Patent ID: 8662152

Claim:
A plate heat exchanger comprising a plurality of heat exchanger plates, arranged beside each other and connected to each other by a braze connection to form a stack of plates, the heat exchanger plates being substantially manufactured in stainless steel containing chromium, the plate heat exchanger including a number of port channels extending through at least some of the heat exchanger plates, and the plate heat exchanger further including end plates covering each end of the stack of plates and having port holes associated with the port channels, wherein at least one end plate has at least one port hole provided with a cover and said cover includes means for increasing the strength of the cover and means for sealing the at least one end plate against an adjacently arranged heat exchanger plate around a port hole extending through the adjacently arranged heat exchanger plate to prevent a fluid from flowing between the at least one end plate and the adjacently arranged heat exchanger plate, and wherein the means for increasing the strength and the means for sealing are formed by surface deviations of the cover that project in opposite directions relative to a plane passing through the at least one end plate.