Rotary Airlocks - Dust Collector Valve Rotolok introduced a low cost solution to dust collector valve needs. The Dust Collector Valve is a lighter duty option for standard dust collection applications. Constructed with a robust cast iron body and cast iron end covers. Bearings are inboard and shafts are sealed with lip seals. All valves are direct driven with a right angle gearbox and motor. These valves have been engineered and designed solely as a low cost alternative for applications with pressure differentials of 3 psi or less. Available in 150mm, 200mm, 250mm, and 300mm round and square inlet sizes.