swivel flange 1)size:1/2" - 48" 2)service:OEM 3)certificate:ISO9001:2000,QS-2000 4)standard:DIN,ASME,API .specificationsForged Steel Flanges:(1).ASME/ANSI B16.5 : WELDING NECK FLANGE, SLIP-ON FLANGE, BLIND FLANGE,HIGH HUB BLIND FLANGE, SOCKET WELD FLANGE.LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE.Pressure Class : 150, 300, 400 , 600 , 900, 1500 , 2500(2).ASME/ANSI B16.47(SERIES A & ...