Most of the gaskets are cut from non-metallic plates or made by professional factories according to the specified size. The material is asbestos rubber board, asbestos board, polyethylene board. Ordinary rubber gaskets are suitable for occasions where the temperature is lower than 120℃; asbestos rubber gaskets are suitable for water vapor temperature lower than 450℃. The most common corrosive medium is acid-resistant asbestos board. The contact width between the high pressure gasket and the sealing surface is narrow (line contact), and the processing finish of the sealing surface and the gasket is high. Plate heat exchanger gaskets are divided into unilateral flow and diagonal flow according to the flow of heat exchange medium. Unilateral flow refers to the heat exchange medium that flows in from the right (left) corner hole of the heat exchange plate and then flows out from the right (left) corner hole. Diagonal flow means that the heat exchange fluid flows from the right (left) corner hole and then flows out from the left (right) corner hole, showing a diagonal flow pattern. Plate heat exchanger sealing gaskets can be divided into 3 types according to the installation method on the heat exchange plates.
(1) The direct sticking type is to apply sealant on the gasket and stick it directly into the installation groove of the heat exchange plate.
(2) The rubber nail inlay type is that the heat exchange plate is designed with assembling holes, and there are rubber nails on the side of the sealing gasket. After the sealing gasket is put into the installation groove, the rubber nails are inlaid in the assembling hole.
(3) The buckle type is to design a buckle on the side of the sealing gasket, and use the buckle to buckle the sealing gasket on the heat exchange plate. Adhesive gaskets are simple in structure and easy to process, but they are relatively troublesome to install and disassemble. Inlaid and snap-mounted gaskets have complex structures and are more troublesome to process, but they are relatively easy to install and disassemble.