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国家标准计量局一九七六年发布过两项和液压与气动技术有关的国家标准,即: GB1235-76 O形橡胶密封圈尺寸系列(试行) G8786-76 液压及气动图形符号(代替GB786-65) 一九七七年上半年新发布的一机部标准中与液压技术有关的共164项,其中包括焊接式管接头标准30项、钢丝编织胶管接头标准17项、扩口式管接头标准40项、卡套式管接头标准48项,液压元件通用技术条件、液压元件出厂试验、液压元件型式试验等标准29项,详列于下:
National Bureau of Standards and Metrology issued two national standards related to hydraulic and pneumatic technology in 1976, namely: GB1235-76 O-ring size series (Trial) G8786-76 Hydraulic and pneumatic graphical symbols (instead of GB786- 65) A total of 164 hydraulics related issues were newly issued in the first half of 1977, including 30 standards for welded joints, 17 standards for steel braided hose joints, and standards for flared joints 40 items, 48 sets of standard pipe fittings, general technical conditions of hydraulic components, hydraulic components factory test, hydraulic components type test and other standards 29, detailed in the following: