BRONZE CLOSE COUPLED ROTARY GEAR PUMPS GEAR PUMPS N993 SERIES

BRONZE CLOSE COUPLED ROTARY GEAR PUMPS GEAR PUMPS N993 SERIES
GEAR PUMPS
N993 SERIES
BRONZE CLOSE COUPLED ROTARY GEAR
PUMPS
GEAR PUMPS SERIES N993
LIQUIDS AND TEMPERATURE
FEATURES
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Rugged corrosion resistant bronze construction
Compact close-coupled design
Stainless steel shafts
Durable bronze helical gears provide quiet operation
Process lubricated carbon graphite bearings
O-ring cover seal for maximum leak protection
Nitrile Lip Seal -standard
Easy field assembly to a variety of motor frames
For compact AC motor pump units - see Close Coupled
Bronze Adapterless Rotary Gear Pumps
• For Danfoss hydraulic motor driven pump units - see
adapter 9960
• For bronze pedestal pumps and mechanical seal styles see model N3000
• For close-coupled ductile iron pumps - see model C993
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 1140 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 from
32o F to 140o F for best pump life. If more extreme
temperature conditions exist, 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. PERFORMANCE
DRIVE
Close coupled pumps are mounted directly to the electric
motor by means of suitable adapter bracket. The pump
drive shaft is connected to the motor shaft by a flexible
coupling.
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 should be at least one size or two sizes larger than the pump inlet port. 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
If the discharge line contains any throttling devices such as a shut-off valve, a spray nozzle or other restrictive device, it is
necessary to have a relief valve in the system which returns the liquid to the suction side or to the tank. The relief valve is also
available as part of the pump itself (R-model pumps). However, built-in relief valves are only good for intermittent service. If
used continuously, the pump will overheat. A built-in relief valve is strictly a safety device against overpressure. It will not work
successfully as a pressure or flow control device. For this purpose a separate relief valve in the pressure line must be used.
Unless otherwise specified, the pump motor unit is supplied by the factory for shaft rotation counterclockwise from pump shaft
end. Reversing motor will reverse “in and “out” ports and also requires changing relief valve location. The relief valve is always
on the inlet side of this pump series. The factory pressure setting is 50 PSIG. To increase pressure, turn the relief valve
adjusting screw in a clockwise direction.
SHAFT SEALS
Close coupled gear pumps are normally supplied with a Nitrile lip seal. A lip seal made of fluoroelastomer is available as an
option. For a fluoroelastomer Seal, add S5 to the pump model number. ADDITIONAL
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
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