Abstract: A pump device and a pump unit of the pump device. The pump device includes a low-temperature flat plate group (low-temperature portion) having a plurality of flat plates as low-temperature objects arranged parallel with each other at specified intervals in a direction crossing a flow passage for a gas; a high-temperature flat plate group (high-temperature portion) having a plurality of flat plates as high-temperature objects arranged parallel with each other at specified intervals in a direction crossing the flow passage; and, a temperature-operating device operating the temperature of at least one of these flat plate groups so that a temperature difference occurs between these flat plate groups. The flat plates are displaced from each other in the flow direction of the flow passage, and a heat insulating layer is interposed between the low-temperature flat plates and the high-temperature flat plates.

Abstract: A pump apparatus comprises a low-temperature flat plate group (a low-temperature portion) C having flat plates 5 as a plurality of low-temperature bodies arranged parallel with each other with intervals in a direction crossing a passage 4 of gas, a high-temperature flat plate group (a high-temperature portion) H having flat plates 6 as a plurality of high-temperature bodies arranged parallel with each other with intervals in the direction crossing the passage 4, and temperature operation means for operating at least one of temperatures of the flat plate groups to generate temperature difference between the flat plate groups. The flat plates 5 and the flat plates 6 are displaced from each other in a flow direction in the passage 4, and a heat insulating layer interposed between the flat plates 5 and the flat plates 6.

Abstract: The present invention provides a tank, for storing chemicals, lined with chemical-resistant lining sheet at the interior surface of its metallic tank body. The tank of the present invention comprises an outer sheet with which the metallic tank body is lined at the interior surface, an inner sheet laid inside the outer sheet, and spacers disposed between the outer sheet and the inner sheet to keep a space communicating with outside of the tank. The tank of the present invention is suitably used to store chemicals which penetrate the lining sheet even though the sheet itself has no defect, depending on the type of the chemicals stored or the working conditions of the tank, for example, chemicals having high penetrability to corrode metals. Thus, the chemical in the tank can be protected from metal contamination, and the damage of the tank body can be prevented.