... picturs 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 ... ,MSS SP61,API598,ISO5208Type Of OperationGear,Electric,Pneumatic,Manual-Air-HydraulicDN(NPS)2"~24"PN(LB)Class ... AND JIS . non rising stem flange knife gate valve