• The Current Situation of the Valve

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The Current Situation of the Valve

  • Mar 18, 2022
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A valve is an important fluid control device in the industry, involving all walks of life, especially petroleum and petrochemical, liquid transportation and other industries. The emergence of CAD parameterization technology and CAE technology has played a great role in promoting the design and research of valves.
 
Characteristics and types of valves 
Valves are widely used. In a complete set of large mechanical equipment, the investment in valves accounts for 2% to 6%. There are many types of valves and they have great functions. The performance and quality of valves have an important impact on the normal operation of the entire conveying device or working condition system. Valves can be roughly divided into 3 categories according to their functions and uses, as shown in Table 1.
 
Table 1 Types, functions and uses of valves
Types Functions and fuctions Examples
Cutt off valves The function of the check valve is to prevent the conveyed fluid from flowing back into the reactor or storage container and back suction caused by the stop or reverse of the pumps. The function of the safety valve is that when the equipment or pipeline reaches or even exceeds the required pressure value, it needs to be used to release the pressure in time for safety protection. The function of the regulating valve is to regulate the speed and pressure of the fluid in the device. Gate valves, cutt-off valves, needle valves, etc.
Vacuum valves They are mainly used to control the flow direction of the gas in the device system, and connect, cutt off and control the flow rate. Vacuum ball valves, vacuum flapper valves, vacuum, inflation valves, etc.
Valves used for special purposes Valves with specific uses play a specific role in specific occasions to improve efficiency and safety. For example, nuclear power valves need to adapt to different working conditions before they can be used to ensure nuclear safety. Drain valves, exhaust valves, pigging valves, discharge valves and filters.
 
The status and development trend of foreign valves
Before 1950, many foreign countries had established valve design units and production industries. In addition, some associations and academic organizations are formed to carry out technology exchanges, design and research analysis of valves, such as the former Soviet Union's research institute, the valve industry alliance established by the United States and the United Kingdom, and the valve industry association of Japan.
 
These organizations and technical development departments mainly complete the technical innovation, research and development of valves through two modes. One is the centralized mode. The Central Research Institute completes the compilation of specifications, the standardized design and production of valves, and the testing of new products and new processes. The other mode is to carry out research and analysis for the new products and markets of the company, starting from the actual production and demand based on the purpose of improving performance, safety, service life, high parameters, and harsh working conditions. In addition, the research department also has a testing center, which can test the performance of new products at any time, and propose improvement plans for materials and manufacturing processes; these have promoted the development of the valve industry.
 
The status and development trend of domestic valves
In recent years, China has established a relatively complete production and operation system in the field of valves, and analysis methods such as finite element have improved the design capabilities of valves. However, there are still manufacturing problems and domestic production has not been achieved for dedicated valves such as valves with large diameters and nuclear power valves.
 
At present, there is a certain gap between the industrial structure and product structure of domestic valves compared with developed countries. In order to improve the overall production efficiency and technical level of the valve industry, we must pay attention to the research and development of new technologies, design of diversity, and research of basic theory, increasing capital investment, introducing advanced computing technology, improving testing and inspection standards of valves and researching on valves with high parameters and high performance.
 
  • Starting from the research on the basic theory of valves, sum up experience and analysis results, and carry out theoretical innovation and theoretical verification.
  • Integrate domestic valve industry resources; specialized funds are used for dedicated purposes. Increase investment in talent funds, and avoid unnecessary waste of funds.
  • Pay close attention to and study the application of foreign advanced technology and high-tech in valve structure design and strength calculation; introduce advanced structure calculation software and manufacturing equipment, and speed up localized production.
  • Pay close attention to dedicated valves with high parameters and high performance.
  • Improve testing and inspection standards for valves. Conduct data statistics and report analysis on valves under different system operating conditions; evaluate and improve materials and processes, and improve performance and quality.