N999_2000

N999_2000
BRONZE CLOSE COUPLED
ROTARY GEAR PUMPS
OBERDORFER PUMPS
MODEL
N999
SERIES
A Subsidiary of Thomas Industries Inc.
MODEL N999 - 1/4” NPT PORTS STANDARD
PERFORMANCE
Pump
Description
N999
Standard pump with 1/4" ports
N999R
Pump with 1/4" ports & relief valve
N999S5
Pump with Viton(R)* seal
N999RS5 Pump with Viton(R)* seal & relief valve
FEATURES
n Compact design eases installation and use in limited space areas.
n Construction is bronze and stainless steel wetted components.
n Close tolerance design allows for consistent performance.
n Helical gears for quiet operation.
The recommended liquid temperature range is from 32 o 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.
SUCTION LIFT
GENERAL DESCRIPTION
Pump housings and gears are made of top quality bronze, shafts are 303
stainless steel. Bearings are designed 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. Recommended
pressure limits are 100 PSI for water and non-lubricants, 150 PSI for oil and other
lubricants. The maximum shaft speed is 1750 RPM.
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 builtin 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.
OPTIONAL RELIEF VALVE
SHAFT SEALS
Close coupled gear pumps are normally supplied with a Buna N lip seal. A
lip seal made of Viton(R)* is available as an option. For a Viton(R)* Seal, add S5
to the pump model number.
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 defi nitely not recommended for gear pumps. If abrasives are unavoidable, use a very
low shaft speed.
www.oberdorfer-pumps.com
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.
PHONE 800-448-1668; (315) 437-0361
FAX (315) 463-9561
MODEL
BRONZE CLOSE COUPLED
ROTARY GEAR PUMPS
OBERDORFER PUMPS
N999
SERIES
A Subsidiary of Thomas Industries Inc.
EXPLODED VIEW AND PARTS LIST
Pump
1
2
32
4
52
62
No.
Screw
Body
O-Ring
Dowel
Assy.
Assy.
6 Req'd
1 Req'd
1 Req'd
2 Req'd
1 Req'd
1 Req'd
1 Req'd
1 Req'd
Bearing Drive Gear
Pin
72
8
9 1,2
10
Idle Gear
Cover
Lip
Cap
Seal
Plug
11
12
Coupling Screw
13
14
15
16
Plug
Ball
Spring
Adj.
Nut
17
18
Locknut Bypass
Screw
Nut
19
Fiber
Washer
1 Req'd 1 Req'd 1 Req'd 1 Req'd 1 Req'd 1 Req'd 1 Req'd 1 Req'd 1 Req'd 1 Req'd 3 Req'd
N999
5506
9302NB5N 9797-033
8885
5024
32975
32974
9303NN2N
5007
9346
5604
5595
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N999R
5506
9302NB5N 9797-033
8885
5024
32975
32974
9303NN2B
5007
9346
5604
5595
1838
5803
1840
5237
5240
5239
6533
1
2
Seal # 5007 is Standard Buna N, # 7580 is Viton(R)*-Teflon(R)*
Repair Kit contains items 3, 5, 6, 7 & 9. Repair Kit for N999(R) is #10873.
VARIATIONS
Pump No.
DIMENSIONS
1,2
9
Lip
Repair
Seal
Kit
2
1 Req'd
N999S5
7580
12109
N999RS5
7580
12109
*Viton(R) or equivalent FKM will
be used.
Viton(R) is a registered trademark
of DuPont Dow Elastomers.
Teflon(R) or equivalent PTFE will
be used. Teflon(R) is a registered
trademark of DuPont.
7/00
www.oberdorfer-pumps.com
Specifications are subject to change without notice.
PHONE 800-448-1668; (315) 437-0361
FAX (315) 463-9561
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