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Direction of Rotation
Note: Motor shaft rotation is
viewed from the suction end of
pump. A rotational arrow is
shown on the front of the pump
volute casing. Incorrect rotation
can cause pump damage, failure
or reduced performance, voiding
warranty. It is best to check
rotation by momentarily
energizing or jogging the motor
prior to filling pump with liquid.
Warning!
Do not operate
pump without liquid for more
than a few seconds, as damage
will result to mechanical seal.
PLUMBING
All piping should be supported
independently of the pump.
Piping should not exert any
stress on the pump connections.
1. Suction Piping-Horizontal
Pumps.
Suction line must provide
adequate suction pressure and
smooth liquid flow for proper
pump operation. Air entrapment
in the suction line because of
leaks or improper design may
cause the pump to lose prime
and fail. This pump is not self-
priming, therefore the suction
must be flooded at start up.
Also, the suction line must
provide sufficient pressure and
smooth flow to pump inlet to
prevent pump cavitation. A
length of straight pipe a
minimum of 5 times the pump
Price® Pump Co. Model XJ & JB Series
21775 8th Street East w P.O. Box Q w Sonoma, CA 95476-0329 w (707) 938-8441 w Fax (707) 938-0764
inlet diameter and preferably 10
times the diameter should be
installed in the suction line
where it enters the pump.
Elbows, fittings or valves
installed close to the suction can
disrupt liquid flow and cause
malfunction. Suction lines must
be at least the same size as the
pump inlet or larger if possible.
Price Pump Company
recommends against using foot
valves in the suction line to
maintain liquid in the pump
when it's not operating. If foot
valves are used due to suction
lift conditions they must be
properly maintained to avoid
leaks resulting from wear or
fouling. Suction piping must be
designed to prevent air from
being trapped in high spots in
the piping. This condition may
cause the pump to vapor lock as
the air bubble moves into the
pump.
2. Discharge Piping.
For flow and discharge head
control it is advisable to install a
valve (globe, ball, or other
adjustable and non-leak type) in
the discharge line close to the
pump. The valve may be closed
during system repairs to prevent
backflow. By installing a check
valve in the discharge line
backflow can also be prevented
during maintenance or during
periods of pump stoppage.
Page 2 of 8
OPERATION
Priming. All centrifugal pumps
must be filled with liquid prior to
start up. For the pump
illustrated in this manual
completely fill the volute and
suction lines prior to operation.
It is suggested that during initial
start up the discharge valve be
closed and then opened as the
motor develops full rpm's. If
pump does not build up pressure
as motor speed increases, shut
down and reprime pump.
Ensure that liquid flow into
pump is not restricted (see
"Troubleshooting").
Note: A centrifugal pump's
flow and head (pressure) will
vary with the amount of
resistance (friction and flow
restrictions) in the discharge
line. As a valve on the discharge
line opens the flow and motor
amp draw will increase and head
will drop. As a valve on the
discharge is closed the flow and
amp draw will decrease and the
head will increase. If resistance
in the discharge line is not
sufficient the pump will operate
at a condition of maximum (or
"choked") flow, also sometimes
called "end of performance
curve." Maximum horsepower
is required to operate at this
point and motor overload may
result. If excessive amp draw
and motor overload is recurring,
reduce the system flow by
I&O IN164 12/14/01
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