Shaft seals as a differentiated class of machine elements serve to separate two functionally different installation spaces in such a way that no - or only permissible - mass transfer can take place between them. An overview of the different solutions can be found on our shaft seals page.
Seals form an extensive and widely differentiated class of machine components. Their purpose is to ensure separation between two areas which have different functions. They ensure that either no material exchange or only an allowable amount of material exchange takes place between them.
An overview of the classification of seals is shown in the figure below. Depending on the type of movement the functioning principle and examples of typical executions are provided.