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Keywords: valves; design standards; changes In recent years, along with the continuous development of the industrial environment, the scale of industry continues to increase, in order to achieve a better development in the market environment where competition is planned Effectively using advanced machinery and equipment to improve the current work efficiency of enterprises is the main requirement for the rapid development of the modern market economy. In current mechanical equipment, the design of the valve is the key to maintaining a safe and stable operation of the overall mechanical system. Effective design of mechanical equipment valves can be said to be the fundamental content of the realization of the valve's own value.
1 Valve design overview Valves can be said to be a general-purpose type of mechanical products that cannot be lacked in the current industrial and human life processes. Valves in current fluid systems, the main purpose is to go to the direction and pressure of the fluid itself. And the flow device is controlled, and it is also capable of setting the piping and the medium in the device to make it flow (liquid, gas, powder) or to be suspended and can control the flow of its own. The valve can be said to be a control component that cannot be lacked in the pipeline fluid delivery system. Its main purpose is to improve the passage section and the flow direction of the medium. It has its own flow and cutoff, and throttling and There are many functions such as shunting or overflow relief. Valves for fluid control, from the simplest shut-off valves to the most complex automatic control systems, the main types of valves used in their own, and their specifications and specifications can be said to be very large, the valve's nominal diameter is very The tiny instrument valve is large enough to use the road valve of an industrial pipe with a diameter of 10m. The control on the valve can be used in a variety of transmissions, such as manual and electric, as well as hydraulic and pneumatic; it can also be used under pressure and temperature and other forms of sensing signals. The opening or closing of the big bang is done according to the predetermined action requirements, or by making itself independent of the sensing signal. The valve relies on a drive or an automatic machine to cause the opening and closing member to move up and down and complete the slip and the swivel and associated swivel motion, thereby enabling it to perform its own flow path area for its own needs. Control functions are given to the implementation.
2 Valve design related standards and changes In recent years, along with the rapid development of our national economy, the level of cooperation between the international community has continued to improve. The development of industry can be said to be a strong national security, industrialization. The continuous improvement of its own level has also enabled our country's national economy to achieve rapid, stable and very sustained development, which has enabled people's own living standards to be improved rapidly and very stable. At the same time, it can also make the industrial operation level not be able to deviate from the mechanical operation. The valve also plays a major role in the current mechanical operation system. The current design of the valve directly affects the safety performance of the mechanical system. Can make the current industry more effective and rapid development, many of the world's mountain countries have begun to actively work on valve-related design and research, so that it can better promote the sustained and stable development of our country's international economy. . The current design scale of the valve is also beginning to develop in the direction of internationalization. Many countries in the world have studied different types of valves. In the valve market, API 6D and ASME B16.34 can be said to be two very important standards that cannot be ignored in the valve design process.
2.1 ANSI 6D-2008 Performance Analysis All components and test equipment need to be effectively disposed of in accordance with the production equipment, so that it can effectively meet the sustainable development needs of the modern industry. When the mechanical equipment is in operation, the valve itself generates a lot of heat due to the continuous operation. In addition, the friction between the valve itself and the other components is a variety of physical phenomena. This requires ANSI 6D-2008 to design certain drugs to perform the required tests in a standardized and scientific manner, or to go to the inspection materials and other acceptance equipment as required by the manufacturer's instructions for use, periodically. To properly certify and control it, and to complete the relevant calibration and recording work to ensure that it meets the accuracy specified by the prescribed and internationally recognized standards, the current pressure measuring device of the valve and the main pressure measuring device should also be regularly The calibration is completed so that the performance of the valve itself can be met to meet the relevant requirements set forth in the industrial development process. In the ANSI 6D-2008 design and assurance process, the design of the pressure-bearing original needs to take into account the load of the pipeline itself as well as the operating force and the factors generated by many different aspects of the pressure, in accordance with internationally recognized design standards. The choice of specifications, the valve also needs to be marked with the relevant design specifications, in order to be able to clearly understand its own performance in the process of using the valve in the future.
2.2 ASME B16.34-2013 performance analysis In order to make the ASME B16.34 standard suitable for use in API 6D, two auxiliary valve bodies are installed on the valve of the multi-stage valve body structure, and they are respectively placed on both sides of the valve body. When the manufacturer of the valve is unable to perform the relevant regulations such as the SME B16.34 standard, the specific wall thickness of the main valve body is 1.5 times that of the conventional design. The d value of the old standard valve body is mainly known as the diameter of the valve flow path, and the inner diameter of the main valve body is about 1.5 times the diameter of the flow path. This specification design re-divides the material group of the valve, modifies the remarks of the material grade table, and calculates the minimum wall thickness of the valve body through scientific calculation methods, so that the valve plays the maximum role in the actual work. As the basic standard for valve design, ASMEB16.34 eliminates the need for cumbersome calculations in the valve design process, facilitates valve manufacturing and research, and provides guidance and regulation during valve design, research, production, and manufacturing.
2.3 Changes in Design Standards In the mid-20th century, China's valve design was based on the valve manual originally designed by the Soviet Union. During that period, our country's economy, science and technology were relatively backward, and at the same time, because of the lack of technical talents in technical and related fields, the development of the industry became very slow. Therefore, in order to be able to meet the needs of the development of the industry, it is necessary to calculate the strength of the valve itself. In recent years, with the reform and opening up and our country's accession to the WTO in the early 1970s, the American Society of Engineers officially established the ASME B16.34 branch, and will implement the prototype of the valve design standard for effective planning. Initial design standards for US valves were dispersed in specific valve designs. The operation cannot be carried out with reference to a relatively complete design standard. And along with the continuous development of our national economy and the continuous updating of science and technology, the United States has developed a new ASME B16.34 valve design standard [4], the flange end of the valve is connected, the thread segment has a new regulation valve The connection between the joint and the welded end allows the valve design to be continuously improved and standardized. ASME B16.34 redefines the rated pressure of the valve. With the continuous development of the times, the use of valves in the industry is becoming more and more popular. Valves are used to solve many problems in the industry. ASME B16.34 valve standard This design brings great convenience, and at the same time, the calculation of the product is effectively simplified, the wall thickness of the valve body is reasonably given, and the safe operation of the valve itself is guaranteed. It can be said that this is of great benefit to the future promotion of the valve manufacturing industry.
3 Conclusion The wide application of valves in the current industrial field has made continuous changes in the standards of valve design in our country. The standards for valve design in many countries in the world have begun to mature, in order to be able to work with the current industry. To ensure the demand of the valve, in the current era of economic and technological development, the valve manufacturing industry should continue to adhere to the development goals of keeping pace with the times, continue to innovate, and also need to be relevant to our national standards. Information, reasonable to go to the advanced science and technology to design the valve, continue to analyze the problems in some complex structures, so that it can more effectively optimize the structural design of the valve product itself, so that we The overall level of the national valve manufacturing industry has been reasonably improved.
References [1] Miao Yucai. Comparison and Analysis of Valve Pressure Test Standards at Home and Abroad [J]. Valves, 2011, 09 (06): 26-28.
[2] Zhao Yong. Valve quality and standards [J]. Chemical Equipment and Pipeline, 2011, 06 (05): 66-67.
[3] Zheng Yunhai. Analysis of domestic and international standards for steel gate valves [J]. Valves, 2012, 11 (02): 19-21.
(Author: Yancheng Fangding Cryogenic Valve Co., Ltd.)
Abstract: The rapid and rapid development of our country has made our country's industry develop very rapidly. In recent years, with the continuous expansion of our country's industrial scale, the current use of machinery and equipment has become the focus of improving the efficiency of enterprises. content. In the current management of mechanical equipment, the valve plays a very important role. The design of the valve itself has a direct impact on the current operation of the equipment system. This paper analyzes and summarizes the standards and changes related to valve design.