传统的比例阀和伺服阀都以电的模拟量来控制压力、流量和方向。如果使用电脑,必需要D/A转换器作间接控制,因而在使用上便复杂化了。它们的抗干扰能力差,而且重复误差及滞环误差都大,难以实现高精度的开环控制。直接式数字阀可直接接收微电脑的处理信息,既灵活又可靠。所以它正在不断取代模拟控制阀,广泛用于各种机床、机器人和其它工业机械内。值此半导体技术飞速发展,微机内采用大规模集成电路作为数字集成电路的时代,液压工作者也应该跟随时代的步伐,努力利用微机控制液压系统,实现机电一体化,使液压技术 Traditional proportional valves and servo valves all control the pressure, flow and direction with electrical analogue. If you use the computer, you need to D / A converter for indirect control, so in use will be complicated. Their anti-interference ability is poor, and repeated errors and hysteresis error are large, it is difficult to achieve high-precision open-loop control. Direct digital valve can receive the microcomputer processing information, both flexible and reliable. So it is constantly replacing the analog control valve, widely used in various machine tools, robots and other industrial machinery. At this rapid development of semiconductor technology, the use of large-scale integrated circuits within the computer as an era of digital integrated circuits, hydraulic workers should follow the pace of the times, and strive to use computer-controlled hydraulic system to achieve mechanical and electrical integration, hydraulic technology