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SEALING PERFORMANCE OF BALL VALVE
Created on 2024.08.05
The most important seat sealing ring material of ball valve is polytetrafluoroethylene (PTFE), which is inert to almost all chemicals, and has the comprehensive characteristics of small friction coefficient, stable performance, not easy aging, wide temperature application range and excellent sealing performance. However, the physical properties of PTFE, including a high coefficient of expansion, susceptibility to cold flow, and poor thermal conductivity, require that seat seals be designed around these properties. Plastic materials for seat seals also include filled PTFE, nylon, and many others. However, when the sealing material hardens, the reliability of the seal is compromised, especially at low differential pressures. In addition, synthetic rubbers such as butadiene rubber can also be used as seat sealing materials, but the media it can be used for and the temperature range used are limited. In addition, if the medium is not lubricated, it is easy to get stuck in the ball using synthetic rubber.
In order to meet the requirements of industrial applications such as high temperature, high pressure, strong erosion, and long life, metal sealed ball valves have been greatly developed in the past ten years. Especially in industrially developed countries, such as United States, Italy, Germany, Spain, Netherlands, etc., the structure of ball valves has been continuously improved, and all-welded valve body directly buried ball valves, lifting ball valves, so that ball valves are more and more widely used in industrial fields such as long-distance pipelines and oil refining devices, and large-diameter (3050mm), high pressure (70MPa), and wide temperature range (-196~815°C) ball valves have appeared, so that the technology of ball valves has reached a new level.
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