Dual seal stop valve

Abstract

The utility model discloses a double sealing stop valve, including the valve body, install the valve disc on the valve stem, install the valve body seal ring on the valve body with install the valve disc seal ring on the valve disc, the corresponding seal ring face of valve body seal ring and valve disc seal ring constitutes the sealing pair, and the valve stem rotatablely sealed support is on the valve cover, be equipped with the second seal ring face on the valve body seal ring, and the second seal ring face is located the inside of seal ring face on the valve body seal ring, install the air bag on the valve disc, and the air bag can be after the inflation and the second seal ring face on the valve body seal ring is pasted and constitutes the second sealing pair, and the air bag inner chamber is communicated through the inflation passageway on the valve disc, the valve stem and the valve cover with the inflation interface of installing on the valve cover. Adopt the double sealing stop valve of the utility model can form reliable sealing between the valve disc and the valve body, guarantees the cut -off effect of stop valve.

Description

Technical Field

[0001] This utility model relates to a valve, and more particularly to an improvement in the sealing performance of a gate valve. Background Technology

[0002] A gate valve is a type of valve that uses a valve stem to drive a valve disc to move up and down, thereby opening or closing the sealing pair between the valve disc and the valve body to open or close the fluid passage. The sealing pair between the valve disc and the valve body consists of a valve disc sealing ring mounted on the valve disc and a valve body sealing ring mounted on the fluid passage within the valve body. To ensure the gate valve's function of shutting off the fluid, the valve disc sealing ring and the valve body sealing ring must fit well together and be pressed tightly together by the valve stem. In many applications, the fluid flowing through the gate valve often carries oil, particles, or impurities. Once these oil, particles, or impurities adhere to the sealing surfaces of the valve disc sealing ring or the valve body sealing ring, the sealing pair will not close tightly, failing to guarantee the fluid shut-off requirements. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a double-sealed shut-off valve that can form a reliable seal between the valve disc and the valve body, so as to ensure the shut-off effect of the shut-off valve.

[0004] To solve the above-mentioned technical problems, this utility model provides a double-sealed shut-off valve, including a valve body, a valve disc mounted on a valve stem, a valve body sealing ring mounted on the valve body, and a valve disc sealing ring mounted on the valve disc. The corresponding sealing ring surfaces on the valve body sealing ring and the valve disc sealing ring form a sealing pair. The valve stem is rotatably and sealingly supported on the valve cover. A second sealing ring surface is provided on the valve body sealing ring. An air bladder is installed on the valve disc. After being inflated, the air bladder can fit against the second sealing ring surface on the valve body sealing ring to form a second sealing pair. The inner cavity of the air bladder is connected to the inflation port mounted on the valve cover through the inflation channels on the valve disc, valve stem, and valve cover.

[0005] After adopting the above technical solution, the shut-off function of the gate valve not only relies on the sealing pair formed by the conventional valve disc sealing ring and valve body sealing ring, but also forms a second sealing pair through the air bladder installed on the valve disc and the second sealing ring surface on the valve body sealing ring. This gives the gate valve a dual sealing effect. The inner cavity of the air bladder is connected to the inflation port installed on the valve cover through the inflation channels on the valve disc, valve stem and valve cover, and is connected to an external compressed air source for inflation. After inflation, the outer surface of the air bladder will fit tightly with the second sealing ring surface on the valve body sealing ring. Even if the conventional sealing pair formed by the valve disc sealing ring and valve body sealing ring fails to close tightly due to oil, dirt or particles and impurities adhering to the sealing surface, the second sealing pair can still play a sealing role through the inflation of the air bladder. Thus, a reliable seal can be formed between the valve disc and the valve body, ensuring the shut-off effect of the gate valve.

[0006] In a preferred embodiment of this invention, the second sealing ring surface is a conical surface, which is disposed on the inner side of the sealing ring surface on the valve body sealing ring. With this embodiment, the conical second sealing ring surface can easily fit well with the inflated airbag, resulting in a good sealing effect.

[0007] In another preferred embodiment of this invention, the airbag is an annular airbag, which is mounted on the inner side of the valve disc sealing ring via an airbag mounting seat. With this embodiment, the annular airbag is smaller in size, easier to install, and can form a better sealing pair with the second sealing pair with a larger diameter conical surface.

[0008] In another preferred embodiment of this invention, an air nozzle is provided on the airbag, and the air nozzle is sealed and inserted into the inflation channel on the valve disc. With this embodiment, the airbag is sealed and inserted into the inflation channel via the air nozzle, facilitating communication between the compressed air source and the inner cavity of the airbag.

[0009] In a further preferred embodiment of this invention, the airbag mounting ring includes an annular airbag mounting groove, the airbag is embedded in the annular airbag mounting groove, and the lower part of the airbag is located outside the airbag mounting groove. With this embodiment, the airbag is installed stably and reliably, and the lower part of the airbag located outside the airbag mounting groove can reliably fit against the second sealing ring surface.

[0010] In another further preferred embodiment of this invention, the lower part of the cross-section of the airbag is arc-shaped. With this embodiment, the lower part of the arc-shaped airbag cross-section can fit well with the second sealing pair on the conical surface, resulting in a good sealing effect.

[0011] In another preferred embodiment of this utility model, the valve disc is mounted on the valve stem via a nut at the lower end of the valve stem. Two sealing rings, upper and lower, are provided between the valve disc and the valve stem. The inflation channel on the valve disc and the inflation channel on the valve stem are connected between the upper and lower sealing rings. This embodiment ensures that compressed gas will not leak during the inflation of the airbag, and that the fluid flowing within the valve body will not leak outwards through the inflation channel.

[0012] In a further preferred embodiment of this invention, the inflation channel on the valve stem is connected to the inflation port on the valve cover via the side of the valve stem, and valve stem sealing pairs are respectively provided at the upper and lower ends of the inflation channel on the valve cover. With this embodiment, the inflation port is conveniently located for connection to an external compressed air source, and the connection between the inflation channel on the valve stem and the inflation port on the valve cover is unobstructed and ensures a seal. Attached Figure Description

[0013] The present invention's double-sealed stop valve will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of a specific embodiment of the double-sealed shut-off valve of this utility model;

[0015] Figure 2 yes Figure 1 A magnified view of part I in the structure shown;

[0016] Figure 3 yes Figure 1 A magnified view of part II in the structure shown.

[0017] In the diagram: 1-Valve body, 2-Nut, 3-Valve body sealing ring, 4-Second sealing pair, 5-Second sealing ring face, 6-Sealing pair, 7-Valve disc sealing ring, 8-Airbag, 9-Inflation channel, 10-Sealing ring, 11-Valve disc, 12-Valve stem, 13-Valve stem sealing pair, 14-Inflation interface, 15-Valve cover, 16-Airbag mounting groove, 17-Air nozzle, 18-Airbag mounting seat ring. Detailed Implementation

[0018] exist Figure 1 In the double-sealed shut-off valve shown, the valve stem 12 is rotatably supported by a valve stem sealing pair 13 and screwed onto the valve cover 15. The valve cover 15 is mounted on the upper port of the valve body 1. A valve disc 11 is mounted on the lower end of the valve stem 12 via a nut 2. A valve body sealing ring 3 is mounted on the fluid passage of the valve body 1, and a valve disc sealing ring 7 is mounted on the valve disc 11. The lower plane of the valve disc sealing ring 7 and the upper plane of the valve body sealing ring 3 are corresponding sealing ring surfaces. The corresponding sealing ring surfaces of the valve body sealing ring 3 and the valve disc sealing ring 7 constitute a sealing pair 6. See also Figure 3 A second sealing ring surface 5 is provided on the valve body sealing ring 3. The second sealing ring surface 5 is a conical surface, which is located on the inner side of the sealing ring surface on the valve body sealing ring 3. An airbag 8 is installed on the valve disc 11. The airbag 8 is installed on the inner side of the valve disc sealing ring 7 through the airbag mounting seat ring 18. The airbag 8 is preferably an annular airbag. The airbag mounting seat ring 18 includes an annular airbag mounting groove 16. The annular airbag 8 is embedded in the annular airbag mounting groove 16. For reliable installation, the bottom of the airbag mounting groove 16 and the airbag 8 can be glued together with adhesive. The lower part of the airbag 8 is located outside the airbag mounting groove 16. The lower part of the cross section of the airbag 8 located outside the airbag mounting groove 16 is arc-shaped. After the airbag 8 is inflated and expanded, it can fit with the second sealing ring surface 5 on the valve body sealing ring 3 to form a second sealing pair 4. Air inlet channels 9 are provided on the valve disc 11, valve stem 12, and valve cover 15. Two sealing rings 10 are provided between the valve disc 11 and valve stem 12. The air inlet channels 9 on the valve disc 11 and valve stem 12 are connected between the two sealing rings 10. (See also...) Figure 2The inflation channel 9 on the valve stem 12 is connected to the inflation port 14 on the valve cover 15 via the inflation channel 9 on the valve cover 15. The upper and lower ends of the inflation channel 9 on the valve cover 15 are respectively provided with valve stem sealing pairs 13 between the valve stem 12 and the valve cover 15. An air nozzle 17 is provided on the airbag 8. The air nozzle 17 is sealed and inserted into the inflation channel 9 on the valve disc 11 through a sealing ring. The inner cavity of the airbag 8 is connected to the inflation port 14 installed on the valve cover 15 via the inflation channels 9 on the valve disc 11, the valve stem 12 and the valve cover 15.

[0019] After the valve is closed by the valve stem 12 pressing the valve disc sealing ring 7 on the valve disc 11 against the valve body sealing ring 3, the inner cavity of the air bladder 8 is filled with pressurized gas through the inflation channels 9 and the inflation port 14 connected to the external pressure gas source. After inflation, the air bladder 8 expands and fits tightly against the second sealing ring surface 5 on the valve body sealing ring 3, forming a second sealing pair 4, thus creating a double seal for the valve and effectively ensuring the shut-off effect. When it is necessary to open the valve, the gas supply path between the inflation port 14 and the external pressure gas source is disconnected, and the inflation port 14 is connected to the outside atmosphere. The air bladder 8 contracts due to the release of internal pressure, detaching from the contact with the second sealing ring surface 5. Then, the valve disc 11 is raised by the valve stem 12, thus opening the liquid passage of the valve.

[0020] The above are only some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A double-sealed shut-off valve, comprising a valve body (1), a valve disc (11) mounted on a valve stem (12), a valve body sealing ring (3) mounted on the valve body (1), and a valve disc sealing ring (7) mounted on the valve disc (11), wherein the corresponding sealing ring surfaces of the valve body sealing ring (3) and the valve disc sealing ring (7) constitute a sealing pair (6), and the valve stem (12) is rotatably and sealingly supported on a valve cover (15), characterized in that: A second sealing ring surface (5) is provided on the valve body sealing ring (3), and an air bag (8) is installed on the valve disc (11). After the air bag (8) is inflated, it can fit with the second sealing ring surface (5) on the valve body sealing ring (3) to form a second sealing pair (4). The inner cavity of the air bag (8) is connected to the inflation port (14) installed on the valve cover (15) through the inflation channel (9) on the valve disc (11), valve stem (12) and valve cover (15).

2. The double-sealed shut-off valve according to claim 1, characterized in that: The second sealing ring surface (5) is a conical surface, which is located on the inner side of the sealing ring surface on the valve body sealing ring (3).

3. The double-sealed shut-off valve according to claim 1, characterized in that: The airbag (8) is an annular airbag, which is mounted on the inner side of the valve disc sealing ring (7) via an airbag mounting seat ring (18).

4. The double-sealed shut-off valve according to claim 1 or 3, characterized in that: An air nozzle (17) is provided on the airbag (8), which is sealed and inserted into the inflation channel (9) on the valve disc (11).

5. The double-sealed shut-off valve according to claim 3, characterized in that: The airbag mounting ring (18) includes an annular airbag mounting groove (16), in which the airbag (8) is fitted, with the lower part of the airbag (8) located outside the airbag mounting groove (16).

6. The double-sealed shut-off valve according to claim 1 or 3, characterized in that: The lower part of the cross-section of the airbag (8) is arc-shaped.

7. The double-sealed shut-off valve according to claim 1, characterized in that: The valve disc (11) is mounted on the valve stem (12) via a nut (2) at the lower end of the valve stem (12). There are two sealing rings (10) between the valve disc (11) and the valve stem (12). The air passage (9) on the valve disc (11) and the air passage (9) on the valve stem (12) are connected between the two sealing rings (10).

8. The double-sealed shut-off valve according to claim 1, characterized in that: The air passage (9) on the valve stem (12) is located on the side of the valve stem (12) and the valve cover (15). The inflation port (14) on the valve cover (15) is connected to the valve stem (12) and the valve stem sealing pair (13) between the valve stem (12) and the valve cover (15) is provided at the upper and lower ends of the inflation channel (9) on the valve cover (15).

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