ARO Patented Technology [Page 1 ]
As relevant today as the day it came to the 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.
ARO's "Unbalanced" air valve design makes this, and all of ARO's Diaphragm Pumps "Unstallable". Because the unbalanced valve cannot settle in a neutral position when the pump is shut down, it cannot become stuck, requiring the operator to hammer on the pump in order to start pumping again.
Anti Ice Air Valve (Below)Following closely on the heels of the pump stall-out is the infamous freezing problems 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 [Fig 1.] and pressurizes the diaphragm air chamber, the QuickDump™ operates like a normal air passage and admits air into the diaphragm's air chamber. When the main air valve is ready to exhaust [Fig 2.], the QuickDump™ diverts all of the cold/wet exhaust air coming from the diaphragm air chamber away from the main air valve, avoiding the ice formation in the critical valve passages.
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| Fig 1. | Fig 2. |
