manually operated valve meaning in English
手动操纵阀
手动阀
Examples
- Manually operated valves for natural gas dispensing systems
天然气分装系统手动控制阀 - Most are manually operated valves ( by hand ) or mechanically controlled ( pressure / vacuum or float level )
大部分为手动阀门或机械控制阀（压力/真空或浮子度） 。