Explore the design of common chemical technology valve tips

Abstract: The chemical industry is a dangerous industry. Many chemical products are corrosive and explosive. Dangers can occur if they are not used carefully. Therefore, to do a good job related to the preparatory work, including the choice of the valve is the key, the valve is the basic design of the chemical industry equipment, but its performance on the role of chemical production is huge. However, there are more types of valves and how to make rational choice is the key. Appropriate valves can increase the efficiency of chemical production, and on the contrary, it will bring danger. The main research of this paper is the selection of common valve in chemical design.
In chemical production, the valve is mainly used in the pipeline, the role of the valve is to control the flow of gas or liquid in the pipeline, and therefore play an important role in chemical production. In recent years, chemical production design because of the valve selection problems such as explosions are common, becoming the focus of attention. With the development of economy, the choice of valve types increases, ensuring the safety of valves in the pipeline is the key factor, but also the key to research.
1 chemical design of the key factors in the selection of the valve 1.1 to determine the use of the valve different types of valves, the use of natural is different. Different valves on the pipeline control and the pressure exerted on the pipeline is different, the valve is mainly used in the pipeline, it must also be based on the nature of gas or liquid pipe to choose. The designer should choose the valve according to the specific use of the valve, can not be used indiscriminately. Many designers before for the convenience of the map, the valve selection process, not in accordance with the provisions of the choice, resulting in the valve does not work, or even dangerous.
1.2 determine the type of valve Because of the different uses, the type of valve is naturally diverse, not only size, shape differences, more importantly, the material differences. Different valves, whether their own performance or production process there is a clear difference, you need to pay attention to the choice.
1.3 to determine the connection port Chemical design, we must pay attention to the selection of the valve connection port applications to ensure that the chemical design of the valve can fully send their own role in dealing with changes at the interface.
1.4 Selection of high-quality valves In the valve selection, nature is the better the quality, the higher the safety. Valve production of different materials, the natural price is different, safety performance and role are not the same. Select high-quality valves not only to ensure the safety of the process, but also reduce the potential safety problems, to ensure that the valve in the use of the process to maximize effectiveness.
2 commonly used valve selection analysis 2.1 Gate Valve Selection Analysis Gate valve is a valve path switch, open the gate valve gas or liquid flow began to flow, closed, the flow of natural stops. Gate valve in a timely manner to block the material flow within the pipeline, more convenient. At the same time the gate valve structure is relatively stable, practical, easy to use, flexible operation, but its production process is more complicated, the natural price is more expensive. Choose the chemical industry should be based on the actual situation of the pipeline and the development of enterprises to make a reasonable choice, do not take this one loss, to bring economic pressure on enterprises or reduce efficiency. Gate valve in the installation process has the advantage that there is no need to consider the installation direction, the pipeline design will not bring bad effects. Gate valve fluid requirements of the pipeline is not too high temperature, there are two main applications of the fluid, one is a relatively high viscosity fluid, one is more fluid impurities.
2.2 Ball Valve Selection Analysis Ball Valve, as its name implies, the spool is a spherical body with through-hole. When starting the ball valve, the ball of the valve core will change its position according to the direction of finger breaking, so as to achieve the purpose of opening or closing. Ball valve operation is relatively simple, the naked eye can easily identify the state of the valve, small size, easy to use. Ball valve structure is relatively simple, the market price is not expensive, is the use of a more. The resistance of the fluid in the pipeline to the ball valve is relatively small, will not have a big impact on it, and the wear on the ball valve surface is relatively small. However, compared with the gate valve, the role is relatively small, can not control the flow of the pipeline, but can promptly cut off the fluid within the pipeline. Ball valve on the temperature requirements should not be too high, the fluid inside the pipe can be gas or liquid.
2.3 Throttle Choice Analysis Throttle valve is also a valve that can well control the fluid flow in the pipeline. Throttle valves are generally not used to cut off fluid, but to change the fluid flow. Throttle valve structure and the ball valve and gate valve are different, its valve is throttling components, valve size and shape of the different control of the flow rate is also different. The advantage of the throttle valve is that it can regulate the flow in the pipeline well, save resources and energy and reduce the cost. However, in the process of using, the valve core is easily corroded and therefore needs to be replaced frequently or else it will lose its effectiveness. No precise adjustment is possible. Throttle valve on the pipeline fluid is also low temperature, but it is high pressure. Throttle valve to have enough space, it can work well, this is the key when choosing. Spool of different shapes and sizes, the role is not the same, the choice should be based on the actual use of a reasonable choice.
2.4 the safety valve of the relief valve is a selected analysis device to protect the security of the entire pipeline, in case of danger, timely initiation of the safety valve can be blocked dangerous. The working principle of the safety valve is to control the fluid pressure based on its own valve body design to maintain it below the safety value to ensure the normal fluid flow in the pipe. Once the fluid flow in the pipe or air pressure exceeds the normal value, the safety valve will start, and start the safety valve, the pipe fluid and air pressure will return to normal. The use of safety valve is not many, only in special circumstances will start. The use of safety valves is more extensive, basically will be used, so the type is very much.
3 Conclusion The choice of valve on chemical production has an important role in the choice of the process, according to the specific use, the characteristics of the fluid within the pipe, the environment and other factors to make a reasonable choice. Valve is the main application of the pipeline, in chemical production, the pipeline fluid with flammable and explosive features, therefore, the valve selection is critical. In chemical design, the choice of valve is also very strict, requiring staff attention.
references:
Yang Kaiqi. Research on Selection of Special Valves in Chemical Engineering Design [J]. Chemical Industry Management, 2016, (18): 191
[2] He Ping. On the chemical design of the commonly used valve selection strategy [J]. Science and Technology Wind, 2012, (22): 03.
[3] Mao Hui.Chemical design of the commonly used valve selection method [J]. Petrochemical Technology, 2015,22 (6): 59.

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