Aerodyne, a division of Abanaki Corp., says its new Vacu-Valve Armadillo closed-construction airlock valve provides positive seal under hoppers, cyclones, and dust collectors. The company says it requires no controls, lubrication, power source, or maintenance, allowing it to operate for about one-sixth the cost of a rotary airlock valve. The Armadillo’s duckbill valve design allows free-flowing continuous discharge, automatically adjusting to the desired vacuum.