... Valve Co.,Ltd is always at your service.2-Piece trunnion ball valve Features1, 2 piece construction with full port2, Trunnion mounted ball3, ... proof stem5, low and high pressure sea sealing ( self relieving seat design )6, metal backup eats accomplished fire safe functionality.7 ... ,F316,F316LValve stem : 410S.S.,LF3,F304,F304L,F316,F316L Seat : A105+ENP, LF2+ENP, F304,F316Seat insert : PTFE,NYLON, ...