This paper introduced the fabrication processes of welded plate heat exchangers sandwich and shell and welding technique which adopted in the course of fabrication.

All our brazed plate heat exchangers and gasketed heat exchangers are widely used in metallurgy, food production, light industry, chemical industry, refrigeration, HVAC and other industries.

A new method, which is based on the spiral line equations, for the spiral calculation in the spiral plate heat exchangers was introduced in this paper.