Valve assembly with emergency seal and flat gate valve adopting same

Abstract

The utility model relates to the field of valves, in particular to a valve assembly with emergency sealing and a flat gate valve adopting the valve assembly. On one hand, the valve assembly with the emergency sealing function comprises a valve body, a spring seat and a valve seat; a mounting groove is formed in the valve body, the spring seat is arranged in the mounting groove, and the valve seat is arranged on the side, opposite to the valve body, of the spring seat. An emergency sealing cavity is formed between the spring seat and the valve body, and a pushing face is arranged on the spring seat and serves as the side wall of the emergency sealing cavity. The valve body is further provided with a pressurization channel communicating with the emergency sealing cavity. On the other hand, the utility model provides a flat gate valve which comprises the valve body and a valve plate arranged in the valve body. When the valve seat seal is abraded, fluid is injected into the emergency sealing cavity through the pressurizing channel, the spring seat is pushed to further press the valve seat, emergency sealing is achieved, and the sealing effect of the valve in the high-pressure fluid environment is improved.

Description

Technical Field

[0001] The present application relates to the field of valves, and in particular to a valve assembly with an emergency seal and a flat gate valve using the valve assembly. Background Art

[0002] The flat gate valve is a valve widely used in fluid control systems. It is suitable for controlling the delivery of various fluids, including water, steam, oil, gas, etc. It is used for functions such as cut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief.

[0003] The flat gate valve usually includes a valve body, a valve plate and a valve seat, and the valve seat cooperates with the valve plate to achieve sealing. In addition, the flat gate valve usually has the advantage of bidirectional sealing, that is, the upstream and downstream valve seats of the flat gate valve can achieve sealing at the same time. The specific implementation method is: when the gate is closed, the fluid inside the pipeline reaches the inner cavity of the valve body through the upstream valve seat, and then pushes the upstream valve seat back to push the sealing surface of the upstream valve seat toward the gate to achieve sealing, and the downstream valve seat abuts against the valve plate under the action of the spring preload to achieve sealing.

[0004] However, when the valve works for a long time and causes slight wear of the valve seat seal, the downstream valve seat relies on the spring preload to achieve sealing, and its sealing effect will deteriorate, making it difficult to cope with high-pressure fluids. Utility Model Content

[0005] In order to ensure the sealing effect of the flat gate valve, the present application provides a valve assembly with an emergency seal and a flat gate valve using the valve seat.

[0006] On the one hand, the present application provides a valve assembly with an emergency seal, which adopts the following technical solution:

[0007] A valve assembly with an emergency seal comprises a valve body, a spring seat and a valve seat; the valve body is provided with a mounting groove, the spring seat is arranged in the mounting groove, and the valve seat is arranged on a side of the spring seat facing away from the valve body;

[0008] An emergency sealing cavity is arranged between the spring seat and the valve body, a push surface is arranged on the spring seat, and the push surface serves as a side wall of the emergency sealing cavity; a pressurizing channel communicating with the emergency sealing cavity is also arranged on the valve body.

[0009] By adopting the above technical solution, when the valve works for a long time and causes slight wear of the seal, compressed air or hydraulic pressure can be added through the boosting channel. The compressed air or hydraulic pressure enters the emergency sealing chamber, which generates thrust to press the spring seat against the valve seat, thereby increasing the preload force to achieve emergency sealing.

[0010] Preferably, the emergency sealing chamber is arranged in an annular shape and surrounds the circumference of the spring seat.

[0011] By adopting the above technical solution, the annular emergency sealing cavity structure can better adapt to the shape of the spring seat, and at the same time provide uniform sealing pressure, further enhancing the sealing effect.

[0012] Preferably, a plurality of the emergency sealing cavities are provided and are evenly distributed around the circumferential side of the spring seat.

[0013] By adopting the above technical solution, the arrangement of a plurality of emergency sealing cavities and the pressurizing channels can achieve a more uniform sealing pressure distribution, improving the reliability of the seal.

[0014] Preferably, a plurality of the pressurizing channels are provided and correspond to the plurality of emergency sealing cavities one by one.

[0015] By adopting the above technical solution, air pressure or hydraulic pressure can be introduced into each emergency sealing cavity simultaneously, thereby improving the uniformity of the force on the valve seat.

[0016] Preferably, the pushing surface is arranged as a concave surface.

[0017] By adopting the above technical solution, the concave-designed pushing surface can increase the acting area of the fluid pressure, thereby improving the sealing efficiency and ensuring the stability of the sealing performance in a high-pressure fluid environment.

[0018] Preferably, a first sealing ring and a second sealing ring are arranged on the spring seat, both the first sealing ring and the second sealing ring are in contact with the valve body, and the emergency sealing cavity is arranged between the first sealing ring and the second sealing ring.

[0019] By adopting the above technical solution, the close contact between the first sealing ring and the second sealing ring and the valve body can form an additional sealing barrier to prevent the fluid in the pipeline from entering the emergency sealing cavity, thereby ensuring the normal operation of the valve assembly.

[0020] Preferably, a tubular part is arranged on the valve seat, and the tubular part is inserted inside the spring seat; a sliding seal is arranged between the tubular part and the spring seat; the inner wall of the tubular part is flush with the inner wall of the valve body.

[0021] By adopting the above technical solution, the insertion design of the tubular part and the spring seat facilitates assembly. At the same time, the arrangement of the sliding seal can ensure the sealing performance between the tubular part and the spring seat, ensuring that the fluid does not leak through here. The flush design of the inner wall of the tubular part and the inner wall of the valve body can ensure the smoothness of the fluid flow and reduce the flow resistance.

[0022] On the other hand, the present application provides a parallel slide gate valve, adopting the following technical solution:

[0023] A parallel slide gate valve includes the above-mentioned valve body and a valve plate arranged inside the valve body.

[0024] By adopting the above technical solution, due to the adoption of the above valve seat structure with emergency sealing, the flat gate valve can still maintain good sealing performance under long-term use and high-pressure environment, improving the service life and reliability of the valve.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. In the present application, an emergency sealing cavity is provided between the spring seat and the valve body. When the valve works for a long time and the seal is slightly worn, compressed air or hydraulic pressure can be added through the pressurizing channel. The compressed air or hydraulic pressure enters the emergency sealing cavity, and the thrust generated by it makes the spring seat press against the valve seat, thereby increasing the pre-tightening force to achieve emergency sealing.

[0027] 2. Through the combined use of multiple sealing rings and sliding seals, the sealing reliability and service life of the valve are further enhanced. The flat gate valve integrated with this valve seat has excellent fluid control ability and is widely applicable to various fluid control systems. Description of the Drawings

[0028] Figure 1 It is a cross-sectional view of the valve assembly with emergency sealing in the embodiment of the present application for showing its internal structure.

[0029] Reference numerals in the drawings: 1, valve body; 2, spring seat; 21, pushing surface; 3, valve seat; 31, tubular part; 4, emergency sealing cavity; 5, pressurizing channel; 6, first sealing ring; 7, second sealing ring; 8, sliding seal. Detailed Description of the Embodiment

[0030] The following will further elaborate on the present application in conjunction with the attached Figure 1 for further detailed description of the present application.

[0031] This embodiment discloses a valve assembly with emergency sealing, including a valve body 1, a spring seat 2 and a valve seat 3. An installation groove is provided on the valve body 1, and the spring seat 2 is installed in this installation groove. The valve seat 3 is installed on the side of the spring seat 2 facing away from the valve body 1. An emergency sealing cavity 4 is provided between the spring seat 2 and the valve body 1. The valve body 1 is provided with a pressurizing channel 5 connected to the emergency sealing cavity 4. Compressed air or hydraulic pressure can be added through the pressurizing channel 5. The compressed air or hydraulic pressure enters the emergency sealing cavity 4. A pushing surface 21 is provided on the spring seat 2, and this pushing surface 21 serves as the side wall of the emergency sealing cavity 4. The compressed air or hydraulic pressure acts on the pushing surface 21 to generate a thrust, making the spring seat 2 press against the valve seat 3, thereby increasing the pre-tightening force of the valve seat 3 to achieve emergency sealing.

[0032] Preferably, the emergency sealing cavity 4 can be set as an annular shape and surround the circumferential side of the spring seat 2 to facilitate providing uniform and continuous sealing pressure. As an alternative solution, multiple emergency sealing cavities 4 can also be provided and evenly distributed around the spring seat 2, thereby improving the uniformity of the force on the spring seat 2. Correspondingly, the valve body 1 is equipped with a pressurizing channel 5 connected to each emergency sealing cavity 4. When it is necessary to enhance the sealing performance of the valve, fluid can be injected into the emergency sealing cavity 4 through these pressurizing channels 5.

[0033] The pushing surface 21 can be set as a flat surface or can also adopt a concave shape to increase the contact area between the fluid and it, thereby enhancing the thrust.

[0034] On the spring seat 2, a first sealing ring 6 and a second sealing ring 7 can also be added. Both of these sealing rings are in close contact with the valve body 1, providing an additional static sealing layer for the valve to prevent the fluid in the pipeline from entering the emergency sealing cavity 4.

[0035] The valve seat 3 is also provided with a tubular part 31. The tubular part 31 is inserted inside the spring seat 2, enhancing the structural stability of the valve seat 3 and at the same time being able to protect the spring seat 2. A sliding seal 8 is also provided in the gap between the tubular part 31 and the spring seat 2. The sliding seal 8 uses an O-ring to provide sealing and reduce the friction and wear between the tubular part 31 and the spring seat 2.

[0036] This embodiment also discloses a parallel slide gate valve, which includes the valve assembly with emergency sealing and the valve plate as described above.

[0037] Under normal circumstances, the valve seat 3 achieves preliminary sealing by relying on the pre-tightening force of the spring seat 2 and the cooperation of the valve body 1. When the seal of the valve seat 3 is worn due to long-term use, especially in a high-pressure environment and the sealing effect decreases, fluid can be injected into the emergency sealing cavity 4 through the pressurizing channel 5. As the fluid pressure increases, the fluid will push the spring seat 2 to further press against the valve seat 3, compensating for the wear and achieving emergency sealing. This design significantly improves the sealing performance and service life of the valve in a high-pressure environment. At the same time, through the combined use of multiple sealing rings and the sliding seal 8, the sealing reliability and service life of the valve are further enhanced. And the parallel slide gate valve integrated with this valve seat 3 has excellent fluid control capabilities and is widely applicable to various fluid control systems.

[0038] The above are all the preferred embodiments of this application. It does not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A valve assembly with emergency sealing, characterized in that: It includes a valve body (1), a spring seat (2) and a valve seat (3); an installation groove is formed on the valve body (1), the spring seat (2) is arranged in the installation groove, and the valve seat (3) is arranged on the side of the spring seat (2) facing away from the valve body (1). An emergency sealing cavity (4) is arranged between the spring seat (2) and the valve body (1), a pushing surface (21) is arranged on the spring seat (2), and the pushing surface (21) serves as the side wall of the emergency sealing cavity (4); a pressure increasing channel (5) communicating with the emergency sealing cavity (4) is further formed on the valve body (1).

2. The valve assembly with emergency sealing according to claim 1, characterized in that: The emergency sealing cavity (4) is annularly arranged and surrounds the circumferential side of the spring seat (2).

3. The valve assembly with emergency sealing according to claim 1, characterized in that: A plurality of emergency sealing cavities (4) are arranged and are evenly distributed around the circumferential side of the spring seat (2).

4. The valve assembly with emergency sealing according to claim 3, characterized in that: A plurality of pressure increasing channels (5) are arranged and correspond to the plurality of emergency sealing cavities (4) one by one.

5. The valve assembly with emergency sealing according to claim 1, characterized in that: The pushing surface (21) is concave.

6. The valve assembly with emergency sealing according to claim 1, characterized in that: A first sealing ring (6) and a second sealing ring (7) are arranged on the spring seat (2), both the first sealing ring (6) and the second sealing ring (7) are in contact with the valve body (1), and the emergency sealing cavity (4) is arranged between the first sealing ring (6) and the second sealing ring (7).

7. The valve assembly with emergency sealing according to claim 1, characterized in that: A tubular portion (31) is arranged on the valve seat (3), and the tubular portion (31) is inserted inside the spring seat (2); a sliding seal (8) is arranged between the tubular portion (31) and the spring seat (2); the inner wall of the tubular portion (31) is flush with the inner wall of the valve body (1).

8. A parallel slide gate valve, characterized in that: It includes the valve body (1) according to any one of claims 1-7, and a valve plate arranged inside the valve body (1).

Images