inner flange meaning in English

内安装凸缘
内法兰盘

Marine combination pipe flanges , slip - on steel outer flanges , braze - on brass inner flanges
船用焊接铜环松套钢法兰
Marine combination pipe flanges , slip - on steel outer flanges , fillet weld - on steel inner flanges
船用搭焊钢松套钢法兰
Marine combination pipe flanges , slip - on steel outer flanges , butt weld - on steel inner flanges
船用对焊钢环松套钢法兰