... Disc: (DI, CI, SS) PTFE Coated Stem: SS Seat: PTFE Our PTFE lined butterfly valve adopting the PTFE butterfly boardto sealed spherical surface, being ... adopts divided style,the sealing between the ends of valve shafts can be reached byfluorine-rubber on the rotry ... base between the butterfly boardand valve seat, therefore, the impact and beautiful outlook,reasonable ...