Abstract: ball valve, from the characteristics, with body generally incomparable advantages, from the point of view of technology, all pass valve diameter, high flow, low flow resistance, switching easily, and the technique index gradually from low, normal temperature to high temperature and high pressure,, and gradually replace the valve, the valve globe valve and some functional limitations. In particular, the increase in the number of two - phase flow of gas, liquid and solid, and the promotion of the application of ball valve. In recent 10 years, the high temperature, high pressure, abrasion resistance, and the rapid development of resistance to the ball valve, has a wide range of development potential, in the current stage, has been fully revealed.

The further implementation of the "five eleven" plan, the construction of a number of large projects, the construction of the west east gas project and other projects to promote the rapid development of the valve industry, in particular, to promote the localization process of high-end valve products, which in itself is a new opportunity and challenge for domestic and valve enterprises. Among them, the metal sealing ball valve has been used as a high-end technology products, the influx of hot market areas. After many years of sustained development, China has entered into the accelerated phase of industrialization, and will continue to adjust the industrial structure in the development process to meet the needs of equipment manufacturing equipment to support related products. This paper introduced the basic principle of ball valve, especially the buried fully welded ball valve product advantage, and elaborate burial type ball valve with metal sealing ball valve with good prospects for development.