763 GB/T 9123.9-1988 PN 1.6MPa(16 bar) 凸面钢制管法兰盖 Steel pipe blank flanges with raised face for PN 1.6MPa (16 bar)
764 GB/T 9123.10-1988 PN 2.5MPa(25 bar) 凸面钢制管法兰盖 Steel pipe blank flanges with raised face for PN 2.5MPa (25 bar)
765 GB/T 9123.11-1988 PN 4.0MPa(40 bar) 凸面钢制管法兰盖 Steel pipe blank flanges with raised face for PN 4.0MPa (40 bar)
766 GB/T 9123.12-1988 PN 2.0MPa(20 bar) 凸面钢制管法兰盖 Steel pipe blank flanges with raised face PN 2.0MPa (20 bar)767 GB/T 9123.13-1988 PN 5.0MPa(50 bar) 凸面钢制管法兰盖 Steel pipe blank flanges with raised face for PN 5.0MPa (50 bar)
768 GB/T 9123.14-1988 PN 10.0MPa(100 bar) 凸面钢制管法兰盖 Steel pipe blank flanges with raised face for PN 10.0MPa (100 bar)
769 GB/T 9123.15-1988 PN 15.0MPa(150 bar) 凸面钢制管法兰盖 Steel pipe blank flanges raised face for PN 15.0MPa (150 bar)
770 GB/T 9123.16-1988 PN 25.0MPa(250 bar) 凸面钢制管法兰盖 Steel pipe blank flanges with raised face for PN 25.0MPa (250 bar)
771 GB/T 9123.17-1988 PN 1.6MPa(16 bar) 凹凸面钢制管法兰盖 Steel pipe blank fanges with male and female face for PN 1.6MPa (16 bar)
772 GB/T 9123.18-1988 PN 2.5MPa(25 bar) 凹凸面钢制管法兰盖 Steel pipe blank flanges with male and female face for PN 2.5MPa (25 bar)
773 GB/T 9123.19-1988 PN 4.0MPa(40 bar) 凹凸面钢制管法兰盖 Steel pipe blank flanges with male and female face for PN 4.0MPa (40 bar)
774 GB/T 9123.20-1988 PN 5.0MPa(50 bar) 凹凸面钢制管法兰盖 Steel pipe blank flanges with male and female face for PN 5.0MPa (50 bar)
775 GB/T 9123.21-1988 PN 10.0MPa(100 bar) 凹凸面钢制管法兰盖 Steel pipe blank flanges with male and female face for PN 10.0MPa (100 bar)