Application and Design of Spring-Energized Plastic Seals

Abstract The metallic spring-energized PTFE seal is about 35 years old and in it’s current stage of development can solve difficult sealing problems not possible with any other type of seal. This paper covers the history and development of the spring-energized PTFE seal and how the seal works. The effect of high and low temperatures and back pressure are covered for several different types of springs. The "low friction" characteristics of PTFE spring-energized PTFE seals are discussed. The spring-energized PTFE seal has very unique characteristics that make it suitable for many critical applications from blood handling equipment and other pharmaceutical application, including the liquid chromatography industry, the gas turbine engine and other aerospace hydraulic and cryogenic applications. Some of the unique applications are discussed.