数字伐是新近发展起来的一种能直接接受数字信号的数字式执行机构,同时又是一个能精确检测流体流量的一次元件。它随流量值的不同而改变节流比,保持节流元件二端压差不变。可以与微型计算机一起组成直接数字式流量检测系统以及对各种参数进行调节的数字控制系统。本文将介绍它的设计原理,制作结构,控制线路,控制系统及应用。 Digital logging is a newly developed digital actuator that accepts digital signals directly, as well as a primary component that accurately detects fluid flow. It changes with different flow rate throttling ratio, keeping the pressure drop across the throttle element unchanged. With the microcomputer can be composed of direct digital flow detection system and a variety of parameters to adjust the digital control system. This article will introduce its design principles, production structure, control lines, control systems and applications.