The rubber seal is a product with very good sealing performance. If the rubber seal you use has a leakage problem, you can check whether the pressure difference or concentration difference between the inner and outer sides causes the fluid to flow, and there is a gap on the sealing surface to make the fluid flow. This problem of overflow?

For different types of seals, the principle of action is different. Static sealing relies on closing the gap between the joint surfaces to achieve the sealing effect; while the dynamic seal cannot rely solely on the closed gap between the joint surfaces to achieve sealing, because the tighter the gap, the greater the frictional resistance when the mating surfaces move relative to each other, resulting in bonding Heat on the surface causes the seal to fail quickly. Therefore, the main point of the principle of dynamic sealing is to maintain the seal without generating large friction resistance, including reducing the pressure difference between the two sides of the seal and maintaining a fluid lubricating film between the joint surfaces.

Form of sealing leak

Interface leak

Insufficient gasket compression stress, rough flange sealing surface, thermal deformation, mechanical deformation, and vibration of the pipeline will cause the gasket and flange sealing surface to not fit tightly, resulting in leakage. This kind of leakage that occurs between the gasket and the flange sealing surface is called interface leakage.

Seepage, leak, leak

Non-metallic gaskets are usually made of plant fiber, animal fiber, mineral fiber or chemical fiber and rubber bonded and pressed, or made of porous rubber sealing material such as flexible graphite. Due to its loose tissue and poor compactness, there are countless tiny gaps between fibers, which are easily saturated by the medium, especially under pressure, the rubber seal medium will penetrate through the pores inside the material. This kind of leakage inside the gasket material of the rubber seal is called penetration leakage.

Therefore, the basic requirements for seals are as follows:

1. Low friction resistance and stable friction coefficient.

2. The wear is small, it can be automatically compensated to a certain extent after wear, and the working life is long.

3. Compatible with working medium.

4. Simple structure, convenient assembly and disassembly, and low price.

5. It has good sealing performance within a certain pressure and temperature range.