Sealing Principle Of Rubber Seals

The sealing material is not only rubber, but also graphite, metal (mechanical seal). The type of seal is different, and the sealing effect of the rubber seal is not the same. However, in any type of sealing device, the unique elasticity and resilience of the rubber are used to seal, and are basically similar. Therefore, rubber seals are particularly useful in fluid seals.

The rubber seal is to be inserted into the groove in the stretched state, and is subjected to large elastic deformation (interference) after assembly, so that the seal cavity relies on the resilience of the rubber seal to produce the allowable sealing force within the tolerance range. . The elastic deformation of the rubber allows it to maintain its tightness under different motion conditions, even when the running surface is not concentric, which is a large deformation under low stress.

Due to the relatively high Poisson of the rubber, the rubber seal can automatically exhibit a proportional radial sealing force under the pressure of the applied axial fluid (the volume remains substantially unchanged before and after deformation). Thus, the rubber seal can be successfully installed in a relatively simple, low-precision seal cavity and is wider than the tolerances required for other seal materials.

The root cause of the rubber seal's ability to automatically excite energy under the pressure of the sealing fluid is the elasticity and resilience of the rubber. Whether it is a static seal or a dynamic seal, this precious property of rubber is indispensable.