BRONZE CLOSE COUPLED ROTARY GEAR PUMPS GEAR PUMPS N990 SERIES

BRONZE CLOSE COUPLED ROTARY GEAR PUMPS GEAR PUMPS N990 SERIES
GEAR PUMPS
N990 SERIES
BRONZE CLOSE COUPLED ROTARY GEAR
PUMPS
GEAR PUMPS SERIES N990
FEATURES
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Bronze Construction with Stainless Steel Shafts
Helical Gears For Quiet Operation
Easy Field Assembly to Motors
Self-Lubricating Carbon Bearings
O-Ring Seal For Max. Leak Protection
For Clutch Version See N990-38
For Air Motor Driven Version, See N990S15H-T34
DRIVE
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.
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
PERFORMANCE
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
SUCTION LIFT
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.
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
EXPLODED VIEW AND PARTS LIST
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
DIMENSIONS
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 periods. Unless otherwise specified, the pump motor unit is supplied by the
factory for shaft rotation clockwise from shaft 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 nameplate 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. *For pressures over 100 psi, the above selections are suitable for pumping fluids with lubricity (e.q. oils, polymers).
Service life will decrease for fluids without lubricity (e.q. water, solvents).
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
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