SPX FLOW Johnson pump - Installation and Preparation for Start-up; General Installation and Location

KGE/EN (1711) 6.5 General information 15
KGE
Once all air has been evacuated, the pump starts working as a normal centrifugal pump.
A precondition for good functioning is that it should be possible for the aspirated air to
escape without back pressure in the discharge line (open valves !). The pump has a non-
return valve, so the suction and discharge lines can not be siphoned empty, when the
pump has been stopped. The remaining liquid in the pump is always sufficient for the next
suction phase.
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Figure 2: Selfpriming action
A
Water /air separation
B
Pump casing
C
Volute
D
Impeller
E
Back flow opening