短语词组短语Ball -float valve 浮球阀;翻译Hydraulic ball float valve 液压浮球阀pilot operated ball float valve 液控浮球阀Float ball valve 浮动式球阀;球阀;浮动式;浮动球阀float ball selfclosing valve 浮球式自闭阀float ball self -closing valve 浮球式自闭阀 返回 ball float valve