supply various types of flanges, such as welding neck flanges, palte type flat welding neck flanges, slip-on flanges, socket welding flanges, threaded flanges, blind flanges, butt welding ring loose flange, flat welding ring loose flange, lap joint flanges.according to DIN, ANSI, GB.JIS and so onhave passed ISO 9001 Certificate.competitive price and good quality.