ABSTRACT
Sealing devices are used to stop the ¨uid from leaking. Figure 56.1 shows the main categories of the sealing devices. Static seals such as O-rings, gaskets, and packings of various forms and materials are used when the contacting component surfaces have no relative motion to each other. Readers can Ÿnd comprehensive description and discussion in Reference 1. If there is relative motion, the seal is called a dynamic seal. Dynamic seals can be grouped into two categories, based on the mode of relative motion: (1) rotating seals and (2) reciprocating seals. ˜e major classes of rotating seal designs are face seals, lip seals, circumferential seals, and labyrinth seals. Packings were also used for rotating service in earlier days, but are being replaced by face seals for lower leakage and less power consumption. Rotating seals are the topics of discussion in this chapter.
