普通液壓閥只能通過預(yù)調(diào)的方式對液流的壓力、流量進行定值控制。但是當設(shè)備機構(gòu)在工作過程中要求對液壓系統(tǒng)的壓力、流量參數(shù)進行調(diào)節(jié)或連續(xù)控制，例如.要求工作臺在工作進給時按慢、快、慢連續(xù)變化的速度實現(xiàn)進給，或按一定精度模擬某個最佳控制曲線實現(xiàn)旅力控制.普通液壓閥則實現(xiàn)不了
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