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Features & Benefits
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ARO, Owner of the "Unstallable" Air Valve Design
As relevant today as the day it came to market, Aro is still the sole owner of the technology and the title: Unstallable. Aro uses no magnets, springs, re-set buttons, or other secondary actuators to insure pump shifting - only air.
Aro's patented "unbalanced" major air valve has constant air pressure applied to its small end. This assures that the pump resets. Competitive designs lose their signal during every shift, making them vulnerable to stalling.
To reverse the valve, air pressure is supplied to the larger end of the valve, allowing the valve to shift - note that constant air pressure continues to be applied to the small end.
"Quick Dumps" - End of the Ice Age
Following closely on the heels of pump stall-out is the infamous freezing problem inherent in most diaphragm pumps. At Aro, the ice age has been over since the introduction of our unique, enlarged "Quick Dump" ™ patented air exhaust valve, which diverts air exhaust from critical, ice-prone passages. Available on the Aro 2" (Ball & Flap) and 3" models.
When the main valve opens and pressurizes the diaphragm air chamber, the Quick Dump operates like a normal air passage and admits air into the diaphragm's air chamber.
An Air Valve That Forgives and Forgets
Aro's major air valve requires no added lubrication and the "wiping" action of the seals makes it extremely forgiving of contaminated compressed air supplies.
5 Years Between Failure
It finally happened -- a 3" ARO diaphragm pump installed to unload ceramic slip from trucks has been in service for 5 years and finally quit. After putting in a new air motor repair kit, the pump is back in service!.
The pump is still running with the original diaphragms, balls and seats.
Large Ceramic Manufacturer
Safety, Reliability and Ease of Assembly: Bolted is Better
ARO Diaphragm Pumps feature bolted construction to avoid the proven problems created by clampband type pump fasteners. These include material spills and leaks, bolt loosening and breakage due to poor joint integrity, and difficult reassembly.
Pumping 1.6 Million Gallons Without Fail
"November 11th, 1998 Frazee Industries installed an IR ARO 2" Diaphragm Pump on a trial basis at one of our most challenging locations. Because of the outstanding performance we purchased the pump.
"To date this pump has pumped approximately 1.6 million gallons of product. We have tried other brands of diaphragm pumps, but none have held up or withstood the rigorous requirements that the IR ARO pump has been exposed to.
"Frazee Industries is very pleased with the performance of the Ingersoll-Rand pumps, and is looking forward to many years of lower maintenance costs and improved production performance."
Air Operated Diaphragm Pumps Models
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ARO Diaphragm Pump Models
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Maximum Flow
GPM (LPM)
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Maximum Discharge Pressure PSI (BAR)
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Fluid Ports Inlet/outlet
(BSP Available)
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Materials of Construction
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Best Selling Models
(BSP Available)
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1/4" Ports
Non-Metallic
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4.5 (17.4)
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100 (6.8)
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3/8" (F) -In
1/4" -Out
(no BSP)
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Polypropylene Groundable Acetal
Kynar®
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PD02P-APS-PTA
PD02P-APS-PTT
PD02P-ADS-DTT
PD02P-AKS-KTT
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1/2" Ports
Non Metalic
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13(49)
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100 (6.8)
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1/2" (F) In/Out
(no BSP)
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Polypropylene Groundable Acetal
Kynar®
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66605J-388
66605J-3EB
66605J-344
66605H-244
66605K-444
66605H-2A4
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1/2" Ports
Metallic
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13(49)
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100 (6.8)
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1/2" (F) In/Out
(no BSP)
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Stainless Steel Aluminum
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PD05P-ASS-SAA
PD05P-ASS-STT
PD05P-AAS-STT
PD05P-AAS-PGG
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1" Ports
Non-Metallic
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47(178)
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120 (8.3)
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1" ANSI Flange
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Polypropylene
Kynar (PVDF)
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6661A3-3EB-C
6661A3-344-C
6661B3-344-C
6661A4-444-C
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1" Ports
Metallic 
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35 (133)
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120 (8.3)
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1" (F) - In/Out
(BSP Available)
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Aluminum
Stainless Steel
Cast Iron
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666100-322-C
666100-344-C
666101-344-C
666101-3EB-C
666111-244-C
666112-8EB-C
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1" Ports Metallic
3:1 Ratio
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24 (90.7)
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300 (20.7)
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1" (F) - In/Out
(BSP Available)
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Stainless Steel
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PH10A-ASS-SST
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1 1/2" Ports
Non-Metallic
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100 (379)
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120 (8.3)
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1 1/2" Flange
ANSI
(BSP Available)
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Polypropylene
Kynar®
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6661T3-3EB-C
6661T3-344-C
6661U3-344-C
6661U4-444-C
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1 1/2" Ports Metallic
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100 (379)
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120 (8.3)
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1 1/2" (F)
(BSP Available)
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Aluminum
Stainless Steel
Cast Iron
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666150-322-C
666150-344-C
666152-3EB-C
666151-344-C
666151-3EB-C
666161-244-C
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2" Ports Non-Metallic
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145 (548)
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120 (8.3)
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2" ANSI Flange
(BSP Available)
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Polypropylene
Kynar
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6662A3-3EB-C
6662A3-344-C
6662B3-344-C
6662B4-444-C
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2" Ports Ball Valve
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170 (644)
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120 (8.3)
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2" (F)
(BSP Available)
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Aluminum
Stainless Steel
Cast Iron
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PD20A-AAP-GGG
PD20A-AAP-KTT
PD20A-ACP-AAA
PD20A-ASP-AAA
PD20A-ASP-KTT
PD20C-ASS-KTT
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2" Ports "Flap" Valve
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170 (644)
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120 (8.3)
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2" (F)
(BSP Available)
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Aluminum
Stainless Steel
Cast Iron
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PF20A-AAP-SAA
PF20A-ACP-SAA
PF20A-ASS-SAA
PF20C-ASS-SAA
PF20A-AAP-SUA
PF20C-ASS-SVT
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3" Ports Metallic
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275 (1041)
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120 (8.3)
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3" (F)
(BSP Available)
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Aluminum
Stainless Steel
Cast Iron
Hastelloy
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PD30A-AAP-GGG-B
PD30A-AAP-KTT-B
PD30A-ACS-AAA-B
PD30A-ASS-AAA-B
PD30A-ASP-KTT-B
PD30S-ASS-STT-B
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Sanitary Transfer Tri-Clamp (S-Tran)
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1/2" = 13 (49.2)
2 1/2" = 170 (644)
3"= 275 (1041)
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120 (8.3)
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Tri-Clamp
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Stainless Steel
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PMS20S-CSS-SAA-A02
PM30S-CSS-SAA-A02
PM05P-CSS-SAA-A02
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