Elmo Rietschle L-BV7 - Manual (Page 49)

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Accessories
13.5 Cavitation
protection
Cavitation is understood to be the production
and sudden implosion of gas bubbles in the
liquid being fed. If the pressure in the vacuum
pump/compressor drops below the evaporation
pressure of the liquid (on the intake side or in
constricted areas), gas bubbles form. When
the pressure increases above the evaporation
pressure again (on the discharge side or at
points with a larger cross-section), these gas
bubbles collapse while forming high pressure
peaks, which may lead to particles being torn
out of the housing wall and impeller. Noise is
radiated. Material destruction of the pump-
motor unit is possible. To prevent this,
measures should be taken for cavitation
protection.
To protect the unit from cavitation, connect the
cavitation-protection hose of the liquid
separator to the connection for cavitation
protection (Fig. 7, Pg. 25, Item 4).