应在所有管件处以及第12.2段中规定的一般跨距间隔处为托架、管槽及转角系统提供支撑。
Supports for tray, channel, and Angle systems shall be provided at all fittings and at the normal span intervals specified in paragraph 12.2.
大喉管经改进后构成一段内螺旋管件，有利于提高油的雾化质量。
The improved big throat pipe forms a section of internal spiral pipe component, which is favorable to improve the quality of the oil atomization.
管件止回阀是为直流金属管线设计的三段式结构止回阀。
The Tubing Check Valve is a three-piece construction check valve designed for use with straight metal tube.
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