The welding and work principle of the core sheet bundle of FUNKE Flex FPF welded plate heat exchanger are the same as FUNKE Block FPB welded plate heat exchanger; the difference is that the box-type shell of this version is not fully removable. This structure design improves product design pressure and design temperature, with design pressure reaching 40bar and temperature reaching -40℃~600℃. FUNKE Flex FPF has been successfully applied in steam condensers and smoke waste heat recovery systems for power plants.