blind flange class 150/600/900 1.Size:4'' * 150lbs 2.Material: A105 3.Standard:ANSI ... , 1500Lbs, 2500Lbs,Etc /PN6,PN10,PN16,PN20,PN25,PN40/ Class A, B, C, D, EstandardASME B16.5, ASME B16.47, ASME ... equipments from AQSIQ , passed the Authentication of API and became a member of first – grade supply network of State Power Corporation ...