1. GB4622.2-93 Wound gasket pipe flange size series

2, GB9126.1-88 asbestos rubber sheet for flat steel pipe flange

3, GB9126.2-88 asbestos steel pipe flange with asbestos rubber sheet

4, GB9126.3-88 Asbestos rubber sheet for concave and convex steel pipe flange

5, GB9129-88 steel pipe flange with asbestos rubber gasket technical conditions

6, GB9130-88 steel pipe flange connection metal ring pad technical conditions

7. HGJ70-91 flexible graphite composite gasket for steel pipe flange

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