751 gb/t 9121.5-1988 pn 1.6mpa(16 bar) 凹凸面平焊环松套板式钢制管法兰 loose plate steel pipe flanges with weld-on collar with male and female face for pn 1.6mpa (16 bar)

　　752 gb/t 9121.6-1988 pn 2.5mpa(25 bar) 凹凸面平焊环松套板式钢制管法兰 loose plate steel pipe flanges with weld-on collar with male and female face for pn 2.5mpa (25 bar)

　　753 gb/t 9122.1-1988 pn 0.6mpa(6 bar)板式翻边松套钢制管法兰 loose plate steel pipe flanges with lapped pipe end for pn 0.6mpa (6 bar)

　　754 gb/t 9122.2-1988 pn 1.0mpa(10 bar) 板式翻边松套钢制管法兰 loose plate steel pipe flanges with lapped pipe end for pn 1.0mpa (10 bar)

　　755 gb/t 9123.1-1988 pn 0.25mpa(2.5 bar) 平面钢制管法兰盖 steel pipe blank flanges with flat face for pn 0.25mpa (2.5 bar)

　　756 gb/t 9123.2-1988 pn 0.6mpa(6 bar)平面钢制管法兰盖 steel pipe blank flanges with flat face for pn 0.6mpa (6 bar)

　　757 gb/t 9123.3-1988 pn 1.0mpa(10 bar) 平面钢制管法兰盖 steel pipe blank flanges with flat face for pn 1.0mpa (10 bar)

　　758 gb/t 9123.4-1988 pn 1.6mpa(16 bar) 平面钢制管法兰盖 steel pipe blank flanges with flat face for pn 1.6mpa (16 bar)

　　759 gb/t 9123.5-1988 pn 2.0mpa(20 bar) 平面钢制管法兰盖 steel pipe blank flanges with flat face for pn 2.0mpa (20 bar)

760 gb/t 9123.6-1988 pn 0.25mpa(2.5 bar) 凸面钢制管法兰盖 steel pipe blank flanges with raised face for pn 0.25mpa (25 bar)

　　761 gb/t 9123.7-1988 pn 0.6mpa(6 bar)凸面钢制管法兰盖 steel pipe blank flanges with raised face for pn 0.6mpa (6 bar)

　　762 gb/t 9123.8-1988 pn 1.0mpa(10 bar) 凸面钢制管法兰盖 steel pipe blank flanges with raised face for pn 1.0mpa (10 bar)

　　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)

　　776 gb/t 9123.22-1988 pn 15.0mpa(150 bar) 凹凸面钢制管法兰盖 steel pipe blank flanges with male and female face for pn 15.0mpa (150 bar)

　　777 gb/t 9123.23-1988 pn 25.0mpa(250 bar) 凹凸面钢制管法兰盖 steel pipe blank flanges with male and female face for pn 25.0mpa (250 bar)

　　778 gb/t 9123.24-1988 pn 1.6mpa(16 bar) 榫槽面钢制管法兰盖 steel pipe blank flanges with tongue and groove face for pn 1.6mpa (16 bar)

　　779 gb/t 9123.25-1988 pn 2.5mpa(25 bar) 榫槽面钢制管法兰盖 steel pipe blank flanges with tonges and groove face for pn 2.5mpa (25 bar)

　　780 gb/t 9123.26-1988 pn 4.0mpa(40 bar) 榫槽面钢制管法兰盖 steel pipe blank flanges with tongue and groove face for pn 4.0mpa (40 bar)

781 gb/t 9123.27-1988 pn 5.0mpa(50 bar) 榫槽面钢制管法兰盖 steel pipe blank flanges with tongue and groove face for pn 5.0mpa (50 bar)

　　782 gb/t 9123.28-1988 pn 10.0mpa(100 bar) 榫槽面钢制管法兰盖 steel pipe blank flanges with tongue and groove face for pn 10.0mpa (100 bar)

　　783 gb/t 9123.29-1988 pn 15.0mpa(150 bar) 榫槽面钢制管法兰盖 steel pipe blank flanges with tongue and groove face for pn 15.0mpa (150 bar)

　　784 gb/t 9123.30-1988 pn 25.0mpa(250 bar) 榫槽面钢制管法兰盖 steel pipe blank flanges with tongue and groove face for pn 25.0mpa (250 bar)

　　785 gb/t 9123.31-1988 pn 2.0mpa(20 bar) 环连接面钢制管法兰盖 steel pipe blank flanges with ring-joint face for pn 2.0mpa (20 bar)

　　786 gb/t 9123.32-1988 pn 5.0mpa(50 bar) 环连接面钢制管法兰盖 steel pipe blank flanges with ring-joint face for pn 5.0mpa (50 bar)

　　787 gb/t 9123.33-1988 pn 10.0mpa(100 bar) 环连接面钢制管法兰盖 steel pipe blank flanges with ring-joint face for pn 10.0mpa (100 bar)

　　788 gb/t 9123.34-1988 pn 15.0mpa(150 bar) 环连接面钢制管法兰盖 steel pipe blank flanges with ring-joint face for pn 15.0mpa (150 bar)

　　789 gb/t 9123.35-1988 pn 25.0mpa(250 bar) 环连接面钢制管法兰盖 steel pipe blank flanges with ring-joint face for pn 25.0mpa (250 bar)

　　790 gb/t 9123.36-1988 pn 42.0mpa(420 bar) 环连接面钢制管法兰盖 steel pipe blank flanges with ring-joint face for pn 42.0mpa (420 bar)

791 gb/t 9124-1988 钢制管法兰对焊端部 butt-welding ends for steel pipe flanges

　　792 gb/t 9125-1988 钢制管法兰技术条件 specification for steel pipe flanges

　　793 gb/t 9126.1-1988 平面型钢制管法兰用石棉橡胶垫片 asbestos rubber gaskets for steel pipe flanges with full face

　　794 gb/t 9126.2-1988 凸面型钢制管法兰用石棉橡胶垫片 asbestos rubber gaskets for steel pipe flanges with raised face

　　795 gb/t 9126.3-1988 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

　　796 gb/t 9126.4-1988 榫槽面型钢制管法兰用石棉橡胶垫片 asbestos rubber gaskets for steel pipe flanges with tongue and groove face

　　797 gb/t 9128.1-1988 钢制管法兰连接用八角形金属环垫 octagonal metallic ring gaskets for steel pipe flanges joints

　　798 gb/t 9128.2-1988 钢制管法兰连接用椭圆形金属环垫 oval metallic ring gaskets for steel pipe flange joints

　　799 gb/t 9129-1988 钢制管法兰用石棉橡胶垫片技术条件 specification for asbestos rubber gaskets for steel pipe flanges

　　800 gb/t 9130-1988 钢制管法兰连接用金属环垫技术条件 specification for metallic ring gaskets for steel pipe flange joints