Slip on plate flanges manufacturer from China plate flanges flat flanges exporter Hyupshin Flanges Co., Ltd, flanges pressure PN6 PN10 PN16 PN25 PN40 class 150 300 600 900 1500 2500, slip on raised face and flat face flanges, slip on plate flanges is the same meaning of plate flanges, not boss or hubbed, slip on plate flange norm DIN EN1091-1 BS4504 JIS GOST12820-80 and SANS1123