1. Bushing F4F46, according to the use of temperature and working medium using different materials filler, good lubrication, long life.

2. The inlet and outlet window of the valve body of the fluorine-lined plug valve is designed as a double-groove sealing ring structure, and the sealing specific pressure between the sealing pairs gradually changes during the rotation of the plug until it reaches the fully open or fully closed position, which produces sufficient sealing specific pressure and zero leakage of the sealing pairs.

3. The double-groove sealing ring can make the PTFE bushing stable in the valve body without displacement, and can absorb the trace deformation of the bushing caused by the temperature difference, and at the same time, there is a strong wiping effect between the bushing and the, and the service life of the sealing surface is improved.

4. The whole sealing process of the fluorine-lined plug valve can be approximately considered to have nothing to do with the pressure in the pipeline.