Isolation butterfly valve for high-risk toxic medium

Abstract

The utility model provides an isolation butterfly valve for a high-risk toxic medium, which comprises a valve body, a valve rod and a butterfly plate, a plurality of channels communicated with the downstream are arranged on one side, close to the downstream of the valve, of the butterfly plate in a closed state, the channels extend to the outside of the valve through the valve rod, a vacuum channel interface is arranged outside the valve, and the vacuum channel interface is connected with vacuumizing equipment. The hollow rectangular steel ring is used for replacing a multi-layer sealing ring, the sealing effect is improved, a plurality of small holes are formed in the downstream direction of the hollow rectangular steel ring, trace high-risk poisonous media leaked from the periphery can be subjected to vacuum pumping, finally, an internal complete gas transmission channel is formed through a threaded connector in the lower end cover, and then an external vacuum system is used for conducting vacuum pumping on the gas transmission channel. And trace poison gas is actively extracted from the sealed downstream and is safely treated at the rear end.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and specifically relates to an isolating butterfly valve for high-risk toxic media. Background Art

[0002] The petrochemical industry is an important industrial sector, but at the same time it is also a serious environmental pollution source. During the production process of petrochemical products, a large amount of toxic gas media will be used or produced, such as hydrogen sulfide, hydrogen fluoride, chlorine, ammonia, and sulfur dioxide. The direct emission of these toxic gases will have an adverse impact on people's life and health, agricultural production, and the ecological environment. To prevent these toxic gases from harming the environment and the public, strict control is required during transportation, and at the same time, good sealing work should be done to prevent leakage from harming the staff.

[0003] Traditional isolating butterfly valves are used for the pipeline transportation of toxic media. Traditional isolating butterfly valves usually have a triple-eccentric structure and multi-layer sealing rings, and rely on increasing the torque to strengthen the sealing effect as much as possible. This is a torque sealing structure, which cannot solve the problem of sealing leakage caused by the increase in the opening and closing frequency and the wear of the sealing surface. As the sealing system wears, valve leakage is inevitable and the sealing effect cannot be effectively compensated. Due to the continuous leakage of the valve, it will cause certain harm to maintenance personnel during maintenance. Content of the Utility Model

[0004] The purpose of the utility model is to provide a solution for actively isolating high-risk toxic media aiming at the shortcomings of the existing technology. This solution can greatly reduce the harm caused by sealing leakage, ensure the safe, efficient, and rapid handling of trace amounts of high-risk toxic media leakage in the valve sealing system during sudden temporary repairs, utilize the vacuum system to evacuate the trace amounts of high-risk toxic media leaking from the leakage point at the sealing ring, and perform safe treatment, thereby reducing the system downtime, reducing the economic losses caused by excessive downtime, and ensuring the life safety of maintenance personnel.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An isolating butterfly valve for high-risk toxic media, including a valve body, a valve stem, and a disc. When the disc is in the closed state, several channels communicating with the downstream are provided on one side close to the downstream of the valve. These channels extend to the outside of the valve through the valve stem, and a vacuum channel interface is provided outside, and this vacuum channel interface is connected to a vacuum pumping device.

[0007] Preferably, a hollow sealing steel ring is connected to the disc. One side of the sealing steel ring is provided with several first through holes communicating with the downstream, and the other side is provided with second through holes communicating with the disc channel.

[0008] Preferably, a pressing plate for pressing and fixing the sealing steel ring on the disc plate is provided outside the sealing steel ring.

[0009] Preferably, the disc plate and the valve stem are fixedly matched through a pin shaft.

[0010] Preferably, a sealing gasket is provided between the sealing steel ring and the disc plate, and an O-ring seal is provided at the channel connection between the disc plate and the valve stem.

[0011] Preferably, a lower end cover is provided on the valve body below the valve stem, a vacuum channel interface is provided on the lower end cover, and a sealing assembly is provided at the channel between the lower end cover and the valve stem.

[0012] Preferably, the sealing assembly includes a transition pipe, which is a hollow pipe fitting. The two ends of the transition pipe are respectively connected to the internal channel of the valve stem and the internal channel of the lower end cover. One end of the transition pipe is inserted into the valve stem, and the other end is inserted into the lower end cover. Sealing rings are provided between the outer wall of the transition pipe and the valve stem and between the outer wall of the transition pipe and the lower end cover.

[0013] Preferably, a counterbore for inserting the transition pipe is provided inside both the valve stem and the lower end cover.

[0014] The beneficial effects of the present utility model are as follows: The present utility model uses an inner hollow rectangular steel ring to replace multi-layer sealing rings, improving the sealing effect. By means of several small holes opened in its downstream direction, trace amounts of highly dangerous and toxic media leaking around can be evacuated by vacuum. Finally, a complete internal gas transmission channel is formed through the threaded interface on the lower end cover. Then, with the help of an external vacuum system, the trace amounts of poisonous gas are actively extracted from the downstream of the seal and safely treated at the rear end. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a partial cross-sectional view of the present utility model;

[0016] Figure 2 is Figure 1 the enlarged view of A in

[0017] Figure 3 is the front view of the sealing steel ring of the present utility model;

[0018] Figure 4 is the right view of the sealing steel ring of the present utility model;

[0019] Figure 5 is the rear view of the sealing steel ring of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0021] Embodiment

[0022] Please refer to Figures 1 - 5 , as shown in the figure, a isolating butterfly valve for high-risk toxic media is shown, which includes a valve body 4, a valve stem 5, and a disc 9. The disc 9 and the valve stem 5 are fixedly matched through a pin shaft 8. A lower end cover is provided on the valve body 4 below the valve stem 5. When the disc 9 is in the closed state, several channels communicating with the downstream are provided on the side close to the downstream of the valve. These channels extend to the outside of the valve through the valve stem 5, and a vacuum channel interface 13 is provided outside, and this vacuum channel interface is connected to a vacuum pumping device. The above channels include a disc 9 part, a valve stem 5 part, and an end cover part. The disc 9 part is a through hole, the valve stem 5 part is an L-shaped hole, and the end cover part is also a through hole. The through hole of the disc 9 part communicates with one end of the L-shaped hole on the valve stem 5, and the L-shaped hole on the valve stem 5 communicates with the through hole on the end cover, thus jointly forming a channel. The vacuum channel interface 13 is provided on the end cover, and a sealing component is provided at the channel between the lower end cover and the valve stem 5. An external vacuum system is connected to the gas transmission channel and the downstream of the inner hollow rectangular steel ring, and a high-risk toxic gas sensor analysis is provided. When the valve is in the closed state, the vacuum system will work intermittently. If the concentration exceeds a certain limit, the external vacuum system will be continuously enabled by the control circuit to actively extract the high-risk toxic medium from the downstream of the valve seal ring and perform safety treatment at the rear end.

[0023] In this embodiment, a hollow sealing steel ring 11 is connected to the disc 9. One side of the sealing steel ring 11 is provided with several first through holes 111 communicating with the downstream, and the other side is provided with second through holes 112 communicating with the channel of the disc 9.

[0024] In this embodiment, a pressing plate 7 for pressing and fixing the sealing steel ring 11 on the disc 9 is provided outside the sealing steel ring 11. The pressing plate 7 is connected to the disc 9 through screws 6. After installation, the pressing plate 7 should not block the first through holes on the sealing steel ring 11. It can be adopted that the pressing position of the pressing plate 7 does not reach the first through holes, or through holes corresponding to the positions of the first through holes of the sealing steel ring 11 are provided on the pressing plate 7. In this embodiment, the former is adopted. From Figure 1 and Figure 2 it can be seen that the end of the pressing plate 7 does not cover the first through holes. This kind of design is preferably to design the first through holes as far out as possible, and at the same time, it is necessary to ensure that the first through holes can communicate with the hollow part of the sealing steel ring 11.

[0025] In this embodiment, a sealing gasket 10 is provided between the sealing steel ring 11 and the disc 9. In this embodiment, an O-ring 12 is provided at the connection of the channels between the sealing gasket 10, the disc 9 and the valve stem 5. The hole in the disc 9 is large and the hole in the sealing gasket 10 is small, allowing a certain error range during installation.

[0026] In this embodiment, the sealing assembly includes a transition pipe 2. The transition pipe 2 is a hollow pipe fitting. The two ends of the transition pipe 2 are respectively communicated with the internal channel of the valve stem 5 and the internal channel of the lower end cover. A counterbore part for inserting the transition pipe 2 is provided inside both the valve stem 5 and the lower end cover. One end of the transition pipe 2 is inserted into the valve stem 5 and the other end is inserted into the lower end cover. Sealing rings 3 are provided between the outer wall of the transition pipe 2 and the valve stem 5 and between the outer wall of the transition pipe 2 and the lower end cover. The sum of the depths of the counterbores in the valve stem 5 and the lower end cover is greater than the length of the transition pipe 2 to prevent the transition pipe 2 from lifting the lower end cover, resulting in a gap in the installation of the end cover or the valve stem 5 not being installed in place.

Claims

1. An isolation butterfly valve for high-risk toxic media, comprising a valve body, a valve stem, and a disc, characterized in that: When the disc is in the closed state, several channels communicating with the downstream are provided near the downstream side of the valve. These channels extend to the outside of the valve through the valve stem, and a vacuum channel interface is provided outside, which is connected to a vacuum pumping device.

2. The isolating butterfly valve for high-risk toxic media according to claim 1, wherein: A hollow sealing steel ring is connected to the disc. Several first through holes communicating with the downstream are provided on one side of the sealing steel ring, and a second through hole communicating with the disc channel is provided on the other side.

3. The isolating butterfly valve for high-risk toxic media according to claim 2, wherein: A pressing plate for pressing and fixing the sealing steel ring on the disc is provided outside the sealing steel ring.

4. The isolating butterfly valve for high-risk toxic media according to claim 1, characterized in that: The disc and the valve stem are fixedly matched through a pin shaft.

5. The isolating butterfly valve for high-risk toxic media according to claim 3, characterized in that: A sealing gasket is provided between the sealing steel ring and the disc, and an O-ring is provided at the channel connection between the disc and the valve stem.

6. The isolating butterfly valve for high-risk toxic media according to claim 3, wherein: A lower end cover is provided on the valve body below the valve stem. The vacuum channel interface is provided on the lower end cover, and a sealing component is provided at the channel between the lower end cover and the valve stem.

7. The isolating butterfly valve for high-risk toxic media as claimed in claim 6, wherein: The sealing component includes a transition pipe. The transition pipe is a hollow pipe fitting. The two ends of the transition pipe are respectively communicated with the internal channel of the valve stem and the internal channel of the lower end cover. One end of the transition pipe is inserted into the valve stem, and the other end is inserted into the lower end cover. Sealing rings are provided between the outer wall of the transition pipe and the valve stem and between the outer wall of the transition pipe and the lower end cover.

8. The isolation butterfly valve for high-risk toxic media according to claim 7, characterized in that: A counterbore part for inserting the transition pipe is provided inside both the valve stem and the lower end cover.

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