Abstract: A plate-type heat exchanger is provided with a series of superimposed metallic plates defining a thermal exchange circuit. Each plate is provided with a peripheral groove housing a sealing gasket, said groove lying on a plane (C) placed at a different level in respect of the plane (B) on which the thermal exchange circuit lies.This feature allows the height of the thermal exchange circuit to be kept very small, e.g. 2-2.2 mm, and this enables very high thermal exchange rates between the exchanger circuits to be reached.Furthermore, the groove for housing the sealing gasket which is formed has a sufficient height for allowing the walls of the groove to be clamped by means of a clamping and squeezing machine in order to form, in the inner side of the groove, a series of projections suitable for holding firmly positioned the sealing gasket, which is on its turn provided with a series of cavities conjugated to said projections.

Abstract: A plate heat exchanger including heat exchanger plates arranged adjacent to each other and in a compressed pack, the heat exchanger plates each having openings aligned with each other and channels configured to receive a heat emitting medium and a heat absorbing medium alternately via the openings. The plate heat exchanger further includes gaskets arranged on a periphery of the openings and between two adjacent heat exchanger plates in gasket regions. The heat exchanger plates have corrugations extending from the openings in a substantially radial direction and uninterrupted through the gasket regions. Corrugations hills and corrugations troughs of adjacent heat exchanger plates cross at crossing points such that adjacent heat exchanger plates support each other at the crossing points.

Abstract: Plate heat exchanger (1) comprising a plurality of rectangular plate elements (2) and intermediary gaskets (3) held clamped in a stack (4). At least two diagonally opposed corners (7) of each plate (2) in the stack (4), comprise depressed corner areas, which are connected to the inner plate area at a concave bending line (9). The outer contour of the depressed corner area of a plate (2) in the stack (4) is in positive engagement with the inner contour of the depressed corner area of the next following plate (2) in the stack (4). This ensures alignment of the stack, both during assembly and during subsequent use.