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广州机床研究所开发研制的由步进马达驱动的直接式数字阀四种基型已于1986年12月24日在广州通过部级技术鉴定。参加鉴定会的代表认为这四种数字阀的主要技术指标已达到80年代初期国外同类产品的水平,并为国内首创。
Guangzhou Machine Tool Research Institute developed by the stepper motor-driven direct digital valve four base type has been December 24, 1986 in Guangzhou by ministerial technical appraisal. Delegates attending the conference believe that the main technical indicators of the four digital valves have reached the level of similar products abroad in the early 1980s and are the first in China.