ASTM材料规范书ASTM Material Specifications

ASTM材料规范书ASTM Material Specifications

ASTM材料规范书(2)ASTM Material Specifications (2)

ASTM材料规范书(3)ASTM Material Specifications (3)

ASTM材料规范书(4)ASTM Material Specifications (4)

结构材料Materials of Construction

结构材料：翻转式阀瓣止回阀Materials of Construction: Tilting Disc Check Valve

Y形截止阀Materials of Construction: Y-Globe Valve

结构材料：

结构材料：闸阀Materials of Construction: Gate Valve

结构材料：提升式止回阀Materials of Construction: Lift-Check Valve