What is the sealing principle of the Y-ring?

The Y-ring seal is attached to the sealing pair coupling surface by its open lip, and is in linear contact, which generates a "peak" contact stress under the action of the medium pressure. The higher the pressure, the greater the stress. When the coupling member moves relative to each other at the working speed, a sealing liquid film is formed between the sealing lip and the sliding coupling surface, thereby producing a sealing effect. After the sealing lip wears, it has a certain automatic compensation ability due to the pressure of the medium.