Page 214 - Know and Understand Centrifugal Pumps

Mechanical Seals

Figure 13-20

The face-to-face dual seal

This face-to-face double seal is quite versatile (Figure 13-21). It is
recommended in a wide range of applications depending on the piping
arrangement of its support system.
With its support system pressurized above the seal chamber pressure,
this double seal functions well with toxic and dangerous liquids (like
the back-to-back dual seal). If the support system is pressurized at '/2
the seal chamber pressure, this seal can handle higher pressures where a
single seal would fail. If the support system should be non pressurized

7

Figure 13-21

197