BRONZE CLOSE COUPLED ROTARY GEAR PUMPS MODEL PERFORMANCE

BRONZE CLOSE COUPLED ROTARY GEAR PUMPS MODEL PERFORMANCE
MODEL
N999 SERIES
BRONZE CLOSE COUPLED
ROTARY GEAR PUMPS
MODEL N999 - 1/4” NPT PORTS STANDARD
Pump
Description
N999
Standard pump with 1/4" ports
N999R
Pump with 1/4" ports & relief valve
Pump with Viton(R)* lip seal
N999S5
N999RS5 Pump with Viton(R)* lip seal & relief valve
FEATURES
•
•
•
•
•
•
•
•
Rugged corrosion resistant bronze construction
Compact close-coupled design
Stainless steel shafts
Durable bronze spur gears
Process lubricated carbon graphite bearings
O-ring cover seal for maximum leak protection
Buna 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 mechanical seal styles - see carbonator style - model N95060
PERFORMANCE
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 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.
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 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.
GENERAL DESCRIPTION
OPTIONAL RELIEF VALVE
Pump housings and gears are made of top quality bronze, shafts are
303 stainless steel. Bearings are designed of high performance carbongraphite 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.
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.
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.
www.oberdorfer-pumps.com
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
MODEL
N999 SERIES
BRONZE CLOSE COUPLED
ROTARY GEAR PUMPS
EXPLODED VIEW AND PARTS LIST
Pump
1
2
32
4
No.
Screw
Body
O-Ring
Dowel
6 Req'd
1 Req'd
1 Req'd
2 Req'd
52
62
72
Bearing Drive Gear Idle Gear
Pin
1 Req'd
8
91,2
10
11
12
13
14
15
16
Cover
Lip
Cap
Coupling
Screw
Plug
Ball
Spring
Adj.
Seal
Plug
Assy.
Assy.
1 Req'd
1 Req'd
1 Req'd
1 Req'd 1 Req'd
Nut
1 Req'd
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 3 Req'd
N999
5013
9302NB5N 9797-033
8885
5024
32198
32199
9303NN2N
5007
9346
5604
5595
---
---
---
---
---
---
---
N999R
5013
9302NB5N 9797-033
8885
5024
32198
32199
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
DIMENSIONS
91,2
Pump No.
Lip
Repair
Kit 2
Seal
1 Req'd
N999S5
7580
12109
N999RS5
7580
12109
Adapter
Kit
Kit Number
Description
M
10562
48 Frame
N
10816
56 Frame
P
11722
S56 Frame
Q
11331
56C Frame (to ¾ HP)
F
----
11332
-----
IEC71
Adapterless- Modified 48
*Viton® or equivalent FKM will be used.
Viton® is a registered trademark of DuPont Dow Elastomers.
*Teflon® or equivalent PTFE will be used. Teflon® is a registered trademark of DuPont.
5/06
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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