The structure and principle of jty-1 type air reduction pressure valve for double wind pipe of installation in the raising speed locomotive are described.
介绍了安装在提速机车上专门用于列车双管供风的jty—1型空气减压阀的结构和原理，并介绍了使用、检修及常见故障的处理方法。
The invention relates to a double helical ribbon pipe type reactor, which is particularly suitable for preparing high-performance polyacrylonitrile-based carbon fiber spinning solution.
本发明涉及一种双螺带管式反应器，尤其适用于高性能聚丙烯腈基碳纤维纺丝液制备。
The double radius hole type was commonly adopted for the forming machine of straight weld pipe with vertical roller in domestic present.
目前，国内带有立辊组的直缝焊管成型机大都采用双半径孔型。
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