cone valve 錐形閥coneway valve 單向閥conical seat valve 錐形座閥conical valve 錐形閥constant pressure expansion valve 恒壓膨脹活門， 恒壓膨脹閥constant pressure valve 恒壓閥control air type reducing valve 控制空氣型減壓閥control air valve 控制空氣閥control valve 控制閥， 調(diào)節(jié)閥控制管， 調(diào)節(jié)管。