Semi welded plate heat exchanger
Plateflow series ITT Standard

Semi-welded Plateflow design utilizes two plates laser welded together to form a cassette. The cassettes form channels within which the fluid flows. One fluid flows within the welded cassette, the other fluid between the welded cassettes. Two ring gaskets and a field gasket are used between adjacent cassettes. The ring gasket can be made of highly resistant Teflon or more traditional elastomer gasket materials. This design eliminate the welded-side's exposed gasket surface by approximately 90%.

Plate and Frame heat exchangers use a combination of chevron-style heat transfer plates sequenced between a frame plate and pressure plate. The heat transfer plates have holes at the four corners forming a header that distribute the respective flows to the opposite sides of each plate when the plates align. Semi-welded designs available in 4", 6", 8" and 12" connection sizes.