drop gate meaning in English

升降式闸门
直接浇口

Cut - off flow technique with loose - leaf rapid - drop gate at low - head pumping stations
低扬程泵站活页式快速闸门断流技术改造措施
Research on hydraulic transients and operating system for energy - reserve rapid - drop gate of large scale pumping stations
大型泵站水力过渡过程计算及蓄能式液压启闭闸门的研究
Slowly - drop gate voltage and softly turn - off principles are explained in this article , specific parameters are also listed
摘要阐述了软降栅压和软关断的过电流保护原理，列出具体的保护时序参数。