... : ASME, ANSI, API, JIS, JPI, DIN, UNI, BS, AS Product part: BS stainless steel Welding Neck Flange Size1/2" ~ 64 ... Chinese canton fair every year.Germany Dusseldorf fair in 2008.Iran Tehran oil show in 2010.Quality Control:Good quality control system ... , coating, marking, packing, delivery. After Sales Service: Shipment tracking in time. Any problem happening of our products, once confirmation will ...