Plate heat exchanger

Abstract

To provide a plate heat exchanger free from degradation of gaskets which form a flow path through which a high-temperature fluid flows. In the plate heat exchanger, a plurality of heat transfer plateseach provided with passage holes, andin corners are stacked; a flow-path forming gasketis interposed between peripheries of each adjacent ones of the heat transfer plates; communicating-path forming gasketsare installed, surrounding the passage holesin each adjacent ones of the heat transfer platesalternately; and thereby a first flow pathadapted to pass a high-temperature fluid H, a second flow path adapted to pass a low-temperature fluid C, and communicating pathsadapted to cause the high-temperature fluid H and the low-temperature fluid C, respectively, to flow in and out of the first flow pathand the second flow pathare formed alternately on opposite sides of each of the heat transfer plates. The flow-path forming gasketis made up of an inner gasket memberand an outer gasket memberarranged in two parallel lines.