Advantages:

The use of PTFE seals enables diaphragm valves to have high chemical resistance and high heat resistance. Another advantage of the PTFE seal is its non-adhesive property (anti-stick property), and the surface of the PTFE seal is easily washed down.

Precaution:

Because PTFE is very sensitive to foreign particles such as dust, the installation of filters is required in order to prevent foreign particles from entering into the system.

List of Diaphragm Isolation Valves can be viewed from here.