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Analysis of domestic wedge gate valve standard profile
Domestic wedge gate valve standard profile In a variety of pipelines and equipment, fluid delivery system, the valve is one of the most widely used valve varieties. The main features of the gate valve are: (1) flow resistance is small; (2) the torque required by the switch is small; (3) the direction of the flow of the medium is not limited; (4) ) Simple and compact body structure; (6) good manufacturing process. Currently widely used in petroleum, chemical, metallurgy, power plants, medicine, food and other industrial installations. With the increasing international economic and technological exchanges, the valve is an important industrial accessory pipeline accessories in the international market is also rapidly increasing circulation, the national standards for the valve is different, the results of the valve length and flange standards Not the same, which caused great inconvenience to the circulation of international valves. At present, the world's advanced countries in the world for the valve design, manufacture, testing have developed their own national standards, the valve standard used in the main metric units are metric and British two systems. China GB, Germany DIN, France NF, the Soviet Union and other countries have adopted the standard valve standards; the United States ANSI, API standards in the past have been used in English, and now also added a metric schedule. Select the national standard gate pressure - temperature rating benchmark is not uniform. Metric countries, usually the maximum working pressure at room temperature is defined as the nominal pressure, such as GB standard: Carbon steel WCB valve nominal pressure PN10MPa that the maximum working pressure at room temperature, when the temperature rises to 425 ℃ when its maximum work The pressure is only 5.3MPa; while the United States and other countries using the British system, according to different materials at a specified temperature of the working pressure nominal pressure. For example, a 150 lb. carbon steel gate valve of the National Standard ANSIA216WCB material has a permissible working pressure of 150 psi (lbf / in2) at a service temperature of about 560 ° F. When the maximum service temperature of a valve is 800 ° F The corresponding allowable working pressure is 80 psi (lbf / in2). Valve Metering pressure benchmark and other technical parameters of the valve is not uniform, a serious impediment to the exchange and use of valve products, the issue of international standardization is highlighted. On valve international standardization, in September 1971 held its twenty-fifth council meeting in Geneva, decided to set up a common valve industrial valve Technical Committee TC153 "valve", the secretary country is the British Standards Institution. Since the founding of TC153, its activities have been frequent and many meetings have been held each year to discuss and formulate relevant international standards. ISO / TC153 has carried out a great deal of international standardization work on the basic dimensions of general valves, pressure, temperature grade, material test and name terminology , It formulates the valve basic standard, generally applies to the valve industry in the developed country and the developing country, some standards such as ISO: The general industrial valve mark; The general industrial valve term; The metal valve structure length; The valve bonnet bolt Connected steel gate valve; valve material, inspection and pressure test and more. At present, most of these international standards have been adopted by countries to varying degrees, most of them are adopted (equivalently adopted) and some are equally adopted and unequal (refer to). ISO International Organization for Standardization in the coordination of valve standards in various countries have done a lot of efforts, ISO international standards that take into account the existing industrialized countries in the valve industry, but also to absorb advanced technology standards in developed countries, try to harmonize, ISO standards are widely used in all countries in the world. The adoption of international standards is an important technical policy in our country. With the standardization of our country's valves, the valve standards have been developed rapidly. By actively participating in the international activities of the valve industry, our country can keep abreast of developments in the international standardization and revision of the valves and tracking of international standards Situation, formulate and amend the standards of our country in real time and keep up with the international situation. At the same time, foreign counterparts to understand China's valves, valve enterprises in China to more quickly enter the international market to create the conditions. By comparing the main standards of foreign steel gate valves and our national standards, we try to find out the differences between domestic and foreign standards in several aspects such as the shell part, the sealing part, the stem part of the gate valve, and the test and test. Valve design and manufacture for reference.