The phe gasket is fixed in the gasket groove near the edge of the plate and the hole to allow the heat exchanged liquid to flow in the respective channels. The gasket is supported by the metal on both sides in contact therewith. In order to prevent the liquid from flowing between the structural baffle and the heat exchange plate, the fixed pressure plate is used to seal the plate with four 0-rings which cannot be used for heat transfer. The blind hole plate at the end prevents the liquid from coming into contact with the movable compression plate (this is relative to a single flow). The double gasket near the hole prevents mixing of the liquid in the system, and there is a leak between the double gasket to the outside. The pressure groove can be discharged to the outside in case of leakage. Therefore, the design of the double gasket makes it possible for the plate heat exchanger to first leak out before the innermost leakage.
The weakest part of the plate heat exchanger is the gasket. The gasket does not seal the medium from leaking into the environment, and it also prevents the intermixing between the cold media. Choosing a temperature-resistant, corrosion-resistant material gasket is the key to the problem. The material is made of butyl rubber, which is suitable for working under 120~C. The coated gasket is made of a general rubber or gold nugget as a core, and is covered with a polytetrafluoroethylene or a fluorinated material, and can be used for a highly corrosive medium or to raise the temperature limit.