Original control principle of hydraulic and electric system have been changed in de-sign of equipment to avoid defects such as folding, burning etc produced in upsetting of large air valve preform.
为防止大气门毛坯在热镦粗过程中产生的折叠、过烧等缺陷，在设计设备时改变了原有的液压控制和电气控制原理。
Knowledge of basic electrical, welding, cutting and fitting of pipes, principles of hydraulic and air operated equipment.
基础电气知识，电焊，切割，装配管道，熟悉液压和气动设备的基本原理。
Contains hydraulic and pneumatic equipment including pumps, motors, air compressors, cylinders, meters, gauges, and actuators.
包含液压设备和气动设备，包括泵、电动机、空气压缩机、汽缸、计量表、量具和传动装置。
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