PTFE rotating seal is a unidirectional function of the rotary lip seal region, with low friction and excellent properties of low energy consumption for poor lubrication, high speed, high temperature and strong corrosion medium harsh environmental conditions, and there are a variety of forms, spring pre tightening type, double lip type, single lip, mouth and lips, with or without dust lip and outer diameter with O ring, support ring, in a certain sense can completely replace the traditional skeleton oil seal, and is superior to skeleton oil seal.