As we all know, the rational structural design of the PHE sealing gasket is one of the key factors to ensure that the plate heat exchanger can withstand high pressure without leakage. When the good performance of the rubber gasket received compression, the elastic deformation will occur and produce instantaneous sealing stress, but the volume does not change. If the stress is greater than the operating stress, then the seal can be maintained, and vice versa, causing leakage.

As time and temperature increase, not only will the sealing stresses loosen and decrease, but the physical properties of the rubber gasket, such as tear strength, tearing strength and hardness, will deteriorate and the life of the gasket will be shortened, and when the internal stresses exceed a certain limit, it may crack or be crushed.

Gaskets come in a variety of structural forms, which can be divided into glued type, non-adhesive type, and partial glued type.

The glued type is to glued the adhesive gasket into the adhesive gasket groove of the board, the adhesive only has the function of fixing the adhesive gasket without sealing. Traditional structure form. This is a simple structure, more solid and reliable, but the bonding process is complex, time-consuming and laborious to remove and install, and may even be affected by the adhesive and The harmful components in the cleaning agent erode the material of the adhesive gasket and the board, causing the adhesive gasket to lose its elasticity and the adhesive gasket groove to corrode and crack.

The non-adhesive type does not require adhesives, but only makes a specific structure on some corresponding parts of the adhesive tape and the board, and fixes them by mechanical methods. together, so it doesn't have the problem of adhesive corrosion of fluids and plates, saving disassembly costs and making it easy to install and replace, particularly It is suitable for frequent cleaning and conditions where the medium does not contain debris or sediment. However, the material and manufacturing requirements of the adhesive gasket are high.

The partial adhesive type is applied only on some parts of the sheet and the adhesive tape, while the other parts have a no-adhesive structure.

The structure of the non-adhesive tape can basically be divided into clip-on type and snap-on type. The "W" shaped clamping jaws are made on some parts of the outer side of the shim, which are inserted by the edge of the board on both sides, and have simple structure and processing. Not strong enough. The inserts are made with round holes or grooves in some parts of the gasket grooves and plugs or flanges in the corresponding parts of the PHE sealing gaskets that will The two are embedded together and are stronger, but are complex and more difficult to machine.