GENERAL DESCRIPTION
The ARO diaphragm pump offers high volume delivery even at low air pressure and a broad range of material compatibil- ity 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 pressure and will stop cycling once maxi- mum line pressure is reached (dispensing device closed) and will resume pumping as needed.
AIR AND LUBE REQUIREMENTS
Be sure not to use hose which might collapse..
Always 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.
Disconnect the air supply from the pump if it is to be in- active 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.
Certain ARO “Smart Parts” are indicated which should be available for fast repair and reduction of down time.
Service kits are divided to service two separate dia- phragm pump functions: 1. AIRSECTION, 2. FLUIDSEC- TION. The FLUID SECTION is divided further to match typical part MATERIAL OPTIONS.
MAINTENANCE
WARNING EXCESSIVE AIR PRESSURE. Can cause pump damage, personal injury or property damage.
A filter capable of filtering out particles larger than 50 microns should be used on the air supply. There is no lu- brication 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 the “O” rings and seals in the air motor section of the pump.
Provide a clean work surface to protect sensitive internal moving parts from contamination from dirt and foreign matter during service disassembly and reassembly.
Keep good records of service activity and include pump in preventive maintenance program.
Before disassembling, empty captured material in the outlet manifold by turning the pump upside down to drain material from the pump.
INSTALLATION
Verify correct model / configuration prior to installation.
Retorque all external fasteners per specifications prior to start up.
Pumps are tested in water at assembly. Flush pump with compatible fluid prior to installation.
When the diaphragm pump is used in a
Material supply tubing should be at least the same diam- eter as the pump inlet manifold connection.
Material supply hose must be reinforced,
Piping must be adequately supported. Do not use the pump to support the piping.
Use flexible connections (such as hose) at the suction and discharge. These connections should not be rigid piped and must be compatible with the material being pumped.
Secure the diaphragm pump legs to a suitable surface (level and flat) to insure against damage by vibration.
Pumps that need to be submersed must have both wet and
Submersed pumps must have exhaust pipe above liquid level. Exhaust hose must be conductive and grounded.
Flooded suction inlet pressure must not exceed 10 p.s.i.g. (0.69 bar).
OPERATING INSTRUCTIONS
The outlet material volume is governed not only by the air sup- ply, but also by the material supply available at the inlet. The material supply tubing should not be too small or restrictive.
FLUID SECTION DISASSEMBLY
1.Remove (61) outlet manifold and (60) inlet manifold.
2.Remove (22) balls, (19) “O” rings, (21) seats and (76) seat plugs.
3.Remove (15) fluid cap and (15a) fluid cap.
NOTE: Only PTFE diaphragm models use a primary dia- phragm (7) and a backup diaphragm (8). Refer to the auxil- iary view in the Fluid Section illustration.
4.Remove the (14) cap screw, (6) diaphragm washer, (7) dia- phragm, (5) backup washer.
NOTE: Do not scratch or mar the surface of (1) diaphragm rod.
FLUID SECTION REASSEMBLY
Reassemble in reverse order. Refer to the torque require- ments on page 5.
Clean and inspect all parts. Replace worn or damaged parts with new parts as required.
Lubricate (1) diaphragm rod and (144) “U” cups with Lu- briplate®
For models with PTFE diaphragms: Item (8) Santoprene diaphragm is installed with the side marked “AIR SIDE” to- wards the pump center body. Install the PTFE diaphragm
(7) with the side marked “FLUID SIDE” towards the (15) or (15a) fluid caps.
Apply 96998 joint sealant (approximately 27.12” long) to air cap (item 68 only) diaphragm groove. Use only 1 wrap of sealant. DO NOT overlap seam. Fill seam with heavy duty an- aerobic pipe sealant. Seam to be located between bolt posi- tion 1 and 3 (refer to “torque sequence” diagram on page 5)”.
Hytrel® and Viton® are registered trademarks of the DuPont Company Loctite® and 242® are registered trademarks of Henkel Loctite Corporation
Santoprene® is a registered trademark of Monsanto Company, licensed to Advanced Elastomer Systems, L.P. ARO® is a registered trademark of
Lubriplate® is a registered trademark of Lubriplate Division (Fiske Brothers Refining Company) 271™ is a trademark of Henkel Loctite Corporation
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