Bronze Rotary Gear Pump w/ motor
Series (30 Models):
Product Name:Bronze Rotary Gear Pump w/ motor
Oberdorfer Close coupled bronze rotary gear pumps.
- Bronze Construction with SS shaft
- Helical gears for quiet operation
- Self-lubricating carbon bearings
- O-ring seal for max. leak protection
- The pump drive shaft is connected to the motor shaft by a flexible coupling
Pump housings and gears are made of top quality bronze,
shafts are stainless steel 303. Bearings are made of high performance
carbon-graphite material selected for wear resistance and
long service life.
Gear pumps are positive displacement pumps. Each shaft revolution
displaces a definite amount of liquid relatively unaffected by
the back pressure in the discharge line. Shaft speed and flow are
Close coupled pumps are mounted directly to the electric
motor by means of a suitable adapter bracket. The pump drive shaft
is connected to the motor shaft by a flexible coupling.
LIQUIDS AND TEMPERATURE
These pumps are suitable for all liquids that are compatible
with bronze. Most common liquids are water, oil, and mild chemicals
in the pH-range of 4 to 11. Viscous liquids require reduced shaft
speeds of 1150 RPM or lower. Consult factory.
Liquids containing solids, abrasives, powders or paint pigments
are definitely not recommended for gear pumps. If abrasives
are unavoidable, use a very low shaft speed. The recommended liquid
temperature range is 32oF to 140oF for longest pump life. If more
extreme temperature conditions exist, our factory should be consulted.
Freezing of water-filled pumps can cause damage and must be
avoided. Oils at low temperatures are very viscous requiring a lower
speed or extra power.
As a general rule, the suction lift should be kept at an absolute minimum
by placing the pump as close to the liquid source as possible. A gear
pump in new condition can lift 20 feet of water in the suction line. A foot valve
(preferably with built-in strainer) is recommended at the beginning of the
suction line. For a first start-up, the pump should be primed to avoid dry running.
Minimum size of the suction pipe is the size of the pump inlet port. For
longer suction lines (over 3 feet), or for viscous liquids, the pipe size should
be at least one size or two sizes larger than the pump inlet port.
ROTATION AND RELIEF VALVE
The relief valve is not intended to be a metering or flow control device.
Its main purpose is to function as a discharge pressure relief when the spring
tension is exceeded by the discharge pressure. Overheating can occur within
5-10 minutes if the discharge line is completely shut off for extended
Unless otherwise specified, the pump motor unit is supplied by the
factory for shaft rotation clockwise from shaf t end. Reversing the motor rotation
will reverse the “in” and “out” ports and also requires changing the relief
valve location. The relief valve is always on the discharge side in this pump
series. The factory pressure setting is 50 PSIG. To increase pressure, turn
the relief valve adjusting screw in a clockwise direction.
To reverse single phase motors, find instructions on the inside of the
junction box cover or on the name plate of the motor.
Three phase motors are not wired for any particular rotation. They can
be reversed by interchanging any two (2) wires of the three (3) wire leads.
|Series||N990 Close Coupled Bronze Rotary Gear Pumps|
|Max Flow (GPM.)||23|
|Max Flow GPH||1380|
|Horse Power (HP)||1 1/2|
|Horsepower (IE .5, 1, 1.5, 20)||1.5000|
|Inlet Connection Type||FNPT|
|Outlet Connection Type||FNPT|
|Wetted Materials||304SS, Bronze|
|Phase (Ø)||Single (1)|
|Suction Lift (FT.)||20|
|Max Operating Temperature (F)||225|
|Viscosity||Glycerine 880.00 cp 5000.00 ssu|
|Mechanical Seal||BUNA LIP SEAL|
|Mechanical Seal Type||Single|
|Other||Clockwise rotation from pump end.|
|Country of Manufacture||United States|