READ, UNDERSTAND AND FOLLOW THIS INFORMATION TO AVOID INJURY AND PROPERTY DAMAGE.
EXCESSIVE AIR PRESSURE
STATIC SPARK
WARNING
injury, pump damage or property damage.
Do not exceed the maximum inlet air pressure as stated on
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the pump model plate.
Be sure material hoses and other components are able to
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withstand uid pressures developed by this pump. Check all
hoses for damage or wear. Be certain dispensing device is
clean and in proper working condition.
WARNING
severe injury or death. Ground pump and pumping system.
Use the pump grounding screw provided. Use ARO® part
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no. 66885-1 ground kit or connect a suitable ground wire
(12 ga. min.) to a good earth ground source.
Sparks can ignite ammable material and vapors.
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The pumping system and object being sprayed must be
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grounded when it is pumping, flushing, recirculating or
spraying flammable materials such as paints, solvents,
lacquers, etc. or used in a location where surrounding atmosphere is conducive to spontaneous combustion. Ground the
dispensing valve or device, containers, hoses and any object
to which material is being pumped.
Secure pump, connections and all contact points to avoid
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vibration and generation of contact or static spark.
Consult local building codes and electrical codes for spe-
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ci c grounding requirements.
After grounding, periodically verify continuity of electrical
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path to ground. Test with an ohmmeter from each component (e.g., hoses, pump, clamps, container, spray gun, etc.)
to ground to insure continuity. Ohmmeter should show 0.1
ohms or less.
Submerse the outlet hose end, dispensing valve or device
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in the material being dispensed if possible. (Avoid free
streaming of material being dispensed.)
Use hoses incorporating a static wire.
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Use proper ventilation.
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Keep inflammables away from heat, open flames and
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sparks.
Keep containers closed when not in use.
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WARNING
cause severe injury. Pipe exhaust away from work area and
personnel.
In the event of a diaphragm rupture, material can be forced
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out of the air exhaust mu er.
Pipe the exhaust to a safe remote location when pumping
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hazardous or in ammable materials.
Use a grounded 3/8” minimum i.d. hose between the pump
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and the mu er.
WARNING
injury or property damage. Do not service or clean pump,
hoses or dispensing valve while the system is pressurized.
Disconnect air supply line and relieve pressure from the
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system by opening dispensing valve or device and / or
carefully and slowly loosening and removing outlet hose or
piping from pump.
WARNING
jury or property damage. Do not attempt to return a pump
to the factory or service center that contains hazardous
material. Safe handling practices must comply with local
and national laws and safety code requirements.
EXCESSIVE AIR PRESSURE. Can cause personal
STATIC SPARK. Can cause explosion resulting in
Pump exhaust may contain contaminants. Can
HAZARDOUS PRESSURE. Can result in serious
HAZARDOUS MATERIALS. Can cause serious in-
HAZARDOUS MATERIALS
HAZARDOUS PRESSURE
Obtain Material Safety Data Sheets on all materials from
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the supplier for proper handling instructions.
WARNING
num parts cannot be used with 1,1,1-trichloroethane, methylene chloride or other halogenated hydrocarbon solvents
which may react and explode.
Check pump motor section, fluid caps, manifolds and all
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wetted parts to assure compatibility before using with solvents of this type.
WARNING
containing aluminum wetted parts with food products
for human consumption. Plated parts can contain trace
amounts of lead.
CAUTION
wetted parts and the substance being pumped, ushed or
recirculated. Chemical compatibility may change with temperature and concentration of the chemical(s) within the
substances being pumped, flushed or circulated. For speci c uid compatibility, consult the chemical manufacturer.
CAUTION
stress only. Certain chemicals will signi cantly reduce maximum safe operating temperature. Consult the chemical
manufacturer for chemical compatibility and temperature
limits. Refer to PUMP DATA on page 1 of this manual.
CAUTION
been trained for safe working practices, understand it’s
limitations, and wear safety goggles / equipment when required.
CAUTION
the piping system. Be certain the system components are
properly supported to prevent stress on the pump parts.
Suction and discharge connections should be exible con-
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nections (such as hose), not rigid piped, and should be compatible with the substance being pumped.
CAUTION
not allow pump to operate when out of material for long
periods of time.
Disconnect air line from pump when system sits idle for
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long periods of time.
CAUTION
sure compatible pressure rating and longest service life.
NOTICE
pump may not prime properly if the balls do not check by
gravity upon start-up.
NOTICE
of housing and gasket materials may cause fasteners to
loosen. Re-torque all fasteners to insure against uid or air
leakage.
could result in severe personal injury,
death or substantial property damage.
CAUTION
= Hazards or unsafe practices which
could result in minor personal injury,
product or property damage.
NOTICE
= Important installation, operation or
maintenance information.
Page 2 of 8 670042 (en)
Page 3
GENERAL DESCRIPTION
The ARO U.L. listed pump for pumping petroleum products, o ers
high volume delivery at low air pressures and easy self-priming.
This model is designed specifically for transfer, bulk un-loading
or fueling applications. It includes a pressure relief valve (per U. L.
Speci cation 79) which restricts the uid outlet pressure to under
50 p.s.i. (3.4 bar). The relief valve must be plumbed to return the
bleed o fuel to the storage container.
Air operated double diaphragm pumps utilize a pressure di erential in the air chambers to alternately create suction and positive
fluid pressure in the fluid chambers, ball checks insure a positive
ow of uid.
Pump cycling will begin as air pressure is applied and it will continue to pump and keep up with the demand. It will build and
maintain line pressure and will stop cycling once maximum line
pressure is reached (dispensing device closed) and will resume
pumping as needed.
AIR AND LUBE REQUIREMENTS
WARNING
age, personal injury or property damage. The air supply
must be limited to 50 p.s.i.g. (3.4 bar) maximum inlet air
pressure.
A lter capable of ltering out particles larger than 50 microns
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should be used on the air supply. There is no lubrication required other than the “O” ring lubricant which is applied during
assembly or repair.
If lubricated air is present, make sure that it is compatible with
y
the “O” rings and seals in the air motor section of the pump.
EXCESSIVE AIR PRESSURE. Can cause pump dam-
INSTALLATION
IMPORTANT
Requirements for the installation are included in the Flam-
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mable and Combustible Liquids Code, NFPA No. 30, Automotive and Marine Service Station Code, NFPA No. 30A and the
National Electric Code, ANSI / NFPA No. 70.
A fluid return hose which is compatible with the fluid being
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pumped must be installed to the relief valve on the outlet
manifold to return uid back to the supply tank or pump inlet.
The pump must be grounded to prevent static discharge.
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Grounding may be accomplished through the legs or to the
ground lug provided on the pump.
OPERATING INSTRUCTIONS
The pump should never be operated at pressures exceeding 50
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p.s.i.g. (345 kPa) inlet air pressure. This pump is equipped with a
pressure relief valve on the material outlet manifold which will
open at 40 +/-4 p.s.i. (2.76 bar) to relieve pressure increases in
the outlet hoses / plumbing caused by thermal expansion or
other external forces.
Always ush the pump with a solvent compatible with the ma-
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terial being pumped if the material being pumped is subject to
“setting up” when not in use for a period of time.
Disconnect the air supply from the pump if it is to be inactive
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for a few hours.
The outlet material volume is governed not only by the air sup-
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ply, but also by the material supply available at the inlet. The
material supply tubing should not be too small or restrictive.
Be sure not to use hose which might collapse.
When the diaphragm pump is used in a forced-feed ( ooded
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inlet) situation, it is recommended that a “check valve” be installed at the air inlet.
Secure the diaphragm pump legs to a suitable surface to insure
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against damage by vibration.
MAINTENANCE
Certain ARO “Smart Parts” are indicated which should be avail-
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able for fast repair and reduction of down time.
Provide a clean work surface to protect sensitive internal mov-
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ing parts from contamination from dirt and foreign matter during service disassembly and reassembly.
Keep good records of service activity and include the pump in
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preventive maintenance program.
Service kits are available to service two separate diaphragm
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pump functions: 1. AIR SECTION, 2. FLUID SECTION. The Fluid
Section is divided further to match typical active Material Options.
Before disassembling, empty captured material in the outlet
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manifold by turning the pump upside down to drain material
from the pump.
DIAPHRAGM PUMP SERVICE
GENERAL SERVICE NOTES:
Inspect and replace old parts with new parts as necessary. Look
y
for deep scratches on metallic surfaces, and nicks or cuts in “O”
rings.
Tools needed to complete disassembly and repair:
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7/8” socket or wrench, 1/2” socket or wrench, 3/8” socket or
y
wrench, 3/8” Allen wrench, 10 mm Allen wrench, T-10 Torx
screwdriver, torque wrench (measuring inch pounds), “O”
ring pick.
8.
diaphragm and (5) washer from (1) connecting rod. Do not mar
surface of connecting rod.
FLUID SECTION REASSEMBLY
Reassemble in reverse order.
y
Lubricate (1) connecting rod with Lubriplate® or equivalent “O”
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ring lubricant.
Connecting rod (1) should be installed using 96571 bullet, in-
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cluded in service kit.
Install (5) washers with i.d. chamfer toward diaphragm.
y
Viton® is a registered trademark of the DuPont Company y Loctite® and 242® are registered trademarks of Henkel Loctite Corporation
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Lubriplate® is a registered trademark of Lubriplate Division (Fiske Brothers Re ning Company) y ARO® is a registered trademark of Ingersoll-Rand Company
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670042 (en) Page 3 of 8
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Page 4
PARTS LIST / 670042 FLUID SECTION
637448 Fluid Section Service Kits include: 22 balls, 7 diaphragms, and item 19 (listed below) plus items 144, 174 and 94276 Lubri-
n
plate FML-2 grease (page 6).
FLUID SECTION PARTS LIST
Item Description
1 Connecting Rod(1) 96379[SS]
o
5 Diaphragm Washer(2) 94645[GFN]
6 Diaphragm Washer(2) 94622[SS]
7 Diaphragm(2) 93581-3[V]
n
12 Washer(4) 95092[A]
14 Flange Bolt
15 Fluid Cap(2) 95064[A]
19 “O” Ring
n
(size)
(5/16” - 18 x 3/4”)
(3/32” x 1-5/16” o.d.)
Qty Part No.[Mtl]
(2) 94628[SS]
(4) Y327-122[V]
Item Description
22 Ball
n
26 Flange Bolt
27 Bolt
29 Hex Flange Nut
57 Ground Kit Assembly
60 Inlet Manifold(1) 95065-1[A]
61 Outlet Manifold(1) 95066-1[A]
81 Relief Valve(1) 96333[Br]
21 Seat(4) 95727[A]
“Smart Parts”, keep these items on hand in addition to the service kit for fast repair and reduction of down time.
3.
from (135) valve block.
Remove (134) bolts, releasing (136) plug and (111) spool.
4.
MAJOR VALVE REASSEMBLY
1.
Assemble new (138 and 139) “U” cups on (111) spool - LIPS MUST FACE EACH OTHER.
2.
Assemble (137) “O” rings to (136) large plug.
3.
Insert (111) spool into (136) large plug, then insert (136) large
plug into (135) valve block, being sure the (111) spool is rotated
to accept (140) valve insert.
4.
Assemble (140) valve insert and (141) valve plate to (135) valve
block. NOTE: Assemble (140) valve insert with “dished” side
toward (141) valve plate. Assemble (141) valve plate with identi cation dot toward (132) gasket.
5
Assemble (132 and 200) gaskets, (135) valve block, (130) gasket
.
and (129) exhaust cover to (101) center body, securing with
(134) bolts. NOTE: Tighten (134) bolts to 15 - 20 in. lbs (1.7 - 2.3
Nm).
Page 6 of 8 670042 (en)
Page 7
PARTS LIST / 670042 AIR MOTOR SECTION
PILOT VALVE PARTS
123
)
103L
c
173
134
)
c
138
135
c
c
144
174
118
121
169
167
140
c
168
170
132
171
c
232
c
201129130
c
144
c
103R
123
(
c
139
c
137
Figure 4
MAJOR VALVE
141
111
136
c
200
c
250
101
118 121 174
c
173
c
PILOT VALVE PARTS
) ASSEMBLY TORQUE REQUIREMENTS (
NOTE: DO NOT OVERTIGHTEN FASTENERS.
(123) screw, 10 - 12 in. lbs (1.13 - 1.36 Nm).
(134) bolt, 15 - 20 in. lbs (1.7 - 2.3 Nm), wait 10 minutes, then re-
torque to 15 - 20 in. lbs (0.45 - 0.68 Nm).
LUBRICATION / SEALANTS
c
Apply Lubriplate FML-2 grease to all “O” rings, “U” cups and
mating parts.
670042 (en) Page 7 of 8
Page 8
TROUBLE SHOOTING
N
Product discharged from air exhaust.
Check for diaphragm rupture.
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Check tightness of (14) bolt.
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Air bubbles in product discharge.
Check connections of suction plumbing.
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Check “O” rings between intake manifold and uid caps.
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Check tightness of (14) bolt.
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Pump blows air out main exhaust when stalled on either stroke.
Check “U” cups on (111) spool in major valve.
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Check (141) valve plate and (140) insert for wear.
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Check (169) “U” cup on (167) pilot piston.
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DIMENSIONAL DATA
Dimensions shown are for reference only, they are displayed in inches and millimeters (mm).
T (air inlet)
A
Q
L
Low output volume.
Check air supply.
y
Check for plugged outlet hose.
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For the pump to prime itself, it must be mounted in the vertical
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position so that the balls will check by gravity.
Check for pump cavitation - suction pipe should be sized at
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least as large as the inlet thread diameter of the pump for
proper ow if high viscosity uids are being pumped. Suction
hose must be non-collapsible type, capable of pulling a high
vacuum.
Check all joints on the intake manifolds and suction connec-
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tions. These must be air tight.
Inspect the pump for solid objects lodged in the diaphragm
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chamber or the seat area.
(Outlet) P
E
F
G
B
D
KH
R
S
C
DIMENSIONS
A - 8-7/32” (208.5 mm)
B - 11-1/16” (280.4 mm)
C - 6-1/8” (155.5 mm)
D - 2” (50.8 mm)
E - 8-3/16” (207.9 mm)
F - 6” (152.4 mm)
G - 11-3/4” (297.9 mm)
H - 4-7/8” (123.8 mm)
J - 5-1/2” (139.6 mm)
K - 5/16” (7.9 mm)
L - 4-5/16” (109.3 mm)
M - 3/8” (9.5 mm)
N - 6-5/16” (159.9 mm)
P - 1/2 - 14 N.P.T.F. - 1
Q - 8-1/8” (206.0 mm)
M
J
(Inlet) P
R - 3-1/16” (77.8 mm)
S - 1-1/4” (31.8 mm)
T - 1/4 - 18 N.P.T.F. - 1
Figure 5
PN 97999-1196
Page 8 of 8 670042 (en)
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