manhole with butt welded flange 对焊法兰人孔
handhole with butt welded flange 对焊法兰手孔
flange butt joint 卷边对接接头
butt weld flange 对焊法兰
handhold with butt welded flange 对焊法兰手孔
butt-weld flange 焊法兰
butt welding flange 对焊法兰
BWF butt weld flange 对焊法兰
When installing the pipeline with flange, the gasket must be placed between the two butt flanges.
安装带法兰的管路时，必须在两个对接法兰的密封间放置垫片。
The present invention is the production process of steel flange blank, especially of flat flange, butt welded flange and prestressed pipe pile end plate flange.
一种钢法兰毛坯加工工艺，尤其是一种平法兰、对焊法兰、预应力管桩端板法兰毛坯加工工艺。
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