[0025] As a technical optimization solution of the utility model: a valve seat 3 is arranged at the bottom of the valve body 1 , and the second sealing ring 7 is fixedly connected to the valve seat 3 .

[0026] As a technical optimization solution of the utility model: a pressure cap 9 is fixedly installed on the top of the valve stem 5, and a third sealing ring 8 is arranged at the bottom of the pressure cap 9. Since sealing mechanisms are arranged at both ends of the valve stem 5, the medium will be blocked by the first sealing ring 6, the second sealing ring 7, and the third sealing ring 8. The valve stem 5 will not contact with the medium and will not be easily corroded and leaked, thereby extending the service life of the valve. A pressure cap 9 is arranged on the top of the valve stem 5. When the medium passes through the valve, pressure is generated inside the valve body 1. The pressure cap 9 fixes the valve stem 5 downward to prevent it from being pushed out by the pressure, thereby improving safety.

[0027] As a technical optimization solution of the utility model: a bearing bushing 2 is fixedly connected inside the valve body 1, and the bearing bushing 2 is rotatably connected to the outer surface of the valve stem 5. The bearing bushing 2 is located on the upper and lower sides of the first sealing ring 6, and the bearing bushing 2 plays a role in fixing the first sealing ring 6.

[0028] As a technical optimization solution of the utility model: a sealing sleeve 11 is fixedly connected to the inner wall of the valve body 1, and the sealing sleeve 11 is movably sleeved on the butterfly plate 4. When it is necessary to prevent the medium from passing through, the valve stem 5 is turned to drive the butterfly plate 4 to rotate inside the valve body 1, so that the butterfly plate 4 changes from 90° to 0°. When it rotates to 0°, the edge of the butterfly plate 4 is completely in contact with the sealing sleeve 11, and the butterfly plate 4 is in a fully closed state.

[0029] As a technical optimization solution of the utility model: a base 10 is arranged at the bottom of the valve seat 3 , and the base 10 is movably sleeved with the valve stem 5 , and the base 10 plays a role in fixing and restricting the valve stem 5 .

[0030] This device blocks the contact between the medium and the valve stem 5 when the medium passes through the valve body 1 by setting the first sealing ring 6 and the second sealing ring 7 inside the valve body 1, making it less likely to corrode and leak. A pressure cap 9 is set on the top of the valve stem 5 to fix the valve stem 5 and prevent the valve stem 5 from flying out due to excessive pressure in the pipeline, thereby solving the problem of low service life of traditional soft-sealed butterfly valves and improving safety.

[0031] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A soft-sealed butterfly valve, comprising a valve body (1), a butterfly plate (4) disposed inside the valve body (1), a valve stem (5) fixedly connected to the middle of the butterfly plate (4), characterized in that: The valve stem (5) is provided with sealing mechanisms at both ends, comprising: A first sealing ring (6) is fixedly connected to the upper end of the valve body (1), and the first sealing ring (6) is rotatably connected to the outer surface of the valve stem (5); A second sealing ring (7) is fixedly connected to the lower end of the valve body (1), and the second sealing ring (7) is rotatably connected to the outer surface of the valve stem (5); A valve seat (3) is provided at the bottom of the valve body (1), and a second sealing ring (7) is fixedly connected to the valve seat (3); A gland (9) is fixedly mounted on the top of the valve stem (5), and a third sealing ring (8) is arranged on the bottom of the gland (9).

2. A soft-sealed butterfly valve according to claim 1, characterized in that: A bearing bushing (2) is fixedly connected inside the valve body (1), and the bearing bushing (2) is rotatably connected to the outer surface of the valve stem (5). The bearing bushing (2) is located on the upper and lower sides of the first sealing ring (6).

3. A soft-sealed butterfly valve according to claim 1, characterized in that: A sealing sleeve (11) is fixedly connected to the inner wall of the valve body (1), and the sealing sleeve (11) is movably sleeved on the butterfly plate (4).

4. A soft-sealed butterfly valve according to claim 1, characterized in that: A base (10) is provided at the bottom of the valve seat (3), and the base (10) is movably sleeved with the valve stem (5).

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