... ,API strictlywe can produce many kinds offloating ball valve such as 3 piece floating balll valve2 piece ... below designed before are served as reference. knife gate valve type features:1, seal by structural ceramics, can ... solid grain scour to seal face, wear, ensure valve seallasting effective.2, single seat design can effectively prevent ... ,ANSI,DIN BS,AND JIS . non rising stem flange knife gate valve