Plate heat exchanger

Claim 1

In the plate heat exchanger comprising paired plates each having a main heat exchanging portion, an inlet opening for a heat exchanging medium, and a distributing portion formed on one surface of the plate with furrows extending between said opening and main portion and with parallel ridges defining said furrows, the ridges and furrows on said one surface forming furrows and ridges, respectively, on the other surface of the plate, each said plate having outside its distributing portion a gasket groove partly defined by a side wall of an adjacent said ridge of the plate, said side wall merging into the bottom of the gasket groove along a continuous line, whereby a gasket situated in the groove will have a continuous support from said adjacent ridge, the ridges on one surface of one of said plates being arranged to cross and abut the ridges on the opposing surface of the other plate but extending short of supporting abutment with the bottom of the gasket groove of said other plate, the improvement wherein said adjacent ridge of each plate is provided, in its side wall remote from said gasket groove of the plate, with recesses forming extensions of the bottom of the adjacent furrow of the plate, said furrow extensions of each plate being in the direction toward the gasket groove of the plate, the furrow extensions of said other plate being aligned with regions where the bottom of said other plate''s said adjacent furrow is engaged and supported by the ridges of said one plate, said last ridges extending into abutment with said extensions of said other plate.