1.
Steel pipe blank flanges with male and female face for PN 4.0MPa (40 bar)
GB/T9123.19-1988PN4.0MPa(40bar)凹凸面钢制管法兰盖
2.
Steel pipe welding neck flanges with male and female face for PN 10.0MPa (100 bar)
GB/T9115.21-1988PN10.0MPa(100bar)凹凸面对焊钢制管法兰
3.
Steel pipe welding neck flanges with male and female face for PN 15.0MPa (150 bar)
GB/T9115.22-1988PN15.0MPa(150bar)凹凸面对焊钢制管法兰
4.
Steel pipe welding neck flanges with male and female face for PN 2.5MPa (25 bar)
GB/T9115.18-1988PN2.5MPa(25bar)凹凸面对焊钢制管法兰
5.
Steel pipe blank flanges with male and female face for PN 25.0MPa (250 bar)
GB/T9123.23-1988PN25.0MPa(250bar)凹凸面钢制管法兰盖
6.
Steel pipe blank flanges with male and female face for PN 2.5MPa (25 bar)
GB/T9123.18-1988PN2.5MPa(25bar)凹凸面钢制管法兰盖
7.
Steel pipe blank fanges with male and female face for PN 1.6MPa (16 bar)
GB/T9123.17-1988PN1.6MPa(16bar)凹凸面钢制管法兰盖
8.
Steel pipe blank flanges with male and female face for PN 10.0MPa (100 bar)
GB/T9123.21-1988PN10.0MPa(100bar)凹凸面钢制管法兰盖
9.
Steel pipe blank flanges with male and female face for PN 15.0MPa (150 bar)
GB/T9123.22-1988PN15.0MPa(150bar)凹凸面钢制管法兰盖
10.
Steel pipe welding neck flanges with male and female face for PN 4.0MPa (40 bar)
GB/T9115.19-1988PN4.0MPa(40bar)凹凸面对焊钢制管法兰
11.
Steel pipe welding neck flanges with male and female face for PN 5.0MPa (50 bar)
GB/T9115.20-1988PN5.0MPa(50bar)凹凸面对焊钢制管法兰
12.
Steel pipe welding neck flanges with male and female face for PN 25.0MPa (250 bar)
GB/T9115.23-1988PN25.0MPa(250bar)凹凸面对焊钢制管法兰
13.
Steel pipe blank flanges with male and female face for PN 5.0MPa (50 bar)
GB/T9123.20-1988PN5.0MPa(50bar)凹凸面钢制管法兰盖
14.
Integral steel pipe flanges with male and female face for PN 1.6MPa (16 bar)
GB/T9113.9-1988PN1.6MPa(16bar)凹凸面整体钢制管法兰
15.
Integral steel pipe flanges with male and female face for PN 10.0MPa (100 bar)
GB/T9113.13-1988PN10.0MPa(100bar)凹凸面整体钢制管法兰
16.
Convex on one side and concave on the other.
凸凹的一面凸一面凹的
17.
0 - Flat;1 - Raised;2 - Inset;3 - Raised Light;4 - Inset Light
-平面；1-凸起；2-凹入；3-凸起光；4-凹入光
18.
Concave on one side and convex on the other.
一面凹进一面凸起的