cone valve 锥形阀coneway valve 单向阀conical seat valve 锥形座阀conical valve 锥形阀constant pressure expansion valve 恒压膨胀活门， 恒压膨胀阀constant pressure valve 恒压阀control air type reducing valve 控制空气型减压阀control air valve 控制空气阀control valve 控制阀， 调节阀控制管， 调节管。