The flushed shaft seal is recommended for the following applications:
• With barrier steam for pumping sterilised products when reinfection must
be avoided.
• Water flushing for pumping sticky solutions or products which crystallise,
for example sugar solutions.
• Water cooling of the seal when matter may be deposited on the shaft at
the seal and burn on because of the higher temperature at the sealing
surfaces. An example is the booster pump in pasteurisers.
• Water barrier to exclude air from the product when pumping at a very
low inlet pressure, e.g. from a vacuum vessel.