压力比例先导阀是目前液压技术发展中出现的一种新型元件,它能根据不同的输入信号而对液压系统中的操作元件产生比例的液压力,从而使系统中的流量按比例地变化。例如:用它操纵变量油泵的伺服油缸可以按比例改变油泵排量;用它控制液控换向阀可以按比例改变系统流量。 Proportional-pressure pilot valves are a new type of element that has emerged in the development of hydraulic technology to produce proportional hydraulic forces on operating elements in a hydraulic system depending on the input signal, resulting in a proportional change in flow in the system. For example: use it to manipulate the variable pump servo cylinder can be proportionally change the pump displacement; use it to control the pilot valve can be proportionally change the system flow.