| 摘要 |
PURPOSE:To make accurate metering of powder and granules possible by providing a valve having such apparent specific gravity capable of floating the valve on the powder and granules in a fluid state on the lower side of an exhaust port provided in the upper part of a metering vessel and preventing the discharging of the powder and granules. CONSTITUTION:A solenoid valve 11 is opened and the powder and granules in a hopper are fluidized by highly pressurized gas and are introduced via a packing route 7 into a metering vessel 2 from near its top and end in its tangential direction. Right after the start of packing, the powder and granules are introduced in a manner as to rotate along the inside wall, and only the gas is exhausted from an exhaust port 13. When the height of the powder and granules in the vessel rise and arrive at the height of a lightweight spherical valve body 20 consisting of a hollow rubber ball, surface-treated foamed polyethylene or the like, the valve body 20 ascends by receiving the buoyance from the powder and granules in a fluid state, thereby closing a valve seat 23. When the inflow of the gas is hampered, the valve 11 is closed. A solenoid valve 12 is then opened to fluidize the powder and granules and to deliver them out from a discharge route 3. Thereby, the leakage of the powder and granules from the port 13 is prevented and the powder and granules are accurately metered. |
