Impact-resistant butterfly valve with butterfly plate coated with rubber and double sealing pairs

Abstract

The utility model discloses an anti-impact butterfly valve with a rubber-coated butterfly plate and double sealing pairs, which structurally comprises a valve body, the butterfly plate, a valve rod, a handle component and the like, the butterfly plate is formed by vulcanizing and rubber-coating a disc-shaped framework, and an annular sealing surface is formed on the outer circumferential surface of the butterfly plate. An annular groove and double sealing pairs are arranged on the sealing face in a circumferential surrounding mode. Therefore, when the butterfly plate is driven to rotate, the double sealing pairs are driven to be in contact with the valve body or separated from the valve body so as to seal and open the valve, and compared with a traditional butterfly plate, the double contact sealing is equivalent to one more sealing defensive line, so that the butterfly valve has more reliable sealing performance and can be used under severe working conditions; more stable support can be provided for the butterfly plate, and the impact of a water hammer can be effectively counteracted; meanwhile, a process parting line formed by rubber vulcanization and rubber coating can also be arranged in the annular groove and does not make contact with the valve body all the time in the rotating process of the butterfly plate, and therefore poor sealing performance caused by flaws at the position of the process parting line is avoided.

Description

Technical Field

[0001] This utility model relates to a butterfly valve structure in pipeline valves, specifically a butterfly valve with a double-seal pair and a rubber-coated butterfly plate to resist impact. Background Technology

[0002] Currently, traditional butterfly valves on the market that use rubber-coated butterfly plates all have butterfly plates formed by rubber vulcanization and molding through an internal disc-shaped skeleton. The outer circumference of the butterfly plate is coated with rubber to form an annular sealing surface. The parting line of this rubber vulcanization process is as follows: Figure 5 As shown, the butterfly plate is located on the sealing surface. Therefore, when the butterfly plate is driven to rotate and the sealing surface contacts or detaches from the valve body to achieve the valve's sealing opening and closing, the process parting line will also contact the valve body along with the sealing surface. Since rubber usually remains on the process parting line, minor defects require manual repair, while serious defects are considered defective and scrapped. However, even after repair, the sealing surface will still have some unevenness, which will seriously affect the sealing performance of the butterfly plate. Especially in low-pressure working environments, leakage is very likely to occur, resulting in unstable product performance and uncontrollable quality, as well as waste from rework and defective products entering the market. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a butterfly valve with a double sealing pair and more reliable sealing performance.

[0004] The technical problem of this utility model is solved by the following technical solution:

[0005] An anti-impact butterfly valve with a double-seal pair and rubber-coated disc includes a valve body, a channel within the valve body, a disc disposed within the channel, a valve stem connected to the disc, and a handle assembly for driving the valve stem to rotate the disc within the channel. The disc is formed by rubber vulcanization and coating of a disc-shaped skeleton, and the outer circumference of the disc forms an annular sealing surface through the coating. The sealing surface has an annular groove arranged around its circumference, and a double-seal pair is formed on the sealing surface by the annular groove. The disc is driven to rotate, causing the double-seal pair to contact or detach from the valve body, thereby achieving sealing and opening / closing within the channel. The process parting line formed by the rubber vulcanization and coating is disposed within the annular groove, and this process parting line never contacts the valve body during the rotation of the disc.

[0006] The dual sealing pairs are located on both sides of the annular groove.

[0007] The process parting line is formed around the center of the annular groove.

[0008] The cross-section of the annular groove is V-shaped.

[0009] The handle assembly includes a handle with one end connected to the valve stem and the other end suspended as the operating end. The handle is provided with an elastic grip, which engages or disengages with the toothed plate on the valve body, thereby locking or unlocking the rotation operation of the handle.

[0010] Compared with existing technologies, this utility model mainly features a circumferentially arranged annular groove on the sealing surface, forming a double sealing pair on the sealing surface through this groove. When the butterfly plate is driven to rotate, the double sealing pair contacts or disengages from the valve body, thereby achieving the sealing and opening / closing of the valve. Since this double-contact sealing is equivalent to an additional sealing layer compared to the traditional single-contact sealing achieved directly through the sealing surface of the butterfly plate, even if one sealing pair fails in actual use, leakage can still be guaranteed, resulting in more reliable sealing performance and better suitability for harsh working conditions. In particular, the double sealing pair provides more stable support for the butterfly plate and effectively counteracts the impact of water hammer. Simultaneously, the process parting line formed by the rubber vulcanization coating can also be set within the annular groove, and this process parting line never contacts the valve body during the rotation of the butterfly plate, thus avoiding poor sealing performance caused by defects at the process parting line. Attached Figure Description

[0011] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0012] Figure 2 A cross-sectional view showing how the double-sealed contact valve body of the butterfly plate achieves a sealed closure.

[0013] Figure 3 for Figure 2 Enlarged view of point A.

[0014] Figure 4 This is a schematic diagram of the butterfly plate.

[0015] Figure 5 This is a schematic diagram of the existing butterfly plate. Detailed Implementation

[0016] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0017] like Figures 1-4 As shown, 1. Valve body, 11. Channel, 12. Toothed plate, 2. Butterfly plate, 21. Skeleton, 22. Rubber coating, 23. Sealing surface, 231. Annular groove, 232. Double sealing pair, 233. Process parting line, 3. Valve stem, 31. Double O-ring, 32. Copper bushing, 33. Snap ring, 34. Limiting ring, 4. Handle assembly, 41. Handle, 42. Semi-circular key, 43. Elastic grip.

[0018] A butterfly valve with a rubber-coated double-seal anti-impact plate is disclosed, relating to a pipeline valve used for media on / off switching, the structure of which is as follows: Figure 1 As shown, it mainly includes a valve body 1, a channel 11 inside the valve body, a butterfly plate 2 installed in the channel, a valve stem 3 connected to the butterfly plate, and a handle assembly 4 that drives the valve stem to rotate the butterfly plate 2 in the channel 11.

[0019] The rotation axis of the valve stem 3 and the butterfly plate 2 is perpendicular to the axis of the channel 11; the butterfly plate 2 is formed by rubber vulcanization and molding of a disc-shaped skeleton 21, and the outer circumference of the butterfly plate 2 forms an annular sealing surface 23 through the rubber coating 22.

[0020] The sealing surface 23 is provided with a circumferentially arranged annular groove 231, and a double sealing pair 232 is formed on the sealing surface by the annular groove; the cross-section of the annular groove 231 is V-shaped, and the double sealing pair 232 is located on both sides of the annular groove 231 and forms a symmetrical arrangement.

[0021] In this way, when the butterfly plate 2 is driven to rotate, it can drive the double sealing pair 232 to contact or disengage from the valve body, thereby realizing the sealing opening and closing within the channel 11. Since this double contact sealing is equivalent to an extra sealing line compared to the single contact sealing of the traditional butterfly plate directly through the sealing surface, even if one sealing pair fails in actual use, it can still ensure no leakage, making the sealing performance more reliable and better suited for use under harsh working conditions.

[0022] In particular, when the butterfly plate 2 is closed and sealed, the double sealing pair 232 is also stretched open and forms a figure-eight distribution. Therefore, the double sealing pair 232 can provide more stable support for the butterfly plate 2 and effectively offset the impact of water hammer.

[0023] The process parting line 233 formed by the rubber vulcanization coating can also be set in the annular groove 231, that is, the process parting line 233 is formed by wrapping around the center of the annular groove 231. Therefore, the process parting line 233 never contacts the valve body 1 during the rotation of the butterfly plate 2, thereby avoiding poor sealing performance of the sealing surface 23 caused by defects at the process parting line 233.

[0024] The valve stem 3 is vertically and rotatably sealed in the valve body 1 above the butterfly plate 2 by means of double O-rings 31. A copper bushing 32, a snap ring 33 and a limiting ring 34 are also provided between the valve stem 3 and the valve body 1 to facilitate valve stem installation.

[0025] The handle assembly 4 includes a handle 41 with one end connected to the valve stem 3 and the other end suspended as the operating end. One end of the handle is mainly connected to the exposed top of the valve stem 3 through a semi-circular key 42 and a hexagonal head bolt. Therefore, the operating end of the other end of the handle 41 can drive the valve stem 3 to rotate.

[0026] The handle 41 is provided with an elastic grip 43, which engages or disengages with the toothed plate 12 on the valve body 1, thereby locking or unlocking the rotation operation of the handle 41.

[0027] This utility model has the advantages of small size, light weight, convenient installation and maintenance, and can reduce the load on the pipeline system. It has excellent sealing performance, can achieve double-sided sealing with zero leakage, ensures that the flow direction of the medium in the pipeline system is unrestricted, and improves the versatility and flexibility of the valve.

[0028] In addition, this structure is suitable not only for low-pressure applications but also for medium- and high-pressure applications. It is flexible and unobstructed in opening and closing, has stable performance and a long service life, so it can be widely used in various water treatment industries, building water supply and drainage systems, fire protection system engineering, etc.

[0029] The above description is only a specific embodiment of this utility model. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included within the protection scope of this utility model.

Claims

1. A butterfly valve with a double-seal anti-impact design and a butterfly plate coated with rubber, comprising a valve body (1), a channel (11) within the valve body, a butterfly plate (2) disposed within the channel, a valve stem (3) connecting the butterfly plate, and a handle assembly (4) for driving the valve stem to rotate the butterfly plate (2) within the channel (11), wherein the butterfly plate (2) is formed by rubber vulcanization and coating of a disc-shaped frame (21), and the outer circumferential surface of the butterfly plate (2) forms an annular sealing surface (23) through the coating (22), characterized in that... The sealing surface (23) is provided with a circumferentially arranged annular groove (231) and a double sealing pair (232) formed on the sealing surface by the annular groove. The butterfly plate (2) is driven to rotate and drive the double sealing pair (232) to contact or detach from the valve body, thereby realizing the sealing opening and closing in the channel (11). The process parting line (233) formed by the rubber vulcanization is set in the annular groove (231), and the process parting line (233) never contacts the valve body (1) during the rotation of the butterfly plate (2).

2. The butterfly valve with a double-seal anti-impact design and a rubber-coated disc as described in claim 1, characterized in that... The dual sealing pairs (232) are located on both sides of the annular groove (231).

3. The butterfly valve with a double-seal anti-impact design and a rubber-coated disc as described in claim 1, characterized in that... The process parting line (233) is formed around the center of the annular groove (231).

4. The butterfly valve with a double-seal anti-impact design and a rubber-coated disc as described in claim 1, characterized in that... The cross-section of the annular groove (231) is V-shaped.

5. The butterfly valve with a double-seal anti-impact design and a rubber-coated disc as described in claim 1, characterized in that... The handle assembly (4) includes a handle (41) with one end connected to the valve stem (3) and the other end suspended as the operating end. The handle is provided with an elastic grip (43), and the elastic grip engages or disengages with the toothed plate (12) on the valve body (1), thereby locking or unlocking the rotation operation of the handle (41).

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