Patent ID: 7677301

Claim:
An essentially rectangular heat transfer plate for plate heat exchangers, comprising: a first port portion which is located in a first edge portion at a first longitudinal end of the heat transfer plate and which comprises at least one port for each of two fluids, a second port portion which is located in a second edge portion at a second longitudinal end of the heat transfer plate and which comprises at least one port for each of the fluids, and a heat transfer portion which is located between said port portions, the ports in the first port portion being located along a first geometric line which is essentially parallel to a longitudinal direction of the plate, and the ports in the second port portion being located along a second geometric line which is essentially parallel to the longitudinal direction of the plate, wherein a flow limiter is arranged at least in the first port portion, substantially the entire length of the flow limiter being adjacent to the port which is located nearest the second port portion, the flow limiter is of such an extent that each straight geometric line, which is designed to extend between said adjacent port and a port which is located in the opposite port portion and is intended for the same fluid, extends through said flow limiter, the flow limiter is located between said adjacent port and the second port portion, the flow limiter comprises a pressed ridge which is formed integrally with the plate in a position spaced a distance along the plate from said adjacent port and which is arranged to abut against an adjoining heat transfer plate in the mounted position of the plate in a plate heat exchanger, wherein the flow limiter is arranged to define a fluid flow path between the adjacent port and the second port portion around the flow limiter, wherein the flow limiter is partly open in a region thereof closest to the second port portion to allow partial fluid flow through the flow limiter in said region; and wherein the partly open region of the flow limiter comprises one or more sections having a reduced height above the plate relative to other sections of the partly open region.