GENERAL DESCRIPTION
The ARO diaphragm pump offers high volume delivery even at low air pressure and a broad range of material compatibility options available. Refer to the model and option chart. ARO pumps feature stall resistant design, modular air motor / fluid sections.
Air operated double diaphragm pumps utilize a pressure differential in the air chambers to alternately create suction and positive fluid pressure in the fluid chambers, ball checks insure a positive flow of fluid.
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 pres- sure and will stop cycling once maximum line pressure is reached (dis- pensing device closed) and will resume pumping as needed.
AIR AND LUBE REQUIREMENTS
WARNING EXCESSIVE AIR PRESSURE. Can cause pump damage, personal injury or property damage.
SA filter capable of filtering out particles larger than 50 microns 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.
SIf lubricated air is present, make sure that it is compatible with the “O” rings and seals in the air motor section of the pump.
INSTALLATION
SVerify correct model / configuration prior to installation.
SRetorque all external fasteners per specifications prior to start up.
SPumps are tested in water at assembly. Flush pump with compatible fluid prior to installation.
SWhen the diaphragm pump is used in a
SMaterial supply tubing should be at least the same diameter as the pump inlet manifold connection.
SMaterial supply hose must be reinforced,
SPiping must be adequately supported. Do not use the pump to sup- port the piping.
SUse flexible connections (such as hose) at the suction and dis- charge. These connections should not be rigid piped and must be compatible with the material being pumped.
SSecure the diaphragm pump legs to a suitable surface (level and flat) to insure against damage by vibration.
SPumps that need to be submersed must have both wet and
SSubmersed pumps must have exhaust pipe above liquid level. Ex- haust hose must be conductive and grounded.
SFlooded suction inlet pressure must not exceed 10 p.s.i.g. (0.69 bar).
OPERATING INSTRUCTIONS
SAlways flush the pump with a solvent compatible with the material being pumped if the material being pumped is subject to “setting up” when not in use for a period of time.
SDisconnect the air supply from the pump if it is to be inactive for a few hours.
PARTS AND SERVICE KITS
Refer to the part views and descriptions as provided on page 4 through 7 for parts identification and service kit information.
SCertain ARO “Smart Parts” are indicated which should be available for fast repair and reduction of down time.
SService kits are divided to service two separate diaphragm pump functions: 1. AIR SECTION, 2. FLUID SECTION. The Fluid Section is divided further to match typical part Material Options.
MAINTENANCE
SProvide a clean work surface to protect sensitive internal moving parts from contamination from dirt and foreign matter during service disassembly and reassembly.
SKeep good records of service activity and include pump in preven- tive maintenance program.
SBefore disassembling, empty captured material in the outlet man- ifold by turning the pump upside down to drain material from the pump.
FLUID SECTION DISASSEMBLY
1.Remove (61) outlet manifold, (60) inlet manifold.
2.Remove (22) balls, (19 and 33) “O” rings and (21) seats.
3.Remove (15) fluid caps.
NOTE: Only PTFE diaphragm models use a primary diaphragm (7) and a backup diaphragm (8). Refer to the auxiliary view in the Fluid Section illustration.
4.Remove the (6) diaphragm washer, (7) or (7 / 8) diaphragms, and (5) backup washer.
NOTE: Do not scratch or mar the surface of (1) diaphragm rod.
FLUID SECTION REASSEMBLY
SReassemble in reverse order. Refer to the torque requirements on page 5.
SClean and inspect all parts. Replace worn or damaged parts with new parts as required.
SLubricate (1) diaphragm rod and (144) “U” cup with LubriplateR
SFor models with PTFE diaphragms: Item (8) Santoprene diaphragm is installed with the side marked “AIR SIDE” towards the pump cen- ter body. Install the PTFE diaphragm (7) with the side marked “FLUID SIDE” towards the (15) fluid cap.
S
S VitonR and HytrelR are registered trademarks of the DuPont Company S KynarR is a registered trademark of Arkema Inc. S LoctiteR is a registered trademark of Henkel Loctite Corporation S
S SantopreneR is a registered trademark of Monsanto Company, licensed to Advanced Elastomer Systems, L.P., S LubriplateR is a registered trademark of Lubriplate Division (Fiske Brothers Refining Company) S
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