The reason why the packing can compress the seal is mainly the bearing effect and the labyrinth effect.
The bearing effect of the packing means that between the packing packing and the shaft, a liquid film is formed due to the tension, so that the packing of the packing and the shaft form a sliding sliding bearing, so the packing and the shaft are not Excessive friction and wear.
The labyrinth effect of the packing means that the surface of the shaft cannot be leveled, and the packing and the shaft can only be partially fitted and cannot be completely fitted. There is always a very small gap between the packing and the shaft. These gaps form a labyrinth belt in which the medium is throttled multiple times to achieve a seal.