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T R O U B L E S H O O T I N G G U I D E
PROBLEM
Low flow
(continued)
POSSIBLE CAUSES
Suction lift too high
Reverse rotation of motor
Pump not adequately
primed
Excessive flow
Clogged suction into filter or
screen
Air leak in the inlet piping
Reverse rotation of motor
16
REMEDIES
QSV pumps are not designed
to "lift" or "pull" fluid from a
tank. QSV pumps must be fed
with positive pressure [at
least 20 psi (1.4 bar)]. This
may be accomplished either
by having positive head from
the tank or incorporating a
transfer pump.
Make sure the motor is spin-
ning in the proper direction.
Prime the pump by filling all
inlet piping, including the
pump, with the process fluid.
Make sure your pump is oper-
ating within the flow range
specified by the pump per-
formance summary table or
the performance curve
included with the pump.
Verify no debris is clogging
the inlet screen or filter.
Fluid motion in your inlet pip-
ing may draw air into the
pump if the piping is not
sealed properly. Air bubbles
will be visible in the discharge
line.
Make sure the motor is spin-
ning in the proper direction.
Reverse two of the leads if
necessary.
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