液控伺服阀主要是指电液伺服阀,它在接受电气模拟信号后，相应输出调制的流量和压力。它既是电液转换元件，也是功率放大元件，它能够将小功率的微弱电气输入信号转换为大功率的液压能（流量和压力）输出。在电液伺服系统中，它将电气部分与液压部分连接起来，实现电液信号的转换与液压放大。电液伺服阀是电液伺服系统控制的核心。
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