... 3.Cert:ISO9001:2008,TUV2010,PED2010 DIN12253 SO1. Type: WN, SO, SW, LJ, BL, TH, PL,LWN, Orifice Flanges and Non ... categories,deep punching type,step shaft,ring class,gear and so on).Production Process: 1.Material 2.Material Sectioning 3. Heating ...