How are balanced and unbalanced seals classified?
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Based on the effect of the medium load on the sealing surface, seals can be classified as balanced and unbalanced seals (Figure 9). Unbalanced type: Seals with a load coefficient K ≥ 1.0 are referred to as unbalanced-type seals; in other words, the increase in the specific pressure at the end faces caused by changes in the medium pressure is greater than or equal to the increase in the medium pressure itself. Balanced type: A seal with a load coefficient K < 1.0, that is, one in which the increase in the face pressure caused by changes in medium pressure is less than the increase in medium pressure itself, is referred to as a balanced-type seal.
The classification of balanced and unbalanced seals is mainly based on the effect of the medium load on the sealing surface. The characteristic of a non-equilibrium seal is that the load coefficient K ≥ 1.0, which means that the increase in the specific pressure at the end faces caused by changes in the medium pressure is greater than or equal to the increase in the medium pressure itself. For balanced seals, the load coefficient K is < 1.0, meaning that the increase in the face pressure caused by changes in the medium pressure is less than the increase in the medium pressure itself. .