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[Key words] chemical pipeline design; common valve; characteristics; selection CLC number: J51-4 Document code: A Article ID:1009-914X(2019)04-0327-01
The types of valves used in the specific chemical pipeline design work are various, so it is more difficult to select the valve. In this context, the corresponding personnel should pay attention to the valve selection. Starting from the valve structure, principle, performance and other aspects, we have made a careful choice after having a certain understanding of its characteristics [1].
I. Analysis of the gate valve At present, the gate valve is a very common type of valve in the design of chemical pipelines in China. This type of valve is generally selected when carrying out specific work. By analyzing the relevant research results, we can find that the use of gate valves in the work process is usually less affected by pressure and temperature, and the direction in which the liquid tends to flow when flowing through the valve does not change greatly. At the same time, its resistance to the medium is also very small [2]. At the same time, the valve still has a series of shortcomings. For example, when the gate valve is used, it takes a long time to open it and close it, and the liquid flowing through it is easy to cause on its surface. Erosion, which imposes certain restrictions on its application.
2. Analysis of the shut-off valve The cut-off valve is also a type of valve that is commonly used in the development of specific chemical pipeline design. Currently, the valve is mainly applied to the outlet position of the pump or the regulating valve in this field. Upstream location. The interior of the shut-off valve can continue to be divided into straight-through shut-off valves, angle-type shut-off valves, and Y-type shut-off valves. These valves are common in shut-off valves [3]. The appearance of the shut-off valve improves the shortcomings of the gate valve to a certain extent, is more wear-resistant than the gate valve, and it is also easier to maintain and handle the relevant personnel, but it is necessary to pay attention to make the valve also have limitations during use. It must be intelligently unidirectional to flow through the ring when it is working, and it is difficult to maintain a sealed state for a long time to work.
Third, the check valve for the check valve is also known as the check valve, as the name suggests, when the medium is flowing in it, it is only allowed to flow in one direction, this feature can be It plays an important role in preventing the reverse flow of the medium, and on this basis, the purpose of preventing chemical pipeline damage can be achieved well. At the same time, its unidirectional characteristics will also impose greater restrictions on its application, making it only an auxiliary valve device to prevent reverse flow of the medium, and can not achieve a wider range of applications. The more common check valves mainly include three types: swing type check valve, lift type check valve and ball type check valve, among which the swing type check valve is a commonly used one.
IV. Analysis of Butterfly Valves Butterfly valves are often used in the design of chemical pipelines. Its remarkable features are small size and light weight, and its structure is also very simple. These features bring the application process. A significant convenience condition. In the actual application process, workers often use it more in some work with higher traffic. In the actual work process, he also shows certain superiority, and correspondingly has been widely used. But at the same time, we can also find that in the process of using the butterfly valve, the temperature is often not too high, because it is sensitive to temperature, once the temperature is high, it will affect its normal working process. It makes the sealing property worse.
V. Analysis of the plug valve In the chemical pipeline design work, the plug valve is also used. Compared with other types, the valve is relatively expensive to manufacture, and at the same time, it has many advantages. of. First of all, the plug valve is very tight during operation; secondly, it is very convenient to open the valve when it is opened; again, the valve has a very long service life. Finally, the valve can be used during use. Good two-way closure, its superior characteristics make it a wide range of applications, can also achieve a better sealing work name when transporting some highly polluting materials has a strong value and function However, the cost of its cost has affected its wider spread and use to some extent [4].
6. Analysis of the ball valve The ball valve is a valve type that is very similar to the plug valve. According to the structure of the valve body, the ball valve can be divided into a one-piece ball valve, a two-piece ball valve and a three-piece ball valve. Type [5]. The ball valve inherits the advantages of the plug valve to a certain extent, and can better transport some materials with low temperature, strong pressure and strong viscosity, but his cost is much lower than the plug valve, and it is repaired. It is also more convenient for other valves, so it is more widely used. It is worth noting that if some work is required for flow control, the use of a ball valve is not very convenient, because it does not regulate and control the flow.
VII. Summary and Thinking By analyzing the types of valves commonly used in the above six chemical pipeline design work, it is possible to have an in-depth understanding of their respective characteristics, and in this process, we can also obtain corresponding thinking. Therefore, in the future, when selecting the valve in the specific work, it should be more based on the understanding of the valve's working characteristics. When carrying out some work involving the transmission of steam and high temperature oil and gas media, the wedge type single gate valve should be selected more. When carrying out some relatively pure media transportation work, the check valve can be selected. In addition, when using the butterfly valve, it must be noted that the temperature should not be too high, and the pressure of the fluid should not be too high; when using the ball valve, it should be used more for transporting some low temperature, strong pressure, and for the pipeline. Some fluids with higher sealing requirements.
In summary, the selection of commonly used valves in chemical pipeline design work is very important. He has an important impact on the quality and safety of the entire work. For this reason, in the future valve selection process, the corresponding personnel must have their characteristics. In-depth understanding, on this basis for the needs of chemical design work to make specific choices. In this paper, the author analyzes the characteristics of valve types commonly used in chemical pipeline design, such as gate valve, globe valve, check valve, butterfly valve, plug valve, ball valve and diaphragm valve, and then discusses the choice of these valves. . It is hoped that in the future development process, when the corresponding personnel choose the valve, they can consider various factors and create favorable conditions for improving the safety and efficiency of the chemical production work.
references:
[1]Sun Lei. Characteristics and selection of commonly used valves in chemical pipeline design[J]. Energy Technology and Management, 2017, 42(05): 168-170.
[2]Wang Tietie. Selection Skills of Common Valves in Chemical Design[J].Chemical Design Communications, 2017, 43(05): 110+153.
[3] Lao Zhonglin. Selection strategy of commonly used valves in chemical design [J]. Chemical Engineering Design Communication, 2016, 42 (03): 87+116.
[4] Song Yuliang, Ren Huan, Zhang Desheng. Characteristics and uses of commonly used valves for chemical design [J]. China Market, 2015 (33): 55-56.
[5]Cheng Yu,Liu Min.Selection method of commonly used valves in chemical design[J].Guangdong Chemical Industry,2009,36(08):244-245+263.
Thoughts on the characteristics and choices of commonly used valves in chemical pipeline design
[Abstract] With the progress of the times, it has achieved rapid development for many fields in China, and at the same time promoted the development of the corresponding fields to a certain extent. Under the background of this era, the development of China's chemical industry is Some progress has been made. In recent years, with the continuous advancement of science and technology, it has provided many choices for the application of chemical pipeline design working valves in the chemical industry. As we all know, chemical products generally have the characteristics of strong corrosive, flammable, and explosive, which puts higher requirements on the selection of valves. The selection of valves is very important in the design of chemical pipelines. It determines the quality of pipeline design work to a certain extent. Therefore, it is necessary to have an in-depth understanding of the characteristics of common valves when making specific choices. Carefully selected, this article aims to analyze the characteristics and choices of commonly used valves in chemical pipeline design, and then draw their own thinking.