凹凸: concave-convex面: face法兰: flange凸面法兰: convex flange; male flange; raised face flange; raised-face flange凹凸面: male and female; male and fomale凹凸面对焊钢制管法兰: steel pipe welding neck flanges with male and female face for pn 0mpa; steel pipe welding neck flanges with male and female face for pn 5mpa; steel pipe welding neck flanges with male and female face for pn mpa凹凸面钢制管法兰盖: steel pipe blank flanges with male and female face for pn 0mpa凹凸面整体钢制管法兰: integral steel pipe flanges with male and female face for pn 0mpa; integral steel pipe flanges with male and female face for pn 5mpa; integral steel pipe flanges with male and female face for pn 6mpa; integral steel pipe flanges with male and female face for pn mpa大凹凸面: large male &female face墙的凹凸面: jog双凹凸面: double male & female face凹凸面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges with male and female face凹凸面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with male and female face凹凸面对焊环板式松套钢制管法兰: loose plate steel pipe flanges with welding neck collar with male and female face凹凸面平焊环板式松套钢制管法兰: loose plate steel pipe flanges with weld-on collar with male and female face凹凸面型钢制管法兰用石棉橡胶垫片: asbestos rubber gaskets for steel pipe flanges with male and female face凹面法兰: concave flange; female flange; lower flange槽面法兰: groove flange单面法兰绒: jersey flannel宽面法兰: full face flange平面法兰: face-flange; flat-face flange; plain-straight-face flange; plane normal双面法兰绒: shaker fla el; shaker flannel突面法兰: raised face flange窄面法兰: narrow face flange整面法兰: full faced