作为压力控制元件的双级溢流阀,一般用在定量泵系统中。其作用是维持液压系统中的压力近于恒定,也可作为安全阀用来防止系统过载。溢流阀的基本工作原理是利用负反馈原理,它的控制过程类似于一个闭环伺服系统。因此,阀在工作过程中,除保证在稳态情况下具有足够的控制精度外,还必须保证具有足够的动态稳定性和良好的过渡过程品质。对于单级(直动型)溢流阀,国外的研究进行得比较充分;而对于双级溢流阀, As a pressure control element of the two-stage relief valve, generally used in the quantitative pump system. Its role is to maintain nearly constant pressure in the hydraulic system can also be used as a safety valve to prevent system overload. The basic principle of relief valve is the use of negative feedback principle, its control process is similar to a closed-loop servo system. Therefore, the valve in the work process, in addition to ensure that in the steady state with sufficient control accuracy, but also must ensure adequate dynamic stability and good quality of the transition process. For single-stage (direct acting) relief valve, foreign research carried out more fully; and for two-stage relief valve,