Abstract: It is an object of the present invention to provide a method for reducing crushing of grain when the grain having Vickers hardness Hv in a range of 11≦Hv≦14 is transported by means of gas. The present invention is a gas transportation method for grain having Vickers hardness Hv in a range of 11≦Hv≦14, and gas transportation is performed under the condition that a velocity V of transportation gas is set at a value in a range of 10 m/s≦V≦20 m/s. Alternatively or additionally, a blending ratio &mgr; expressed as a ratio of a flow amount of the grain (kg/H) to a flow amount of the transportation gas (kg/H) is set at a value in a range of (3 V−30)≦&mgr;≦(3 V−20).

Abstract: It is an object of the present invention to provide a method which is capable of reducing a crushing rate of grain when the grain such as rice is transported by means of gas through pipes. The temperature of the grain in a grain accommodation tank which is connected to a transportation pipe for grain is measured. A temperature signal indicating this temperature is sent to control means, which determines the temperature of transportation gas so that a difference between this temperature and the temperature of the grain is within a predetermined range. The determined temperature is transmitted to an intercooler so that the temperature of the transportation gas which is sent from a blower and flows through the transportation pipe is controlled to be at the determined specific temperature. Transportation of the grain by means of the transportation gas at this temperature prevents the grain from crushing.

Abstract: It is an object of the present invention to provide a method for reducing crushing of grain when the grain having Vickers hardness Hv in a range of 11≦Hv≦14 is transported by means of gas. The present invention is a gas transportation method for grain having Vickers hardness Hv in a range of 11≦Hv≦14, and gas transportation is performed under the condition that a velocity V of transportation gas is set at a value in a range of 10 m/s≦V≦20 m/s. Alternatively or additionally, a blending ratio &mgr; expressed as a ratio of a flow amount of the grain (kg/H) to a flow amount of the transportation gas (kg/H) is set at a value in a range of (3 V−30)≦&mgr;≦(3 V−20).

Abstract: It is an object of the present invention to provide a method which is capable of reducing a crushing rate of grain when the grain such as rice is transported by means of gas through pipes. The temperature of the grain in a grain accommodation tank which is connected to a transportation pipe for grain is measured. A temperature signal indicating this temperature is sent to control means, which determines the temperature of transportation gas so that a difference between this temperature and the temperature of the grain is within a predetermined range. The determined temperature is transmitted to an intercooler so that the temperature of the transportation gas which is sent from a blower and flows through the transportation pipe is controlled to be at the determined specific temperature. Transportation of the grain by means of the transportation gas at this temperature prevents the grain from crushing.

Abstract: A rotary valve disposed in a conveying passage for a powdery or granular material and comprising a valve casing and a valve member of arcuate cross section. In full closed position, the inner peripheral surface of the valve member is directed toward the flow of powdery or granular material to shut off the material flow, but in full open position, the valve member is rotated to permit conveyance of the powdery or granular material through an opening bored therein.