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给出一个微小的电信号,电液伺服阀就有一个与之成线性比的流量输出。通常将这种元件的输出流量引向液压缸,精确地控制柱塞的位置。本文向系统设计者提供选择伺服阀的方法。文献资料中通常列出压降为1000psi 时伺服阀控制口间的有效流量。阀压降就是控制口之间的压力差,也称为负载。不要把它与系统压力混淆。阀压降可与系统压力近似,但决不会超过它,因为系统有压力损失。设计者应求出压力损失以确定阀的适用压力。阀压降△p 单位为psi,流量Q 单位为gpm,其关系式为Q=(A(△p))~(1/2)其中A 对特定的伺服阀为常量,计算如下:4=Q_(1000psI压降时)~2/1000△p-Q 曲线为抛物线,如图1所示。每个阀的曲线形状随A 值而异。应避免压力极限值。例如,在低压下压力微小变化导致很大的流量变化。其高压受伺服阀试验压力限制,并且受称作饱和压力现象的限制。要弄清这种情况下的最大流量的压力值。对于特定的阀,阀生产厂可以提
Given a small electrical signal, the electro-hydraulic servo valve has a linearly proportional flow output. The output flow of such elements is usually directed to a hydraulic cylinder to precisely control the position of the plunger. This article provides system designers with a way to choose a servo valve. The literature generally lists the effective flow rate between the servo valve control port when the pressure drop is 1000psi. Valve pressure drop is the pressure difference between the control port, also known as the load. Do not confuse it with system pressure. The valve pressure drop can approximate the system pressure, but it will never be exceeded because of the system’s pressure loss. The designer should find the pressure loss to determine the appropriate pressure on the valve. Valve pressure drop △ p unit psi, flow Q unit gpm, the relationship is Q = (A (△ p)) ~ (1/2) where A for a particular servo valve is constant, calculated as follows: 4 = Q_ (1000psI pressure drop) ~ 2/1000 △ pQ curve for the parabola, shown in Figure 1. The curve shape of each valve varies with the A value. Pressure limits should be avoided. For example, small changes in pressure at low pressure result in large flow changes. The high pressure is limited by the servo valve test pressure and is limited by the phenomenon known as saturation pressure. To find out the maximum flow pressure value in this situation. For specific valves, valve manufacturers can mention