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MOOG伺服阀主要用作电液伺服系统的执行机构。与电动和气动执行机构相比，液压执行机构具有速度快、单位重量输出功率高、传动平稳、抗干扰能力强等优点。
伺服系统在传输信号和校正特性时，往往需要大量的电气元件。因此，现代高性能伺服系统都采用电液模式，伺服阀是该系统必不可少的组成部分。
