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Stuffing Box Sealing

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Figure 6.18: Diagram of large bore seal chamber

A number of different seal chamber designs are currently in use. The
large cylindrical bore chamber shown in Figure 6.18, is the same design
as the stuffing box except that the bore diameter is larger only in the
area occupied by the seal, and the traditional close clearance is
maintained at the bottom of the chamber.

This design permits temperature or pressure control of the seal
chamber. However, it should always be used with a flush arrangement
to minimize the possibility of creating air pockets in the chamber.
The through bore chamber eliminates the close clearance at the bottom
of the chamber and opens the seal to the full effect of the conditions at
the back of the impeller.

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Figure 6.19: Diagram of through bore seal chamber

105 m