характеристики герметизации клапана в низкотемпературных условиях

герметичностьindustrial valve

Types of Valve Sealing Performance

To address this issue, low-temperature valve designs typically avoid using traditional non-metallic sealing materials, especially in environments where temperatures fall below -70°C. Non-metallic materials can be combined with metals through special processes to form composite structures to improve low-temperature sealing performance. However, some non-metallic materials still perform well at low temperatures. For example, polyethylene developed by Irish Alloy Ltd. retains excellent toughness at -269°C, and Mylar plastic developed in France remains elastic at liquid hydrogen temperatures (-253°C), while certain polycarbonate materials perform well at the temperature of liquid nitrogen (-196°C).

Low temperatures affect not only the materials but also the structural design of the valve. For example, when designing gate valves, ball valves, and butterfly valves, elastic sealing structures can be incorporated to compensate for sealing surface deformation caused by low temperatures. For globe valves, conical sealing structures can be used to reduce the impact of low-temperature deformation on the sealing surface, thus improving sealing performance.