The PTFE-filled seal ring determines the service performance and life of the mechanical seal to a large extent. Therefore, some requirements are put forward for it.

⑴Have sufficient strength and rigidity. It is not damaged under working conditions (such as pressure, temperature and sliding speed, etc.), and the deformation should be as small as possible, and the tightness can still be maintained when the working conditions fluctuate.

⑵The sealing end face should have sufficient strength and corrosion resistance to ensure a satisfactory service life under working conditions.

⑶ PTFE-filled sealing ring has good thermal shock resistance. For this reason, the material is required to have a higher thermal conductivity and a smaller linear expansion coefficient, so that it will not crack when subjected to thermal shock.

⑷Tetrafluoro-filled sealing ring should have a small friction coefficient and good self-lubricity, and the sealing ring material should have good wettability with the bee fluid. If a short period of dry friction occurs during work, the sealing end face will not be damaged.

⑸The PTFE-filled sealing ring should be simple and symmetrical, and the integral structure should be given priority. Combined (such as inlaid) seal ring can also be used, and avoid spraying the seal end surface as much as possible.

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