Vahterus Oy

Paavo Pitkänen

Mauri Kontu

Jyrki Sonninen

Piia Gustafsson

Disclosed is a piston-cylinder assembly of a hydraulic press, which includes a basic cylinder and a first and second piston. A ring cylinder is formed above the basic cylinder as a continuation of the cylinder structure. The first piston is located inside the basic cylinder in the bottom part of the basic cylinder and the second piston is located above the first piston in the top part of the cylinder structure. The piston-cylinder assembly has a first hydraulic fluid space below the first piston and a second hydraulic fluid space below the second piston and the piston-cylinder assembly includes a unified hydraulic fluid channel in flow connection to the first hydraulic fluid space in order to provide a pressure effect in the first piston and to the second hydraulic fluid space in order to provide a pressure effect in the second piston.

Piston-cylinder assembly of a hydraulic press

The present invention relates to a method and a device for manufacturing plate part blanks for a heat exchanger. A sheet material () in the form of continuous sheeting is worked between two rolls () with opposite surface patterns () to form profiled plate part blanks (&#x2033;) into the sheet material () so that the rolls () are synchronized to rotate at substantially same rate by controlling the rotation of them in relation to each other with common synchronization gear (), which gear is coupled to the rolls () by means of shafts () with disk pack or gear couplings.

Method and device for manufacturing plate parts for a heat exchanger

The invention relates to a plate heat exchanger and a method for constructing multiple passes in the plate heat exchanger. A plate heat exchanger () according to the invention comprises at least one stopper plate () arranged between the outer surface of the plate pack () and the shell () of the outer casing of the heat exchanger for arranging multiple passes for the second heat exchange medium to the heat exchanger, wherein the stopper plate () is welded to an additional planar structure of the plate pack.

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Uusikaupunki, Finland

Paavo Pitkänen