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.
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"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.
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.
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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.
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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.
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