Selection of fluorine-lined ball valve
body and valve trim materials For fluorine-lined ball valves in an environment above 450 °C, the influence of temperature and pressure conditions on the mechanical strength of materials must be considered in the design and selection, such as in boiler feedwater systems and Under the high temperature conditions of the superheat bypass system, conventional fluorine-lined ball valve body and valve trim materials are not suitable (such as O-rings, PTFE materials, elastic materials and standard gaskets, etc.). Therefore, more durable materials must be selected. The maximum temperature that can be used for general materials is about 500°C. For the occasion higher than 538℃, the fluorine-lined ball valve body is usually made of chromium-molybdenum steel. For occasions with a maximum temperature of about 1035°C, SUS310S stainless steel is usually used, and the carbon content of the material must be controlled between 0.04 and 0.08%. For higher temperature, it is recommended to use non-metal heat-resistant material lined (can be used for high temperature occasions up to 1200°C) or special high-temperature-resistant high-strength alloys (such as high-temperature-resistant high-strength alloys for engine combustion chambers, which can be directly used at 1000°C) high temperature). Fluorine lined butterfly valve
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