Weld Neck Flanges 2) Size: DN10-DN600 3) Class: PN0.6Mpa, PN1.0Mpa, PN2.5Mpa, PN4. ... ASME, ANSI, API, DIN, BS, AS, JIS, JPI 6) ISO 9001 certificate, 3.1B certificate provided 7) Delivery: ... We manufacture all kinds of flanges, such as forged SO flange, blind flanges and welded neck flange and ... requirements. If you want to purchase high quality flanges and pipe fittings, please send your enquiry to ...