Proportional valves excellent static performance and appropriate dynamic performance , dynamic performance is low compared with servo valves , but had to meet general industrial control requirements 比例阀具有优良的静态性能和适当的动态性能，动态性能虽比伺服阀低，但已经可以满足一般工业控制的要求。
The proportional valve " natural work depends on the accurate setting of the ratio amplifier . so the work parameter must be set before the running of the valve 由于比例放大器与比例阀是一一对应的关系，比例阀的正常工作很大程度上是依靠对比例放大器的准确设定，所以比例放大器中各调节指数都需要经过测试。
These valves are one kind of controllers which control pressure or flow rate continuously vary in proportion with electric input signal . they are typical mechanical , electrical and hydraulic integral products 比例阀所控制的压力或流量，是随输入电信号大小而成比例的，连续变化的控制元件，是典型的机-电-液-一体化产品。
Mainly the ljroperties of proportional valve are discussed , 3 . employing the mathematical model , computer simulation is carried out . the influence on system precision and the methods of decreasing the bad effect of the dead band are studied ?利用建立的数学模型，对系统进行了仿真，着重探讨了比例阀死区对系统精度的影响及减小其负面影响的方法。
The liquid phase is coupled device is the low voltage gradient itself in a high - pressure pumps add ratio valves in the atmosphere will be set according to the proportion of online several solvents mixed , then pump into the gas system 液相色谱中的低压梯度洗脱装置就是在高压泵之前加上一个比例阀，在常压下将几种溶剂按设定的比例在线混合之后，再泵入色谱体系。
The proportional flow valve control system with speed - electric feedback applied in hydraulic elevators can eliminate disturbances of nonlinear source such as oil temperature and load change . in this system , the proportional valve plays a key role 采用轿厢速度一电大闭环反馈控制方法的电液比例阀控系统，可以排除油温及负载变化等因素引起的非线性干扰，极大地提高了液压电梯的工作性能。
Proportional valves to continuous , proportional to the implementation of components of the control , speed and direction , pressure and can prevent or to the exchange rate changes and the impact of the phenomenon of simplified systems to reduce the usage of components 比例阀能连续地、按比例地控制执行元件的力、速度和方向，并能防止压力或速度变化及换向时的冲击现象简化了系统，减少了元件的使用量。
The dynamic performances of the force and location adjusted fashion are satisfactional . the results of theory and experiment are consistent . the results of experiment express the dynamic performances of the hyd raulic hitch are satisfactional to tractor 试验结果表明，采用比例阀的液压悬挂系统位调节和力调节都具有良好的静动态性能，并且与理论分析结果一致，因此能达到对拖拉机农具控制的静动态品质要求。
This paper presents a electrohydraulic proportional valve - control compensating synchro - system controlled by computer , introduces the hardware components and the principle of the valve - control compensating system , mainly discusses the modular design of the software in the controlling system 摘要本文设计了一种计算机控制的电液比例阀控补偿同步系统，主要介绍了阀控补偿同步系统的硬件组成和工作原理，着重介绍了系统控制软件的模块设计。
The nonlinear problem is ubiquitous and is difficult to solve in electro - hydraulic servo system . it is caused by the throttling property , because of the existing of the servo valve , proportion valve and throttling valve , by the dead band , the back lash and so on 非线性是电液伺服系统中普遍存在且至今没有很好解决的问题,这些非线性主要由电液转换和控制元件(伺服阀、比例阀或节流阀)的节流特性和液压动力机构的滞环及死区等因素引起。
