Features & Benefits

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."

Frazee Paint

Air Operated Diaphragm Pumps Models

ARO Diaphragm Pump Models	Maximum Flow GPM (LPM)	Maximum Discharge Pressure PSI (BAR)	Fluid Ports Inlet/outlet (BSP Available)	Materials of Construction	Best Selling Models (BSP Available)
	4.5 (17.4)	100 (6.8)	3/8" (F) -In 1/4" -Out (no BSP)	Polypropylene Groundable Acetal Kynar?	PD02P-APS-PTA PD02P-APS-PTT PD02P-ADS-DTT PD02P-AKS-KTT
	13(49)	100 (6.8)	1/2" (F) In/Out (no BSP)	Polypropylene Groundable Acetal Kynar?	66605J-388 66605J-3EB 66605J-344 66605H-244 66605K-444 66605H-2A4
	13(49)	100 (6.8)	1/2" (F) In/Out (no BSP)	Stainless Steel Aluminum	PD05P-ASS-SAA PD05P-ASS-STT PD05P-AAS-STT PD05P-AAS-PGG
	47(178)	120 (8.3)	1" ANSI Flange	Polypropylene Kynar (PVDF)	6661A3-3EB-C 6661A3-344-C 6661B3-344-C 6661A4-444-C
	35 (133)	120 (8.3)	1" (F) - In/Out (BSP Available)	Aluminum Stainless Steel Cast Iron	666100-322-C 666100-344-C 666101-344-C 666101-3EB-C 666111-244-C 666112-8EB-C
	24 (90.7)	300 (20.7)	1" (F) - In/Out (BSP Available)	Stainless Steel	PH10A-ASS-SST
	100 (379)	120 (8.3)	1 1/2" Flange ANSI (BSP Available)	Polypropylene Kynar?	6661T3-3EB-C 6661T3-344-C 6661U3-344-C 6661U4-444-C
	100 (379)	120 (8.3)	1 1/2" (F) (BSP Available)	Aluminum Stainless Steel Cast Iron	666150-322-C 666150-344-C 666152-3EB-C 666151-344-C 666151-3EB-C 666161-244-C
	145 (548)	120 (8.3)	2" ANSI Flange (BSP Available)	Polypropylene Kynar	6662A3-3EB-C 6662A3-344-C 6662B3-344-C 6662B4-444-C
	170 (644)	120 (8.3)	2" (F) (BSP Available)	Aluminum Stainless Steel Cast Iron	PD20A-AAP-GGG PD20A-AAP-KTT PD20A-ACP-AAA PD20A-ASP-AAA PD20A-ASP-KTT PD20C-ASS-KTT
	170 (644)	120 (8.3)	2" (F) (BSP Available)	Aluminum Stainless Steel Cast Iron	PF20A-AAP-SAA PF20A-ACP-SAA PF20A-ASS-SAA PF20C-ASS-SAA PF20A-AAP-SUA PF20C-ASS-SVT
	275 (1041)	120 (8.3)	3" (F) (BSP Available)	Aluminum Stainless Steel Cast Iron Hastelloy	PD30A-AAP-GGG-B PD30A-AAP-KTT-B PD30A-ACS-AAA-B PD30A-ASS-AAA-B PD30A-ASP-KTT-B PD30S-ASS-STT-B
	1/2" = 13 (49.2) 2 1/2" = 170 (644) 3"= 275 (1041)	120 (8.3)	Tri-Clamp	Stainless Steel	PMS20S-CSS-SAA-A02 PM30S-CSS-SAA-A02 PM05P-CSS-SAA-A02