BA series pumps
Description, application and working principle 1401
1.2
Working principle of the vacuum system
The BA dry-prime centrifugal pump distinguishes itself from the normal-priming centrifugal pump
through the inclusion of a separate vacuum pump. The vacuum pump is usually driven by the drive
shaft via a belt. In special cases the vacuum pump is driven by a separate drive system, such as an
electric or hydraulic drive unit.
The vacuum pump draws the air out of the suction line and pump housing via a float chamber.
To ensure that vacuum develops in the suction line and the pump housing, a non-return valve is present
on the pressure side of the pump.
Once sufficient vacuum has developed, the pump housing fills itself with liquid and the pump begins
moving the liquid.
WARNING
To prevent damage to the pump it is important that the pump does not run dry for
more than five minutes.
The designation ‘self-priming centrifugal pump’ indicates that the pump housing does not have to be
filled before the pump is started, which is a big advantage.
The drawing below is an exploded-view of a BA dry-prime centrifugal pump. The arrows indicate the
flow of the liquid and air through the pump housing.
air:bubbles
liquid:dark arrows
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