Pack of heat transfer plates

In a pack of heat transfer plates for heat exchangers, comprising:

• a plurality of mutually identical profiled plates (2,3) which are arranged in mutually contiguous relationship and which form channels for passage of a heat exchanging media, said channels extending between two mutually opposing end surfaces (4,5) of the pack (1), and in which each plate in the pack (1) has provided thereon corrugations in the form of mutually parallel S-shaped double ridges (21,22;31,32) which project symmetrically and obliquely from both opposite sides of each said plate;
• said plates (2,3) being oriented such that the double ridges of one plate intersect the double ridges of an adjacent plate, and said adjacent plates being in contact with one another solely at points of intersection (24) of said intersecting double ridges and;
• said double ridges of respective plates extending symmetrically and obliquely in mutually opposite directions relative to main flow directions (6) of the heat exchanging media flowing in the channels formed between adjacent plates;
• the improvement wherein:
• said plates (2,3) are mutually oriented such that each pair of double ridges which, as viewed in the main directions (6) of the flows of heat exchanging media, converge towards a point of intersection (24) presents a part (21) of the double ridge of one plate (2) which projects into an intermediate channel, and also a part (32) of the double ridge of the other plate (3) which projects away from said intermediate channel, so as to provide substantially equal flow of said heat exchanging media between all plates of said pack independent of the flow direction of the heat exchanging media.