PFA pipe fittings, PFA or FEP tubes and valves are specially applied in the high-purity semiconductor industry and are also suitable for ultrapure water or corrosive chemicals, Good dimensional stability and corrosion resistance can be maintained between - 40 ° C and 200 ° C, and good mechanical features, anti-wear. There are mainly two kinds of sealing methods for PFA pipe fittings and valves, the extended mouth type joint sealing and the entry bead type joint sealing. The variety of PFA valves is mainly diaphragm valves. PTFE pipe fittings and valves are primarily suitable for use in both corrosive environments and chemical application environments. PTFE pipe fittings and valves primary means of sealing: jacketed joint sealing. The variety of PTFE valves is primarily ball valve.