Abstract: Brazed double wall plate heat exchangers are manufactured so that the double walls are connected and sealed to each other around port holes of the exchanger. This is obtained by providing areas that are shaped so as to include areas not covering each other. The brazing is provided by capillary suction of brazing material from other plate areas.

Abstract: In manufacturing brazed, double wall plate heat exchangers the double walls (5, 6) should comprise areas (5a, 5b) connected and sealed to each other around the port holes of the exchanger. This is obtained thereby that the said areas (5a, 5b) are shaped such as to comprise areas not covering each other. The brazing is thus established by capillary suction of brazing material from other plate areas.

Abstract: A water heater adapted to avoid peak temperatures of delivered water comprises a plate heat exchanger (1) connected to a storage container (2) provided with interior reinforcing means (9-11. FIG. 1; 13-13′″. FIGS. 5-18) connecting opposite parts of the outer wall (2′) of the container (2). Even provided with a thin storage container wall this makes it possible to use a box shaped water heater design without risk of deformations due to variations in the water pressure. The reinforcing means may consist of stacked interconnected plates (13-13′″). e.g. having the same form and size as plates (12-12′″) used in a plate heat exchanger connected to the container (2).

Abstract: A container (2) adapted to avoid peak temperatures of water delivered from a heat exchanger (1) is provided with interior reinforcing means (9-11, FIG. 1; 13-13′″, FIGS. 5-18) connecting opposite parts of the wall (2′) of the container (2). Even with a thin container wall this makes it possible to use a box shaped container design without risk of deformations due to variations in the water pressure. The reinforcing means may consist of stacked interconnected plates (13-13′″)—e.g. having the same form and size as plates (12-12″) used in a plate heat exchanger connected to the container (2).

Abstract: A frame or a pressure plate (end plate) has two horizontal sides and two vertical sides and is provided with holes or recesses for fastening means used for clamping heat exchange plates between the end plates. The end plate has only one hole or recess (6a, b; 7a, b; 8a, b; 9a, b) at the upper and lower horizontal side, the hole or recess (6a; 7a; 8a; 9a) at the upper side being located on one side of the vertical center line (L) and the hole or recess (6b; 7b; 8b; 9b) at the lower side being located on the other side of the vertical center line (L). The end plate has at least one hole or one recess (10a, b) at each vertical side such that a line between the uppermost hole or recess on each side of the vertical center line forms an angle with the vertical center line, larger than 0.degree. but less than 90.degree..

Abstract: In a plate heat exchanger having a frame plate and a pressure plate, at least one of these plates has holes for flow of the heat exchanging media to and from respective passages in the pack of heat exchange plates. Each of these holes has a lining of corrosion-resistant metal comprising a hollow cylinder with thin flanges at its opposite ends engaging opposite sides of the frame plate or pressure plate. One of these flanges has a seamless connection with the hollow cylinder and is sealingly compressed between a heat exchange plate and an undepressed surface of the inner side of the adjacent frame plate or pressure plate. Lining of the hole is effected by plastically deforming a metal disc into a hollow cylinder with a flange at one end, inserting the other end of the cylinder through the hole to engage the flange with said undepressed surface, and then providing said other end of the cylinder with a flange engaging an undepressed surface of the outer side of the frame or pressure plate.