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就液压元件而言,目前已基本形成三大类即普通元件、比例元件及伺服元件互补局面。从局部看,它们虽有互相取代的可能,但就全局来看,三者会长期共存。一九六七年瑞士生产了KL比例复合阀用于船体表面去锈涂漆工艺,这标志着电液比例控制技术的诞生。一九七一年、一九七二年日本油研公司相继申请了两项(压力和流量比例阀)的专利,引起了许多国家及公司的广泛重视。一九七五年前后陆续出现了
In terms of hydraulic components, the three major categories have now basically formed the complementary components of ordinary components, proportional components and servo components. From a local perspective, although they may replace each other, they will co-exist for a long time in the overall situation. In 1967, the Swiss-made KL ratio compound valve was used to remove rust from the hull surface, marking the birth of electro-hydraulic proportional control technology. In 1972, Japan Oil Research Corporation successively applied for two patents (Pressure and Flow Proportional Valve) in 1972, arousing widespread attention in many countries and companies. One after another appeared around 1975