Abstract: A plate heat exchanger comprises heat transfer plates (5) provided with port holes (2a). The plates are compression-molded relative to a reference plane and permanently joined to each other to a plate package to form heat transfer passages between adjacent heat transfer plates (5) and at least one port hole channel through the package. The plates (5), through the compression-molding, have contact portions (9) which through the permanent joining form areas of the plate package that lack any connection to the heat transfer passages. An aperture (3a) is made in each of the portions (9). Such apertures (3a) form at least one attachment member channel extending through the plate package and being adapted to receive an attachment member for attachment of the plate heat exchanger to a support member or a mounting plate.

Abstract: In a plate heat exchanger the plate interspaces form first flow passages (13, 15; 15a) for a first fluid and other flow passages (14) for a second fluid. The plates have openings which for one of the fluids form one inlet channel (10) and one outlet channel (10a) through the plate package, the channels communicating with each other through the first flow passages (13, 15; 15a). A by-pass passage (15; 15a) is formed by at least one of the first flow passages and gives a through flow resistance that is substantially smaller than that given by each one of the other (13) first flow passages. In the inlet channel (10) or the outlet channel (10a), or in both channels, a valve member (17; 18; 26) is arranged for setting of a desired flow through the by-pass passage (15; 15a).

Abstract: A permanently united plate heat exchanger normally comprises a plate package (1) having two end plates (3, 4) and several heat transferring plates (5) which are arranged therebetween. The end plates (3, 4) and the heat transferring plates (5) are permanently united, for instance by brazing, to a plate package the end plates of which have altogether four openings to form inlets and outlets for two heat exchange fluids. Two or more plate packages (1, 2) may be coupled together to form a plate heat exchanger. Preferably, plate packages of this kind are produced which have different numbers of heat transferring plates (5, 8).

Abstract: In a series of heat exchange plates (5, 6), each being rectangular with ports (7, 8, 9, 10) in its corner portions, alternate plates (6) are fully sealed and coact with intermediate plates (5) to define two groups of elongated passages through which the respective heat exchanging fluids (A, B) flow. Each intermediate plate (5) is only partially sealed and defines with one of the two adjacent fully-sealed plates (6) an area communicating directly with the atmosphere, the partial sealing consisting of port sealing means (7a, 8a, 9a, 10a) interconnecting respective pairs of opposing ports to form channels through which the two fluids (A, B) flow without entering said area. The areas form paths through which any leakage of either fluid (A, B) can escape to the atmosphere, thus preventing contamination of either fluid by the other.