比例压力流量复合阀简称Ｐ -Ｑ阀 ,是可用两路电信号分别控制液压系统的压力和流量的比例阀。进行流量控制时属于溢流节流调速原理 ,速度控制精度不够高 ,但与定压节流调速系统相比 ,能耗较小。近年来 ,比例压力流量复合阀在塑料注射机 ,橡胶注射机 ,压铸机 ,以及油压机等设备 Proportional pressure flow composite valve referred to as P -Q valve, is a two-way electrical signal can be used to control the pressure and flow of hydraulic system proportional valve. Flow control is the principle of overflow throttling speed control, speed control accuracy is not high enough, but compared with the constant pressure throttling speed control system, less energy consumption. In recent years, the proportion of pressure flow valve in the plastic injection molding machines, rubber injection machines, die-casting machines, and hydraulic machines and other equipment