Ball valve seat ring is the most important material is polytetrafluoroethylene (PTFE). It is almost inert to all chemicals, and has the characteristics of small friction coefficient, stable performance, not easy to aging, wide application temperature and excellent sealing performance. However, the physical properties of polytetrafluoroethylene have a higher coefficient of expansion, the sensitivity to cold flow and poor thermal conductivity, requiring the seat seal design must be centered around these characteristics. Seat sealing plastic materials, including Teflon family and filled Teflon, nylon and other materials. However, when the sealing material is hardened, the reliability of the sealing is impaired, especially at low pressure drops. In addition, synthetic rubbers such as nitrile rubber can also be used as seat seal materials, but the media and temperature range in which they are used are limited. In addition, no lubrication, the use of synthetic rubber easily stuck ball. In order to meet the high temperature, high pressure, strong scouring, long life and other industrial applications, the requirements of the past decade, the metal seal ball valve has been a great development. V-shaped valve used to regulate the flow of rapid development. Especially in industrialized countries, the structure of ball valve is continuously improved. For example, all-welded valve ball valve used in petroleum and natural gas pipelines, lift-and-drop ball valve, high-temperature ball valve V-shaped opening adjusting ball valve for cracking equipment, etc., A whole new level. Ball valve has the following advantages: 1, with the lowest flow resistance. 2, because the work will not get stuck (in the absence of slippery agent), it can be reliably used in corrosive media and low boiling point liquid. 3, in the high pressure and high working temperature range, can achieve complete sealing. 4, can achieve fast opening and closing, opening and closing time of some structures only 0.5 ~ 1s, in order to ensure that the test bed can be used in automation systems. Quick opening and closing the valve, the operation without impact. 5, the spherical closure can be automatically positioned in the border position. 6, double-sided seal and reliable. 7, in the fully open and fully closed, the sealing surface of the ball and the valve seat and medium isolation, so the high speed through the valve medium will not be on the sealing surface erosion. 8, cavity medium pressure once higher than the design pressure of 1.33 times, it can automatically vent to the export pipeline or import pipeline. 9, can be designed to have a fire seal. v 10, with anti-static function. 11, designed as a ball valve - shaped ball, with good flow regulation. 12, compact structure, light weight, it can be considered for low temperature medium system is the most reasonable valve structure. 13, symmetrical body, especially welded body structure, can well withstand the stress from the pipeline. 14, closing pieces can withstand the high pressure when closed. 15, all-welded ball valve can be buried in the ground, so that the valve parts from erosion. The maximum service life of up to 40 years, is the oil and gas pipeline ideal valve.
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