... long stable operation of this series of ball valve. It has the merits of sealing reliability, long life cycle usage and easy operations ... , CF3M, CF8C,Ball:A105,13CR,2CR13,F304.F316,STEM: 13CR,2CR13,F304.F316,SEAT: A105 +STL,.F316 ,F304,Sealing face:Hard face and ... seal :PTFE, PEEK, nylon, RPTFE big sizes flanged cast steel ball valve