中文摘要：

设计了一种开关先导型超高压气动减压阀．该阀设计输入压力为35MPa，输出压力为4～25MPa．采用电反馈闭环控制，主阀采用活塞式结构，先导阀由两个电磁开关阀构成．建立了系统的非线性数学模型，分析结构参数和控制参数对系统动态特性的影响，利用Matlab进行了仿真，并在测试平台上对该减压阀的特性进行了实验，得到了减压阀的特性曲线．仿真和实验结果表明，该阀在设计压力范围内具有良好的压力特性；调压腔的体积和进排气气阻是影响阀动态特性的重要因素；增大调压腔的体积或增大进排气气阻可减小输出压力振动幅度、提高输出压力精度，但系统的反应时间变长．

英文摘要：

An on/off piloted pneumatic extra-high pressure reducing valve was designed. The input pressure is up to 35 MPa, and the output pressure ranges from 4 MPa to 25 MPa. The control strategy is electric closed-loop feedback. The main valve adopts plunger-type structure. The pilot structure is composed of two extra-high pressure on/off valves. A nonlinear mathematical model of the valve was established to analyze the effects of structural parameters and controller parameters on the valve＇s dynamic characteristics, and then experiments were carried out on a pneumatic test-bed. The results showed that the valve works well under the designed pressure. The regulating chamber volume and the size of the pilot choke have the most important influence on the valve＇s dynamic characteristics, and increasing the regulating chamber volume or reducing the pilot choke size is the most effective solution to reduce the vibration amplitude and improve the accuracy of output pressure, at the price of reducing the swiftness of the system.