N994_2009

N994_2009
MODEL
MODEL
N994 SERIES
N994 SERIES
BRONZE CLOSE COUPLED
ROTARY GEAR PUMPS
BRONZE CLOSE COUPLED
ROTARY GEAR PUMPS
MODEL N994 - 1/2” NPT PORTS
DIMENSIONS
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
pricebook for the recommended liquid temperature range of lip
and mechanical seals. 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
FEATURES
„ Bronze Construction with Stainless Steel Shafts
„ Helical gears for quiet operation
„ Easy Field Assembly to Motors
„ Self-Lubricating Carbon Bearings
„ O-ring seal for maximum leak protection
„ For clutch driven version, see N994-38
„ Lip or Mechanical Seal
„ For Danfoss hydrolic motor driven pump units
see N994-40
GENERAL DESCRIPTION
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 directly proportional.
*Viton(R) or equivalent FKM will be used. Viton(R) is a trademark of DuPont Dow Elastomers.
Teflon(R) or equivalent PTFE will be used. Teflon(R) is a registered trademark of DuPont.
DRIVE ARRANGEMENT
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.
Updated 08/09
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
BRONZE CLOSE COUPLED ROTARY GEAR PUMPS
MODEL N994 SERIES
PERFORMANCE
SUCTION LIFT
EXPLODED VIEW
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
* 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).
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 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.
PARTS LIST
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
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