Because of the very large number of individual types of seal, they are first classified into simple groups on a logical basis. It is shown that the principles of operation are common to all types of seal in a group and a discussion of these basic principles leads to the formulation of requirements for the exclusion of contaminants. Contaminants likewise are grouped in sections and the sealing methods appropriate to each section are described. In conclusion, reference is made to the design compromise in which technical requirements must be weighed against space and cost limitations.
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3.
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4.
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5.
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6.
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7.
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