Abstract: A pneumatic pressure tank and valve system for pneumatically conveying a granular material to a destination can include a pressurizable chamber adapted to be filled with granular material through an upper inlet opening. When the chamber is filled, pressurized air is introduced into the chamber to lift a floating cone valve to a position closing the inlet opening. Pressurized air in the chamber conveys the granular material through an outlet opening toward the materials destination. The system operates on a very simple time cycle, while achieving effective use of the pressurized air for granular transport purposes.