比例阀[PROPORTIONAL VALVE]

比例阀是一种输出量与输入信号成比例的液压阀。它可以按给定的输入电信号连续地按比例地控制液流的压力、流量和方向。比例阀可以按设定的比例同时抽取几种溶液进行混合的阀门。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。

Proportional valves is a signal proportional to import and export volume of the hydraulic valves. It can be given for the importation of electrical signal proportional to the control Yeliu pressure, flow and direction. Proportional valve can be set at the same time the proportion of the valves from several solution mixed. 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.

比例阀能实现自动控制、远程控制和程序控制。比例阀能把电的快速灵活等优点与液压传动功率大等特点结合起来。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。比例阀制造简便，价格比伺服阀低廉，但比普通液压阀高。由于在输入信号与比例阀之间需设置直流比例放大器，相应增加了投资费用。比例阀使用条件、保养和维护与普通液压阀相同，抗污染性能好。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。比例阀效率比伺服阀高。主要用于开环系统，也可组成闭环系统.

Proportional valves to achieve automatic control, remote control and programmed control. Proportional valves can call the rapid and flexible, and other advantages such as large hydraulic power transmission characteristics together. 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. Proportional valves manufacture simple, low prices than servo valves, hydraulic valves than ordinary high. Because of signal proportional valves with the ratio between the need to install DC amplifier, a corresponding increase in investment costs. Proportional valves conditions of use, maintenance and preservation of hydraulic valves with the same ordinary, extraordinary good performance. 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. Proportional valves than servo valves high efficiency. For the main part of the system can be integral loop system.