pilot valve

• From the research of the experiment and the simulation , conclusions and suggestions are gotten : ( 1 ) the fast hydraulic system which uses fast on - off valve as the pilot valves to control the logic valve is an available system
  从仿真和实验研究可得出如下结论和建议： ( 1 )本课题所研究的采用快速开关阀作先导阀控制逻辑阀的快速液压系统，是比较可行的方案。
• In chapter 3 , the design of each components of the integrated valve are introduced , which include the design of up and down main valves , pilot valves , single way valve and manual urgent descending valve and the safety valve
  第三章完成了集成阀各个功能部件的设计和计算，包括上下行主阀、上下行先导阀、单向阀、安全阀等的设计计算。对决定集成阀性能的关键参数进行了理论分析和探讨。
• There are no more descriptions to the arithmetic itself , because it is enough to use in engineering . it is the dynamic time property that is figured out so as to provides parameters for engineering design lately , compared with actual value , and analyzed the factors of influencing pilot valve
  由于该方法在工程应用上较为成熟，对算法本身没有作过多的论述，着重计算了本机构的动作时间，并与实际运动时间作了比较，同时分析了影响一级阀动作时间的因素，为以后的工程设计提供一个结构数据的参考意见。
• According to the present problems and developing tendency of hydraulic turbine governor , four main issues of this field are studied in this paper . the content include hydraulic control system , frequency measurement unit , stability of the discrete control system , optimization of control parameters and self - adjusting pid control strategy based on fuzzy logic . several main achievement and results are obtained and shown as follows : the electric - hydraulic pilot valve driven by step - motor is firstly proposed , which solves the problem that the electric - hydraulic converter of hydraulic turbine governor hydraulic servo is prone to be stuck and blocked and improves the systemic stability greatly
  本文根据水轮机调节领域存在的问题和发展趋势，对水轮机调速器的液压控制系统、频率测量环节、离散调节系统稳定性与调节参数最优整定以及适应式参数自调整pid控制策略进行了研究，得到以下主要成果和结论：首次提出了采用步进电机驱动的步进式电液引导阀，从根本上解决了水轮机调速器电液随动系统中存在的电液转换元件发卡、堵塞问题，使电液随动系统的可靠性大大提高。
• That is , through analysis of the principle on flow control and " hydraulic transistor " , design and calculation of flow control characteristic as well as main parts in valve inner chamber , a piloted reducing valve will be installed between main valve and pilot valve . after a pressure - difference compensating reducing valve was added in the non - pressure compensating piloted reducing valve of the flow control valve in vlalvistor valve , the calculation on control characteristic emulation and load characteristic emulation has been carried out . the result of the calculation shows that after pressure compensating reducing valve was added , the linearity of the control characteristics has been greatly improved thus eliminating influence upon outlet flow by load pressure - change of the hydraulic system and improving performance characteristics of the hydraulic component
  文章还在对瑞典valvistor阀的插装比例阀研究的基础上，提出了一种新的流量控制原理，即：通过对流量控制和“液压晶体管”原理的分析、流量控制特性及阀内腔主要结构件的设计计算，在主阀和导阀之间增设先导减压阀，并进一步对valvistor阀的流量控制阀之无压力补偿先导减压阀、加入压差补偿减压阀后的控制特性进行了仿真计算和负载特性仿真计算，结果表明：增设压力补偿先导增压阀后，其控制特性曲线变得非常线性，从而消除了液压系统负载压力变化对主阀输出流量的影响。
• In order to overcome the disadvantages of servo valves and the spool valves , the fast hydraulic system controlled by the fast on - off valve is researched which uses the on - off valves as the pilot valves . they are used to control the opening and closing of the logic valves , thus they can control the pressure and the flow . so they can control the movement direction and the velocity of the piston
  为了克服伺服阀和滑阀的不足，本文所研究的基于快速开关阀的快速液压系统采用快速开关阀作先导阀，控制逻辑阀的开启和关闭，从而控制液流的通断和压力的高低、流量的大小，以实现对活塞运动方向、速度的控制。