BRONZE CLOSE COUPLED ROTARY GEAR PUMPS GEAR PUMPS N992 SERIES

BRONZE CLOSE COUPLED ROTARY GEAR PUMPS GEAR PUMPS N992 SERIES
GEAR PUMPS
N992 SERIES
BRONZE CLOSE COUPLED ROTARY GEAR
PUMPS
PERFORMANCE
GEAR PUMPS SERIES N992
FEATURES
• 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
• Lip Seal or Mechanical Seal
Easy Field Assembly to a Variety of Motor Frames - For
Typical DC Motor Pump Units - see N992 DC
- 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
Bonze Pedestal Pumps - See Model N2000 For CloseCoupled Ductile Iron Pumps - See Model C992
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. See price book for the recommended liquid
temperature range of lip and mechanical seals. 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.
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 startup, 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. 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 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.
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
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
DIMENSIONS
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
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