Raw material supply device

摘要: A device is disclosed for supplying a glass raw material gas in the form of mixed consisting and carrier to vapor deposition producing preform an optical fiber, supply including secondary container having pressurizable interior provided adjacent main container. The bottoms, or areas near two containers are interconnected via pipe at mid portion thereof switching valve adjusting flow rate liquid between containers. Liquid level detectors one both maintain constant volume so as provide state inside operation this can easily be entirely automated.