Patent ID: 7424908

Claim:
A plate package for a plate heat exchanger comprising: at least two plate modules each including at least two heat exchanger plates, each of which has a primary side and a secondary side and is compression-molded to extend at at least an intermediate plane, an upper plane, and a lower plane with respect to the primary side, which planes are substantially parallel to each other, wherein the two heat exchanger plates are permanently connected to each other such that the heat exchanger plates form an inner first space between the secondary sides of the heat exchanger plates, wherein the plate modules are mounted adjacent to each other and form a second space between each other, wherein each heat exchanger plate includes a first porthole and a second porthole, which are arranged to permit communication with the first space, wherein each of the first and second portholes is defined by a port edge and surrounded by a ring groove, which is adapted to receive a gasket member and provided at the primary side at a distance from the port edge, wherein the ring groove is formed by a bottom, which is substantially positioned at the level of the intermediate plane, an inner lateral limitation that extends upwardly from the bottom in a direction towards the port edge and around the bottom and an outer lateral limitation that extends upwardly from the bottom away from the port edge and around the bottom, and wherein the outer lateral limitation forms a surface which extends without any interruptions substantially continuously around the whole bottom and the inner lateral limitation has a discontinuous extension around the bottom and includes interruptions along the extension.